CN207039262U - Power Conversion Devices, Charging Equipment and Swap Stations - Google Patents

Abstract

The utility model is related to electric and electronic technical field, a kind of power supply change-over device, charging equipment and electrical changing station be specifically provided, it is intended to solve charging equipment can not the charging of compatible single-phase alternating current and three-phase alternating current charging technical problem.For this purpose, the power supply change-over device of offer includes power conversion circuits and phase line switching circuit, the power conversion circuits are used to the alternating current of AC power output being converted to the available direct current of electrokinetic cell, the phase line switching circuit is used for the break-make for switching each road phase line between AC power and power conversion circuits, and control AC power exports many phase alternating current or single-phase alternating current to power conversion circuits.Simultaneously, there is provided charging equipment and electrical changing station may each comprise above-mentioned power supply change-over device.The technical solution of the utility model can carry out Power convert to single-phase alternating current and many phase alternating current.

Description

Power Conversion Devices, Charging Equipment and Swap Stations

technical field

The utility model relates to the technical field of power electronics, in particular to a power conversion device, charging equipment and a power station.

Background technique

Electric vehicles are powered by on-board power batteries and driven by electric motors. Among them, the charging process is an important part of the use of electric vehicles. The electric energy in the grid or energy storage equipment needs to be converted by the charging equipment to match the technical characteristics of the electric vehicle power battery to complete the charging.

Currently, charging equipment may include single-phase AC charging equipment and three-phase AC power transmission equipment. Among them, the charging power of the single-phase AC charging equipment is small, which is suitable for charging electric vehicles with a small power shortage or a long expected charging completion time. The charging power of the three-phase AC charging equipment is relatively large, and it is suitable for charging electric vehicles with a large power shortage or a short expected charging completion time. However, single-phase AC charging equipment and three-phase AC power transmission equipment are not compatible with each other, that is, single-phase AC charging equipment cannot use three-phase AC power to charge electric vehicles, and three-phase AC charging equipment cannot use single-phase AC power to charge electric vehicles. This not only reduces the practicability of the charging equipment, but also increases the manufacturing cost of the charging station.

Utility model content

In order to solve the above problems in the prior art, that is, to solve the technical problem that electric vehicle charging equipment cannot be compatible with single-phase AC charging and three-phase AC charging, the utility model provides a power conversion device, charging equipment and a power station.

In the first aspect, the technical solution of a power conversion device in the utility model is:

The power conversion device includes an energy conversion circuit and a phase line switching circuit; the input end of the energy conversion circuit is connected to the phase line switching circuit, and the output end is connected to the power battery;

The energy conversion circuit is used to convert the AC power output by the AC power supply into the DC power available for the power battery; the phase line switching circuit is used to switch the on-off of each phase line between the AC power supply and the energy conversion circuit, and control the AC power. The power supply outputs multi-phase alternating current or single-phase alternating current to the energy conversion circuit.

Further, a preferred technical solution provided by the utility model is:

The energy conversion circuit includes a plurality of AC/DC conversion units;

The AC input side of each AC/DC conversion unit is respectively connected to one phase line of the AC power supply; the DC output side of each AC/DC conversion unit is connected in parallel.

Further, a preferred technical solution provided by the utility model is:

The phase line switching circuit includes:

A toggle switch is used to turn on or off the phase line between the AC power supply and the energy conversion circuit;

The voltage acquisition unit is used to acquire the voltage of the power battery;

The control unit is used to control the switching action according to the voltage collected by the voltage collection unit.

Further, a preferred technical solution provided by the utility model is:

The control unit includes a microprocessor;

The microprocessor is configured to compare the voltage with a preset voltage threshold, and control the switching action according to the comparison result.

Further, a preferred technical solution provided by the utility model is:

The AC/DC conversion unit includes an AC/DC conversion circuit and a DC/DC conversion circuit;

The DC output side of the AC/DC conversion circuit in each AC/DC conversion unit is connected to the DC input side of the DC/DC conversion circuit through different DC bus bars.

Further, a preferred technical solution provided by the utility model is:

The DC/DC conversion circuit includes an LLC circuit and a BUCK circuit;

The input end of the LLC circuit is connected to the DC output side of the AC/DC conversion circuit, and the output end is connected to the input end of the BUCK circuit;

The output end of the BUCK circuit is the DC output side of the DC/DC conversion circuit.

Further, a preferred technical solution provided by the utility model is:

The energy conversion circuit in the power conversion device includes three AC/DC conversion units.

Further, a preferred technical solution provided by the utility model is:

The power conversion device also includes a water cooling radiator.

In the second aspect, the technical solution of a charging device in the utility model is:

The charging device includes a power supply interface and the power conversion device described in the above technical solution; the input end of the energy conversion circuit in the power conversion device is connected to the power supply interface.

In the third aspect, a technical solution for changing the power station in the utility model is:

The power exchange station includes a power battery charging position and the charging device described in the above technical solution; the charging device is set on the power battery charging position for charging the power battery

Compared with the prior art, the above technical solution has at least the following beneficial effects:

1. A power conversion device provided by the utility model includes an energy conversion circuit, a phase line switching circuit and a water cooling radiator. Among them, the energy conversion circuit includes a plurality of separate AC/DC conversion units, and each AC/DC conversion unit uses a different DC bus as a DC auxiliary power supply, which can not only perform power conversion for single-phase AC power, but also perform power conversion for multi-phase AC power. Power conversion; the phase-line switching circuit can switch the on-off of each phase line between the AC power supply and the energy conversion circuit according to the voltage of the power battery, and control the AC power supply to output multi-phase AC power or single-phase AC power to the energy conversion circuit; water-cooled radiator The heat dissipation efficiency of the power conversion device can be improved, and the heat dissipation noise can be reduced.

2. The utility model provides a charging device, which includes the power conversion device described in the above technical solution, and is compatible with single-phase AC charging and multi-phase AC charging.

3. The utility model provides a battery-swapping station, which includes the charging equipment described in the technical solution above, and is compatible with single-phase alternating current charging and multi-phase alternating current charging.

Description of drawings

Fig. 1 is a schematic diagram of a power conversion device in an embodiment of the present invention;

Fig. 2 is a schematic diagram of another power conversion device in the embodiment of the utility model;

Fig. 3 is a schematic diagram of an AC/DC conversion circuit;

FIG. 4 is a schematic diagram of another AC/DC conversion circuit;

Fig. 5 is a schematic diagram of a DC/DC conversion circuit;

FIG. 6 is a schematic diagram of another DC/DC conversion circuit;

7 is a schematic diagram of another DC/DC conversion circuit;

Fig. 8 is a schematic diagram of another DC/DC conversion circuit.

detailed description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the utility model, and are not intended to limit the protection scope of the utility model.

At present, the types of charging power sources set up in different charging places are relatively single. For example, residential buildings mainly set up single-phase AC charging facilities, and residential communities or charging stations mainly set up three-phase AC charging facilities. Therefore, the same charging place may not be able to meet the needs of different electric vehicles. At the same time, a large number of single-phase AC charging facilities and three-phase AC charging facilities are installed in the charging station, which will increase the construction and maintenance costs of the charging station. Based on this, the utility model provides a power conversion device, the power conversion device can not only convert the AC power output by the single-phase AC charging facility into the DC power that the electric vehicle can use, but also convert the multi-phase AC charging The alternating current output from the AC charging facility is converted into direct current that electric vehicles can use.

The power conversion device in the embodiment of the present invention will be described below with reference to the accompanying drawings.

The power conversion device in this embodiment may include an energy conversion circuit and a phase line switching circuit, the input end of the energy conversion circuit is connected to the phase line switching circuit, and the output end of the energy conversion circuit is connected to the power battery. Among them, the energy conversion circuit can be used to convert the AC power output by the AC power supply into the DC power available for the power battery, that is, the single-phase AC power output by the single-phase AC charging facility or the AC power included in the multi-phase AC charging facility, or multi-phase AC power. Phase alternating current is converted to direct current available to the power battery. The phase-line switching circuit can be used to switch the on-off of each phase line between the AC power supply and the energy conversion circuit, so as to control the AC power supply to output multi-phase AC power or single-phase AC power to the energy conversion circuit.

The multi-phase AC charging facility in this embodiment refers to a charging facility that can provide multi-phase AC power to the load. For example, the multi-phase AC charging facility may be a two-phase AC charging facility, and the output AC power is two-phase AC power. At the same time, the multi-phase AC charging facility can also be a three-phase AC charging facility, and the output AC power is a three-phase AC power.

Specifically, in this embodiment, the input end of the energy conversion circuit is connected to the AC power supply, and the output end is connected to the power battery. Wherein, the energy conversion circuit may include multiple AC/DC conversion units, the AC input side of each AC/DC conversion unit is connected to one phase line of the AC power supply, and the DC output sides of the multiple AC/DC conversion units are connected in parallel. In a preferred implementation provided by this embodiment, the energy conversion circuit may include three AC/DC conversion units.

Further, the AC/DC conversion unit in this embodiment may include an AC/DC conversion circuit and a DC/DC conversion circuit, the DC output side of the AC/DC conversion circuit in an AC/DC conversion unit, and the DC/DC conversion circuit The DC input sides are connected through different DC buses, that is, different DC buses are used as DC auxiliary power supplies in multiple AC/DC conversion units.

Figure 1 schematically shows the structure of a power conversion device in this embodiment, as shown in the figure, the power conversion device in this embodiment includes three AC/DC conversion units, and each AC/DC conversion unit includes An AC/DC conversion circuit and a DC/DC conversion circuit. At the same time, each AC/DC conversion unit in this embodiment uses a separate DC bus as the DC auxiliary power supply for the DC support capacitor between the DC output side of the AC/DC conversion circuit and the DC input side of the DC/DC conversion circuit .

The AC/DC conversion circuit in this embodiment can adopt various conventional types of AC/DC conversion circuits, specifically:

Figure 3 exemplarily shows an AC/DC conversion circuit structure, as shown in the figure, the AC/DC conversion circuit includes an inductor L11, an inductor L12, a diode D11, a diode D12, a power switch tube T11, a power switch tube T12 and DC support capacitor C11. The AC/DC conversion circuit can reduce the ripple of the input current under the condition of small input inductance, so the power level of the power conversion device can be improved when the AC/DC conversion circuit shown in FIG. 3 is used in this embodiment.

Figure 4 exemplarily shows another AC/DC conversion circuit structure, as shown in the figure, the AC/DC conversion circuit includes an inductor L21, an inductor L22, a diode D21, a diode D22, a diode D23, a diode D24, a diode D25, Diode D26, power switch tube T21, power switch tube T22, power switch tube T23, power switch tube T24 and DC support capacitor C2. The AC/DC conversion circuit has relatively small conduction loss of power electronic devices, so the conversion efficiency of the power conversion device can be significantly improved when the AC/DC conversion circuit shown in FIG. 4 is used in this embodiment.

In this embodiment, the DC/DC conversion circuit can adopt various conventional types of DC/DC conversion circuits, specifically:

Figure 5 exemplarily shows a structure of a DC/DC conversion circuit, as shown in the figure, the DC/DC conversion circuit includes an inductor L31, a diode D31, a diode D32, a diode D33, a diode D34, a power switch tube T31, a power switch Tube T32, DC support capacitor C31, capacitor C32, capacitor C33 and isolation winding. The DC/DC conversion circuit can use resonant soft switching technology to control the power electronic switch to realize power conversion. Therefore, this embodiment adopts the DC/DC conversion circuit shown in Figure 5, which can not only improve the conversion efficiency of the power conversion device, but also reduce Electromagnetic Interference in Small Power Conversion Devices.

Figure 6 exemplarily shows another DC/DC conversion circuit structure, as shown in the figure, the DC/DC conversion circuit includes an inductor L41, a diode D41, a diode D42, a diode D43, a diode D44, a power switch tube T41, a power Switch tube T42, power switch tube T43, power switch tube T44, DC support capacitor C41, capacitor C42 and isolation winding. The DC/DC conversion circuit can use resonant soft switching technology to control the power electronic switch to realize power conversion. Therefore, this embodiment adopts the DC/DC conversion circuit shown in Figure 6, which can not only improve the conversion efficiency of the power conversion device, but also reduce Electromagnetic Interference in Small Power Conversion Devices.

Figure 7 exemplarily shows another DC/DC conversion circuit structure, as shown in the figure, the DC/DC conversion circuit includes an inductor L51, an inductor L52, a diode D51, a diode D52, a power switch tube T51, and a power switch tube T52 and DC support capacitor C5. The DC/DC conversion circuit can have a small current ripple in the entire voltage range of the output voltage when the output voltage is required to have a wide voltage range, so this embodiment adopts the DC/DC conversion shown in Figure 6 The circuit can improve the life of the power battery.

FIG. 8 exemplarily shows another structure of a DC/DC conversion circuit. As shown in the figure, the DC/DC conversion circuit includes an LLC circuit and a BUCK circuit. Wherein, the input end of the LLC circuit is connected to the DC output side of the AC/DC conversion circuit, and the output end is connected to the input end of the BUCK circuit. The output end of the BUCK circuit is the DC output side of the DC/DC conversion circuit.

In this embodiment, when the DC/DC conversion circuit adopts the LLC circuit, the current ripple can have a small current ripple in a part of the output voltage range, but the current ripple cannot meet the preset current ripple condition in another part of the range. For example, when the LLC circuit works in BURST mode and the load is heavy, the current ripple of its output voltage will not meet the preset current ripple condition. At this time, a BUCK circuit can be connected to the output side of the LLC circuit. As shown in Figure 7, the output side of the BUCK circuit includes a filter circuit composed of inductors and capacitors, which can ensure that the DC/DC conversion circuit is at the entire voltage of its output voltage. The range is in a continuous working state, that is, the inductor current is a continuous current, and the current ripple will be small accordingly.

Assumption: the power level of the AC charging facility is 15kW, and the output voltage is 50V-500V. When the AC charging facility works at 200V-500V, the current ripple of the output voltage of the LLC circuit meets the preset current ripple conditions; when the AC charging facility works at 50V-200V, the current ripple of the LLC circuit output voltage does not meet the preset current Ripple condition, if the BUCK circuit is connected to the output side of the LLC circuit at this time, the current ripple of the power conversion device in the entire voltage range of the output voltage can meet the preset current ripple condition.

In a preferred implementation provided by this embodiment, in order to simplify the control process of the LLC circuit, its voltage/current control mode can be set as an open-loop operation mode, and the switching frequency of each power electronic device in the LLC circuit is related to the resonance of the LLC circuit The frequency is equal.

Further, the phase line switching circuit is connected to the input end of the energy conversion circuit. The phase-line switching circuit in this embodiment may include a switch, a voltage acquisition unit, and a control unit.

in:

In this embodiment, the switch can be used to turn on or off the phase line between the AC power supply and the energy conversion circuit, so as to connect the multi-phase AC power supply or the single-phase AC power supply to the energy conversion module. For example, the three-phase AC power supply can be connected to the energy conversion module by closing the switches of the three phase lines between the three-phase AC power supply and the energy conversion circuit. For another example, the single-phase AC power supply can be connected to the energy conversion module by closing the switch of any phase line between the three-phase AC power supply and the energy conversion circuit.

The voltage acquisition unit in this embodiment can be used to acquire the voltage of the power battery. Specifically, the voltage acquisition unit in this embodiment may use a voltage sensor, a voltage measurement module, and other instruments, or devices, or circuits for collecting voltage data.

In this embodiment, the control unit can be used to control the switching action according to the voltage collected by the voltage collection unit. Specifically, the control unit in this embodiment may include a microprocessor, which may be configured to compare the voltage with a preset voltage threshold, and control the switching action according to the comparison result. For example, when the power battery voltage is less than a certain voltage threshold or greater than a certain voltage threshold, any switching switch provided between the AC power supply and the energy conversion circuit can be controlled to close, so that the AC power supply outputs single-phase AC power to the power conversion device . For another example, when the voltage of the power battery is within a certain voltage threshold range, multiple switches arranged between the AC power supply and the energy conversion circuit may be controlled to be closed, so that the AC power supply outputs multi-phase AC power to the power conversion device.

It is assumed that this embodiment includes three voltage thresholds: a preset first voltage threshold and a preset second voltage threshold, and the first voltage threshold is smaller than the second voltage threshold.

When the voltage of the power battery is less than the first voltage threshold, firstly control any switching switch provided between the AC power supply and the energy conversion circuit to close, so that the AC power supply outputs single-phase AC power to the power conversion device, and then control the switch provided between the AC power supply and the energy conversion circuit All the switching switches between the energy conversion circuits are closed, so that the AC power supply outputs multi-phase AC power to the power conversion device.

When the voltage of the power battery is greater than the second voltage threshold, any switching switch provided between the AC power supply and the energy conversion circuit is controlled to be closed, so that the AC power supply outputs single-phase AC power to the power conversion device.

When the voltage of the power battery is between the first voltage threshold and the second voltage threshold, the plurality of switching switches arranged between the AC power supply and the energy conversion circuit are controlled to be closed, so that the AC power supply outputs multi-phase AC power to the power conversion device.

In a preferred embodiment provided by this embodiment, the control unit can also be an analog circuit including comparators, resistors and other electronic components. The analog circuit can control the switching action according to the voltage collected by the voltage acquisition unit, so that the AC power supply can supply The conversion circuit outputs single-phase alternating current or multi-phase alternating current.

Furthermore, the power conversion device in this embodiment may also include a water-cooled heat sink. Compared with the air-cooled heat dissipation method, the power conversion device adopts the water-cooled heat dissipation method to improve heat dissipation efficiency and reduce noise generated during the operation of the heat sink device.

FIG. 2 schematically shows another structure of a power conversion device in this embodiment. As shown in the figure, the water-cooled radiator in the power conversion device in this embodiment includes a water-cooling control system and a water-cooling substrate. Among them, the water cooling control system can be used to control the circulation of coolant. The water-cooled substrate can be used to arrange heat-generating elements that need to be dissipated in the power conversion device. As shown in Figure 2, the power conversion device performs power conversion on the grid power and outputs it to the vehicle-mounted terminal for charging. During the whole process, the water-cooled radiator dissipates heat from the power conversion device to ensure its normal operation.

In this embodiment, a plurality of separate AC/DC conversion units are arranged in the energy conversion circuit, and each AC/DC conversion unit uses a different DC bus as a DC auxiliary power supply, which can not only perform power conversion for single-phase AC power, but also Multiphase alternating current for power conversion. At the same time, the heat dissipation efficiency of the power conversion device can be improved and the heat dissipation noise can be reduced by arranging the water cooling radiator.

Based on the above embodiment of the power conversion device, the utility model also provides a charging device, which may include a power supply interface and the power conversion device described in the above embodiment of the power conversion device. Wherein, the input end of the energy conversion circuit in the power conversion device is connected to the power supply interface, and can convert the multi-phase alternating current or single-phase alternating current output through the power supply interface into direct current available for the power battery of the electric vehicle.

Based on the above embodiment of the charging device, the utility model also provides a power exchange station, which may include a power battery charging station and the charging device described in the above embodiment of the charging device. Among them, the charging equipment is set on the charging position of the power battery to charge the power battery, that is, the power station can convert the multi-phase alternating current or single-phase alternating current output by the AC power set at the charging position of the power battery into the power battery of the electric vehicle available direct current.

Those skilled in the art will understand that although some embodiments described herein include some features included in other embodiments but not others, the combination of features of different embodiments is meant to be within the scope of the present invention. and form different embodiments. For example, in the claims of the present utility model, any one of the claimed embodiments can be used in any combination.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.

So far, the technical solution of the utility model has been described in conjunction with the preferred implementations shown in the accompanying drawings, however, those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific implementations. On the premise of not departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the utility model.

Claims (10)

1. a kind of power supply change-over device, it is characterised in that including power conversion circuits and phase line switching circuit；The energy conversion The input of circuit is connected with the phase line switching circuit, and output end is connected with electrokinetic cell；

The power conversion circuits, the alternating current for AC power to be exported are converted to the available direct current of electrokinetic cell；Institute Phase line switching circuit is stated, for switching the break-make of each road phase line between AC power and power conversion circuits, controls AC power Many phase alternating current or single-phase alternating current are exported to power conversion circuits.

2. power supply change-over device according to claim 1, it is characterised in that

The power conversion circuits include multiple AC/DC converting units；

The exchange input side of each AC/DC converting units is connected with the phase line all the way of AC power respectively；Each AC/DC turns The DC output side for changing unit is in parallel.

3. power supply change-over device according to claim 1, it is characterised in that

The phase line switching circuit includes：

Switching switch, for the phase line being turned on or off between AC power and power conversion circuits；

Voltage acquisition unit, for gathering the voltage of electrokinetic cell；

Control unit, for the voltage gathered according to the voltage acquisition unit, control switching switch motion.

4. power supply change-over device according to claim 3, it is characterised in that

Described control unit includes microprocessor；

The microprocessor, voltage described in comparison and default voltage threshold are configured to, and are opened according to comparative result control switching Pass acts.

5. power supply change-over device according to claim 2, it is characterised in that

The AC/DC converting units include AC/DC change-over circuits and DC/DC change-over circuits；

The DC output side of AC/DC change-over circuits in each AC/DC converting units, inputted with the direct current of DC/DC change-over circuits Connected between side by different dc bus.

6. power supply change-over device according to claim 5, it is characterised in that

The DC/DC change-over circuits include LLC circuits and BUCK circuits；

The input of the LLC circuits is connected with the DC output side of AC/DC change-over circuits, output end and the input of BUCK circuits End connection；

The output end of the BUCK circuits is the DC output side of the DC/DC change-over circuits.

7. according to the power supply change-over device described in claim 1,2 or 5, it is characterised in that

Power conversion circuits include three AC/DC converting units in the power supply change-over device.

8. according to the power supply change-over device any one of claim 1-6, it is characterised in that

The power supply change-over device also includes water-filled radiator.

9. a kind of charging equipment, including power supply interface, it is characterised in that the charging equipment is included in claim 1-8 Power supply change-over device described in any one；The input of power conversion circuits and the power supply in the power supply change-over device Interface connects.

10. a kind of electrical changing station, including power battery charging position, it is characterised in that the electrical changing station is included described in claim 9 Charging equipment；The charging equipment is arranged on power battery charging position, for power battery charging.