Wireless charging system for electric vehicle and electric vehicle

Abstract

This utility model provides a wireless charging system for electric vehicles and an electric vehicle, including a ground transmitter and an on-board receiver. The ground transmitter is connected to the mains voltage, which is filtered and rectified to obtain a DC bus voltage. The DC bus voltage is converted into a high-frequency DC voltage. The high-frequency DC voltage is converted into a high-frequency AC voltage to drive the transmitting coil to generate an alternating magnetic field. A positioning and alignment auxiliary module automatically aligns the ground transmitter with the on-board receiver, aligning the transmitting and receiving coils. The on-board receiver couples with the alternating magnetic field generated by the transmitting coil, inducing a high-frequency AC voltage. The high-frequency AC voltage is rectified into a pulsating DC voltage, which is then filtered to obtain a filtered DC voltage. The filtered DC voltage is adjusted to meet the voltage range required for battery charging. The vehicle position is adaptively adjusted. By coupling the ground transmitter and the on-board receiver, wireless charging of the vehicle is achieved, meeting the vehicle's power requirements.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle charging technology, and in particular to a wireless charging system for electric vehicles and an electric vehicle. Background Technology

[0002] Currently, electric two-wheelers or electric tricycles can be charged using either wired or wireless charging. Wired charging requires frequent plugging and unplugging, and the interfaces are susceptible to corrosion from rain. Wireless charging, on the other hand, is limited by the fact that low-power wireless charging devices (5-50W) cannot meet the power requirements of electric two-wheelers or electric tricycles (350W-6kW), resulting in a poor user experience. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a wireless charging system for electric vehicles and an electric vehicle, which uses a positioning and alignment auxiliary module to assist the ground transmitter in automatically aligning with the vehicle receiver, so that the vehicle position can be adaptively adjusted; by coupling the ground transmitter and the vehicle receiver, wireless charging of the vehicle can be realized, meeting the power requirements of the vehicle and improving the user experience.

[0004] In a first aspect, this utility model provides a wireless charging system for electric vehicles, the system comprising a ground transmitter and an on-board receiver; wherein, the ground transmitter comprises a main power input module, a DC-DC converter and voltage regulator module, a high-frequency inverter and transmitting coil drive module, a positioning and alignment auxiliary module, and a transmitting coil; the on-board receiver comprises a receiving coil module, a high-frequency rectification and filtering module, and a DC-DC converter and battery management interface module, the receiving coil module comprising a receiving coil;

[0005] The main power input module is used to connect to the mains voltage and filter and rectify the mains voltage to obtain the DC bus voltage;

[0006] The DC-DC converter and voltage regulator module is used to convert the DC bus voltage into a high-frequency DC voltage;

[0007] The high-frequency inverter and transmitting coil drive module is used to convert the high-frequency DC voltage into a high-frequency AC voltage and drive the transmitting coil to generate an alternating magnetic field.

[0008] The positioning and alignment assistance module is used to automatically align the ground transmitter with the vehicle-mounted receiver, so that the transmitting coil and the receiving coil are aligned.

[0009] The receiving coil module is used to couple the alternating magnetic field generated by the transmitting coil to induce the high-frequency AC voltage;

[0010] The high-frequency rectification and filtering module is used to rectify the high-frequency AC voltage into a pulsating DC voltage and filter the pulsating DC voltage to obtain a filtered DC voltage.

[0011] The DC-DC converter and battery management interface module is used to adjust the filtered DC voltage to a voltage range that meets the requirements for battery charging.

[0012] Furthermore, the main power input module includes an AC input interface, an EMI filter, and a rectifier bridge;

[0013] The AC input interface is used to input the mains voltage;

[0014] The EMI filter is used to filter the mains voltage to obtain a filtered mains voltage.

[0015] The rectifier bridge is used to rectify the filtered mains voltage to obtain the DC bus voltage.

[0016] Furthermore, the DC-DC conversion and voltage regulation module includes a high-frequency switching power supply topology, a high-frequency power switching transistor, a high-frequency transformer, a resonant capacitor / inductor, and an output filter capacitor;

[0017] The high-frequency switching power supply topology is used to control the energy transfer path through high-frequency switching to achieve efficient DC-DC conversion and voltage regulation.

[0018] The high-frequency power switch is used to chop the DC bus voltage into a high-frequency square wave to drive the high-frequency transformer to transmit energy.

[0019] The high-frequency transformer is used to achieve electrical isolation between input and output, and to step up or step down the voltage by adjusting the turns ratio;

[0020] The resonant capacitor / inductor is used to form the resonant frequency point, and a resonant network is formed based on the resonant frequency point; sinusoidal energy is transmitted through the resonant network.

[0021] The output filter capacitor is used to filter out high-frequency ripple and provide the high-frequency DC voltage.

[0022] Furthermore, the high-frequency inverter and transmitting coil drive module includes a full-bridge inverter circuit, a drive circuit, and a first resonant compensation network;

[0023] The full-bridge inverter circuit is used to convert the high-frequency DC voltage into a high-frequency square wave AC voltage to drive the transmitting coil.

[0024] The drive circuit is used to suppress ringing through the gate driver, provide the required voltage drive power, enable the switching transistor to turn on and off quickly, and ensure reliable operation of the inverter.

[0025] The resonant compensation network is used to compensate for the inductive impedance of the transmitting coil;

[0026] The transmitting coil is used to convert the obtained high-frequency AC voltage into the alternating magnetic field and couple energy to the vehicle-mounted receiver.

[0027] Furthermore, the receiving coil module includes a second resonant compensation network and a shielding layer;

[0028] The receiving coil is used to acquire the alternating magnetic field generated by the transmitting coil and convert the alternating magnetic field into the high-frequency AC voltage;

[0029] The second resonant compensation network is used to compensate for the inductive impedance of the receiving coil;

[0030] The shielding layer is used to shield against magnetic field leakage and interference from in-vehicle components, and to constrain the magnetic field path.

[0031] Furthermore, the high-frequency rectification and filtering module includes a high-frequency rectifier bridge and a filter capacitor;

[0032] The high-frequency rectifier bridge is used to convert the high-frequency AC voltage into the pulsating DC voltage;

[0033] The filter capacitor is used to filter out the high-frequency ripple of the rectified DC voltage and output the filtered DC voltage.

[0034] Furthermore, the DC-DC conversion and battery management interface module includes a DC-DC converter topology, power switching transistors, inductors, capacitors, and a battery management system and interface circuit.

[0035] The DC-DC converter topology is used to adjust the filtered DC voltage to meet the voltage range required for battery charging, thereby achieving constant voltage and constant current.

[0036] The power switch is used to modulate the energy transfer path via PWM;

[0037] The inductor is used for energy storage and filtering to suppress sudden current changes;

[0038] The capacitor is used to filter out high-frequency ripple and maintain voltage stability.

[0039] The battery management system and interface circuit are used to communicate with the BMS in real time and dynamically adjust charging parameters.

[0040] Furthermore, the positioning and alignment assistance module includes guide markers and a mechanical guiding structure;

[0041] The guidance markers are used to provide visual alignment guidance for the system;

[0042] The mechanical guiding structure is used to achieve the alignment action of the ground-based launcher.

[0043] Furthermore, the system also includes an intelligent control center;

[0044] The intelligent control center is used to receive the battery temperature sent by the BMS and control the charging switch according to the battery temperature.

[0045] Secondly, embodiments of this utility model provide an electric vehicle, including a wireless charging system for the electric vehicle as described above.

[0046] This utility model embodiment provides a wireless charging system for electric vehicles and an electric vehicle. The system includes a ground transmitter and an on-board receiver. The ground transmitter includes a main power input module, a DC-DC converter and voltage regulator module, a high-frequency inverter and transmitting coil drive module, a positioning and alignment auxiliary module, and a transmitting coil. The on-board receiver includes a receiving coil module, a high-frequency rectification and filtering module, and a DC-DC converter and battery management interface module. The receiving coil module includes a receiving coil. The main power input module is used to connect to the mains voltage and filter and rectify the mains voltage to obtain a DC bus voltage. The DC-DC converter and voltage regulator module converts the DC bus voltage into a high-frequency DC voltage. The high-frequency inverter and transmitting coil drive module converts the high-frequency DC voltage into a high-frequency AC voltage and drives the transmitting coil. The system employs a dynamic transmitting coil to generate an alternating magnetic field. A positioning and alignment auxiliary module automatically aligns the ground transmitter with the vehicle receiver, ensuring the transmitting and receiving coils are aligned. A receiving coil module couples the alternating magnetic field generated by the transmitting coil, inducing a high-frequency AC voltage. A high-frequency rectification and filtering module rectifies the high-frequency AC voltage into a pulsating DC voltage and filters it to obtain a filtered DC voltage. A DC-DC conversion and battery management interface module adjusts the filtered DC voltage to a range suitable for battery charging. The positioning and alignment auxiliary module assists the ground transmitter in automatically aligning with the vehicle receiver, allowing for adaptive adjustment of the vehicle's position. By coupling the ground transmitter and vehicle receiver, wireless charging of the vehicle is achieved, meeting the vehicle's power requirements and improving the user experience.

[0047] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0048] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0049] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0050] Figure 1 A schematic diagram of a wireless charging system for an electric vehicle provided in Embodiment 1 of this utility model;

[0051] Figure 2 This is a schematic diagram of the structure of the ground transmitter provided in Embodiment 1 of this utility model;

[0052] Figure 3 This is a schematic diagram of the structure of the vehicle-mounted receiver provided in Embodiment 1 of this utility model;

[0053] Figure 4 A schematic diagram illustrating the application scenario of the wireless charging system for electric vehicles provided in Embodiment 1 of this utility model;

[0054] Figure 5 This is a schematic diagram illustrating the working process of the wireless charging system for electric vehicles provided in Embodiment 1 of this utility model.

[0055] icon:

[0056] 1-Ground transmitter; 2-Vehicle receiver; 11-Main power input module; 12-DC-DC converter and voltage regulator module; 13-High-frequency inverter and transmitter coil drive module; 14-Transmitter coil; 21-Receiver coil module; 22-High-frequency rectification and filtering module; 23-DC-DC converter and battery management interface module; 24-Receiver coil; 3-Battery. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0058] To facilitate understanding of this embodiment, the following is a detailed description of the embodiment of this utility model.

[0059] Example 1:

[0060] Figure 1This is a schematic diagram of a wireless charging system for an electric vehicle provided in Embodiment 1 of this utility model.

[0061] Reference Figure 1 The system includes a ground transmitter 1 and a vehicle-mounted receiver 2. The ground transmitter 1 includes a main power input module 11, a DC-DC converter and voltage regulator module 12, a high-frequency inverter and transmitting coil drive module 13, a positioning and alignment auxiliary module, and a transmitting coil 14. The vehicle-mounted receiver 2 includes a receiving coil module 21, a high-frequency rectification and filtering module 22, and a DC-DC converter and battery management interface module 23. The receiving coil module 21 includes a receiving coil 24.

[0062] The main power input module 11 is used to connect to the mains voltage and filter and rectify the mains voltage to obtain the DC bus voltage;

[0063] DC-DC converter and voltage regulator module 12 is used to convert DC bus voltage into high-frequency DC voltage;

[0064] The high-frequency inverter and transmitting coil drive module 13 is used to convert high-frequency DC voltage into high-frequency AC voltage and drive the transmitting coil to generate an alternating magnetic field.

[0065] The positioning and alignment auxiliary module is used to automatically align the ground transmitter with the vehicle-mounted receiver 2, so that the transmitting coil 14 and the receiving coil module 21 are aligned.

[0066] The receiving coil module 21 is used to couple the alternating magnetic field generated by the transmitting coil to induce a high-frequency AC voltage;

[0067] The high-frequency rectification and filtering module 22 is used to rectify the high-frequency AC voltage into a pulsating DC voltage and filter the pulsating DC voltage to obtain a filtered DC voltage.

[0068] The DC-DC conversion and battery management interface module 23 is used to adjust the filtered DC voltage to a voltage range that meets the requirements for battery charging.

[0069] Furthermore, the main power input module 11 includes an AC input interface, an EMI filter, and a rectifier bridge;

[0070] AC input interface, used for inputting mains voltage;

[0071] An EMI filter is used to filter the mains voltage to obtain a filtered mains voltage.

[0072] A rectifier bridge is used to rectify the filtered mains voltage to obtain the DC bus voltage.

[0073] Specifically, the AC input interface is used to connect to the 220V AC mains voltage, connecting to the power grid via a standard plug / terminal. It has a built-in fuse or circuit breaker to provide primary overcurrent / short-circuit protection. The EMI filter is used to suppress high-frequency noise interference conducted bidirectionally between the power grid and the equipment, prevent high-frequency harmonics generated by switching devices such as rectifier bridges from flowing back into the power grid, filter out sudden surges, voltage spikes, or high-frequency interference in the power grid, and protect subsequent circuits. The rectifier bridge is used to convert alternating current (AC) into pulsating direct current (DC), providing input for subsequent DC-DC conversion and voltage regulation modules.

[0074] Furthermore, refer to Figure 2 The DC-DC conversion and voltage regulation module 12 includes a high-frequency switching power supply topology, a high-frequency power switching transistor, a high-frequency transformer, a resonant capacitor / inductor, and an output filter capacitor.

[0075] High-frequency switching power supply topology is used to control the energy transfer path through high-frequency switching to achieve efficient DC-DC conversion and voltage regulation;

[0076] High-frequency power switching transistors are used to chop the DC bus voltage into a high-frequency square wave to drive a high-frequency transformer to transfer energy.

[0077] High-frequency transformers are used to achieve electrical isolation between input and output, and to step up or step down voltage by adjusting the turns ratio.

[0078] Resonant capacitors / inductors are used to establish resonant frequency points, and resonant networks are constructed based on these resonant frequency points; sinusoidal energy is then transmitted through these resonant networks.

[0079] Output filter capacitors are used to filter out high-frequency ripple and provide high-frequency DC voltage.

[0080] Specifically, high-frequency switching power supply topologies include LLC resonant converters and phase-shifted full-bridge converters. Their main function is to control the energy transfer path through high-frequency switching, achieving efficient DC-DC conversion and voltage regulation. The LLC resonant converter utilizes a resonant cavity to achieve zero-voltage switching (ZVS) for the switching transistors and zero-current switching (ZCS) for the diodes, reducing switching losses and achieving an efficiency of up to 98%; simultaneously, it controls the output voltage by adjusting the switching frequency. The phase-shifted full-bridge converter achieves zero-voltage switching through phase-shift control and is suitable for medium to high power applications.

[0081] High-frequency power transistors act as "electronic switches" in the topology, rapidly switching on and off according to control signals to modulate the energy flow. Specifically, their function is to chop the DC input into a high-frequency square wave, driving a high-frequency transformer to transfer energy.

[0082] The main function of a high-frequency transformer (electrical isolation) is to transfer energy and achieve input-output electrical isolation by stepping up or down the turns ratio.

[0083] Resonant capacitor / inductor: The resonant capacitor and resonant inductor are connected in series to form the resonant frequency point, which constitutes a resonant network, creates soft switching conditions and transmits sinusoidal energy, and acts as an output filter capacitor (to filter out high-frequency ripple and provide a smooth voltage to the downstream).

[0084] Furthermore, the high-frequency inverter and transmitting coil drive module 13 includes a full-bridge inverter circuit, a drive circuit, and a first resonant compensation network;

[0085] A full-bridge inverter circuit is used to convert high-frequency DC voltage into high-frequency square wave AC voltage to drive the transmitting coil;

[0086] The drive circuit is used to suppress ringing through the gate driver, provide the required voltage drive power, enable the switching transistor to turn on and off quickly, and ensure reliable operation of the inverter.

[0087] A resonant compensation network is used to compensate for the inductive impedance of the transmitting coil;

[0088] The transmitting coil is used to convert the obtained high-frequency AC voltage into an alternating magnetic field and couple energy to the vehicle-mounted receiver.

[0089] Specifically, the full-bridge inverter circuit includes a high-frequency power switch to convert the DC input into a high-frequency square wave AC voltage to drive the transmitting coil 14.

[0090] The drive circuit is used to suppress ringing through the gate driver, provide sufficient voltage drive power, and enable the switching transistor to turn on and off quickly, ensuring reliable operation of the inverter.

[0091] The first resonant compensation network includes Scheme 1, Scheme 2, and Scheme 3; where Scheme 1 uses series capacitor compensation; Scheme 2 uses parallel capacitor compensation; and Scheme 3 uses an inductor + capacitor + coil. All three schemes compensate for the inductive impedance of the transmitting coil.

[0092] The transmitting coil 14 is used to convert high-frequency AC voltage into an alternating magnetic field, which couples energy to the receiving coil of the vehicle-mounted receiver to drive the resonance of the receiving coil.

[0093] The high-frequency inverter and transmitting coil drive module 13 is used to convert high-frequency DC voltage into high-frequency AC voltage to drive the transmitting coil 14 to generate an alternating magnetic field.

[0094] The first resonant compensation network is used to optimize power transmission efficiency and achieve zero-current switching.

[0095] In addition, the ground transmitter 1 also includes a first heat dissipation system and a first auxiliary power module; the first heat dissipation system includes heat sinks (aluminum / copper), fans (forced air cooling), heat pipes, and liquid cooling plates (for ultra-high power). The first heat dissipation system is used to effectively dissipate heat from power switching transistors, coils, rectifier bridges, and other heat-generating components, ensuring stable operation of the system in high-temperature environments.

[0096] The first auxiliary power supply module is a low-power power supply, whose main function is to provide a stable low-voltage DC power supply for the control circuits, communication modules, sensors and fans of the ground transmitter.

[0097] Furthermore, the positioning and alignment assistance module includes guide markers and a mechanical guidance structure;

[0098] Guidance markers are used to provide visual alignment guidance for the system;

[0099] A mechanical guidance structure is used to achieve the alignment action of the ground-based launcher.

[0100] Specifically, the guidance markers provide visual alignment guidance for the system by setting bottom positioning markers and using visual equipment for imaging; the mechanical guidance structure enables the ground launch device to perform alignment actions.

[0101] Positioning and alignment assistance module function: It uses vision equipment for positioning and mechanical guide structure for guiding action to achieve precise alignment between the ground transmitter and the vehicle receiver.

[0102] Furthermore, refer to Figure 3 The receiving coil module 21 includes a second resonant compensation network and a shielding layer;

[0103] The receiving coil 24 is used to acquire the alternating magnetic field generated by the transmitting coil and convert the alternating magnetic field into a high-frequency AC voltage;

[0104] The second resonant compensation network is used to compensate for the inductive impedance of the receiving coil;

[0105] The shielding layer is used to shield against magnetic field leakage and interference from in-vehicle components, and to constrain the magnetic field path.

[0106] Specifically, the receiving coil 24 uses a DD coil that is matched with the ground transmitter 1 to capture the alternating magnetic field generated by the transmitting coil 14 and convert it into a high-frequency AC voltage.

[0107] The second resonant compensation network is matched with the connection form of the ground transmitter, such as series or series-parallel connection, to compensate for the inductive impedance of the receiving coil.

[0108] The shielding layer can reduce magnetic field leakage and interference to in-vehicle components, constrain the magnetic field path, reduce magnetic leakage interference, and improve coupling efficiency.

[0109] Furthermore, the high-frequency rectification and filtering module 22 includes a high-frequency rectifier bridge and a filter capacitor;

[0110] A high-frequency rectifier bridge is used to convert high-frequency AC voltage into pulsating DC voltage.

[0111] The filter capacitor is used to filter out the high-frequency ripple of the rectified DC voltage and output the filtered DC voltage.

[0112] Specifically, the high-frequency rectifier bridge includes a fast recovery diode or a synchronous rectifier MOSFET, which converts the high-frequency AC voltage output from the vehicle receiver into a pulsating DC voltage.

[0113] The filter capacitors include a combination of electrolytic capacitors and ceramic capacitors, which filter out the high-frequency ripple of the rectified output to smooth the DC voltage, thus preparing for the subsequent DC-DC conversion and battery management interface module 23.

[0114] Furthermore, the DC-DC conversion and battery management interface module 23 includes a DC-DC converter topology, power switching transistors, inductors, capacitors, and a battery management system and interface circuit.

[0115] A DC-DC converter topology is used to adjust the filtered DC voltage to meet the voltage range required for charging battery 3, thereby achieving constant voltage and constant current.

[0116] Power switching transistors are used to modulate the energy transfer path via PWM.

[0117] Inductors are used for energy storage and filtering to suppress sudden current changes;

[0118] Capacitors are used to filter out high-frequency ripple and maintain voltage stability.

[0119] The battery management system and interface circuit are used to communicate with the BMS in real time and dynamically adjust charging parameters.

[0120] Specifically, the DC-DC converter topology is used to convert the rectified and filtered DC voltage into a stable DC voltage matched to the battery, achieving constant voltage and constant current. The power switching transistors act as the "high-speed switches" of the topology, modulating the energy transfer path through PWM (Pulse Width Modulation). Inductors are used for energy storage and filtering, suppressing current surges. Capacitors are used to filter out high-frequency ripple and maintain voltage stability.

[0121] The battery management system and interface circuit communicate with the vehicle's BMS in real time to dynamically adjust charging parameters and implement protection.

[0122] The DC-DC conversion and battery management interface module 23 adjusts the rectified and filtered DC voltage to a voltage range suitable for charging battery 3, thereby achieving constant current (CC) and constant voltage (CV) charging control.

[0123] In addition, the vehicle-mounted receiver also includes a second cooling system and a second auxiliary power module; the second cooling system includes heat sinks and heat pipes, utilizing the vehicle body for heat dissipation. The function of the second cooling system is to dissipate heat from heat-generating components such as the receiving coil, rectifier, and DC-DC converter.

[0124] The second auxiliary power module includes a low-power DC-DC converter (which can draw power from received wireless energy or from a battery).

[0125] The function of the second auxiliary power module is to provide a stable low-voltage DC power supply for the control circuit, communication module, and sensors of the vehicle-mounted receiver.

[0126] Furthermore, refer to Figure 5 The system also includes an intelligent control center;

[0127] The intelligent control center receives the battery temperature data sent by the BMS and controls the charging switch based on the battery temperature.

[0128] Specifically, the intelligent control center has the following functions:

[0129] 1) Start-up and shutdown;

[0130] 2) The vehicle-mounted BMS continuously monitors the battery temperature, and the control center controls the charging switch to avoid low-temperature lithium plating / high-temperature thermal runaway, extending battery life by 30%.

[0131] 3) Multi-level safety interlocks: 11) Overcurrent / short circuit, fuse physically disconnects; 12) Shut down driver IC; 13) BMS alarm / FOD trigger; 14) If multiple authentication failures occur during charging start-up, remotely lock the charging station.

[0132] 4) Parameter display: Display of time, device information, charging voltage, charging current, charging speed, charging time and positioning accuracy.

[0133] It also includes a starting device, a position detection sensor, and an automatic alignment mechanism. The starting device is used to start the system, and the position detection sensor is used to detect the vehicle's current position information.

[0134] Reference Figure 4 When the system is applied to home garages or charging station scenarios, the ground transmitter is a pre-embedded waterproof transmitter plate, and the vehicle receiver is integrated into the bottom of the vehicle's central axle. When the vehicle enters the parking position and the personnel move away from the vehicle within a certain distance, the system is activated, either by the system itself or by an external activation button; the automatic lifting platform rises; the alignment device automatically adjusts the position of the ground transmitter and aligns it; power parameters can be manually set or the system can automatically read battery chip information to set the power for wireless charging; charging is automatically / manually cut off based on the set charging time or information such as the sensed battery charging status.

[0135] When the system is applied to public charging stations, based on the above scenario, a QR code scanning device can be set up to enable scanning control of charging at public charging stations. The intelligent control center receives information from the BMS (Battery Management System) and transmits information back to the BMS via an interface circuit.

[0136] An electric vehicle, comprising a wireless charging system for the electric vehicle as described above.

[0137] The computer program product provided in this embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods described in the preceding method embodiments. For specific implementation details, please refer to the method embodiments, which will not be repeated here.

[0138] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0139] Furthermore, in the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0140] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this utility model, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this utility model. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0141] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0142] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A wireless charging system for electric vehicles, characterized in that, The system includes a ground transmitter and a vehicle-mounted receiver; wherein, the ground transmitter includes a main power input module, a DC-DC converter and voltage regulator module, a high-frequency inverter and transmitting coil drive module, a positioning and alignment auxiliary module, and a transmitting coil; the vehicle-mounted receiver includes a receiving coil module, a high-frequency rectification and filtering module, and a DC-DC converter and battery management interface module, wherein the receiving coil module includes a receiving coil; The main power input module is used to connect to the mains voltage and filter and rectify the mains voltage to obtain the DC bus voltage; The DC-DC converter and voltage regulator module is used to convert the DC bus voltage into a high-frequency DC voltage; The high-frequency inverter and transmitting coil drive module is used to convert the high-frequency DC voltage into a high-frequency AC voltage and drive the transmitting coil to generate an alternating magnetic field. The positioning and alignment assistance module is used to automatically align the ground transmitter with the vehicle-mounted receiver, so that the transmitting coil and the receiving coil are aligned. The receiving coil module is used to couple the alternating magnetic field generated by the transmitting coil to induce the high-frequency AC voltage; The high-frequency rectification and filtering module is used to rectify the high-frequency AC voltage into a pulsating DC voltage and filter the pulsating DC voltage to obtain a filtered DC voltage. The DC-DC converter and battery management interface module is used to adjust the filtered DC voltage to a voltage range that meets the requirements for battery charging.

2. The wireless charging system of the electric vehicle of claim 1, wherein, The main power input module includes an AC input interface, an EMI filter, and a rectifier bridge; The AC input interface is used to input the mains voltage; The EMI filter is used to filter the mains voltage to obtain a filtered mains voltage. The rectifier bridge is used to rectify the filtered mains voltage to obtain the DC bus voltage.

3. The wireless charging system of the electric vehicle of claim 1, wherein, The DC-DC conversion and voltage regulation module includes a high-frequency switching power supply topology, a high-frequency power switching transistor, a high-frequency transformer, a resonant capacitor / inductor, and an output filter capacitor. The high-frequency switching power supply topology is used to control the energy transfer path through high-frequency switching to achieve efficient DC-DC conversion and voltage regulation. The high-frequency power switch is used to chop the DC bus voltage into a high-frequency square wave to drive the high-frequency transformer to transmit energy. The high-frequency transformer is used to achieve electrical isolation between input and output, and to step up or step down the voltage by adjusting the turns ratio; The resonant capacitor / inductor is used to form the resonant frequency point, and a resonant network is formed based on the resonant frequency point; sinusoidal energy is transmitted through the resonant network. The output filter capacitor is used to filter out high-frequency ripple and provide the high-frequency DC voltage.

4. The wireless charging system of the electric vehicle of claim 1, wherein, The high-frequency inverter and transmitting coil drive module includes a full-bridge inverter circuit, a drive circuit, and a first resonant compensation network. The full-bridge inverter circuit is used to convert the high-frequency DC voltage into a high-frequency square wave AC voltage to drive the transmitting coil. The drive circuit is used to suppress ringing through the gate driver, provide the required voltage drive power, enable the switching transistor to turn on and off quickly, and ensure reliable operation of the inverter. The resonant compensation network is used to compensate for the inductive impedance of the transmitting coil; The transmitting coil is used to convert the obtained high-frequency AC voltage into the alternating magnetic field and couple energy to the vehicle-mounted receiver.

5. The wireless charging system of the electric vehicle of claim 1, wherein, The receiving coil module includes a second resonant compensation network and a shielding layer; The receiving coil is used to acquire the alternating magnetic field generated by the transmitting coil and convert the alternating magnetic field into the high-frequency AC voltage; The second resonant compensation network is used to compensate for the inductive impedance of the receiving coil; The shielding layer is used to shield against magnetic field leakage and interference from in-vehicle components, and to constrain the magnetic field path.

6. The wireless charging system for electric vehicles according to claim 1, characterized in that, The high-frequency rectification and filtering module includes a high-frequency rectifier bridge and a filter capacitor; The high-frequency rectifier bridge is used to convert the high-frequency AC voltage into the pulsating DC voltage; The filter capacitor is used to filter out the high-frequency ripple of the rectified DC voltage and output the filtered DC voltage.

7. The wireless charging system of the electric vehicle of claim 1, wherein, The DC-DC conversion and battery management interface module includes a DC-DC converter topology, power switching transistors, inductors, capacitors, and a battery management system and interface circuit. The DC-DC converter topology is used to adjust the filtered DC voltage to meet the voltage range required for battery charging, thereby achieving constant voltage and constant current. The power switch is used to modulate the energy transfer path via PWM; The inductor is used for energy storage and filtering to suppress sudden current changes; The capacitor is used to filter out high-frequency ripple and maintain voltage stability; The battery management system and interface circuit are used to communicate with the BMS in real time and dynamically adjust charging parameters.

8. The wireless charging system of the electric vehicle of claim 1, wherein, The positioning and alignment assistance module includes guide markers and a mechanical guiding structure; The guidance markers are used to provide visual alignment guidance for the system; The mechanical guiding structure is used to achieve the alignment action of the ground-based launcher.

9. The wireless charging system for electric vehicles according to claim 1, characterized in that, The system also includes an intelligent control center; The intelligent control center is used to receive the battery temperature sent by the BMS and control the charging switch according to the battery temperature.

10. An electric vehicle, characterized by The wireless charging system for electric vehicles as described in any one of claims 1 to 9.

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