Charging control method, device and system of alternating current charging pile and controller

Abstract

The invention provides a charging control method, device and system of an alternating current charging pile and a controller, and relates to the technical field of alternating current charging piles. The method comprises the following steps: acquiring a voltage value change state of a preset detection point between a charging protocol controller and a vehicle controller; determining a target charging state of the charging gun and the electric vehicle according to the voltage value change state; according to the target charging state, the on-off state of a first alternating current contactor of a charging cable of the charging gun is controlled, and charging indication information is sent to an equipment controller, so that the equipment controller controls the on-off state of a second alternating current contactor of the charging cable of the alternating current charging pile; according to the target charging state, controlling the switching state of a driving signal change-over switch; and a driving control signal is sent to the vehicle controller through the driving signal change-over switch, and the alternating current charging pile is controlled to be charged with the electric vehicle through the charging gun. Multiple charging guns can be led out from one alternating current charging pile, and the construction cost of the alternating current charging pile is reduced.

Description

Technical Field

[0001] This application relates to the field of AC charging pile technology, and more specifically, to a charging control method, device, system and controller for an AC charging pile. Background Technology

[0002] Existing electric vehicle charging systems typically include an AC charging station and a charging gun. The AC charging station is connected to the charging gun via a charging cable, and the charging gun's charging plug is plugged into the electric vehicle's charging socket for charging.

[0003] Currently, most AC charging piles on the market are household-type, one pile per vehicle. However, under the background of "unified construction and unified service", AC charging piles will also move towards centralized operation in the future. Operators are very sensitive to the construction cost of AC charging piles. The construction cost of the "one pile per vehicle" deployment method is very high, which is not conducive to the development of the industry. Summary of the Invention

[0004] The purpose of this application is to address the shortcomings of the prior art by providing a charging control method, device, system, and controller for AC charging piles, so as to enable one AC charging pile to lead out multiple charging guns and reduce the construction cost of AC charging piles.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows: In a first aspect, embodiments of this application provide a charging control method for an AC charging pile, applied to a charging protocol controller in a charging gun. The charging protocol controller is connected to a vehicle controller in an electric vehicle via a drive signal switching switch, and is also communicatively connected to a device controller in the AC charging pile. The method includes: Acquire the voltage change status of a preset detection point between the charging protocol controller and the vehicle controller; Based on the voltage value change, the target charging state between the charging gun and the electric vehicle is determined; According to the target charging state, the on / off state of the first AC contactor on the charging cable in the charging gun is controlled, and charging instruction information is sent to the device controller, so that the device controller controls the on / off state of the second AC contactor on the charging cable in the AC charging pile; The switching state of the drive signal switching switch is controlled according to the target charging state. The drive signal switching switch sends a drive control signal to the vehicle controller to control the AC charging pile to charge the electric vehicle through the charging gun.

[0006] Optionally, if the target charging state is that the charging gun is connected, the charging indication information is charging connection information; the step of controlling the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state and sending the charging indication information to the device controller includes: Based on the charging gun's connected status, the first AC contactor is controlled to be in a disconnected state, and the charging connection information is sent to the device controller, causing the device controller to control the second AC contactor to be in a disconnected state. The step of controlling the switching state of the drive signal switching switch according to the target charging state includes: Based on the charging gun's connected status, control the drive signal switching switch to switch to the drive signal output state; Sending drive control signals to the vehicle controller via the drive signal switching switch includes: Receive the maximum charging current parameter sent by the device controller based on the charging connection information; A first drive control signal is generated based on the maximum charging current parameter and sent to the vehicle controller, so that the vehicle controller controls the electric vehicle to enter the charging ready state.

[0007] Optionally, if the target charging state is a charging ready state, the charging indication information is a charging confirmation information; the step of controlling the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state and sending the charging indication information to the device controller includes: Based on the charging ready state, the first AC contactor is controlled to be in the conducting state, and the charging confirmation information is sent to the device controller, so that the device controller controls the second AC contactor to be in the conducting state. The step of controlling the switching state of the drive signal switching switch according to the target charging state includes: Based on the charging ready state, control the drive signal switching switch to switch to the drive signal output state; Sending drive control signals to the vehicle controller via the drive signal switching switch includes: The device receives a target charging current parameter sent by the device controller based on the charging confirmation information. The target charging current parameter is determined by the device controller based on the grid capacity and the multiple charging guns connected to the AC charging pile. A second drive control signal is generated based on the target charging current parameter and sent to the vehicle controller, so that the vehicle controller determines the maximum allowable input current based on the second drive control signal.

[0008] Optionally, if the target charging state is a vehicle-side stopped charging state, and the charging indication information is stopped charging information, the step of controlling the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state and sending the charging indication information to the device controller includes: Based on the vehicle-side charging stop status, the first AC contactor is controlled to be in the open state, and the charging stop information is sent to the device controller, so that the device controller controls the second AC contactor to be in the open state; The step of controlling the switching state of the drive signal switching switch according to the target charging state includes: Based on the vehicle-side charging stop status, control the drive signal switching switch to switch to the steady-state voltage output state.

[0009] Optionally, the method further includes: Based on the end-of-charge request sent by the device controller, the drive signal switching switch is controlled to switch to the steady-state voltage output state; The step of controlling the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state, and sending charging instruction information to the device controller, includes: Based on the vehicle-side charging stop state corresponding to the voltage value change state, the first AC contactor is controlled to be in the open state, and a charging stop information is sent to the equipment controller, causing the equipment controller to control the second AC contactor to be in the open state.

[0010] Optionally, if the target charging state is that the charging gun is unplugged, the method further includes: Send a charging gun removal instruction to the device controller so that the AC charging pile enters standby mode.

[0011] Optionally, the method further includes: If a charging emergency stop signal is received, the first AC contactor is controlled to disconnect, and a stop charging information is sent to the device controller, causing the device controller to control the second AC contactor to be in the disconnected state. Control the drive signal switching switch to switch to steady-state voltage output state.

[0012] Secondly, embodiments of this application also provide a charging control device for an AC charging pile, which is applied to a charging protocol controller in a charging gun. The charging protocol controller is connected to a vehicle controller in an electric vehicle via a drive signal switching switch, and the charging protocol controller is also communicatively connected to a device controller in the AC charging pile. The device includes: A voltage change state determination module is used to obtain the voltage value change state of a preset detection point between the charging protocol controller and the vehicle controller; The target charging state determination module is used to determine the target charging state between the charging gun and the electric vehicle based on the voltage value change state. The control module is used to control the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state, and send charging instruction information to the device controller, so that the device controller controls the on / off state of the second AC contactor on the charging cable in the AC charging pile. The control module is also used to control the switching state of the drive signal switching switch according to the target charging state; and to send a drive control signal to the vehicle controller through the drive signal switching switch to control the AC charging pile to charge the electric vehicle through the charging gun.

[0013] Optionally, if the target charging state is a charging gun connected state, the charging indication information is charging connection information; the control module is specifically configured to, based on the charging gun connected state, control the first AC contactor to be in a disconnected state and send the charging connection information to the device controller, so that the device controller controls the second AC contactor to be in a disconnected state; based on the charging gun connected state, control the drive signal switching switch to switch to the drive signal output state; receive the maximum charging current parameter sent by the device controller based on the charging connection information; generate and send a first drive control signal to the vehicle controller based on the maximum charging current parameter, so that the vehicle controller controls the electric vehicle to enter a charging ready state.

[0014] Optionally, if the target charging state is a charging ready state, the charging indication information is a charging confirmation information; the control module is specifically configured to, according to the charging ready state, control the first AC contactor to be in a conducting state and send the charging confirmation information to the device controller, so that the device controller controls the second AC contactor to be in a conducting state; according to the charging ready state, control the drive signal switching switch to switch to a drive signal output state; receive the target charging current parameter sent by the device controller according to the charging confirmation information, the target charging current parameter being determined by the device controller based on the grid capacity and the multiple charging guns connected to the AC charging pile; generate and send a second drive control signal to the vehicle controller according to the target charging current parameter, so that the vehicle controller determines the maximum allowable input current according to the second drive control signal.

[0015] Optionally, if the target charging state is a vehicle-side stopped charging state, and the charging indication information is stopped charging information, the control module is specifically used to control the first AC contactor to be in an open state according to the vehicle-side stopped charging state, and send the stopped charging information to the device controller, so that the device controller controls the second AC contactor to be in an open state; and to control the drive signal switching switch to a steady-state voltage output state according to the vehicle-side stopped charging state.

[0016] Optionally, the control module is further configured to control the drive signal switching switch to switch to a steady-state voltage output state according to the charging termination request sent by the device controller; and to control the first AC contactor to be in an open state according to the vehicle-side charging stop state corresponding to the voltage value change state, and to send a charging stop information to the device controller, so that the device controller controls the second AC contactor to be in an open state.

[0017] Optionally, if the target charging state is that the charging gun has been unplugged, the control module is further configured to send a charging gun unplugging instruction to the device controller so that the AC charging pile enters standby mode.

[0018] Optionally, the control module is further configured to, upon receiving a charging emergency stop signal, control the first AC contactor to disconnect and send a stop charging message to the device controller, thereby causing the device controller to control the second AC contactor to be in the disconnected state; and control the drive signal switching switch to switch to the steady-state voltage output state.

[0019] Thirdly, this application also provides an AC charging system, which includes: an AC charging pile, multiple charging guns, and multiple electric vehicles; The AC charging piles are connected to the multiple charging guns via multiple charging cables, and the charging plug of each charging gun is connected to the charging socket of each electric vehicle. The device controller in the AC charging pile is communicatively connected to the charging protocol controller in each charging gun. The charging protocol controller in each charging gun is connected to the control terminal of the first AC contactor on the charging cable in each charging gun. The charging protocol controller in each charging gun is connected to the vehicle controller in each electric vehicle through the drive signal switching switch in each charging gun. The device controller is connected to the control terminal of the second AC contactor on multiple charging cables in the AC charging pile; The charging protocol controller is used to execute the charging control method for the AC charging pile as described in any of the first aspects.

[0020] Fourthly, embodiments of this application also provide a charging protocol controller, including: a processor, a storage medium, and a bus. The storage medium stores program instructions executable by the processor. When the charging protocol controller is running, the processor communicates with the storage medium via the bus, and the processor executes the program instructions to perform the steps of the charging control method for an AC charging pile as described in any of the first aspects.

[0021] Fifthly, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the charging control method for an AC charging pile as described in any of the first aspects.

[0022] The beneficial effects of this application are: The AC charging pile charging control method, device, system, and controller provided in this application determine the target charging state based on the voltage value change status of a preset detection point. The on / off state of the AC contactor and the switching state of the drive signal switching switch are then controlled according to the target charging state. This enables the AC charging pile to charge electric vehicles via charging guns. The charging protocol controller installed in the charging gun interacts with the device controller in the AC charging pile. This allows one AC charging pile to connect to multiple electric vehicles via multiple charging cables extending from multiple charging guns. This achieves simultaneous charging of multiple electric vehicles while avoiding the need to build separate AC charging piles for each electric vehicle. The multiple hardware components originally required for multiple AC charging piles can be integrated into one system, effectively reducing the construction cost of AC charging piles. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of an AC charging system provided in an embodiment of this application; Figure 2 A flowchart illustrating the charging control method for an AC charging pile provided in this application embodiment. Figure 1 ; Figure 3 A flowchart illustrating the charging control method for an AC charging pile provided in this application embodiment. Figure 2 ; Figure 4 A flowchart illustrating the charging control method for an AC charging pile provided in this application embodiment. Figure 3 ; Figure 5 A flowchart illustrating the charging control method for an AC charging pile provided in this application embodiment. Figure 4 ; Figure 6 A flowchart illustrating the charging control method for an AC charging pile provided in this application embodiment. Figure 5 ; Figure 7 A schematic diagram of the structure of the charging control device for the AC charging pile provided in the embodiments of this application; Figure 8 This is a schematic diagram of a charging protocol controller provided in an embodiment of this application. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] Furthermore, the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Additionally, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0029] To better understand this solution, the specific implementation of the AC charging system used in this application will be explained below.

[0030] Figure 1 The schematic diagram of the AC charging system provided in the embodiments of this application is as follows: Figure 1As shown, the AC charging system may include: an AC charging pile 10, multiple charging guns 20, and multiple electric vehicles 30. The figure shows one charging gun 20 and one electric vehicle 30 as an example.

[0031] The AC charging pile 10 is connected to multiple charging guns 20 via multiple charging cables, and the charging plug of each charging gun 20 is connected to the charging socket of each electric vehicle 30.

[0032] The device controller 11 in the AC charging pile 10 is communicatively connected to the charging protocol controller 21 in each charging gun 20. The charging protocol controller 21 in each charging gun 20 is connected to the control terminal of the first AC contactor on the charging cable in each charging gun 20. The charging protocol controller 21 in each charging gun 20 is connected to the vehicle controller 31 in each electric vehicle 30 through the drive signal switching switch S1 in each charging gun 20.

[0033] The device controller 11 is connected to the control terminal of the second AC contactor on multiple charging cables in the AC charging pile 10.

[0034] In this embodiment, a charging gun and an electric vehicle are used as examples to illustrate the specific implementation of the AC charging system.

[0035] like Figure 1 As shown, the AC charging pile 10 is connected to a charging gun 20 via a charging cable. A first AC contactor is installed on the portion of the charging cable located in the charging gun 20, and a second AC contactor is installed on the portion of the charging cable located in the AC charging pile 10. By controlling the on / off state of the first and second AC contactors, the safety of the system can be ensured, and safety problems caused by accidental shutdown or misoperation of the AC contactors can be avoided.

[0036] In order to be compatible with both single-phase AC input and three-phase AC input, such as Figure 1 As shown, the first AC contactor may include a contactor switch C1 disposed on a phase cable such as cable L1. A And the contactor switch C2' installed on the neutral wire, the charging protocol controller (CCU) 21 is used to control the contactor switch C1. A And the on / off state of contactor switch C2'.

[0037] The second AC contactor may include a contactor switch C2 mounted on two other phase cables, such as L2 cable and L3 cable. B C2 C And a contactor switch C2 installed on the neutral wire, the equipment controller 11 is used to control the contactor switch C2. B C2C And the on / off state of contactor switch C2.

[0038] By retaining a single-phase contactor switch in the charging gun 20 for use by a single-phase charging gun, the size of the charging gun can be reduced. When the charging gun 20 adopts a three-phase input, the contactor switches of the other two phase inputs can still be controlled in the AC charging pile 10.

[0039] like Figure 1 As shown, the vehicle plug of the charging gun 20 includes seven interfaces, namely three-phase AC lines L1, L2, L3, neutral line N, grounding (PE), connection confirm (CC), and control pilot (CP) interfaces. Similarly, the vehicle socket of the electric vehicle also includes the same seven interfaces to realize the connection between the vehicle plug and the vehicle socket.

[0040] The charging protocol controller 21 is connected to the vehicle controller 31 through the drive signal switching switch S1. The drive signal switching switch S1 is a double-headed switch. When the drive signal switching switch S1 is switched to the PWM terminal, it is used to output a drive control signal with a preset waveform. When the drive signal switching switch S1 is switched to 12V, it does not output a drive control signal, but outputs a steady-state DC voltage.

[0041] like Figure 1 As shown, detection point 1 is the detection point at the CP interface in the charging plug of the charging gun 20. The CP interface is used to connect to the vehicle controller to transmit drive control signals. A first control guide resistor R1 is set between the drive signal switching switch S1 and detection point 1. The electric vehicle also includes an on-board charger 32. The on-board charger 32 is connected to the vehicle controller 31 through the control guide switch S2 and the second control guide resistor R2. The vehicle controller is also connected to the ground wire through the third control guide resistor R3. The CC interface in the charging gun 20 is connected to the ground wire through the fourth control guide resistor R4, the normally closed switch S3 and the fifth control guide resistor RC. The vehicle controller 31 is also connected to the CC interface of the vehicle socket to determine the connection status between the vehicle plug and the vehicle socket through the voltage value of the CC interface.

[0042] The charging protocol controller 21 is also connected to the detection point 1 to determine the target charging state between the charging gun and the electric vehicle based on the change in the voltage value of the detection point 1. The charging protocol controller 21 is also connected to the device controller (DCU) 11 to send charging instruction information to the device controller 11 based on the target charging state between the charging gun and the electric vehicle, so as to instruct the device controller 11 to control the working state of the AC charging pile.

[0043] The communication connection between the device controller 11 and the charging protocol controller 21 can be wired or wireless. For example, the connection methods can be: power line carrier PLC, CAN / CAN FD, RS-485, Modbus, industrial Ethernet, Bluetooth, Wi-Fi, 4G, 5G, NB-IoT, etc. Different connection methods have different transmission distances and transmission characteristics, which can be selected according to actual deployment needs. This embodiment does not impose any restrictions on this.

[0044] The following describes the specific implementation of the charging control method for AC charging piles applied to the charging protocol controller, with reference to the embodiments.

[0045] Figure 2 A flowchart illustrating the charging control method for an AC charging pile provided in this application embodiment. Figure 1 ,like Figure 2 As shown, the method may include: S101. Obtain the voltage change status of the preset detection point between the charging protocol controller and the vehicle controller.

[0046] In this embodiment, the voltage value of detection point 1 between the charging protocol controller and the vehicle controller can represent the target charging state between the charging gun and the vehicle controller, and the change in voltage value can represent the change in the target charging state between the charging gun and the vehicle controller. For example, voltage value 1 indicates exiting the charging state, voltage value 2 indicates entering the charging state, a change from voltage value 1 to voltage value 2 indicates a need to switch from exiting the charging state to entering the charging state, and a change from voltage value 2 to voltage value 1 indicates a need to switch from entering the charging state to exiting the charging state.

[0047] S102. Determine the target charging state between the charging gun and the electric vehicle based on the voltage change.

[0048] In this embodiment, the change in the target charging state between the charging pile and the electric vehicle is determined based on the change in voltage values ​​sampled multiple times, and the changed target charging state between the charging pile and the electric vehicle is determined.

[0049] For example, a change from voltage value 1 to voltage value 2 indicates a switch from exiting the charging state to entering the charging state, and the target charging state is entering the charging state. A change from voltage value 2 to voltage value 1 indicates a switch from entering the charging state to exiting the charging state, and the target charging state is exiting the charging state.

[0050] S103. Based on the target charging state, control the on / off state of the first AC contactor on the charging cable in the charging gun, and send charging instruction information to the equipment controller, so that the equipment controller controls the on / off state of the second AC contactor on the charging cable in the AC charging pile.

[0051] In this embodiment, based on the target charging state, it is determined whether it is necessary to control the charging of the electric vehicle. If the target charging state indicates that it is necessary to control the charging of the electric vehicle, then the contactor switch C1 is controlled. A When contactor switch C2' is turned on, it sends a charging indication message to the equipment controller. If the AC charging pile has a single-phase AC input, the equipment controller only needs to turn on contactor switch C2. If the AC charging pile has a three-phase AC input, the equipment controller controls contactor switch C1. B Contactor switch C1 C The contactor switch C2 is connected.

[0052] When the target charging status indicates that charging to the electric vehicle needs to be stopped, control contactor switch C1. A The contactor switch C2' is disconnected, and a charging indication message is sent to the equipment controller. If the AC charging pile has a single-phase AC input, the equipment controller only needs to control the contactor switch C2 to be turned on. If the AC charging pile has a three-phase AC input, the equipment controller controls the contactor switch C1 to be turned on. B Contactor switch C1 C Disconnect contactor switch C2.

[0053] S104. Control the switching state of the drive signal switching switch according to the target charging state.

[0054] In this embodiment, the drive signal switching switch is a double-ended switch, which can control the charging protocol controller to output a drive control signal or a steady-state DC voltage to the vehicle controller. When the target charging status indicates that charging to the electric vehicle needs to be controlled, the drive signal switching switch is controlled to switch to the drive signal output state. When the target charging status indicates that charging to the electric vehicle needs to be stopped, the drive signal switching switch is controlled to switch to the steady-state voltage output state.

[0055] S105. Send a drive control signal to the vehicle controller through the drive signal switching switch to control the AC charging pile to charge the electric vehicle through the charging gun.

[0056] In this embodiment, if the charging protocol controller sends a drive control signal to the vehicle controller, the contactor switches on the charging cable are also in the conducting state, and the AC charging pile can charge the electric starter through the charging gun.

[0057] If the charging protocol controller stops sending drive control signals to the vehicle controller and outputs a steady-state voltage, the contactor switches on the charging cable will also be in the open state, and the AC charging pile can stop charging the electric vehicle.

[0058] In one possible implementation, the charging protocol controller sends charging gun indication information GUN_STATUS_IND to the device controller. The sending condition is either periodic or when the charging gun is plugged in or unplugged. The charging gun indication information GUN_STATUS_IND can include: charging gun connection status, working status, and working policy. The charging gun connection status is used to indicate whether the connection between the charging gun and the electric vehicle is connected or disconnected. The working status is used to indicate the charging status of the charging gun, such as idle status, charging start status, charging in progress status, charging end status, start failure status, system fault status, etc. The working policy is used to instruct the device controller to interact with the vehicle controller through the charging protocol controller.

[0059] If the voltage at detection point 1 is 12V, the charging gun connection status is disconnected, and the charging gun connection status is idle.

[0060] In one possible implementation, if the target charging state is that the charging gun is connected, the charging indication information is the charging connection information. Figure 3 A flowchart illustrating the charging control method for an AC charging pile provided in this application embodiment. Figure 2 ,like Figure 3 As shown, the method may include: S201. Obtain the voltage change status of the preset detection point between the charging protocol controller and the vehicle controller.

[0061] S202. Determine the target charging state between the charging gun and the electric vehicle based on the voltage change.

[0062] The process described above, S103, which controls the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state and sends charging instruction information to the device controller, may include: S203. Based on the charging gun's connected status, control the first AC contactor to be in the disconnected state and send charging connection information to the device controller, so that the device controller controls the second AC contactor to be in the disconnected state.

[0063] In this embodiment, if the voltage value of the preset detection point drops from the first voltage value to the second voltage value, the target charging state is determined to be the charging gun connected state.

[0064] like Figure 1As shown, when the charging gun is inserted into the electric vehicle, the third control guide resistor R3 in the electric vehicle and the first control guide resistor R1 in the charging gun are connected in series to divide the voltage, causing the voltage value at the preset detection point to drop. Therefore, the insertion of the charging gun into the electric vehicle can be determined based on the drop in the voltage value at the preset detection point. For example, the first voltage value is 12V and the second voltage value is 9V.

[0065] When the target charging status is determined to be that the charging gun is connected, to prevent the AC charging pile or electric vehicle from not meeting the charging conditions, the contactor switch on the charging cable cannot be turned on at this time. Therefore, the charging protocol controller controls contactor switch C1 at this time. A C2' remains disconnected.

[0066] The charging protocol controller sends a charging gun indication message (GUN_STATUS_IND) to the device controller. At this time, the GUN_STATUS_IND message indicates that the charging gun is connected. Upon receiving this message, the device controller controls contactor switch C1. B C1 C C2 remains disconnected, and it determines whether the AC charging station and the electric vehicle meet the charging conditions.

[0067] The device controller determines whether the AC charging station has sufficient power to supply electricity to a newly connected electric vehicle and whether the electric vehicle has charging privileges. The AC charging station has a server; when a user needs to use the AC charging station, they can authenticate their charging through the server. If the authentication is successful, it is determined that the electric vehicle has charging privileges.

[0068] The process of controlling the switching state of the drive signal switching switch according to the target charging state in S104 above may include: S204. Based on the charging gun's connected status, control the drive signal switching switch to switch to the drive signal output state.

[0069] In this embodiment, after the charging gun is inserted into the electric vehicle, the charging protocol controller can control the drive signal switching switch to switch to the drive signal output state so that a drive control signal can be output to the vehicle controller.

[0070] The process of sending a drive control signal to the vehicle controller via the drive signal switching switch in step S105 may include: S205. Receive the maximum charging current parameter sent by the device controller based on the charging connection information.

[0071] In this embodiment, if the device controller determines that the AC charging pile and the electric vehicle meet the charging conditions, it sends a Start Charging START_REQ message to the charging protocol controller. The Start Charging START_REQ message carries the maximum charging current parameter.

[0072] S206. Generate and send a first drive control signal to the vehicle controller based on the maximum charging current parameter, so that the vehicle controller controls the electric vehicle to enter the charging ready state.

[0073] In this embodiment, the charging protocol controller generates a duty cycle PWM square wave that matches the maximum charging current parameter, and transmits the duty cycle PWM square wave to the vehicle controller.

[0074] After the vehicle controller detects the duty cycle PWM square wave at detection point 2, it closes the control guide switch S2 to connect the second control guide resistor R2 in series with the first control guide resistor R1. At this time, the voltage at detection point 1 is further reduced by the voltage division of the second control guide resistor R2. The charging protocol controller can determine that the electric vehicle has entered the charging ready state by this voltage change.

[0075] In one possible implementation, if the target charging state is a charging ready state, the charging indication information is a charging confirmation information. Figure 4 A flowchart illustrating the charging control method for an AC charging pile provided in this application embodiment. Figure 3 ,like Figure 4 As shown, the method may include: S301. Obtain the voltage change status of the preset detection point between the charging protocol controller and the vehicle controller.

[0076] S302. Determine the target charging state between the charging gun and the electric vehicle based on the voltage change.

[0077] The process described above, S103, which controls the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state and sends charging instruction information to the device controller, may include: S303. Based on the charging ready state, control the first AC contactor to be in the conducting state and send charging confirmation information to the equipment controller, so that the equipment controller controls the second AC contactor to be in the conducting state.

[0078] In this embodiment, if the voltage value at the preset detection point drops from the second voltage value to the third voltage value, the target charging state is determined to be a charging ready state.

[0079] like Figure 1As shown, after the vehicle controller detects the duty cycle PWM square wave at detection point 2, it closes the control guide switch S2 to connect the second control guide resistor R2 in series with the first control guide resistor R1. At this time, the voltage at detection point 1 is further reduced by the voltage division of the second control guide resistor R2. Therefore, the charging readiness of the electric vehicle can be determined based on the further decrease in the voltage value of the preset detection point. For example, the third voltage value is 6V.

[0080] When the target charging state is determined to be the charging ready state, the charging protocol controller can control contactor switch C1. A When C2' switches to the ON state, it sends a charging confirmation message START_CNF to the equipment controller. The START_CNF message indicates that the AC charging pile has started charging. After receiving this message, the equipment controller controls contactor switch C1. B C1 C C2 switches to the on state.

[0081] The process of controlling the switching state of the drive signal switching switch according to the target charging state in S104 above may include: S304. Based on the charging ready state, control the drive signal switching switch to switch to the drive signal output state.

[0082] In this embodiment, after determining that charging of the electric vehicle should begin, the charging protocol controller can continue to control the drive signal switching switch to remain in the drive signal output state so that drive control signals can be output to the vehicle controller.

[0083] The process of sending a drive control signal to the vehicle controller via the drive signal switching switch in step S105 may include: S305. Receive the target charging current parameters sent by the device controller based on the charging confirmation information. The target charging current parameters are determined by the device controller based on the grid capacity and the multiple charging guns connected to the AC charging pile.

[0084] In this embodiment, since the AC charging pile of this solution is connected to multiple charging guns, the AC charging pile needs to allocate charging power to the electric vehicles connected to each charging gun.

[0085] Specifically, the device controller determines the number of connected electric vehicles based on whether each charging gun is connected to an electric vehicle. Based on the capacitor capacity, the number of connected electric vehicles, and the charging mode (e.g., fast charging, slow charging) sent by the electric vehicles through the server, it determines the maximum charging power allocated to each electric vehicle and determines the target charging current parameter based on the maximum charging power.

[0086] The device controller sends the current value refresh information UPDATE_IND to the charging protocol controller. The current value refresh information UPDATE_IND carries the target charging current parameter.

[0087] S306. Generate and send a second drive control signal to the vehicle controller based on the target charging current parameters, so that the vehicle controller can determine the maximum allowable input current based on the second drive control signal.

[0088] In this embodiment, the charging protocol controller adjusts the duty cycle of the PWM square wave according to the target charging current parameter. After the vehicle controller detects the duty cycle of the PWM square wave at detection point 2, it determines the maximum charging current that the AC charging pile can provide at this time. Based on the maximum charging current and the electric vehicle's required charging current, it selects the smaller charging current as the electric vehicle's target charging current. The power module of the on-board charger limits the actual charging current to within the target charging current.

[0089] In one possible implementation, if the target charging state is a vehicle-side stopped charging state, the charging indication information is a stopped charging information. Figure 5 A flowchart illustrating the charging control method for an AC charging pile provided in this application embodiment. Figure 4 ,like Figure 5 As shown, the method may include: S401. Obtain the voltage change status of the preset detection point between the charging protocol controller and the vehicle controller.

[0090] S402. Determine the target charging state between the charging gun and the electric vehicle based on the voltage change.

[0091] The process described above, S103, which controls the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state and sends charging instruction information to the device controller, may include: S403. Based on the vehicle-side charging stop status, control the first AC contactor to be in the open state and send a stop charging information to the equipment controller, so that the equipment controller controls the second AC contactor to be in the open state.

[0092] In this embodiment, if the voltage value at the preset detection point rises from the third voltage value to the second voltage value, the target charging state is determined to be the vehicle-side charging stop state.

[0093] like Figure 1As shown, when the electric vehicle is fully charged, or when a charging fault occurs during the charging process, the vehicle controller disconnects the control guide switch S2. The second control guide resistor R2 no longer participates in the voltage division of the first control guide resistor R1, and the voltage at detection point 1 rises. Therefore, the electric vehicle can be stopped from charging based on the rise in the voltage value of the preset detection point.

[0094] When the target charging state is determined to be a vehicle-side charging stop state, the charging protocol controller can control contactor switch C1. A C2' switches to the disconnected state and sends a stop charging message STOP_IND to the equipment controller. The STOP_IND message instructs the AC charging pile to stop charging. After receiving this message, the equipment controller controls contactor switch C1. B C1 C Switch C2 to the disconnected state.

[0095] At this point, the device controller determines that the charging action for the electric vehicle has been completed and can notify the server to send the charging data to the user. Specifically, the charging data can be displayed on the display panel of the AC charging pile or sent to the vehicle terminal or the user's mobile terminal.

[0096] After completing the charging operation, the device controller sends a stop charging confirmation message STOP_CNF to the charging protocol controller.

[0097] The process of controlling the switching state of the drive signal switching switch according to the target charging state in S104 above may include: S404. Based on the vehicle-side charging stop status, control the drive signal switching switch to switch to the steady-state voltage output state.

[0098] In this embodiment, after determining that the electric vehicle has stopped charging, the charging protocol controller no longer needs to send drive control signals to the vehicle controller. Instead, it can control the drive signal switching switch to switch to the steady-state voltage output state so that it can output steady-state voltage to the vehicle controller.

[0099] In one possible implementation, Figure 6 A flowchart illustrating the charging control method for an AC charging pile provided in this application embodiment. Figure 5 ,like Figure 6 As shown, the method may further include: S501. Based on the end-of-charge request sent by the device controller, control the drive signal switching switch to switch to the steady-state voltage output state.

[0100] In this embodiment, when the device controller receives a stop charging request sent by the user through the server due to an AC charging pile malfunction, it sends a stop charging request STOP_REQ to the charging protocol controller. Based on the stop charging request STOP_REQ, the charging protocol controller controls the drive signal switching switch to switch to the steady-state voltage output state, outputs a steady-state voltage to the vehicle controller, and stops sending drive control signals to the vehicle controller.

[0101] The process described above, S103, which controls the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state and sends charging instruction information to the device controller, may include: S502. Based on the vehicle-side charging stop state corresponding to the voltage value change state, control the first AC contactor to be in the open state and send a stop charging information to the equipment controller, so that the equipment controller controls the second AC contactor to be in the open state.

[0102] In this embodiment, when the vehicle controller detects a steady-state voltage at detection point 2, it determines that charging needs to be stopped, and the control guide switch S2 is opened. The second control guide resistor R2 no longer participates in the voltage division of the first control guide resistor R1, and the voltage at detection point 1 rises.

[0103] When the charging protocol controller detects that the voltage at the detection point rises from the third voltage value to the second voltage value, it determines that the target charging state is a vehicle-side charging stop state. The charging protocol controller can then control contactor switch C1. A C2' switches to the disconnected state and sends a stop charging message STOP_IND to the equipment controller. The STOP_IND message instructs the AC charging pile to stop charging. After receiving this message, the equipment controller controls contactor switch C1. B C1 C The C2 connector is switched to a disconnected state. Afterward, the device controller can display the charging data and notify the server or user that the charging process is complete.

[0104] In one possible implementation, if the target charging state is that the charging gun is unplugged, the method may further include: Send a charging gun removal instruction to the device controller so that the AC charging pile enters standby mode.

[0105] In this embodiment, if the voltage value of the preset detection point rises from the second voltage value to the first voltage value, the target charging state is determined to be the state where the charging gun has been unplugged.

[0106] like Figure 1As shown, when the charging gun is pulled out of the electric vehicle, the third control guide resistor R3 in the electric vehicle is disconnected from the first control guide resistor R1 in the charging gun, causing the voltage value at the preset detection point to rise. Therefore, the charging gun can be pulled out of the electric vehicle based on the rise in the voltage value at the preset detection point.

[0107] When the target charging status is determined to be that the charging gun has been unplugged, the charging gun indication information GUN_STATUS_IND is sent to the device controller. At this time, the charging gun indication information GUN_STATUS_IND indicates that the charging gun connection status is disconnected. The device controller refreshes the charging interface (if the AC charging pile has a display screen) according to the disconnected connection status and returns to standby mode to wait for the next charging.

[0108] In one possible implementation, the method may further include: If a charging emergency stop signal is received, the first AC contactor is controlled to disconnect, and a stop charging information is sent to the equipment controller, causing the equipment controller to control the second AC contactor to be in the disconnected state; the drive signal switching switch is controlled to switch to the steady-state voltage output state.

[0109] In this embodiment, the charging gun is equipped with an emergency stop button, which is connected to the charging protocol controller. If an emergency stop signal is received from the emergency stop button during charging, the contactor switch C1 can be controlled. A When C2' is switched to the disconnected state, the AC power input is quickly cut off. The charging protocol controller controls the drive signal switching switch to switch to the steady-state voltage output state, no longer outputting PWM square waves, and sends the stop charging information STOP_IND to the device controller, so that the device controller completes the charging process.

[0110] It should be noted that the charging control method provided in the above embodiment is illustrated using a single charging gun as an example. The AC charging pile is connected to multiple charging guns, and the device controller is also connected to the charging protocol controllers in the multiple charging guns. When each charging protocol controller communicates with the device controller, it carries the identification information of the corresponding charging gun so that the device controller can control the on / off state of the contactor switch on the corresponding cable.

[0111] The charging control method for AC charging piles provided in the above embodiments determines the target charging state based on the voltage change status of preset detection points. It then controls the on / off state of the AC contactor and the switching state of the drive signal switching switch according to the target charging state. This enables the AC charging pile to charge electric vehicles via charging guns. Through interaction between the charging protocol controller in the charging gun and the device controller in the AC charging pile, one AC charging pile can connect to multiple electric vehicles via multiple charging cables extending from multiple charging guns. This allows for charging multiple electric vehicles simultaneously, avoiding the need to build separate AC charging piles for each vehicle. The multiple hardware components originally required for multiple AC charging piles can be integrated into one set, effectively reducing the construction cost of AC charging piles.

[0112] Based on the above method embodiments, this application also provides a charging control device for an AC charging pile, which is applied to a charging protocol controller in a charging gun. The charging protocol controller is connected to the vehicle controller in an electric vehicle through a drive signal switching switch, and the charging protocol controller is also communicatively connected to the equipment controller in the AC charging pile. Figure 7 This is a schematic diagram of the charging control device for an AC charging pile provided in an embodiment of this application, as shown below. Figure 7 As shown, the device may include: The voltage change state determination module 601 is used to obtain the voltage value change state of a preset detection point between the charging protocol controller and the vehicle controller. The target charging state determination module 602 is used to determine the target charging state between the charging gun and the electric vehicle based on the voltage value change state. The control module 603 is used to control the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state, and send charging instruction information to the equipment controller so that the equipment controller controls the on / off state of the second AC contactor on the charging cable in the AC charging pile. The control module 603 is also used to control the switching state of the drive signal switching switch according to the target charging state; and to send a drive control signal to the vehicle controller through the drive signal switching switch to control the AC charging pile to charge the electric vehicle through the charging gun.

[0113] Optionally, if the target charging state is that the charging gun is connected, the charging indication information is the charging connection information; the control module 603 is specifically used to control the first AC contactor to be in the disconnected state according to the charging gun connection state, and send the charging connection information to the equipment controller, so that the equipment controller controls the second AC contactor to be in the disconnected state; control the drive signal switching switch to the drive signal output state according to the charging gun connection state; receive the maximum charging current parameter sent by the equipment controller according to the charging connection information; generate and send a first drive control signal to the vehicle controller according to the maximum charging current parameter, so that the vehicle controller controls the electric vehicle to enter the charging ready state.

[0114] Optionally, if the target charging state is a charging ready state, the charging indication information is a charging confirmation information; the control module 603 is specifically used to control the first AC contactor to be in the conducting state according to the charging ready state, and send the charging confirmation information to the equipment controller, so that the equipment controller controls the second AC contactor to be in the conducting state; according to the charging ready state, control the drive signal switching switch to switch to the drive signal output state; receive the target charging current parameter sent by the equipment controller according to the charging confirmation information, the target charging current parameter being determined by the equipment controller based on the grid capacity and the multiple charging guns connected to the AC charging pile; generate and send a second drive control signal to the vehicle controller according to the target charging current parameter, so that the vehicle controller determines the maximum allowable input current according to the second drive control signal.

[0115] Optionally, if the target charging state is a vehicle-side stopped charging state and the charging indication information is stopped charging information, the control module 603 is specifically used to control the first AC contactor to be in the open state according to the vehicle-side stopped charging state, and send the stopped charging information to the equipment controller, so that the equipment controller controls the second AC contactor to be in the open state; and control the drive signal switching switch to switch to the steady-state voltage output state according to the vehicle-side stopped charging state.

[0116] Optionally, the control module 603 is further configured to control the drive signal switching switch to switch to the steady-state voltage output state according to the end-of-charge request sent by the device controller; and control the first AC contactor to be in the open state according to the vehicle-side stop-charging state corresponding to the voltage value change state, and send stop-charging information to the device controller, so that the device controller controls the second AC contactor to be in the open state.

[0117] Optionally, if the target charging state is that the charging gun has been unplugged, the control module 603 is also used to send a charging gun unplugging instruction to the device controller so that the AC charging pile enters standby mode.

[0118] Optionally, the control module 603 is also configured to, upon receiving a charging emergency stop signal, control the first AC contactor to disconnect and send a stop charging message to the equipment controller, so that the equipment controller controls the second AC contactor to be in the disconnected state; and control the drive signal switching switch to switch to the steady-state voltage output state.

[0119] The above-described device is used to execute the method provided in the foregoing embodiments, and its implementation principle and technical effect are similar, so they will not be described again here.

[0120] These modules can be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), one or more microprocessors, or one or more Field Programmable Gate Arrays (FPGAs). Alternatively, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together as a system-on-a-chip (SOC).

[0121] Figure 8 This is a schematic diagram of a charging protocol controller provided in an embodiment of this application. The charging protocol controller 21 may include a processor 211, a storage medium 212, and a bus. The storage medium 212 stores program instructions executable by the processor 211. When the charging protocol controller 21 is running, the processor 211 communicates with the storage medium 212 via the bus, and the processor 211 executes the program instructions to perform the above-described method embodiment. The specific implementation and technical effects are similar and will not be described in detail here.

[0122] Optionally, this application also provides a computer-readable storage medium storing a computer program, which is executed by a processor to perform the above-described method embodiments.

[0123] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0124] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0125] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in a combination of hardware and software functional units.

[0126] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application. 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.

[0127] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A charging control method for an AC charging pile, characterized in that, A charging protocol controller is used in a charging gun, the charging protocol controller is connected to a vehicle controller in an electric vehicle via a drive signal switching switch, and the charging protocol controller is also communicatively connected to a device controller in an AC charging pile, the method comprising: Acquire the voltage change status of a preset detection point between the charging protocol controller and the vehicle controller; Based on the voltage value change, the target charging state between the charging gun and the electric vehicle is determined; According to the target charging state, the on / off state of the first AC contactor on the charging cable in the charging gun is controlled, and charging instruction information is sent to the device controller, so that the device controller controls the on / off state of the second AC contactor on the charging cable in the AC charging pile; The switching state of the drive signal switching switch is controlled according to the target charging state. The drive signal switching switch sends a drive control signal to the vehicle controller to control the AC charging pile to charge the electric vehicle through the charging gun.

2. The method as described in claim 1, characterized in that, If the target charging state is that the charging gun is connected, the charging indication information is charging connection information; the step of controlling the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state and sending the charging indication information to the device controller includes: Based on the charging gun's connected status, the first AC contactor is controlled to be in a disconnected state, and the charging connection information is sent to the device controller, causing the device controller to control the second AC contactor to be in a disconnected state. The step of controlling the switching state of the drive signal switching switch according to the target charging state includes: Based on the charging gun's connected status, control the drive signal switching switch to switch to the drive signal output state; Sending drive control signals to the vehicle controller via the drive signal switching switch includes: Receive the maximum charging current parameter sent by the device controller based on the charging connection information; A first drive control signal is generated based on the maximum charging current parameter and sent to the vehicle controller, so that the vehicle controller controls the electric vehicle to enter the charging ready state.

3. The method as described in claim 2, characterized in that, If the target charging state is a charging ready state, the charging indication information is a charging confirmation information; the step of controlling the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state and sending the charging indication information to the device controller includes: Based on the charging ready state, the first AC contactor is controlled to be in the conducting state, and the charging confirmation information is sent to the device controller, so that the device controller controls the second AC contactor to be in the conducting state. The step of controlling the switching state of the drive signal switching switch according to the target charging state includes: Based on the charging ready state, control the drive signal switching switch to switch to the drive signal output state; Sending drive control signals to the vehicle controller via the drive signal switching switch includes: The device receives a target charging current parameter sent by the device controller based on the charging confirmation information. The target charging current parameter is determined by the device controller based on the grid capacity and the multiple charging guns connected to the AC charging pile. A second drive control signal is generated based on the target charging current parameter and sent to the vehicle controller, so that the vehicle controller determines the maximum allowable input current based on the second drive control signal.

4. The method as described in claim 1, characterized in that, If the target charging state is a vehicle-side charging stop state, and the charging indication information is a charging stop information, then according to the target charging state, controlling the on / off state of the first AC contactor on the charging cable in the charging gun and sending the charging indication information to the device controller includes: Based on the vehicle-side charging stop status, the first AC contactor is controlled to be in the open state, and the charging stop information is sent to the device controller, so that the device controller controls the second AC contactor to be in the open state; The step of controlling the switching state of the drive signal switching switch according to the target charging state includes: Based on the vehicle-side charging stop status, control the drive signal switching switch to switch to the steady-state voltage output state.

5. The method as described in claim 1, characterized in that, The method further includes: Based on the end-of-charge request sent by the device controller, the drive signal switching switch is controlled to switch to the steady-state voltage output state; The step of controlling the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state, and sending charging instruction information to the device controller, includes: Based on the vehicle-side charging stop state corresponding to the voltage value change state, the first AC contactor is controlled to be in the open state, and a charging stop information is sent to the equipment controller, causing the equipment controller to control the second AC contactor to be in the open state.

6. The method as described in claim 1, characterized in that, If the target charging state is that the charging gun is unplugged, the method further includes: Send a charging gun removal instruction to the device controller so that the AC charging pile enters standby mode.

7. The method as described in claim 1, characterized in that, The method further includes: If a charging emergency stop signal is received, the first AC contactor is controlled to disconnect, and a stop charging information is sent to the device controller, causing the device controller to control the second AC contactor to be in the disconnected state. Control the drive signal switching switch to switch to steady-state voltage output state.

8. A charging control device for an AC charging pile, characterized in that, A charging protocol controller for use in a charging gun, the charging protocol controller being connected to a vehicle controller in an electric vehicle via a drive signal switching switch, and also communicatively connected to an equipment controller in an AC charging pile, the device comprising: A voltage change state determination module is used to obtain the voltage value change state of a preset detection point between the charging protocol controller and the vehicle controller; The target charging state determination module is used to determine the target charging state between the charging gun and the electric vehicle based on the voltage value change state. The control module is used to control the on / off state of the first AC contactor on the charging cable in the charging gun according to the target charging state, and send charging instruction information to the device controller, so that the device controller controls the on / off state of the second AC contactor on the charging cable in the AC charging pile. The control module is also used to control the switching state of the drive signal switching switch according to the target charging state; and to send a drive control signal to the vehicle controller through the drive signal switching switch to control the AC charging pile to charge the electric vehicle through the charging gun.

9. An AC charging system, characterized in that, The AC charging system includes: AC charging piles, multiple charging guns, and multiple electric vehicles; The AC charging piles are connected to the multiple charging guns via multiple charging cables, and the charging plug of each charging gun is connected to the charging socket of each electric vehicle. The device controller in the AC charging pile is communicatively connected to the charging protocol controller in each charging gun. The charging protocol controller in each charging gun is connected to the control terminal of the first AC contactor on the charging cable in each charging gun. The charging protocol controller in each charging gun is connected to the vehicle controller in each electric vehicle through the drive signal switching switch in each charging gun. The device controller is connected to the control terminal of the second AC contactor on multiple charging cables in the AC charging pile; The charging protocol controller is used to execute the charging control method of the AC charging pile as described in any one of claims 1 to 7.

10. A charging protocol controller, characterized in that, include: The device includes a processor, a storage medium, and a bus. The storage medium stores program instructions executable by the processor. When the charging protocol controller is running, the processor communicates with the storage medium via the bus. The processor executes the program instructions to perform the steps of the charging control method for an AC charging pile as described in any one of claims 1 to 7.

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