Fault detection method and device of charging module, electronic equipment and storage medium

Abstract

The invention provides a fault detection method and device of a charging module, electronic equipment and a storage medium, and relates to the technical field of electric power facilities. The method comprises the steps that according to hardware information of a charging module, safe operation parameters of the charging module under a preset input source are determined, the safe operation parameters comprise threshold voltage and maintaining time, and the threshold voltage is used for indicating a critical value of safe input voltage corresponding to a power device in the charging module; the holding time is used for indicating the bearable maximum duration after the input voltage of the charging module drops to the threshold voltage; acquiring working condition information of the charging module under a preset input source in real time; and based on the safe operation parameters and the working condition information of the charging module under the preset input source, determining whether the charging module has an input flash fault, and if so, outputting flash fault alarm information. According to the invention, on the premise of not additionally adding a power level circuit and components, whether the charging module has an input flash fault is timely and accurately detected.

Description

Technical Field

[0001] The present application relates to the technical field of electric power facilities, and in particular to a fault detection method, device, electronic device and storage medium for a charging module. Background Art

[0002] In the charging pile industry, the stability and reliability of the charging module is one of the key factors to ensure the normal operation of the charging pile. However, due to unstable power grid quality or improper operation by operators, AC input flashover often occurs, which seriously affects the service life of the charging module.

[0003] The existing fault detection method mainly achieves power-off warning by adding additional circuit structures such as auxiliary power supplies and large-value resistors. However, this method has high hardware complexity and requires modifications to existing circuits, which not only increases design and operating costs, but also introduces additional circuit structures that easily lead to new fault points, which in turn affects the overall reliability of the charging pile system. Therefore, the existing fault detection method has obvious deficiencies in detecting whether the charging module has input flashover. Summary of the invention

[0004] The purpose of the present application is to provide a charging module fault detection method, device, electronic device and storage medium to address the deficiencies in the prior art, so as to solve the obvious deficiencies in the prior art in detecting whether a charging module has input flashover.

[0005] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0006] In a first aspect, an embodiment of the present application provides a method for detecting a fault of a charging module, the method comprising:

[0007] Determine the safe operation parameters of the charging module under a preset input source according to the hardware information of the charging module, wherein the preset input source includes a three-phase input AC source or a single-phase input AC source, and the safe operation parameters include a threshold voltage and a holding time, wherein the threshold voltage is used to indicate a critical value of a safe input voltage corresponding to a power device in the charging module, and the holding time is used to indicate a maximum duration that the input voltage of the charging module can withstand after dropping to the threshold voltage;

[0008] Collecting the working condition information of the charging module under the preset input source in real time;

[0009] Based on the safe operation parameters of the charging module under the preset input source and the working condition information of the charging module under the preset input source, it is determined whether the charging module has an input flash failure, and if so, a flash failure alarm message is output.

[0010] As a possible implementation manner, determining the safe operation parameters of the charging module under a preset input source according to the hardware information of the charging module includes:

[0011] The safe operation parameters of the charging module under the preset input source are determined according to stress information of at least one power device in the charging module, wherein the stress information includes a voltage stress value and a current stress value.

[0012] As a possible implementation manner, determining the safe operation parameters of the charging module under the preset input source according to the stress information of at least one power device in the charging module includes:

[0013] In the process of the preset input source inputting voltage to the charging module, determining a first moment when the input voltage drops to a first preset value, and a second moment when the input voltage maintains the first preset value for a preset time and then recovers to a target charging voltage of the charging module, wherein the target charging voltage is a voltage within a voltage range within which the charging module can work normally;

[0014] The voltage stress value and the current stress value of the power device in the charging module at the second moment are compared with the preset voltage limit value and the preset current limit value respectively to obtain a comparison result, and the safe operation parameter is determined according to the comparison result.

[0015] As a possible implementation manner, determining the safe operation parameter according to the comparison result includes:

[0016] If the voltage stress value of the power device at the second moment reaches the preset voltage limit value, and the current stress value of the power device reaches the preset current limit value, the input voltage corresponding to the second moment is used as the threshold voltage; otherwise, the first preset value is adjusted until the voltage stress value of the power device in the charging module reaches the preset voltage limit value, and the current stress value of the power device reaches the preset current limit value at the third moment, and the input voltage corresponding to the third moment is used as the threshold voltage.

[0017] As a possible implementation manner, determining the safe operation parameter according to the comparison result includes:

[0018] If the voltage stress value of the power device reaches the preset voltage limit value and the current stress value of the power device reaches the preset current limit value at the second moment, the preset time is used as the maintenance time.

[0019] As a possible implementation manner, determining whether an input flash failure occurs in the charging module based on the safe operation parameters of the charging module under the preset input source and the working condition information of the charging module under the preset input source includes:

[0020] If the three-phase input voltages of the charging module under the three-phase input AC source are all lower than the threshold voltage, and the first duration corresponding to the charging module is greater than or equal to the maintenance time, it is determined that the charging module has the input flash failure, wherein the first duration is the duration between the fourth moment when the three-phase input voltage drops to the threshold voltage and the fifth moment when the charging module recovers to a preset state, and the preset state indicates a state in which the voltage and current of at least one power device in the charging module reach the maximum limit safety value.

[0021] As a possible implementation manner, determining whether an input flash failure occurs in the charging module based on the safe operation parameters of the charging module under the preset input source and the working condition information of the charging module under the preset input source includes:

[0022] If the single-phase input voltage of the charging module under the single-phase input AC source is less than the threshold voltage, and the second duration corresponding to the charging module is greater than or equal to the maintenance time, it is determined that the charging module has the input flash failure, wherein the second duration is the duration between the sixth moment when the single-phase input voltage drops to the threshold voltage and the seventh moment when the charging module returns to a preset state.

[0023] In a second aspect, an embodiment of the present application provides a fault detection device for a charging module, the device comprising: a sampling module and a detection module, the sampling module being used to collect the input voltage of the charging module, and the detection module being used to execute the fault detection method for the charging module described in any one of the above-mentioned first aspects.

[0024] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium through the bus, and the processor executes the machine-readable instructions to perform the steps of the charging module fault detection method as described in any one of the first aspects above.

[0025] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the charging module fault detection method as described in any one of the first aspects above are executed.

[0026] According to the fault detection method, device, electronic device and storage medium of the charging module of the embodiment of the present application, the safe operation parameters of the charging module under the preset input source are determined according to the hardware information of the charging module, the working condition information of the charging module under the preset input source is collected in real time, and based on the safe operation parameters of the charging module under the preset input source and the working condition information of the charging module under the preset input source, it is determined whether the charging module has an input flash failure, and if so, a flash failure alarm information is output. Among them, the preset input source includes a three-phase input AC source or a single-phase input AC source, and the safe operation parameters include a threshold voltage and a holding time. The threshold voltage is used to indicate the critical value of the safe input voltage corresponding to the power device in the charging module, and the holding time is used to indicate the maximum duration that the input voltage of the charging module can withstand after dropping to the threshold voltage. According to the embodiments of the present application, there is no need to add additional power and electronic components, the detection cost of input flash failure is low, and based on the currently existing sampling voltage, only effective logic calculations are added to accurately detect whether the charging module has an input flash failure, and flash alarm information is output in time. In this way, through precise detection and rapid response, faults caused by input flash can be effectively avoided, ensuring that the charging module can operate stably under various working conditions and avoiding damage to the power devices inside the charging module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the architecture of a fault detection device for a charging module provided in an embodiment of the present application is shown;

[0029] Figure 2 A schematic diagram of a flow chart of a fault detection method for a charging module provided in an embodiment of the present application is shown;

[0030] Figure 3 A schematic diagram of a process for determining a safe operation parameter provided in an embodiment of the present application is shown;

[0031] Figure 4 A schematic diagram of a threshold voltage and a holding time provided in an embodiment of the present application is shown;

[0032] Figure 5 A schematic flow chart of a method for detecting a fault of input flash failure provided by an embodiment of the present application is shown;

[0033] Figure 6 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0034] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0035] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0036] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0037] When the AC input power is cut off due to poor grid quality or improper operation by operators, the service life of the charging module in the charging pile will be seriously affected. Among them, there are mainly two types of input AC power outages. One is that the AC side is powered off for a long time. At this time, the voltage of the internal components of the charging module slowly decreases until it is fully discharged. This kind of power failure is relatively safe for the charging module. The other is input flash. Input flash refers to the phenomenon that when the AC voltage is normally input, it suddenly drops to zero or an extremely low value in a short period of time, and the extremely low value is maintained for a very short time and then returns to the normal AC value. When the input flash is in the process of recovery, the internal components of the charging module will be suddenly charged when its voltage is extremely low. At this time, the power devices such as the diode, insulated gate bipolar transistor (IGBT) or aluminum electrolytic in the charging module will be damaged, causing damage to the charging module. Therefore, it is very important to adopt an effective and reliable flash protection strategy to avoid damage to the charging module.

[0038] The existing power-off protection strategy relies on hardware circuit design, which means that additional circuit structures need to be added, such as auxiliary power supplies, large-value resistors, etc., so as to achieve power-off protection by changing the circuit design. However, this method has high operating costs, and adding circuit structures can easily introduce new fault points.

[0039] In response to the above problems, the present application provides a clear and effective input flash fault detection method. Without adding power-stage circuits and components, effective logical calculations can be used to accurately detect whether an input flash fault occurs in a charging device, and flash fault alarm information can be output in time. At the same time, the charging module can be shut down, so that the charging module stops working in time when an input flash fault occurs, thereby protecting the charging module devices from damage.

[0040] Figure 1 The schematic diagram of the structure of a fault detection device for a charging module provided in an embodiment of the present application is shown. Figure 1 As shown, the fault detection device includes a sampling module and a detection module, wherein the sampling module is used to collect the input voltage of the charging module, and the detection module is used to execute the steps in the fault detection method of the charging module.

[0041] Optionally, taking a three-phase input AC source as an example, the sampling module includes an electromagnetic interference circuit (EMI), a rectifier circuit (ACDC conversion circuit), an AC sampling unit and multiple resistors. When the three-phase input power of the three-phase input AC source passes through the EMI circuit, the ACDC conversion circuit converts the alternating current (AC) into direct current (DC) and outputs it, and the three-phase voltage U output by the AC sampling unit is sampled. a , U b , U c , and the three-phase voltage U a , U b , U c The signal is sent to the detection module, which performs logical judgment to determine whether an input flash failure occurs in the charging module, and outputs a flash failure alarm message after an alarm judgment.

[0042] Based on this, the fault detection device of the charging module provided by the embodiment of the present application only uses the sampling module to detect the AC signal, and the detection module detects whether the charging module has an input flash fault based on the threshold voltage and the maintenance time. In this process, since the AC voltage detection circuit corresponding to the sampling module is already available in the charging pile circuit design, the present application collects the AC voltage signal through the existing AC voltage detection circuit, and the detection module performs fault detection, without the need to add other circuit structures or components, the operating cost is relatively low, and it is possible to promptly detect whether the charging module has an input flash fault and take corresponding measures in a timely manner.

[0043] The following is combined with the above Figure 1 The contents described in the fault detection device of the charging module shown are used to explain in detail the fault detection method of the charging module provided in the embodiment of the present application.

[0044] Figure 2 A schematic diagram of a flow chart of a method for detecting a fault in a charging module provided in an embodiment of the present application. Figure 2 As shown, the execution subject of this method is, and the specific execution process is:

[0045] S201. Determine safe operating parameters of the charging module under a preset input source according to hardware information of the charging module.

[0046] Optionally, the preset input source refers to an input source that the charging module can accept as a power input, such as a three-phase input AC source or a single-phase input AC source. Different input sources will affect the operating characteristics of the charging module.

[0047] Optionally, the safe operation parameters include a threshold voltage and a maintenance time. The threshold voltage is used to indicate the critical value of the safe input voltage corresponding to the power device in the charging module. When the input voltage of the charging module is lower than the threshold voltage, the power device inside the charging module may exceed its safe operating range, thereby posing a risk of damage. The maintenance time is used to indicate the maximum duration that the input voltage of the charging module can withstand after dropping to the threshold voltage. If the input voltage is below the threshold voltage for longer than the maintenance time, the power device inside the charging module will be subjected to a safe voltage and current exceeding its maximum limit, thereby causing damage to the charging module.

[0048] Optionally, the hardware information of the charging module is determined based on the characteristics of each power device inside the charging module. Since there are power devices such as diodes, IGBTs or aluminum electrolytics inside the charging module, the maximum limit safety value of the voltage and current of each power device is different. However, under the condition of input flashover, because it is an instantaneous voltage mutation, the aluminum electrolytic, electronic and other devices inside the charging module will withstand it for a longer time, so they will not be damaged. The damaged ones are generally the tubes in the charging module topology, so the safe operation parameters of the charging module under different input sources can be determined based on the characteristics of the diodes in the charging module.

[0049] S202: Collect working condition information of the charging module under a preset input source in real time.

[0050] Optionally, the operating condition information refers to data used to reflect the state of the charging module during operation. Based on the sampling module, the state data of the charging module in real-time operation is collected in real time, such as the input voltage of the charging module under a three-phase input AC source or the input voltage under a single-phase input AC source, and the change of the input voltage over time, so as to compare the real-time collected operating condition information with the safe operation parameters determined according to the hardware information of the charging module to determine whether the charging module is operating normally and whether an input flash failure occurs.

[0051] S203. Based on the safe operation parameters of the charging module under the preset input source and the working condition information of the charging module under the preset input source, determine whether the charging module has an input flash failure. If so, output a flash failure alarm message.

[0052] Optionally, input voltage monitoring and duration judgment are performed based on the safe operating parameters and operating condition information of the charging module under a preset input source. Specifically, the current input voltage is compared with the threshold voltage in real time. If the current input voltage is less than the threshold voltage, the duration of the input voltage below the threshold voltage and the recovery time for the input voltage to return to a voltage within the normal operating range of the charging module are further recorded. The actual duration of the input voltage is determined based on the duration and the recovery time, and the actual duration of the input voltage is compared with the maintenance time. If the actual duration exceeds the maintenance time, it is determined that an input flash fault has occurred in the charging module.

[0053] Optionally, when an input flash fault is detected in the charging module, a flash fault alarm message is output, and the output method includes but is not limited to sending alarm prompt information, sound and light alarm, etc., thereby triggering the input flash fault alarm to prompt the user to take corresponding protective measures, such as immediately shutting down the charging module, stopping the charging module from working, and preventing damage to the power devices inside the charging module.

[0054] Based on this, according to the fault detection method of the charging module provided in the embodiment of the present application, there is no need to add additional power and electronic components, the detection cost of the input flash fault is low, and based on the currently existing sampling voltage, only effective logic calculations are added to accurately detect whether the charging module has an input flash fault, and output the flash alarm information in time. In this way, through precise detection and rapid response, faults caused by input flashes can be effectively avoided, ensuring that the charging module can operate stably under various working conditions and avoiding damage to the power devices inside the charging module.

[0055] As a possible implementation method, the above step S201 determines the safe operating parameters of the charging module under a preset input source based on the hardware information of the charging module, including: determining the safe operating parameters of the charging module under a preset input source based on the stress information of at least one power device in the charging module.

[0056] Optionally, the stress information of the power device is information that determines the working conditions and safety of the power device, and the stress information includes a voltage stress value and a current stress value, wherein the voltage stress value refers to the maximum voltage value that the power device withstands during operation, and the current stress value refers to the maximum current that flows through the power device during operation.

[0057] Optionally, since each power device included in the charging module has its own specific electrical characteristics and operating range, in order to ensure that the power devices in the charging module are not damaged in time when an input flash failure occurs, while ensuring that the charging module is in normal working condition, the voltage stress value and current stress value of each power device under different input voltages from different input sources can be determined through experimental testing or simulation analysis.

[0058] Figure 3 The following is a flow chart of a method for determining safe operation parameters provided by an embodiment of the present application. Figure 3 As shown, the above steps determine the safe operation parameters of the charging module under the preset input source according to the stress information of at least one power device in the charging module, and specifically include the following steps:

[0059] S301. In the process of a preset input source inputting voltage to a charging module, determine a first moment when the input voltage drops to a first preset value, and a second moment when the input voltage maintains the first preset value for a preset time and recovers to a target charging voltage of the charging module.

[0060] Exemplarily, the preset input source is the source of voltage provided to the charging module, and its voltage value fluctuates within a certain range, and the input voltage is the voltage received by the charging module from the preset input source. There will be voltage fluctuations in the process of the preset input source inputting the voltage to the charging module. When the input voltage drops to the first preset value V testWhen the time is recorded as the first time t1, the first preset value V test Usually a lower voltage value, indicating that the voltage has fallen below a certain safe or normal operating threshold.

[0061] For example, if the input voltage is maintained at the first preset value V test After the preset time t, the target charging voltage of the charging module is restored, and this moment is recorded as the second moment t2. The target charging voltage is a voltage value within the voltage range in which the charging module can work normally, ensuring that the charging module can work normally.

[0062] S302: Compare the voltage stress value and the current stress value of the power device in the charging module at the second moment with the preset voltage limit value and the preset current limit value respectively to obtain a comparison result, and determine the safe operation parameters according to the comparison result.

[0063] Optionally, the preset voltage limit value and the preset current limit value are the maximum voltage and current values ​​that the power device can withstand, and exceeding these values ​​may cause damage to the power device or performance degradation. At the second moment t2, that is, when the input voltage is restored to the target charging voltage, the voltage stress value and the current stress value of the power device in the charging module are measured. At this time, the voltage stress value and the current stress value reflect the working state of the power device during the voltage recovery process. On this basis, the voltage stress value and the current stress value measured at the second moment t2 are compared with the preset voltage limit value and the preset current limit value, respectively, to obtain a comparison result, and the safe operation parameters of the charging module are determined according to the comparison result to ensure that the power device is not subjected to excessive stress under similar input conditions.

[0064] Optionally, the above steps determine the safe operating parameters based on the comparison results, including: if the voltage stress value of the power device at the second moment reaches a preset voltage limit value, and the current stress value of the power device reaches a preset current limit value, then the input voltage corresponding to the second moment is used as the threshold voltage; otherwise, the first preset value is adjusted until the voltage stress value of the power device in the charging module reaches the preset voltage limit value, and the current stress value of the power device reaches the preset current limit value at the third moment, and the input voltage corresponding to the third moment is used as the threshold voltage.

[0065] For example, if the voltage stress value of the power device at the second moment t2 reaches the preset voltage limit value U peak , and the current stress value also reaches the preset current limit value I peak , the input voltage corresponding to the second moment t2 is used as the threshold voltage, which represents the highest input voltage at which the charging module can work safely without exceeding the stress limit of the power device.

[0066] For example, if the voltage stress value or the current stress value of the power device does not reach the respective limit value at the second time t2, the first preset value V needs to be adjusted. test , which is the threshold of input voltage drop. By adjusting the first preset value V test , and observe whether the stress value of the power device reaches the limit value at a subsequent moment (for example, the third moment), to find the input voltage value that makes the stress of the power device reach the limit. Based on this, when the voltage stress value and the current stress value of the power device reach their respective limit values ​​at a certain moment (such as the third moment t3) by adjusting the first preset value, the input voltage corresponding to the moment is used as the final threshold voltage V th .

[0067] Optionally, the above steps determine the safe operation parameters according to the comparison results, including: if the voltage stress value of the power device at the second moment reaches a preset voltage limit value, and the current stress value of the power device reaches a preset current limit value, then the preset time is used as the maintenance time.

[0068] Exemplarily, if the voltage stress value and the current stress value of the power device at the second moment t2 both reach their respective limit values, then at this time, the previously set preset time t can be considered as the maintenance time T. The maintenance time T refers to the length of time that the charging module should maintain the current state (such as input voltage, charging rate, etc.) unchanged under the condition of reaching the limit stress, so as to ensure the safety of each power device in the charging module.

[0069] For example, refer to Figure 4 As shown, V th represents the threshold voltage, and T represents the holding time. When the input voltage of the charging module drops to the first preset value V test , and when the input voltage suddenly recovers after a preset time t, the voltage and current of the power devices inside the charging module have reached the maximum limit safety value, that is, the voltage and current have reached the preset voltage limit value U peak and preset current limit value I peak , the voltage at this moment can be taken as the threshold voltage V th That is to say, the lowest input voltage allowed to drop by the charging module is V th , the input flash value is lower than V th , the power devices in the charging module will be at risk of damage.

[0070] Based on this, the safe operating parameters of the charging module under a preset input source are determined according to the stress information of the power devices in the charging module, so as to more accurately reflect the tolerance of the charging module under specific working conditions, thereby ensuring the safety and reliability of the charging module.

[0071] As a possible implementation method, the above-mentioned step S203 determines whether an input flash fault occurs in the charging module based on the safe operation parameters of the charging module under the preset input source and the operating condition information of the charging module under the preset input source, including: if the three-phase input voltages of the charging module under the three-phase input AC source are all less than the threshold voltage, and the first duration corresponding to the charging module is greater than or equal to the maintenance time, then it is determined that an input flash fault occurs in the charging module.

[0072] Exemplarily, the first duration is the duration between the fourth moment when the three-phase input voltage drops to the threshold voltage and the fifth moment when the charging module recovers to the preset state. The preset state indicates that the voltage and current of at least one power device in the charging module have reached the maximum limit safety value, which means that the charging module has recovered to a certain reference state in which it can operate safely.

[0073] For example, when the preset input source is a three-phase input AC source, the three-phase input voltage refers to the voltage of the three phases input from the three-phase input AC source to the charging module. If the three-phase input voltage of the charging module is lower than the threshold voltage V under the three-phase input AC source, th , and if the duration of this state (ie, the first duration) is greater than or equal to the preset maintenance time T, it is considered that an input flash failure has occurred in the charging module.

[0074] Optionally, the above step S203 determines whether an input flash fault occurs in the charging module based on the safe operating parameters of the charging module under the preset input source and the operating condition information of the charging module under the preset input source, including: if the single-phase input voltage of the charging module under the single-phase input AC source is less than the threshold voltage, and the second duration corresponding to the charging module is greater than or equal to the maintenance time, then it is determined that an input flash fault occurs in the charging module.

[0075] Exemplarily, the second duration is the duration between the sixth moment when the single-phase input voltage drops to the threshold voltage and the seventh moment when the charging module recovers to the preset state, that is, the time period from the moment when the single-phase input voltage drops below the threshold voltage (the sixth moment) to the moment when the charging module recovers to the preset state (the seventh moment).

[0076] For example, when the preset input source is a single-phase input AC source, the single-phase input voltage refers to the voltage input from the single-phase input AC source to the charging module. If the single-phase input voltage of the charging module under the single-phase input AC source is less than the threshold voltage V th , and if the duration of this state (i.e., the second duration) is greater than or equal to the preset maintenance time T, it is considered that an input flash failure has occurred in the charging module.

[0077] Based on this, by monitoring the voltage change and time information of the charging module under a three-phase input AC source or a single-phase input AC source, it is determined whether the charging module has an input flash failure, which effectively improves the safety and reliability of the charging module.

[0078] Figure 5 The flowchart of a method for detecting input flash failure provided by an embodiment of the present application is shown. Figure 5 As shown, taking the preset input source as a three-phase input AC source as an example, when the charging module is in normal operation, the three-phase input voltage of the charging module is collected, for example, the A-phase input voltage U a , B phase input voltage U b and C phase input voltage U c , if the A phase input voltage U a , B phase input voltage U b and C phase input voltage U c are both less than the threshold voltage V th , then the fault time counter records the time information, such as when the three-phase input voltage drops to the threshold voltage V th If the duration recorded by the fault time counter is greater than or equal to the maintenance time T, it is determined that the charging module has an input flash fault, and a flash fault alarm message is output, and the charging module is turned off to stop working, so as to ensure that the power devices in the charging module are not damaged.

[0079] It should be noted that, in the embodiment of the present application, if the sample is the line voltage, the first preset value V test It should be converted to the corresponding line voltage for logic judgment value. There are many conversion combinations here, but the following principles need to be followed: Regardless of whether the sampling is line voltage or phase line voltage, the three-phase input voltage U used for logic judgment a , U b , U c Must be consistent with the first preset value V test Corresponding, that is, the first preset value V test The actual measurement is based on the line voltage, so the phase U is used in the judgment logic. a , U b , U c The threshold value for phase voltage judgment becomes V test / 1.414, if the first preset value V test The actual measurement is based on the phase voltage, so the phase U a , U b , U c The threshold value for phase voltage judgment becomes V test , if the first preset value V test The actual measurement is based on the line voltage, so the phase U is used in the judgment logic. a , Ub , U c The threshold value for line voltage is V test ; If the first preset value V test The actual measurement is based on the phase voltage, so the phase U a , U b , U c The threshold value for line voltage is V test *1.414.

[0080] Based on this, the fault detection method of the charging module provided in the embodiment of the present application does not require additional power and electronic components, so the cost is relatively low. In addition, based on the current existing sampling voltage, only effective logic calculation is added to accurately detect whether the charging module has an input flash failure, and output the flash failure alarm information in time, thereby ensuring the safety of the charging module.

[0081] The present application embodiment also provides an electronic device 600, such as Figure 6 As shown, it is a schematic diagram of the structure of an electronic device 600 provided in an embodiment of the present application, including: a processor 601, a memory 602, and optionally, a bus 603. The memory 602 stores machine-readable instructions executable by the processor 601. When the electronic device 600 is running, the processor 601 communicates with the memory 602 through the bus 603. When the machine-readable instructions are executed by the processor 601, the method steps in the fault diagnosis method of the charging module described in any one of the above items are executed.

[0082] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method steps in the fault diagnosis method for a charging module as described in any one of the above items are executed.

[0083] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the method embodiment, and will not be repeated in this application. In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules 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 communication interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0084] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. If the function 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 invention is essentially or part of the technical solution that contributes to the prior art 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 several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk and other media that can store program code.

[0085] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A method for detecting a fault in a charging module, characterized in that: include: Determine the safe operation parameters of the charging module under a preset input source according to the hardware information of the charging module, wherein the preset input source includes a three-phase input AC source or a single-phase input AC source, and the safe operation parameters include a threshold voltage and a holding time, wherein the threshold voltage is used to indicate a critical value of a safe input voltage corresponding to a power device in the charging module, and the holding time is used to indicate a maximum duration that the input voltage of the charging module can withstand after dropping to the threshold voltage; Collecting the working condition information of the charging module under the preset input source in real time; Based on the safe operation parameters of the charging module under the preset input source and the working condition information of the charging module under the preset input source, it is determined whether the charging module has an input flash failure. If so, a flash failure alarm message is output.

2. The method according to claim 1, characterized in that The step of determining the safe operation parameters of the charging module under a preset input source according to the hardware information of the charging module includes: The safe operation parameters of the charging module under the preset input source are determined according to stress information of at least one power device in the charging module, wherein the stress information includes a voltage stress value and a current stress value.

3. The method according to claim 2, characterized in that The step of determining the safe operation parameters of the charging module under the preset input source according to the stress information of at least one power device in the charging module includes: In the process of the preset input source inputting voltage to the charging module, determining a first moment when the input voltage drops to a first preset value, and a second moment when the input voltage maintains the first preset value for a preset time and then recovers to a target charging voltage of the charging module, wherein the target charging voltage is a voltage within a voltage range within which the charging module can work normally; The voltage stress value and the current stress value of the power device in the charging module at the second moment are compared with the preset voltage limit value and the preset current limit value respectively to obtain a comparison result, and the safe operation parameter is determined according to the comparison result.

4. The method according to claim 3, characterized in that Determining the safe operation parameter according to the comparison result includes: If the voltage stress value of the power device at the second moment reaches the preset voltage limit value, and the current stress value of the power device reaches the preset current limit value, the input voltage corresponding to the second moment is used as the threshold voltage; otherwise, the first preset value is adjusted until the voltage stress value of the power device in the charging module reaches the preset voltage limit value, and the current stress value of the power device reaches the preset current limit value at the third moment, and the input voltage corresponding to the third moment is used as the threshold voltage.

5. The method according to claim 3, characterized in that: Determining the safe operation parameter according to the comparison result includes: If the voltage stress value of the power device reaches the preset voltage limit value and the current stress value of the power device reaches the preset current limit value at the second moment, the preset time is used as the maintenance time.

6. The method according to claim 1, characterized in that The determining whether an input flash failure occurs in the charging module based on the safe operation parameters of the charging module under the preset input source and the working condition information of the charging module under the preset input source includes: If the three-phase input voltages of the charging module under the three-phase input AC source are all lower than the threshold voltage, and the first duration corresponding to the charging module is greater than or equal to the maintenance time, it is determined that the charging module has the input flash failure, wherein the first duration is the duration between the fourth moment when the three-phase input voltage drops to the threshold voltage and the fifth moment when the charging module recovers to a preset state, and the preset state indicates a state in which the voltage and current of at least one power device in the charging module reach the maximum limit safety value.

7. The method according to claim 1, characterized in that The determining whether an input flash failure occurs in the charging module based on the safe operation parameters of the charging module under the preset input source and the working condition information of the charging module under the preset input source includes: If the single-phase input voltage of the charging module under the single-phase input AC source is less than the threshold voltage, and the second duration corresponding to the charging module is greater than or equal to the maintenance time, it is determined that the charging module has the input flash failure, wherein the second duration is the duration between the sixth moment when the single-phase input voltage drops to the threshold voltage and the seventh moment when the charging module returns to a preset state.

8. A fault detection device for a charging module, characterized in that: The device comprises: a sampling module and a detection module, wherein the sampling module is used to collect the input voltage of the charging module, and the detection module is used to execute the fault detection method of the charging module according to any one of claims 1 to 7.

9. An electronic device, characterized in that: include: A processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor executes the machine-readable instructions to perform the steps of the charging module fault detection method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the fault detection method for the charging module as described in any one of claims 1 to 7 are executed.

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