Integrated structure of wireless charging of electric vehicle, on-board charging and auxiliary power supply system

Abstract

The application provides an integrated structure of wireless charging, vehicle-mounted charging and auxiliary power supply system of an electric vehicle, wherein the battery system of the electric vehicle comprises a high-voltage battery for providing power for the operation of the electric vehicle, and a low-voltage battery for providing power for a power steering system, an air conditioner and other auxiliary equipment; the high-voltage battery is charged by a vehicle-mounted charging system receiving external power in a wired mode or a wireless charging system receiving external power in a wireless mode; the low-voltage battery is charged by an auxiliary power supply charging system; in the integrated structure, a vehicle-mounted transmitting coil connected with the wired vehicle-mounted charging system is arranged in the electric vehicle; the vehicle-mounted transmitting coil can supply power to the wireless charging system in the vehicle; the application can reduce the cost and volume of the vehicle-side charging system; meanwhile, the application can also be used as a good energy storage to participate in the dispatching of the power grid when the electric vehicle is not used, thereby reducing the waste of power grid energy and bringing economic benefits to the users of the electric vehicle.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle technology, and in particular to the integrated structure of wireless charging, on-board charging and auxiliary power systems for electric vehicles. Background Technology

[0002] Compared to traditional gasoline-powered vehicles, electric vehicles not only reduce environmental pollution but also have relatively lower travel costs. Furthermore, the direct power output and greater torque of pure electric vehicles result in acceleration performance that gasoline-powered vehicles cannot match. In addition, electric vehicles facilitate the design of intelligent services, providing users with a more comfortable riding experience. Based on these advantages and the country's "dual-carbon" policy, electric vehicles are gradually becoming a popular choice in the automotive market.

[0003] At the same time, the rapid development of electric vehicles has placed higher demands on various technologies related to electric vehicles. One of the most critical components is the battery, which serves as the power source for electric vehicles. A suitable charging system can improve the safety and efficiency of electric vehicle battery charging, as well as extend battery life and driving range. The power batteries in electric vehicles are high-voltage batteries.

[0004] Currently, there are two main charging methods for high-voltage power batteries in electric vehicles: wired charging and wireless charging. Traditional wired charging systems for electric vehicles are relatively mature, with well-tested products and high energy conversion efficiency. They offer fast charging speeds and relatively stable charging, making them the primary charging method currently. A typical on-board charger (OBC) system is shown in the attached image. Figure 1 As shown, the power grid's AC frequency is rectified and isolated by a DC-DC converter, ultimately charging the high-voltage battery.

[0005] Wireless charging, on the other hand, eliminates the need for contact between the charger and the charging device, making it convenient, environmentally adaptable, and capable of automation and intelligent operation. Therefore, wireless charging technology is currently experiencing rapid development. A typical wireless charging system (Wireless Power Transfer, WPT) is as follows: Figure 2 As shown, the power grid's AC frequency is rectified into DC, then inverted back into AC at high frequency, and then transmitted through a compensation network via a transmission coil. The energy is received by a receiving coil on the vehicle, and then, after passing through the compensation network, it is rectified and filtered to charge the high-voltage battery.

[0006] Electric vehicles have two battery systems: a high-voltage battery pack that powers the vehicle's operation, and a low-voltage auxiliary power battery pack that powers the power steering system, air conditioning, and other auxiliary equipment. The low-voltage battery pack has a relatively smaller capacity. Currently, charging the low-voltage battery pack involves using an isolated DC-DC converter to charge the high-voltage battery. Current auxiliary power module (APM) charging systems include... Figure 3 As shown, the high-voltage battery inside the vehicle outputs DC power, which is then inverted into AC power, stepped down by a transformer, rectified back into DC power, and filtered before being used to power the low-voltage battery pack.

[0007] Therefore, electric vehicles will have three charging systems: an onboard wired and wireless charging system for charging the high-voltage battery pack, and an auxiliary power charging system for charging the low-voltage battery pack, such as... Figure 4 As shown in the diagram. In the current solution, these three systems are independent of each other. During charging, the high-voltage battery pack can only be charged by the on-board charging system or the wireless charging system, which increases the cost, size, and weight of the vehicle-side charging system.

[0008] Meanwhile, due to daily load variations and power generation fluctuations at power plants, a significant amount of electricity in the grid is wasted due to lack of use. Furthermore, the discontinuity of various renewable energy sources causes power generation fluctuations. Therefore, other energy sources are needed to compensate for grid inefficiencies. In the solution described in this invention, the large-capacity battery of an electric vehicle can act as a buffer for the grid, feeding power to the grid when the load is high and storing excess energy when the load is low, thus reducing waste. This is known as a vehicle-to-grid (V2G) system. The principle of the V2G system is as follows: Figure 5 As shown. Summary of the Invention

[0009] This invention proposes an integrated structure for wireless charging, on-board charging, and auxiliary power systems for electric vehicles, which can reduce the cost and size of vehicle-side charging systems. At the same time, when the electric vehicle is not in use, it can also serve as a good energy storage system to participate in grid dispatch, reducing grid energy waste and bringing economic benefits to electric vehicle users.

[0010] The present invention adopts the following technical solution.

[0011] An integrated structure for wireless charging, on-board charging, and auxiliary power systems of electric vehicles is disclosed. The battery system of the electric vehicle includes a high-voltage battery that powers the operation of the electric vehicle, and a low-voltage battery that powers the power steering system, air conditioner, and other auxiliary equipment. The high-voltage battery is charged by an on-board charging system that receives external power via a wired connection or a wireless charging system that receives external power wirelessly. The low-voltage battery is charged by an auxiliary power charging system. In the integrated structure, the electric vehicle is equipped with an on-board transmitting coil connected to the wired on-board charging system; the on-board transmitting coil can supply power to the in-vehicle wireless charging system.

[0012] The on-board charging system, wireless charging system, and auxiliary power charging system reduce the cost and size of the vehicle-side charging system by sharing active and passive components, and enable the electric vehicle to participate in grid dispatch as an energy storage power source when not in use; its operating mode includes: Method 1: When charging electric vehicles wirelessly, the AC power output from the grid is rectified, inverted at high frequency, and compensated to convert electrical energy into magnetic energy, which is then transmitted through the transmitting coil outside the vehicle. The high-voltage receiving coil and the low-voltage receiving coil receive the electrical energy, which is then rectified and filtered before charging the high-voltage battery and the low-voltage battery, respectively. Method 2: When charging the vehicle via wired connection, the AC power output from the grid is transmitted to the vehicle through the charging equipment. After passing through PFC, inverter compensation and transformation, it is transmitted wirelessly through the vehicle's transmitting coil. The high-voltage receiving coil and the low-voltage receiving coil receive the energy transmitted by the vehicle's transmitting coil, and after rectification and filtering, they charge the high-voltage battery and the low-voltage battery respectively.

[0013] Method 3: When an electric vehicle is charged simultaneously via wireless charging and wired charging via onboard equipment, it simultaneously charges the high-voltage battery and the low-voltage battery through the processes described in Method 1 and Method 2 respectively. Method 4: When charging the low-voltage battery of the vehicle's auxiliary power supply, the electrical energy output by the high-voltage battery is inverted and transmitted by the vehicle's on-board transmitting coil connected to the high-voltage battery. It is then received by the charging coil at the low-voltage end, rectified, filtered, and used to charge the low-voltage battery. Method 5: When the electric vehicle is not in motion, the energy storage system consisting of the high-voltage battery and the low-voltage battery on the vehicle feeds back to the grid through a reverse circuit.

[0014] When the electric vehicle is not charged by external power, the high-voltage battery charges the low-voltage battery through the on-board charging system; the rectifier circuit of the on-board charging system adopts a single-phase full-wave controllable rectifier circuit to match the low output voltage of the low-voltage battery side.

[0015] In the on-board charging system with the integrated circuit topology described above, an inverter bridge is formed by switches S1~S4. Switch SW1 is closed during charging of the on-board charging system.T1 C is the transmitting coil for the on-board charging system. T1 Compensating capacitor for on-board charging system; In the wireless charging system with the integrated circuit topology, the switching transistors S9~S9 12 Forming an inverter bridge, switch SW2 is closed when the wireless charging system is charging, L T2 C is the transmitting coil for the on-board charging system. T2 Compensating capacitors for wireless charging systems; In the high-voltage battery side of the integrated circuit topology, switching transistors S5~S8 form a rectifier bridge, L R1 C is the receiving coil for the high-voltage battery. R1 To compensate for the capacitance, C A1 For filtering capacitors; In the low-voltage battery side of the integrated circuit topology, the switching transistor S... 13 ~S 14 Forming a full-wave controllable rectifier bridge, L R21 L R22 L R23 and L R24 For the receiving coil of the low-voltage battery, C R21 and C R22 C is the compensation capacitor for the full-wave controlled rectifier bridge. A2 For filtering capacitors; The low-voltage coil at the low-voltage end of the low-voltage battery adopts a four-coil parallel winding structure, that is, the low-voltage coil is designed as four identical coils connected in parallel, and the four coils are concentrated on the same plane to reduce the current that a single coil has to bear and to make the coil structure more compact.

[0016] The circuit topology of the integrated structure has the following operating modes: on-board charging mode, wireless charging mode, high-voltage battery power supply mode to low-voltage battery, power supply to the grid mode, and hybrid charging mode, which is on-board charging and wireless charging mode that simultaneously performs on-board charging and wireless charging.

[0017] When the circuit topology operates in vehicle charging mode, the transmitting coil for wireless charging is switched off and unused. The vehicle charging transmitting coil charges both the high-voltage and low-voltage batteries simultaneously, or it can charge one of the batteries individually.

[0018] When the circuit topology is operating in wireless charging mode, the on-board charging transmitter coil is in a cut-out and unused state. The wireless charging transmitter coil can charge both the high-voltage and low-voltage batteries simultaneously, or it can charge only one of the batteries.

[0019] When the circuit topology operates in hybrid charging mode, the electric vehicle system simultaneously performs on-board charging and wireless charging. At this time, the on-board charging transmitting coil and the external wireless charging transmitting coil simultaneously charge the high-voltage battery and the low-voltage battery, or one of the batteries can be charged at the same time.

[0020] When the circuit topology operates in the mode where the high-voltage battery supplies power to the low-voltage battery, both the on-board charging transmitter coil and the external wireless charging transmitter coil are switched off. Depending on the battery usage, the high-voltage battery can charge the low-voltage battery, or the low-voltage battery can charge the high-voltage battery.

[0021] When the circuit topology operates in the power grid feeding mode, the high-voltage battery emits energy through the high-voltage side coil and the low-voltage side coil, and feeds the power grid through the on-board charging transmitting coil and the wireless charging transmitting coil.

[0022] When inductance compensation is required, the integrated structure uses DD coils, 4D coils, overlapping single-pole coils, or solenoid coils as compensation coils for on-board charging equipment or transmission coils for ground equipment outside the vehicle.

[0023] This invention proposes an integrated solution for electric vehicle charging systems. By sharing active components (such as power electronic converters) and passive components (inductors and capacitors), the cost and size of the vehicle-side charging system are reduced. Simultaneously, when the electric vehicle is not in use, it can also serve as a good energy storage system, participating in grid dispatch and reducing grid energy waste while bringing economic benefits to electric vehicle users. This achieves the requirements for low cost and lightweight design of electric vehicle charging systems.

[0024] In this invention, the high-voltage end and the low-voltage end receive the same power transmission during the charging process. Therefore, the low-voltage end coil needs to withstand low voltage and high current, which places very high demands on the current carrying capacity of the coil. Therefore, this invention proposes a four-coil parallel winding design for the low-voltage coil. This design makes the low-voltage coil into four identical coils connected in parallel, and at the same time concentrates the four coils on the same plane, which reduces the current that a single coil needs to withstand and makes the coil structure more compact.

[0025] Compared to traditional wired charging and wireless charging solutions, the advantages of this invention are: (1) It makes charging more adaptable, allowing users to freely choose between two charging methods depending on environmental conditions and charging equipment. Moreover, compared to a single system, it only incurs a relatively small increase in size and weight while greatly improving the adaptability of electric vehicle charging. Compared to traditional integrated systems, it reduces the space occupied in the vehicle and the cost.

[0026] (2) The parallel winding of the low-voltage side coils reduces the current density of each secondary coil and also reduces the resistance, thereby reducing the winding loss and lowering the temperature of the winding during charging. Furthermore, due to the winding method, the low-voltage winding is wound on a plane, which does not increase the winding volume.

[0027] (3) The vehicle can charge both the high-voltage and low-voltage batteries during wired and wireless charging. When not charging, it can also supply power from the high-voltage battery to the low-voltage battery, making it highly practical.

[0028] (4) The energy storage system on the vehicle side and the grid energy can be fully utilized through the bidirectional charging and discharging system, which not only reduces the waste of grid energy, but also brings some economic benefits to electric vehicle users. Attached Figure Description

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Appendix Figure 1 This is a schematic diagram illustrating the working principle of a typical on-board charger (OBC) system using traditional technology. Appendix Figure 2 This is a schematic diagram illustrating the working principle of a typical wireless power transfer (WPT) system using traditional technology. Appendix Figure 3 This is a schematic diagram illustrating the working principle of a current auxiliary power module (APM) charging system using traditional technology. Appendix Figure 4 This is a schematic diagram illustrating the working principle of the three charging systems for electric vehicles under traditional technology. Appendix Figure 5 This is a schematic diagram illustrating the principle of a vehicle-to-grid (V2G) power supply system. Appendix Figure 6 This is a schematic diagram of the integrated scheme of the electric vehicle wireless charging system, on-board charging system and auxiliary power system proposed in this invention. Appendix Figure 7 This is a schematic diagram of the integrated topology of an electric vehicle wireless charging system, an on-board charging system, and an auxiliary power system. Appendix Figure 8 This is a schematic diagram of the on-board charging mode. Appendix Figure 9 Schematic diagram of wireless charging mode Appendix Figure 10 This is a schematic diagram of the operation of onboard charging and wireless charging modes (hybrid mode). Appendix Figure 11 This is a schematic diagram of the high-voltage battery supplying power to the low-voltage battery in this invention; Appendix Figure 12 This is a topology diagram of an electric vehicle feeding power to the power grid in this invention; Appendix Figure 13 This is a schematic diagram of the winding of the winding coil in this invention ((a) front view, (b) 3D schematic view, and (c) 3D layered schematic diagram in the figure). Appendix Figure 14 This is a schematic diagram of the low-voltage winding coil of the present invention ((a) 3D schematic view, (b) simplified single coil schematic view, and (c) simplified top view in the figure). Detailed Implementation

[0030] As shown in the figure, the integrated structure of the electric vehicle's wireless charging, on-board charging, and auxiliary power system includes a high-voltage battery that powers the electric vehicle and a low-voltage battery that powers the power steering system, air conditioner, and other auxiliary equipment. The high-voltage battery is charged by an on-board charging system that receives external power via a wired connection or a wireless charging system that receives external power wirelessly. The low-voltage battery is charged by an auxiliary power charging system. In the integrated structure, the electric vehicle is equipped with an on-board transmitting coil connected to the wired on-board charging system. The on-board transmitting coil can supply power to the wireless charging system inside the vehicle.

[0031] The on-board charging system, wireless charging system, and auxiliary power charging system reduce the cost and size of the vehicle-side charging system by sharing active and passive components, and enable the electric vehicle to participate in grid dispatch as an energy storage power source when not in use; such as Figure 6 As shown, its working method includes: Method 1: When charging electric vehicles wirelessly, the AC power output from the grid is rectified, inverted at high frequency, and compensated to convert electrical energy into magnetic energy, which is then transmitted through the transmitting coil outside the vehicle. The high-voltage receiving coil and the low-voltage receiving coil receive the electrical energy, which is then rectified and filtered before charging the high-voltage battery and the low-voltage battery, respectively. Method 2: When charging the vehicle via wired connection, the AC power output from the grid is transmitted to the vehicle through the charging equipment. After passing through PFC, inverter compensation and transformation, it is transmitted wirelessly through the vehicle's transmitting coil. The high-voltage receiving coil and the low-voltage receiving coil receive the energy transmitted by the vehicle's transmitting coil, and after rectification and filtering, they charge the high-voltage battery and the low-voltage battery respectively.

[0032] Method 3: When an electric vehicle is charged simultaneously via wireless charging and wired charging via onboard equipment, it simultaneously charges the high-voltage battery and the low-voltage battery through the processes described in Method 1 and Method 2 respectively. Method 4: When charging the low-voltage battery of the vehicle's auxiliary power supply, the electrical energy output by the high-voltage battery is inverted and transmitted by the vehicle's on-board transmitting coil connected to the high-voltage battery. It is then received by the charging coil at the low-voltage end, rectified, filtered, and used to charge the low-voltage battery. Method 5: When the electric vehicle is not in motion, the energy storage system consisting of the high-voltage battery and the low-voltage battery on the vehicle feeds back to the grid through a reverse circuit.

[0033] When the electric vehicle is not charged by external power, the high-voltage battery charges the low-voltage battery through the on-board charging system; the rectifier circuit of the on-board charging system adopts a single-phase full-wave controllable rectifier circuit to match the low output voltage of the low-voltage battery side.

[0034] like Figure 7 As shown, in the on-board charging system with the integrated circuit topology, the inverter bridge is composed of switches S1~S4. Switch SW1 is closed during charging of the on-board charging system. T1 C is the transmitting coil for the on-board charging system. T1 Compensating capacitor for on-board charging system; like Figure 7 As shown, in the wireless charging system with the integrated circuit topology, the switching transistors S9~S 12 Forming an inverter bridge, switch SW2 is closed when the wireless charging system is charging, L T2 C is the transmitting coil for the on-board charging system. T2 Compensating capacitors for wireless charging systems; like Figure 7 As shown, in the high-voltage battery side of the integrated circuit topology, switching transistors S5~S8 form a rectifier bridge, L R1 C is the receiving coil for the high-voltage battery. R1 To compensate for the capacitance, C A1 For filtering capacitors; like Figure 7 As shown, in the low-voltage battery side of the integrated circuit topology, the switching transistor S... 13 ~S 14 Forming a full-wave controllable rectifier bridge, L R21 L R22 L R23 and L R24 For the receiving coil of the low-voltage battery, C R21 and C R22 C is the compensation capacitor for the full-wave controlled rectifier bridge. A2 For filtering capacitors; like Figure 14As shown, the low-voltage coil at the low-voltage end of the low-voltage battery adopts a four-coil parallel winding structure, that is, the low-voltage coil is designed as four identical coils connected in parallel, and the four coils are concentrated on the same plane to reduce the current that a single coil has to bear and to make the coil structure more compact.

[0035] The circuit topology of the integrated structure has the following operating modes: on-board charging mode, wireless charging mode, high-voltage battery power supply mode to low-voltage battery, power supply to the grid mode, and hybrid charging mode, which is on-board charging and wireless charging mode that simultaneously performs on-board charging and wireless charging.

[0036] like Figure 8 As shown, when the circuit topology operates in vehicle charging mode, the transmitting coil part used for wireless charging is in a cut-out and unused state. The vehicle charging transmitting coil charges both the high-voltage and low-voltage batteries simultaneously, or it can charge one of the batteries individually.

[0037] like Figure 9 As shown, when the circuit topology is operating in wireless charging mode, the on-board charging transmitter coil is in a cut-out and unused state. The wireless charging transmitter coil charges both the high-voltage and low-voltage batteries simultaneously, or it can charge one of the batteries individually.

[0038] like Figure 10 As shown, when the circuit topology operates in hybrid charging mode, the electric vehicle system simultaneously performs on-board charging and wireless charging. At this time, the on-board charging transmitting coil and the external wireless charging transmitting coil simultaneously charge the high-voltage battery and the low-voltage battery, or one of the batteries can be charged at the same time.

[0039] like Figure 11 As shown, when the circuit topology operates in the mode of supplying power from the high-voltage battery to the low-voltage battery, both the on-board charging transmitter coil and the external wireless charging transmitter coil are switched off. Depending on the battery usage, the high-voltage battery can charge the low-voltage battery, or the low-voltage battery can charge the high-voltage battery.

[0040] like Figure 12 As shown, when the circuit topology operates in the power grid feeding mode, the high-voltage battery emits energy through the high-voltage side coil and the low-voltage side coil, and feeds the power grid through the on-board charging transmitting coil and the wireless charging transmitting coil.

[0041] like Figure 13 As shown, when inductance compensation is required, the integrated structure uses DD coils, 4D coils, overlapping single-pole coils, or solenoid coils as compensation coils for on-board charging equipment or transmission coils for ground equipment outside the vehicle.

[0042] In this example, the circuit topology can also be customized according to specific production and usage requirements. In the rectifier section, a half-wave controlled rectifier circuit, a bridge fully controlled rectifier circuit, a full-wave controlled rectifier circuit, or a bridge half-controlled rectifier circuit can be used. In the inverter section, a voltage-source inverter circuit or a current-source inverter circuit can be used. In terms of compensation circuits, LCC compensation, S compensation, SP compensation, LLC compensation, LCL compensation, CLC compensation, etc. can also be used.

Claims

1. An integrated structure for wireless charging, on-board charging, and auxiliary power systems for electric vehicles, characterized in that: The electric vehicle's battery system includes a high-voltage battery that powers the vehicle's operation, and a low-voltage battery that powers the power steering system, air conditioner, and other auxiliary equipment. The high-voltage battery is charged by an on-board charging system that receives external power via a wired connection or a wireless charging system that receives external power wirelessly. The low-voltage battery is charged by an auxiliary power charging system. In the integrated structure, the electric vehicle is equipped with an on-board transmitting coil connected to the wired on-board charging system. The on-board transmitting coil can supply power to the in-vehicle wireless charging system. The on-board charging system, wireless charging system, and auxiliary power charging system reduce the cost and size of the vehicle-side charging system by sharing active and passive components, and enable the electric vehicle to participate in grid dispatch as an energy storage power source when not in use; its operating mode includes: Method 1: When charging electric vehicles wirelessly, the AC power output from the grid is rectified, inverted at high frequency, and compensated to convert electrical energy into magnetic energy, which is then transmitted through the transmitting coil outside the vehicle. The high-voltage receiving coil and the low-voltage receiving coil receive the electrical energy, which is then rectified and filtered before charging the high-voltage battery and the low-voltage battery, respectively. Method 2: When charging the vehicle via wired connection, the AC power output from the grid is transmitted to the vehicle through the charging equipment. After passing through PFC, inverter compensation and transformation, it is transmitted wirelessly through the vehicle's transmitting coil. The high-voltage receiving coil and the low-voltage receiving coil receive the energy transmitted by the vehicle's transmitting coil, and after rectification and filtering, they charge the high-voltage battery and the low-voltage battery respectively. Method 3: When an electric vehicle is charged simultaneously via wireless charging and wired charging via onboard equipment, it simultaneously charges the high-voltage battery and the low-voltage battery through the processes described in Method 1 and Method 2 respectively. Method 4: When charging the low-voltage battery of the vehicle's auxiliary power supply, the electrical energy output by the high-voltage battery is inverted and transmitted by the vehicle's on-board transmitting coil connected to the high-voltage battery. It is then received by the charging coil at the low-voltage end, rectified, filtered, and used to charge the low-voltage battery. Method 5: When the electric vehicle is not in motion, the energy storage system consisting of the high-voltage battery and the low-voltage battery on the vehicle feeds back to the grid through a reverse circuit.

2. The integrated structure of the electric vehicle wireless charging, on-board charging, and auxiliary power system according to claim 1, characterized in that: When the electric vehicle is not charged by external power, the high-voltage battery charges the low-voltage battery through the on-board charging system; the rectifier circuit of the on-board charging system adopts a single-phase full-wave controllable rectifier circuit to match the low output voltage of the low-voltage battery side.

3. The integrated structure of the electric vehicle wireless charging, on-board charging, and auxiliary power system according to claim 1, characterized in that: In the on-board charging system with the integrated circuit topology described above, an inverter bridge is formed by switches S1~S4. Switch SW1 is closed during charging of the on-board charging system. T1 C is the transmitting coil for the on-board charging system. T1 Compensating capacitor for on-board charging system; In the wireless charging system with the integrated circuit topology, the switching transistors S9~S9 12 Forming an inverter bridge, switch SW2 is closed when the wireless charging system is charging, L T2 C is the transmitting coil for the on-board charging system. T2 Compensating capacitors for wireless charging systems; In the high-voltage battery side of the integrated circuit topology, switching transistors S5~S8 form a rectifier bridge, L R1 C is the receiving coil for the high-voltage battery. R1 To compensate for the capacitance, C A1 For filtering capacitors; In the low-voltage battery side of the integrated circuit topology, the switching transistor S... 13 ~S 14 Forming a full-wave controllable rectifier bridge, L R21 L R22 L R23 and L R24 For the receiving coil of the low-voltage battery, C R21 and C R22 C is the compensation capacitor for the full-wave controlled rectifier bridge. A2 For filtering capacitors; The low-voltage coil at the low-voltage end of the low-voltage battery adopts a four-coil parallel winding structure, that is, the low-voltage coil is designed as four identical coils connected in parallel, and the four coils are concentrated on the same plane to reduce the current that a single coil has to bear and to make the coil structure more compact.

4. The integrated structure of the electric vehicle wireless charging, on-board charging, and auxiliary power system according to claim 1, characterized in that: The circuit topology of the integrated structure has the following operating modes: on-board charging mode, wireless charging mode, high-voltage battery power supply mode to low-voltage battery, power supply to the grid mode, and hybrid charging mode, which is on-board charging and wireless charging mode that simultaneously performs on-board charging and wireless charging.

5. The integrated structure of the electric vehicle wireless charging, on-board charging, and auxiliary power system according to claim 3, characterized in that: When the circuit topology operates in vehicle charging mode, the transmitting coil for wireless charging is switched off and unused. The vehicle charging transmitting coil charges both the high-voltage and low-voltage batteries simultaneously, or it can charge one of the batteries individually.

6. The integrated structure of the electric vehicle wireless charging, on-board charging, and auxiliary power system according to claim 3, characterized in that: When the circuit topology is operating in wireless charging mode, the on-board charging transmitter coil is in a cut-out and unused state. The wireless charging transmitter coil can charge both the high-voltage and low-voltage batteries simultaneously, or it can charge only one of the batteries.

7. The integrated structure of the electric vehicle wireless charging, on-board charging, and auxiliary power system according to claim 3, characterized in that: When the circuit topology operates in hybrid charging mode, the electric vehicle system simultaneously performs on-board charging and wireless charging. At this time, the on-board charging transmitting coil and the external wireless charging transmitting coil simultaneously charge the high-voltage battery and the low-voltage battery, or one of the batteries can be charged at the same time.

8. The integrated structure of the electric vehicle wireless charging, on-board charging, and auxiliary power system according to claim 3, characterized in that: When the circuit topology operates in the mode of supplying power from the high-voltage battery to the low-voltage battery, both the on-board charging transmitter coil and the external wireless charging transmitter coil are disconnected. Depending on the battery usage, the high-voltage battery can charge the low-voltage battery, or the low-voltage battery can charge the high-voltage battery. When the circuit topology operates in the power grid feeding mode, the high-voltage battery emits energy through the high-voltage side coil and the low-voltage side coil, and feeds the power grid through the on-board charging transmitting coil and the wireless charging transmitting coil.

9. The integrated structure of the electric vehicle wireless charging, on-board charging, and auxiliary power system according to claim 3, characterized in that: When inductance compensation is required, the integrated structure uses DD coils, 4D coils, overlapping single-pole coils, or solenoid coils as compensation coils for on-board charging equipment or transmission coils for ground equipment outside the vehicle.

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