Power-off control method and device of charger, charger, vehicle and medium

Abstract

The invention discloses a power-off control method and device of a charger, the charger, a vehicle and a medium, and relates to the technical field of charging. The method comprises the following steps: detecting an AC voltage through an AC voltage detection unit of the charger; determining a voltage value and a voltage change trend detected in the process of detecting the alternating voltage; and when it is detected that the charger meets a preset power-off triggering control condition, executing a power-off action according to the voltage value and the voltage change trend so as to stop alternating current input charging or alternating current output discharging. According to the invention, the voltage can be reduced below the safety voltage after the charger is powered off, and a bleeder resistor does not need to be added.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a power-off control method and device for a charger, a charger, a vehicle, and a medium. Background Art

[0002] The charger is a product of high-voltage and high-current power supply technology. In particular, on-board chargers require miniaturization, integration, and high power density. Because the national standard takes safety issues into consideration, the AC input capacitor in the charger needs to reduce the capacitor voltage to below the safe voltage within 1 second after power failure, otherwise people will be exposed to the residual voltage of the AC input capacitor and suffer high-voltage electric shock. The conventional design is to connect resistors in parallel at both ends of the AC input capacitor for discharge. For example, more than 20 resistors will be soldered on the PCB. The resistor can be a large chip resistor with a size of 1206 and a value of about 50 kilo-ohms. Such a design takes up the layout and wiring of high voltage and high current as well as the PCB copper plating space for heat dissipation, and also wastes material costs. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a power-off control method and device for a charger, a charger, a vehicle, a medium, and a product, which can reduce the voltage to a safe voltage after the charger is powered off without adding a discharge resistor.

[0004] To achieve the above object, a first aspect of an embodiment of the present application provides a power-off control method for a charger, the method comprising:

[0005] Detecting the AC voltage by an AC voltage detection unit of the charger;

[0006] Determining a voltage value and a voltage change trend detected during the detection of the AC voltage;

[0007] When it is detected that the charger meets the preset triggering power-off control condition, a power-off action is performed according to the voltage value and the voltage change trend to stop AC input charging or AC output discharging.

[0008] Optionally, when it is detected that the charger meets a preset triggering power-off control condition, a power-off action is performed according to the voltage value and the voltage change trend, including:

[0009] When it is detected that the charger meets a preset triggering power-off control condition, determining a comparison result between the voltage value and a voltage threshold, and determining a comparison result between the voltage change trend and a voltage drop trend;

[0010] If the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, a power-off action is performed.

[0011] Optionally, if the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, a power-off action is performed, including:

[0012] If the power-off triggering control condition satisfied by the charger is the charging power-off triggering control condition, and if the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, then a power-off instruction is generated;

[0013] The power-off instruction is sent to the charging gun through the communication interaction circuit between the charger and the charging gun, and the charging gun turns off the relay of the charging gun according to the power-off instruction to stop AC input charging;

[0014] If the trigger power-off control condition satisfied by the charger is the trigger discharge power-off control condition, and if the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, the circuit of the charger is turned off to stop the AC output discharge.

[0015] Optionally, before determining the comparison result between the voltage value and the voltage threshold and determining the comparison result between the voltage change trend and the voltage drop trend when detecting that the charger meets the preset triggering power-off control condition, the method further includes:

[0016] Determining a safe phase point according to the phase of a preset safe voltage in the AC voltage;

[0017] The safe phase point is updated according to the execution delay time to obtain a phase compensation point, wherein the execution delay time is used to characterize the time required to execute the power-off action;

[0018] The voltage of the phase compensation point in the AC voltage is used as the voltage threshold.

[0019] Optionally, updating the safe phase point according to the execution delay duration to obtain a phase compensation point includes:

[0020] Determine the duration of the AC voltage changing from a first safe phase point to a second safe phase point to obtain a valley phase change duration, wherein the first safe phase point is the safe phase point on one side of the valley of the AC voltage, and the second safe phase point is the safe phase point on the other side of the valley;

[0021] If the valley phase change duration is less than the execution delay duration, the first safe phase point is advanced to obtain the phase compensation point.

[0022] Optionally, if the valley phase change duration is less than the execution delay duration, the first safe phase point is advanced to obtain the phase compensation point, including:

[0023] If the valley phase change duration is less than the execution delay duration, a phase compensation value is calculated according to the execution delay duration;

[0024] The first safe phase point is advanced by the phase compensation value to obtain the phase compensation point.

[0025] Optionally, before updating the safe phase point according to the execution delay time to obtain the phase compensation point, the method further includes:

[0026] Collect the detection processing time corresponding to the AC voltage detection unit, collect the communication delay time of the power-off command transmitted to the relay of the charging gun, and collect the power-off execution time of the relay;

[0027] A first execution delay duration is obtained by summing the detection processing duration, the communication delay duration and the power-off execution duration;

[0028] Wherein, when the power-off control triggering condition satisfied by the charger is the charging power-off control triggering condition, the first execution delay time is determined as the execution delay time.

[0029] Optionally, before performing a power-off action according to the voltage value and the voltage change trend, the method further includes:

[0030] Detecting the AC current by the AC current detection unit of the charger;

[0031] If the AC current is less than a preset current threshold, a power-off action is triggered according to the voltage value and the voltage change trend.

[0032] To achieve the above-mentioned purpose, a second aspect of an embodiment of the present application provides a power-off control device for a charger, the device comprising:

[0033] A detection module, used for detecting AC voltage through an AC voltage detection unit of a charger;

[0034] A determination module, used to determine the voltage value and voltage change trend detected during the detection of the AC voltage;

[0035] The power-off module is used to execute a power-off action according to the voltage value and the voltage change trend to stop AC input charging or AC output discharging when it is detected that the charger meets a preset trigger power-off control condition.

[0036] To achieve the above objectives, the third aspect of an embodiment of the present application proposes a charger, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in the first aspect when executing the computer program.

[0037] To achieve the above-mentioned purpose, a fourth aspect of an embodiment of the present application proposes a vehicle, comprising the charger described in the third aspect above.

[0038] To achieve the above objectives, the fifth aspect of an embodiment of the present application proposes a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described in the first aspect is implemented.

[0039] To achieve the above-mentioned purpose, the sixth aspect of an embodiment of the present application proposes a computer program product, which includes a computer program. The computer program is read and executed by a processor, so that when the processor executes the computer program, the method described in the first aspect is implemented.

[0040] The power-off control method and device, charger, vehicle, storage medium, and program product proposed in the present application are aimed at the shortcomings of high power consumption and high cost caused by the need to connect resistors in parallel on both sides of the AC capacitor to reduce the capacitor voltage after power failure in the related technology. The present application first detects the AC voltage through the AC voltage detection unit of the charger, so that the AC voltage can be detected in time during the operation of the charger with the help of the original AC voltage detection unit of the charger. Further, the voltage value and voltage change trend detected in the process of detecting the AC voltage are determined, so that the voltage value and voltage change trend of the charger can be grasped in time. Further, when it is detected that the charger meets the preset trigger power-off control condition, the power-off action is performed according to the voltage value and the voltage change trend. In this way, even if the charger meets the preset trigger power-off control condition, the power-off action is not directly performed, but the voltage value and the voltage change trend are also taken into account, so that after the power-off action is performed, the voltage value and the voltage change trend of the charger are within the controllable range, reducing the probability of electric shock. In summary, the present application realizes effective control of the voltage value and voltage change trend of the AC voltage by utilizing the original AC voltage detection unit of the charger, and can reduce the voltage to below the safe voltage after the charger is powered off without adding a discharge resistor.

[0041] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a structural schematic diagram of a charger provided in an embodiment of the present application;

[0043] Figure 2 is a structural schematic diagram of an AC input filter circuit provided in an embodiment of the present application;

[0044] Figure 3 is a schematic diagram of the structure of a power factor correction circuit provided in an embodiment of the present application;

[0045] Figure 4 is a schematic diagram of the structure of a resonant power conversion circuit provided in an embodiment of the present application;

[0046] Figure 5 is a schematic structural diagram of a high-voltage DC filter circuit provided in an embodiment of the present application;

[0047] Figure 6 is a flow chart of a power-off control method for a charger provided in an embodiment of the present application;

[0048] Figure 7 is a schematic diagram of the AC voltage provided in the embodiment of the present application;

[0049] Figure 8 yes Figure 6 Flowchart of step 603;

[0050] Fig. 9 This is a flow chart of a power-off control method for a charger provided in another embodiment of the present application.

[0051] Fig.10 is another schematic diagram of the AC voltage provided in an embodiment of the present application;

[0052] Fig.11 yes Fig. 9 Flowchart of step 902;

[0053] Fig.12 It is a structural schematic diagram of a power-off control device for a charger provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0055] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0057] Before further describing the embodiments of the present application in detail, the nouns and terms involved in the embodiments of the present application are explained. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations.

[0058] Charger: The charger adopts high-frequency power supply technology and uses advanced intelligent dynamic adjustment charging technology. It adopts constant current / constant voltage / small constant current intelligent three-stage charging method, with high charging efficiency, simple operation, light weight and small size.

[0059] On-board charger: refers to a charger fixedly installed on an electric vehicle, which has the ability to safely and automatically charge the electric vehicle's power battery. The charger can dynamically adjust the charging current or voltage parameters based on the data provided by the battery management system (BMS), perform corresponding actions, and complete the charging process.

[0060] For safety reasons, the AC input capacitor voltage of the charger needs to be reduced to a voltage below the human safety voltage within 1 second after power is cut off. Otherwise, if a person touches the AC input contact, the residual voltage of the capacitor will cause high voltage electric shock. The conventional design is to connect resistors in parallel at both ends of the AC input capacitor for discharge. These resistors occupy the valuable layout and wiring of high voltage and high current as well as the PCB copper space for heat dissipation, which also wastes material costs.

[0061] Based on this, the embodiments of the present application provide a power-off control method and device for a charger, a charger, a vehicle, a storage medium, and a program product. By utilizing the original AC voltage detection unit of the charger, effective control of the voltage value and voltage change trend of the AC voltage can be achieved. After the charger is powered off, the voltage can be reduced to below a safe voltage without adding a discharge resistor.

[0062] It should be noted that the charger in the embodiment of the present application may be a vehicle-mounted charger or a charger for other purposes, and the present application does not make any specific limitation on this.

[0063] Reference Figure 1The charger includes an AC input filter circuit, a power factor correction circuit, a resonant power supply conversion circuit, a high-voltage DC filter circuit, an AC voltage detection unit, an AC circuit detection unit, a power tube drive unit, a power factor voltage detection unit, a power tube drive unit, a resonant current detection unit, a high-voltage DC current detection unit, a high-voltage DC voltage detection unit, a detection and drive processor, a digital isolator (Digital Isolator), a low-voltage control processor, and a communication interaction circuit. Wherein: one side of the AC input filter circuit is connected to the live wire L and the neutral wire N; the other side of the AC input filter circuit is connected to one side of the power factor correction circuit; the other side of the power factor correction circuit is connected to one side of the resonant voltage conversion circuit; the other side of the resonant voltage conversion circuit is connected to one side of the high-voltage DC filter circuit; the other side of the high-voltage DC filter circuit is connected to the high-voltage DC positive pole HVDC+ and the high-voltage DC negative pole HVDC-; the AC voltage detection unit is connected to the AC input filter circuit and the detection and drive processor; the AC voltage detection unit is connected to the AC input filter circuit and the detection and drive processor; the power tube drive unit is connected to the power factor correction circuit and the detection and drive processor; the power factor voltage detection unit is connected to the power factor correction circuit and the detection and drive processor; the power tube drive unit is connected to the resonant voltage conversion circuit and the detection and drive processor; the resonant current detection unit is connected to the resonant voltage conversion circuit and the detection and drive processor; the high-voltage DC current detection unit is connected to the high-voltage DC filter circuit and the detection and drive processor; the high-voltage DC voltage detection unit is connected to the high-voltage DC filter circuit and the detection and drive processor; the low-voltage control processor is connected to the detection and drive processor and the communication interaction circuit through a digital isolator. The charger communicates with the charging gun through a communication interaction circuit, such as sending a power-off command of the CC / CP charging protocol to the charging gun.

[0064] Power factor correction circuit (PFC), used for power conversion and ensuring that the equipment connected to the AC power grid does not have external harmonics and increase additional reactive load. Resonant power conversion circuit (LLC), used to convert the high-voltage bus DC isolation of the power factor correction circuit to high-voltage DC, and externally connect the battery pack. AC voltage detection circuit, used for control algorithm data acquisition of the power factor correction circuit, here to assist in determining the appropriate AC phase point to cut off the power. AC current detection circuit, used for control algorithm data acquisition of the power factor correction circuit, here to assist in determining whether it is close to the power-off state of charging / discharging. High-voltage DC output filter circuit (EMI), as a complete AC charging pile external high-voltage battery pack must filter circuit. High-voltage DC voltage detection circuit, used for control algorithm data acquisition of the resonant power conversion circuit. High-voltage DC current detection circuit, used for control algorithm data acquisition of the resonant power conversion circuit. MCU / DSP control unit circuit (including detection and drive processor, low-voltage control processor), used to control the charging or discharging of the entire charger and other circuit monitoring, communication, sleep and wake-up functions. For example, the detection and drive processor has the following functions: OBC PFC temperature detection, OBC LLC temperature detection and water temperature detection.

[0065] It should be noted that the detection and drive processor can be used for power factor correction (PFC) and resonant conversion (LLC), so the detection and drive processor is also called PFC&LLC MCU. The communication interaction circuit is used to communicate with the charging gun. The low-voltage control processor is also called the low-voltage control MCU. If the above charger is an on-board charger, the high-voltage power battery can be connected through the high-voltage DC positive pole HVDC+ and the high-voltage DC negative pole HVDC-. A digital isolator is an electronic component used in a circuit that provides electrical isolation between one circuit and another while allowing signal transmission.

[0066] Reference Figure 1 The charger also includes a 12V battery, a power step-down unit, a CAN transceiver unit, a charger wake-up unit, an electronic lock control unit, an AC input line temperature detection unit, a vehicle controller and a battery management system (VCU&BMS). Among them, the power step-down unit is connected to the 12V battery and the low-voltage control processor; the CAN transceiver unit is connected to the vehicle controller and the battery management system, and the low-voltage control processor; the charger wake-up unit is connected to the vehicle controller and the battery management system, and the low-voltage control processor; the electronic lock control unit is connected to the vehicle controller and the battery management system, and the low-voltage control processor; the AC input line temperature detection unit is connected to the low-voltage control processor.

[0067] Reference Figure 2The AC input filter circuit includes a first capacitor C1, a first common-mode inductor L1, a switch K1, a first variable resistor RV1, a second variable resistor RV2, a third variable resistor RV3, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a second common-mode inductor L2, a fifth capacitor C5, a first resistor R1, a sixth capacitor C6, a seventh capacitor C7, a third common-mode inductor L3, an eighth capacitor C8, a second resistor R2, a third resistor R3, a fourth resistor R4, a ninth capacitor C9, a sixth resistor R6, a tenth capacitor C10 and an eleventh capacitor C11. Wherein: one end of the first capacitor C1 is connected to the live wire L, and the other end is connected to the neutral wire N; the first capacitor C1 is connected in parallel with the first common mode inductor L1; one end of the first common mode inductor L1 is connected in series with one end of the switch K1; the other end of the switch K1 is connected to one end of the first variable resistor RV1 and one end of the third variable resistor, the other end of the first variable resistor RV1 is connected to one end of the second variable resistor RV2 and is grounded, and the other end of the second variable resistor RV2 is connected to the other end of the first common mode inductor L1 and the other end of the third variable resistor RV3; the second capacitor C2 is connected in parallel with the third variable resistor RV3; one end of the third variable resistor RV3 is connected to one end of the third capacitor C3 and one end of the second common mode inductor L2; the other end of the third capacitor C3 is connected to one end of the fourth capacitor C4 and is grounded; the other end of the fourth capacitor C4 is connected to the other end of the second capacitor and the other end of the second common mode inductor L2; the fifth capacitor C5 is connected in parallel with the second common mode inductor L2; one end of the fifth capacitor C5 is connected to one end of the first resistor R1, one end of the sixth capacitor C6 end and one end of the third common-mode inductor; the other end of the sixth capacitor C6 is connected to one end of the seventh capacitor C7 and is grounded; the other end of the fifth capacitor C5 is connected to the other end of the first resistor R1, the other end of the seventh capacitor C7 and the other end of the third common-mode inductor L3; the eighth capacitor C8 is connected in parallel with the third common-mode inductor L3; one end of the eighth capacitor C8 is connected to one end of the second resistor R2, one end of the fourth resistor R4, one end of the ninth capacitor C9 and one end of the tenth capacitor C10; the other end of the eighth capacitor C8 is connected to the other end of the ninth capacitor C9 and one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected to one end of the eleventh capacitor C11; the other end of the eleventh capacitor C11 is connected to the other end of the tenth capacitor C10 and is grounded; the other end of the second resistor R2 is connected to one end of the third resistor and the AC voltage detection unit; the other end of the third resistor R3 is connected to one end of the fifth resistor R5; the other end of the fifth resistor R5 is connected to the other end of the fourth resistor R4 and the AC voltage detection unit; the sixth resistor R6 is also connected to the AC current detection unit. One end of the tenth capacitor C10 and one end of the eleventh capacitor C11 are connected to the power factor correction circuit.

[0068] It should be noted that when applying the power-off control method of the charger provided in the embodiment of the present application, there is no need to set the first resistor R1 as a discharge resistor in the AC filter input circuit. The voltage can also be reduced to below the safe voltage after the charger is powered off. The specific process is described in detail below.

[0069] Reference Figure 3 The power factor correction circuit includes a fourth inductor L4, a first power tube Q1, a second power tube Q2, a third power tube Q3, a fourth power tube Q4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a twelfth capacitor C12. The connection point between the seventh resistor R7 and the eighth resistor R8, and the connection point between the ninth resistor R9 and the tenth resistor R10 are connected to the power factor voltage detection unit. One end of the tenth capacitor C10 is connected to the fourth inductor L4, and one end of the eleventh capacitor C11 is connected to the connection point between the third power tube Q3 and the fourth power tube Q4. The connection relationship between the various components in the power factor correction circuit is as shown in FIG. Figure 3 As shown, no further description is given here.

[0070] Reference Figure 4 The resonant power conversion circuit includes a fifth power tube Q5, a sixth power tube Q6, a seventh power tube Q7, an eighth power tube Q8, a fifth inductor L5, a sixth common mode inductor L6, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a first transformer T1, a second transformer T2, a ninth power tube Q9, a tenth power tube Q10, an eleventh power tube Q11, a twelfth power tube Q12, and a sixteenth capacitor. Both ends of the second transformer T2 are connected to the resonant current detection unit. One end of the twelfth capacitor C12 is connected to one end of the fifth power tube Q5, the other end of the fifth power tube Q5 is connected to one end of the sixth power tube, and the other end of the sixth power tube is connected to the other end of the twelfth capacitor. The connection relationship of each component in the resonant power conversion circuit is as shown in FIG. Figure 4 As shown, no further description is given here.

[0071] Reference Figure 5The high-voltage DC filter circuit includes a seventh inductor L7, a seventeenth capacitor C17, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, an eighteenth capacitor C18, a nineteenth capacitor C19, an eighth common-mode inductor L8, a ninth common-mode inductor L9, a twentieth capacitor C20, a twenty-first capacitor C21, and a twenty-second capacitor C22. One end of the twenty-first capacitor C21 is connected to the high-voltage DC positive electrode HVDC+, one end of the twenty-second capacitor C22 is connected to the high-voltage DC negative electrode HVDC-, and the other end of the twenty-first capacitor C21 is connected to the other end of the twenty-second capacitor C22 and grounded. One end of the sixteenth capacitor C16 is connected to one end of the seventh inductor L7, the other end of the seventh inductor L7 is connected to one end of the seventeenth capacitor C17, the other end of the seventeenth capacitor C17 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the other end of the sixteenth capacitor C16. The eleventh resistor R11 is connected to the high-voltage DC current detection unit; the connection point between the thirteenth resistor R13 and the fourteenth resistor R14 is connected to the high-voltage DC voltage detection unit. The connection relationship of each component in the high-voltage DC filter circuit is as follows: Figure 5 As shown, no further description is given here.

[0072] Please refer to Figure 6 , Figure 6 An optional flow chart of a method for controlling power failure of a charger is disclosed. Figure 1 The low voltage control processor shown is executed. Figure 6 The method may include but is not limited to steps 601 to 603.

[0073] Step 601, detecting AC voltage by an AC voltage detection unit of a charger;

[0074] Step 602, determining the voltage value and voltage change trend detected during the detection of the AC voltage;

[0075] Step 603, when it is detected that the charger meets the preset triggering power-off control condition, a power-off action is executed according to the voltage value and the voltage change trend to stop AC input charging or AC output discharging.

[0076] Steps 601 to 603 shown in the embodiment of the present application, in view of the disadvantages of high power consumption and high cost caused by the need to connect resistors in parallel on both sides of the AC capacitor to reduce the capacitor voltage after power failure in the related art, the present application first detects the AC voltage through the AC voltage detection unit of the charger, so that the AC voltage can be detected in time during the operation of the charger with the help of the original AC voltage detection unit of the charger. Further, the voltage value and voltage change trend detected in the process of detecting the AC voltage are determined, so that the voltage value and voltage change trend of the charger can be grasped in time. Further, when it is detected that the charger meets the preset trigger power failure control condition, the power failure action is performed according to the voltage value and voltage change trend. In this way, even if the charger meets the preset trigger power failure control condition, the power failure action is not directly performed, but the voltage value and voltage change trend must be taken into account, so that after the power failure action is performed, the voltage value and voltage change trend of the charger are within the controllable range, reducing the probability of electric shock. In summary, the present application utilizes the original AC voltage detection unit of the charger to achieve effective control of the voltage value and voltage change trend of the AC voltage, and can reduce the voltage to below the safe voltage after the charger is powered off without adding a discharge resistor.

[0077] In step 601, the charger is started, and the low-voltage control processor communicates with the charging gun (not shown) through the communication interaction circuit, and detects the voltage, current and temperature of the charger. The charger has two working states, namely, the AC input charging state and the AC output discharging state. Whether it is the AC input charging state or the AC output discharging state, the AC voltage detection unit will detect the AC voltage and transmit it to the low-voltage control processor through the detection and drive processor.

[0078] It should be noted that when the charger is in AC input charging state, the electronic lock of the charging gun is locked.

[0079] In step 602, the low voltage control processor determines the voltage value and voltage change trend detected during the detection of the AC voltage. The voltage change trend refers to the change trend of the voltage value. For example, if the voltage value continues to increase, the voltage change trend is a voltage rising trend. For another example, if the voltage value continues to decrease, the voltage change trend is a voltage falling trend.

[0080] like Figure 7 As shown in the figure, the amplitude of the AC voltage changes periodically with the increase of time. Specifically, the charging gun is connected to the live wire L and the neutral wire N. When the charger is in AC input charging, the neutral wire N is the neutral wire, which is at the same potential as the earth PE wire under normal circumstances. The product shell and the neutral wire N are also at the same potential, which is 0V, which is safe for human body. Figure 7 As shown, the voltage difference between the live line L and the neutral line N is in the form of a sine wave with an amplitude shifted upward, and the voltage difference swings periodically between 0V and 622V. Figure 7 The black dashed line shown is a safe DC voltage, which is 60 V. The AC voltage is as follows:

[0081]

[0082] Among them, V L (t) is the AC voltage detected by the AC voltage detection unit, the unit is V, and t is the detection time, the unit of t is seconds.

[0083] In step 603, the triggering power-off control condition refers to the condition that triggers the charger to start the power-off control. For example, when the triggering power-off control condition is the triggering charging power-off control condition, it may include conditions such as the BMS is fully charged or an external command is received. For another example, when the triggering power-off control condition is the triggering discharge power-off control condition, it may include conditions such as the discharge current is zero and the relay of the charging gun has been turned off. When it is detected that the charger meets the preset triggering power-off control condition, the power-off action is not directly performed, but the power-off action is performed according to the voltage value and the voltage change trend to stop the AC input charging or the AC output discharging.

[0084] In one embodiment, step 603 may include:

[0085] When it is detected that the charger meets the preset triggering power-off control condition, the AC current is detected by the AC current detection unit of the charger;

[0086] If the AC current is less than the preset current threshold, a power-off action is performed according to the voltage value and the voltage change trend to stop AC input charging or AC output discharging.

[0087] Specifically, the preset current threshold can be set according to actual needs, such as zero. The benefit of this embodiment is that before determining whether to perform a power-off action according to the AC voltage, it is ensured that the AC current is less than a certain threshold, which further improves safety.

[0088] In one embodiment, referring to Figure 8 , step 603 includes:

[0089] Step 801, when it is detected that the charger meets the preset triggering power-off control condition, determining the comparison result between the voltage value and the voltage threshold, and determining the comparison result between the voltage change trend and the voltage drop trend;

[0090] Step 802: If the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, a power-off action is executed.

[0091] For example, refer to Figure 8, as long as the power is off, select a voltage range where the voltage value is below the voltage threshold (such as 60V) and the voltage change trend is a voltage decrease trend, such as Figure 7 When the power-off action is performed at point A, there will be no residual charge higher than the human body voltage in the AC input capacitor of the AC input filter circuit, and there is no need for a passive discharge resistor.

[0092] It should be noted that, assuming that the charger meets the preset triggering power-off control condition, it occurs at any point in a random sine cycle and is uniformly distributed, then the worst case is Figure 7 Point B needs to wait nearly half a cycle to reach point A of the next cycle, that is, 0.5*1 / (50Hz)=10ms. Relevant regulations stipulate that the charging gun completes the action 100ms after receiving the power-off command. Therefore, this method only delays the power-off by up to 10ms compared to the action after receiving the command, which is less than 100ms and can meet the standard requirements.

[0093] The benefit of the above embodiment is that by performing a power-off action when the voltage value is less than the voltage threshold and the voltage change trend is a voltage decreasing trend, the success rate of leaving no residual charge higher than the human body voltage after power off is increased, thereby improving the safety of electricity use.

[0094] In one embodiment, after step 801, step 603 also includes: if the comparison result is that the voltage value is greater than or equal to the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, then return to step 602; if the comparison result is that the voltage value is greater than or equal to the voltage threshold and the comparison result indicates that the voltage change trend is a voltage increasing trend, then return to step 602; if the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage increasing trend, then return to step 602.

[0095] In one embodiment, step 802 includes:

[0096] If the triggering power-off control condition satisfied by the charger is the triggering charging power-off control condition, and if the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, a power-off instruction is generated;

[0097] The power-off command is sent to the charging gun through the communication interaction circuit between the charger and the charging gun, and the charging gun turns off the relay of the charging gun according to the power-off command to stop AC input charging.

[0098] For example, refer to Figure 1, the low-voltage control processor generates a power-off instruction when the trigger power-off control condition satisfied by the charger is the trigger charging power-off control condition, and if the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend. The low-voltage control processor sends the power-off instruction to the charging gun through the communication interaction circuit. The charging gun turns off the relay of the charging gun according to the power-off instruction to stop the input of AC power from the charging gun to the live wire L and the neutral wire N of the charger, thereby stopping AC input charging.

[0099] In one embodiment, after the low voltage control processor sends the power-off instruction to the charging gun, it generates a first shutdown instruction and / or a second shutdown instruction, and sends the first shutdown instruction and / or the second shutdown instruction to the detection and drive processor. The detection and drive processor turns off the power factor correction circuit according to the first shutdown instruction. The detection and drive processor turns off the resonant voltage conversion circuit according to the second shutdown instruction. After stopping the AC input charging, the electronic lock of the charging gun is opened.

[0100] In one embodiment, step 802 also includes: if the trigger power-off control condition satisfied by the charger is a trigger discharge power-off control condition, and if the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, then the circuit of the charger is turned off to stop the AC output discharge.

[0101] Shutting down the charger circuit specifically refers to shutting down the charger's current loop, such as shutting down the charger's power factor correction circuit, the charger's resonant power conversion circuit, and the charger's relay.

[0102] Regarding the relay of the charger, one end of the relay is connected to the connection point between the second capacitor C2 and the live wire L, and the other end of the relay is connected to the connection point between the third capacitor C3 and the live wire L.

[0103] It should be noted that the charger relay specifically refers to the AC input / output relay inside the charger. When the charger is in AC output discharge, the AC input port of the charger is not connected to the charging gun. Generally, a discharge gun or a discharge adapter is plugged into the AC charging port, and then connected to an external electrical load. When the user uses an external electrical load, they will directly turn on or off or plug in and unplug the electrical plug. In this case, the power outage causes the relay inside the charger to be actively turned off.

[0104] The above step 802 specifically includes: the low-voltage control processor generates a first shutdown instruction, or generates a first shutdown instruction and a second shutdown instruction, and sends the first shutdown instruction, or sends the first shutdown instruction and the second shutdown instruction to the detection and drive processor when the trigger power-off control condition satisfied by the charger is a trigger discharge power-off control condition, and the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decrease trend. The detection and drive processor turns off the power factor correction circuit according to the first shutdown instruction. The detection and drive processor turns off the resonant voltage conversion circuit according to the second shutdown instruction.

[0105] In one embodiment, the voltage threshold in step 801 is set according to actual needs, such as DC 60V, DC 55V, DC 50V, etc.

[0106] In one embodiment, referring to Fig. 9 Before step 801, the power-off control method of the charger provided in this embodiment may further include:

[0107] Step 901, determining a safe phase point according to the phase of a preset safe voltage in the AC voltage;

[0108] Step 902, updating the safe phase point according to the execution delay time to obtain a phase compensation point;

[0109] Step 903: taking the voltage of the phase compensation point in the AC voltage as a voltage threshold.

[0110] In step 901, the safety voltage may be 60V DC or within 60V DC. Figure 7 , assuming the safety voltage is 60V DC, the safety phase point is the phase where the safety voltage is 60V in the AC voltage, such as point A and point B. When the power is cut off, it is necessary to ensure that the voltage change trend is a voltage decrease trend, so the power-off action will be performed only at point A.

[0111] In step 902, the execution delay duration is used to characterize the time required to execute the power-off action. If the low-voltage control processor can instantly cut off the power after determining to execute the power-off action based on the voltage value and the voltage change trend, for example, if it is determined at point A that the power-off action can be instantly cut off, then the execution delay duration is zero, but in fact the execution delay duration is greater than zero. If the execution delay duration is not considered, after the power-off action is determined to be executed at point A, the power may be cut off after point B. At this time, the voltage in the charger is greater than the safety voltage, which can easily cause electric shock to the human body. Therefore, the safety phase point is updated according to the execution delay duration to obtain the phase compensation point so that the voltage of the charger is less than the safety voltage after the power-off action is executed.

[0112] In one embodiment, before step 902, the power-off control method of the charger provided in this embodiment may further include:

[0113] Collect the detection processing time corresponding to the AC voltage detection unit, collect the communication delay time of the power-off command transmitted to the relay of the charging gun, and collect the power-off execution time of the relay;

[0114] The first execution delay duration is obtained by summing the detection processing duration, the communication delay duration and the power failure execution duration;

[0115] When the power-off control triggering condition satisfied by the charger is the charging power-off control triggering condition, the first execution delay time is determined as the execution delay time.

[0116] Specifically, when the power is cut off, the relay of the charging gun also needs a few milliseconds of power-off execution time. In addition, there is a communication delay from the charger sending the power-off command to the charging gun starting to execute. The AC voltage detection unit also needs some detection processing time for collection, processing and calculation. The sum of these times is recorded as the first execution delay time t delay1 The first execution delay time t delay1 If it is greater than the valley phase change duration, the voltage phase will actually run to a position beyond the human safety voltage of more than 60V DC after the power outage ends.

[0117] The above-mentioned embodiment can fully consider the influence of the AC voltage detection unit and the charging gun on the execution delay duration, thereby improving the accuracy of determining the execution delay duration.

[0118] In one embodiment, before step 902, the power-off control method of the charger provided in this embodiment may also include: obtaining a first execution delay duration, determining a duration less than the first execution delay duration, and obtaining a second execution delay duration; wherein, when the triggering power-off control condition satisfied by the charger is a triggering discharge power-off control condition, the second execution delay duration is determined as the execution delay duration.

[0119] Specifically, it is slightly different from AC input charging. When the discharge power-off control condition is triggered, the charger itself executes the shutdown circuit, such as shutting down the resonant power conversion circuit, the resonant power conversion circuit and the output relay. There is no communication delay, and the execution delay of the advance compensation will be shorter than the previous charging power-off situation.

[0120] In one embodiment, referring to Fig.11 , step 902 may include:

[0121] Step 1101, determining the duration of the AC voltage changing from a first safe phase point to a second safe phase point, and obtaining the valley phase change duration;

[0122] Step 1102: If the valley phase change duration is less than the execution delay duration, the first safe phase point is advanced to obtain a phase compensation point.

[0123] In step 1101, the first safe phase point is a safe phase point on one side of the trough of the AC voltage, and the second safe phase point is a safe phase point on the other side of the trough. Figure 7 or Fig.10 , the first safe phase point is point A, and the second safe phase point is point B. The valley phase change duration = the detection time of point B - the detection time of point A. Assuming that the detection time of point B is = 0.01799 seconds, and the detection time of point A is 0.01201, the valley phase change duration is 0.00598 seconds.

[0124] In step 1102, if the valley phase change duration is less than the execution delay duration, the phase after the power-off action is executed may not be between the first safe phase point and the first safe phase point. Fig.10 , point A needs to be advanced to obtain the phase compensation point as point C. For example, if the phase detected in real time is point C, the power-off action is performed to shut down the AC output discharge, otherwise the power-off action is performed when the next AC cycle is at point C to shut down the AC output discharge.

[0125] The benefit of the above-mentioned embodiment of steps 1101 to 1102 is that when considering updating the safe phase point according to the execution delay duration, the relationship between the execution delay duration and the valley phase change duration is fully considered to achieve accurate updating.

[0126] In one embodiment, after step 1101, if the valley phase change duration is greater than or equal to the execution delay duration, the first safe phase point is determined as the phase compensation point.

[0127] In one embodiment, step 1102 may include:

[0128] If the valley phase change duration is less than the execution delay duration, the phase compensation value is calculated based on the execution delay duration;

[0129] The first safe phase point is advanced by the phase compensation value to obtain a phase compensation point.

[0130] For example, if the execution delay time is 0.006 seconds, the phase difference value is 100*π*0.006=0.6π. The first safe phase point is advanced by 0.6π to obtain a phase compensation point.

[0131] The benefit of the above embodiment is that it can ensure to the greatest extent that after the power-off action is performed at the phase compensation point, the phase when the power-off is completed is between the first safe phase point and the second safe phase point, thereby improving safety.

[0132] In step 903, the voltage at the phase compensation point in the AC voltage is used as a voltage threshold. Fig.10 , the voltage at point C in the AC voltage is 400V, then the voltage threshold is 400V.

[0133] In one example, when the load of the AC output discharge (also called inverter external discharge) is removed, the AC current is zero and can be expressed as follows: Figure 1 The AC current detection unit shown in the figure detects. At this time, the charger may not immediately shut down the PFC circuit output, but wait until the voltage value of the live line L and the neutral line N of the AC output discharge is just lower than the voltage threshold after the compensation execution delay time, and the voltage is just falling. Fig.10 The power-off action is performed only when the power reaches point C.

[0134] In one embodiment, after the power-off action is executed, if the voltage value of the charger is greater than the safety voltage, the power-off abnormality can be prompted by a light-emitting diode, one end of which is connected to the live wire L, and the other end is connected to one end of the current-limiting resistor, and the other end of the current-limiting resistor is connected to the neutral wire N. For example, the current-limiting resistor can be a resistor of 400V / 20mA=20kΩ. In this way, the user can be reminded of the power-off abnormality and reduce the risk of electric shock.

[0135] In one embodiment, if the low-voltage control processor detects a power failure anomaly, the AC input filter circuit is discharged through the DC voltage step-down circuit of the charger, one end of the DC voltage step-down circuit is connected to the output end of the high-voltage DC filter circuit, and the other end is connected to the low-voltage control processor, and the low-voltage 12V battery (battery) supplies power to the low-voltage control processing circuit. In this way, even if a power failure anomaly occurs, the power can be discharged in time to ensure safety.

[0136] The various technical features in the above embodiments can be arbitrarily combined as long as there is no conflict or contradiction between the combinations of features. However, due to space limitations, they are not described one by one. Therefore, any combination of the various technical features in the above embodiments also falls within the scope of this specification.

[0137] The present application also discloses a power-off control device for a charger, referring to Fig.12 The power-off control device of the charger includes: a detection module 1201, a determination module 1202 and a power-off module 1203. The detection module 1201 is used to detect the AC voltage through the AC voltage detection unit of the charger; the determination module 1202 is used to determine the voltage value and the voltage change trend detected in the process of detecting the AC voltage; the power-off module 1203 is used to perform a power-off action according to the voltage value and the voltage change trend when it is detected that the charger meets the preset triggering power-off control condition, so as to stop the AC input charging or AC output discharging.

[0138] In one embodiment, the power-off control device of the charger may further include: a voltage threshold setting module, which is used to: determine the safe phase point according to the phase of the preset safety voltage in the AC voltage; update the safe phase point according to the execution delay time to obtain the phase compensation point, wherein the execution delay time is used to characterize the time required to execute the power-off action; and use the voltage of the phase compensation point in the AC voltage as the voltage threshold.

[0139] In one embodiment, the power-off control device of the charger may further include: a duration compensation module, which is used to: collect the detection processing duration corresponding to the AC voltage detection unit, collect the communication delay duration of the power-off command transmitted to the relay of the charging gun, and collect the power-off execution duration of the relay; sum the detection processing duration, communication delay duration and power-off execution duration to obtain a first execution delay duration; wherein, when the triggering power-off control condition satisfied by the charger is the triggering charging power-off control condition, the first execution delay duration is determined as the execution delay duration.

[0140] In one embodiment, the power-off module 1203 is used to detect the AC current through the AC current detection unit of the charger when it is detected that the charger meets the preset trigger power-off control conditions; if the AC current is less than the preset current threshold, the power-off action is performed according to the voltage value and the voltage change trend to stop AC input charging or AC output discharging.

[0141] It should be noted that the specific implementation of the power-off control device of the charger is basically the same as the specific implementation of the power-off control method of the charger mentioned above, and will not be repeated here.

[0142] An embodiment of the present application further discloses a charger, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the charger power-off control method described above is implemented.

[0143] The embodiment of the present application also discloses a vehicle, including the charger as described above. The vehicle may be a new energy vehicle, such as a hybrid vehicle or a pure electric vehicle. For example, the vehicle may be a sedan, SUV, MPV, pickup truck, van, bus, etc.

[0144] An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the power-off control method of the charger as described above is implemented.

[0145] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0146] An embodiment of the present application also provides a computer program product, which includes a computer program. The computer program is read and executed by a processor, so that when the processor executes the computer program, the power-off control method of the charger as described above is implemented.

[0147] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0148] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0149] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0150] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0151] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0152] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0153] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0154] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0155] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0156] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including multiple instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store programs.

[0157] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A power-off control method for a charger, characterized in that: The method comprises: Detecting the AC voltage by an AC voltage detection unit of the charger; Determining a voltage value and a voltage change trend detected during the detection of the AC voltage; When it is detected that the charger meets the preset triggering power-off control condition, a power-off action is performed according to the voltage value and the voltage change trend to stop AC input charging or AC output discharging.

2. The method according to claim 1, characterized in that When it is detected that the charger meets the preset triggering power-off control condition, a power-off action is performed according to the voltage value and the voltage change trend, including: When it is detected that the charger meets a preset triggering power-off control condition, determining a comparison result between the voltage value and a voltage threshold, and determining a comparison result between the voltage change trend and a voltage drop trend; If the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, a power-off action is performed.

3. The method according to claim 2, characterized in that If the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, a power-off action is executed, including: If the power-off triggering control condition satisfied by the charger is the charging power-off triggering control condition, and if the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, then a power-off instruction is generated; The power-off instruction is sent to the charging gun through the communication interaction circuit between the charger and the charging gun, and the charging gun turns off the relay of the charging gun according to the power-off instruction to stop AC input charging; If the trigger power-off control condition satisfied by the charger is the trigger discharge power-off control condition, and if the comparison result is that the voltage value is less than the voltage threshold and the comparison result indicates that the voltage change trend is a voltage decreasing trend, the circuit of the charger is turned off to stop the AC output discharge.

4. The method according to claim 2, characterized in that: Before determining the comparison result between the voltage value and the voltage threshold, and determining the comparison result between the voltage change trend and the voltage drop trend, the method further includes: Determining a safe phase point according to the phase of a preset safe voltage in the AC voltage; The safe phase point is updated according to the execution delay time to obtain a phase compensation point, wherein the execution delay time is used to characterize the time required to execute the power-off action; The voltage of the phase compensation point in the AC voltage is used as the voltage threshold.

5. The method according to claim 4, characterized in that The updating of the safe phase point according to the execution delay time to obtain the phase compensation point includes: Determine the duration of the AC voltage changing from a first safe phase point to a second safe phase point to obtain a valley phase change duration, wherein the first safe phase point is the safe phase point on one side of the valley of the AC voltage, and the second safe phase point is the safe phase point on the other side of the valley; If the valley phase change duration is less than the execution delay duration, the first safe phase point is advanced to obtain the phase compensation point.

6. The method according to claim 5, characterized in that If the valley phase change duration is less than the execution delay duration, the first safe phase point is advanced to obtain the phase compensation point, including: If the valley phase change duration is less than the execution delay duration, a phase compensation value is calculated according to the execution delay duration; The first safe phase point is advanced by the phase compensation value to obtain the phase compensation point.

7. The method according to claim 4, characterized in that Before updating the safe phase point according to the execution delay time to obtain the phase compensation point, the method further includes: Collect the detection processing time corresponding to the AC voltage detection unit, collect the communication delay time of the power-off command transmitted to the relay of the charging gun, and collect the power-off execution time of the relay; A first execution delay duration is obtained by summing the detection processing duration, the communication delay duration and the power-off execution duration; Wherein, when the power-off control triggering condition satisfied by the charger is the charging power-off control triggering condition, the first execution delay time is determined as the execution delay time.

8. The method according to any one of claims 1 to 7, characterized in that: Before performing a power-off action according to the voltage value and the voltage change trend, the method further includes: Detecting the AC current by the AC current detection unit of the charger; If the AC current is less than a preset current threshold, a power-off action is triggered according to the voltage value and the voltage change trend.

9. A power-off control device for a charger, characterized in that: The device comprises: A detection module, used for detecting AC voltage through an AC voltage detection unit of a charger; A determination module, used to determine the voltage value and voltage change trend detected during the detection of the AC voltage; The power-off module is used to execute a power-off action according to the voltage value and the voltage change trend to stop AC input charging or AC output discharging when it is detected that the charger meets a preset trigger power-off control condition.

10. A charger, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 8 when executing the computer program.

11. A vehicle, characterized in that: It comprises the charger as claimed in claim 10.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 8 is implemented.

13. A computer program product, characterized in that The computer program product comprises a computer program, and the computer program is read and executed by a processor, so that when the processor executes the computer program, the method according to any one of claims 1 to 8 is implemented.

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