Stereo garage electric vehicle wireless charging system and control method

Abstract

The invention relates to the technical field of wireless electric energy transmission, in particular to a stereo garage electric vehicle wireless charging system and a control method, the system comprises a stereo garage fixed transmitting terminal, the stereo garage fixed transmitting terminal comprises a power grid power supply, a power frequency rectification circuit, a high frequency inversion device and a fixed transmitting coil; the mobile parking space relay end comprises a first relay coil, a second relay coil, a coupling coil relay energy taking circuit, a current detection module, a wireless communication module, a rectification voltage regulation circuit and a forced air cooling type heat dissipation device; the vehicle-mounted receiving end comprises a vehicle-mounted receiving coil, a rectifying device and a vehicle-mounted rechargeable battery; wherein the relay energy taking circuit is coupled with the fixed transmitting coil through the first relay coil to obtain electric energy, near-field power supply is provided for the forced air cooling type heat dissipation device, and the electric energy is coupled with the vehicle-mounted receiving coil through the second relay coil to charge the vehicle-mounted rechargeable battery.

Description

Technical Field

[0001] This invention relates to the field of wireless power transmission technology, and in particular to a wireless charging system and control method for electric vehicles in a multi-level parking garage. Background Technology

[0002] With the increasing scarcity of land resources and the high cost of parking lot construction, multi-level parking garages have become widely used due to their high space utilization rate. Meanwhile, electric vehicles have attracted more and more attention and use due to their economic, environmentally friendly, flexible and intelligent advantages.

[0003] Currently, most multi-level parking garages are not equipped with electric vehicle charging facilities, and the existing charging equipment mostly uses wired charging methods such as wired charging with electric wires and cables. These are easily affected by the movement of the vehicle platform, resulting in frequent pulling and wear, which poses certain safety risks. The few wireless charging devices available often struggle to identify whether an electric vehicle needs wireless charging, leading to wasted energy and low overall system efficiency.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] This invention provides a wireless charging system and control method for electric vehicles in a multi-level parking garage, thereby effectively solving the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this invention is: a wireless charging system for electric vehicles in a multi-level parking garage, comprising: The fixed transmitter of the automated parking garage includes: a mains power supply, a power frequency rectifier circuit, a high frequency inverter device, and a fixed transmitting coil; The mobile parking space relay terminal includes: a first relay coil, a second relay coil, a coupling coil relay power extraction circuit, a current detection module, a wireless communication module, a rectifier voltage regulation circuit, and a forced air cooling heat dissipation device. The vehicle-mounted receiver includes: a vehicle-mounted receiving coil, a rectifier, and a vehicle-mounted rechargeable battery; The relay power circuit obtains electrical energy through coupling the first relay coil with the fixed transmitting coil to provide near-field power to the forced air-cooled heat dissipation device. The electrical energy is coupled with the vehicle-mounted receiving coil through the second relay coil to charge the vehicle-mounted rechargeable battery.

[0007] Furthermore, the fixed transmitting coil and the first relay coil are square planar spiral coils; The second relay coil is composed of three horizontally placed rectangular planar coils connected in series, with adjacent rectangular coils wound in opposite directions; the vehicle-mounted receiving coil is composed of two horizontally placed rectangular planar coils connected in series, with the two rectangular coils wound in opposite directions. The second relay coil and the receiving coil are arranged along the long side of the moving vehicle platform.

[0008] Furthermore, the fixed transmitting coil is vertically installed above the front of the parking space in the multi-level parking garage; the first relay coil is vertically installed in front of the movable vehicle platform, so that when the vehicle platform is reset, the first relay coil and the fixed transmitting coil are in close corresponding positions. The second relay coil is horizontally installed above the center of the mobile vehicle platform and connected in series with the first relay coil via twisted Litz wire; the vehicle-mounted receiving coil is horizontally installed at the bottom of the electric vehicle, and during charging, the receiving coil is located in the area directly above the second relay coil.

[0009] Furthermore, the fixed transmitter of the three-dimensional parking garage is equipped with an LCC-type compensation topology; The mobile parking space relay terminal is equipped with two integrated compensation capacitors, which are connected in series with the first relay coil and the second relay coil respectively for compensation. The vehicle-mounted receiver is equipped with a compensation capacitor to compensate the vehicle-mounted receiver coil in series.

[0010] Furthermore, it also includes the following conditions: For the fixed transmitter of the multi-level parking garage, we have: , ; For two coils connected in series in the same circuit at the relay terminal of the mobile parking space, we have: , ; For the vehicle-mounted receiver, there are: ; In the formula, The system angular frequency, , , , These are the equivalent inductances of the transmitting coil, the first relay coil, the second relay coil, and the receiving coil, respectively. , , For the inductance and capacitance of the LCC compensation circuit, , These are two integrated compensation capacitors at the relay terminal of the mobile parking space. This is the compensation capacitor for the vehicle-mounted receiver.

[0011] Furthermore, an energy harvesting coil is stacked above the first relay coil and the second relay coil respectively, and the energy harvesting coil obtains electrical energy through strong magnetic field coupling with the corresponding relay coil; The energy harvesting circuit does not have a compensation circuit. The electrical energy is directly supplied to the heat dissipation device after being rectified by a full-bridge rectifier and voltage regulation. The relay energy harvesting circuit is a passive circuit structure without energy storage and wired power supply. The energy harvesting, rectification, voltage regulation and forced air cooling heat dissipation device are integrated on the back of the coil.

[0012] This invention also includes a control method for a wireless charging system for electric vehicles in a multi-level parking garage, applied to the system described above, the method comprising the following steps: Measure the rectified output voltage of the relay terminal power extraction circuit. ; Will Compare with a preset threshold; if If the current exceeds the preset threshold, the mobile parking space relay will send an overcurrent / no-load indication to the fixed transmitter of the automated parking garage via the wireless communication module, causing the transmitter to reduce the output voltage or reduce the output power. like If the current is less than or equal to the preset threshold, the transmitter will maintain normal output and charging will be allowed; and the relay circuit current will be monitored and overcurrent protected throughout the process.

[0013] Furthermore, the rectified output voltage of the measurement relay terminal power extraction circuit... ,include: Measure the output voltage of the rectifier circuit of the first energy harvesting circuit. The voltage of the energy harvesting circuit input to the full-bridge rectifier circuit. Relay circuit current , The mutual inductance between the first relay coil and the energy extraction coil is derived through calculation. Relationship with relay coil circuit current: ; By monitoring the rectified output voltage U of the first energy harvesting circuit T This enables the detection of relay coil circuit current and overcurrent protection.

[0014] The present invention also includes a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method as described above.

[0015] The present invention also includes a storage medium having a computer program stored thereon, which, when executed by a processor, implements the method as described above.

[0016] The beneficial effects of this invention are as follows: Currently, most automated parking garages are not equipped with electric vehicle charging equipment, and existing charging equipment mostly uses wired charging methods such as wires and cables, which are easily affected by the movement of the vehicle carrier platform, resulting in frequent pulling and wear, posing certain safety risks. This invention proposes a wireless charging system for electric vehicles in automated parking garages, in which the freely moving vehicle carrier platform is not bound by cables. It also solves the problems of coil heat dissipation and anti-no-load during the wireless charging process of electric vehicles in automated parking garages. The heat dissipation components of the mobile relay end do not rely on wired power supply or energy storage, improving the overall system's economy, safety, and reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a wireless charging system for electric vehicles in a multi-level parking garage.

[0019] Figure 2 A schematic diagram of the relay power supply circuit and the anti-no-load detection for the heat dissipation device of the wireless charging system for electric vehicles in a multi-level parking garage.

[0020] Figure 3 This is a schematic diagram of relay coil 1 and relay coil 2 in a wireless charging system for electric vehicles in a multi-level parking garage.

[0021] Figure 4 This is a schematic diagram showing the location of the coil structure in a wireless charging system for electric vehicles in a multi-level parking garage.

[0022] Figure 5 The equivalent circuit diagram of a wireless charging system for electric vehicles in a multi-level parking garage.

[0023] Figure 6 This is a circuit diagram of the relay power supply circuit for the heat dissipation device of the wireless charging system for electric vehicles in a multi-level parking garage.

[0024] Figure 7 A flowchart illustrating the anti-idle load strategy for the heat dissipation device of the wireless charging system for electric vehicles in a multi-level parking garage.

[0025] Figure 8 This is a schematic diagram of the structure of the computer device of the present invention. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] like Figure 1 and Figure 2 As shown: A wireless charging system for electric vehicles in a multi-level parking garage, comprising: The fixed transmitter of the multi-level parking garage includes: a mains power supply 1, a power frequency rectifier circuit 2, a high frequency inverter 3, and a fixed transmitting coil 4; Mobile parking space relay terminal, the mobile parking space relay terminal includes: first relay coil 5 ( Figure 2 The first relay coil 1 and the second relay coil 6 are located in the middle. Figure 2 The relay coil 2), coupling coil relay power extraction circuit, current detection module, wireless communication module, rectifier voltage regulation circuit and forced air cooling heat dissipation device; The vehicle-mounted receiver includes: a vehicle-mounted receiving coil 7, a rectifier 8, and a vehicle-mounted rechargeable battery 9. The relay power circuit obtains electrical energy through coupling the first relay coil 5 with the fixed transmitting coil 4, providing near-field power supply for the forced air-cooled heat dissipation device. The electrical energy is coupled to the vehicle receiving coil 7 through the second relay coil 6 to charge the vehicle rechargeable battery 9.

[0028] like Figure 3 As shown, the fixed transmitting coil and the first relay coil are square planar spiral coils; The second relay coil consists of three horizontally placed rectangular planar coils connected in series, with adjacent rectangular coils wound in opposite directions; the vehicle-mounted receiving coil consists of two horizontally placed rectangular planar coils connected in series, with the two rectangular coils wound in opposite directions. The second relay coil and the receiving coil are arranged along the long side of the moving vehicle platform.

[0029] like Figure 4 As shown, the fixed transmitting coil is vertically installed above the front of parking space 11 in the multi-level parking garage; the first relay coil 5 is vertically installed in front of the movable vehicle platform 12, so that when the vehicle platform is reset, the first relay coil 5 and the fixed transmitting coil 4 are in close corresponding positions. The second relay coil 6 is horizontally installed above the center of the mobile vehicle platform 12 and connected in series with the first relay coil 5 via twisted Litz wire; the vehicle-mounted receiving coil 7 is horizontally installed at the bottom of the electric vehicle 10, and during charging, the vehicle-mounted receiving coil 7 is located in the area directly above the second relay coil 6.

[0030] like Figure 5 As shown, the fixed transmitter of the automated parking garage is equipped with an LCC-type compensation topology; The mobile parking space relay terminal is equipped with two integrated compensation capacitors, which are connected in series with the first relay coil and the second relay coil respectively to compensate for the voltage stress of the relay terminal components and improve the system integration. The vehicle-mounted receiver is equipped with a compensation capacitor to compensate the vehicle-mounted receiver coil in series.

[0031] As a preferred embodiment of the above, the following conditions are also included: For the fixed transmitter of the multi-level parking garage, we have: , ; For two coils connected in series in the same circuit at the relay terminal of the mobile parking space, we have: , ; For the vehicle-mounted receiver, there are: ; In the formula, The system angular frequency, , , , These are the equivalent inductances of the transmitting coil, the first relay coil, the second relay coil, and the receiving coil, respectively. , , For the inductance and capacitance of the LCC compensation circuit, , These are two integrated compensation capacitors at the relay terminal of the mobile parking space. This is the compensation capacitor for the vehicle-mounted receiver.

[0032] like Figure 2 , Figure 6 As shown, an energy harvesting coil is stacked above the first and second relay coils respectively, and the energy harvesting coil obtains electrical energy through strong magnetic field coupling with the corresponding relay coil. The energy extraction circuit does not have a compensation circuit. The electrical energy is directly supplied to the heat dissipation device after being rectified by a full-bridge rectifier and voltage regulation. The relay power circuit is a passive circuit structure without energy storage and wired power supply. The power extraction, rectification, voltage regulation and forced air cooling heat dissipation devices are integrated on the back of the coil.

[0033] As a passive system, the relay power supply circuit can effectively improve the economy, safety, and reliability of wireless charging systems. Furthermore, the heat dissipation device is driven by energy coupling, resulting in rapid response and easy maintenance. For example, through calculation and analysis, a design utilizes a voltage-regulating capacitor to adjust the rectifier circuit output voltage to 12V DC, powering three fans. This effectively promotes heat dissipation of the relay coil and prevents the relay power supply circuit from excessively affecting electric vehicle charging. Simultaneously, a capacitor array is used to construct a compensation capacitor, reducing losses in this stage and improving heat dissipation.

[0034] like Figure 7 This embodiment also includes a control method for a wireless charging system for electric vehicles in a multi-level parking garage, applied to the system described above. The method includes the following steps: Measure the rectified output voltage of the relay terminal power extraction circuit. ; Will Compare with a preset threshold; if If the current exceeds the preset threshold, the mobile parking space relay will send an overcurrent / no-load indication to the fixed transmitter of the automated parking garage via the wireless communication module, causing the transmitter to reduce the output voltage or reduce the output power. like If the current is less than or equal to the preset threshold, the transmitter will maintain normal output and charging will be allowed; and the relay circuit current will be monitored and overcurrent protected throughout the process.

[0035] By monitoring the rectified output voltage U of the relay terminal power extraction circuit 1 T This enables the detection of relay coil circuit current and overcurrent protection. It also allows for real-time monitoring of U... T With preset threshold When comparing, when U T Greater than When U indicates an overcurrent in the relay circuit, the passive monitoring device's wireless communication module at the mobile parking space relay end transmits the overcurrent signal to the fixed transmitter in the automated parking garage. Based on this signal, the transmitter determines that no electric vehicle currently requires wireless charging in that parking space, and thus outputs a low voltage to protect the transmitter's core components, reduce losses to improve system efficiency, and avoid electromagnetic interference to enhance system stability and reliability. Conversely, if U... T Less than This indicates that the relay circuit current is within the allowable range for normal charging, there is currently an electric vehicle needing charging in the parking space, the fixed transmitter of the automated parking garage has not received an overcurrent signal, and the transmitting coil is operating normally. Therefore, by detecting the rectified output voltage U of the relay terminal's energy extraction circuit 1... T It can determine whether there are electric vehicles that need wireless charging accessing the parking space and can effectively prevent empty-load control.

[0036] Among them, the rectified output voltage of the relay terminal power extraction circuit is measured. ,include: Measure the output voltage of the rectifier circuit in the first energy harvesting circuit. The voltage of the energy harvesting circuit input to the full-bridge rectifier circuit. Relay circuit current , The mutual inductance between the first relay coil and the energy extraction coil is derived through calculation. Relationship with relay coil circuit current: ; By monitoring the rectified output voltage U of the first energy harvesting circuit T This enables the detection of relay coil circuit current and overcurrent protection.

[0037] Currently, most automated parking garages lack electric vehicle charging equipment, and existing charging devices primarily use wired methods such as wired charging with cables. These are highly susceptible to damage from frequent pulling and wear caused by the movement of the vehicle carrier platform, posing certain safety risks. This embodiment proposes a wireless charging system for electric vehicles in automated parking garages, where the freely moving vehicle carrier platform is not bound by cables. This embodiment also solves the problems of coil heat dissipation and preventing no-load operation during the wireless charging process of electric vehicles in automated parking garages. The heat dissipation components of the mobile relay terminal do not rely on wired power supply or energy storage, improving the overall system's economy, safety, and reliability.

[0038] Please see Figure 8 The diagram shows a structural schematic of a computer device provided in an embodiment of this application. An embodiment of this application provides a computer device 400, including a processor 410 and a memory 420. The memory 420 stores a computer program executable by the processor 410. When the computer program is executed by the processor 410, it performs the method described above.

[0039] This application embodiment also provides a storage medium 430, on which a computer program is stored, and the computer program is executed by a processor 410 to perform the above method.

[0040] The storage medium 430 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0041] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0045] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0046] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0047] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0048] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A wireless charging system for electric vehicles in a multi-level parking garage, characterized in that, include: The fixed transmitter of the automated parking garage includes: a mains power supply, a power frequency rectifier circuit, a high frequency inverter device, and a fixed transmitting coil; The mobile parking space relay terminal includes: a first relay coil, a second relay coil, a coupling coil relay power extraction circuit, a current detection module, a wireless communication module, a rectifier voltage regulation circuit, and a forced air cooling heat dissipation device. The vehicle-mounted receiver includes: a vehicle-mounted receiving coil, a rectifier, and a vehicle-mounted rechargeable battery; The relay power circuit obtains electrical energy through coupling the first relay coil with the fixed transmitting coil to provide near-field power to the forced air-cooled heat dissipation device. The electrical energy is coupled with the vehicle-mounted receiving coil through the second relay coil to charge the vehicle-mounted rechargeable battery.

2. The wireless charging system for electric vehicles in a multi-level parking garage according to claim 1, characterized in that, The fixed transmitting coil and the first relay coil are square planar spiral coils; The second relay coil is composed of three horizontally placed rectangular planar coils connected in series, with adjacent rectangular coils wound in opposite directions; the vehicle-mounted receiving coil is composed of two horizontally placed rectangular planar coils connected in series, with the two rectangular coils wound in opposite directions. The second relay coil and the receiving coil are arranged along the long side of the moving vehicle platform.

3. The wireless charging system for electric vehicles in a multi-level parking garage according to claim 1, characterized in that, The fixed transmitting coil is vertically installed above the front of the parking space in the multi-level parking garage; the first relay coil is vertically installed in front of the movable vehicle platform, so that when the vehicle platform is reset, the first relay coil and the fixed transmitting coil are in close corresponding positions. The second relay coil is horizontally installed above the center of the mobile vehicle platform and connected in series with the first relay coil via twisted Litz wire; the vehicle-mounted receiving coil is horizontally installed at the bottom of the electric vehicle, and during charging, the receiving coil is located in the area directly above the second relay coil.

4. The wireless charging system for electric vehicles in a multi-level parking garage according to claim 1, characterized in that, The fixed transmitter of the three-dimensional parking garage is equipped with an LCC-type compensation topology; The mobile parking space relay terminal is equipped with two integrated compensation capacitors, which are connected in series with the first relay coil and the second relay coil respectively for compensation. The vehicle-mounted receiver is equipped with a compensation capacitor to compensate the vehicle-mounted receiver coil in series.

5. The wireless charging system for electric vehicles in a multi-level parking garage according to claim 4, characterized in that, It also includes the following conditions: For the fixed transmitter of the automated parking garage, we have: ， ； For two coils connected in series in the same circuit at the relay terminal of the mobile parking space, we have: ， ； For the vehicle-mounted receiver, there are: ； In the formula, The system angular frequency, , , , These are the equivalent inductances of the transmitting coil, the first relay coil, the second relay coil, and the receiving coil, respectively. , , For the inductance and capacitance of the LCC compensation circuit, , These are two integrated compensation capacitors at the relay terminal of the mobile parking space. This is the compensation capacitor for the vehicle-mounted receiver.

6. The wireless charging system for electric vehicles in a multi-level parking garage according to claim 1, characterized in that, An energy harvesting coil is stacked above the first relay coil and the second relay coil respectively, and the energy harvesting coil obtains electrical energy through strong magnetic field coupling with the corresponding relay coil. The energy harvesting circuit does not have a compensation circuit. The electrical energy is directly supplied to the heat dissipation device after being rectified by a full-bridge rectifier and voltage regulation. The relay energy harvesting circuit is a passive circuit structure without energy storage and wired power supply. The energy harvesting, rectification, voltage regulation and forced air cooling heat dissipation device are integrated on the back of the coil.

7. A control method for a wireless charging system for electric vehicles in a multi-level parking garage, characterized in that, Applied to the system as described in any one of claims 1 to 6, the method comprises the following steps: Measure the rectified output voltage of the relay terminal power extraction circuit. ; Will Compare with a preset threshold; if If the current exceeds the preset threshold, the mobile parking space relay will send an overcurrent / no-load indication to the fixed transmitter of the automated parking garage via the wireless communication module, causing the transmitter to reduce the output voltage or reduce the output power. like If the current is less than or equal to the preset threshold, the transmitter will maintain normal output and charging will be allowed; and the relay circuit current will be monitored and overcurrent protected throughout the process.

8. The control method for the wireless charging system for electric vehicles in a multi-level parking garage according to claim 7, characterized in that, The rectified output voltage of the power harvesting circuit at the measurement relay terminal is measured. ,include: Measure the output voltage of the rectifier circuit of the first energy harvesting circuit. The voltage of the energy harvesting circuit input to the full-bridge rectifier circuit. Relay circuit current , The mutual inductance between the first relay coil and the energy extraction coil is derived through calculation. Relationship with relay coil circuit current: ； By monitoring the rectified output voltage U of the first energy harvesting circuit T This enables the detection of relay coil circuit current and overcurrent protection.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method as described in claim 7 or 8.

10. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method as described in claim 7 or 8.

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