A multi-charging-pile electric vehicle wireless charging system and method

Abstract

The application provides a kind of electric vehicle wireless charging system and method of multiple charging piles, it is related to electric vehicle wireless charging field, including: multiple charging piles, set in charging area;Central controller is connected respectively each charging pile, including: management module, for managing the working state of each charging pile;When vehicle enters charging area, alignment module establishes communication with vehicle and carries out compatibility check, when receiving alignment request initiated by vehicle after compatibility check passes, control each charging pile not in working state and vehicle alignment, when the alignment result fed back by vehicle indicates that alignment is completed, communication with vehicle is disconnected and control alignment successful charging pile and vehicle establish communication;When the charging pile that establishes communication with vehicle receives the charging request initiated by vehicle, according to the charging parameter of vehicle, vehicle is charged, until receiving the stop charging signal fed back by vehicle.The beneficial effect is to solve the problem that the alignment and communication of vehicle and charging pile in traditional wireless charging system are inconsistent.

Description

Technical Field

[0001] This invention relates to the field of wireless charging for electric vehicles, and more particularly to a wireless charging system and method for electric vehicles with multiple charging stations. Background Technology

[0002] Today, wireless charging systems for electric vehicles are relatively mature in one-to-one private charging station applications. Wireless charging typically consists of two parts: a ground-based transmitter and a vehicle-based receiver. The ground and vehicle devices communicate via WiFi, and the vehicle is usually already paired with a corresponding ground-based receiver, ensuring stable communication. However, current technology struggles to expand into public charging station scenarios with multiple vehicles connected to multiple charging stations. The biggest problem lies in the fact that in such scenarios, WiFi pairing and connection are random, as is the vehicle's parking maneuver. It cannot be guaranteed that the ground-based receiver connected to the vehicle's WiFi will be in the exact parking space, thus failing to address this typical problem in public charging station scenarios. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a wireless charging system for electric vehicles with multiple charging piles, comprising:

[0004] Multiple charging stations are located in the charging area;

[0005] The central controller, connected to each of the aforementioned charging piles, includes:

[0006] The management module is used to manage the working status of each of the charging piles;

[0007] The alignment module, connected to the management module, is used to establish communication with the vehicle and perform a compatibility check when the vehicle enters the charging area. After the compatibility check is passed, when the vehicle initiates an alignment request, the module controls each of the charging piles that are not in operation to align with the vehicle. When the vehicle reports an alignment result indicating that alignment is complete, the module disconnects from the vehicle and controls the successfully aligned charging piles to establish communication with the vehicle.

[0008] When the charging pile that has established communication with the vehicle receives a charging request initiated by the vehicle, it charges the vehicle according to the vehicle's charging parameters until the charging pile receives a stop charging signal from the vehicle.

[0009] Preferably, the management module further includes:

[0010] The registration unit is used to generate a corresponding ID based on the request message associated with the registration request and send it back to the charging pile when a new charging pile connects to the central controller and a registration request for the charging pile is received.

[0011] Preferably, the alignment module includes:

[0012] A storage unit is used to store the charging pile parameters of each of the charging piles;

[0013] The inspection unit, connected to the storage unit, is used to establish communication with the vehicle when the vehicle enters the charging area. Subsequently, upon receiving a compatibility check request and associated vehicle equipment parameters from the vehicle, the inspection unit matches the parameters of each charging pile with the vehicle equipment parameters, and uses the matching result as the compatibility check result and feeds it back to the vehicle.

[0014] The alignment unit, connected to the inspection unit, is used to control each of the charging piles that are not in operation to align with the vehicle when the compatibility result indicates that the compatibility is passed and the alignment request initiated by the vehicle is received; and to disconnect communication with the vehicle and control the charging piles that have successfully aligned to establish communication with the vehicle when the alignment result fed back by the vehicle indicates that the alignment is completed.

[0015] Preferably, if the charging pile includes a charging coil and the vehicle includes an on-board coil, then the alignment unit includes:

[0016] The starting subunit is configured to, when the compatibility result indicates that compatibility has passed and the alignment request initiated by the vehicle is received, control the charging coils of each charging pile that is not in operation to be energized to generate a magnetic field of a preset magnetic field frequency. The vehicle feeds back the magnetic field frequency sensed by the vehicle-mounted coil to the central controller. The central controller determines the charging pile corresponding to the vehicle based on the received magnetic field frequency and the preset magnetic field frequency. Subsequently, the vehicle processes the induced current generated by the vehicle-mounted coil to obtain the coupling coefficient between the charging coil and the vehicle-mounted coil. When the coupling coefficient is greater than a preset threshold, the vehicle feeds back the alignment result indicating that alignment is complete.

[0017] The end subunit, connected to the start subunit, is used to control the charging coils of each charging pile to stop being powered when the alignment result indicating that alignment is complete is received, and then disconnects communication with the vehicle and controls the charging pile that has successfully aligned to establish communication with the vehicle.

[0018] Preferably, the charging pile includes a charging coil, a communication controller, and a power controller, wherein the communication controller is connected to the power controller, and the power controller is connected to the charging coil; then the communication controller includes:

[0019] The starting unit is used to acquire the charging parameters of the vehicle, and then control the power controller to energize the charging coil to generate a charging current to start charging according to the charging parameters, and adjust the charging current according to the charging status fed back by the vehicle.

[0020] The shut-off unit, connected to the start-up unit, is used to control the power controller to de-energize the charging coil and stop charging when the stop signal sent by the vehicle is received.

[0021] Preferably, the charging pile includes a charging coil, and the charging coil includes:

[0022] A charging power supply, wherein the positive terminal of the charging power supply is connected to the drain of the first field-effect transistor and the drain of the second field-effect transistor, and the negative terminal of the charging power supply is connected to the source of the third field-effect transistor and the source of the fourth field-effect transistor.

[0023] A first inductor, one end of which is connected to the source of the first field-effect transistor and the drain of the third field-effect transistor, the other end of which is connected to one end of a first capacitor and one end of a second capacitor, and the other end of the second capacitor is connected to the source of the second field-effect transistor and the drain of the fourth field-effect transistor.

[0024] A second inductor, one end of which is connected to the other end of the first capacitor, the other end of which is connected to one end of the first resistor, and the other end of the first resistor is connected to the other end of the second capacitor.

[0025] Preferably, the vehicle includes an on-board coil, the on-board coil comprising:

[0026] A third inductor, one end of which is connected to one end of a third capacitor, the other end of which is connected to one end of a second resistor, the other end of which is connected to one end of a fourth capacitor and one end of a fourth inductor, and the other end of which is connected to the other end of the second resistor;

[0027] The first diode, the anode of which is connected to the drain of the fifth field-effect transistor, is connected to the other end of the fourth inductor, and the cathode of which is connected to the cathode of the second diode.

[0028] The vehicle battery has its positive terminal connected to the cathode of the first diode, the cathode of the vehicle battery connected to the source of the fifth field-effect transistor and the source of the sixth field-effect transistor, and the drain of the sixth field-effect transistor connected to the other end of the second resistor.

[0029] This invention also provides a wireless charging method for electric vehicles with multiple charging piles, applied to the aforementioned wireless charging system for electric vehicles, the method comprising:

[0030] Step S1: When the electric vehicle wireless charging system enters the charging area, it establishes communication with the vehicle and performs a compatibility check. After the compatibility check is passed, when it receives a positioning request initiated by the vehicle, it controls each of the charging piles that are not in operation to position with the vehicle. When the positioning result fed back by the vehicle indicates that the positioning is completed, it disconnects from the vehicle and controls the successfully positioned charging pile to establish communication with the vehicle.

[0031] In step S2, when the electric vehicle wireless charging system receives a charging request initiated by the vehicle, it charges the vehicle according to the vehicle's charging parameters until the charging pile receives a stop charging signal from the vehicle.

[0032] Preferably, step S1 includes:

[0033] Step S11: When the vehicle enters the charging area, the electric vehicle wireless charging system controls the central controller to establish communication with the vehicle. Then, when it receives the compatibility check request and associated vehicle equipment parameters issued by the vehicle, it matches the parameters of each charging pile with the vehicle equipment parameters, and uses the matching result as the check result and feeds it back to the vehicle.

[0034] In step S12, when the compatibility result indicates that the compatibility check has passed and the alignment request initiated by the vehicle is received, the electric vehicle wireless charging system controls each of the charging piles that is not in operation to align with the vehicle. When the alignment result fed back by the vehicle indicates that the alignment is completed, the system controls the central controller to disconnect from the vehicle and controls the charging pile that has successfully aligned to establish communication with the vehicle.

[0035] Preferably, the charging pile includes a charging coil, and the vehicle includes an on-board coil; then step S12 includes:

[0036] In step S121, when the compatibility result indicates that the compatibility is passed and the alignment request initiated by the vehicle is received, the electric vehicle wireless charging system controls the charging coils of each charging pile that is not in operation to be energized to generate a magnetic field with a preset magnetic field frequency. The vehicle feeds back the magnetic field frequency sensed by the vehicle-mounted coil to the central controller. The central controller determines the charging pile corresponding to the vehicle based on the received magnetic field frequency and the preset magnetic field frequency. Subsequently, the vehicle processes the induced current generated by the vehicle-mounted coil to obtain the coupling coefficient between the charging coil and the vehicle-mounted coil. When the coupling coefficient is greater than a preset threshold, the vehicle feeds back the alignment result indicating that the alignment is completed.

[0037] In step S122, when the electric vehicle wireless charging system receives the alignment result indicating that the alignment is complete, it controls the charging coil of each charging pile to stop being powered on, and then controls the central controller to disconnect from the vehicle and controls the successfully aligned charging pile to establish communication with the vehicle.

[0038] The above technical solution has the following advantages or beneficial effects: After the vehicle enters the parking area, it wirelessly communicates with the central controller to determine whether the vehicle is compatible with each charging pile. If compatible, it performs alignment. During alignment, the charging coils of each charging pile are energized to generate magnetic fields of different frequencies. The vehicle's on-board coil generates an induced current under the influence of the magnetic field and determines whether alignment is complete. After alignment is completed, it wirelessly connects and communicates with the aligned charging pile. Subsequently, after the vehicle issues a charging request, it controls the corresponding charging pile to start charging. The alignment step solves the problem that traditional wireless charging systems cannot guarantee that the charging pile connected to the vehicle is exactly the parking space where the vehicle is parked. This enables multiple charging piles to charge multiple vehicles in a wireless charging system in public application scenarios. Attached Figure Description

[0039] Figure 1 A schematic diagram of the structure of a wireless charging system for electric vehicles with multiple charging piles is shown in a preferred embodiment of the present invention.

[0040] Figure 2 A schematic diagram of the overall operation of the electric vehicle wireless charging system during vehicle charging, as described in a preferred embodiment of the present invention.

[0041] Figure 3 A circuit diagram of the charging coil and the vehicle-mounted coil is shown in a preferred embodiment of the present invention.

[0042] Figure 4 A flowchart illustrating a preferred embodiment of the present invention is shown below;

[0043] Figure 5 This is a schematic diagram of a sub-process of step S1 in a preferred embodiment of the present invention.

[0044] Figure 6 This is a schematic diagram of the sub-process of step S12 in a preferred embodiment of the present invention. Detailed Implementation

[0045] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within the scope of the present invention.

[0046] In a preferred embodiment of the present invention, based on the aforementioned problems existing in the prior art, a wireless charging system for electric vehicles with multiple charging piles is provided, such as... Figure 1 As shown, it includes:

[0047] Multiple charging piles are installed in the charging area;

[0048] Central controller 2, connected to each charging pile 1, includes:

[0049] Management module 21 is used to manage the working status of each charging pile;

[0050] The alignment module 22 and the connection management module 21 are used to establish communication with the vehicle and perform compatibility checks when the vehicle 3 enters the charging area. After the compatibility check is passed, when the vehicle 3 initiates an alignment request, the module controls each charging pile 1 that is not in operation to align with the vehicle 3. When the vehicle 3 sends an alignment result indicating that the alignment is completed, the module disconnects from the vehicle 3 and controls the successfully aligned charging pile 1 to establish communication with the vehicle 3.

[0051] When the charging pile 1, which has established communication with vehicle 3, receives a charging request initiated by vehicle 3, it charges vehicle 3 according to the charging parameters of vehicle 3 until the charging pile 1 receives a stop charging signal from the vehicle.

[0052] In a preferred embodiment of the present invention, the management module 21 further includes:

[0053] The registration unit 211 is used to generate a corresponding ID based on the request message associated with the registration request and send it back to the charging pile 1 when the new charging pile 1 is connected to the central controller 2 and a registration request for the charging pile 1 is received.

[0054] Specifically, in this embodiment, when adding a new charging pile 1 to the system, it needs to be registered in the central controller 2 first. The charging pile 1 includes a communication controller 11. The registration process is as follows:

[0055] Step 1: The communication controller 11 sends a registration request with a specified message to the central controller 2;

[0056] Step 2: The central controller 2 sends the request result of the specified message back to the communication controller 11;

[0057] Step 3: After generating an ID according to the pre-configured rules, the communication controller 11 sends a registration ID request to the central controller 2 via a specified message.

[0058] Step 4: The central controller 2 sends the ID registration result back to the communication controller 11 via a specified message to complete the registration of the charging pile 1.

[0059] In a preferred embodiment of the present invention, such as Figure 1 As shown, the alignment module 22 includes:

[0060] Storage unit 221 is used to store the charging pile parameters of each charging pile 1;

[0061] The inspection unit 222 is connected to the storage unit 221 and is used to establish communication with the vehicle 3 when the vehicle 3 enters the charging area. Then, when it receives the compatibility inspection request and associated vehicle equipment parameters issued by the vehicle 3, it matches the parameters of each charging pile with the vehicle equipment parameters, and uses the matching result as the inspection result and feeds it back to the vehicle 3.

[0062] Alignment unit 223 and connection checking unit 222 are used to control each charging pile 1 that is not in operation to align with vehicle 3 when the compatibility result indicates that the compatibility is passed and an alignment request initiated by vehicle 3 is received. When the alignment result fed back by vehicle 3 indicates that the alignment is completed, communication with vehicle 3 is disconnected and communication is established between the successfully aligned charging pile 1 and vehicle 3.

[0063] Specifically, in this embodiment, when vehicle 3 and central controller 2 establish a communication link, a compatibility check is performed. Central controller 2 and vehicle 3 exchange necessary information about charging pile 1 and vehicle 3 to determine compatibility. This information includes the power rating of the charging pile 1 and vehicle 3, the type of resonant compensation circuit, the type of equipment coil, the equipment ground clearance rating, the maximum values ​​of the output voltage and current of the on-board equipment, the maximum and minimum current values ​​of the charging coil of charging pile 1, the self-inductance of the charging coil 12 of charging pile 1, and the compatibility result identifier of the charging coil 12. The compatibility check is initiated by vehicle 3, the central controller 2 responds to the compatibility check, and the central controller 2 sends the compatibility check result back to vehicle 3.

[0064] In a preferred embodiment of the present invention, the charging pile 1 includes a charging coil 12, and the vehicle 3 includes an on-board coil 31, then as follows Figure 1 As shown, the alignment unit 223 includes:

[0065] The starting subunit 2231 is used to control the charging coils 12 of each charging pile 1 that is not in operation to generate a magnetic field of a preset magnetic field frequency when the compatibility result indicates that the compatibility is passed and the alignment request initiated by the vehicle 3 is received. The vehicle 3 feeds back the magnetic field frequency sensed by the vehicle coil 31 to the central controller 2. The central controller 2 determines the charging pile 1 corresponding to the vehicle 3 based on the received magnetic field frequency and the preset magnetic field frequency. Then, the vehicle 3 processes the induced current generated by the vehicle coil 31 to obtain the coupling coefficient between the charging coil 12 and the vehicle coil 31. When the coupling coefficient is greater than a preset threshold, the vehicle 3 feeds back the alignment result indicating that the alignment is completed.

[0066] The end subunit 2232 is connected to the start subunit 2231. When the alignment result indicating that the alignment is completed is received, the charging coil 12 of each charging pile 1 is stopped from being powered on. Then the communication with the vehicle 3 is disconnected and the successfully aligned charging pile 1 is controlled to establish communication with the vehicle 3.

[0067] Specifically, in this embodiment, the electric vehicle wireless charging system uses a low-power excitation method to determine the position alignment. Specifically, the charging pile 1 excites a fixed-size charging coil current to generate a fixed high-frequency magnetic field. When the vehicle 3 reaches the alignment position, the vehicle's onboard coil 31 can sense this magnetic field. The onboard power controller 32 on the vehicle 3, connected to the onboard coil 31, can identify this magnetic field and determine its strength by sensing the current, thereby determining the coupling coefficient between the charging pile 1 and the vehicle 3 at their current positions, and thus determining whether the alignment condition has been met.

[0068] During the vehicle alignment phase, alignment information is also exchanged with the central controller 1. This information includes the request status of low-power excitation, the detected value of the vehicle-side induced current frequency, the reference current request value of the charging coil, the matching status of the charging pile and vehicle detection frequencies, and the actual current value of the charging coil.

[0069] In a preferred embodiment of the present invention, the charging pile 1 includes a charging coil 12, a communication controller 11, and a power controller 13. The communication controller 11 is connected to the power controller 13, and the power controller 13 is connected to the charging coil 12. Figure 1 As shown, the communication controller 11 includes:

[0070] The starting unit 111 is used to acquire the charging parameters of the vehicle 3, and then control the power controller 13 to energize the charging coil 12 to generate a charging current to start charging according to the charging parameters, and adjust the charging current according to the charging status fed back by the vehicle.

[0071] The shut-off unit 112 is connected to the start-up unit 111 and is used to control the power controller 13 to cut off the power to the charging coil 12 and stop charging when a stop signal is received from the vehicle 3.

[0072] Specifically, in this embodiment, the charging area is equipped with a central controller 2 and multiple charging piles 1. The central controller 2 is connected to all the charging piles 1 via a CAN bus, such as... Figure 2 As shown;

[0073] When vehicle 3 enters the charging area, it first establishes a communication link with central controller 2 via WIFI. Then, central controller 2 and vehicle 3 exchange information, mainly including the power levels of charging pile 1 and vehicle 3, the type of resonant compensation circuit, the type of equipment coil, the equipment ground clearance level, the maximum values ​​of the on-board equipment output voltage and current, the maximum and minimum current values ​​of the ground equipment coil, and the self-inductance of charging coil 12. When vehicle 3 initiates a compatibility check request, it uses this information to determine whether charging pile 1 and vehicle 3 are compatible. If compatibility is determined, vehicle 3 initiates an alignment request to begin alignment. At this time, central controller 2 controls each inactive charging pile 1 to energize its respective charging coil 12 to generate a magnetic field, causing the vehicle to... When the on-board coil 31 on vehicle 3 generates an induced current and a magnetic field, the current flowing through each charging coil 12 will be different, which is used to distinguish which charging pile 1 and vehicle 3 have completed alignment. When vehicle 3 and one of the charging piles 1 have completed alignment, the central controller 2 disconnects from the communication with vehicle 3, and the aligned charging pile 1 and vehicle 3 establish communication. The charging pile 1 begins to exchange charging needs, charging parameters and charging status information with vehicle 3 in real time. The charging current is dynamically adjusted according to the charging status to ensure the stability and reliability of the entire wireless charging stage. The exchanged charging parameters include the charging coil current command value, the maximum and minimum allowable current values ​​of the charging coil, the actual value of the charging coil current, and the maximum output power value supported by the device in real time.

[0074] During the charging process, vehicle 3 will issue a stop charging command based on the user's active stopping of charging, the battery being fully charged, or the vehicle being in motion. When charging pile 1 receives the stop charging command, it will stop charging the vehicle. When the vehicle is still within the communication range of the central node, vehicle 3 will re-establish a communication connection with the central controller 2 to ensure the next possible charging action.

[0075] The above operation solves the problem in traditional wireless charging systems where WiFi communication pairing and connection are random when multiple vehicles are connected to multiple charging piles, and the vehicle's parking action is also random, making it impossible to guarantee that the charging pile connected to the vehicle's WiFi communication is exactly the charging pile in the parking space where the vehicle is parked.

[0076] In a preferred embodiment of the present invention, the charging pile includes a charging coil 12, such as... Figure 3 As shown, the charging coil 12 includes:

[0077] The charging power supply DC is connected to the drain of the first field-effect transistor Q1 and the drain of the second field-effect transistor Q2, and the negative terminal of the charging power supply DC is connected to the source of the third field-effect transistor Q3 and the source of the fourth field-effect transistor Q4.

[0078] The first inductor L1 has one end connected to the source of the first field-effect transistor Q1 and the drain of the third field-effect transistor Q3. The other end of the first inductor L1 is connected to one end of the first capacitor C1 and one end of the second capacitor C2. The other end of the second capacitor C2 is connected to the source of the second field-effect transistor Q2 and the drain of the fourth field-effect transistor Q4.

[0079] The second inductor L2 has one end connected to the other end of the first capacitor C1, and the other end of the second inductor L2 is connected to one end of the first resistor R1. The other end of the first resistor R1 is connected to the other end of the second capacitor C2.

[0080] In a preferred embodiment of the present invention, vehicle 3 includes an on-board coil 31, such as... Figure 3 As shown, the vehicle-mounted coil 31 includes:

[0081] The third inductor L3, one end of the third inductor L3 is connected to one end of the third capacitor C3, the other end of the third inductor L3 is connected to one end of the second resistor R2, the other end of the third capacitor C3 is connected to one end of the fourth capacitor C4 and one end of the fourth inductor L4, and the other end of the fourth capacitor C4 is connected to the other end of the second resistor R2.

[0082] The anode of the first diode D1 and the drain of the fifth field-effect transistor Q5 are connected to the other end of the fourth inductor L4, and the cathode of the first diode D1 is connected to the cathode of the second diode D2.

[0083] The positive terminal of the vehicle battery BT is connected to the cathode of the first diode D1, and the cathode of the vehicle battery BT is connected to the source of the fifth field-effect transistor Q5 and the source of the sixth field-effect transistor Q6. The drain of the sixth field-effect transistor Q6 is connected to the other end of the second resistor R2.

[0084] This invention also provides a wireless charging method for electric vehicles with multiple charging piles, applicable to the aforementioned wireless charging system for electric vehicles, such as... Figure 4 As shown, the wireless charging method for electric vehicles includes:

[0085] Step S1: When the electric vehicle wireless charging system enters the charging area, it establishes communication with the vehicle and performs a compatibility check. After the compatibility check is passed, when it receives a positioning request initiated by the vehicle, it controls each charging pile that is not in operation to position with the vehicle. When the positioning result fed back by the vehicle indicates that the positioning is completed, it disconnects from the vehicle and controls the successfully positioned charging pile to establish communication with the vehicle.

[0086] In step S2, when the electric vehicle wireless charging system receives a charging request initiated by the vehicle, it charges the vehicle according to the vehicle's charging parameters until the charging pile receives a stop charging signal.

[0087] In a preferred embodiment of the present invention, such as Figure 5 As shown, step S1 includes:

[0088] Step S11: When the electric vehicle wireless charging system enters the charging area, the central controller establishes communication with the vehicle. Then, when it receives the compatibility check request and associated vehicle equipment parameters from the vehicle, it matches the parameters of each charging pile with the vehicle equipment parameters, and uses the matching result as the check result and feeds it back to the vehicle.

[0089] In step S12, when the compatibility result indicates that the compatibility check has passed and the vehicle initiates a positioning request, the electric vehicle wireless charging system controls each charging pile that is not in operation to position itself with the vehicle. When the positioning result returned by the vehicle indicates that the positioning is complete, the system controls the central controller to disconnect from the vehicle and controls the successfully positioned charging pile to establish communication with the vehicle.

[0090] In a preferred embodiment of the present invention, the charging pile includes a charging coil, and the vehicle includes an on-board coil, then as follows: Figure 6 As shown, step S12 includes:

[0091] In step S121, when the compatibility result indicates that the compatibility is passed and the vehicle initiates a positioning request, the wireless charging system controls the charging coils of each charging pile that is not in operation to be energized to generate a magnetic field with a preset magnetic field frequency. The vehicle feeds back the magnetic field frequency sensed by the on-board coil to the central controller. The central controller determines the charging pile corresponding to the vehicle based on the received magnetic field frequency and the preset magnetic field frequency.

[0092] In step S122, the vehicle processes the induced current generated by the vehicle coil to obtain the coupling coefficient between the charging coil and the vehicle coil. When the coupling coefficient is greater than a preset threshold, the vehicle feeds back the alignment result indicating that the alignment is complete.

[0093] In step S123, when the electric vehicle wireless charging system receives a alignment result indicating that alignment is complete, it controls the charging coils of each charging pile to stop being powered on. Then, it controls the central controller to disconnect from the vehicle and controls the successfully aligned charging pile to establish communication with the vehicle.

[0094] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present invention.

Claims

1. A wireless charging system for electric vehicles with multiple charging piles, characterized in that, include: Multiple charging stations are located in the charging area; The central controller, connected to each of the aforementioned charging piles, includes: The management module is used to manage the working status of each of the charging piles; The alignment module, connected to the management module, is used to establish communication with the vehicle and perform a compatibility check when the vehicle enters the charging area. After the compatibility check is passed, when the vehicle initiates an alignment request, the module controls each of the charging piles that are not in operation to align with the vehicle. When the vehicle reports an alignment result indicating that alignment is complete, the module disconnects from the vehicle and controls the successfully aligned charging piles to establish communication with the vehicle. When the charging pile that has established communication with the vehicle receives a charging request initiated by the vehicle, it charges the vehicle according to the vehicle's charging parameters until the charging pile receives a stop charging signal from the vehicle. The charging pile includes a charging coil, the vehicle includes an on-board coil, and the alignment module includes an alignment unit, the alignment unit including: The starting subunit is used to control the charging coils of each charging pile that is not in operation to generate a magnetic field of a preset magnetic field frequency when the compatibility result indicates that the compatibility is passed and the alignment request initiated by the vehicle is received. The vehicle feeds back the magnetic field frequency sensed by the vehicle coil to the central controller. The central controller determines the charging pile corresponding to the vehicle based on the received magnetic field frequency and the preset magnetic field frequency. Subsequently, the vehicle processes the induced current generated by the vehicle coil to obtain the coupling coefficient between the charging coil and the vehicle coil. When the coupling coefficient is greater than a preset threshold, the vehicle feeds back the alignment result indicating that the alignment is completed. The end subunit, connected to the start subunit, is used to control the charging coils of each charging pile to stop being powered when the alignment result indicating that alignment is complete is received, and then disconnects communication with the vehicle and controls the charging pile that has successfully aligned to establish communication with the vehicle.

2. The wireless charging system for electric vehicles according to claim 1, characterized in that, The management module also includes: The registration unit is used to generate a corresponding ID based on the request message associated with the registration request and send it back to the charging pile when a new charging pile connects to the central controller and a registration request for the charging pile is received.

3. The wireless charging system for electric vehicles according to claim 1, characterized in that, The alignment module includes: A storage unit is used to store the charging pile parameters of each of the charging piles; The inspection unit, connected to the storage unit, is used to establish communication with the vehicle when the vehicle enters the charging area. Subsequently, upon receiving a compatibility check request and associated vehicle equipment parameters from the vehicle, the inspection unit matches the parameters of each charging pile with the vehicle equipment parameters, and uses the matching result as the compatibility check result and feeds it back to the vehicle. The alignment unit, connected to the inspection unit, is used to control each of the charging piles that are not in operation to align with the vehicle when the compatibility result indicates that the compatibility is passed and the alignment request initiated by the vehicle is received; and to disconnect communication with the vehicle and control the charging piles that have successfully aligned to establish communication with the vehicle when the alignment result fed back by the vehicle indicates that the alignment is completed.

4. The wireless charging system for electric vehicles according to claim 1, characterized in that, The charging pile includes a charging coil, a communication controller, and a power controller. The communication controller is connected to the power controller, and the power controller is connected to the charging coil. The communication controller includes: The starting unit is used to acquire the charging parameters of the vehicle, and then control the power controller to energize the charging coil to generate a charging current to start charging according to the charging parameters, and adjust the charging current according to the charging status fed back by the vehicle. The shut-off unit, connected to the start-up unit, is used to control the power controller to de-energize the charging coil and stop charging when the stop-charging signal sent by the vehicle is received.

5. The wireless charging system for electric vehicles according to claim 1, characterized in that, The charging pile includes a charging coil, and the charging coil includes: A charging power supply, wherein the positive terminal of the charging power supply is connected to the drain of the first field-effect transistor and the drain of the second field-effect transistor, and the negative terminal of the charging power supply is connected to the source of the third field-effect transistor and the source of the fourth field-effect transistor. A first inductor, one end of which is connected to the source of the first field-effect transistor and the drain of the third field-effect transistor, the other end of which is connected to one end of a first capacitor and one end of a second capacitor, and the other end of the second capacitor is connected to the source of the second field-effect transistor and the drain of the fourth field-effect transistor. A second inductor, one end of which is connected to the other end of the first capacitor, the other end of which is connected to one end of the first resistor, and the other end of the first resistor is connected to the other end of the second capacitor.

6. The wireless charging system for electric vehicles according to claim 1, characterized in that, The vehicle includes an on-board coil, the on-board coil comprising: A third inductor, one end of which is connected to one end of a third capacitor, the other end of which is connected to one end of a second resistor, the other end of which is connected to one end of a fourth capacitor and one end of a fourth inductor, and the other end of which is connected to the other end of the second resistor; The first diode, the anode of which is connected to the drain of the fifth field-effect transistor, is connected to the other end of the fourth inductor, and the cathode of which is connected to the cathode of the second diode. The vehicle battery has its positive terminal connected to the cathode of the first diode, its cathode connected to the source of the fifth field-effect transistor and the source of the sixth field-effect transistor, and its drain connected to the other end of the second resistor.

7. A wireless charging method for electric vehicles with multiple charging stations, characterized in that, The electric vehicle wireless charging method, applied to any one of claims 1-6, comprises: Step S1: When the electric vehicle wireless charging system enters the charging area, it establishes communication with the vehicle and performs a compatibility check. After the compatibility check is passed, when it receives a positioning request initiated by the vehicle, it controls each of the charging piles that are not in operation to position with the vehicle. When the positioning result fed back by the vehicle indicates that the positioning is completed, it disconnects from the vehicle and controls the successfully positioned charging pile to establish communication with the vehicle. In step S2, when the electric vehicle wireless charging system receives a charging request initiated by the vehicle, it charges the vehicle according to the vehicle's charging parameters until the charging pile receives a stop charging signal from the vehicle.

8. The wireless charging method for electric vehicles according to claim 7, characterized in that, Step S1 includes: Step S11: When the vehicle enters the charging area, the electric vehicle wireless charging system controls the central controller to establish communication with the vehicle. Then, when it receives the compatibility check request and associated vehicle equipment parameters from the vehicle, it matches the parameters of each charging pile with the vehicle equipment parameters, and uses the matching result as the compatibility result and feeds it back to the vehicle. In step S12, when the compatibility result indicates that the compatibility check has passed and the alignment request initiated by the vehicle is received, the electric vehicle wireless charging system controls each of the charging piles that is not in operation to align with the vehicle. When the alignment result fed back by the vehicle indicates that the alignment is completed, the system controls the central controller to disconnect from the vehicle and controls the charging pile that has successfully aligned to establish communication with the vehicle.

9. The wireless charging method for electric vehicles according to claim 8, characterized in that, The charging pile includes a charging coil, and the vehicle includes an on-board coil. Therefore, step S12 includes: In step S121, when the compatibility result indicates that the compatibility is passed and the alignment request initiated by the vehicle is received, the electric vehicle wireless charging system controls the charging coils of each charging pile that is not in operation to be energized to generate a magnetic field with a preset magnetic field frequency. The vehicle feeds back the magnetic field frequency sensed by the vehicle-mounted coil to the central controller. The central controller determines the charging pile corresponding to the vehicle based on the received magnetic field frequency and the preset magnetic field frequency. Subsequently, the vehicle processes the induced current generated by the vehicle-mounted coil to obtain the coupling coefficient between the charging coil and the vehicle-mounted coil. When the coupling coefficient is greater than a preset threshold, the vehicle feeds back the alignment result indicating that the alignment is completed. In step S122, when the electric vehicle wireless charging system receives the alignment result indicating that the alignment is complete, it controls the charging coil of each charging pile to stop being powered on, and then controls the central controller to disconnect from the vehicle and controls the successfully aligned charging pile to establish communication with the vehicle.

Images