CN111934447B

CN111934447B - Control method, device and system of wireless charging system and electric vehicle

Info

Publication number: CN111934447B
Application number: CN202010984396.3A
Authority: CN
Inventors: 胡锦敏; 梁立科; 侯延进; 何智
Original assignee: Shenzhen Hertz Innovation Technology Co ltd
Current assignee: Shenzhen Hertz Innovation Technology Co ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-02-09
Anticipated expiration: 2040-09-18
Also published as: CN111934447A

Abstract

The invention is suitable for the technical field of wireless charging, and provides a control method, a device and a system of a wireless charging system and an electric vehicle, wherein the method comprises the following steps: acquiring the total output power required by a wireless charging system, wherein the wireless charging system comprises N wireless transmission modules, each wireless transmission module comprises a transmitting module and a corresponding receiving module, and N is more than or equal to 1; calculating the output power of the receiving module according to the total output power; aiming at each wireless transmission module, calculating the transmitting power of a corresponding transmitting module according to a preset wireless transmission rule and output power; and controlling the working output transmitting power of the corresponding transmitting module so that the sum of the output powers of the N receiving modules meets the total output power. The transmitting module and the receiving module adopt modular design, each transmitting module and each receiving module can work independently, the total output power of the wireless charging system is met, capacity increasing or reducing design can be carried out on the modules according to actual conditions, and the design difficulty is reduced.

Description

Control method, device and system of wireless charging system and electric vehicle

Technical Field

The invention belongs to the technical field of wireless charging, and particularly relates to a control method, a control device and a control system of a wireless charging system and an electric vehicle.

Background

Wireless Power Transfer (WPT) is an ideal power supply method, has been rapidly developed with the advantages of high safety, large charging range, good controllability, etc., and is widely used for device power supplies, such as charging of electric vehicles.

For a high-power automobile wireless charging system, a plurality of receiving modules are generally required to output in parallel to achieve a larger power output, for example, the output power is 60kW, and a single receiving module outputs 15kW, four receiving modules are required to output in parallel. Correspondingly, the transmitting terminal usually adopts a form of one large coil or a plurality of transmitting coils, because the system output power is large, such as 60kW, the power of the power supply of the transmitting terminal needs more power, for example, the power of the transmitting terminal is 80kW, because a single transmitting module is difficult to provide the power output, such as the power supply of a single transmitting module is 20kW, usually a plurality of transmitting modules are adopted to implement, as shown in fig. 1, four transmitting module outputs are adopted to simultaneously supply power to a plurality of transmitting coils in parallel, so as to implement 80kW output, or as shown in fig. 2, four transmitting module outputs are adopted to parallelly supply power to a single large coil, so as to implement 80kW output.

However, the output of a plurality of transmitting modules is connected in parallel to form a main power supply for supplying power to the outside, the output voltage of a single transmitting module cannot be adjusted, and the output power of a single transmitting module cannot be adjusted, so that the received power of a single receiving module cannot be adjusted, the limitation is large, and the modules in the system are highly integrated, so that the modular design of the system is not facilitated, the capacity increasing or reducing design according to actual conditions is also not facilitated, the difficulty in adding or deleting the modules in the system is high, and the design difficulty and cost are improved; meanwhile, the abnormal module cannot be effectively cut off and replaced, and the safety and the reliability of the system are reduced.

Disclosure of Invention

The embodiment of the invention provides a control method of a wireless charging system, and aims to solve the problem that the existing wireless charging system is high in integration and not beneficial to modular design.

The embodiment of the invention is realized in such a way that a control method of a wireless charging system comprises the following steps:

acquiring the total output power required by a wireless charging system, wherein the wireless charging system comprises N wireless transmission modules, each wireless transmission module comprises a transmitting module and a corresponding receiving module, and N is more than or equal to 1;

calculating the output power of the receiving module according to the total output power;

aiming at each wireless transmission module, calculating the transmitting power of a corresponding transmitting module according to a preset wireless transmission rule and output power;

and controlling the working output transmitting power of the corresponding transmitting module so that the sum of the output powers of the N receiving modules meets the total output power.

Further, the step of calculating the output power of the receiving module according to the total output power comprises:

obtaining rated output power of a receiving module;

and calculating and confirming the quantity information of the receiving modules participating in the wireless power transmission and the output power of each receiving module according to the total output power and the rated output power.

Furthermore, after the step of controlling the corresponding transmitting module to output the transmitting power so that the sum of the output powers of the N receiving modules satisfies the total output power, the method further includes the following steps:

acquiring a charging current signal required by a target battery, wherein the charging power of the target battery is the total output power;

when the charging current signal is matched with a preset current threshold value, acquiring a charging power gear corresponding to the charging current signal;

and controlling the M transmitting modules to stop working according to the charging power gears, wherein M is more than or equal to 1 and less than or equal to N.

acquiring working parameters of a wireless transmission module, wherein the working parameters comprise voltage information, current information and transmission efficiency of a corresponding transmitting module and a corresponding receiving module;

judging whether the wireless transmission module works abnormally according to the voltage information, the current information and the transmission efficiency;

and if so, turning off the abnormal wireless transmission module and generating module abnormal alarm information.

Furthermore, after the step of controlling the operation output transmission power of the corresponding transmission module, the method further comprises the following steps:

acquiring a preset phase data list, wherein the phase data list comprises phase information of N transmitting modules;

and setting the phase difference of the driving signals of the N transmitting modules according to the phase information so that the phase difference exists between the output voltage signals of two adjacent transmitting modules.

acquiring a signal frequency range of a preset driving signal of a transmitting module;

controlling the driving signal to continuously change in a signal frequency range, and recording the output power of the corresponding receiving module;

the frequency of the target signal at which the output power reaches a maximum is extracted as the frequency of the drive signal.

In a second aspect, the present application further provides a control device of a wireless charging system, the device including:

the wireless charging system comprises N wireless transmission modules, wherein each wireless transmission module comprises a transmitting module and a corresponding receiving module, and N is more than or equal to 1;

the output power calculation unit is used for calculating the output power of the receiving module according to the output total power;

the transmitting power calculating unit is used for calculating the transmitting power of the corresponding transmitting module according to a preset wireless transmission rule and output power aiming at each wireless transmission module;

and the transmitting control unit is used for controlling the working output transmitting power of the corresponding transmitting module so that the sum of the output powers of the N receiving modules meets the total output power.

Further, the output power calculating unit includes:

a rated power obtaining subunit, configured to obtain a rated output power of the receiving module;

and the output power calculating subunit is used for calculating and confirming the quantity information of the receiving modules participating in the wireless power transmission and the output power of each receiving module according to the total output power and the rated output power.

Still further, the apparatus further comprises:

the current acquisition unit is used for acquiring a charging current signal required by a target battery, wherein the charging power of the target battery is the total output power;

the gear determining unit is used for acquiring a charging power gear corresponding to the charging current signal when the charging current signal is matched with a preset current threshold;

and the work control unit is used for controlling the M transmitting modules to stop working according to the charging power gears, wherein M is more than or equal to 1 and less than or equal to N.

Still further, the apparatus further comprises:

the wireless transmission module comprises a parameter acquisition unit, a parameter comparison unit and a parameter comparison unit, wherein the parameter acquisition unit is used for acquiring working parameters of the wireless transmission module, and the working parameters comprise voltage information, current information and transmission efficiency of a corresponding transmitting module and a corresponding receiving module;

the abnormality judgment unit is used for judging whether the wireless transmission module works abnormally according to the voltage information, the current information and the transmission efficiency;

and the abnormity processing unit is used for turning off the abnormal wireless transmission module and generating module abnormity alarm information if the judgment result is yes.

Still further, the apparatus further comprises:

the phase acquisition unit is used for acquiring a preset phase data list, wherein the phase data list comprises phase information of N transmitting modules;

and the phase setting unit is used for setting the phase difference of the driving signals of the N transmitting modules according to the phase information so as to enable the phase difference to exist between the output voltage signals of two adjacent transmitting modules.

Still further, the apparatus further comprises:

the frequency acquisition unit is used for acquiring a signal frequency range of a preset driving signal of the transmitting module;

the frequency recording unit is used for controlling the driving signal to continuously change in a signal frequency range and recording the output power of the corresponding receiving module;

and a frequency extraction unit for extracting a target signal frequency at which the output power reaches a maximum as a frequency of the driving signal.

In a third aspect, the present application further provides a wireless charging system, including:

the transmitting end comprises a transmitting communication assembly and N transmitting modules, the transmitting communication assembly is in communication connection with the N transmitting modules, and the transmitting modules are provided with transmitting coils;

the receiving end comprises a receiving assembly, a receiving communication assembly and N receiving modules, the receiving communication assembly is in communication connection with the N receiving modules, the receiving modules are provided with receiving coils corresponding to the transmitting coils, and the receiving assembly is connected with the N receiving modules and used for collecting and outputting the output power of the N receiving modules to an external load;

the wireless charging system adopts the control method to control the transmitting power of the transmitting module, so that the total output power of the N receiving modules meets the total output power of the wireless charging system.

In a fourth aspect, the present application further provides an electric vehicle including the wireless charging system as described above.

The embodiment of the application obtains the total output power required by the wireless charging system, the wireless charging system comprises a plurality of wireless transmission modules, each wireless transmission module comprises a transmitting module and a receiving module, the system calculates the output power of the receiving module according to the total output power so as to calculate the transmitting power of the transmitting module, the transmitting module is controlled to work so that the total output power of the receiving modules meets the total output power of the wireless charging system, the transmitting module and the receiving module adopt a modular design, and each transmitting module and each receiving module can work independently, thereby the output power of each receiving module can be independently adjusted to meet the total output power of the wireless charging system, in addition, the transmitting module and the receiving module which are in modular design can perform capacity increasing or reducing design on the modules according to actual conditions, so that the design difficulty is reduced, and the actual use requirements are better met; in addition, the abnormal module can be independently turned off, and the safety and the reliability of the system are improved.

Drawings

Fig. 1 is a schematic structural diagram of parallel connection of transmitting modules in a wireless charging system provided in the prior art;

fig. 2 is a schematic diagram of a wireless charging system provided by the prior art, in which a single large coil is used;

fig. 3 is a basic flowchart of a control method of a wireless charging system according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a wireless charging system according to an embodiment of the present application;

FIG. 5 is a basic flow diagram for calculating the output power of a receiving module according to one embodiment of the present invention;

FIG. 6 is a schematic flow chart illustrating the operation of a control section of a transmitter module according to an embodiment of the present application;

fig. 7 is a schematic flowchart illustrating an abnormality detection of a wireless charging module according to an embodiment of the present application;

FIG. 8 is a flow chart illustrating controlling phase difference of output currents according to an embodiment of the present application;

FIG. 9 is a basic flow chart for calculating an optimal driving signal frequency according to one embodiment of the present application;

fig. 10 is a block diagram of a control device of a wireless charging system according to an embodiment of the present application;

fig. 11 is a block diagram of an output power calculation unit of a control device of a wireless charging system according to an embodiment of the present application;

fig. 12 is a block diagram illustrating an embodiment of a control device of the wireless charging system provided herein;

fig. 13 is a block diagram illustrating another embodiment of a control device of the wireless charging system provided herein;

fig. 14 is a block diagram illustrating a control device of a wireless charging system according to still another embodiment of the present disclosure;

fig. 15 is a block diagram illustrating a driving signal frequency set by an embodiment of a control device of the wireless charging system according to the present application;

fig. 16 is a schematic structural diagram of a track-based application of the wireless charging system according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The traditional scheme adopts a plurality of power module outputs to be connected in parallel to realize high-power output, and because the plurality of power module outputs are connected in parallel to form a main power supply to supply power externally, the power integration is high, the modular design is not facilitated, and the capacity increasing or reducing design is not facilitated according to the actual situation. The system calculates the output power of the receiving module according to the output total power so as to calculate the transmitting power of the transmitting module, controls the transmitting module to work so that the total output power of the receiving modules meets the output total power of the wireless charging system, adopts a modular design for the transmitting module and the receiving module, can work independently for each transmitting module and each receiving module, can independently adjust the output power of each receiving module, meets the output total power of the wireless charging system, and can increase or reduce the capacity of the modules according to actual conditions so as to reduce the design difficulty; and the abnormal module can be independently turned off, so that the safety and the reliability of the system are improved.

Example one

In some optional embodiments, please refer to fig. 3, and fig. 3 is a flowchart illustrating a control method of a wireless charging system according to an embodiment of the present disclosure.

As shown in fig. 3, a first aspect of the present application provides a control method for a wireless charging system, including:

s1100, acquiring the total output power required by a wireless charging system, wherein the wireless charging system comprises N wireless transmission modules, each wireless transmission module comprises a transmitting module and a corresponding receiving module, and N is more than or equal to 1;

in implementation, the wireless charging system includes a receiving end and a transmitting end, where the receiving end includes N receiving modules, the transmitting end includes N transmitting modules, one transmitting module and one receiving module are arranged in pair to form a wireless transmission module, output power of the receiving module is used to charge a battery or a battery pack, total output power required by the wireless charging system is a sum of output powers of all the receiving modules, the wireless charging system needs to satisfy charging power of the battery or the battery pack, for example, charging power of the battery is 60kW (kilowatt), total output power required by the wireless charging system is 60kW, and in implementation, the wireless charging system is connected with the battery management system, so that charging power required by the battery can be obtained from the battery management system, and the charging power is used as total output power required by the wireless charging system.

S1200, calculating the output power of the receiving module according to the total output power;

in implementation, the system calculates the total output power and the number of the receiving modules, so as to calculate the output power of each receiving module, where the total output power is 60kW for example, and the wireless charging system includes 3 receiving modules, which requires the output power of each receiving module to be 20 kW.

S1300, aiming at each wireless transmission module, calculating the transmitting power of the corresponding transmitting module according to a preset wireless transmission rule and output power;

the receiving module and the transmitting module are arranged in pairs in the wireless charging system to form a wireless transmission module, the receiving module is provided with a receiving coil, the transmitting module is provided with a transmitting coil, the paired transmitting coil and the receiving coil are not electrically connected, the transmitting end is provided with a transmitting communication assembly, the transmitting communication assembly is in communication connection with N transmitting modules, the receiving end is provided with a receiving communication assembly, the receiving communication assembly is in communication connection with N receiving modules, the transmitting communication assembly is in communication connection with the receiving communication assembly, and information is transmitted.

In some embodiments, taking the example that the transmitting end is provided with 4 transmitting modules, the transmitting module includes a transmitting module 1, a transmitting module 2, a transmitting module 3 and a transmitting module 4; the receiving end is correspondingly provided with 4 receiving modules, including a receiving module 1, a receiving module 2, a receiving module 3 and a receiving module 4; wherein, emission module 1 and receiving module 1 dock, emission module 2 and receiving module 2 dock, emission module 3 and receiving module 3 dock, emission module 4 and receiving module 4 dock, when wireless charging system's output total power is 60kW, then need receiving module 1, receiving module 2, receiving module 3 and receiving module 4's output to be 15kW, under the condition that does not consider that wireless transmission in-process appears the power damage, the transmission power that obtains emission module 1, emission module 2, emission module 3 and emission module 4 is 15kW by the calculation.

In other optional embodiments, power loss may occur during wireless transmission, and the principle of the wireless transmission rule is that a power expected to be lost is added to the output power of the receiving module as the transmission power of the transmitting module, for example, the transmission power of the transmitting module 1, the transmitting module 2, the transmitting module 3, and the transmitting module 4 needs to exceed 15kW (e.g., 15.5kW, 16, 16.5 kW, 17 kW, etc.) to enable the output power of the receiving module to be 15kW, in implementation, the power expected to be lost may be obtained by a transmission loss meter between the transmitting module and the receiving module, for example, a receiving end continuously detects the actual output power of the receiving module through a receiving communication assembly, and adjusts and increases the output power of the transmitting module 1 according to the output power until the receiving module outputs 15kW, at this time, an actual power difference between the actual transmission power of the transmitting module 1 and the output power of the receiving module is the expected power, which is the actual power difference between the actual transmission power of Measuring the power loss; in other embodiments, the actual power difference value in the preset time period or the transmission times may be averaged, for example, the actual power difference value of 1 ten thousand times of wireless power transmission is counted and averaged to be the power expected to be lost.

And S1400, controlling the corresponding transmitting module to output the transmitting power so that the sum of the output powers of the N receiving modules meets the total output power.

The system controls the corresponding transmitting module to output the transmitting power according to the calculated transmitting power, so that the sum of the output powers of all the receiving modules is equal to the total output power of the wireless charging system, taking the example that a receiving end of the wireless charging system is connected with a battery to charge the battery, the output power of the receiving module can be preset, taking the example that the control method of the wireless charging system is applied to the wireless charging system with specific charging power, for example, the wireless charging system can only butt against the battery with charging power of 40kW, the output power of each receiving module in the system is (40/N) kW, wherein N is the number of the receiving modules in the wireless charging system, and taking N as 2 as an example, the output power of each receiving module is 20 kW.

In other alternative embodiments, the system may also set the output power of the receiving module according to the actual charging power of the battery, for example, when the wireless charging system is connected to the battery, the system is communicatively connected to a BMS (battery management system), i.e. the charging power required by the battery can be obtained by the BMS

Handle bar

Is distributed to N receiving modules, and the output power of each receiving module is respectively

，

，

…

Satisfy the following requirements

And during charging, the system acquires and calculates the transmitting power of the corresponding transmitting module according to the output power of each receiving module, and controls the transmitting modules to work and output the transmitting power, so that each transmitting module outputs the appointed transmitting power, and the corresponding receiving module can realize the appointed output power.

In some optional embodiments, please refer to fig. 4, fig. 4 is a schematic structural diagram of a wireless charging system in an embodiment of a control method of the wireless charging system, as shown in fig. 4, the wireless charging system includes a transmitting end and a receiving end, the transmitting end includes a transmitting communication assembly and N transmitting modules, specifically includes a transmitting module 1, a transmitting module 2, and a transmitting module 3 …, the transmitting communication assembly is in communication connection with each transmitting module, and each transmitting module is correspondingly provided with a transmitting coil, that is, includes the transmitting coil 1, the transmitting coil 2, and the transmitting coil 3 …; the receiving end comprises a receiving assembly, a receiving communication assembly and N receiving modules, and specifically comprises a receiving module 1, a receiving module 2 and a receiving module 3 … receiving module N, the receiving communication assembly is in communication connection with each receiving module, each receiving module is correspondingly provided with a receiving coil, namely the receiving coil 1, the receiving coil 2 and the receiving coil 3 … receiving coil N, and the receiving communication assembly is in communication connection with the transmitting communication assembly; in practice, the receiving module 1 needs to provide

For example, the receiving module 1 corresponds to the transmitting module 1, and the transmitting module 1 needs to output power of

I.e. the transmission power of the transmission module 1 is

Then transmitting the communication assembly andthe transmitting module 1 communicates so as to be dependent on the output power of the receiving module 1

The target power of the transmitting module 1 is made to be

Or the receiving communication assembly and the transmitting communication assembly carry out multiple communications, so that the transmitting module 1 finally realizes the output power

。

Similarly, the transmitting module 1, the transmitting module 2, and the transmitting module 3 … correspond to the receiving module 1, the receiving module 2, and the receiving module 3 …, respectively, and the transmitting module 1, the transmitting module 2, and the transmitting module 3 … respectively output the transmitting module n under the control of the transmitting communication assembly

，

，

…

At this time, the receiving module 1, the receiving module 2, and the receiving module 3 … respectively implement the receiving module n

Output of

，

，

…

If the total power of the assembly is received, the power of the battery is realized

And (6) charging.

In some embodiments, the transmitting power of the transmitting coil is affected by many factors, such as the degree of alignment between the receiving coil and the transmitting coil, and the vertical distance between the transmitting coil and the receiving coil, which affect the transmission power between the transmitting module and the receiving module, and if the output power of the receiving coil is 15kw, the transmitting power of the transmitting coil may be 15.5kw, or 16kw, or 17.5kw, and in practice, the output power of the receiving module may be continuously monitored by means of primary and secondary closed-loop communication formed by the transmitting communication assembly and the receiving communication assembly, and the transmitting power of the transmitting module is adjusted until the output power of the receiving module is 15kw, and the principle of the wireless transmission rule is: the receiving communication assembly obtains the required output total power from the BMS and distributes the required output total power to each receiving module, then the output power information required by each receiving module is transmitted to the transmitting communication assembly, and after the transmitting communication assembly obtains the information transmitted by the receiving communication assembly, the transmitting communication assembly controls the working output power of the corresponding transmitting module to realize that the corresponding receiving module outputs the specified power.

In other embodiments, the transmit power of the transmit module has different algorithms for different topologies. For example, in the LCC-LCC topology, the receiving module output current I = the transmitting module output voltage U × coefficient, where the coefficient is related to the compensation parameter and the coupling parameter. The actual control quantity of the transmitting terminal is the output voltage of the transmitting module, and the distance, the angle, the coupling parameters and the like between the transmitting module and the receiving module are different, so that the wireless transmission efficiency between the transmitting module and the receiving module is also different, and the principle of the wireless transmission rule is as follows: for each wireless transmission module, calculating the wireless transmission efficiency of the wireless transmission module, and then calculating and adjusting the sending power of the transmitting module by the wireless transmission efficiency, wherein the wireless transmission efficiency calculation formula is as follows: wireless transmission efficiency = output power of the receiving module/transmission power of the transmitting module. The wireless transmission efficiency can be tested in advance and then stored in a memory, the power of the transmitting module and the power of the receiving module can be monitored and calculated in real time, then the actual transmitting power of the transmitting module can be calculated by using the wireless transmission efficiency and the output power required by the receiving module, and the transmitting power of the transmitting module is controlled in real time to finally realize the appointed output power of the receiving module.

In practice, the above description with the power of the receiving module as the adjustment amount is an exemplary adjustment process in this application, and for different types of wireless charging topologies, the receiving module may have different adjustment amounts, such as adjusting the output current and the output voltage of the receiving module.

For the transmitting module and the transmitting communication assembly, the transmitting module is not directly controlled to output a certain power, but indirectly controlled to output a specified output power, voltage or current by controlling other parameters in the transmitting module. For example, in the LCC-LCC topology, the transmitting module comprises three basic structures of AC/DC, DC/AC and compensation topology. The control variables of the transmitting module can be AC/DC output voltage, DC/AC phase shift angle, DC/AC duty ratio, compensation topology parameters, driving frequency and the like, and no matter which parameter of the transmitting module is adjusted by the transmitting communication assembly, the output current of the receiving module can be adjusted. If the receiving assembly requires the receiving module to provide 10A of current, the end result of the adjustment is that the receiving module achieves a 10A current output.

In other embodiments, the inversion voltage, the phase shift, the compensation parameters, etc. in each transmitting module can be controlled to be fixed, i.e. the primary side is not adjusted. Instead, in the receiving module, the output power is adjusted individually, and the receiving module is adjusted individually to achieve the 10A output current.

Any way of implementing the adjustment of the output power based on the above structure is within the scope of this patent.

The method comprises the steps that the total output power required by the wireless charging system is obtained, the wireless charging system comprises a plurality of wireless transmission modules, each wireless transmission module comprises a transmitting module and a receiving module, the system calculates the output power of the receiving module according to the total output power and then calculates the transmitting power of the transmitting module, the transmitting module is controlled to work so that the total output power of the receiving modules can meet the total output power of the wireless charging system, the transmitting module and the receiving module are in a modular design, each transmitting module and each receiving module can work independently, the output power of each receiving module can be adjusted independently, the total output power of the wireless charging system is met, in addition, the transmitting module and the receiving module which are in the modular design can be subjected to capacity increasing or reducing design according to actual conditions, and the design difficulty is reduced; and the abnormal module can be independently turned off, so that the safety and the reliability of the system are improved.

Example two

In some alternative embodiments, please refer to fig. 5, fig. 5 is a schematic diagram of a basic flow chart of calculating the output power of the receiving module according to an embodiment of the present application.

As shown in fig. 5, the step of calculating the output power of the receiving module according to the total output power includes:

s1210, obtaining rated output power of a receiving module;

and S1220, calculating and confirming the number information of the receiving modules participating in the wireless power transmission and the output power of each receiving module according to the total output power and the rated output power.

In implementation, the rated output power is the maximum output power under the normal working condition of the receiving module, the system calculates the number of the receiving modules participating in the wireless power transmission and the output power of each receiving module according to the total output power and the rated output power, in some optional embodiments, the receiving end can meet the total output power only by using part of the receiving modules, for example, the charging power of the target battery is 50kW, and the receiving end includes the receiving module 1, the receiving module 2 and the receiving module 3, wherein the rated output power of each receiving module is 30kW, the calculation is performed according to the charging power and the rated output power, it is determined that the receiving module 1 and the receiving module 2 participate in the wireless power transmission, and the charging requirement of the target battery can be met only by outputting 30kW by the receiving module 1 and outputting 20kW by the receiving module 2.

EXAMPLE III

In some alternative embodiments, please refer to fig. 6, fig. 6 is a basic flowchart of an embodiment of the present application for controlling a part of a transmitting module to stop working.

As shown in fig. 6, after the step of controlling the corresponding transmitting module to output the transmitting power so that the sum of the output powers of the N receiving modules satisfies the total output power, the method for controlling the wireless charging system further includes the following steps:

s1510, acquiring a charging current signal required by a target battery, wherein the charging power of the target battery is the total output power;

in implementation, in the charging process of the target battery, as the electric quantity is gradually charged, the charging power is reduced, that is, the charging current required by the target battery is also reduced, and the system monitors the charging current signal required by the target battery in real time through the BMS.

S1520, when the charging current signal is matched with a preset current threshold value, acquiring a charging power gear corresponding to the charging current signal;

s1530, controlling the M transmitting modules to stop working according to the charging power gear, wherein M is larger than or equal to 1 and is smaller than or equal to N.

When the wireless transmission module is implemented, in the later stage of battery charging, the charging current required by the battery is reduced, at the moment, part of the transmitting modules can be turned off, and when the transmitting modules are turned off, the output power of the receiving module in the same wireless transmission module is zero. Taking the current reduction in the later charging period of the battery as an example, the system acquires a charging current signal required by the target battery, and compares the charging current signal with a preset current threshold value, so as to determine the current required charging power gear of the target battery, for example, the wireless charging system comprises N wireless charging modules, and when the target battery starts to be charged, the system starts all the wireless charging modules, namely, the transmitting modules 1 to N and the receiving modules 1 to N are turned on; and in the later stage of charging the target battery, the charging current required by the target battery is reduced, at the moment, the system matches a charging power gear according to the charging current, and controls the plurality of transmitting modules to stop working according to the charging power gear, for example, the transmitting modules 2 to n are turned off, only the transmitting module 1 is turned on, at the moment, only the transmitting module 1, the transmitting coil 1, the receiving coil 1 and the receiving module 1 work to charge the target battery at a low current, and other modules are turned off, so that the working loss of the system can be effectively reduced, and the charging efficiency is improved.

Example four

In some optional embodiments, please refer to fig. 7, and fig. 7 is a basic flowchart of the wireless charging module abnormality detection according to an embodiment of the present application.

As shown in fig. 7, after the step of controlling the corresponding transmitting module to output the transmitting power so that the sum of the output powers of the N receiving modules satisfies the total output power, the method for controlling the wireless charging system further includes the following steps:

s1610, obtaining working parameters of the wireless transmission module, wherein the working parameters comprise voltage information, current information and transmission efficiency of the corresponding transmitting module and receiving module;

in implementation, each transmitting module and each receiving module can be detected to judge whether the modules are abnormal or not, the modules with abnormal work are intelligently cut off and alarmed, and the system monitors working parameters of the wireless transmission module, including but not limited to voltage information and current information of the transmitting modules, voltage information and current information of the receiving modules, transmission efficiency between the paired transmitting modules and receiving modules and the like.

S1620, judging whether the wireless transmission module works abnormally according to the voltage information, the current information and the transmission efficiency;

in implementation, when the wireless transmission module works abnormally, that is, when the transmitting module or the receiving module is abnormal, the wireless transmission efficiency of the wireless charging system is low, and then the voltage information and the current information of the transmitting module, the voltage information and the current information of the receiving module, and the transmission efficiency between the paired transmitting module and receiving module are abnormal, for example, the wireless charging system includes a plurality of transmitting modules and a plurality of receiving modules, and when the transmitting module or the receiving module in any one of the wireless transmission modules is abnormal, the voltage information, the current information, and the transmission efficiency of the wireless transmission module are different from those of other wireless transmission modules.

S1630, if the judgment result is yes, the abnormal wireless transmission module is turned off and module abnormal alarm information is generated.

When the system judges that the wireless transmission module is abnormal, the wireless transmission module is turned off, for example, the transmitting module is turned off and module abnormal alarm information is sent, taking the case that the wireless charging system comprises 5 wireless transmission modules, the 5 wireless transmission modules comprise a transmitting module 1, a transmitting module 2, a transmitting module 3, a transmitting module 4, a transmitting module 5, a receiving module 1, a receiving module 2, a receiving module 3, a receiving module 4 and a receiving module 5, the wireless transmission modules 1 to 4 work to carry out wireless power transmission, and the system detects working parameters of each wireless charging module, such as voltage information and current information of the monitoring transmitting module; monitoring voltage information and current information of a receiving module; and monitoring the transmission efficiency between the transmitting module and the receiving module, and the like to judge whether the modules are abnormal. If the working parameter data of a wireless transmission module is abnormal, for example, the efficiency of the transmitting module, transmitting coil, receiving coil and receiving module of the wireless transmission module 1 is lower than that of other groups, or the working state of the transmitting module is the same, and the output power of the receiving module is obviously lower, the wireless transmission module 1 is judged to be abnormal, the power supply of the wireless transmission module 1 is cut off in the system, for example, the input relay of the transmitting module of the wireless transmission module 1 can be cut off, the operation of the core power device of the transmitting module can be stopped by the relay or switch in the transmitting module, or the driving circuit in the transmitting module is closed, or the receiving module of the wireless transmission module 1 is closed, so that the wireless transmission module 1 stops working, when the wireless transmission module 1 is closed, other idle modules can be opened for replacement, for example, the wireless transmission module 5 is opened, the wireless transmission efficiency is improved, and the safety and the reliability of the system are improved.

EXAMPLE five

In some alternative embodiments, please refer to fig. 8, fig. 8 is a basic flowchart of controlling the phase difference of the output currents according to an embodiment of the present application.

As shown in fig. 8, after the step of controlling the corresponding transmitting module to output the transmitting power, the method for controlling the wireless charging system further includes the following steps:

s1710, acquiring a preset phase data list, wherein the phase data list comprises phase information of N transmitting modules;

and S1720, setting phase differences of driving signals of the N transmitting modules according to the phase information, so that phase differences exist between output voltage signals of two adjacent transmitting modules.

In implementation, in order to reduce the output voltage or current ripple of the receiving modules connected in parallel, a clock synchronization signal may be added to the wireless charging system to control the phase difference of the operation of each transmitting module. The phase data table comprises phase information of each transmitting module, the phase data table can be stored in a local database, the phase data table can be obtained by accessing the local database, and the system correspondingly sets the phase difference of the driving signals of each transmitting module according to each phase information in the phase data table. For the transmission modules 1,2,3 … n, the phase difference of the inverted driving signals in each transmission module is controlled to be 360 °/n. With the same clock signal reference, the phase of the driving signal in the transmitting module 1 is 0 °, the phase difference of the driving signal in the transmitting module 2 is 360 °/n, the phase of the driving signal in the transmitting module 3 is 2 × (360 °/n), …, and the phase difference of the driving signal in the transmitting module n is (n-1) × (360 °/n).

Taking six transmitting modules as an example, the phase differences of the inversion driving signals in the transmitting modules 1 to 6 are 0 °, 60 °, 120 °, 180 °, 240 °, and 300 ° in sequence. The phase differences corresponding to the input currents of the receiving modules 1 to 6 are 0 °, 60 °, 120 °, 180 °, 240 ° and 300 ° in sequence, and after the output currents of the receiving modules are connected in parallel, because the phase differences exist at the current peak time, the situation that the peak currents are superposed at the same time can not occur, so that the ripple of the output currents can be effectively reduced, the ripple coefficient of the total current output by the receiving modules is reduced, the difficulty of system design is reduced, and the stability and reliability of the system are improved.

EXAMPLE six

In some alternative embodiments, please refer to fig. 9, fig. 9 is a basic flowchart of calculating an optimal driving signal frequency according to an embodiment of the present application.

As shown in fig. 9, after the step of controlling the corresponding transmitting module to output the transmitting power, the method for controlling the wireless charging system further includes the following steps:

s1810, acquiring a preset signal frequency range of a driving signal of the transmitting module;

s1820, controlling the driving signal to continuously change in the signal frequency range, and recording the output power of the corresponding receiving module;

s1830, a target signal frequency at which the output power reaches a maximum is extracted as the frequency of the drive signal.

In implementation, due to the inductance deviation of the transmitting coil and the receiving coil, the optimal operating frequencies of the transmitting module, the transmitting coil, the receiving coil and the receiving module in each wireless charging module may be different, for example, the optimal operating frequency point of the transmitting module 1 is 85kHz, and the optimal operating frequency point of the transmitting module 2 is 85.5 kHz.

The system controls the frequency rule change of the driving signal of the transmitting module, for example, in the initial operating stage of the system, the transmitting module outputs very small power, the frequency of the inversion driving signal in the transmitting module is continuously adjusted, the system acquires the output power of the receiving module in real time, records the frequency of the driving signal as the target signal frequency when the output power of the receiving module is maximum, the target signal frequency is the optimal frequency, and the target signal frequency is used as the frequency of the driving signal of the transmitting module, so that each transmitting module is controlled to work at the optimal frequency, and the transmission efficiency and the output power of the wireless charging system are improved.

In some embodiments, the driving signal frequency of the transmitting module may also be adjusted according to the optimal frequency of each wireless charging module, for example, when it is detected that the frequency of the driving signal is a when the target power of the transmitting module 1 is maximum, the frequency of the driving signal is B when the target power of the transmitting module 2 is maximum, and the frequency of the driving signal is C when the target power of the transmitting module 3 is maximum, the driving signal frequencies of the transmitting modules 1,2, and 3 may be controlled to be A, B and C, respectively, so as to improve the output power and the transmission efficiency of the wireless charging system.

EXAMPLE seven

In some optional embodiments, please refer to fig. 10 in some optional embodiments, and fig. 10 is a schematic block diagram of an embodiment of a control device of a wireless charging system according to the present application.

As shown in fig. 10, the present application also provides a control apparatus of a wireless charging system, the apparatus including a total power obtaining unit 2100, an output power calculating unit 2200, a transmission power calculating unit 2300, and a transmission control unit 2400.

The total power obtaining unit 2100 is configured to obtain total output power required by the wireless charging system, where the wireless charging system includes N wireless transmission modules, each wireless transmission module includes a transmitting module and a corresponding receiving module, and N is greater than or equal to 1;

the output power calculating unit 2200 is configured to calculate the output power of the receiving module according to the total output power;

the transmission power calculation unit 2300 is configured to calculate, for each wireless transmission module, a transmission power of a corresponding transmission module according to a preset wireless transmission rule and an output power;

the transmission control unit 2400 is configured to control the corresponding transmitting module to output the transmitting power, so that the sum of the output powers of the N receiving modules satisfies the total output power.

This application is through obtaining the required output total power of wireless charging system, this wireless charging system includes a plurality of wireless transmission modules, every wireless transmission module includes transmitting module and receiving module, the system calculates the output of receiving module and then calculates the transmitting power of transmitting module according to the output total power, control transmitting module work so that the output total power sum of a plurality of receiving module satisfies the output total power of wireless charging system, transmitting module and receiving module adopt the modularized design, every transmitting module and receiving module can all work alone, thereby can adjust the output of every receiving module alone, satisfy the output total power of wireless charging system, in addition, the transmitting module and the receiving module of modularized design, can do the increase-volume or reduce-volume design to the module according to actual conditions, the design degree of difficulty has been reduced.

In some optional embodiments, as shown in fig. 11, the output power calculating unit of the control device of the wireless charging system provided by the present application includes:

a rated power obtaining subunit 2210, configured to obtain a rated output power of the receiving module;

and an output power calculation subunit 2230, configured to calculate and confirm the number information of the receiving modules participating in the wireless power transmission and the output power of each receiving module according to the total output power and the rated output power.

In some optional embodiments, as shown in fig. 12, the control device of the wireless charging system provided by the present application further includes:

a current obtaining unit 2510, configured to obtain a charging current signal required by a target battery, where charging power of the target battery is total output power;

a gear determining unit 2520 for acquiring a charging power gear corresponding to the charging current signal when the charging current signal matches a preset current threshold;

and the work control unit 2530 is used for controlling the M transmitting modules to stop working according to the charging power gears, wherein M is more than or equal to 1 and less than or equal to N.

In some optional embodiments, as shown in fig. 13, the control device of the wireless charging system provided by the present application further includes:

a parameter obtaining unit 2610, configured to obtain working parameters of the wireless transmission module, where the working parameters include voltage information, current information, and transmission efficiency of the corresponding transmitting module and receiving module;

the abnormality judgment unit 2620 is used for judging whether the wireless transmission module works abnormally according to the voltage information, the current information and the transmission efficiency;

and the exception handling unit 2630 is configured to, if the determination result is yes, turn off the abnormal wireless transmission module and generate module exception alarm information.

In some optional embodiments, as shown in fig. 14, the control device of the wireless charging system provided by the present application further includes:

a phase obtaining unit 2710, configured to obtain a preset phase data list, where the phase data list includes phase information of the N transmitting modules;

the phase setting unit 2720 is configured to set a phase difference between driving signals of the N transmission modules according to the phase information, so that a phase difference exists between output voltage signals of two adjacent transmission modules.

In some optional embodiments, as shown in fig. 15, the control device of the wireless charging system provided by the present application further includes:

a frequency obtaining unit 2810, configured to obtain a signal frequency range of a driving signal of a preset transmitting module;

a frequency recording unit 2820, configured to control the driving signal to change continuously in a signal frequency range, and record the output power of the corresponding receiving module;

a frequency extracting unit 2830 for extracting a target signal frequency when the output power reaches a maximum as the frequency of the driving signal.

The control device provided by the embodiment of the present invention has the same implementation principle and technical effect as the foregoing method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the foregoing method embodiments for the parts of the embodiments that are not mentioned in the apparatus embodiments.

Example eight

In some optional embodiments, the present application further provides a wireless charging system, including:

In implementation, as shown in fig. 4, the transmitting end includes a transmitting module 1 and a transmitting module 2 …, the transmitting module n is correspondingly provided with a transmitting coil 1 and a transmitting coil 2 …, respectively, the receiving end includes a receiving module 1 and a receiving module 2 …, the receiving module n is correspondingly provided with a receiving coil 1 and a receiving coil 2 …, respectively, the transmitting coil 1 and the transmitting coil 2 … are in wireless docking with the receiving coil 1 and the receiving coil 2 …, respectively, the transmitting coil 1 and the transmitting coil 2 … are in communication connection with the transmitting communication assembly, the receiving coil 1 and the receiving coil 2 … are in communication connection with the receiving communication assembly, the transmitting communication assembly is in communication connection with the receiving communication assembly, the output power of each receiving module can be dynamically adjusted by dynamically adjusting the target power of each transmitting module, the receiving module realizes the designated output power, all the receiving modules are connected with the receiving assembly, the receiving assembly collects the output power of all the receiving modules and outputs the output power to an external load, in some embodiments, the external load is a load connected with a wireless charging system, such as a rechargeable battery, the system can finely control each transmitting module and each receiving module, and meanwhile, the transmitting module, the transmitting coil, the receiving coil and the receiving module are operated by independent modules, so that the whole system is conveniently expanded and removed, and the development and design difficulty is reduced.

In some embodiments, the wireless charging system of the present application can be applied to a track system of an automobile, please refer to fig. 16, where fig. 16 is a schematic structural diagram of an embodiment of the present application based on track application.

As shown in fig. 16, a receiving end in the wireless charging system is disposed on a locomotive or an automobile, the receiving end includes a receiving module, a receiving coil, a receiving assembly and a receiving communication assembly, the transmitting end is laid in the middle of a road or a track, and a plurality of transmitting ends can be laid in the road, taking 2 transmitting ends laid in the road as an example, which are respectively a module 1 and a module 2, the transmitting end includes a transmitting communication assembly, and a transmitting module and a transmitting coil corresponding to the receiving end, for example, the receiving end includes 3 receiving modules, and each transmitting end is provided with 3 transmitting modules. When the automobile stops on one module, for example, stops on the module 1, the transmitting communication assembly of the module 1 communicates with the receiving communication assembly on the automobile, and the transmitting module is started to work, so that the battery of the automobile is charged through the receiving module; and when the car was driven away, the transmission communication assembly of module 1 and the receiving communication assembly disconnection on the car, the emission module stop work of module 1, when the car went to module 2, the transmission communication assembly on the module 2 and the receiving communication assembly on the car carried out the communication, and at this moment, the battery of realizing the car was charged the function by the emission module work of module 2.

Example nine

In some optional embodiments, the present application further provides an electric vehicle, where the electric vehicle includes the wireless charging system as described above. In practice, as shown in fig. 16, the electric vehicle may further include only the receiving end in the wireless charging system. The transmitting terminal in the wireless charging system is arranged on a device structure outside the electric vehicle, such as a charging pile or a charging station.

The transmitting terminal of the wireless charging system comprises a plurality of transmitting modules, the receiving terminal comprises a plurality of receiving modules, the receiving modules and the transmitting modules are arranged in pairs one by one, and transmitting coils of the transmitting modules in pairs are in wireless butt joint with receiving coils of the receiving modules, so that the target power of the transmitting modules can be controlled according to the output power of the receiving modules, the total output power of the receiving modules can meet the total output power, the transmitting modules and the receiving modules are designed in a modularized mode, each module can work independently, the output power of each receiving module can be adjusted independently, capacity increasing or reducing design can be carried out on the modules according to actual conditions, and design difficulty is reduced.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling a wireless charging system, the method comprising:

acquiring the total output power required by the wireless charging system, wherein the wireless charging system comprises N wireless transmission modules, each wireless transmission module comprises a transmitting module and a corresponding receiving module, N is more than or equal to 1, a transmitting communication assembly is arranged at a transmitting end and is in communication connection with the N transmitting modules, a receiving communication assembly is arranged at a receiving end and is in communication connection with the N receiving modules, and the transmitting communication assembly is in communication connection with the receiving communication assembly for information transmission;

calculating the output power of the receiving module according to the output total power;

aiming at each wireless transmission module, calculating the transmitting power of a corresponding transmitting module according to a preset wireless transmission rule and the output power;

controlling the corresponding transmitting module to work and output the transmitting power so that the sum of the output powers of the N receiving modules meets the total output power;

setting phase differences of driving signals of N transmitting modules according to the phase information so that the phase differences exist between output voltage signals of two adjacent transmitting modules;

acquiring a preset signal frequency range of a driving signal of the transmitting module;

controlling the driving signal to continuously change in the signal frequency range, and recording the output power of the corresponding receiving module;

extracting a target signal frequency when the output power reaches the maximum as the frequency of the driving signal;

the wireless transmission rule is that the receiving communication assembly continuously acquires the required output total power from the BMS and distributes the output total power to each receiving module, then the output power information required by each receiving module is transmitted to the transmitting communication assembly, and after the transmitting communication assembly acquires the information transmitted by the receiving communication assembly, the transmitting communication assembly controls the working output power of the corresponding transmitting module to realize the output of the designated power of the corresponding receiving module.

2. The method of controlling a wireless charging system according to claim 1, wherein the step of calculating the output power of the receiving module based on the total output power includes:

obtaining rated output power of the receiving module;

and calculating and confirming the quantity information of the receiving modules participating in wireless power transmission and the output power of each receiving module according to the total output power and the rated output power.

3. The method for controlling a wireless charging system according to claim 1, wherein after the step of controlling the corresponding transmitting module to output the transmitting power such that the sum of the output powers of the N receiving modules satisfies the total output power, the method further comprises the steps of:

and controlling M transmitting modules to stop working according to the charging power gears, wherein M is more than or equal to 1 and less than or equal to N.

4. The method for controlling a wireless charging system according to claim 1, wherein after the step of controlling the corresponding transmitting module to output the transmitting power such that the sum of the output powers of the N receiving modules satisfies the total output power, the method further comprises the steps of:

acquiring working parameters of the wireless transmission module, wherein the working parameters comprise voltage information, current information and transmission efficiency of the corresponding transmitting module and receiving module;

5. A control apparatus of a wireless charging system, the apparatus comprising:

the wireless charging system comprises N wireless transmission modules, each wireless transmission module comprises a transmitting module and a corresponding receiving module, N is more than or equal to 1, a transmitting communication assembly is arranged at a transmitting end and is in communication connection with the N transmitting modules, a receiving communication assembly is arranged at a receiving end and is in communication connection with the N receiving modules, and the transmitting communication assembly is in communication connection with the receiving communication assemblies and is in communication connection with the receiving communication assemblies for information transmission;

the output power calculating unit is used for calculating the output power of the receiving module according to the output total power;

the transmitting power calculating unit is used for calculating the transmitting power of the corresponding transmitting module according to a preset wireless transmission rule and the output power aiming at each wireless transmission module;

the transmitting control unit is used for controlling the corresponding transmitting module to work and output the transmitting power so that the sum of the output powers of the N receiving modules meets the total output power;

a frequency extraction unit for extracting a target signal frequency at which the output power reaches a maximum as a frequency of the drive signal;

6. The control device of the wireless charging system according to claim 5, wherein the output power calculation unit includes:

7. A wireless charging system, comprising:

the transmitting terminal comprises a transmitting communication assembly and N transmitting modules, the transmitting communication assembly is in communication connection with the N transmitting modules, and the transmitting modules are provided with transmitting coils;

the receiving end comprises a receiving assembly, a receiving communication assembly and N receiving modules, the receiving communication assembly is in communication connection with the N receiving modules, the receiving modules are provided with receiving coils corresponding to the transmitting coils, and the receiving assembly is connected with the N receiving modules and used for collecting output power of the N receiving modules and outputting the output power to an external load;

the wireless charging system controls the transmitting power of the transmitting module by adopting the control method of any one of claims 1 to 4, so that the sum of the output powers of the N receiving modules meets the total output power of the wireless charging system.

8. An electric vehicle characterized in that it comprises the wireless charging system according to claim 7.