Wireless charging system and method, vehicle and readable storage medium

Abstract

The invention relates to a wireless charging system and method, a vehicle and a readable storage medium, and relates to the technical field of wireless charging. The wireless charging system includes an energy conversion circuit. The energy conversion circuit is connected with the high-voltage side device and the low-voltage side device and used for receiving external energy, distributing the external energy to the high-voltage side device and / or the low-voltage side device and achieving energy transmission between the high-voltage side device and the low-voltage side device. Thus, in a scene with external energy input, the external energy received by the energy conversion circuit can be directly distributed to the high-voltage side equipment / or the low-voltage side equipment according to requirements, and when no external energy input exists and the low-voltage side equipment needs electricity, the energy conversion circuit can convert the energy stored by the high-voltage side equipment to the low-voltage side equipment. And therefore, the low-voltage side equipment can use. Multiple times of electromagnetic energy conversion are not needed, so that the energy utilization rate is improved, and the loss is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of wireless charging, and in particular, to a wireless charging system, method, vehicle, and readable storage medium. Background Art

[0002] Vehicle wireless charging technology is a power transmission method that does not require a charging cable connection. Through technologies such as electromagnetic induction, electromagnetic resonance, and radio frequency, it realizes non-contact energy exchange between electric vehicles and charging devices. The electrical equipment of a vehicle mainly includes a power battery in the high-voltage side equipment and a control system, lighting system, etc. in the low-voltage side equipment. Generally, the charging voltage required by the high-voltage side equipment is relatively high (for example, above several hundred volts), while the voltage required by the low-voltage side equipment is relatively low (for example, below several tens of volts), and the two belong to different voltage levels.

[0003] Currently, in order to meet the requirements of the high-voltage side equipment and the low-voltage side equipment in vehicle wireless charging, usually, the wireless charging receiving module first receives electrical energy from the wireless charging transmitting module outside the vehicle, and then through the signal processing module, the electrical energy is processed such as compensated, rectified, filtered, regulated in voltage, and regulated in power, and then the processed electrical energy is input to the high-voltage side equipment for the high-voltage side equipment to use. And the low-voltage side equipment needs to convert the electrical energy processed by the signal processing module again through the high-low voltage conversion module for the low-voltage side equipment to use.

[0004] However, there will be certain losses in the process of processing and converting electrical energy, and multiple energy conversions will lead to the problem of excessive energy loss in wireless charging. Summary of the Invention

[0005] Embodiments of the present application provide a wireless charging system, method, vehicle, and readable storage medium, which reduce energy loss in the process of wireless charging to at least partially solve the above technical problems.

[0006] To achieve the above object, according to the first aspect of the present application, a wireless charging system is provided, including:

[0007] An energy conversion circuit, connected to the high-voltage side equipment and the low-voltage side equipment, for receiving external energy, distributing the external energy to the high-voltage side equipment and / or the low-voltage side equipment, and for energy transmission between the high-voltage side equipment and the low-voltage side equipment.

[0008] Optionally, the energy conversion circuit includes an autotransformer coil;

[0009] The autotransformer coil includes a first connection end, a second connection end, and a third connection end. The high-voltage side equipment is connected between the first connection end and the third connection end, and the low-voltage side equipment is connected between the second connection end and the third connection end.

[0010] Optionally, the number of turns of the coil between the first connection end and the third connection end is greater than the number of turns of the coil between the second connection end and the third connection end.

[0011] Optionally, it further includes a high-voltage side conversion circuit connected between the energy conversion circuit and the high-voltage side device, for performing AC-DC conversion between the energy conversion circuit and the high-voltage side device.

[0012] Optionally, the high-voltage side conversion circuit includes a bidirectional DC converter and a bidirectional AC-DC converter;

[0013] The first end of the bidirectional AC-DC converter is connected to the first connection end and the third connection end of the autotransformer coil, and the second end is connected to the first end of the bidirectional DC converter; the second end of the bidirectional DC converter is connected to the high-voltage side device.

[0014] Optionally, the high-voltage side device includes a power battery connected to the second end of the bidirectional DC converter.

[0015] Optionally, it further includes a low-voltage side conversion circuit connected between the conversion circuit and the low-voltage side device, for performing AC-DC conversion between the energy conversion circuit and the low-voltage side device.

[0016] Optionally, the low-voltage side conversion circuit includes a unidirectional AC-DC converter;

[0017] The input end of the unidirectional AC-DC converter is connected to the second connection end and the third connection end of the autotransformer coil.

[0018] Optionally, the low-voltage side device includes a starting battery and a low-voltage load;

[0019] The starting battery is connected to the output end of the unidirectional AC-DC converter and the low-voltage load, for charging according to the output voltage of the unidirectional AC-DC converter and supplying power to the low-voltage load.

[0020] According to a second aspect of the present application, there is provided a wireless charging method, which is applied to a vehicle including the above-mentioned wireless charging system, and the method includes:

[0021] Obtain the operating state of the vehicle;

[0022] According to the operating state, control the output current of the low-voltage side conversion circuit, so that the low-voltage side device charges according to the output current.

[0023] Optionally, the operating state includes a charging state and a power-on startup state; the controlling the output current of the low-voltage side conversion circuit includes:

[0024] When the voltage of the starting battery in the low-voltage side device is less than the preset voltage value, obtain the charging request current data of the starting battery, and obtain the working current data of the low-voltage load in the low-voltage side device;

[0025] According to the charging request current data and the working current data, obtain the first target data, and output the first target data to the low-voltage side conversion circuit to control the output current of the low-voltage side conversion circuit to be the first current value.

[0026] Optionally, the first current value is not greater than the sum of the charging request current data and the working current data.

[0027] Optionally, the operating state includes a power-down state; controlling the output current of the low-voltage side conversion circuit includes:

[0028] When the voltage of the starting battery in the low-voltage side device is less than the preset voltage value, obtain the charging request current data of the starting battery;

[0029] According to the charging request current data, obtain the second target data, and output the second target data to the low-voltage side conversion circuit to control the output current of the low-voltage side conversion circuit to be the second current value.

[0030] Optionally, the second current value is not greater than the charging request current data.

[0031] According to the third aspect of the present application, a vehicle is provided, including the wireless charging system as described above.

[0032] According to the fourth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method as described above are implemented.

[0033] In the wireless charging system of the embodiments of the present application, the energy conversion circuit is used not only to receive external energy but also to realize the energy transfer between the high-voltage side device and the low-voltage side device. Thus, in the scenario where there is external energy input, the external energy received by the energy conversion circuit can be directly distributed to the high-voltage side device / or the low-voltage side device according to the demand, and in the scenario where there is no external energy input and the low-voltage side device needs to use electricity, the energy conversion circuit can convert the energy stored in the high-voltage side device to the low-voltage side device for the low-voltage side device to use. It realizes that there is no need for multiple electromagnetic energy conversions, thereby improving the energy utilization rate and reducing the loss.

[0034] Other features and advantages of the present application will be described in detail in the subsequent specific implementation part. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] To more fully understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0037] Figure 1 is a schematic diagram of a vehicle wireless charging system in the related art;

[0038] Figure 2 is a block diagram of a wireless charging system provided in an exemplary embodiment of the present disclosure;

[0039] Figure 3 is a connection schematic diagram of a wireless charging system provided in an exemplary embodiment of the present disclosure;

[0040] Figure 4 is a schematic diagram of the circuit structure of a wireless charging system provided in an exemplary embodiment of the present disclosure;

[0041] Figure 5 is a flowchart of a wireless charging method provided in an exemplary embodiment of the present disclosure;

[0042] Figure 6 is a flowchart of a first method for starting battery charging provided in an exemplary embodiment of the present disclosure;

[0043] Figure 7 is a flowchart of a second method for starting battery charging provided in an exemplary embodiment of the present disclosure.

[0044] Description of reference numerals: 1, energy conversion circuit; 2, high-voltage side conversion circuit; 21, bidirectional DC converter; 22, bidirectional AC-DC converter; 3, low-voltage side conversion circuit; 31, unidirectional AC-DC converter. Detailed implementation manners

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0046] First, based on the content in the foregoing background art of the present application, the background for the proposal of the present application will be further elaborated. Refer toFigure 1 , Figure 1 is a schematic diagram of a vehicle wireless charging system in the related art. The wireless charging system in the related art includes a wireless charging receiving module, a signal processing module, and a high-low voltage conversion module that cooperate with the wireless charging transmitting module. Among them, the wireless charging transmitting module can be installed on the ground or in a parking space. The wireless charging transmitting module can include a transmitting coil and a power supply circuit. By controlling the current change in the transmitting coil, a changing magnetic field is generated for energy transmission, so as to realize the wireless transmission of electric energy to the wireless charging receiving module. The wireless charging receiving module is located on the vehicle and is used to receive electric energy from the wireless charging transmitting module. It can include a receiving coil that senses the magnetic field generated by the transmitting coil and converts the magnetic field energy into electric energy. The signal processing module is located between the wireless charging receiving module and the high-voltage side device and is used to further compensate, rectify, filter, regulate the voltage, and adjust the power of the received electric energy to ensure that the received electric energy can meet the requirements of the high-voltage side device. Finally, the high-low voltage conversion module is used to convert the electric energy processed by the signal processing module into a voltage suitable for use by the low-voltage side device for low-voltage loads such as lighting and communication. With the above wireless charging system, the wireless charging receiving module is not directly connected to the low-voltage side device, and the charging of the low-voltage side device requires secondary processing and conversion of the electric energy output by the high-voltage side device or the signal processing module, resulting in reduced electric energy utilization rate and large losses.

[0047] For another example, in some related technologies, a wireless charging system for an electric vehicle includes a transmitting coil, a high-voltage receiving coil, and a low-voltage receiving coil. Both the high-voltage receiving coil and the low-voltage receiving coil receive energy from the transmitting coil, so that the high-voltage receiving coil and the low-voltage receiving coil respectively provide energy to the high-voltage side device and the low-voltage side device. Since the low-voltage receiving coil is separately provided, the energy of the low-voltage side device does not need to be processed and converted twice. However, the high-voltage receiving coil and the low-voltage receiving coil are two independent coils, and both the high-voltage receiving coil and the low-voltage receiving coil are secondary coils, which increases the cost and occupied area on the one hand. On the other hand, energy cannot be transmitted between the high-voltage receiving coil and the low-voltage receiving coil, so energy transmission between the high-voltage side device and the low-voltage side device cannot be realized. For example, the power battery in the high-voltage side device cannot supply power to the low-voltage load in the low-voltage side device.

[0048] Based on the above problems, embodiments of the present application are proposed.

[0049] According to the first aspect of the present application, with reference to Figure 2 , the present disclosure provides a wireless charging system, including

[0050] An energy conversion circuit 1, connected to a high-voltage side device and a low-voltage side device, is used to receive external energy, distribute the external energy to the high-voltage side device and / or the low-voltage side device, and to achieve energy transfer between the high-voltage side device and the low-voltage side device.

[0051] As an example, the external energy can be output by a wireless charging transmitting module disposed outside the vehicle. The external energy is transmitted to the energy conversion circuit in the form of a changing magnetic field to achieve wireless charging. Among them, the high-voltage side device can refer to a device whose required charging voltage is higher than a first preset voltage value, and the low-voltage side device can refer to a device whose required charging voltage is lower than a second preset voltage value. The first preset voltage threshold and the second preset voltage threshold can be determined according to actual situations. For example, the first preset voltage threshold can be, but is not limited to, 360 volts, 480 volts, etc.; the second voltage threshold can be 36 volts, 72 volts, etc. The first preset voltage value is greater than the second preset voltage value.

[0052] In the above embodiment, the energy conversion circuit 1 is used both to receive external energy and to transfer energy between the high-voltage side device and the low-voltage side device. Thus, in a scenario with external energy input, the external energy received by the energy conversion circuit 1 can be directly distributed to the high-voltage side device / or the low-voltage side device according to requirements. When there is no external energy input and the low-voltage side device needs electricity, the energy conversion circuit 1 can convert the energy stored in the high-voltage side device to the low-voltage side device for the low-voltage side device to use. It realizes that there is no need to perform multiple electromagnetic energy conversions, thereby improving the energy utilization rate and reducing losses.

[0053] Refer to Figure 3 , in some embodiments, the energy conversion circuit 1 includes an autotransformer coil. The autotransformer coil includes a first connection end A, a second connection end B, and a third connection end C. The high-voltage side device is connected between the first connection end A and the third connection end C, and the low-voltage side device is connected between the second connection end B and the third connection end C.

[0054] As an example, the second connection end B can be located between the first connection end A and the third connection end C, such that the coil between the second connection end B and the third connection tube in the autotransformer coil is the shared coil part for the high-voltage side device and the low-voltage side device, and the coil between the first connection end A and the second connection end B is the non-shared coil part only used by the high-voltage side coil. The voltage of the high-voltage side device comes from the sum of the voltages on the shared coil part and the non-shared coil part, while the voltage of the low-voltage side device only comes from the shared coil part, thereby realizing that the autotransformer coil distributes external energy to the high-voltage side device and the low-voltage side device.

[0055] As an example, since the autotransformer coil is a complete coil, there is an electrical connection relationship between the first connection terminal A, the second connection terminal B, and the third connection terminal C through the coil. When the high-voltage side device outputs the energy stored in it to the autotransformer coil, the low-voltage side device can receive the energy from the high-voltage side device through the shared coil part shared with the high-voltage side device, thereby realizing the energy transfer between the high-voltage side device and the low-voltage side device.

[0056] In some embodiments, the number of turns of the coil between the first connection terminal A and the third connection terminal C is greater than the number of turns of the coil between the second connection terminal B and the third connection terminal C.

[0057] As an example, according to Faraday's law of electromagnetic induction, the magnitude of the induced electromotive force is proportional to the rate of change of the magnetic flux, and the rate of change of the magnetic flux is proportional to the number of turns of the coil. Therefore, the part with more turns generates a larger induced electromotive force, that is, it can generate a higher voltage for the high-voltage side device to use; while the part with fewer turns generates a smaller induced electromotive force, that is, the generated voltage is lower for the low-voltage side device to use.

[0058] As an example, the number of turns of the coil between the first connection terminal A and the third connection terminal C and the number of turns of the coil between the second connection terminal B and the third connection terminal C can be set respectively according to the required rated voltages of the high-voltage side device and the low-voltage side device. For example, when the required rated voltage of the high-voltage side device is 220 volts and the required rated voltage of the low-voltage side device is about 20 volts, the ratio of the number of turns of the coil between the first connection terminal A and the third connection terminal C to the number of turns of the coil between the second connection terminal B and the third connection terminal C can be set near 11:1. For example, the ratio of the number of turns of the coil between the first connection terminal A and the third connection terminal C to the number of turns of the coil between the second connection terminal B and the third connection terminal C can be 10:1, 11:1, or 12:1, etc. When the second connection terminal B is located between the first connection terminal A and the third connection terminal C, the ratio of the number of turns of the coil between the first connection terminal A and the second connection terminal B to the number of turns of the coil between the second connection terminal B and the third connection terminal C can be 9:1, 10:1, or 11:1, etc.

[0059] In the above embodiments, by setting the wiring position of the second connection terminal B on the autotransformer coil, the number of turns of the coil between the first connection terminal A and the third connection terminal C and the number of turns of the coil between the second connection terminal B and the third connection terminal C can be adjusted, so that the autotransformer coil can distribute voltages to the high-voltage side device and the low-voltage side device according to actual needs.

[0060] Refer to Figure 3 , in some embodiments, the wireless charging system further includes a high-voltage side conversion circuit 2 connected between the energy conversion circuit 1 and the high-voltage side device, for performing AC-DC conversion between the energy conversion circuit 1 and the high-voltage side device.

[0061] Reference Figure 4 Referring to Figure 4 , in some embodiments, the high-voltage side conversion circuit 2 includes a bidirectional DC converter 21 and a bidirectional AC-DC converter 22. Among them, the first end of the bidirectional AC-DC converter 22 is connected to the first connection end A and the third connection end C of the autotransformer coil; the second end of the bidirectional AC-DC converter 22 is connected to the first end of the bidirectional DC converter 21; the second end of the bidirectional DC converter 21 is connected to the high-voltage side device.

[0062] As an example, when there is external energy, the high-voltage side conversion circuit 2 operates in the receiving mode, that is, the external energy is transmitted to the autotransformer coil in the form of electromagnetic induction. The bidirectional AC-DC converter 22 receives the alternating current generated by the coil between the first connection end A and the third connection end C of the autotransformer coil, converts the alternating current into direct current, and then the bidirectional DC converter 21 adjusts the direct current output by the bidirectional AC-DC converter 22 to the rated voltage required by the high-voltage side device for charging and energy storage of the high-voltage side device.

[0063] When there is no external energy and the low-voltage side device needs to use electricity, the high-voltage side conversion circuit 2 operates in the sending mode, that is, the high-voltage side device outputs the energy stored in it in the form of direct current to the bidirectional DC converter 21. The bidirectional DC converter 21 adjusts the amplitude of the direct current output by the high-voltage side device and outputs the adjusted direct current to the bidirectional AC-DC converter 22. The bidirectional AC-DC converter 22 converts the adjusted direct current into alternating current and transmits it to the autotransformer coil, and provides energy to the low-voltage side device through the autotransformer coil.

[0064] In the above embodiments, through the bidirectional DC converter 21 and the bidirectional AC-DC converter 22, the autotransformer coil can transmit energy to the high-voltage side device, and the high-voltage side device can also transmit energy to the autotransformer coil, realizing the bidirectional energy transmission between the autotransformer coil and the high-voltage side device, and integrating the charging and discharging functions of the high-voltage side device.

[0065] Reference Figure 3 Referring to Figure 3 , in some embodiments, the wireless charging system further includes a low-voltage side conversion circuit 3 connected between the conversion circuit and the low-voltage side device, for performing AC-DC conversion between the energy conversion circuit 1 and the low-voltage side device.

[0066] Reference Figure 4 Referring to Figure 4 , in some embodiments, the low-voltage side conversion circuit 3 includes a unidirectional AC-DC converter 31. Among them, the input end of the unidirectional AC-DC converter 31 is connected to the second connection end B and the third connection end C of the autotransformer coil.

[0067] As an example, since the low-voltage side devices usually cannot supply energy to the high-voltage side devices, the unidirectional AC-DC converter 31 only needs to operate in the receiving mode. That is, the unidirectional AC-DC converter 31 receives the alternating current generated by the coil between the second connection terminal B and the third connection terminal C on the autotransformer coil, and converts the alternating current into direct current for use by the low-voltage side load.

[0068] As an example, by controlling the unidirectional AC-DC converter 31, the on-off of the autotransformer coil and the low-voltage side devices can be controlled. When the low-voltage side devices do not need to work or are not in need of power supply, the unidirectional AC-DC converter 31 is disconnected to stop the autotransformer coil from supplying energy to the low-voltage side devices, thereby reducing energy consumption.

[0069] Refer to Figure 3 , in some embodiments, the high-voltage side device includes a power battery VB1 connected to the second terminal of the bidirectional DC converter 21.

[0070] Refer to Figure 3 , in some embodiments, the low-voltage side device includes a starting battery VB2 and a low-voltage load RL. Among them, the starting battery VB2 is connected to the output terminal of the unidirectional AC-DC converter 31 and the low-voltage load RL, and is used to charge according to the output voltage of the unidirectional AC-DC converter 31 and supply power to the low-voltage load RL.

[0071] As an example, the low-voltage load RL operates using the energy stored in the starting battery VB2 and does not need to obtain energy from the autotransformer coil in real time. The charge and discharge of the starting battery VB2 can be controlled by the battery management system of the starting battery VB2. When the voltage of the starting battery VB2 is too low, the high-voltage side conversion circuit 2 is controlled to operate in the transmitting mode, and the energy stored in the high-voltage side device is transmitted to the autotransformer coil to charge the starting battery VB2.

[0072] Refer to Figure 5 , according to the second aspect of the present application, a wireless charging method is provided, including step S101-step S102, which will be introduced in detail below.

[0073] Step S101: Obtain the operating state of the vehicle.

[0074] Among them, the operating state includes the charging state, the power-on startup state, and the power-off state. The charging state of the vehicle refers to the state when the vehicle is charging the power battery. The vehicle can be an electric vehicle or a hybrid vehicle. The power-on startup state of the vehicle refers to the process in which the vehicle changes from the power-off state to the power-on state and is ready to start the engine or the motor. The power-off state of the vehicle refers to the process in which the vehicle changes from the power-on state to the power-off state, shuts down most of the vehicle's electronic systems and electrical devices, and stops the operation and functions of the vehicle.

[0075] Step S102: Control the output current of the low-voltage side conversion circuit according to the operating state, so that the low-voltage side device charges according to the output current.

[0076] As an example, the wireless charging method may further include controlling the operating mode of the high-voltage side conversion circuit according to the operating state. For example, when the operating state of the vehicle is the charging state, the high-voltage side conversion circuit operates in the receiving mode. When the operating state of the vehicle is the power-on startup state and / or the power-off state, and the low-voltage side device needs to use electricity, the high-voltage side conversion circuit operates in the transmitting mode. When the operating state of the vehicle is the power-off state and the low-voltage side device does not need to use electricity, the high-voltage side conversion circuit does not operate.

[0077] In the above embodiments, in different operating states of the vehicle, the output current of the low-voltage side conversion circuit can be controlled differently, so that the low-voltage side device can reasonably utilize the electric energy on the autotransformer coil.

[0078] Refer to Figure 6 , in some embodiments, when the operating state of the vehicle is the charging state and the power-on startup state, step S102 may include step S201-step S202, which will be introduced in detail below.

[0079] Step S201: When the voltage of the starting battery in the low-voltage side device is less than the preset voltage value, obtain the charging request current data of the starting battery, and obtain the working current data of the low-voltage load in the low-voltage side device.

[0080] Step S202: Obtain the first target data according to the charging request current data and the working current data, and output the first target data to the low-voltage side conversion circuit to control the output current of the low-voltage side conversion circuit to be the first current value.

[0081] As an example, the first current value is not greater than the sum of the charging request current data and the working current data.

[0082] As an example, when the operating state of the vehicle is the charging state and the power-on startup state, the low-voltage load in the vehicle needs to be in the working state, such as the control system, etc. At this time, the current consumption of the starting battery should be the sum of the charging request current data and the working current data. Maintaining the output current of the low-voltage side conversion circuit at the first current value not greater than the sum of the charging request current data and the working current data can avoid the starting battery from running out of power and shorten the service life of the starting battery caused by charging the starting battery with a large current for a long time.

[0083] Refer to Figure 7 , in some embodiments, when the operating state of the vehicle is the power-off state, step S102 may include step S301-step S302, which will be introduced in detail below.

[0084] Step S301: When the voltage of the starting battery in the low-voltage side equipment is less than the preset voltage value, obtain the charging request current data of the starting battery.

[0085] Step S302: Obtain the second target data according to the charging request current data, and output the second target data to the low-voltage side conversion circuit to control the output current of the low-voltage side conversion circuit to be the second current value.

[0086] As an example, the second current value is not greater than the charging request current data.

[0087] As an example, when the operating state of the vehicle is the power-off state, the low-voltage loads in the vehicle usually do not need to work. At this time, the current consumption of the starting battery should be equal to the charging request current data. Maintaining the output current of the low-voltage side conversion circuit at the second current value that is not greater than the charging request current data can avoid the starting battery from running out of power and, at the same time, avoid the shortening of the starting battery life caused by charging the starting battery with a large current for a long time.

[0088] The independent claim of this wireless charging method has all the beneficial effects of the above wireless charging system, which will not be elaborated herein.

[0089] According to the third aspect of the present application, a vehicle is provided, including the above wireless charging system.

[0090] Among them, the vehicle can be a plug-in hybrid vehicle or a new energy vehicle, etc., and the present disclosure does not make specific limitations thereto.

[0091] According to the fourth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above method are implemented.

[0092] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, read-only compact disc read-only memory (CD-ROM), optical memory, etc.) containing computer-usable program code.

[0093] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate a machine for implementing the functions specified in the process Figure 1 one process or multiple processes and / or blocks Figure 1 a device for the functions specified in one block or multiple blocks.

[0094] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in the process Figure 1 one process or multiple processes and / or blocks Figure 1 a step for the functions specified in one block or multiple blocks.

[0095] Computer-readable media includes both permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated communication signals and carrier waves.

[0096] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0097] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0098] The embodiments, implementation manners and related technical features of the present application can be combined and replaced with each other without conflict.

[0099] The above are only the preferred embodiments of the present application and do not impose any formal limitations on the present application. Although in the embodiments of the present application, the descriptions of the respective embodiments have their own emphases, and for the parts not detailed in a certain embodiment, reference may be made to the relevant embodiments of other embodiments, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A wireless charging system, characterized in that: include: An energy conversion circuit is connected to the high-voltage side device and the low-voltage side device, and is used to receive external energy and distribute the external energy to the high-voltage side device and / or the low-voltage side device, and to realize energy transmission between the high-voltage side device and the low-voltage side device.

2. The wireless charging system according to claim 1, characterized in that: The energy conversion circuit includes an autocoil; The autocoil includes a first connection end, a second connection end and a third connection end, the high-voltage side device is connected between the first connection end and the third connection end, and the low-voltage side device is connected between the second connection end and the third connection end.

3. The wireless charging system according to claim 2, characterized in that: The number of turns of the coil between the first connection end and the third connection end is greater than the number of turns of the coil between the second connection end and the third connection end.

4. The wireless charging system according to claim 2, characterized in that: It also includes a high-voltage side conversion circuit connected between the energy conversion circuit and the high-voltage side device, which is used to perform AC / DC conversion between the energy conversion circuit and the high-voltage side device.

5. The wireless charging system according to claim 4, characterized in that: The high-voltage side conversion circuit includes a bidirectional DC converter and a bidirectional AC-DC converter; The first end of the bidirectional AC / DC converter is connected to the first connection end and the third connection end, the second end of the bidirectional AC / DC converter is connected to the first end of the bidirectional DC converter; the second end of the bidirectional DC converter is connected to the high-voltage side device.

6. The wireless charging system according to claim 5, characterized in that: The high-voltage side device includes a power battery connected to the second end of the bidirectional DC converter.

7. The wireless charging system according to claim 2, characterized in that: It also includes a low-voltage side conversion circuit connected between the conversion circuit and the low-voltage side device, which is used to perform AC-DC conversion between the energy conversion circuit and the low-voltage side device.

8. The wireless charging system according to claim 7, characterized in that: The low-voltage side conversion circuit includes a unidirectional AC-DC converter; The input end of the unidirectional AC / DC converter is connected to the second connection end and the third connection end.

9. The wireless charging system according to claim 8, characterized in that: The low-voltage side equipment includes a starting battery and a low-voltage load; The starting battery is connected to the output end of the unidirectional AC / DC converter and the low-voltage load, and is used for charging according to the output voltage of the unidirectional AC / DC converter and supplying power to the low-voltage load.

10. A wireless charging method, characterized in that: Applied to a vehicle including the wireless charging system according to any one of claims 1 to 9, the method comprises: Obtaining the operating status of the vehicle; According to the operating state, the output current of the low-voltage side conversion circuit is controlled so that the low-voltage side device is charged according to the output current.

11. The wireless charging method according to claim 10, characterized in that: The operating state includes a charging state and a power-on startup state; the output current of the low-voltage side conversion circuit is controlled, including: When the voltage of the starting battery in the low-voltage side device is less than a preset voltage value, obtaining charging request current data of the starting battery, and obtaining working current data of the low-voltage load in the low-voltage side device; A first target data is obtained according to the charging request current data and the operating current data, and the first target data is output to the low-voltage side conversion circuit to control the output current of the low-voltage side conversion circuit to be a first current value.

12. The wireless charging method according to claim 11, characterized in that: The first current value is not greater than the sum of the charging request current data and the operating current data.

13. The wireless charging method according to claim 10, characterized in that: The operating state includes a power-off state; The controlling the output current of the low-voltage side conversion circuit comprises: When the voltage of the starting battery in the low-voltage side device is less than a preset voltage value, obtaining charging request current data of the starting battery; According to the charging request current data, second target data is obtained, and the second target data is output to the low-voltage side conversion circuit to control the output current of the low-voltage side conversion circuit to be a second current value.

14. The wireless charging method according to claim 13, characterized in that: The second current value is not greater than the charging request current data.

15. A vehicle, characterized in that: Comprising the wireless charging system as described in any one of claims 1 to 9.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 10 to 14 are implemented.

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