An AC charging pile communication control device and a control method

Abstract

The present invention relates to the technical field of power regulation and control, and specifically relates to an AC charging pile communication regulation device and a regulation method. The device includes a charging pile simulation circuit, an MCU control module, an in-vehicle charging simulation circuit, a sampling circuit, and a communication module; based on the charging pile simulation circuit and the in-vehicle charging simulation circuit, handshake connections are respectively made with the AC charging pile and the in-vehicle charging end; the maximum charging power of the AC charging pile is obtained through the communication module; the current given value is determined according to the maximum charging power to obtain a duty cycle given signal, and the duty cycle given signal is converted into a PWM analog signal; according to the determined duty cycle of the PWM analog signal, the charging current mapped and matched with the same duty cycle is determined; the PWM analog signal is updated to adjust the charging current until the AC charging pile stops charging. By directly controlling the output power of the AC charging pile, the charging load can be evenly distributed in different time periods and regions, improving the utilization rate of the power grid and the power supply reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of power regulation and control, and particularly to an AC charging pile communication regulation and control device and a regulation and control method. Background Technique

[0002] With the rapid growth of the number of electric vehicles, the supporting charging facilities for electric vehicles have also been massively connected to the public power grid, which has had a strong impact on the distribution network. Moreover, traditional distribution transformers and line cables did not consider the charging load of electric vehicles during the initial construction, and it is difficult to meet the increasing charging demand of electric vehicles. The working time of charging piles highly coincides with the peak load time, which is extremely likely to cause overload tripping and affect the normal power supply to residents. Therefore, it is necessary to implement the operation regulation and management of charging piles to ensure the stable operation of the power supply in the distribution network.

[0003] After investigation, high-power DC charging piles have achieved network control through vehicle networking platforms or TCU control devices, etc. However, AC charging piles do not have any communication interfaces, and the charging mechanism of AC charging piles can only support full-power operation or stop working under actual working conditions, and cannot actively adjust the charging power of the charging pile. Moreover, the charging times of distributed AC charging piles with a large stock are concentrated, and the remaining available capacity in the low-voltage substation area is insufficient, which is likely to cause a load impact on the public transformer substation area.

[0004] The existing Chinese patent publication number CN117416229A discloses an orderly charging management device and method for an electric vehicle AC charging pile. Although the backend orderly charging control device is respectively connected to the disorderly charging pile and the on-vehicle charging end, the CP connection method of the backend orderly charging control device is the same as the original CP direct connection method, and only receives the charging queue sequence of the cloud management and dispatching platform, so as to control the backend orderly charging control device to achieve the orderly charging of the charging pile, and still charges the vehicle through the PWM duty ratio output by the AC charging pile, and cannot actively perform PWM duty ratio signal regulation. Summary of the Invention

[0005] To solve the above problems, on the one hand, the present invention provides an AC charging pile communication regulation and control device, which is arranged between the AC charging pile and the on-vehicle charging end. The device includes a charging pile simulation circuit, an MCU control module, an on-vehicle charging simulation circuit, a sampling circuit, and a communication module; the charging pile simulation circuit and the on-vehicle charging simulation circuit are respectively connected to the MCU control module through the sampling circuit, and the MCU control module is electrically connected to the communication module;

[0006] The charging pile simulation circuit is used to connect an AC charging pile to transmit simulation signals, simulate the connection between the AC charging pile and the on-vehicle charging end, so that the AC charging pile determines the handshake with the on-vehicle charging end according to the simulation signal of the AC charging pile communication control device, triggers the AC charging pile to switch to the PWM connection state, and performs the power supply work;

[0007] The on-vehicle charging simulation circuit is used to detect the connection feedback signal of the on-vehicle charging end, generate an AC charging pile simulation signal to connect with the on-vehicle charging end, so that the on-vehicle charging end determines the handshake with the AC charging pile according to the simulation signal of the AC charging pile communication control device, triggers the on-vehicle charging end to switch to the charging state; and receives the PWM output signal of the MCU control module and transmits it to the on-vehicle charging end to adjust the maximum charging power.

[0008] The sampling circuit is used to detect the loop voltage signals of the charging pile simulation circuit and the on-vehicle charging simulation circuit respectively, and transmit them to the MCU control module;

[0009] The MCU control module is used to receive the loop voltage signal of the sampling circuit, judge the connection state of the charging pile simulation circuit and the on-vehicle charging simulation circuit, and perform the switching between the DC or PWM output modes; and receive the maximum charging power signal of the communication module, calculate the duty cycle of the PWM output signal based on the maximum charging power signal, and transmit it to the on-vehicle charging simulation circuit;

[0010] The communication module is used to upload the startup and operation state of the AC charging pile, and receive the maximum charging power signal of the AC charging pile issued by the substation area and transmit it to the MCU control module.

[0011] As a specific implementation manner, the AC charging pile communication control device is respectively connected to the AC charging pile and the on-vehicle charging end through the charging CP line.

[0012] The charging pile simulation circuit is connected to the power supply control circuit of the AC charging pile, and the on-vehicle charging simulation circuit is electrically connected to the on-vehicle charging end.

[0013] Wherein, the charging pile simulation circuit includes a fourth resistor R4, a fifth resistor R5 and a third switch S3, and the third switch S3 is connected in series with the fifth resistor R5 and then connected in parallel with the fourth resistor R4; one end of the fourth resistor R4 is connected to the power supply control circuit, and the other end is grounded.

[0014] The on-vehicle charging simulation circuit includes a fourth switch S4 and a sixth resistor R6, one end of the fourth switch is connected in series with the sixth resistor R6, and the other end is connected to the DC output end or the PWM output end of the MCU control module; the sixth resistor R6 is connected to the on-vehicle charging end through the charging CP line.

[0015] The AC charging pile communication control device sets a first detection point at the connection of the first resistor R1 of the power supply control circuit and the charging pile simulation circuit; sets a second detection point at the parallel node of the fourth resistor R4 and the fifth resistor R5 of the charging pile simulation circuit; sets a third detection point at the series node of the diode D1 and the third resistor R3 of the charging control module; and sets a fourth detection point at the connection of the sixth resistor R6 of the in-vehicle charging simulation circuit and the charging CP line.

[0016] The MCU control module is further configured to receive the detection signals of the first detection point, the second detection point, the third detection point, and the fourth detection point, and control the switching and closing of the charging pile simulation circuit and the in-vehicle charging simulation circuit according to the detection signals of the first detection point and the third detection point; and adjust the simulation states of the charging pile simulation circuit and the in-vehicle charging simulation circuit based on the second detection point and the fourth detection point.

[0017] On the other hand, the present invention also provides an AC charging pile communication control method, which is applied to the above-mentioned AC charging pile communication control device. The specific steps of the method include:

[0018] Step 1: Based on the charging pile simulation circuit and the in-vehicle charging simulation circuit, perform handshake connections with the AC charging pile and the in-vehicle charging terminal respectively.

[0019] Step 2: Based on the AC charging pile, perform a start power supply operation, and obtain the maximum charging power of the AC charging pile through the communication module.

[0020] Step 3: The MCU control module obtains the power supply voltage signal of the AC charging pile, determines the current set value according to the maximum charging power, obtains the duty cycle set signal based on the current set value, and converts the duty cycle set signal into a PWM analog signal.

[0021] Step 4: According to the duty cycle of the determined PWM analog signal, the in-vehicle charging terminal determines the actual charging current mapped and matched with the same duty cycle.

[0022] Step 5: Continuously obtain the maximum charging power of the AC charging pile issued by the substation area, update the PWM analog signal, and adjust the actual charging current until the AC charging pile stops charging.

[0023] In a specific implementation manner, determining the charging current mapped and matched with the same duty cycle according to the duty cycle of the determined PWM analog signal specifically includes:

[0024] When the duty cycle D of the PWM analog signal is less than 8% or greater than 97%, the actual charging current is zero and charging is not allowed.

[0025] When the duty cycle D of the PWM analog signal is greater than or equal to 8% and less than 10%, the maximum value Imax of the actual charging current is 6A.

[0026] When the duty cycle D of the PWM analog signal is greater than or equal to 10% and less than 85%, the maximum value of the actual charging current Imax = (D * 100) * 0.6;

[0027] When the duty cycle D of the PWM analog signal is greater than or equal to 85% and less than or equal to 97%, the actual charging current Imax = (D * 100 - 64) * 2.5 and is less than or equal to 63A.

[0028] Beneficial effects: The present invention is an AC charging pile communication regulation device and regulation method. By directly controlling the output power of the AC charging pile, the charging load can be evenly distributed in different time periods and regions, avoiding problems such as sudden increase in charging load and grid overload, thereby greatly improving the utilization rate of the power grid and the power supply reliability.

[0029] Optimizing the charging process: By simulating the handshake connection between the AC charging pile and the in-vehicle charging terminal, it is ensured that the AC charging pile can correctly switch to the PWM connection state and perform the power supply work, and at the same time, the in-vehicle charging terminal can switch to the charging state according to the analog signal, thus optimizing the entire charging process.

[0030] Dynamically regulating the charging power: The device can dynamically adjust the duty cycle of the PWM output signal according to the maximum charging power signal issued by the substation area, and then adjust the maximum charging power of the in-vehicle charging terminal to meet the remaining available capacity of the low-voltage substation area, realizing the dynamic regulation of the charging load.

[0031] Improving the charging efficiency: By obtaining the maximum charging power of the AC charging pile issued by the substation area in real time and updating the duty cycle of the PWM analog signal, the charging current can be adjusted in real time to ensure the efficiency and safety of the charging process.

[0032] Simplifying the upgrade of charging equipment: Since the regulation device can be connected between the existing AC charging pile and the in-vehicle charging terminal, there is no need to conduct large-scale hardware upgrades on the existing equipment, simplifying the upgrade process of the charging equipment.

[0033] Enhancing the stability of the power grid: By using the regulation device, the problem of power grid instability caused by excessive charging load can be effectively avoided, which helps to enhance the stability and reliability of the entire power grid.

[0034] Facilitating management and monitoring: The communication module can receive the instructions and information issued by the substation area, facilitating the management and monitoring of the charging process and improving the management efficiency of the charging station. Description of the Drawings

[0035] Figure 1 It is the circuit diagram of the AC charging pile communication regulation device. Detailed Embodiment

[0036] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0037] Referring to Figure 1 , this embodiment provides a communication regulation device for an AC charging pile, which is arranged between the AC charging pile and the in-vehicle charging terminal. The communication regulation device for the AC charging pile includes a charging pile simulation circuit, an MCU control module, an in-vehicle charging simulation circuit, a sampling circuit, and a communication module; the charging pile simulation circuit and the in-vehicle charging simulation circuit are respectively connected to the MCU control module via the sampling circuit, and the MCU control module is electrically connected to the communication module.

[0038] The charging pile simulation circuit is used to connect the AC charging pile to transmit simulation signals, simulate the connection between the AC charging pile and the in-vehicle charging terminal, so that the AC charging pile determines the handshake with the in-vehicle charging terminal according to the simulation signals of the communication regulation device for the AC charging pile, triggers the AC charging pile to switch to the PWM connection state, and performs the power supply work;

[0039] The in-vehicle charging simulation circuit is used to detect the connection feedback signal of the in-vehicle charging terminal, and generate an AC charging pile simulation signal to connect with the in-vehicle charging terminal, so that the in-vehicle charging terminal determines the handshake with the AC charging pile according to the simulation signals of the communication regulation device for the AC charging pile, triggers the in-vehicle charging terminal to switch to the charging state; and receives the PWM output signal of the MCU control module and transmits it to the in-vehicle charging terminal to adjust the maximum charging power.

[0040] The sampling circuit is used to respectively detect the loop voltage signals of the charging pile simulation circuit and the in-vehicle charging simulation circuit, and transmit them to the MCU control module;

[0041] The MCU control module is used to receive the loop voltage signals of the sampling circuit, judge the connection states of the charging pile simulation circuit and the in-vehicle charging simulation circuit, and perform the switching between the DC or PWM output modes; and receive the maximum charging power signal of the communication module, calculate the duty ratio of the PWM output signal based on the maximum charging power signal, and transmit it to the in-vehicle charging simulation circuit;

[0042] The communication module is used to upload the startup and operation status of the AC charging pile, and receive the maximum charging power signal of the AC charging pile issued by the substation area and transmit it to the MCU control module.

[0043] In practical applications, the AC charging pile and the in-vehicle charging terminal are connected by a charging gun line, wherein the charging output terminal of the AC charging pile is connected to the charging input terminal of the in-vehicle charging terminal through a charging phase line; the power supply control circuit of the AC charging pile and the charging control module of the in-vehicle charging terminal are connected through a charging CP line.

[0044] The power supply control circuit of the AC charging pile includes a DC voltage output port, a PWM output port, a first switch S1, and a first resistor R1. The DC voltage output port and the PWM output port are connected in series with one end of the first resistor R1 through the first switch S1.

[0045] The charging control module of the in-vehicle charging terminal includes a second switch S2, a second resistor R2, a third resistor R3, and a diode D1. One end of the diode D1 is connected in series with the third resistor R3 to the ground, and the second switch S2 is connected in series with the second resistor R2 and then connected in parallel with the third resistor R3.

[0046] In order to realize the charging load regulation of the AC charging pile and meet the remaining available capacity of the low-voltage substation area. The innovation of this application is to disconnect the original charging CP line, and the AC charging pile communication regulation device is connected between the power supply control circuit of the AC charging pile and the charging CP line, that is, the input end of the AC charging pile communication regulation device is connected to the AC charging pile, and its output end is connected to the in-vehicle charging terminal through the CP line. Thus, the charging pile simulation loop is connected to the power supply control circuit of the AC charging pile, and the in-vehicle charging simulation loop is electrically connected to the in-vehicle charging terminal.

[0047] The charging pile simulation loop includes a fourth resistor R4, a fifth resistor R5, and a third switch S3. The third switch S3 is connected in series with the fifth resistor R5 and then connected in parallel with the fourth resistor R4; one end of the fourth resistor R4 is connected to the power supply control circuit, and the other end is grounded.

[0048] The in-vehicle charging simulation loop includes a fourth switch S4 and a sixth resistor R6. One end of the fourth switch is connected in series with the sixth resistor R6, and the other end is connected to the DC output end or the PWM output end of the MCU control module; the sixth resistor R6 is connected to the in-vehicle charging terminal through the charging CP line.

[0049] The AC charging pile communication regulation device sets a first detection point at the connection between the power supply control circuit R1 and the charging pile simulation loop; sets a second detection point at the parallel node of the charging pile simulation loop R4 and R5; sets a third detection point at the series node of the diode D1 and R3 in the charging control module; sets a fourth detection point at the connection between the in-vehicle charging simulation loop R6 and the charging CP line.

[0050] The MCU control module is used to receive the detection signals of the first detection point, the second detection point, the third detection point, and the fourth detection point, and control the switching and closing of the third switch S3 and the fourth switch S4 according to the detection signals of the first detection point and the third detection point; adjust the simulation states of the charging pile simulation loop and the in-vehicle charging simulation loop based on the second detection point and the fourth detection point.

[0051] In a specific embodiment, when an AC charging pile is connected to an in-vehicle charging terminal through a charging gun cable, the charging control module of the in-vehicle charging terminal performs CP detection. At this time, the first switch S1 of the power supply control circuit of the AC charging pile is initially closed to the DC voltage output port. The DC voltage output port is connected in series with a first resistor R1 to output a DC 12V voltage to the charging simulation circuit (the fourth resistor R4 and the fifth resistor R5 are in parallel, and the third switch S3 is in the open state). The voltage value at the first detection point drops to 9V, and the AC charging pile is simulated by the charging pile simulation circuit to establish a connection handshake with the in-vehicle charging terminal. The MCU control module receives the detection signal at the first detection point. Similarly, the fourth switch S4 is controlled to close and conduct the DC output terminal. The DC output terminal is connected in series with a sixth resistor R6 to the third resistor R3, so that the in-vehicle charging simulation circuit simulates the AC charging pile to establish a connection handshake with the in-vehicle charging terminal.

[0052] After the power supply control circuit of the AC charging pile detects and establishes a connection handshake, the first switch S1 is switched to close and conduct the PWM output port of the power supply control circuit. A PWM signal is transmitted from the PWM output port to the communication regulation device of the AC charging pile. After the second detection point of the charging pile simulation circuit detects the PWM signal, the MCU control module controls the fourth switch S4 to close and conduct the PWM output terminal. The charging control module of the in-vehicle charging terminal detects the PWM analog signal transmitted by the in-vehicle charging simulation circuit, and the second switch S2 closes and conducts. R2 and R3 are in parallel, so that the voltage of the PWM analog signal transmitted by the in-vehicle charging simulation circuit decreases; after the fourth detection point detects the voltage decrease, the MCU control module controls the third switch S3 to close and conduct. R4 and R5 are in parallel, so that the voltage of the PWM signal transmitted by the power supply control circuit of the AC charging pile decreases. The AC charging pile is simulated by the charging pile simulation circuit to successfully receive the PWM signal, and the AC charging pile closes the internal main relay and conducts its charging output terminal to supply power. Based on this, the AC charging pile does not control the in-vehicle charging terminal to perform AC charging with its own generated PWM signal, but is received and intercepted by the charging pile simulation circuit of the AC charging pile communication regulation device. The in-vehicle charging terminal actually determines the maximum charging power according to the duty cycle of the PWM analog signal output by the MCU control module.

[0053] Based on an AC charging pile communication regulation device provided in the above embodiment, an AC charging pile communication regulation method is also provided. The specific steps of the method are as follows:

[0054] Step one: Based on the charging pile simulation circuit and the in-vehicle charging simulation circuit, establish handshake connections with the AC charging pile and the in-vehicle charging terminal respectively;

[0055] Step two: Based on the AC charging pile to execute the start-up power supply operation, obtain the maximum charging power of the AC charging pile through the communication module;

[0056] When the AC charging pile performs the start power supply operation, it indicates that the connection of the charging gun line between the AC charging pile and the in-vehicle charging terminal has been completed, and the CP detection of the in-vehicle charging terminal has been completed, waiting to receive the duty cycle of the PWM signal for charging.

[0057] Connect to the substation terminal through the communication module. The substation terminal stores the maximum available capacity of the substation. Through the communication modules of different AC charging piles, obtain the number of currently operating AC charging piles, and calculate and determine the maximum charging power of the newly started AC charging pile. The formula is:

[0058] Maximum charging power W = Maximum available capacity of the substation Q / Number of AC charging piles N.

[0059] Step 3: The MCU control module obtains the power supply voltage signal of the AC charging pile, determines the current set value according to the maximum charging power, obtains the duty cycle set signal based on the current set value, and converts the duty cycle set signal into a PWM analog signal;

[0060] The MCU control module obtains the maximum charging power W through the communication module, and obtains the power supply voltage signal U of the AC charging pile through the sampling circuit, and calculates the current set value according to the maximum charging power W and the power supply voltage signal U I Q , I Q = Maximum charging power W / Power supply voltage signal U.

[0061] The MCU control module obtains the duty cycle set signal according to the current set value, and converts the duty cycle set signal into a PWM analog signal.

[0062] Step 4: According to the duty cycle of the determined PWM analog signal, the in-vehicle charging terminal determines the actual charging current mapped and matched with the same duty cycle;

[0063] When the duty cycle D of the PWM analog signal is less than 8% or greater than 97%, the actual charging current is zero and charging is not allowed;

[0064] When the duty cycle D of the PWM analog signal is greater than or equal to 8% and less than 10%, the maximum actual charging current Imax is 6A;

[0065] When the duty cycle D of the PWM analog signal is greater than or equal to 10% and less than 85%, the maximum actual charging current Imax = (D * 100) * 0.6;

[0066] When the duty cycle D of the PWM analog signal is greater than or equal to 85% and less than or equal to 97%, the actual charging current Imax = (D * 100 - 64) * 2.5 and is less than or equal to 63A.

[0067] Step 5: Obtain the maximum charging power of the AC charging pile sent by the substation area in real time, update the PWM analog signal, and adjust the actual charging current until the AC charging pile stops charging.

Claims

1. An AC charging pile communication control device is arranged between the AC charging pile and the in-vehicle charging end, and is characterized in that, The device includes a charging pile simulation circuit, an MCU control module, a vehicle-mounted charging simulation circuit, a sampling circuit, and a communication module; the charging pile simulation circuit and the vehicle-mounted charging simulation circuit are respectively connected to the MCU control module via the sampling circuit, and the MCU control module is electrically connected to the communication module; The charging pile simulation circuit is used to connect to an AC charging pile to transmit simulation signals, simulate the connection between the AC charging pile and the vehicle-mounted charging end, so that the AC charging pile judges to handshake with the vehicle-mounted charging end according to the simulation signals of the AC charging pile communication control device, triggers the AC charging pile to switch to the PWM connection state, and performs the power supply work; The vehicle-mounted charging simulation circuit is used to detect the connection feedback signal of the vehicle-mounted charging end, and generate an AC charging pile simulation signal to connect to the vehicle-mounted charging end, so that the vehicle-mounted charging end judges to handshake with the AC charging pile according to the simulation signals of the AC charging pile communication control device, and triggers the vehicle-mounted charging end to switch to the charging state; And receive the PWM output signal of the MCU control module and transmit it to the vehicle-mounted charging end to adjust the maximum charging power; The sampling circuit is used to respectively detect the loop voltage signals of the charging pile simulation circuit and the vehicle-mounted charging simulation circuit, and transmit them to the MCU control module; The MCU control module is used to receive the loop voltage signals of the sampling circuit, judge the connection states of the charging pile simulation circuit and the vehicle-mounted charging simulation circuit, and switch between the DC or PWM output modes; and receive the maximum charging power signal of the communication module, calculate the duty cycle of the PWM output signal based on the maximum charging power signal, and transmit it to the vehicle-mounted charging simulation circuit; The communication module is used to upload the startup and operation status of the AC charging pile, and receive the maximum charging power signal of the substation area and transmit it to the MCU control module; The charging pile simulation circuit includes a fourth resistor R4, a fifth resistor R5, and a third switch S3. The third switch S3 is connected in series with the fifth resistor R5 and then connected in parallel with the fourth resistor R4; one end of the fourth resistor R4 is connected to the power supply control circuit, and the other end is grounded; The vehicle-mounted charging simulation circuit includes a fourth switch S4 and a sixth resistor R6. One end of the fourth switch is connected in series with the sixth resistor R6, and the other end is connected to the DC output end or the PWM output end of the MCU control module; the sixth resistor R6 is connected to the vehicle-mounted charging end via the charging CP line.

2. The AC charging pile communication control device according to claim 1, wherein The AC charging pile communication control device is connected to the AC charging pile and the vehicle-mounted charging end respectively via the charging CP line.

3. The AC charging pile communication control device according to claim 2, characterized in that, The charging pile simulation circuit is connected to the power supply control circuit of the AC charging pile, and the vehicle-mounted charging simulation circuit is electrically connected to the vehicle-mounted charging end.

4. The AC charging pile communication control device according to claim 1, characterized in that, The power supply control circuit of the AC charging pile includes a DC voltage output port, a PWM output port, a first switch S1 and a first resistor R1. The DC voltage output port and the PWM output port are connected in series with one end of the first resistor R1 through the first switch S1. The charging control module of the in-vehicle charging terminal includes a second switch S2, a second resistor R2, a third resistor R3 and a diode D1. One end of the diode D1 is connected in series with the third resistor R3 to the ground, and the second switch S2 is connected in series with the second resistor R2 and then connected in parallel with the third resistor R3. The communication regulation device of the AC charging pile sets a first detection point at the connection between the first resistor R1 of the power supply control circuit and the charging pile simulation loop; sets a second detection point at the parallel node of the fourth resistor R4 and the fifth resistor R5 in the charging pile simulation loop; sets a third detection point at the series node of the diode D1 and the third resistor R3 in the charging control module; sets a fourth detection point at the connection between the sixth resistor R6 and the charging CP line in the in-vehicle charging simulation loop.

5. The AC charging pile communication control device according to claim 4, characterized in that, The MCU control module is also used to receive the detection signals of the first detection point, the second detection point, the third detection point and the fourth detection point, and control the switching and closing of the charging pile simulation loop and the in-vehicle charging simulation loop according to the detection signals of the first detection point and the third detection point; adjust the simulation states of the charging pile simulation loop and the in-vehicle charging simulation loop based on the second detection point and the fourth detection point.

6. A communication regulation method for an AC charging pile, applied to the AC charging pile communication regulation device according to any one of claims 1-5, characterized in that, Including: Step 1: Based on the charging pile simulation loop and the in-vehicle charging simulation loop, perform handshake connections with the AC charging pile and the in-vehicle charging terminal respectively. Step 2: Based on the AC charging pile, execute the start power supply operation, and obtain the maximum charging power of the AC charging pile through the communication module. Step 3: The MCU control module obtains the power supply voltage signal of the AC charging pile, determines the current given value according to the maximum charging power, obtains the duty cycle given signal based on the current given value, and converts the duty cycle given signal into a PWM analog signal. Step 4: According to the duty cycle of the determined PWM analog signal, the in-vehicle charging terminal determines the actual charging current mapped and matched with the same duty cycle. Step 5: Continuously obtain the maximum charging power of the AC charging pile issued by the substation area, update the PWM analog signal, and adjust the actual charging current until the AC charging pile stops charging.

7. The communication regulation method of the AC charging pile according to claim 6, characterized in that The determination of the charging current mapped and matched with the same duty cycle according to the determined duty cycle of the PWM analog signal is specifically as follows: When the duty cycle D of the PWM analog signal is less than 8% or greater than 97%, the actual charging current is zero and charging is not allowed. When the duty cycle D of the PWM analog signal is greater than or equal to 8% and less than 10%, the maximum value Imax of the actual charging current is 6A. When the duty cycle D of the PWM analog signal is greater than or equal to 10% and less than 85%, the maximum value Imax of the actual charging current = (D * 100) * 0.

6. When the duty cycle D of the PWM analog signal is greater than or equal to 85% and less than or equal to 97%, the actual charging current Imax = (D * 100 - 64) * 2.5 and is less than or equal to 63A.

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