CN112224034B - Energy conversion device and vehicle - Google Patents

Abstract

The application proposes an energy conversion device and a vehicle. The energy conversion device includes a motor coil of a motor, a bridge arm converter, a bus capacitor connected in parallel with the bridge arm converter, and a controller connected to the bridge arm converter. The driving power and the heating power of the motor coil, control the bridge arm converter to make the external power supply connected with the external charging and discharging port or the electric energy of the external battery flow to the driving and heating circuit, and adjust the current of the driving and heating circuit, so that the external power supply or external When the battery drives the motor to work, the motor coil consumes power and generates heat. The application only needs to control the bridge arm converter to adjust the current flowing from the external power supply or the external battery to the driving and heating circuit, so that the external power supply or the heating circuit can be realized. When the external battery-driven motor works, the motor coil consumes electricity and generates heat, which solves the problems of the prior art that the overall structure of the motor control system is complex, the integration is low, the volume is large and the cost is high.

Description

Energy conversion device and vehicle

technical field

The present application relates to the technical field of vehicles, and in particular, to an energy conversion device and a vehicle.

Background technique

In recent years, with the continuous development of electric vehicle technology, the market's acceptance of electric vehicles has been continuously improved, and battery charging and motor drive, as the core technologies in electric vehicles, have received extensive attention. At present, the battery heating circuit and the motor driving circuit in the existing electric vehicles on the market are separated. The heating circuit is used to heat the battery of the electric vehicle, and the motor driving circuit is used to drive the motor of the electric vehicle. The two circuits are different from each other. interference, independent of each other.

However, although two circuits can be used to complete the heating and motor driving process of the electric vehicle, the two circuits in the above method do not interfere with each other and are independent of each other, resulting in a complex structure of the control circuit including the heating circuit and the motor driving circuit, and the integration Low temperature, large volume and high cost.

To sum up, the prior art has the problems that the overall circuit structure of the motor control system is complex, the integration is low, the volume is large, and the cost is high.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide an energy conversion device and a vehicle to solve the problems in the prior art that the motor drive and charging system has complex overall structure, low integration, large volume and high cost.

The present application is implemented in this way. A first aspect of the present application provides an energy conversion device, which includes a motor coil of a motor, a bridge arm converter, a bus capacitor connected in parallel with the bridge arm converter, and a connection to the bridge arm converter. the controller;

the bridge arm converter is connected to the motor coil;

The motor coil, the bus capacitor and the bridge arm converter are all connected to an external charging and discharging port, and the bus capacitor is connected in parallel with an external battery;

The external charging and discharging port, the motor coil, the bridge arm converter, the bus capacitor and the battery form a driving and heating circuit;

When the energy conversion device is connected to an external power source through the external charging/discharging port, the controller controls the bridge arm converter to make all the electric motors according to the power to be driven of the motor and the power to be charged of the external battery. The electric energy of the external power source flows to the driving and heating circuits, and the currents of the driving and heating circuits are adjusted, so that the motor outputs driving power and at the same time causes the motor coils to consume electricity to generate heat.

A second aspect of the present application provides an energy conversion device, the energy conversion device comprising:

motor;

a vehicle-mounted charging module, including a charging connection terminal group, the charging connection terminal group including a first charging connection terminal and a second charging connection terminal;

a motor control module, including a bridge arm converter, the bridge arm converter is connected to the motor coil of the motor;

An energy storage module, comprising a bus capacitor connected in parallel and an energy storage connection terminal group, the bus capacitor is connected in parallel with the bridge arm converter, and the energy storage connection terminal group includes a first energy storage connection terminal, a second energy storage connection terminal connection end;

a controller, which is connected to the bridge arm converter;

The motor coil, the bridge arm converter and the bus capacitor form a driving and heating circuit;

The controller controls the bridge arm converter to make external electric energy flow to the driving and heating circuit according to the to-be-driven power of the motor and the to-be-charged power of the external battery, and adjusts the driving and heating circuit The electric current makes the motor output driving power and at the same time make the motor coils actively consume electricity and generate heat to heat the battery.

A third aspect of the present application provides a vehicle, the vehicle further comprising the energy conversion device provided in the first aspect or the energy conversion device provided in the second aspect.

This application proposes an energy conversion device and a vehicle. The energy conversion device includes a motor coil of a motor, a bridge arm converter, a bus capacitor connected in parallel with the bridge arm converter, and a controller connected to the bridge arm converter. The arm converter and the bus capacitor form the drive and heating circuit. When the energy conversion device is connected to the external power supply, the controller controls the power to be driven of the motor and the power to be heated of the motor coil to control the bridge arm converter to make the electric energy of the external power flow to drive and heat circuit, and adjust the current of the driving and heating circuits, so that the external power supply drives the motor to output the driving power while charging the battery. In the present application, the motor coil, the bridge arm converter and the bus capacitor are arranged in the energy conversion device to form the driving and heating. It only needs to control the bridge arm converter and adjust the current flowing from the external power supply to the driving and heating circuits, so that the external power supply can drive the motor to output the driving power and at the same time make the motor coil consume power and generate heat, so as to realize the use of the same system. It is used to drive the motor of the vehicle and charge the battery, with a high degree of component reuse, a high degree of system integration and a simple structure, thereby reducing the system cost, reducing the system volume, and solving the overall complex structure and integration degree of the existing motor control system. low, bulky and costly.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present application. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of an energy conversion device provided in Embodiment 1 of the present application;

2 is a circuit diagram of an energy conversion device provided in Embodiment 1 of the present application;

3 is another circuit diagram of an energy conversion device provided in Embodiment 1 of the present application;

4 is another schematic structural diagram of an energy conversion device provided in Embodiment 1 of the present application;

5 is a current waveform diagram of a driving and heating circuit of an energy conversion device provided in Embodiment 1 of the present application;

6 is another schematic structural diagram of an energy conversion device provided in Embodiment 1 of the present application;

7 is a current flow diagram of a DC power supply of an energy conversion device provided in Embodiment 1 of the present application;

8 is another current flow diagram of the DC power supply of an energy conversion device provided in Embodiment 1 of the present application;

9 is another current flow diagram of the DC power supply of an energy conversion device provided in Embodiment 1 of the present application;

10 is another current flow diagram of the DC power supply of an energy conversion device provided in Embodiment 1 of the present application;

11 is a current flow diagram of an AC power supply of an energy conversion device provided in Embodiment 1 of the present application;

12 is another current flow diagram of the AC power supply of an energy conversion device provided in Embodiment 1 of the present application;

13 is another current flow diagram of an AC power supply of an energy conversion device provided in Embodiment 1 of the present application;

14 is another current flow diagram of the AC power supply of an energy conversion device provided in Embodiment 1 of the present application;

FIG. 15 is another current flow diagram of a battery-powered energy conversion device provided in Embodiment 1 of the present application;

FIG. 16 is another current flow diagram of a battery-powered energy conversion device provided in Embodiment 1 of the present application;

FIG. 17 is another current flow diagram of a battery-powered energy conversion device provided in Embodiment 1 of the present application;

FIG. 18 is another current flow diagram of a battery-powered energy conversion device provided in Embodiment 1 of the present application;

19 is a schematic structural diagram of an energy conversion device provided in Embodiment 2 of the present application;

FIG. 20 is a schematic structural diagram of a vehicle according to Embodiment 3 of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

In order to illustrate the technical solutions of the present application, the following specific embodiments are used for description.

Embodiment 1 of the present application provides an energy conversion device. As shown in FIG. 1 , it includes a motor coil of a motor 101 , a bridge arm converter 102 , a bus capacitor 103 connected in parallel with the bridge arm converter 102 and connected to the bridge arm converter 102 . the controller 104;

The bridge arm converter 102 is connected to the motor coil;

The motor coil, the bus capacitor 103 and the bridge arm converter 102 are all connected to the external charging and discharging port 106, and the bus capacitor 103 is connected in parallel with the external battery 105;

Motor coil, bridge arm converter 102, bus capacitor 103 and forming driving and heating circuits;

According to the to-be-driven power of the motor and the to-be-heated power of the motor coil, the controller 104 controls the bridge arm converter 102 to make the electric energy of the external power source flow to the driving and heating circuits, and adjusts the currents of the driving and heating circuits, so that the external power source drives the motor output to drive the At the same time, the motor coils consume electricity and generate heat.

The motor 101 may be a synchronous motor (including a brushless synchronous motor) or an asynchronous motor, and the number of phases of the motor 101 is greater than or equal to 3 (such as a three-phase motor, a five-phase motor, a six-phase motor, a nine-phase motor, a fifteen-phase motor, etc. etc.), and the connection points of the motor coils form poles and lead out the neutral line to connect with the external power supply. The number of motor poles is the common divisor of the number of poles. The number of parallel poles of the neutral line inside the motor is determined by the use of the actual solution; the bridge arm converter 102 includes multi-phase parallel bridge arms, and the number of bridge arms in the bridge arm converter 102 is configured according to the number of phases of the motor. The phase bridge arm includes two power switch units. The power switch units can be transistors, IGBTs, MOSFET tubes, SIC tubes and other device types. The connection point of the two power switch units in the bridge arm is connected to a phase coil in the motor, and the bridge arm changes. The power switch unit in the controller 102 can be turned on and off according to the control signal of the controller 104; the external power supply can be a power supply device that provides DC power, and the power supply device can be DC power provided by a DC charging pile, or single-phase or three-phase power. The DC power output by the AC charging pile after rectification can also be the electric energy generated by the fuel cell, or the range extender, such as the rotation of the engine to drive the generator to generate electricity, and the DC power rectified by the bridge arm converter.

The controller 104 controls the bridge arm converter 102 to make the electric energy of the external power supply or the external battery 105 flow to the driving and heating circuit according to the power to be driven of the motor 101 and the power to be heated of the motor coil, which means that according to the target driving power of the motor and the current driving power of the motor to obtain the to-be-driven power of the motor, and according to the to-be-heated power of the motor coil, the to-be-heated power can be obtained by detecting the temperature of the part to be heated through the vehicle controller. For example, the part to be heated can be used for charging The battery calculates the required heating power according to the current temperature of the battery, and adjusts the on or off and on time of different power switches in the bridge arm converter 102 according to the power to be driven and the power to be heated, thereby adjusting the current flowing through the motor coil. Size and direction, the current direction of the motor coil is the direction of flowing into each phase coil in the motor or the direction of each phase coil in the motor flowing out, the current size of the motor coil refers to the size of each phase coil flowing into the motor or from each phase coil in the motor. The magnitude of the outgoing current, for example, flows from the motor coil connected to the A-phase arm of the arm inverter 102 and flows out of the motor 101 from the motor coil connected to the B-phase and C-phase arms of the arm inverter 102 , since the torque output of the motor 101 can be adjusted by adjusting the magnitude and direction of the current of each phase coil in the motor 101, and the sum of the magnitude of the current flowing through the motor 101 is equal to the input current of the connection point of each phase coil of the motor 101, the input current can be It is used to adjust the heating power. By adjusting the current size and direction of each phase coil of the motor 101 , the output torque of the external power source to drive the motor 101 and the motor coil to consume electricity to generate heat can be controlled at the same time.

The technical effect of the energy conversion device according to the embodiment of the present application is that: by arranging the motor coil, the bridge arm converter and the bus capacitor in the energy conversion device to form a driving and heating circuit, it is only necessary to control the working state of the bridge arm converter and then adjust the external The current flowing from the power supply or the external battery to the driving and heating circuit can realize the output of the driving power from the external power supply or the external battery-driven motor, and at the same time, the motor coil consumes electricity and generates heat, and then realizes the use of the same system for the vehicle's motor drive and heating. The motor coil consumes electricity to generate heat, the component reuse degree is high, the system integration degree is high, and the structure is simple, thereby reducing the system cost, reducing the system volume, and solving the existing motor control system. The overall structure is complex and the integration degree is low. , the problem of large size and high cost.

As an embodiment, the motor includes x sets of windings, wherein x≥1, and x is an integer, the number of phases of the xth set of windings is m _x phases, and each phase winding in the xth set of windings includes n _x coils Branch, the n _x coil branches of each phase winding are connected together to form a phase terminal, and one coil branch in the n _x coil branches of each phase winding in the xth set of windings is also connected with other phase windings respectively. One of the n _x coil branches in is connected to form n _x connection points, where n _x ≥ 1, m _x ≥ 2, and m _x , n _x are integers;

个连接点，

个连接点形成T个中性点，T个中性点引出N条中性线，其中：x sets of windings are formed

connection point,

The connection points form T neutral points, and the T neutral points lead to N neutral lines, where:

N的范围：T≥N≥1，且T、N均为整数。x≥1, m _x ≥2, range of T:

The range of N: T≥N≥1, and both T and N are integers.

The motor 101 is connected to a motor controller formed by a bridge arm converter 102. The bridge arm converter 102 includes K groups of M _x road bridge arms, and the first end and the second end of each bridge arm in the K group M _x road bridge arms are respectively connected in common, The midpoint of at least one bridge arm in a set of M _x bridge arms is connected to the phase end points of a set of m _x phase windings in a one-to-one correspondence, where M _x ≥ m _x , K ≥ x, and K and M _x are both integers .

Wherein, as shown in FIG. 2 , when K=1, x=1, m ₁ =M ₁ =3, the bridge arm converter 102 includes three bridge arms, the motor 101 includes three-phase windings, and each phase winding includes a phase coil In the branch circuit, each phase winding is correspondingly connected with the midpoint of one bridge arm, and the three-phase winding forms a connection point, which is the neutral point. The two ends of each bridge arm of the road bridge arm are respectively connected to form a first bus terminal and a second bus terminal, the bus capacitor C1 is connected in parallel between the first bus terminal and the second bus terminal, and the first end of the bus capacitor C1 is connected to the switch K1 The first end of the switch K2 and the first end of the switch K2, the second end of the bus capacitor C1 is connected to the first end of the switch K3, the second end of the switch K2 is connected to the first end of the resistor R, and the second end of the switch K1 is connected to the resistor R. The second terminal of the switch K3 is connected to the positive terminal of the battery 105 , and the second terminal of the switch K3 is connected to the negative terminal of the battery 105 .

Wherein, as shown in FIG. 3 , when K=1, x=2, m ₁ =3, M ₁ =6, the bridge arm converter 102 includes six bridge arms, and the motor includes two sets of three-phase windings, each set of three-phase windings. Each phase winding in the winding includes 1-phase coil branch, each phase winding is correspondingly connected to the midpoint of one bridge arm, each set of three-phase windings forms a connection point, and the 2 connection points of 2 sets of three-phase windings are connected together to form The neutral point leads out the neutral line and is connected to the external charging and discharging port 106. The two ends of each bridge arm of the three bridge arms are respectively connected to form a first confluence end and a second confluence end. The first confluence end and the third The bus capacitor C1 is connected in parallel between the two bus terminals. The first end of the bus capacitor C1 is connected to the first end of the switch K1 and the first end of the switch K2. The second end of the bus capacitor C1 is connected to the first end of the switch K3. The second terminal is connected to the first terminal of the resistor R, the second terminal of the switch K1 is connected to the second terminal of the resistor R and the positive terminal of the battery 105 , and the second terminal of the switch K3 is connected to the negative terminal of the battery 105 .

In this embodiment, by setting the number of phases of the motor windings and the number of bridge arms of the bridge arm converter, the neutral point formed by the connection points of the motor windings with different numbers in parallel leads out the neutral line, so that the equivalent phase inductance of the motor is different, and the Make the motor's neutral point have different ability to pass current. According to the demand of inductance, select an appropriate number of connection points in parallel to form the neutral point to lead out the neutral line, and obtain the required inductance to meet the power to be heated and the power to be driven.

As an embodiment, the controller 104 obtains the conduction time and duration of the bridge arm converter 102 according to the power to be driven of the motor 101 and the power to be heated of the motor coil, and adjusts the currents of the driving and heating circuits according to the conduction time and duration .

计算驱动功率；N为电机转速，Te为电机扭矩，P₁为驱动功率，再根据公式

计算目标输入电流，P为待加热功率，U₂为降压侧电容C2的目标电压。根据电机转子位置、目标输入电流以及电机扭矩输出值按照以下公式1、公式2以及公式3计算三相电机的每相电的目标电流：Among them, as an embodiment, as shown in FIG. 2, taking a three-phase motor as an example, the target voltage of the buck-side capacitor C2 is obtained, the current voltage of the battery is obtained, and the charging is obtained by communicating with an external power supply (charging pile) The highest output voltage of the pile, the target voltage of the step-down capacitor is the minimum value of the current voltage of the power battery and the highest output voltage of the charging pile, and the target input of the three-phase motor is calculated according to the heating power, motor torque output value and target voltage. Current, the drive power is calculated according to the motor torque output value, which can be calculated according to the formula

Calculate the driving power; N is the motor speed, Te is the motor torque, P ₁ is the driving power, and then according to the formula

Calculate the target input current, P is the power to be heated, and U ₂ is the target voltage of the step-down capacitor C2. According to the motor rotor position, the target input current and the motor torque output value, the target current of each phase of the three-phase motor is calculated according to the following formulas 1, 2 and 3:

Formula 1:

Formula 2: IA+IB+IC=I

Formula 3: P=(IA×IA+IB×IB+IC×IC)×R

Among them, α is the rotor electrical angle, IA, IB, IC are the target current of each phase of the three-phase motor, I is the target input current, Te is the motor torque output value, λ, ρ, L _d , L _q are the motor parameters , P is the heating power, and R is the equivalent impedance of the three-phase motor.

Among them, according to formula 1, formula 2, formula 3, the target currents IA, IB, and IC of each phase of the three-phase motor can be obtained.

According to the target voltage of the buck side capacitor, the target input current and the voltage of the power battery, the average duty cycle of the three-phase electrical control pulse is obtained by the following formula:

Formula 4: U ₂ =U ₁ ×D ₀ -I×R, where U ₂ is the target voltage of the buck-side capacitor, U ₁ is the voltage of the power battery, and D ₀ is the average duty cycle of the three-phase electrical control pulse , I is the target input current, and R is the equivalent impedance of the three-phase motor.

Among them, U ₁ ×D ₀ is the voltage across the three-phase inverter, and I×R is the voltage drop across the three-phase motor. According to the voltage across the three-phase inverter, it is equal to the voltage drop across the three-phase motor and the voltage drop. The sum of the target voltages of the side capacitances yields the above formula.

According to the average duty cycle, the target input current, the target current of each phase, and the voltage of the power battery, the first target duty cycle of the control pulse of each phase bridge arm is obtained according to the following formula:

Formula 5:

Among them, I ₁ is the target current of each phase of electricity, R ₁ is the equivalent impedance of each phase coil, and D ₁ is the target duty cycle of the control pulse of each phase bridge arm.

Among them, when the flow direction of the current in the winding coil is from the connection point of each phase bridge arm and each phase coil to the step-down side capacitor, the voltage of the connection point of each phase bridge arm and each phase coil is greater than the voltage of the step-down side capacitor. , the voltage of the connection point between the bridge arm of each phase and the coil of each phase is equal to the sum of the voltage drop on the phase coil and the target voltage of the capacitor on the step-down side, that is, U ₁ ×D ₁ =R ₁ ×I ₁ +U ₂ , when The direction of current flow in the winding coil is from the capacitor on the step-down side to the connection point between the bridge arm of each phase and the coil of each phase. The voltage of the connection point between the bridge arm and each phase coil is equal to the difference between the target voltage of the step-down capacitor and the voltage drop on the phase coil, that is, U ₁ ×D ₁ =U ₂ -R ₁ ×I ₁ , combined with the above formula 4 to obtain formula 5, that is, to obtain the target duty cycle of the control pulse of each phase bridge arm.

Among them, the current vector position is obtained according to the motor torque output value, and then the phase relationship of the three-phase current is obtained, the conduction time of the bridge arm converter is obtained according to the phase of each phase current, and the target duty cycle of the control pulse of each phase arm is obtained. The on-time of the bridge-leg converter.

Compared with the independent implementation of motor coil heating or motor drive control in this embodiment, by increasing the on-time of the control bridge arm converter, and by adjusting the current flowing from the external power supply or the external battery to the driving and heating circuits, the external power supply or the external battery can be controlled. The battery-driven motor outputs driving power while making the motor coils consume electricity to generate heat.

As an embodiment, when the external charging and discharging port is connected to an external power source and the external power source is a DC power supply device, the working cycle of the driving and heating circuit includes a first working stage and a second working stage; the motor coil includes a first coil and a The second coil, the bridge arm converter 102 includes a first bridge arm connected to the first coil and a second bridge arm connected to the second coil.

In the first working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the to-be-driven power of the motor and the to-be-heated power of the motor coil, so that the electric energy of the DC power supply device passes through the first coil and the second bridge arm. The first bridge arm then flows back to the DC power supply device, and at the same time, the electrical energy on the bus capacitor 103 flows back to the bus capacitor 103 through the second bridge arm, the second coil, the first coil and the first bridge arm.

In the second working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, and the electric energy of the DC power supply device flows through the battery 105 and the bus capacitor 103 after passing through the first coil and the first bridge arm. The electric energy flows back to the DC power supply device, and at the same time, the electric energy forms a circulating current among the second coil, the first coil, the first bridge arm and the second bridge arm.

Wherein, in the first working stage, the first coil is a one-phase coil or a coil with at least two phases connected together, the first bridge arm is one bridge arm or at least two bridge arms connected in parallel, and one of the first coils The phase coil is connected with one bridge arm in the first bridge arm, the second coil is a one-phase coil or a coil with at least two phases connected together, the second bridge arm is one bridge arm or at least two bridge arms connected in parallel, the first One phase coil in the second coil is connected to one bridge arm in the second bridge arm. The difference between the first coil and the second coil is that the currents of the two coils are in opposite states. For example, the control of the bridge arm converter 102 The first bridge arm makes the current in the first coil flow in a first direction, and the first direction can be from the motor to the bridge arm converter 102, and the second bridge arm of the bridge arm converter 102 is controlled to make the second coil flow. The direction of the current is to flow in the second direction, and the second direction can be from the bridge arm converter 102 to the motor, that is, there are currents flowing in different directions in the motor coils in the first working stage at the same time. Controls and causes the motor coils to consume electricity to generate heat.

It should be noted that the coils in the first coil and the second coil are not fixed, the first coil and the second coil are changed at any time according to the current direction, and the power switch of the bridge arm connected to the coil can be selected for control, for example, The motor includes a first-phase coil L1, a second-phase coil L2 and a third-phase coil L3, and the lower arm of the bridge arm connected to the first-phase coil L1 is controlled to be turned on so that the current in the first-phase coil L1 flows from the motor. The coil-to-bridge converter 102 controls the conduction of the upper bridge arm of the bridge arm connected to the second-phase coil L2 and the third-phase coil L3 so that the current in the second-phase coil L2 and the third-phase coil L3 flows from the bridge. The arm inverter 102 is connected to the motor coil. At this time, the first coil is the first-phase coil L1, the second coil is the second-phase coil L2 and the third-phase coil L3. In the next cycle, by changing the conduction in the bridge arm The power switch can change the direction of the current in the motor coil, and the first coil can be the first phase coil L1 and the second phase coil L2, and the second coil can be the third phase coil L3.

Among them, in the first working stage, the electric energy of the DC power supply device is made to flow back to the DC power supply device after passing through the first coil and the first bridge arm, so as to realize the storage of the electric energy of the DC power supply device in the first coil, that is, to realize the DC power supply During the driving process of the device to the motor and the energy storage process during the heating process of the motor coil, since there is current flowing through the first coil during the energy storage process, the motor 101 can be driven to run and the first coil can generate heat at this time. The electric energy on the bus capacitor 103 in the stage flows back to the bus capacitor 103 after passing through the second bridge arm, the second coil, the first coil and the first bridge arm, so that the bus capacitor 103 can communicate with the first bridge arm converter 102 to the first bridge arm. The coil and the second coil are discharged. Since the first coil and the second coil are connected together, the directions of the current flowing in the first coil and the second coil are different, which can realize the energy storage of the first coil in the DC power supply device. The motor 101 is continuously driven and the first coil and the second coil generate heat at the same time.

Among them, since the first working stage and the second working stage constitute a cycle, since the cycle is a fixed value, when the conduction time and length of the first bridge arm and the second bridge arm in the first working stage are determined, the second working stage The conduction time and duration of the first bridge arm and the second bridge arm in the stage can be directly determined.

Among them, the electric energy of the DC power supply equipment in the second working stage passes through the first coil and the first bridge arm, flows through the bus capacitor 103 and flows back to the DC power supply equipment, for realizing the DC power supply equipment and the first coil to the busbar capacitor 103 Charging, that is, to realize the driving process of the DC power supply device to the motor and the freewheeling charging process during the heating process of the motor coil, the electric energy in the second working stage is in the second coil, the first coil, the first bridge arm and the second bridge arm. A circulating current is formed between the two coils, which is used to make the current in the second coil flow to the first coil, because during the first working process, the current output by the bus capacitor 103 flows through the second coil through the second bridge arm, and then flows through the second coil. and the first coil to increase the voltage of the connection point between the second coil and the second bridge arm, which is determined by the relationship between the voltage of the capacitor on the charging and discharging port side and the voltage of the connection point between the coil and the second bridge arm. The direction of current flow, if the voltage of the connection point between the second coil and the second bridge arm is greater than the voltage of the capacitor on the charging and discharging port side, the winding current direction is to flow from the connection point between the second coil and the second bridge arm, Therefore, it is possible to realize that the current in the second coil flows to the first coil. Since the first coil and the second coil are connected together, the directions of the current flowing through the first coil and the second coil are different. The first coil charges the battery 105 and the bus capacitor 103 while driving the motor 101 and generating heat in the first and second coils.

Among them, as shown in FIG. 5, the current waveform diagram of one phase of the motor 101 during the cooperative control of heating and driving, the bridge arm converter 102 outputs the current to the motor terminal, and the direction of the current flowing into the motor phase winding is the positive direction. As can be seen in Fig. 5, the current of each phase of the motor 101 is superimposed with a negative DC component on the basis of the sine wave; the negative DC component is the average current flowing into each phase of the motor from the external power supply in each cycle, and the energy output by the external power supply It is greater than the energy consumed by the drive, and the remaining energy is the energy for heating the motor coil.

In this embodiment, the working cycle of the driving and heating circuit is divided into a first working stage and a second working stage. Each working stage includes the heating process of the motor coil power consumption and the driving process of the motor. By controlling the first bridge arm and the turn-on time and duration of the second bridge arm, respectively, adjust the current of the driving and heating circuits in the first working stage and the second working stage, so that part of the energy output by the DC power supply equipment in the entire working cycle is used for the consumption of electricity through the motor coil. Electric heat dissipation, part of which drives the motor, realizes the coordinated work of making the motor coil consume electricity to generate heat and driving the motor.

As an embodiment, before the duty cycle of the driving and heating circuit, it also includes a start-up period of the driving and heating circuit;

The start-up cycle of the drive and heating circuits includes a first start-up phase and a second start-up phase;

In the first start-up stage, the controller 104 controls the conduction time and length of the first bridge arm and the second bridge arm according to the power to be driven of the motor 101 and the power to be heated of the motor coil, so that the electric energy of the DC power supply device passes through the first coil and the second bridge arm. After the first bridge arm, it flows back to the DC power supply equipment;

In the second start-up stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, so that the electric energy of the DC power supply device flows through the bus capacitor 103 and back to the first coil and the first bridge arm after passing through the first coil and the first bridge arm. DC powered equipment.

Among them, the work cycle of the driving and heating circuit also includes a start-up cycle. The start-up cycle only works when the power is turned on. After the start-up cycle completes the start-up of the work cycle, it will no longer work. The bus capacitor 103 is charged, and in the first startup stage of the startup cycle, the DC power supply equipment is used to store energy in the first coil, and in the second startup stage, the DC power supply equipment and the first coil are used to charge the bus capacitor 103 to ensure that the bus A high voltage is formed on the busbars on both sides of the capacitor 103. When the working cycle starts, the busbar capacitor 103 discharges the motor coil through the bridge arm converter 102, and then charges the busbar capacitor 103 through the DC power supply device and the first coil, so that the The duty cycle can work cyclically. In addition, the first coil in the start-up cycle can be all coils in addition to some of the motor coils. For example, when the motor 101 is a three-phase motor, the three-phase bridge arm power switch can be selected at the same time. Control, that is, in the first start-up stage, the three-phase upper arms can be turned off at the same time, and the three-phase lower arms can be turned on at the same time; in the second start-up stage, the three-phase upper arms can be turned on at the same time, and the three-phase lower arms can be turned off at the same time. break.

In this embodiment, the start-up period is set when the DC power supply device is connected, the bus capacitor is charged through the start-up period when the power is turned on, and the first stage of the work cycle is started by the bus-bar capacitor at the beginning of the work period, so that the normal work cycle is realized. Start and cycle work.

As an embodiment, as shown in FIG. 6 , the energy conversion device further includes a bidirectional bridge arm 107 , the external charging and discharging port 106 further includes an AC charging port 108 , the bidirectional bridge arm 107 is connected in parallel with the bridge arm converter 102 , and the bidirectional bridge arm 107 is also connected to the controller 104 and the AC charging port, the AC charging port is connected to the AC power supply equipment, the working cycle of the driving and heating circuit includes the third working stage and the fourth working stage; the motor coil includes the first coil and the second coil, the said The bridge arm converter includes a first bridge arm connected with the first coil and a second bridge arm connected with the second coil.

In the third working stage, the controller 104 controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm 107 according to the power to be driven of the motor 101 and the power to be heated of the motor coil, so that the AC power supply equipment can The electric energy flows back to the AC power supply device through the first coil, the first bridge arm and the bidirectional bridge arm 107, or the electric energy of the AC power supply device flows back to the AC power supply device through the bidirectional bridge arm 107, the second bridge arm and the second coil, At the same time, the electric energy on the bus capacitor flows back to the bus capacitor after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

In the fourth working stage, the controller controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm 107, so that the electric energy of the AC power supply equipment passes through the first coil, the first bridge arm and the bus capacitor And flow back to the AC power supply equipment after flowing through the bidirectional bridge arm 107 or make the electric energy of the AC power supply equipment flow back to the AC power supply equipment after passing through the bidirectional bridge arm 107, the bus capacitor, the second bridge arm and the second coil. A circulating current is formed among the second coil, the first coil, the first bridge arm and the second bridge arm.

Among them, in the third working stage, the electric energy of the AC power supply equipment passes through the first coil, the first bridge arm and the bidirectional bridge arm 107 and then flows back to the AC power supply device or the electric energy of the AC power supply equipment passes through the bidirectional bridge arm 107 and the second bridge arm 107. The arm and the second coil flow back to the AC power supply device to store the electrical energy of the AC power supply device in the first coil or the second coil, that is, to realize the process of driving the motor by the AC power supply device and heating the motor coil. During the energy storage process, due to the current passing through the coil, the motor 101 is in the driving state and the heating state at this time, and the electric energy on the bus capacitor 103 in the third working stage passes through the second bridge arm, the second coil, The first coil and the first bridge arm then flow back to the bus capacitor 103, so that the bus capacitor 103 discharges the first coil and the second coil through the bridge arm converter 102. Since the first coil and the second coil are connected together , therefore, the directions of the currents flowing through the first coil and the second coil are different, so that the AC power supply device can store energy in the first coil while driving the motor 101 and make the first coil and the second coil consume electricity to generate heat. .

Among them, since the third working stage and the fourth working stage constitute a cycle, since the cycle is a fixed value, when the conduction time and length of the first bridge arm and the second bridge arm in the third working stage are determined, the fourth working stage The conduction time and duration of the first bridge arm and the second bridge arm in the stage can be directly determined.

The power of the AC power supply equipment in the fourth working stage passes through the first coil, the first bridge arm and the bidirectional bridge arm 107 and then flows through the bus capacitor 103 and flows back to the AC power supply equipment or the power of the AC power supply equipment passes through the two-way bridge. The arm 107, the busbar capacitor 103, the second bridge arm, and the second coil flow back to the AC power supply device for charging the busbar capacitor 103 by the AC power supply device and the first coil, that is, to realize the driving process of the AC power supply device to the motor and the freewheeling charging process in the heating process of the motor coil. During the freewheeling charging process, due to the current flowing through the motor coil, the driving of the motor 101 and the power consumption of the motor coil are also realized to generate heat. In the fourth working stage The electric energy of the second coil, the first coil, the first bridge arm and the second bridge arm form a circulating current, so as to make the current in the second coil flow to the first coil, because during the first working process, the bus capacitor 103 The output current flows through the second coil and the first coil through the second bridge arm, so that the voltage at the connection point between the second coil and the second bridge arm is greater than the voltage between the first coil and the first bridge arm connection point, so , the current in the second coil can flow to the first coil. Since the first coil and the second coil are connected together, the directions of the current flowing in the first coil and the second coil are different, which can be realized in the AC power supply equipment and the second coil. A coil charges the battery and the bus capacitor 103 while driving the motor and consuming the first and second coils to generate heat.

In this embodiment, by arranging a bidirectional bridge arm in the energy conversion device, when the energy conversion device is connected to the AC power supply equipment, it is only necessary to control the bridge arm converter to adjust the current flowing from the AC power supply device to the driving and heating circuit, and then the power conversion device can be realized. When the AC power supply device drives the motor to output driving power, the coil of the motor consumes electricity to generate heat.

As an embodiment, before the duty cycle of the driving and heating circuit, it also includes a start-up period of the driving and heating circuit;

The start-up cycle of the drive and heating circuits includes a third start-up stage and a fourth start-up stage;

In the third start-up stage, the controller 104 controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm 107 according to the power to be driven of the motor 101 and the power to be heated of the motor coil, so that the AC power supply equipment can be powered on. The electric energy flows back to the AC power supply device after passing through the first coil, the first bridge arm and the bidirectional bridge arm 107, or the electric energy of the AC power supply device flows back to the AC power supply device through the bidirectional bridge arm 107, the second bridge arm and the second coil;

In the fourth start-up stage, the controller 104 controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm 107, so that the electric energy of the AC power supply equipment passes through the first coil, the first bridge arm and the bidirectional bridge arm After 107, it flows through the battery and the bus capacitor 103 and flows back to the AC power supply device or the power of the AC power supply device flows back to the AC power supply device through the bidirectional bridge arm 107, the bus capacitor 103, the second bridge arm and the second coil.

Among them, the working cycle of the driving and heating circuit also includes a start-up cycle for charging the bus capacitor 103, the third start-up stage is used to make the AC power supply equipment store energy in the first coil, and the fourth start-up stage is used to make the AC power supply The device and the first coil charge the bus capacitor 103 to ensure that a high voltage is formed on the bus on both sides of the bus capacitor 103. When the working cycle starts, the bus capacitor 103 discharges the motor coil through the bridge arm converter 102, and then passes the AC The power supply device and the first coil charge the bus capacitor 103, so that the duty cycle can be cycled.

The technical solutions of the embodiments of the present application are specifically described below through a specific circuit structure:

As shown in FIG. 7 , the bridge-side converter 102 includes a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch and a sixth power switch, each power switch The control end of the unit is connected to the controller 104, the first power switch unit and the second power switch unit in the bridge arm converter 102 form the first phase bridge arm, and the third power switch unit and the fourth power switch unit form the second phase bridge arm , the fifth power switch unit and the sixth power switch unit form a third phase bridge arm, the first power switch unit includes a first upper bridge arm VT1 and a first upper bridge diode VD1, and the second power switch unit includes a second lower bridge arm VT2 and the second lower bridge diode VD2, the third power switch unit includes the third upper bridge arm VT3 and the third upper bridge diode VD3, the fourth power switch unit includes the fourth lower bridge arm VT4 and the fourth lower bridge diode VD4, the first The fifth power switch unit includes the fifth upper bridge arm VT5 and the fifth upper bridge diode VD5, the sixth power switch unit includes the sixth lower bridge arm VT6 and the sixth lower bridge diode VD6, the first power switch unit, the third power switch unit and the fifth power switch unit is commonly connected to form a first bus terminal, the second power switch unit, the fourth power switch and the sixth power switch are commonly connected to form a second bus terminal, and a busbar is connected between the first bus terminal and the second bus terminal Capacitor C1, the first end of the bus capacitor C1 is connected to the first end of the switch K1 and the first end of the switch K2, the second end of the bus capacitor C1 is connected to the first end of the switch K3, and the second end of the switch K2 is connected to the resistor R. The first terminal, the second terminal of the switch K1 is connected to the second terminal of the resistor R and the positive terminal of the battery 105, the second terminal of the switch K3 is connected to the negative terminal of the battery 105, and the motor includes a first phase coil L1 and a second phase coil L2. And the third-phase coil L3, one end of each phase coil is connected together to form a neutral point to connect the DC power supply equipment, and the other end of each phase coil is connected to the midpoint of a phase bridge arm, wherein, when the first coil is the first phase When the coil L1 and the second coil include the second-phase coil L2 and the third-phase coil L3, the DC power supply device, the first-phase coil L1, and the second power switch form a DC energy storage circuit, and the DC energy storage circuit is not only used for heating but also For driving, as an embodiment, the current flow is that the positive pole of the DC power supply device flows through the first phase coil L1 and the second lower bridge arm VT2 and returns to the negative pole of the DC power supply device; the DC power supply device, the first phase coil L1, the first power supply The switch and the bus capacitor C1 form a freewheeling circuit, which is used to drive and make the motor coil consume power to generate heat. The current flows to the positive pole of the DC power supply equipment and flows through the first phase coil L1, the first upper bridge arm VT1, and the busbar The capacitor C1 returns to the negative pole of the DC power supply device; the bus capacitor C1, the fifth power switch, the third power switch, the third phase coil L3, the second phase coil L2, the first phase coil L1, and the second power switch form the first drive of the motor In the circuit, the current flows from one end of the bus capacitor C1 through the fifth upper bridge arm VT5, the third phase coil L3, the first phase coil L1, and the second lower bridge arm VT2 back to the bus capacitor C At the same time at the other end of 1, the current flows from one end of the bus capacitor C1 through the third upper bridge arm VT3, the second phase coil L2, the first phase coil L1, and the second lower bridge arm VT2 to return to the other end of the bus capacitor C1; The two-phase coil L2, the third-phase coil L3, the first-phase coil L1, the first power switch, the third power switch, and the fifth power switch form the second drive circuit of the motor, and the current flows in the second-phase coil L2, the first power switch, and the fifth power switch. A circulating current is formed between the phase coil L1, the first upper bridge diode VD1 and the third upper bridge arm VT3 and between the third phase coil L3, the first phase coil L1, the first upper bridge diode VD1 and the fifth upper bridge arm VT5; when When the first coil is the first-phase coil L1 and the second-phase coil L2, and the second coil is the third-phase coil L3, the DC power supply equipment, the first-phase coil L1, the second-phase coil L2, the second power switch, the fourth The power switch forms a DC energy storage circuit, and the DC energy storage circuit is not only used for heating but also for driving. As an embodiment, the current flows to the positive pole of the DC power supply equipment and flows through the first phase coil L1 and the second lower bridge arm VT2 to return to the circuit. The negative pole of the DC power supply device, while the positive pole of the DC power supply device flows through the second phase coil L2 and the fourth lower bridge arm VT4 and returns to the negative pole of the DC power supply device; the DC power supply device, the first phase coil L1, the second phase coil L2, the first power supply The switch, the third power switch, the bus capacitor C1, and the external battery form a freewheeling circuit. The freewheeling circuit is used to drive and make the motor coil consume power to generate heat. The current flows to the positive pole of the DC power supply equipment and flows through the first phase coil L1, The first upper bridge arm VT1 and the bus capacitor C1 return to the negative pole of the DC power supply device, and at the same time, the positive pole of the DC power supply device flows through the second phase coil L2, the second upper bridge arm VT2 and the bus capacitor C1 and returns to the negative pole of the DC power supply device; the bus capacitance C1, the fifth power switch, the third-phase coil L3, the first-phase coil L1, the second-phase coil L2, the second power switch, and the fourth power switch form the first drive circuit of the motor, and the current flows from one end of the bus capacitor C1. Through the fifth upper bridge arm VT5, the third phase coil L3, the first phase coil L1, and the second lower bridge arm VT2, it returns to the other end of the bus capacitor C1, and the current flows from one end of the bus capacitor C1 to the fifth upper bridge. The arm VT5, the third phase coil L3, the second phase coil L2, and the fourth lower bridge arm VT2 return to the other end of the bus capacitor C1; the third phase coil L3, the first phase coil L1, the second phase coil L2, the first The power switch, the third power switch and the fifth power switch form the second drive circuit of the motor, and the current flows between the third phase coil L3, the first phase coil L1, the first upper bridge diode VD1 and the fifth upper bridge arm VT5 and A circulating current is formed among the third phase coil L3, the second phase coil L2, the third upper bridge diode VD3 and the third upper bridge arm VT5, respectively.

For DC power supply, when the first coil is the first-phase coil L1, and the second coil is the second-phase coil L2 and the third-phase coil L3, as shown in FIG. The driving power and the charging power of the battery control the conduction time and length of the first bridge arm and the second bridge arm, so that the current output by the DC power supply device in the DC energy storage circuit flows through the first phase coil L1 and the second power switch in turn. back to the DC power supply equipment, and at the same time make the current output by the bus capacitor C1 in the first drive circuit of the motor flow through the fifth power switch, the third power switch, the third phase coil L3, the second phase coil L2, the first phase coil L1, The second power switch flows back to the bus capacitor C1, so that the DC energy storage circuit and the first drive circuit of the motor work at the same time, so as to make the motor output driving power and make the motor coil consume electricity to generate heat.

As shown in FIG. 8 , in the second working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, so that the current output by the DC power supply device in the freewheeling loop flows through the first phase coil L1 , The first power switch and the bus capacitor C1 flow back to the DC power supply device, so that the current output by the second phase coil L2 and the third phase coil L3 in the second drive circuit of the motor flows through the first phase coil L1, the first power switch, The third power switch and the fifth power switch flow back to the second-phase coil L2 and the third-phase coil L3, so that the freewheeling circuit and the second motor drive circuit work at the same time, so as to make the motor output driving power and make the motor coil consume power generate heat.

For DC power supply, when the first coil is the first-phase coil L1 and the second-phase coil L2, and the second coil is the third-phase coil L3, as shown in FIG. The driving power and the charging power of the battery control the conduction time and length of the first bridge arm and the second bridge arm, so that the current output by the DC power supply equipment in the DC energy storage circuit flows through the first phase coil L1 and the second phase coil L2 in turn , the second power switch and the fourth power switch flow back to the DC power supply equipment, and at the same time make the current output by the bus capacitor C1 in the first drive circuit of the motor flow through the fifth power switch, the third phase coil L3, the second phase coil L2, The first phase coil L1, the second power switch, and the fourth power switch flow back to the bus capacitor C1, so that the DC energy storage circuit and the first drive circuit of the motor work at the same time, which are used to make the motor output driving power and make the motor coil consume power to generate electricity. heat.

As shown in FIG. 10 , in the second working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, so that the current output by the DC power supply device in the freewheeling loop flows through the first phase coil L1 , the second-phase coil L2, the first power switch, the third power switch, and the bus capacitor C1 flow back to the DC power supply device, so that the current output by the third-phase coil L3 in the second drive circuit of the motor flows through the first-phase coil L1, The two-phase coil L2, the first power switch, the third power switch and the fifth power switch flow back to the third-phase coil L3, so that the freewheeling circuit and the second driving circuit of the motor work at the same time, so as to make the motor output driving power and make the motor The coils consume electricity to generate heat.

For AC power supply, as shown in FIG. 11 , the difference from FIG. 7 is that the driving and heating circuit further includes a bidirectional bridge arm 107 , and the bidirectional bridge arm 107 includes a seventh power switch and an eighth power switch. One end is connected to the first bus end of the bridge arm converter 102, the second end of the seventh power switch and the first end of the eighth power switch are connected to one end of the AC power supply device, and the second end of the eighth power switch is connected to the bridge At the second bus end of the arm converter 102, when the first coil is the first-phase coil L1, and the second coil includes the second-phase coil L2 and the third-phase coil L3, the AC power supply equipment, the first-phase coil L1, the second-phase coil L1, the second-phase coil The power switch and the eighth power switch form an AC energy storage circuit, and the AC power supply device, the first phase coil L1, the first power switch, and the seventh power switch can also form an AC energy storage circuit. As an embodiment, the current flows in an AC energy storage circuit. The positive pole of the power supply device flows through the first phase coil L1, the second lower bridge arm VT2, and the eighth lower bridge arm VT8 and returns to the negative pole of the DC power supply device; the AC power supply device, the first phase coil L1, the first power switch, the bus capacitor C1, The eighth power switch forms a freewheeling loop. The AC power supply device, the bidirectional bridge arm 107, the bus capacitor, the second bridge arm, and the second coil can also form a freewheeling loop. The freewheeling loop is not only used for heating but also for driving. The positive electrode of the AC power supply equipment flows back to the negative electrode of the AC power supply equipment through the first phase coil L1, the first upper bridge arm VT1, the bus capacitor C1 and the eighth lower bridge diode VD8, or the negative electrode of the AC power supply equipment flows through the eighth lower bridge arm VT8 , The bus capacitor C1, the third upper bridge arm VT3, and the second phase coil L2 return to the positive pole of the AC power supply device, while the negative pole of the AC power supply device flows through the eighth lower bridge arm VT8, the busbar capacitor C1, the fifth upper bridge arm VT5, the first The three-phase coil L3 returns to the positive pole of the AC power supply device; the bus capacitor C1, the fifth power switch, the third power switch, the third-phase coil L3, the second-phase coil L2, the first-phase coil L1, and the second power switch form the first phase of the motor. Three drive circuits, the current flows from one end of the bus capacitor C1 through the fifth upper bridge arm VT5, the third phase coil L3, the first phase coil L1, and the second lower bridge arm VT2 to return to the other end of the bus capacitor C1, while the current flows from One end of the bus capacitor C1 flows through the third upper bridge arm VT3, the second phase coil L2, the first phase coil L1, and the second lower bridge arm VT2 to return to the other end of the bus capacitor C1; the second phase coil L2, the third phase coil L2, the third phase coil The coil L3, the first-phase coil L1, the first power switch, the third power switch, and the fifth power switch form the fourth motor drive circuit, and the current flows in the second-phase coil L2, the first-phase coil L1, and the first upper bridge. A circulating current is formed between the diode VD1 and the third upper bridge arm VT3 and between the third phase coil L3, the first phase coil L1, the first upper bridge diode VD1 and the fifth upper bridge arm VT5; when the first coil is the first phase coil L1 and the second-phase coil L2, when the second coil is the third-phase coil L3, the AC power supply equipment, the first-phase coil L1, the second-phase coil L2, the second power switch, the fourth power switch, and the eighth power switch An AC energy storage circuit is formed. The AC energy storage circuit is not only used for energy storage, but also for driving and heating the motor coil. The second lower bridge arm VT2 and the eighth lower bridge arm VT8 return to the negative pole of the AC power supply device, and the positive pole of the AC power supply device flows through the second phase coil L2, the fourth lower bridge arm VT4, and the eighth lower bridge arm VT8 and returns to the AC power supply device Negative pole; AC power supply equipment, the first phase coil L1, the second phase coil L2, the first power switch, the third power switch, the bus capacitor 103, and the eighth power switch form a freewheeling circuit, which is not only used for heating but also for Drive, the current flows for the positive pole of the AC power supply equipment to flow through the first phase coil L1, the first upper bridge arm VT1, the bus capacitor C1, and the eighth lower bridge diode VD8 to return to the negative pole of the AC power supply equipment, and at the same time, the positive pole of the AC power supply equipment flows through the The two-phase coil L2, the second upper bridge arm VT2, the bus capacitor C1, and the eighth lower bridge diode VD8 return to the negative pole of the AC power supply device; the bus capacitor C1, the fifth power switch, the third phase coil L3, the second phase coil L2, The first-phase coil L1, the second power switch, and the fourth power switch form the third drive circuit of the motor, and the current flows from one end of the bus capacitor C1 through the fifth upper bridge arm VT5, the third-phase coil L3, and the first-phase coil L1 , The second lower bridge arm VT2 returns to the other end of the bus capacitor C1; at the same time, the current flows from one end of the bus capacitor C1 through the fifth upper bridge arm VT5, the third phase coil L3, the second phase coil L2, and the fourth lower bridge. The arm VT4 returns to the other end of the bus capacitor C1; the third-phase coil L3, the first-phase coil L1, the second-phase coil L2, the first power switch, the third power switch and the fifth power switch form the fourth motor drive circuit, The current flows between the third phase coil L2, the first phase coil L1, the first upper bridge diode VD1 and the fifth upper bridge arm VT5 and between the third phase coil L3, the second phase coil L2, the third upper bridge diode VD3 and the Circulation currents are formed between the third upper bridge arms VT5 respectively.

When the first coil is the first-phase coil L1, and the second coil includes the second-phase coil L2 and the third-phase coil L3, as shown in FIG. 11, in the third working stage, the controller 104 according to the driving power of the motor and the battery The charging power of the first bridge arm and the second bridge arm control the conduction time and length of the first bridge arm, so that the current output by the AC power supply equipment in the AC energy storage circuit flows through the first phase coil L1, the second power switch, and the eighth power switch in turn. It flows back to the AC power supply equipment, and at the same time, the current output by the bus capacitor 103 in the first drive circuit of the motor flows through the fifth power switch, the third power switch, the third phase coil L3, the second phase coil L2, and the first phase coil L1. , The second power switch flows back to the bus capacitor 103, so that the AC energy storage circuit and the third drive circuit of the motor work at the same time, so as to make the motor output driving power and make the motor coil consume electricity to generate heat.

As shown in FIG. 12 , in the fourth working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, so that the current output by the AC power supply device in the freewheeling loop flows through the first phase coil L1 , the first power switch, the bus capacitor 103, and the eighth power switch flow back to the AC power supply device, so that the current output by the second-phase coil L2 and the third-phase coil L3 in the fourth drive circuit of the motor flows through the first-phase coil L1, the first-phase coil L1, the third-phase coil L3 A power switch, a third power switch and a fifth power switch flow back to the second-phase coil L2 and the third-phase coil L3, so that the battery charging circuit and the fourth motor drive circuit work simultaneously, so as to make the motor output driving power and make the motor The coils consume electricity to generate heat.

When the first coil is the first-phase coil L1 and the second-phase coil L2, and the second coil is the third-phase coil L3, as shown in FIG. 13, in the third working stage, the controller 104 according to the driving power of the motor and the battery The charging power of the controller controls the conduction time and length of the first bridge arm and the second bridge arm, so that the current output by the DC power supply equipment in the AC energy storage circuit flows through the first phase coil L1, the second phase coil L2, and the second power in turn. The switch, the fourth power switch, and the eighth power switch flow back to the AC power supply device, and at the same time, the current output by the bus capacitor 103 in the third drive circuit of the motor flows through the fifth power switch, the third-phase coil L3, and the first-phase coil L1 in sequence. , the second phase coil L2, the second power switch, and the fourth power switch flow back to the bus capacitor 103, so that the AC energy storage circuit and the third drive circuit of the motor work at the same time, so as to make the motor output driving power and make the motor coil consume power generate heat.

As shown in FIG. 14 , in the fourth working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, so that the current output by the AC power supply equipment in the freewheeling loop flows through the first phase coil L1 , the second-phase coil L2, the first power switch, the third power switch, the bus capacitor 103, and the eighth power switch flow back to the AC power supply equipment, so that the current output by the third-phase coil L3 in the fourth drive circuit of the motor flows through the first The phase coil L1, the second phase coil L2, the first power switch, the third power switch and the fifth power switch flow back to the third phase coil L3, so that the battery charging circuit and the fourth motor drive circuit work at the same time, so as to make the motor output Drive power and make the motor coils consume electricity to generate heat.

As an embodiment, when the battery 105 is used as a power supply device, the working cycle of the driving and heating circuit includes a fifth working stage and a sixth working stage; the motor coil includes a first coil and a second coil, and the bridge arm converter 102 includes and a first bridge arm connected to the first coil and a second bridge arm connected to the second coil;

In the fifth working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the to-be-driven power of the motor 101 and the to-be-heated power of the motor coil, so that the electric energy of the battery 105 passes through the second bridge arm , the second coil, the first coil and the first bridge arm flow back to the battery 105;

In the sixth working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, and electric energy forms a circulating current among the second coil, the first coil, the first bridge arm and the second bridge arm.

In the fifth working stage, the electric energy of the battery flows back to the battery 105 after passing through the second bridge arm, the second coil, the first coil and the first bridge arm, so as to realize the storage of the electric energy of the battery in the first coil and the first bridge arm. In the second coil, the driving process of the battery to the motor and the energy storage process during the heating process of the motor coil are realized. Since the current flows through the first coil and the second coil during the energy storage process, the motor 101 can be driven to run at this time. The first coil and the second coil generate heat.

Among them, since the fifth working stage and the sixth working stage constitute a cycle, since the cycle is a fixed value, when the conduction time and length of the first bridge arm and the second bridge arm in the fifth working stage are determined, the sixth working stage The conduction time and duration of the first bridge arm and the second bridge arm in the stage can be directly determined.

Wherein, the electric energy in the sixth working stage forms a circulating current among the second coil, the first coil, the first bridge arm and the second bridge arm, so as to make the current in the second coil flow to the first coil. During operation, the current output by the battery 105 flows through the second coil through the second bridge arm, and then flows through the second coil and the first coil, so that the voltage at the connection point between the second coil and the second bridge arm increases. The relationship between the voltage of the capacitor on the charging and discharging port side and the voltage of the connection point between the coil and the second bridge arm determines the direction of current flow. If the voltage of the connection point between the second coil and the second bridge arm is greater than that on the charging and discharging port side When the voltage of the capacitor is higher than Together, therefore, the directions of the currents flowing in the first coil and the second coil are different, so that the motor 101 can be driven and the first coil and the second coil can generate heat.

The technical solution of this embodiment is described in detail below through a specific circuit structure:

When the first coil is the first-phase coil L1, and the second coil includes the second-phase coil L2 and the third-phase coil L3, as shown in FIG. 15, the fifth working stage is that the current flows through the battery 105 and the third upper bridge arm VT3, the second phase coil L2, the first phase coil L1, and the second lower bridge arm VT2 return to the battery 105, and at the same time, the current flows through the battery 105, the fifth upper bridge arm VT5, the third phase coil L3, and the first phase coil L1 and the second lower bridge arm VT2 are returned to the battery 105 .

As shown in FIG. 16 , in the sixth working stage, the current flows between the second phase coil L2, the first phase coil L1, the first upper bridge diode VD1 and the third upper bridge arm VT3 and the third phase coil L3, the first A circulating current is formed among the phase coil L1, the first upper bridge diode VD1 and the third upper bridge arm VT5, respectively.

When the first coil is the first-phase coil L1 and the second-phase coil L2, and the second coil is the third-phase coil L3, as shown in FIG. 17, the fifth working stage is when the current flows through the battery 105 and the fifth upper bridge arm VT5, the third-phase coil L3, the first-phase coil L1, and the second lower arm VT2 return to the battery 105, and at the same time, current flows through the battery 105, the fifth upper arm VT5, the third-phase coil L3, and the second-phase coil L2 and the fourth lower bridge arm VT4 are returned to the battery 105 .

As shown in FIG. 18 , in the sixth working stage, the current flows between the third-phase coil L3, the first-phase coil L1, the first high-bridge diode VD1 and the fifth high-bridge arm VT5 and the third-phase coil L3, the second A circulating current is formed between the phase coil L2, the third upper bridge diode VD3 and the third upper bridge arm VT5, respectively.

In this embodiment, when the energy conversion device is not connected to an external power source, the battery inside the vehicle can be used to supply power to the driving and heating circuits, and it is only necessary to control the bridge arm converter to adjust the current flowing from the battery to the driving and heating circuits to achieve the When the battery-driven motor outputs driving power, the motor coil consumes electricity and generates heat, and then supplies power to the same system through different power sources to enable the motor to output driving power and the motor coil to consume electricity and dissipate heat, so that the energy conversion device is not connected to the outside. In the power state, the motor outputs the driving power and the motor coil consumes electricity and dissipates heat at the same time.

As an embodiment, the motor coil, the bridge arm converter 102 and the bus capacitor 103 form a driving heating and discharging circuit;

When the external charging and discharging port is connected to the external electrical equipment, according to the power to be driven of the motor 101 , the power to be charged of the external electrical equipment and the power to be heated of the motor coil, the bridge arm converter 102 is controlled to make the external battery 105 The electric energy flows to the driving heating and discharging circuit, and the current of the driving heating and discharging circuit is adjusted, so that the motor 101 outputs driving power, charges the external electrical equipment, and causes the motor coil to consume electricity and generate heat at the same time.

Among them, the heat generated by the power consumption of the motor coil can be used to heat the equipment to be heated. For example, when the external ambient temperature is low, the battery is heated, and the heating by the motor coil can exchange heat flowing through the motor coil. The medium is heated, and the cooling circuit of the motor is communicated with the cooling circuit of the battery, thereby realizing the heating of the battery.

The controller 104 obtains the to-be-driven power of the motor 101 according to the to-be-driven power of the motor 101 , the to-be-charged power of the external electrical device, and the to-be-heated power of the motor coil, and according to the target driving power of the motor 101 and the current driving power of the motor 101 . , according to the target heating power of the motor coil and the current heating power of the motor coil to obtain the to-be-heated power of the motor coil, and according to the to-be-driven power, the to-be-heated power and the to-be-charged power, the bridge arm converter 102 is controlled to make the electric energy of the battery flow to the drive heating The discharge circuit refers to adjusting the turn-on or turn-off and turn-on time of different power switches in the bridge arm converter 102, thereby adjusting the magnitude and direction of the current flowing through the motor coil. The current direction of the motor coil is the direction of each phase flowing into the motor The direction of the coil or the outflow direction of each phase coil in the motor, the current size of the motor coil refers to the size of the current flowing into each phase coil in the motor or the size of the current flowing out of each phase coil in the motor, for example, from the bridge arm converter 102 The motor coil connected to the A-phase bridge arm in the bridge arm converter 102 flows into the motor, and flows out of the motor from the motor coil connected to the B-phase and C-phase bridge arms in the bridge arm converter 102. Since the current size and direction of each phase coil in the motor can be adjusted The motor torque output and heating power, and the sum of the current flowing through the motor is equal to the input current of the connection point of each phase coil of the motor, the input current can be used to adjust the power to be charged, by adjusting the current size of each phase coil of the motor It can control the charging process of the battery to the electrical equipment, the output torque of the motor and the heating process of the motor coil at the same time.

The technical effect of an energy conversion device according to an embodiment of the present application is that: by arranging a motor coil, a bridge arm converter and a bus capacitor in the energy conversion device and forming a driving heating and discharging circuit, it is only necessary to control the bridge arm converter to adjust the battery flow to drive the By heating the current of the discharge circuit, the output power of the battery-driven motor can be discharged, and the electrical equipment can be discharged and the motor coil can consume electricity to generate heat, thereby realizing the use of the same system for vehicle motor drive, battery discharge and motor coil heating. process, high degree of component reuse, high system integration and simple structure, thereby reducing the system cost, reducing the system volume, and solving the overall structure of the existing motor control system, low integration, large volume and cost. high question.

As an embodiment, the bridge arm converter 102 obtains the conduction time and duration according to the to-be-driven power of the motor 101 , the to-be-charged power of the external electrical device, and the to-be-heated power of the motor coil, and adjusts the drive according to the conduction time and duration The current that drives the heat-discharge circuit.

计算驱动功率；N为电机转速，Te为电机扭矩，P₁为驱动功率，再根据公式

计算目标输入电流，P为需求加热功率，P₂为需求充电功率，U₂为降压侧电容的目标电压。根据电机转子位置、目标输入电流以及电机扭矩输出值按照以下公式1、公式2以及公式3计算三相电机的每相电的目标电流：Wherein, as an embodiment, as shown in FIG. 2 , taking a three-phase motor as an example, the target input current of the three-phase motor is calculated according to the power to be heated, the power to be charged, the motor torque output value and the target voltage, and the output current of the three-phase motor is calculated according to the motor torque output value. value to calculate the driving power, which can be calculated according to the formula

Calculate the driving power; N is the motor speed, Te is the motor torque, P ₁ is the driving power, and then according to the formula

Calculate the target input current, P is the required heating power, P ₂ is the required charging power, and U ₂ is the target voltage of the buck side capacitor. According to the motor rotor position, the target input current and the motor torque output value, the target current of each phase of the three-phase motor is calculated according to the following formulas 1, 2 and 3:

Formula 1:

Formula 2: IA+IB+IC=I

Formula 3: P=(IA×IA+IB×IB+IC×IC)×R

Among them, α is the rotor electrical angle, IA, IB, IC are the target current of each phase of the three-phase motor, I is the target input current, Te is the motor torque output value, λ, ρ, L _d , L _q are the motor parameters , P is the heating power.

Among them, according to formula 1, formula 2, formula 3, the data of the target currents IA, IB, and IC of each phase of the three-phase motor can be obtained.

According to the target voltage of the buck side capacitor, the target input current and the voltage of the power battery, the average duty cycle of the three-phase electrical control pulse is obtained by the following formula:

Formula 4: U ₂ =U ₁ ×D ₀ -I×R, where U ₂ is the target voltage of the buck-side capacitor, U ₁ is the voltage of the power battery, and D ₀ is the average duty cycle of the three-phase electrical control pulse , I is the target input current, and R is the equivalent impedance of the three-phase motor.

Among them, U ₁ ×D ₀ is the voltage across the three-phase inverter, and I×R is the voltage drop across the three-phase motor. According to the voltage across the three-phase inverter, it is equal to the voltage drop across the three-phase motor and the voltage drop. The sum of the target voltages of the side capacitances yields the above formula.

According to the average duty cycle, the target input current, the target current of each phase, and the voltage of the power battery, the first target duty cycle of the control pulse of each phase bridge arm is obtained according to the following formula:

Formula 5:

Among them, I ₁ is the target current of each phase of electricity, R ₁ is the equivalent impedance of each phase coil, and D ₁ is the target duty cycle of the control pulse of each phase bridge arm.

Among them, when the flow direction of the current in the winding coil is from the connection point of each phase bridge arm and each phase coil to the step-down side capacitor, the voltage of the connection point of each phase bridge arm and each phase coil is greater than the voltage of the step-down side capacitor. , the voltage of the connection point between the bridge arm of each phase and the coil of each phase is equal to the sum of the voltage drop on the phase coil and the target voltage of the capacitor on the step-down side, that is, U ₁ ×D ₁ =R ₁ ×I ₁ +U ₂ , when The direction of current flow in the winding coil is from the capacitor on the step-down side to the connection point between the bridge arm of each phase and the coil of each phase. The voltage at the connection point between the bridge arm and each phase coil is equal to the difference between the target voltage of the buck-side capacitor and the voltage drop on the phase coil, that is, U ₁ ×D ₁ =U ₂ -R ₁ ×I ₁ , combined with the above formula 4 to obtain formula 5, that is, to obtain the target duty cycle of the control pulse of each phase bridge arm.

As an embodiment, the working cycle of driving the heating and discharging circuit includes a seventh working stage and an eighth working stage; the motor coil includes a first coil and a second coil, and the bridge arm converter includes a connection with the first coil a first bridge arm connected and a second bridge arm connected with the second coil;

In the seventh working stage, the controller controls the first bridge arm and the The turn-on time and duration of the second bridge arm make the electric energy of the battery flow back to the battery after passing through the second bridge arm, the second coil, the first coil and the first bridge arm , and at the same time make the electric energy flow back to the battery after passing through the second bridge arm, the second coil and the electric device;

In the eighth working stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm, and the electrical energy is A circulating current is formed between a bridge arm and the second bridge arm, and at the same time, electric energy forms a circulating current among the second coil, the electrical equipment and the second bridge arm.

Wherein, in the seventh working stage, the first coil is a one-phase coil or a coil with at least two phases connected together, the first bridge arm is one bridge arm or at least two bridge arms connected in parallel, and one of the first coils The phase coil is connected with one bridge arm in the first bridge arm, the second coil is a one-phase coil or a coil with at least two phases connected together, the second bridge arm is one bridge arm or at least two bridge arms connected in parallel, the first One phase coil in the second coil is connected to one bridge arm in the second bridge arm. The difference between the first coil and the second coil is that the currents of the two coils are in opposite states. For example, the control of the bridge arm converter 102 The first bridge arm causes the current in the first coil to flow in a first direction, which may be from the motor to the motor controller 104, and controls the second bridge arm of the bridge arm converter 102 to make the current in the second coil flow. The direction of the current is to flow along the second direction, and the second direction can be from the motor controller 104 to the motor, that is, there are currents flowing in different directions in the motor coils in the first working stage. The electrical equipment performs charging and control of the heating of the motor coils.

It should be noted that the coils in the first coil and the second coil are not fixed, the first coil and the second coil are changed at any time according to the current direction, and the power switch of the bridge arm connected to the coil can be selected for control, for example, The motor includes a first-phase coil L1, a second-phase coil L2 and a third-phase coil L3, and the lower arm of the bridge arm connected to the first-phase coil L1 is controlled to be turned on so that the current in the first-phase coil L1 flows from the motor. The coil-to-bridge converter 102 controls the conduction of the upper bridge arm of the bridge arm connected to the second-phase coil L2 and the third-phase coil L3 so that the current in the second-phase coil L2 and the third-phase coil L3 flows from the bridge. The arm inverter 102 is connected to the motor coil. At this time, the first coil is the first-phase coil L1, the second coil is the second-phase coil L2 and the third-phase coil L3. In the next cycle, by changing the conduction in the bridge arm The power switch can change the direction of the current in the motor coil, and the first coil can be the first phase coil L1 and the second phase coil L2, and the second coil can be the third phase coil L3.

Wherein, in the seventh working stage, the electric energy of the battery flows back to the battery after passing through the second bridge arm, the second coil, the first coil and the first bridge arm, so as to realize the storage of the electric energy of the battery in the first coil and the second bridge arm. In the coil, the energy storage process, the motor driving process and the heating process of the motor coil during the discharging process of the battery are realized. Since there is current flowing in the first coil and the second coil, the motor can be driven to run and generate heat at this time. After passing through the battery, the second bridge arm, the second coil, the first coil and the electrical equipment, it flows back to the battery, so that the battery discharges the electrical equipment through the bridge arm converter 102. Since the first coil and the second coil Connected together, therefore, the directions of the current flowing in the first coil and the second coil are different, so that the motor can be continuously driven and heating.

Among them, since the seventh working stage and the eighth working stage constitute a cycle, since the cycle is a fixed value, when the conduction time and length of the first bridge arm and the second bridge arm in the seventh working stage are determined, the eighth working stage The conduction time and duration of the first bridge arm and the second bridge arm in the stage can be directly determined.

Among them, the electric energy in the eighth working stage forms a circulating current between the second coil, the electric equipment and the second bridge arm, which is used to realize the discharge of the electric equipment by the second coil, that is, the discharge process of the battery to the electric equipment is realized. During the freewheeling discharge process in the second coil, at the same time, there is current flowing in the second coil to drive the motor and heat the motor coil. The electric energy in the eighth working stage is in the second coil, the first coil, the first bridge arm and the second bridge arm. A circulating current is formed between the two coils, so that the current in the second coil flows to the first coil, because in the seventh working process, the current output by the battery flows through the second coil through the second bridge arm, and then flows through the second coil and the first coil. The coil increases the voltage at the connection point between the second coil and the second bridge arm. The current flow direction is determined by the relationship between the voltage of the capacitor on the charging and discharging port side and the voltage at the connection point between the coil and the second bridge arm. , if the voltage of the connection point between the second coil and the second bridge arm is greater than the voltage of the capacitor on the charging and discharging port side, the direction of the winding current flows from the connection point between the second coil and the second bridge arm. Therefore, it is possible to The current in the second coil flows to the first coil. Since the first coil and the second coil are connected together, the directions of the current flowing through the first coil and the second coil are different, and the motor can be driven and the motor coil can be driven. Power consumption produces heat.

In this embodiment, the working cycle of driving the charging and heating circuit is divided into a seventh working stage and an eighth working stage, and each working stage includes the process of discharging the electrical equipment, the process of driving the motor, and the process of heating the motor coil. , by controlling the turn-on time and length of the first bridge arm and the second bridge arm, respectively adjust the current driving the charging and heating circuit in the first working stage and the second working stage, so that part of the energy output by the battery in the entire working cycle is used for The electric equipment is discharged, a part drives the motor, and the other part heats the motor coil, so as to realize the coordinated work of discharging the electric equipment, driving the motor and heating the motor coil.

The second embodiment of the present application provides an energy conversion device. As shown in FIG. 19 , the energy conversion device includes:

motor;

a vehicle-mounted charging module, including a charging connection terminal group, and the charging connection terminal group includes a first charging connection terminal and a second charging connection terminal;

The motor control module includes a bridge arm converter 102, and the bridge arm converter 102 is connected to the motor coil of the motor;

The energy storage module includes a bus capacitor 103 and an energy storage connection terminal group 109 connected in parallel, the bus capacitor 103 is connected in parallel with the bridge arm converter 102, and the energy storage connection terminal group 109 includes a first energy storage connection terminal, a second energy storage connection terminal storage connection;

a controller 104, which is connected to the bridge arm converter 102;

The motor coil, the bridge arm converter 102 and the bus capacitor 103 form a driving and heating circuit; the controller 104 controls the bridge arm converter 102 to make the external electric energy flow to the driving and heating according to the to-be-driven power of the motor and the to-be-charged power of the external battery circuit, and adjusts the current of the driving and heating circuit, so that the external electric energy drives the motor to output the driving power while discharging externally through the driving and heating circuit.

Further, the first charging connection terminal and the second charging connection terminal are respectively connected with an external power source, and the external battery is respectively connected with the first energy storage connection terminal and the second energy storage connection terminal;

The controller 104 obtains the turn-on time and duration of the bridge arm converter 102, and adjusts the currents of the driving and heating circuits according to the turn-on time and duration, so that the motor 101 outputs driving power and at the same time causes the motor coil to actively consume electricity and generate heat for heating Battery.

Further, the external power supply is a DC power supply device, and the working cycle of the driving and heating circuit includes a first working stage and a second working stage; the motor coil includes a first coil and a second coil, and the bridge arm converter 102 includes a connection with the first coil. The first bridge arm and the second bridge arm connected with the second coil;

In the first working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the to-be-driven power of the motor and the to-be-charged power of the battery, so that the electric energy of the DC power supply device passes through the first coil and the second bridge arm. After a bridge arm flows back to the DC power supply equipment, at the same time, the electric energy on the bus capacitor 103 flows back to the bus capacitor 103 after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

In the second working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, and the electric energy of the DC power supply device flows through the battery and the bus capacitor 103 after passing through the first coil and the first bridge arm. Returning to the DC power supply device, at the same time, the electric energy forms a circulating current among the second coil, the first coil, the first bridge arm and the second bridge arm.

Further, in the second working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the power to be charged of the battery, so that the electric energy of the DC power supply device passes through the first coil and the first bridge arm. Afterwards, it flows through the battery and the bus capacitor 103 and flows back to the DC power supply device. At the same time, the electric energy forms a circulating current among the second coil, the first coil, the first bridge arm and the second bridge arm.

Further, it also includes a bidirectional bridge arm, the bidirectional bridge arm is connected in parallel with the bridge arm converter 102, the bidirectional bridge arm is connected in parallel with the bridge arm converter 102, the charging connection end group further includes a third charging connection end, and the bidirectional bridge arm also The controller 104 is connected to the third charging connection terminal, and the third charging connection terminal is connected to an external power supply, and the external power supply, the motor coil, the bridge arm converter 102, the bidirectional bridge arm, the bus capacitor 103 and the battery form a driving and heating circuit;

The controller 104 obtains the turn-on time and duration of the bridge arm converter 102, and adjusts the current of the driving and heating circuits according to the turn-on time and duration, and drives the motor through the driving and heating circuits to output driving power while the motor coils actively consume power. heat to heat the battery.

Further, the external power supply also includes an AC power supply device, the working cycle of the driving and heating circuit includes a third working stage and a fourth working stage, the motor coil includes a first coil and a second coil, and the bridge arm converter 102 includes a first coil and a second coil. a first bridge arm connected and a second bridge arm connected with the second coil;

In the third working stage, the controller 104 controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm according to the to-be-driven power of the motor 101 and the to-be-heated power of the motor coil, so that the electric energy of the AC power supply device is After passing through the first coil, the first bridge arm and the bidirectional bridge arm, it flows back to the AC power supply device, or the electrical energy of the AC power supply device flows back to the AC power supply device through the bidirectional bridge arm, the second bridge arm and the second coil. At the same time, the electric energy on the bus capacitor 103 flows back to the bus capacitor 103 after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

In the fourth working stage, the controller 104 controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm, so that the power of the AC power supply device passes through the first coil, the first bridge arm and the bidirectional bridge arm. Flow through the battery and the bus capacitor 103 and flow back to the AC power supply device or make the power of the AC power supply device flow back to the AC power supply device after passing through the bidirectional bridge arm, the bus capacitor 103, the second bridge arm, and the second coil, At the same time, electric energy forms a circulating current among the second coil, the first coil, the first bridge arm and the second bridge arm.

Further, when the battery 105 is used as the power supply device, the working cycle of the driving and heating circuit includes the fifth working stage and the sixth working stage; the motor coil includes the first coil and the second coil, and the bridge arm converter 102 includes the first coil and the first coil. a first bridge arm connected and a second bridge arm connected with the second coil;

In the fifth working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the to-be-driven power of the motor 101 and the to-be-heated power of the motor coil, so that the electric energy of the battery 105 passes through the second bridge arm , the second coil, the first coil and the first bridge arm flow back to the battery 105;

In the sixth working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, and electric energy forms a circulating current among the second coil, the first coil, the first bridge arm and the second bridge arm.

Further, the motor coil, the bridge arm converter and the bus capacitor 103 form a driving heating and discharging circuit;

When the first charging connection end and the second charging connection end are connected to the external electrical equipment, the bridge arm converter 102 is controlled according to the to-be-driven power of the motor 101 , the to-be-charged power of the external electrical equipment and the to-be-heated power of the motor coil The electric energy of the external battery 105 is flowed to the driving heating and discharging circuit, and the current of the driving heating and discharging circuit is adjusted, so that the motor 101 outputs driving power, charges the external electrical equipment, and causes the motor coil to consume power and generate heat at the same time.

Further, the working cycle of driving the heating and discharging circuit includes a seventh working stage and an eighth working stage; the motor coil includes a first coil and a second coil, and the bridge arm converter includes a first bridge arm connected to the first coil and a first bridge arm connected to the first coil. The second bridge arm connected by the two coils;

In the seventh working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the to-be-driven power of the motor 101, the to-be-charged power of the external electrical equipment, and the to-be-heated power of the motor coil, so that the The electric energy of the battery 105 flows back to the battery 105 after passing through the second bridge arm, the second coil, the first coil and the first bridge arm, and at the same time makes the electric energy flow back to the battery after passing through the second bridge arm, the second coil and the electrical equipment. 105;

In the eighth working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, and the electric energy forms a circulating current among the second coil, the first coil, the first bridge arm and the second bridge arm, At the same time, electric energy forms a circulating current among the second coil, the electrical equipment and the second bridge arm.

The third embodiment of the present application provides a vehicle. As shown in FIG. 20 , the vehicle further includes the energy conversion device of the above embodiment.

The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The recorded technical solutions are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application, and should be included in the application. within the scope of protection.

Claims (18)

1. An energy conversion device, characterized in that, comprising a motor coil of a motor, a bridge arm converter, a bus capacitor connected in parallel with the bridge arm converter and a controller connected with the bridge arm converter; the bridge arm converter is connected to the motor coil; The motor coil, the bus capacitor and the bridge arm converter are all connected to an external charging and discharging port, and the bus capacitor is connected in parallel with an external battery; The motor coil, the bridge arm converter and the bus capacitor form a driving and heating circuit; According to the to-be-driven power of the motor and the to-be-heated power of the motor coil, the controller controls the bridge arm converter to make the electric energy of the external power supply connected to the external charging and discharging port or the external battery flow to the direction of the electric power of the external battery. The driving and heating circuit adjusts the current of the driving and heating circuit, so that the motor outputs driving power and at the same time causes the motor coil to consume electricity to generate heat. 2 . The energy conversion device according to claim 1 , wherein the controller obtains the on-time and duration, and adjust the currents of the driving and heating circuits according to the on-time and duration. 3 . The energy conversion device according to claim 1 , wherein when the external charging and discharging port is connected to an external power source and the external power source is a DC power supply device, the duty cycle of the driving and heating circuit includes the first 3 . A working stage and a second working stage; the motor coil includes a first coil and a second coil, and the bridge arm converter includes a first bridge arm connected with the first coil and a first bridge arm connected with the second coil two bridge arms; In the first working stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm according to the to-be-driven power of the motor and the to-be-heated power of the motor coil, The electric energy of the DC power supply device flows back to the DC power supply device after passing through the first coil and the first bridge arm, and at the same time, the electric energy on the bus capacitor passes through the second bridge arm, the The second coil, the first coil and the first bridge arm flow back to the bus capacitor; In the second working stage, the controller controls the timing and duration of the conduction of the first bridge arm and the second bridge arm, and the electric energy of the DC power supply device passes through the first coil and the second bridge arm. A bridge arm then flows through the bus capacitor and flows back to the DC power supply device. At the same time, the electrical energy flows between the second coil, the first coil, the first bridge arm and the second bridge arm. Circulation is formed between. 4. The energy conversion device of claim 3, further comprising a start-up period of the driving and heating circuit before the operating period of the driving and heating circuit; The start-up cycle of the drive and heating circuit includes a first start-up phase and a second start-up phase; In the first start-up stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm according to the to-be-driven power of the motor and the to-be-heated power of the motor coil, so that the The electric energy of the DC power supply device flows back to the DC power supply device after passing through the first coil and the first bridge arm; In the second start-up stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm, so that the electric energy of the DC power supply device passes through the first coil and the second bridge arm. A bridge arm then flows through the bus capacitor and flows back to the DC power supply device. 5 . The energy conversion device according to claim 1 , further comprising a bidirectional bridge arm, the external charging and discharging port further comprising an AC charging port, and the bidirectional bridge arm is connected in parallel with the bridge arm converter. 6 . , the bidirectional bridge arm is also connected to the controller and the AC charging port, the AC charging port is connected to the AC power supply device, and the working cycle of the driving and heating circuit includes the third working stage and the fourth working stage; The motor coil includes a first coil and a second coil, and the bridge arm converter includes a first bridge arm connected with the first coil and a second bridge arm connected with the second coil; In the third working stage, the controller controls the power of the first bridge arm, the second bridge arm and the bidirectional bridge arm according to the to-be-driven power of the motor and the to-be-heated power of the motor coil The turn-on time and duration make the electric energy of the AC power supply device flow back to the AC power supply device after passing through the first coil, the first bridge arm and the two-way bridge arm, or make the power supply of the AC power supply device flow back to the AC power supply device. The electric energy flows back to the AC power supply device through the bidirectional bridge arm, the second bridge arm, and the second coil, and at the same time, the electric energy on the bus capacitor passes through the second bridge arm, the second coil, The first coil and the first bridge arm flow back to the bus capacitor; In the fourth working stage, the controller controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm, so that the electrical energy of the AC power supply device passes through the The first coil, the first bridge arm, and the bus capacitor flow through the two-way bridge arm and then flow back to the AC power supply device or make the power of the AC power supply device pass through the two-way bridge arm, the The bus capacitor, the second bridge arm, and the second coil flow back to the AC power supply device. A circulation is formed between the second bridge arms. 6. The energy conversion device of claim 5, further comprising a start-up period of the driving and heating circuit before the operating period of the driving and heating circuit; The start-up cycle of the drive and heating circuit includes a third start-up phase and a fourth start-up phase; In the third start-up stage, the controller controls the power of the first bridge arm, the second bridge arm and the bidirectional bridge arm according to the to-be-driven power of the motor and the to-be-heated power of the motor coil The turn-on time and duration are such that the power of the AC power supply device flows back to the AC power supply device after passing through the first coil, the first bridge arm and the bidirectional bridge arm, or the power of the AC power supply device passes through the The bidirectional bridge arm, the second bridge arm and the second coil flow back to the AC power supply device; In the fourth start-up stage, the controller controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm, so that the electrical energy of the AC power supply device passes through the The first coil, the first bridge arm and the bidirectional bridge arm then flow through the bus capacitor and flow back to the AC power supply device or make the power of the AC power supply device pass through the two-way bridge arm, the The bus capacitor, the second bridge arm, and the second coil flow back to the AC power supply device. 7. The energy conversion device according to claim 1, wherein when the battery is used as a power supply device, the working cycle of the driving and heating circuit includes a fifth working stage and a sixth working stage; the motor coil comprising a first coil and a second coil, the bridge arm converter includes a first bridge arm connected with the first coil and a second bridge arm connected with the second coil; In the fifth working stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm according to the to-be-driven power of the motor and the to-be-heated power of the motor coil, making the electric energy of the battery flow back to the battery after passing through the second bridge arm, the second coil, the first coil and the first bridge arm; In the sixth working stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm, and the electrical energy is A circulation is formed between a bridge arm and the second bridge arm. 8. The energy conversion device according to claim 1, wherein the motor coil, the bridge arm converter and the bus capacitor form a driving heating and discharging circuit; When the external charging and discharging port is connected to an external electrical device, the bridge arm is controlled according to the to-be-driven power of the motor, the to-be-charged power of the external electrical device, and the to-be-heated power of the motor coil The inverter allows the electric energy of the external battery to flow to the driving heating and discharging circuit, and adjusts the current of the driving heating and discharging circuit, so that the motor outputs driving power, charges the external electrical equipment, and causes the The motor coils consume electricity and generate heat at the same time. 9 . The energy conversion device according to claim 8 , wherein the working cycle of the driving heating and discharging circuit includes a seventh working stage and an eighth working stage; the motor coil includes a first coil and a second coil, 10 . The bridge arm converter includes a first bridge arm connected with the first coil and a second bridge arm connected with the second coil; In the seventh working stage, the controller controls the first bridge arm and the The turn-on time and duration of the second bridge arm make the electric energy of the battery flow back to the battery after passing through the second bridge arm, the second coil, the first coil and the first bridge arm , and at the same time make the electric energy flow back to the battery after passing through the second bridge arm, the second coil and the external electrical equipment; In the eighth working stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm, and the electrical energy is A circulating current is formed between a bridge arm and the second bridge arm, and at the same time, electric energy forms a circulating current between the second coil, the external electrical device and the second bridge arm. 10. An energy conversion device, characterized in that the energy conversion device comprises: motor; a vehicle-mounted charging module, including a charging connection terminal group, the charging connection terminal group including a first charging connection terminal and a second charging connection terminal; a motor control module, including a bridge arm converter, the bridge arm converter is connected to the motor coil of the motor; An energy storage module, comprising a bus capacitor connected in parallel and an energy storage connection terminal group, the bus capacitor is connected in parallel with the bridge arm converter, and the energy storage connection terminal group includes a first energy storage connection terminal, a second energy storage connection terminal connection end; a controller connected to the bridge arm converter; The motor coil, the bridge arm converter and the bus capacitor form a driving and heating circuit; According to the to-be-driven power of the motor and the to-be-heated power of the motor coil, the controller controls the bridge arm converter to make external electric energy flow to the driving and heating circuits, and adjusts the driving and heating circuits. The current is used to make the motor output driving power and at the same time make the motor coil actively consume electricity and generate heat to heat the battery. 11. The energy conversion device according to claim 10, wherein the first charging connection end and the second charging connection end are respectively connected to an external power source; The controller obtains the turn-on time and duration of the bridge arm converter, and adjusts the currents of the driving and heating circuits according to the turn-on time and duration, so that the motor outputs driving power while making the motor output drive power. The coil actively consumes electricity and generates heat to heat the battery. 12 . The energy conversion device according to claim 11 , wherein the external power source is a DC power supply device, and the working cycle of the driving and heating circuit includes a first working stage and a second working stage; the motor coil comprising a first coil and a second coil, the bridge arm converter includes a first bridge arm connected with the first coil and a second bridge arm connected with the second coil; In the first working stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm according to the to-be-driven power of the motor and the to-be-heated power of the motor coil, The electric energy of the DC power supply device flows back to the DC power supply device after passing through the first coil and the first bridge arm, and at the same time, the electric energy on the bus capacitor passes through the second bridge arm, the The second coil, the first coil and the first bridge arm flow back to the bus capacitor; In the second working stage, the controller controls the timing and duration of the conduction of the first bridge arm and the second bridge arm, and the electric energy of the DC power supply device passes through the first coil and the second bridge arm. A bridge arm then flows through the battery and the bus capacitor and flows back to the DC power supply device. A circulation is formed between the two bridge arms. 13 . The energy conversion device according to claim 10 , further comprising a bidirectional bridge arm, the bidirectional bridge arm is connected in parallel with the bridge arm converter, and the charging connection terminal group further comprises a third charging a connection end, the bidirectional bridge arm is further connected to the controller and the third charging connection end, and the third charging connection end is connected to an external power supply; The controller obtains the turn-on time and duration of the bridge arm converter, and adjusts the currents of the driving and heating circuits according to the turn-on time and duration, so that the motor outputs driving power while making the motor output drive power. The coil actively consumes electricity and generates heat to heat the battery. 14. The energy conversion device according to claim 13, wherein the external power source is an AC power supply device, and the working cycle of the driving and heating circuit includes a third working stage and a fourth working stage; In the third working stage, the controller controls the first bridge arm of the bridge arm converter, the second bridge arm of the bridge arm converter and the The conduction time and duration of the two-way bridge arm make the electric energy of the AC power supply device flow back to the AC power supply device after passing through the first coil, the first bridge arm and the two-way bridge arm, or to make the The electric energy of the AC power supply device flows back to the AC power supply device through the bidirectional bridge arm, the second bridge arm, and the second coil, and at the same time, the electric energy on the bus capacitor passes through the second bridge arm, the second bridge arm, and the second coil. The second coil, the first coil and the first bridge arm flow back to the bus capacitor; In the fourth working stage, the controller controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm, so that the electrical energy of the AC power supply device passes through the The first coil, the first bridge arm, and the bus capacitor flow through the two-way bridge arm and then flow back to the AC power supply device or make the power of the AC power supply device pass through the two-way bridge arm, the The bus capacitor, the second bridge arm, and the second coil flow back to the AC power supply device. A circulation is formed between the second bridge arms. 15. The energy conversion device according to claim 10, wherein when the battery is used as a power supply device, the duty cycle of the driving and heating circuit includes a fifth working stage and a sixth working stage; the motor coil comprising a first coil and a second coil, the bridge arm converter includes a first bridge arm connected with the first coil and a second bridge arm connected with the second coil; In the fifth working stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm according to the to-be-driven power of the motor and the to-be-heated power of the motor coil, making the electric energy of the battery flow back to the battery after passing through the second bridge arm, the second coil, the first coil and the first bridge arm; In the sixth working stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm, and the electrical energy is A circulation is formed between a bridge arm and the second bridge arm. 16. The energy conversion device according to claim 10, wherein the motor coil, the bridge arm converter and the bus capacitor form a driving heating and discharging circuit; When the first charging connection end and the second charging connection end are connected to an external electrical device, according to the to-be-driven power of the motor, the to-be-charged power of the external electrical device, and the standby power of the motor coil heating power, control the bridge arm converter to make the electric energy of the external battery flow to the driving heating and discharging circuit, and adjust the current of the driving heating and discharging circuit, so that the motor outputs driving power for the external use The electrical equipment is charged and the motor coils are consuming electricity to generate heat at the same time. 17. The energy conversion device according to claim 16, wherein the working cycle of the driving heating and discharging circuit comprises a seventh working stage and an eighth working stage; the motor coil comprises a first coil and a second coil, The bridge arm converter includes a first bridge arm connected with the first coil and a second bridge arm connected with the second coil; In the seventh working stage, the controller controls the first bridge arm and the The turn-on time and duration of the second bridge arm make the electric energy of the battery flow back to the battery after passing through the second bridge arm, the second coil, the first coil and the first bridge arm , and at the same time make the electric energy flow back to the battery after passing through the second bridge arm, the second coil and the external electrical equipment; In the eighth working stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm, and the electrical energy is A circulating current is formed between a bridge arm and the second bridge arm, and at the same time, electric energy forms a circulating current between the second coil, the external electrical device and the second bridge arm. 18. A vehicle, characterized in that the vehicle further comprises the energy conversion device of any one of claims 1 to 17.

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