Off-board DC charger detection system and detection method

Abstract

The invention relates to the technical field of charger detection, in particular to a non-vehicle-mounted direct current charger detection system and method, and the system comprises an upper computer, a three-phase variable power supply, a charger tester, a load, and an oscilloscope. The charger tester is used for simulating the whole charging process, simulating faults and collecting corresponding electrical parameters. The oscilloscope collects electrical waveform data of the to-be-tested direct current charger during charging, and the upper computer performs diagnosis by using the electrical parameters and the electrical waveform data. The upper computer serves as a control center of the system, all devices of the detection system can be controlled in a centralized mode, the charger tester and the load jointly simulate an electric automobile, the full-charging process and faults are simulated, and the whole set of charging behaviors of the direct-current charger to be tested in the charging process are matched; therefore, the fault response and processing capability of the to-be-detected direct-current charger can be detected, the automation degree of the detection of the non-vehicle-mounted direct-current charger can be improved, and the detection time can be shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of charger detection, and in particular to a non-vehicle-mounted direct current charger detection system and detection method. Background Art

[0002] With the rapid development of the electric vehicle industry, non-on-board DC chargers, as an important part of electric vehicle charging facilities, play a vital role in the popularization and application of electric vehicles due to their performance and quality. Non-on-board DC chargers are mainly used to provide fast charging services for electric vehicles at charging stations or specific places. Their working principle is to rectify and regulate the current of the connected AC grid before outputting it to ensure the quality and stability of the power output.

[0003] The testing of off-board DC chargers needs to follow a series of strict standards to ensure that their performance, safety and compatibility meet industry requirements.

[0004] Most of the current off-board DC charger detection methods rely on manual operation and manual measurement, which results in low detection efficiency and is susceptible to human factors. For example, in parameter accuracy detection, it is necessary to manually set and adjust the test parameters and manually record the measurement results. This manual operation is not only time-consuming and labor-intensive, but also prone to human errors, affecting the accuracy and reliability of the test results.

[0005] Since the inspection items of non-on-board DC chargers are numerous and complex, the entire inspection process takes a lot of time, which not only increases the inspection cost, but also limits the inspection frequency and coverage, making the maintenance and upgrade of the charger difficult.

[0006] Therefore, how to improve the automation level of off-board DC charger detection is a current research direction. Summary of the invention

[0007] (I) Purpose of the invention

[0008] The object of the present invention is to provide a non-vehicle DC charger detection system and detection method which can improve the automation level of non-vehicle DC charger detection and shorten the detection time.

[0009] (II) Technical solution

[0010] In order to solve the above problems, the present invention provides a non-vehicle DC charger detection system, comprising:

[0011] Host computer, three-phase variable power supply, charger tester, load and oscilloscope;

[0012] The host computer is connected to the three-phase variable power supply, the charging pile, the charger tester, the load and the oscilloscope respectively;

[0013] The three-phase variable power supply is connected to the DC charger to be tested, and provides AC power to the DC charger to be tested according to the instruction of the host computer;

[0014] The DC charger to be tested is connected to the charger tester, and the charger tester is used to simulate the entire charging process, simulate faults and collect corresponding electrical parameters;

[0015] The charger tester is connected to the load, and the load is used to simulate the power consumption of the electric vehicle power battery;

[0016] The oscilloscope is connected to the DC charger to be tested, and collects electrical waveform data of the input and output ends of the DC charger to be tested when charging;

[0017] The host computer uses the electrical parameters and electrical waveform data to perform diagnosis.

[0018] In another aspect of the present invention, preferably, the charger tester includes a main control module, a collection module, a communication module, a human-machine module and a fault simulation module;

[0019] The main control module is connected to the acquisition module, the communication module, the man-machine module and the fault simulation module respectively, and is used to control the acquisition module, the communication module, the man-machine module and the fault simulation module;

[0020] The charger tester collects electrical parameters through the collection module;

[0021] The charger tester is connected to the host computer via the communication module;

[0022] The charger tester performs human-machine interaction through the human-machine module;

[0023] The fault simulation module simulates faults in the DC charger to be tested and in the charging process of the electric vehicle.

[0024] In another aspect of the present invention, preferably,

[0025] The fault simulation module includes an auxiliary power supply simulation unit;

[0026] The DC charger to be tested includes an auxiliary power supply function;

[0027] The auxiliary power supply simulation unit simulates the auxiliary power supply failure function of the DC charger to be tested, and the auxiliary power supply simulation unit is used to detect the load capacity of the auxiliary power supply of the DC charger to be tested and the protection capability in case of electrical failure.

[0028] In another aspect of the present invention, preferably,

[0029] The fault simulation module also includes a battery simulation unit;

[0030] The battery simulation unit is used to simulate an electric vehicle battery, and a backflow prevention test is performed on a DC charger to be tested through the battery simulation unit.

[0031] In another aspect of the present invention, preferably,

[0032] The fault simulation module also includes a BMS simulation unit;

[0033] The BMS simulation unit simulates the BMS message communication function of the entire process of electric vehicle charging, and the BMS message communication function of the DC charger to be tested is tested through the BMS simulation unit.

[0034] In another aspect of the present invention, preferably,

[0035] The fault simulation module also includes an insulation resistance unit;

[0036] The insulation resistance unit simulates the insulation state of the outer side of the DC charger to be tested, and the insulation protection function of the DC charger to be tested is tested by the insulation resistance unit.

[0037] In another aspect of the present invention, preferably,

[0038] The fault simulation module also includes a control and guidance unit;

[0039] The control guidance unit simulates CC connection guidance control, and the control guidance unit is used to test the ability to judge whether the DC charger to be tested is effectively connected to the electric vehicle.

[0040] In another aspect of the present invention, preferably, a non-vehicle DC charger detection method is provided, the detection method being applicable to the non-vehicle DC charger detection system as described above, the detection method comprising:

[0041] Set the initial parameters of the DC charger and load to be tested;

[0042] Select the test item and match the selected test item parameters;

[0043] Analyze the test content of the selected test item;

[0044] Conduct testing according to the test content and obtain the test results;

[0045] The DC charger to be tested is diagnosed according to the detection result.

[0046] In another aspect of the present invention, preferably, the analyzing the detection content of the selected detection item also includes:

[0047] Confirm whether the parameters of the selected test items are beyond the range of the test system;

[0048] If it exceeds the detection system range, an abnormal record will be made and the detection items will be reselected;

[0049] If it does not exceed the detection system range, perform a self-check of the detection system to confirm whether the detection system is normal;

[0050] If the detection system is normal, analyze the detection content of the selected detection item;

[0051] If the detection system is abnormal, end this detection.

[0052] In another aspect of the present invention, preferably, performing detection according to the detection content and obtaining the detection result comprises:

[0053] According to the analyzed detection content, the voltage and load of the three-phase variable power supply are adjusted to adjust the charging process and simulate faults;

[0054] The oscilloscope collects electrical waveform data of the DC charger to be tested in real time when charging;

[0055] The charger tester collects electrical parameters in real time;

[0056] A detection result is obtained according to the electrical waveform data and the electrical parameters.

[0057] (III) Beneficial effects

[0058] The above technical solution of the present invention has the following beneficial technical effects:

[0059] The present invention uses the host computer as the control center of the system, which can centrally control the various devices of the detection system. The charger tester and the load jointly simulate the electric vehicle, simulate the entire charging process and faults, so as to detect the fault response and processing capabilities of the DC charger to be tested. This integrated control method not only improves the automation level of non-vehicle DC charger detection, but also greatly shortens the detection time and improves the detection efficiency. By simulating the entire charging process of the electric vehicle and various faults that may be encountered, the electrical data of the entire charging process is collected, and the entire set of charging behaviors of the DC charger to be tested during the charging process are coordinated. This simulation capability can conduct comprehensive testing and verification of the DC charger to be tested without actually connecting to the electric vehicle, ensuring charging safety and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0061] Figure 2 It is a structural schematic diagram of a charger tester according to an embodiment of the present invention;

[0062] Figure 3It is a schematic diagram of the upper computer software interface of an embodiment of the present invention;

[0063] Figure 4 is an overall flow chart of an embodiment of the present invention;

[0064] Figure 5 is a flow chart of the execution of detection items according to an embodiment of the present invention;

[0065] Figure 6 It is a schematic diagram of the detection item principle of an embodiment of the present invention. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0067] The accompanying drawings show schematic diagrams of structures according to embodiments of the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clarity. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0068] Obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0070] The present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale.

[0071] Embodiment 1

[0072] A non-vehicle DC charger detection system, Figure 1 FIG. 1 shows a schematic diagram of the overall structure of an embodiment of the present invention. Figure 1 As shown, including:

[0073] Host computer, three-phase variable power supply, charger tester, load and oscilloscope;

[0074] The host computer is connected to the three-phase variable power supply, charging pile, charger tester, load and oscilloscope respectively; the host computer coordinates and controls the entire process of non-vehicle DC charger detection, including monitoring function, fault diagnosis and alarm function, charging record and data analysis function, human-machine operation function, automatic detection function, etc.

[0075] The three-phase variable power supply is connected to the DC charger to be tested, and provides AC power to the DC charger to be tested according to the instructions of the host computer; the three-phase variable power supply in this embodiment is a programmable three-phase power supply, which is a power supply device that can provide three-phase AC output and has programmable control function. Different voltage, current and frequency outputs are generated according to the host computer software instructions through the network protocol, and the user is allowed to make precise settings and adjustments.

[0076] The DC charger to be tested is connected to the charger tester, and the charger tester is used to simulate the entire charging process, simulate faults and collect corresponding electrical parameters;

[0077] The charger tester is connected to the load, and the load is used to simulate the consumption of electric energy by the electric vehicle power battery; the load in this embodiment is a pure resistive load, which consumes electric energy in the form of heat. The resistance value of the access system is adjusted through the serial network ModleBus protocol. The charger tester and the load jointly simulate the electric vehicle and cooperate with the entire charging behavior of the DC charger to be tested during the charging process.

[0078] The oscilloscope is connected to the DC charger to be tested, and collects electrical waveform data of the input and output ends of the DC charger to be tested when charging; realizes waveform recording and calculation functions of detection items such as voltage and current ripple, charging control timing, and startup input current overshoot, and uploads them to the host computer software for comprehensive diagnosis through the network protocol;

[0079] The host computer uses the electrical parameters and electrical waveform data to perform diagnosis. Figure 3 FIG. 1 shows a schematic diagram of the upper computer software interface of an embodiment of the present invention; Figure 3 As shown in the figure, the host computer software is the control core of the detection system, which controls the whole detection process and realizes the functions of editing, configuring, executing and diagnosing detection items. It includes programmable three-phase power supply monitoring and control module, charger monitoring module, charger detection device monitoring and control module, load monitoring and control module, oscilloscope monitoring and control module, automatic detection full process control and human-computer interaction module.

[0080] Furthermore, in this embodiment, the charger tester includes a main control module, an acquisition module, a communication module, a human-machine module and a fault simulation module; the charger tester simulates the electric vehicle test, various functions, fault simulation, BMS communication, etc. in the whole charging process to realize the detection of charger related functions.

[0081] The main control module is connected to the acquisition module, communication module, human-machine module and fault simulation module respectively, and is used to control the acquisition module, communication module, human-machine module and fault simulation module; the main control module is used to coordinate and control the functions and timing control between the modules of the entire charger tester;

[0082] The charger tester collects electrical parameters through the acquisition module; the electrical parameters here include current and voltage. In this embodiment, the measurement accuracy of voltage and current reaches 0.05%, the voltage measurement range is 50-1000V, and the current measurement range is 5-300A;

[0083] The charger tester is connected to the host computer through the communication module; the host computer software is used to monitor and control the charging process, fault simulation, status monitoring, etc.;

[0084] The charger tester performs human-machine interaction through the human-machine module; parameters and human-machine communication settings can be displayed;

[0085] The fault simulation module simulates faults in the DC charger to be tested and in the charging process of the electric vehicle.

[0086] Further, in this embodiment, the fault simulation module includes an auxiliary power supply simulation unit; the DC charger to be tested includes an auxiliary power supply function; the auxiliary power supply simulation unit simulates the auxiliary power supply fault state of the DC charger to be tested, and the auxiliary power supply simulation unit is used to detect the load capacity of the auxiliary power supply of the DC charger to be tested and the protection capability during electrical faults. The auxiliary power supply simulation unit can not only simulate the auxiliary power supply function of the DC charger to be tested, but also simulate the auxiliary power supply output under different voltage and current conditions. This helps to detect the stability and adaptability of the DC charger to be tested under different load and grid conditions. Through this unit, the output voltage stability, current limiting capability and protection capability of the auxiliary power supply of the DC charger to be tested during load and electrical faults (such as overvoltage, overcurrent, short circuit, etc.) can be detected.

[0087] The fault simulation module also includes a battery simulation unit; the battery simulation unit is used to simulate an electric vehicle battery, and the DC charger to be tested is tested for backflow prevention through the battery simulation unit. The battery simulation unit can not only simulate the basic characteristics of the electric vehicle battery (such as voltage, capacity, etc.), but also simulate the dynamic changes of the battery during the charging process (such as temperature changes, internal resistance changes, etc.). Through this unit, the DC charger to be tested can be tested for backflow prevention to verify whether it can accurately identify and prevent the battery from backflowing to the power grid during the charging process. In addition, different charging states of the battery can also be simulated to detect the charging strategy, charging efficiency and charging safety of the DC charger to be tested.

[0088] The fault simulation module also includes a BMS simulation unit; the BMS simulation unit simulates the BMS message communication function of the entire process of electric vehicle charging, and the BMS message communication function of the DC charger to be tested is tested through the BMS simulation unit. The BMS (battery management system) simulation unit can simulate the BMS message communication function in the entire process of electric vehicle charging, including battery status information, charging requests, charging parameters, etc. Through this unit, the BMS message communication function of the DC charger to be tested can be fully tested, including the compatibility of the communication protocol, the accuracy of the message, the communication speed, and the communication stability. This helps to ensure that the DC charger to be tested can communicate and work well with the BMS of electric vehicles of different brands and models.

[0089] The fault simulation module also includes an insulation resistance unit; the insulation resistance unit simulates the insulation state of the outer side of the DC charger to be tested, and the insulation protection function of the DC charger to be tested is tested through the insulation resistance unit. The insulation resistance unit can simulate the resistance value of the DC charger to be tested under different insulation states, including normal insulation state, insulation reduction state and insulation failure state. Through this unit, it is possible to detect whether the insulation function of the DC charger to be tested is reliable, including the measurement of insulation resistance, the detection of insulation faults, and protection measures in case of insulation faults. This helps to ensure that the DC charger to be tested can maintain good insulation performance during the charging process and prevent electrical accidents.

[0090] The fault simulation module also includes a control guidance unit; the control guidance unit simulates the CC connection guidance control, and the control guidance unit is used to test the judgment ability of the DC charger to be tested and the electric vehicle. The control guidance unit can simulate the CC (charging connection confirmation) connection guidance control process, including the establishment of physical connection, signal transmission, and confirmation of connection status. Through this unit, the judgment ability of the DC charger to be tested when connected to the electric vehicle can be detected, including whether the type of charging interface can be correctly identified, whether the connection status can be accurately judged, and whether the charging process can be started in time. This helps to ensure that the DC charger to be tested can establish a good connection relationship with the electric vehicle during the charging process, and ensure the smooth progress of the charging process.

[0091] The present invention uses the host computer as the control center of the system, which can centrally control the various devices of the detection system. The charger tester and the load jointly simulate the electric vehicle, simulate the entire charging process and faults, so as to detect the fault response and processing capabilities of the DC charger to be tested. This integrated control method not only improves the automation level of non-vehicle DC charger detection, but also greatly shortens the detection time and improves the detection efficiency. By simulating the entire charging process of the electric vehicle and various faults that may be encountered, the electrical data of the entire charging process is collected, and the entire set of charging behaviors of the DC charger to be tested during the charging process are coordinated. This simulation capability helps to conduct comprehensive testing and verification of the DC charger to be tested without actually connecting to the electric vehicle, ensuring charging safety and efficiency.

[0092] Embodiment 2

[0093] A non-vehicle DC charger detection method, the detection method is applicable to the non-vehicle DC charger detection system as described above, Figure 4 is an overall flow chart of an embodiment of the present invention; Figure 4 As shown, the detection method comprises:

[0094] Set the initial parameters of the DC charger and load to be tested: Before starting the test, you need to set the initial parameters of the DC charger and load to be tested. These parameters may include the input voltage range, output power, charging mode, etc. of the charger, as well as the resistance and power of the load.

[0095] Select the test item and match the selected test item parameters; according to the specific model and specifications of the DC charger to be tested, select the corresponding test item from the detection system. The parameters may include test voltage, test current, test time, etc.

[0096] Analyze the test content of the selected test item;

[0097] Conduct testing according to the test content and obtain the test results;

[0098] The DC charger to be tested is diagnosed according to the detection result.

[0099] Furthermore, in this embodiment, the analysis of the detection content of the selected detection item also includes:

[0100] Confirm whether the parameters of the selected test items are beyond the range of the test system;

[0101] If it exceeds the detection system range, an abnormal record will be made and the detection items will be reselected;

[0102] If it does not exceed the detection system range, perform a self-check of the detection system to confirm whether the detection system is normal;

[0103] If the detection system is normal, analyze the detection content of the selected detection item;

[0104] If the detection system is abnormal, end this detection.

[0105] Further, in this embodiment, Figure 5 is a flow chart of the detection items executed in one embodiment of the present invention, such as Figure 5 As shown, the detection is performed according to the detection content to obtain the detection result, including:

[0106] According to the analyzed detection content, the voltage and load of the three-phase variable power supply are adjusted to adjust the charging process and simulate faults;

[0107] The oscilloscope collects electrical waveform data of the DC charger to be tested in real time when charging;

[0108] The charger tester collects electrical parameters in real time;

[0109] A detection result is obtained according to the electrical waveform data and the electrical parameters.

[0110] Among them, when the test item is auxiliary power supply test, auxiliary power supply fault simulation is performed;

[0111] Auxiliary power supply fault simulation includes overvoltage fault, overcurrent fault and short circuit fault;

[0112] Figure 6 FIG. 1 shows a schematic diagram of the principle of the detection items of an embodiment of the present invention, such as Figure 6 As shown, the overvoltage fault includes applying a simulated fault voltage at the detection location, and the simulated fault voltage exceeds a preset voltage safety value;

[0113] Collect the voltage status of the detection position. If the collected voltage is 0V, it is normal; if it is not 0V, it is abnormal;

[0114] like Figure 6A simulated fault voltage (over 12V and configurable) is applied to the outside of A+ and A-; the voltage status of the outside of A+ and A- is collected, and 0V detection is normal.

[0115] Overcurrent faults include inserting a resistor at the detection location to make the current exceed the standard current;

[0116] Collect the voltage status of the detection position. If the collected voltage is 0V, it is normal; if it is not 0V, it is abnormal;

[0117] like Figure 6 Connect resistors to the outside of A+ and A- to make its current exceed the standard current of 10A (the current size can be set); collect the voltage status of the outside of A+ and A-, and 0V detection is normal.

[0118] Short circuit fault includes short circuit at the detection position and automatic disconnection after safety time;

[0119] Collect the voltage status of the detection position. If the collected voltage is 0V, it is normal; if it is not 0V, it is abnormal;

[0120] like Figure 6 The A+ and A- are short-circuited on the outside. To ensure the safety of the appliance, they are automatically disconnected after 20ms. The voltage status of the A+ and A- outsides is collected, and 0V detection is normal.

[0121] When the test item is power supply test, power supply failure simulation is performed;

[0122] The power failure simulation includes controlling the detection voltage of the three-phase variable power supply, and the detection voltage is proportional to the safety voltage;

[0123] Collect the charger output voltage. If the collected voltage is 0V, it is normal. If it is not 0V, it is abnormal.

[0124] Specifically, the standard voltage (phase voltage 220V) value can be adjusted to 115% to simulate input overvoltage, 85% to simulate input undervoltage, and the charger output voltage can be collected. 0V detection is normal.

[0125] When the test item is insulation test, insulation fault simulation is performed;

[0126] Insulation fault simulation includes:

[0127] Resistors of different resistance values ​​are connected at preset positions respectively;

[0128] Start the charger, collect the charging status, and use the electric vehicle charging equipment inspection and test specifications as the basis for judging the test results.

[0129] Specifically, the preset positions include DC+ and ground, DC- and ground, resistors of different resistance values ​​are connected between DC+ and DC-, the charger is started, and the charging status is collected. The charger responds differently to resistance values ​​in different ranges.

[0130] The off-board DC charger detection method of this embodiment can automatically set initial parameters according to the model and specifications of the DC charger to be tested and match the corresponding detection items and their parameters through a preset parameter template or database. Improving the degree of automation and shortening the detection time can significantly improve the detection efficiency and quality.

[0131] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

[0132] In the above description, the technical details of patterning and etching of each layer are not described in detail. However, those skilled in the art should understand that various means in the prior art can be used to form layers, regions, etc. of desired shapes. In addition, in order to form the same structure, those skilled in the art can also design methods that are not completely the same as the methods described above.

[0133] The present invention has been described above with reference to the embodiments of the present invention. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

[0134] Although the embodiments of the present invention have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.

[0135] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A non-vehicle DC charger detection system, characterized in that: include: Host computer, three-phase variable power supply, charger tester, load and oscilloscope; The host computer is connected to the three-phase variable power supply, the charging pile, the charger tester, the load and the oscilloscope respectively; The three-phase variable power supply is connected to the DC charger to be tested, and provides AC power to the DC charger to be tested according to the instruction of the host computer; The DC charger to be tested is connected to the charger tester, and the charger tester is used to simulate the entire charging process, simulate faults and collect corresponding electrical parameters; The charger tester is connected to the load, and the load simulates an electric vehicle power battery and is used to consume electric energy; The oscilloscope is connected to the DC charger to be tested, and collects electrical waveform data of the input and output ends of the DC charger to be tested when charging; The host computer uses the electrical parameters and electrical waveform data to perform diagnosis.

2. The off-vehicle DC charger detection system according to claim 1, characterized in that: The charger tester includes a main control module, an acquisition module, a communication module, a human-machine module and a fault simulation module; The main control module is connected to the acquisition module, the communication module, the man-machine module and the fault simulation module respectively, and is used to control the acquisition module, the communication module, the man-machine module and the fault simulation module; The charger tester collects electrical parameters through the collection module; The charger tester is connected to the host computer via the communication module; The charger tester performs human-machine interaction through the human-machine module; The fault simulation module simulates faults in the DC charger to be tested and in the charging process of the electric vehicle.

3. The off-vehicle DC charger detection system according to claim 1, characterized in that: The fault simulation module includes an auxiliary power supply simulation unit; The DC charger to be tested includes an auxiliary power supply function; The auxiliary power supply simulation unit simulates the auxiliary power supply fault state of the DC charger to be tested, and the auxiliary power supply simulation unit is used to detect the load capacity of the auxiliary power supply of the DC charger to be tested and the protection capability in case of electrical fault.

4. The off-vehicle DC charger detection system according to claim 1, characterized in that: The fault simulation module also includes a battery simulation unit; The battery simulation unit is used to simulate an electric vehicle battery, and a backflow prevention test is performed on a DC charger to be tested through the battery simulation unit.

5. The off-vehicle DC charger detection system according to claim 1, characterized in that: The fault simulation module also includes a BMS simulation unit; The BMS simulation unit simulates the BMS message communication function of the entire process of electric vehicle charging, and the BMS message communication function of the DC charger to be tested is tested through the BMS simulation unit.

6. The off-vehicle DC charger detection system according to claim 1, characterized in that: The fault simulation module also includes an insulation resistance unit; The insulation resistance unit simulates the insulation state of the outer side of the DC charger to be tested, and the insulation protection function of the DC charger to be tested is tested by the insulation resistance unit.

7. The off-vehicle DC charger detection system according to claim 1, characterized in that: The fault simulation module also includes a control and guidance unit; The control guidance unit simulates CC connection guidance control, and the control guidance unit is used to test the ability to judge whether the DC charger to be tested is effectively connected to the electric vehicle.

8. A non-vehicle DC charger detection method, characterized in that: The detection method is applicable to the off-vehicle DC charger detection system according to any one of claims 1 to 7, and the detection method includes: Set the initial parameters of the DC charger and load to be tested; Select the test item and match the selected test item parameters; Analyze the test content of the selected test item; Conduct testing according to the test content and obtain the test results; The DC charger to be tested is diagnosed according to the detection result.

9. The off-vehicle DC charger detection method according to claim 8, characterized in that: The analysis of the detection content of the selected detection item also includes: Confirm whether the parameters of the selected test items are beyond the range of the test system; If it exceeds the detection system range, an abnormal record will be made and the detection items will be reselected; If it does not exceed the detection system range, perform a self-check of the detection system to confirm whether the detection system is normal; If the detection system is normal, analyze the detection content of the selected detection item; If the detection system is abnormal, end this detection.

10. The off-vehicle DC charger detection method according to claim 8, characterized in that: The testing according to the test content and obtaining the test result comprises: According to the analyzed detection content, the voltage and load of the three-phase variable power supply are adjusted to adjust the charging process and simulate faults; The oscilloscope collects electrical waveform data of the DC charger to be tested in real time when charging; The charger tester collects electrical parameters in real time; A detection result is obtained according to the electrical waveform data and the electrical parameters.

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