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

Abstract

The application 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 alternating voltage through an alternating 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 in the case that it is detected that the charger meets a preset trigger power-off control condition, performing 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. The application can reduce the voltage to below a safe voltage after the power-off of the charger, and does not need to increase a discharge resistor.

Description

Technical Field

[0001] This 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 Technology

[0002] A charger is a product using high-voltage, high-current power technology. On-board chargers, in particular, require miniaturization, integration, and high power density. Due to safety concerns in national standards, the AC input capacitor in a charger must have its voltage reduced to below a safe level within one second after power is cut off; otherwise, contact with the residual voltage of the AC input capacitor could cause electric shock. The conventional design involves connecting a resistor in parallel across the AC input capacitor for discharge, typically using about 20 surface-mount resistors (1206mm, approximately 50kΩ) soldered onto the PCB. This design consumes valuable PCB copper space for high-voltage, high-current layout, wiring, and heat dissipation, resulting in wasted material costs. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this 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 below a safe voltage after the charger is powered off, without the need to add a bleeder resistor.

[0004] To achieve the above objectives, a first aspect of this application provides a power-off control method for a charger, the method comprising:

[0005] The AC voltage is detected by the AC voltage detection unit of the charger;

[0006] Determine the voltage value and voltage change trend detected during the AC voltage detection process;

[0007] When the charger is detected to meet the preset trigger power-off control conditions, 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 the charger is detected to meet a preset trigger power-off control condition, a power-off action is performed based on the voltage value and the voltage change trend, including:

[0009] When the charger is detected to meet the preset trigger power-off control conditions, the comparison result between the voltage value and the voltage threshold is determined, and the comparison result between the voltage change trend and the voltage decrease trend is determined.

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

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

[0012] If the charger meets the trigger 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 decrease trend, then a power-off command is generated.

[0013] The power-off command is sent to the charging gun through the communication circuit between the charger and the charging gun. The charging gun then shuts off its relay according to the power-off command to stop AC input charging.

[0014] If the charger meets the trigger power-off control condition, which 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 decrease trend, then the charger circuit 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 the comparison result between the voltage change trend and the voltage decrease trend, when the charger is detected to meet the preset trigger power-off control conditions, the method further includes:

[0016] The safe phase point is determined based on the phase of the preset safe voltage in the AC voltage;

[0017] The safety phase point is updated based on the execution delay duration to obtain the phase compensation point, wherein the execution delay duration is used to characterize the required duration for executing the power-off action;

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

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

[0020] The duration of the AC voltage change from the first safe phase point to the second safe phase point is determined to obtain the 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, then the phase compensation value is calculated based on 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 duration to obtain the phase compensation point, the method further includes:

[0026] The detection processing time of the AC voltage detection unit, the communication delay time of the relay transmitting the power-off command to the charging gun, and the power-off execution time of the relay are collected.

[0027] The first execution delay duration is obtained by summing the detection processing duration, the communication delay duration, and the power outage execution duration.

[0028] Wherein, when the power-off control condition met by the charger is the power-off control condition for charging, the first execution delay duration is determined as the execution delay duration.

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

[0030] The AC current is detected by the AC current detection unit of the charger;

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

[0032] To achieve the above objectives, a second aspect of this application provides a power-off control device for a charger, the device comprising:

[0033] The detection module is used to detect AC voltage through the AC voltage detection unit of the charger;

[0034] The determination module is 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 perform a power-off action based on the voltage value and the voltage change trend when the charger is detected to meet the preset trigger power-off control conditions, so as to stop AC input charging or AC output discharging.

[0036] To achieve the above objectives, a third aspect of the present application provides a charger, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in the first aspect.

[0037] To achieve the above objectives, a fourth aspect of the present application provides a vehicle that includes the charger described in the third aspect.

[0038] To achieve the above objectives, a fifth aspect of the present application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described in the first aspect.

[0039] To achieve the above objectives, a sixth aspect of the present application provides a computer program product comprising a computer program that is read and executed by a processor, such that the processor executes the computer program to implement the method described in the first aspect.

[0040] This application proposes a power-off control method and device for a charger, as well as a charger, vehicle, storage medium, and program product. Addressing the drawbacks of related technologies that require parallel resistors across an AC capacitor to reduce capacitor voltage after power failure, resulting in high power consumption and cost, this application first detects the AC voltage using the charger's existing AC voltage detection unit. This allows for timely detection of the AC voltage during charger operation. Furthermore, it determines the detected voltage value and voltage change trend during AC voltage detection, enabling timely monitoring of the charger's voltage value and trend. Moreover, when the charger meets preset trigger power-off control conditions, a power-off action is executed based on the voltage value and voltage change trend. Thus, even when the charger meets the preset trigger power-off control conditions, a direct power-off action is not performed; instead, the voltage value and voltage change trend are considered to ensure that the charger's voltage value and voltage change trend remain within a controllable range after the power-off action, reducing the probability of electric shock. In summary, this application utilizes the charger's existing AC voltage detection unit to effectively control the AC voltage value and voltage change trend, enabling the voltage to be reduced to below a safe voltage after the charger is powered off, without the need to add a bleed resistor.

[0041] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the charger provided in the embodiments of this application;

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

[0044] Figure 3 This is a schematic diagram of the power factor correction circuit provided in the embodiments of this application;

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

[0046] Figure 5 This is a schematic diagram of the high-voltage DC filter circuit provided in the embodiments of this application;

[0047] Figure 6 This is a flowchart of the power-off control method for the charger provided in the embodiments of this application;

[0048] Figure 7 This is a schematic diagram of an AC voltage provided in an embodiment of this application;

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

[0050] Figure 9 This is a flowchart of a power-off control method for a charger provided in another embodiment of this application.

[0051] Figure 10 This is another schematic diagram of the AC voltage provided in the embodiments of this application;

[0052] Figure 11 yes Figure 9 Flowchart for step 902;

[0053] Figure 12 This is a schematic diagram of the power-off control device for the charger provided in the embodiments of this application. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0055] It should be noted that although functional modules are divided in the device schematic diagram and a 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 aforementioned 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 commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0057] Before providing a further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application will be explained, and the nouns and terms involved in the embodiments of this application shall be interpreted as follows.

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

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

[0060] For safety reasons, the voltage of the AC input capacitor in the charger needs to drop below the safe voltage for the human body within one second after power is cut off. Otherwise, if a person touches the AC input contacts, the residual voltage in the capacitor could cause a high-voltage electric shock. Conventional designs use resistors connected in parallel across the AC input capacitor for discharge. These resistors occupy valuable space in the high-voltage, high-current layout and wiring, as well as the copper plating for heat dissipation on the PCB, wasting material costs.

[0061] Based on this, embodiments of this 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 charger's existing AC voltage detection unit, the voltage value and voltage change trend of the AC voltage can be effectively controlled. After the charger is powered off, the voltage can be reduced to below a safe voltage without the need to add a bleeder resistor.

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

[0063] Reference Figure 1The charger includes an AC input filter circuit, a power factor correction circuit, a resonant power conversion circuit, a high-voltage DC filter circuit, an AC voltage detection unit, an AC circuit detection unit, a power transistor drive unit, a power factor voltage detection unit, a power transistor 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, a low-voltage control processor, and a communication interaction circuit. The circuit consists of the following components: 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 terminal (HVDC+) and the high-voltage DC negative terminal (HVDC-); the AC voltage detection unit is connected to the AC input filter circuit and the detection and drive processor; the power transistor 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 transistor 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; and the low-voltage control processor is connected to the detection and drive processor and the communication interaction circuit via a digital isolator. The charger communicates with the charging gun via a communication circuit, for example, by sending a power-off command using the CC / CP charging protocol to the charging gun.

[0064] The power factor correction (PFC) circuit is used for power conversion and to ensure that the equipment connected to the AC power grid does not generate harmonics or increase additional virtual load. The resonant power conversion circuit (LLC) converts the high-voltage DC isolation of the PFC circuit to high-voltage DC, connecting to the external battery pack. The AC voltage detection circuit is used for data acquisition of the control algorithm of the PFC circuit, assisting in determining the appropriate AC phase point for power-off. The AC current detection circuit is used for data acquisition of the control algorithm of the PFC circuit, assisting in determining whether the charging / discharging power-off state is approaching. The high-voltage DC output filter circuit (EMI) is an essential filter circuit for the external high-voltage battery pack of a complete AC charging pile. The high-voltage DC voltage detection circuit is used for data acquisition of the control algorithm of the resonant power conversion circuit. The high-voltage DC current detection circuit is used for data acquisition of the control algorithm of the resonant power conversion circuit. The MCU / DSP control unit circuit (including the detection and drive processor and the low-voltage control processor) is 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 resonance converter (LLC), so it is also called a PFC & LLC MCU. The communication circuit is used to communicate with the charging gun. The low-voltage control processor is also called a low-voltage control MCU. If the above charger is an on-board charger, it can be connected to the high-voltage power battery through the high-voltage DC positive terminal HVDC+ and the high-voltage DC negative terminal 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, and a vehicle controller and battery management system (VCU & BMS). Specifically, the power step-down unit connects the 12V battery and the low-voltage control processor; the CAN transceiver unit connects the vehicle controller and battery management system and the low-voltage control processor; the charger wake-up unit connects the vehicle controller and battery management system and the low-voltage control processor; the electronic lock control unit connects the vehicle controller and battery management system and the low-voltage control processor; and the AC input line temperature detection unit connects 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 grounded, 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 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 and one end of the sixth capacitor C6. One end of the capacitor is connected to 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 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 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 for the charger provided in the embodiments of this application, it is not necessary to set the first resistor R1 as a discharge resistor in the AC filter input circuit, and the voltage can 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 transistor Q1, a second power transistor Q2, a third power transistor Q3, a fourth power transistor Q4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a twelfth capacitor C12. The connection points between the seventh resistor R7 and the eighth resistor R8, and 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 transistor Q3 and the fourth power transistor Q4. The connection relationships of the components in the power factor correction circuit are as follows: Figure 3 As shown, it will not be elaborated further here.

[0070] Reference Figure 4 The resonant power conversion circuit includes the fifth power transistor Q5, the sixth power transistor Q6, the seventh power transistor Q7, the eighth power transistor Q8, the fifth inductor L5, the sixth common-mode inductor L6, the thirteenth capacitor C13, the fourteenth capacitor C14, the fifteenth capacitor C15, the first transformer T1, the second transformer T2, the ninth power transistor Q9, the tenth power transistor Q10, the eleventh power transistor Q11, the twelfth power transistor Q12, and the sixteenth capacitor. The two 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 transistor Q5, the other end of the fifth power transistor Q5 is connected to one end of the sixth power transistor, and the other end of the sixth power transistor is connected to the other end of the twelfth capacitor. The connection relationships of the various components in the resonant power conversion circuit are as follows: Figure 4 As shown, it will not be elaborated further 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 positive terminal of the high-voltage DC circuit HVDC+, and one end of the twenty-second capacitor C22 is connected to the negative terminal of the high-voltage DC circuit HVDC-. 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, and 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 of the thirteenth resistor R13 and the fourteenth resistor R14 is connected to the high-voltage DC voltage detection unit. The connection relationships of the various components in the high-voltage DC filter circuit are as follows: Figure 5 As shown, it will not be elaborated further here.

[0072] Please refer to Figure 6 , Figure 6 An optional flowchart of a power-off control method for a charger is disclosed. This method can be... Figure 1 The low-voltage control processor shown executes this. Figure 6 The method may include, but is not limited to, steps 601 to 603.

[0073] Step 601: Detect the AC voltage using the AC voltage detection unit of the charger;

[0074] Step 602: Determine the voltage value and voltage change trend detected during the AC voltage detection process;

[0075] Step 603: When the charger is detected to meet the preset trigger power-off control conditions, a power-off action is performed according to the voltage value and voltage change trend to stop AC input charging or AC output discharging.

[0076] Steps 601 to 603 of this application embodiment address the drawbacks of related technologies that require parallel resistors across the AC capacitor to reduce capacitor voltage after power failure, resulting in high power consumption and high cost. This application first detects the AC voltage using the charger's AC voltage detection unit, allowing for timely detection of the AC voltage during charger operation using the charger's existing AC voltage detection unit. Furthermore, the detected voltage value and voltage change trend are determined during AC voltage detection, enabling timely monitoring of the charger's voltage value and voltage change trend. Further, when the charger meets preset trigger power-off control conditions, a power-off action is executed based on the voltage value and voltage change trend. Thus, even when the charger meets the preset trigger power-off control conditions, a direct power-off action is not performed; instead, the voltage value and voltage change trend are considered to ensure that the charger's voltage value and voltage change trend remain within a controllable range after the power-off action, reducing the probability of electric shock. In summary, this application utilizes the charger's existing AC voltage detection unit to effectively control the AC voltage value and voltage change trend, and can reduce the voltage to below the safe voltage after the charger is powered off, without the need to add a bleed resistor.

[0077] In step 601, the charger starts up. The low-voltage control processor communicates with the charging gun (not shown) via a communication circuit and detects the charger's voltage, current, and temperature. The charger has two operating states: AC input charging and AC output discharging. Whether in AC input charging or AC output discharging mode, the AC voltage detection unit detects the AC voltage and transmits it to the low-voltage control processor via the detection and drive processor.

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

[0079] In step 602, the low-voltage control processor determines the detected voltage value and voltage change trend during the AC voltage detection process. The voltage change trend refers to the trend of voltage value change. For example, if the voltage value continues to increase, the voltage change trend is an upward voltage trend. Conversely, if the voltage value continues to decrease, the voltage change trend is a downward voltage trend.

[0080] like Figure 7 As shown, the amplitude of the AC voltage changes periodically with increasing time. Specifically, the charging gun connects the live wire L and the neutral wire N. When the charger is charging with AC input, the neutral wire N is the neutral line, and under normal circumstances, it is at the same potential as the earth's PE line. The product casing is also at the same potential as the neutral wire N, which is 0V, meaning it is safe for human use. Figure 7 As shown, the pressure difference between the live wire L and the neutral wire N is in the form of a sine wave shifted upward by one amplitude, and the pressure difference oscillates periodically between 0V and 622V. Figure 7 The black dashed line represents a safe DC voltage, i.e., 60V. The AC voltage is shown below:

[0081]

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

[0083] In step 603, the trigger power-off control condition refers to the condition that triggers the charger to start power-off control. For example, when the trigger power-off control condition is a charging power-off control condition, it may include conditions such as the BMS being fully charged or receiving an external command. Another example is when the trigger power-off control condition is a discharging power-off control condition, it may include conditions such as the discharge current being zero or the charging gun's relay being turned off. When the charger is detected to meet the preset trigger power-off control condition, it does not directly perform a power-off action, but instead executes a power-off action based on the voltage value and voltage change trend to stop AC input charging or AC output discharging.

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

[0085] When the charger is detected to meet the preset trigger power-off control conditions, 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 based on the voltage value and 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 being zero. The advantage of this embodiment is that it ensures the AC current is less than a certain threshold before determining whether to perform a power-off action based on the AC voltage, thus further improving safety.

[0088] In one embodiment, reference is made to Figure 8 Step 603 includes:

[0089] Step 801: When the charger is detected to meet the preset trigger power-off control conditions, determine the comparison result between the voltage value and the voltage threshold, and determine the comparison result between the voltage change trend and the voltage decrease trend.

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

[0091] For example, refer to Figure 8When power is off, select a voltage range below the voltage threshold (e.g., 60V) where the voltage change trend is decreasing. 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 will be no need for a passive discharge resistor.

[0092] It should be noted that, assuming the detection of the charger meeting the preset trigger power-off control conditions occurs at any point within a sinusoidal period and is uniformly distributed, then the worst-case scenario is... Figure 7 Point B in the middle of the cycle needs to wait for nearly half a cycle, or 0.5 * 1 / (50Hz) = 10ms, before reaching point A in the next cycle. Relevant regulations stipulate that the charging gun should complete the action within 100ms after receiving the power-off command. Therefore, this method only delays the power-off by a maximum of 10ms compared to acting immediately upon receiving the command, which is less than 100ms and meets the standard requirements.

[0093] The advantage of the above embodiments 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 downward trend, the success rate of leaving no residual charge higher than the human body voltage after power-off is improved, thus enhancing electrical safety.

[0094] In one embodiment, after step 801, step 603 further 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 decrease 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 increase 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 increase trend, then return to step 602.

[0095] In one embodiment, step 802 includes:

[0096] If the charger meets the trigger power-off control condition, and if the comparison result shows 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, then a power-off command is generated.

[0097] The power-off command is sent to the charging gun through the communication circuit between the charger and the charging gun. The charging gun then shuts off its relay according to the power-off command to stop AC input charging.

[0098] For example, refer to Figure 1The low-voltage control processor generates a power-off command when the charger meets the trigger power-off control conditions, and if the comparison result shows that the voltage value is less than the voltage threshold and the voltage change trend is downward. The low-voltage control processor sends the power-off command to the charging gun through the communication circuit. The charging gun, based on the power-off command, shuts off its relay to stop the AC power input from the charging gun to the live wire L and neutral wire N of the charger, thereby stopping AC input charging.

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

[0100] In one embodiment, step 802 further includes: if the charger meets the trigger power-off control condition as 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 decrease trend, then the charger circuit is turned off to stop the AC output discharge.

[0101] The circuit that shuts off the charger specifically refers to the circuit that shuts off the charger's current loop, such as the power factor correction circuit, the resonant power conversion circuit, and the charger's relay.

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

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

[0104] Step 802 specifically includes: when the charger meets the trigger power-off control condition (which is also the trigger discharge power-off control condition), and the comparison result shows that the voltage value is less than the voltage threshold and the comparison result indicates a voltage decrease trend, the low-voltage control processor generates a first shutdown command, or generates a first shutdown command and a second shutdown command, and sends the first shutdown command or the first shutdown command and the second shutdown command to the detection and drive processor. The detection and drive processor shuts down the power factor correction circuit according to the first shutdown command. The detection and drive processor shuts down the resonant voltage conversion circuit according to the second shutdown command.

[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, reference is made to Figure 9 Before step 801, the power-off control method for the charger provided in this embodiment may further include:

[0107] Step 901: Determine the safe phase point based on the phase of the preset safe voltage in the AC voltage;

[0108] Step 902: Update the safe phase point according to the execution delay duration to obtain the phase compensation point;

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

[0110] In step 901, the safe voltage can be DC 60V, or it can be within DC 60V. (Refer to...) Figure 7 Assuming the safe voltage is 60V DC, the safe phase point is the phase of the 60V safe voltage in AC voltage, such as point A and point B. During power failure, it must be ensured that the voltage change trend is a decreasing trend; therefore, the power failure action will only be executed at point A.

[0111] In step 902, the execution delay duration is used to characterize the required time 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 voltage change trend, for example, instantly cutting off the power after determining to execute the power-off action at point A, then the execution delay duration is zero. However, the actual execution delay duration is greater than zero. If the execution delay duration is not considered, after determining to execute the power-off action at point A, the power-off may be completed after point B. At this time, the voltage inside the charger is greater than the safe voltage, which can easily cause electric shock to the human body. Therefore, the safe 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 safe voltage after the power-off action is executed.

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

[0113] The detection processing time of the AC voltage detection unit, the communication delay time of the power-off command being transmitted to the relay of the charging gun, and the power-off execution time of the relay are all collected.

[0114] The first execution delay time is obtained by summing the detection and processing time, communication delay time, and power outage execution time.

[0115] Specifically, when the charger meets the trigger power-off control condition, which is the trigger charging power-off control condition, the first execution delay duration is determined as the execution delay duration.

[0116] Specifically, when power is lost, the charging gun's relay also requires a few milliseconds of power-off execution time. In addition, there is a communication delay between the charger issuing the power-off command and the charging gun starting execution. The AC voltage detection unit also requires some detection and processing time for data acquisition and calculation. The sum of these times is denoted as the first execution delay time t. delay1 First execution delay duration t delay1 If the voltage phase change time is greater than the valley phase change time, it will cause the voltage phase to move to a position outside the human safety voltage of DC 60V or above after the actual power outage ends.

[0117] The above embodiments fully consider the impact 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 for the charger provided in this embodiment may further include: obtaining a first execution delay duration, determining a duration shorter than the first execution delay duration, and obtaining a second execution delay duration; wherein, when the power-off control condition met by the charger is a discharge power-off control condition, the second execution delay duration is determined as the execution delay duration.

[0119] Specifically, it differs slightly 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 that of the previous charging power-off situation.

[0120] In one embodiment, reference is made to Figure 11 Step 902 may include:

[0121] Step 1101: Determine the duration of the AC voltage change from the first safe phase point to the second safe phase point, and obtain the valley phase change duration;

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

[0123] In step 1101, the first safe phase point is the safe phase point on one side of the trough of the AC voltage, and the second safe phase point is the safe phase point on the other side of the trough. For example, referring to... Figure 7 or Figure 10 The first safe phase point is point A, and the second safe phase point is point B. The valley phase change duration = detection time at point B - detection time at point A. Assuming the detection time at point B is 0.01799 seconds and the detection time at point A is 0.01201 seconds, then 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, it is possible that the phase after the power-off action will not be between the first safe phase point and the first safe phase point. For example, refer to... Figure 10 Point A needs to be pre-calculated to obtain point C as the phase compensation point. For example, if the phase detected in real time is point C, then a power-off action is executed to shut down the AC output discharge; otherwise, the power-off action is executed at point C of the next AC cycle to achieve the power-off of the AC output discharge.

[0125] The advantage of the embodiments of steps 1101 to 1102 described above is that, when considering updating the safe phase point based on the execution delay duration, the relationship between the execution delay duration and the valley phase change duration is fully considered, thereby achieving accurate updates.

[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 the phase compensation point.

[0130] For example, if the execution delay is 0.006 seconds, the phase difference is 100*π*0.006=0.6π. Advancing the first safe phase point by 0.6π yields the phase compensation point.

[0131] The advantage of the above embodiments is that they can ensure to the greatest extent that the phase at the time of power failure is between the first safe phase point and the second safe phase point after the power failure is performed at the phase compensation point, thereby improving safety.

[0132] In step 903, the voltage at the phase compensation point in the AC voltage is used as the voltage threshold. (Refer to...) Figure 10 If 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 known as inverter external discharge) is disconnected, the AC current is zero and can be used as follows: Figure 1 The AC current detection unit shown detects this. At this point, the charger may not immediately shut off the PFC circuit output, but instead waits until the voltage values ​​of the live wire L and neutral wire N of the AC output discharge are exactly lower than the voltage threshold after compensating for the execution delay, and exactly in a decreasing voltage trend, as shown above. Figure 10 The power-off action is only performed at point C.

[0134] In one embodiment, after a power-off action is performed, if the charger's voltage exceeds the safe voltage, an LED can be used to indicate a power-off anomaly. One end of the LED is connected to the live wire L, and the other end is connected to one end of a current-limiting resistor, with the other end of the current-limiting resistor connected to the neutral wire N. For example, the current-limiting resistor can be a 400V / 20mA = 20kΩ resistor. This alerts the user to a power-off anomaly, reducing the risk of electric shock.

[0135] In one embodiment, if the low-voltage control processor detects a power outage, it discharges power to the AC input filter circuit via the charger's DC voltage reduction circuit. One end of this DC voltage reduction circuit is connected to the output of the high-voltage DC filter circuit, and the other end is connected to the low-voltage control processor. A low-voltage 12V battery (rechargeable battery) supplies power to the low-voltage control processing circuit. This ensures timely power discharge even in the event of a power outage, guaranteeing safety.

[0136] The various technical features in the above embodiments can be combined arbitrarily, 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, the arbitrary combination of various technical features in the above embodiments is also within the scope of this specification.

[0137] This application also discloses a power-off control device for a charger, referring to... Figure 12 The power-off control device for the charger includes a detection module 1201, a determination module 1202, and a power-off module 1203. The detection module 1201 detects the AC voltage using the charger's AC voltage detection unit; the determination module 1202 determines the detected voltage value and voltage change trend during the AC voltage detection process; and the power-off module 1203, when detecting that the charger meets preset trigger power-off control conditions, executes a power-off action based on the voltage value and voltage change trend to stop 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, configured to: determine a safe phase point based on the phase of a preset safe voltage in the AC voltage; update the safe phase point based on the execution delay duration to obtain a phase compensation point, wherein the execution delay duration is used to characterize the required duration for performing the power-off action; and use the voltage of the phase compensation point in the AC voltage as a voltage threshold.

[0139] In one embodiment, the power-off control device of the charger may further include: a duration compensation module, used to: collect the detection processing duration corresponding to the AC voltage detection unit, collect the communication delay duration of the relay transmitting the power-off command to the charging gun, and collect the power-off execution duration of the relay; sum the detection processing duration, the communication delay duration, and the power-off execution duration to obtain a first execution delay duration; wherein, when the power-off control condition met by the charger is the power-off control condition for charging, 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 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 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 described above, and will not be repeated here.

[0142] This application also 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, it implements the power-off control method of the charger as described above.

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

[0144] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the power-off control method for the charger as described above.

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

[0146] This application also provides a computer program product, which includes a computer program that is read and executed by a processor, such that when the processor executes the computer program, it implements the power-off control method for the charger as described above.

[0147] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

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

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

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

[0151] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0152] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0153] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

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

[0155] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0156] If the integrated unit is implemented as 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 this application, in essence, 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. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0157] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A power-off control method of a charger, characterized by, The method comprises: detecting an AC voltage by an AC voltage detection unit of a charger; determining a voltage value and a voltage change trend detected in the process of detecting the AC voltage; in the case where it is detected that the charger meets a preset triggering power-off control condition, performing a power-off action according to a comparison result between the voltage value and a voltage threshold and the voltage change trend, so as to stop AC input charging or AC output discharging; wherein the voltage threshold is determined by the following steps: determining a safe phase point according to a preset safe voltage in a phase of the AC voltage; determining a valley bottom phase change duration from a first safe phase point to a second safe phase point of the AC voltage, to obtain a valley bottom phase change duration, wherein the first safe phase point is the safe phase point on one side of a trough of the AC voltage, and the second safe phase point is the safe phase point on the other side of the trough; if the valley bottom phase change duration is less than an execution delay duration, the first safe phase point is advanced to obtain a phase compensation point, wherein the execution delay duration represents a required duration for performing the power-off action; taking a voltage of the phase compensation point in the AC voltage as the voltage threshold.

2. The method of claim 1, wherein, In the case where it is detected that the charger meets a preset triggering power-off control condition, performing a power-off action according to a comparison result between the voltage value and a voltage threshold and the voltage change trend, comprises: in the case where it is detected that the charger meets a preset triggering power-off control condition, determining the comparison result between the voltage value and the 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 drop trend, performing the power-off action.

3. The method of claim 2, wherein, 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 drop trend, performing the power-off action comprises: if the triggering power-off control condition met by the charger is a 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 drop trend, generating a power-off instruction; sending the power-off instruction to the charging gun through a communication interaction circuit between the charger and the charging gun, so that the charging gun turns off a relay of the charging gun according to the power-off instruction, to stop AC input charging; if the triggering power-off control condition met by the charger is a triggering discharging 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 drop trend, turning off a circuit of the charger to stop the AC output discharging.

4. The method of claim 1, wherein, If the valley bottom phase change duration is less than the execution delay duration, the first safe phase point is advanced to obtain a phase compensation point, comprising: if the valley bottom phase change duration is less than the execution delay duration, a phase compensation value is calculated according to the execution delay duration; advancing the first safe phase point by the phase compensation value to obtain the phase compensation point.

5. The method of claim 1, wherein, Before the first safety phase point is advanced to obtain a phase compensation point, if the valley bottom phase change duration is less than the execution delay duration, the method further comprises: collecting a detection processing duration of the AC voltage detection unit, a communication delay duration of a relay of the charging gun, and a power-off execution duration of the relay; summing the detection processing duration, the communication delay duration, and the power-off execution duration to obtain a first execution delay duration; wherein the first execution delay duration is determined as the execution delay duration when the charging machine satisfies the trigger power-off control condition.

6. The method according to any one of claims 1 to 5, characterized in that, Before the power-off action is performed according to the comparison result between the voltage value and the voltage threshold value and the voltage change trend, the method further comprises: detecting an AC current by an AC current detection unit of the charging machine; if the AC current is less than a preset current threshold value, triggering the power-off action according to the comparison result between the voltage value and the voltage threshold value and the voltage change trend.

7. A power-off control device for a charger, characterized in that, The device comprises: a detection module configured to detect an AC voltage by an AC voltage detection unit of a charging machine; a determination module configured to determine a voltage value and a voltage change trend detected in the process of detecting the AC voltage; a power-off module configured to, if it is detected that the charging machine satisfies a preset trigger power-off control condition, perform a power-off action according to a comparison result between the voltage value and a voltage threshold value and the voltage change trend, so as to stop AC input charging or AC output discharging; wherein the voltage threshold value is determined by the following steps: determining a safety phase point according to a phase of a preset safety voltage in the AC voltage; determining a valley bottom phase change duration of the AC voltage from a first safety phase point to a second safety phase point, wherein the first safety phase point is the safety phase point on one side of a wave trough of the AC voltage, and the second safety phase point is the safety phase point on the other side of the wave trough; if the valley bottom phase change duration is less than an execution delay duration, advancing the first safety phase point to obtain a phase compensation point, wherein the execution delay duration represents a required duration for performing the power-off action; taking a voltage of the phase compensation point in the AC voltage as the voltage threshold value.

8. A charger characterized by comprising: The computer program is stored in the memory and can be run on the processor, and the processor implements the method according to any one of claims 1 to 6 when executing the computer program.

9. A vehicle characterized by comprising: The charging machine comprises the charging machine according to claim 8.

10. A computer-readable storage medium, characterized in that, The computer program is stored on the computer readable storage medium and is executed to implement the method according to any one of claims 1 to 6.

11. A computer program product, characterised in that, The computer program product comprises a computer program, which is read and executed by a processor, so that the processor implements the method according to any one of claims 1 to 6 when executing the computer program.

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