Electromagnetic compatibility test method, system and device of vehicle-mounted charger and medium

Abstract

The invention discloses an electromagnetic compatibility test method, system and device for a vehicle-mounted charger and a medium, and the method comprises the steps: controlling a signal generation device to generate a control guide signal when a compatibility test instruction is received, so as to control an AC power supply to charge a to-be-tested sample through the control guide signal; the AC line impedance network comprises a plurality of test ports; acquiring test configuration parameters of the test receiver; when each test port in the plurality of test ports of the AC line impedance network is connected with the test receiver, controlling the test receiver to measure the conducted emission of the corresponding phase line of the test port according to the test configuration parameter to obtain the measurement result of each test port; and analyzing the measurement result of each test port to obtain a test result. According to the technical scheme, the conducted interference test result of the whole vehicle level can be simulated through the test method of the vehicle-mounted charger of the component level, the test research and development period is shortened, and the electromagnetic compatibility test efficiency is improved.

Description

Technical Field

[0001] The present invention generally relates to the technical field of electromagnetic compatibility testing, and in particular to an electromagnetic compatibility testing method, system, device and medium for a vehicle charger. Background Art

[0002] With the continuous development of automobile technology, electric vehicles have been increasingly used in people's daily lives. As an important core component of electric vehicles, on-board chargers are installed in electric vehicles. They are an electric energy conversion device that can convert external AC power into the DC power required by electric vehicles. However, during the charging and discharging process of electric vehicles, their battery management systems, motor control systems and other electronic and electrical equipment will generate complex electromagnetic interference, which will not only affect the normal operation of the electric vehicle's own electronic and electrical equipment, but may also have adverse effects on the surrounding environment and equipment. In order to improve the charging efficiency of electric vehicles and ensure the safety and stability of electric vehicles during the charging and discharging process, it is particularly important to conduct electromagnetic compatibility testing on the performance of on-board chargers.

[0003] At present, the relevant technology tests the electromagnetic compatibility of electric vehicle conduction charging according to the preset test standards, and evaluates the electromagnetic compatibility of electric vehicles by measuring the electromagnetic radiation level of electric vehicles under specific working conditions. However, this solution takes a lot of time, shortens the research and development cycle, and leads to low efficiency of electromagnetic compatibility testing. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an electromagnetic compatibility test method, system, device and medium for a vehicle charger.

[0005] In a first aspect, the present invention provides a method for evaluating ground plane radiation field strength, the method comprising: When receiving a compatible test instruction, the control signal generating device generates a control guide signal to control the AC power supply to charge the sample to be tested through the control guide signal; the sample to be tested is connected to the signal generating device, and the sample to be tested is connected to the AC power supply through an AC line impedance network; the AC line impedance network includes a plurality of test ports; Acquire test configuration parameters of the test receiver; the test configuration parameters include: test frequency range, test bandwidth, test step length, detector type, quasi-peak threshold, and average value threshold; When each of the multiple test ports of the AC line impedance network is connected to a test receiver, the test receiver is controlled to measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters to obtain the measurement results of each test port; The measurement results of each test port are analyzed to obtain a test result.

[0006] In one embodiment, measuring the conducted emission of the phase line corresponding to the test port according to the test configuration parameters to obtain the measurement results of each test port includes: Record the quasi-peak value and average value corresponding to each test frequency point within the test frequency range; the test frequency range includes multiple test frequency bands, and each test frequency band corresponds to a quasi-peak value and an average value; Performing line loss compensation processing on the quasi-peak value and the average value to obtain a compensated quasi-peak value and a compensated average value; Determine whether the compensated quasi-peak value is greater than a quasi-peak value threshold corresponding to the test frequency band where the quasi-peak value is located, and determine whether the compensated average value is greater than an average value threshold corresponding to the test frequency band where the average value is located; When the compensated quasi-peak value is not greater than the quasi-peak value threshold or the compensated average value is not greater than the average value threshold, the measurement result of the test port is obtained.

[0007] In one embodiment, performing line loss compensation processing on the quasi-peak value and the average value to obtain the compensated quasi-peak value and the compensated average value includes: Obtaining line loss values ​​at each test frequency point within the test frequency range; The compensated quasi-peak value and the compensated average value are calculated according to the line loss values ​​of the respective test frequency bands, the quasi-peak value and the average value corresponding to the respective test frequency points.

[0008] In one embodiment, obtaining the line loss value of each test frequency point within the test frequency range includes: Obtaining benchmark test parameters; the benchmark test parameters include test configuration parameters and signal output parameters, and the signal output parameters include: signal output values; When the signal generator is connected to the test receiver via a reference line, the reference line is tested according to the reference test parameters to obtain a reference line measurement result; When the signal generator is connected to the test receiver through the line under test, the line under test is tested according to the reference test parameters to obtain a measurement result of the line under test; Based on the baseline measurement result and the measured line measurement result, a line loss value within the test frequency range is determined.

[0009] In one embodiment, after determining whether the compensated quasi-peak value is greater than a quasi-peak value threshold corresponding to a test frequency band where the quasi-peak value is located, and determining whether the compensated average value is greater than an average value threshold corresponding to a test frequency band where the average value is located, the method further includes: When the compensated quasi-peak value is greater than the quasi-peak value threshold corresponding to the test frequency band where the quasi-peak value is located, re-perform the rectification test until the measurement result output condition is met to obtain the measurement result of the test port; or, When the compensated average value is greater than the average value threshold corresponding to the test frequency band where the average value is located, the rectification test is re-executed until the measurement result output condition is met to obtain the measurement result of the test port.

[0010] In one embodiment, analyzing the measurement results of each test port to obtain the test results includes: When the measurement results of each test port meet the corresponding limit range, determine that the test result is a test pass; When at least one of the measurement results of the test ports does not satisfy the corresponding restriction range, the test result is determined to be a test failure.

[0011] In a second aspect, an embodiment of the present application provides a ground plane radiation field strength assessment system, the system comprising: a main control device, a signal generating device, an AC line impedance network, and a test receiver; the main control device establishes a communication connection with the signal generating device and the test receiver respectively; the sample to be tested is connected to an AC power source through the AC line impedance network, the sample to be tested is connected to the signal generator, the AC line impedance network comprises a plurality of test ports, and the AC line impedance network is connected to the test receiver through the test port; The main control device is used to: obtain the test configuration parameters of the test receiver, and generate control instructions according to the test configuration parameters and send them to the test receiver; the test configuration parameters include: test frequency range, test bandwidth, test step size, detector type, quasi-peak threshold, average value threshold; the AC line impedance network includes multiple test ports; The signal generating device is used to: generate a control guide signal to enable the sample to be tested to perform a charging operation; The test receiver is used to: receive and respond to the control instruction, measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters, obtain the measurement results of each test port and send them to the main control device; The main control device is also used to analyze the measurement results of each test port to obtain the test results.

[0012] In a third aspect, an embodiment of the present application provides a main control device, 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 provided in the above embodiment.

[0013] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method provided in the above embodiment is implemented.

[0014] The electromagnetic compatibility test method, system, device and medium of the on-board charger provided in the embodiment of the present application include: when receiving a compatibility test instruction, the control signal generating device generates a control guide signal to control the charging of the sample to be tested through the control guide signal; the sample to be tested is connected to the signal generating device, and the sample to be tested is connected to the AC power supply through the AC line impedance network; the AC line impedance network includes multiple test ports; the test configuration parameters of the test receiver are obtained; the test configuration parameters include: test frequency range, test bandwidth, test step size, detector type, quasi-peak threshold, average value threshold; when each of the multiple test ports of the AC line impedance network is respectively connected to the test receiver, the test receiver is controlled to measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters to obtain the measurement results of each test port; the measurement results of each test port are analyzed to obtain the test results. Compared with the prior art, this technical solution controls the charging of the sample to be tested through a guide signal, thereby ensuring the safety and reliability of the charging process of the sample to be tested. While ensuring safety, the sample to be tested is connected to the AC power supply through an AC line impedance network, which can isolate external interference and accurately detect the interference signal emitted by the sample to be tested during the charging process, so that the conduction test results at the vehicle level can be simulated through the test method of the on-board charger at the component level; by combining the information of the test configuration parameters, it is convenient to accurately measure the conducted emission of the phase line corresponding to the test port, so as to obtain more accurate measurement results, and then analyze the measurement results of each test port, which improves the accuracy of the test result determination, helps to evaluate the electromagnetic compatibility performance of the on-board charger in advance, facilitates the timely discovery and resolution of electromagnetic interference problems, shortens the test development cycle, improves the efficiency of electromagnetic compatibility testing, and further ensures the safety and reliability of electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram of the front view of the conducted interference test system at the vehicle level provided in an embodiment of the present application; Figure 2 A schematic diagram of the top view of the conducted interference test system at the vehicle level provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of an electromagnetic compatibility test system for a vehicle charger provided in one embodiment of the present application; Figure 4 A schematic diagram of the structure of an electromagnetic compatibility test system for a vehicle charger provided in another embodiment of the present application; Figure 5 A flow chart of an electromagnetic compatibility test method for a vehicle charger provided in an embodiment of the present application; Figure 6 A flow chart of a method for measuring the conducted emission of a phase line corresponding to a test port to obtain measurement results of each test port provided in an embodiment of the present application; Figure 7 A schematic diagram of a flow chart of a method for determining a line loss value within a test frequency range provided in an embodiment of the present application; Figure 8 A schematic diagram of the structure of an electromagnetic compatibility test device for a vehicle charger provided in an embodiment of the present application; Fig. 9 A schematic diagram of the internal structure of the main control device provided in an embodiment of the present application; Description of Reference Numerals Electric vehicle-1, insulation support-2, charging cable-3, power network-4, simulated AC charging pile-5, measurement receiver-6; signal generating device-10; test chamber-11; signal generator-12; grounding copper table-13; sample to be tested-14; charging gun-15; main control device-20; AV LISN-30; test receiver-40; AC power supply-50; HV power supply-60; HV LISN-61; low voltage power supply-70; LV LISN-71; DCDC load-72; resistance load-73. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] See also Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the front view of the conducted interference test system at the vehicle level provided in an embodiment of the present application. Figure 2The schematic diagram of the top view of the conducted interference test system at the vehicle level provided in the embodiment of the present application includes an electric vehicle 1, an insulating support 2, a charging cable 3, a power network 4, a simulated AC charging pile 5, and a measurement receiver 6. The electric vehicle 1 is connected to one end of the power network 4 through the charging cable 3 via a charging gun, and the other end of the power network 4 is connected to the simulated AC charging pile 5. The output port of the power network 4 is also connected to the measurement receiver via a coaxial cable.

[0019] The power supply network 4 may be an AC LISN. The thickness of the insulating support 2 may be set to 10 cm to ensure that the charging gun or charging cable maintains a certain insulation distance from the ground or other conductive surfaces to avoid unnecessary grounding paths affecting the test results.

[0020] During the test, the test frequency range, scanning speed, resolution bandwidth and other parameters can be determined according to the preset road vehicle-electrical / electronic components and systems immunity test standard to narrowband radiated electromagnetic energy, and the RF conducted emissions on different phase lines and the neutral line (N) can be tested according to the test frequency range, scanning speed, resolution bandwidth and other parameters to obtain the test results.

[0021] In this application, in order to ensure that the on-board charger has better electromagnetic compatibility in future production and use, discover and solve potential problems in advance, and reduce the failure rate of products in the market, the conducted interference test of the on-board charger at the component level can be used to simulate the conducted interference test at the vehicle level to reduce the interference of the on-board charger to other electronic equipment in the vehicle and improve the user experience.

[0022] The electromagnetic compatibility test system of a vehicle charger provided in the embodiment of the present application can be found in Figure 3 As shown. The electromagnetic compatibility test system of the on-board charger includes a main control device 20, a signal generating device 10, an AC line impedance network (AV LISN30), and a test receiver 40; the main control device 20 establishes communication connections with the signal generating device 10 and the test receiver 40 respectively; the sample to be tested 14 is connected to the AC power source 50 through the AV LISN30, the sample to be tested 14 is connected to the signal generator 12, the AV LISN30 includes a plurality of test ports, and the AV LISN30 is connected to the test receiver 40 through the test ports.

[0023] The main control device 20 is used to obtain the test configuration parameters of the test receiver 40, and generate control instructions according to the test configuration parameters and send them to the test receiver; the test configuration parameters include: test frequency range, test bandwidth, test step size, detector type, quasi-peak threshold, average value threshold; the AC line impedance network includes multiple test ports. The signal generating device 10 is used to generate a control guide signal to enable the sample to be tested to perform a charging operation. The test receiver 40 is used to receive and respond to the control instruction, measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters, obtain the measurement results of each test port and send them to the main control device. The main control device 20 is also used to analyze the measurement results of each test port to obtain the test results.

[0024] The above-mentioned sample to be tested 14 can be a vehicle-mounted charger, and the sample to be tested can be connected to the AC power source 50 through the charging gun 15. During the electromagnetic compatibility test of the vehicle-mounted charger, the signal generating device 10 is used to generate a control guide signal (CP signal) to control the charging operation of the sample to be tested 14. The charging gun 15 is used to charge the electric vehicle. Among them, the CP signal can be composed of a square wave of ±12V and a duty cycle of 50%.

[0025] The main control device 20 has data control and data processing functions, and may include a computer device, which may include a terminal for establishing a communication connection between the server and the server. The main control device 20 may be configured with EMC 32 test software, which is used to control the entire test process, including the processing of collected data and the analysis of results, and is also responsible for recording test conditions and results and generating reports that meet specifications.

[0026] Optionally, the server may be a single server, or a server cluster or distributed system composed of several servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content delivery networks (CDN), and big data and artificial intelligence platforms. An operating system may be running on the above-mentioned terminal, and the operating system may include but is not limited to Android system, IOS system, Linux system, Unix, Windows system, etc., and may also include a user interface (UI) layer, which may provide data display to the outside through the UI layer. In addition, a first control instruction may be sent to the signal generating device 10 based on an application programming interface (API), so that the signal generating device 10 receives and responds to the first control instruction and performs a corresponding operation; and is also used to send a second control instruction to the test receiver 40, so that the test receiver 40 receives and responds to the second control instruction and performs a corresponding operation.

[0027] Among them, the server and terminal can be equipped with a microprocessor (MCU), memory (ROM, RAM), input and output interface (I / O), analog-to-digital converter (A / D), and large-scale integrated circuits such as shaping and driving.

[0028] The AC line impedance network, also known as the AC LISN (Line Impedance Stabilization Network), is a network used to stabilize the impedance of the AC line and provide a measurement point to detect interference signals emitted from the device under test. In the power system, the AC LISN is mainly used to measure the input impedance of the device to ensure the accuracy of the measurement results. The AC LISN includes test ports, each of which corresponds to a phase line, for example, it may include an L1 test port, an L2 test port, an L3 test port, and an N test port. The L1 test port corresponds to the first phase line L1, the L2 test port corresponds to the second phase line L2, the L3 test port corresponds to the third phase line L3, and the N test port corresponds to the neutral line N. In the process of performing a compatibility test on the on-board charger, each test port of the AC line impedance network may be connected to the test receiver in turn to obtain interference information.

[0029] The test receiver 40 is used to analyze and record the electromagnetic interference signal transmitted by the AV LISN 30 , measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters, obtain the measurement result of each test port and send it to the main control device 20 .

[0030] The main control device 20 is used to analyze the measurement results of each test port after receiving them to obtain the test results.

[0031] AC power 50, also known as AV power, is a form of electricity in which the direction of the current changes periodically. For electric vehicles, AC power is usually used for charging services provided by charging stations. Household sockets usually provide AC power, which can be used to charge electric vehicles through appropriate chargers. AC charging is generally divided into single-phase (such as household 220V / 110V) and three-phase (industrial electricity 380V / 400V, etc.).

[0032] In this embodiment, by connecting the sample under test to the AC LISN through the charging gun, and then connecting the AC LISN to the AC power supply, all potential RF noise from the vehicle must pass through the AC LISN, so that the interference signal can be accurately captured and measured. In addition, by setting up the AC LISN, it is convenient to provide a stable power supply impedance for the sample under test (EUT) during the test process, while isolating the interference from the power supply side, and can couple the interference signal generated by the device under test to the test receiver, so as to accurately measure the interference signal.

[0033] In one embodiment, see Figure 4 As shown, the signal generating device 10 comprises: a test chamber 11, a signal generator 12, and a grounded copper table 13; the signal generator 12 is located inside the test chamber 11; the sample 14 to be tested and the charging gun 15 are placed on the grounded copper table 13, the grounding end of the AV LISN 30 is grounded to the ground metal structure of the test chamber 11, and the signal generator 12 is grounded to the ground metal structure of the test chamber 11; The signal generator 12 is used to generate a control guide CP signal to control the charging operation of the sample 14 to be tested.

[0034] It can be understood that, taking the sample to be tested as an on-board charger as an example, the on-board charger is connected to the AC LISN through a charging gun, and the AC LISN is connected to the AC power supply. When the charging gun is tested, a CP signal needs to be provided to ensure normal charging. Therefore, a signal generator needs to be set up. The signal generator can be a CP signal generator for generating a CP signal. The CP signal consists of a square wave of ±12V and a duty cycle of 50%.

[0035] The AC LISN 30, the sample to be tested 14, and the signal generator 12 are all in the test chamber. The test chamber 11 can be a darkroom, which can be understood as a shielded chamber with a large size and a highly conductive reflective wall. The shielded chamber is affixed with ferrite and absorbing foam to absorb electromagnetic waves and reduce the reflection of electromagnetic waves.

[0036] The grounded copper table 13 is a test auxiliary equipment, which is used to provide a stable ground reference plane for the test process of the sample to be tested, so that the test conditions are more consistent and controllable. The grounded copper table 13 can usually be made of a metal material with good conductivity, such as a copper or aluminum plate, and its size should be large enough, such as a wooden table, on which a copper plate is laid, and the copper plate is directly connected to the wall of the semi-anechoic chamber through a grounding belt to achieve complete grounding of the test copper table. The size of the copper plate needs to be 20 cm larger than the maximum size of the system under test on each side. An insulating support with a thickness of 10 cm (relative dielectric constant less than 1.4) is laid above the copper plate to support the wiring harness and sample to be tested. The above-mentioned wooden table can be at a certain distance from the ground. The choice of this distance depends on the requirements of the test standard. For example, it can be 90 cm. Some standards may stipulate that measurements should be made at a distance of 1 meter, 3 meters or 10 meters.

[0037] Optionally, the system may further include an HV power supply 60, an HV LISN 61, a low voltage power supply 70, an LV LISN 71, a DCDC load 72, and a resistive load 73. The test sample 14 (EUT) is connected to the resistive load 73, and is connected to the HV power supply 60 through the HV LISN 61, and is also connected to the low voltage power supply 70 and the DCDC load 72 through the LV LISN 71.

[0038] It should be noted that the above-mentioned HV LISN61 (high-voltage line impedance stabilization network) is mainly used for electromagnetic compatibility testing of high-voltage systems. In systems containing high-voltage components such as electric vehicles, such as high-voltage battery systems, high-voltage motor drive systems, etc., it can simulate the impedance characteristics of the actual power grid, provide a standard power interface for high-voltage components, and extract the high-frequency interference signals generated by high-voltage components for measurement. The operating voltage range of HV LISN61 is usually high, generally reaching several hundred volts or even higher to meet the needs of high-voltage systems. For example, in the test of the high-voltage battery system of an electric vehicle, the operating voltage may reach about 300-400V. Its impedance characteristics are generally designed in accordance with relevant electromagnetic compatibility standards, such as providing a stable 50Ω or 100Ω power impedance within a specific frequency range (e.g. 150kHz-30MHz).

[0039] LV LISN71 (Low Voltage Line Impedance Stabilization Network) is mainly used for electromagnetic compatibility testing of low voltage systems. In automotive electronic systems, there are many low voltage components, such as body control modules, in-vehicle entertainment systems, etc. The operating voltage of these components is generally low (usually around 12V-24V). LV LISN71 is used to provide stable power supply impedance for these low voltage components, and couple the interference signals generated by them, so as to facilitate the electromagnetic compatibility testing of these low voltage components. Its typical parameters and working range are that the working voltage range of LV LISN is generally low, which is suitable for 12V or 24V automotive low voltage electrical systems. It also provides standard power supply impedance, such as about 50Ω, within a certain frequency range (such as 150kHz -30MHz) to ensure the accuracy and consistency of the test. It can effectively isolate the interference on the power supply side, so that testers can accurately measure the electromagnetic interference signals generated by the low voltage components themselves.

[0040] HV power supply 60 (high voltage power supply), in electric vehicles, the high voltage system generally refers to the operating voltage of the battery pack and related high voltage components (such as motors, inverters, etc.), which are much higher than the traditional 12V automotive electrical system. It is mainly used to drive high power demand components such as electric vehicles and air conditioning compressors.

[0041] AC power 50 source usually refers to the external AC power supply used to charge electric vehicles, while HV power 60 involves the high voltage system inside the vehicle. Low voltage power (LV) usually refers to the traditional 12v or 24V electrical system. The low voltage power system is mainly used to support various auxiliary functions and electronic equipment of the vehicle. The low voltage power system is responsible for powering the auxiliary systems and non-power systems of the vehicle, such as lighting, audio, air conditioning control system, dashboard, airbags, ABS (anti-lock braking system), electronic control units (ECUs), infotainment system, etc.

[0042] DCDC load 72 generally refers to electronic devices and systems that are actually connected to the output of the DCDC converter. These devices may include but are not limited to all components in a 12V or 24V low-voltage electrical system, such as vehicle lights, audio systems, control units, etc. These loads may be nonlinear and have complex electrical characteristics. The resistive load 73 is an ideal, linear load model that is often used in testing and simulation. The resistive load may include one or more resistors.

[0043] During the component-level conducted interference test, in order to make the test results closer to the test results of the conducted interference of the whole vehicle, the wiring harnesses used in the test process are all original wiring harnesses in the whole vehicle. The low-voltage line LV of the sample to be tested is connected to the low-voltage power supply through the LVLISN, and the high-voltage line HV of the sample to be tested is connected to the HV power supply through the HV LISN. The charging gun of the sample to be tested is connected to the AC LISN and connected to the AC power supply to supply 380V to the sample to be tested. The receiving port of the test receiver and the AC LISN test port are connected via a coaxial cable. Taking the test receiver as an EMI test receiver as an example, the above-mentioned test receiver is configured with EMC 32 software, and the test configuration parameters of the EMI test receiver can be configured through the EMC 32 software. The test configuration parameters may include, for example, the test frequency range, detector type, dwell time, test bandwidth, etc., limit values, etc.

[0044] Taking the AC LISN including four test ports as an example, after connecting the test ports of the AC LISN to the test receiver in turn and performing the test according to the test configuration parameters, the RF conducted emission characteristic data on different phase lines (L1, L2, L3) and the neutral line (N) will be obtained, which are marked as CEV-AC-L1, CEV-AC-L2, CEV-AC-L3 and CEV-AC-N.

[0045] The electromagnetic compatibility test system of the on-board charger provided in this embodiment includes a signal generating device, a main control device, an AC line impedance network, and a test receiver. The technical solution controls the charging of the sample to be tested through a guide signal, thereby ensuring the safety and reliability of the sample to be tested during the charging process. Under the condition of ensuring safety, the sample to be tested is connected to the AC power supply through the AC line impedance network, and external interference can be isolated. The interference signal emitted by the sample to be tested during the charging process is accurately detected, so that the conduction test result at the vehicle level can be simulated by the test method of the on-board charger at the component level; by combining the information of the test configuration parameters, it is convenient to accurately measure the conducted emission of the phase line corresponding to the test port, so as to obtain more accurate measurement results, and then analyze the measurement results of each test port, thereby improving the accuracy of the test result determination, helping to evaluate the electromagnetic compatibility performance of the on-board charger in advance, facilitating the timely discovery and resolution of electromagnetic interference problems, shortening the test development cycle, improving the efficiency of electromagnetic compatibility testing, and further ensuring the safety and reliability of electric vehicles.

[0046] In an exemplary embodiment, Figure 5 As shown, a method for testing electromagnetic compatibility of a vehicle charger is provided. The method is executed by a main control device, and can be executed by a computer device such as a terminal or a server alone, or by a terminal and a server together. In the embodiment of the present application, the method is applied to Figure 3 The main control device 20 in the embodiment is taken as an example to illustrate, and the method includes the following steps S201 to S204. Among them: Step S201, when receiving a compatible test instruction, the control signal generating device generates a control guide signal to control the AC power supply to charge the sample to be tested through the control guide signal; the sample to be tested is connected to the signal generating device, and the sample to be tested is connected to the AC power supply through an AC line impedance network; the AC line impedance network includes multiple test ports.

[0047] It should be noted that when the on-board charger needs to be tested for electromagnetic compatibility, the sample to be tested is connected to the signal generating device through the charging gun, the sample to be tested is connected to the AC power supply through the AC LSIN, and the receiving port of the test receiver is connected to the test port of the AC LSIN through a coaxial cable. The test receiver is configured with EMC 32 software. The user can perform input operations to send a compatible test instruction to the main control device, so that the main control device receives the compatible test instruction, and then controls the signal generator in the signal generating device to generate a CP signal, and controls the AC power supply to charge the sample to be tested through the CP signal.

[0048] Among them, in the electric vehicle charging system, the CP signal is a control signal. It is mainly used to control the charging process and is a communication signal connecting the electric vehicle and the charging pile. For example, the CP signal allows information exchange between the vehicle and the charging pile, including the adjustment of the charging power, the feedback of the charging status and many other important charging-related information. The CP signal is composed of a square wave of ±12V and a duty cycle of 50%. The square wave signal is a non-sinusoidal signal whose voltage switches rapidly between two fixed levels. A duty cycle of 50% means that the high level time and the low level time are equal in one cycle of the signal. This specific voltage amplitude and duty cycle CP signal provides the necessary control information for the charging gun to ensure that charging can proceed normally according to the specified requirements.

[0049] Step S202, obtaining test configuration parameters of the test receiver; the test configuration parameters include: test frequency range, test bandwidth, test step length, detector type, quasi-peak threshold, and average value threshold.

[0050] It should be noted that the above test frequency range, test bandwidth, test step, detector type, quasi-peak threshold, and average value threshold can be customized according to actual needs. The test frequency range refers to the frequency range that needs to be tested, for example, it can be 0.15MHz-30MHz. The test bandwidth refers to the bandwidth used by the test system when measuring within a certain test frequency band, for example, it can be 9kHz. The test step refers to the amplitude of each frequency change when performing a frequency scan, for example, it can be 5kHz. The detector type can include a peak detector and an average detector.

[0051] Optionally, the above test configuration parameters can be imported from an external device, obtained through a database or blockchain, or customized according to actual needs. In this embodiment, there is no limitation on the method of obtaining the test configuration parameters. Among them, the above test frequency range includes multiple test frequency bands or one test frequency band, and the multiple test frequency bands can include 0.15~0.5MHz, 0.5~5MHz, 5~30MHz, each test frequency band can correspond to a quasi-peak threshold, an average value threshold and a detector type, and a test frequency band can correspond to a quasi-peak threshold, an average value threshold and a detector type. The test configuration parameters can be shown in Table 1 below: Table 1

[0052] The above thresholds include a quasi-peak threshold and an average threshold.

[0053] Step S203, when each of the multiple test ports of the AC line impedance network is connected to the test receiver, the test receiver is controlled to measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters to obtain the measurement results of each test port.

[0054] Specifically, after obtaining the test configuration parameters, the test receiver can be controlled to perform test parameter configuration, the test frequency range is set to 0.15MHz-30MHz, the test bandwidth is set to 9kHz, the test step is set to 5kHz, the detector type is set to peak detector and average detector, and the threshold is set to the corresponding peak limit and average threshold as shown in Table 1.

[0055] Take the on-board charger as an example. The on-board charger is connected to the CP signal generator through the tested wiring harness and charging gun. The charging gun is also connected to the AC power supply through the AC line impedance network. The sample to be tested is connected to the low-voltage power supply through the LV LISN and the HV power supply through the HV LISN. The sample to be tested is also connected to the DCDC load through the LV LISN and the resistance load. In order to simulate the whole vehicle test state as much as possible, the sample to be tested, the DCDC load, the LV LISN, and the HV LISN are all grounded to the test copper table. The grounding terminal of the AC LISN is grounded to the metal structure of the darkroom floor, and the CP signal generator is grounded to the metal structure of the darkroom floor.

[0056] In another exemplary embodiment of the present application, in order to accurately determine the evaluation result, the conducted emission of the phase line corresponding to the test port can be measured according to the test configuration parameters to obtain the measurement results of each test port, such as Figure 6 As shown, the above step 203 is replaced by the following steps S301 to S304: Step S301, recording the quasi-peak value and average value corresponding to each test frequency point in the test frequency range; the test frequency range includes multiple test frequency bands, and each test frequency band corresponds to a quasi-peak value and an average value.

[0057] Step S302 , performing line loss compensation processing on the quasi-peak value and the average value to obtain a compensated quasi-peak value and a compensated average value.

[0058] Step S303, determining whether the compensated quasi-peak value is greater than the quasi-peak value threshold corresponding to the test frequency band where the quasi-peak value is located, and determining whether the compensated average value is greater than the average value threshold corresponding to the test frequency band where the average value is located.

[0059] Step S304: when the compensated quasi-peak value is not greater than the quasi-peak value threshold or the compensated average value is not greater than the average value threshold, a measurement result of the test port is obtained.

[0060] After establishing connections between the components in the electromagnetic compatibility test system of the on-board charger, test each test port of the AC LISN. The AC LISN has four test ports, namely, L1 test port, L2 test port, L3 test port, and N test port. First, connect the L1 test port of the AC LISN to the signal receiver through a coaxial cable, and set the LISNSELECTION key to the corresponding port. Use the EMC 32 software to set the test configuration parameters corresponding to the test receiver, and then start measuring the conducted emission of the L1 phase line corresponding to the L1 test port, and record the quasi-peak value and average value corresponding to each test frequency point of the L1 test port within the test frequency range.

[0061] It is understandable that the coaxial cable or other connecting cables used in the test process will have a certain signal attenuation, which can be understood as line loss. In order to ensure the accuracy of the test results, line loss compensation is required, which can more accurately reflect the electromagnetic emission characteristics of the sample to be tested under actual use conditions, thereby ensuring the authenticity and reliability of the test results.

[0062] After obtaining the quasi-peak value and the average value, line loss compensation is performed on the quasi-peak value and the average value to obtain the compensated quasi-peak value and the compensated average value, which may include: obtaining the line loss value of each test frequency point within the test frequency range; calculating the compensated quasi-peak value and the compensated average value according to the line loss value of each test frequency band and the quasi-peak value and the average value corresponding to each test frequency point.

[0063] After obtaining the compensated quasi-peak value and the compensated average value, the corresponding test frequency band can be determined according to the quasi-peak value, and then the corresponding quasi-peak threshold and average value threshold can be determined according to the test frequency band. The compensated quasi-peak value is compared with the corresponding quasi-peak threshold to determine whether the compensated quasi-peak value is greater than the quasi-peak threshold corresponding to the test frequency band where the quasi-peak value is located. When the compensated quasi-peak value is not greater than the quasi-peak threshold, it is determined to be pass, and the measurement result of the L1 test port is obtained; and the compensated average value is compared with the corresponding average value threshold to determine whether the compensated average value is greater than the average value threshold corresponding to the test frequency band where the average value is located; when the compensated average value is not greater than the average value threshold, it is determined to be pass, and the measurement result of the L1 test port is obtained.

[0064] When the quasi-peak value after compensation is greater than the quasi-peak value threshold corresponding to the test frequency band where the quasi-peak value of the test port is located, it is judged as fail, and the rectification test is re-executed until the measurement result output condition is met to obtain the measurement result of the test port; or, when the average value after compensation is greater than the average value threshold corresponding to the test frequency band where the average value of the test port is located, the rectification test is re-executed until the measurement result output condition is met to obtain the measurement result CEV-AC-L1 of the L1 test port. Among them, the measurement result output condition can be that the quasi-peak value after compensation is greater than the quasi-peak value threshold corresponding to the test frequency band where the quasi-peak value of the test port is located, or that the average value after compensation is greater than the average value threshold corresponding to the test frequency band where the quasi-peak value of the test port is located.

[0065] After determining the measurement result of the L1 test port, the L2 test port of the AC LISN can be connected to the signal receiver through the coaxial cable, and the LISN SELECTION key can be turned to the corresponding port. Use the EMC 32 software to set the test configuration parameters corresponding to the test receiver, and then start measuring the conducted emission of the L2 phase line corresponding to the L2 test port, and record the quasi-peak value and average value corresponding to each test frequency point of the L2 test port within the test frequency range. Similarly, similar to the method of the L1 test port, the measurement result CEV-AC-L2 of the L2 test port is obtained; after determining the measurement result of the L2 test port, the L3 test port and test port N of the AC LISN can be connected to the signal receiver through the coaxial cable in turn, and the LISN SELECTION key can be turned to the corresponding port, so as to measure the conducted emission of the L2 phase line corresponding to the L3 test port respectively, and obtain the measurement result CEV-AC-L3 of the L3 test port; and measure the conducted emission of the neutral line N corresponding to the N test port, and obtain the measurement result CEV-AC-N of the N test port.

[0066] It can be understood that CEV-AC-L1, CEV-AC-L2, CEV-AC-L3 and CEV-AC-N generally refer to the RF conducted emission characteristics measured along the AC power line. Each parameter corresponds to a different part of the three-phase AC system: CEV-AC-L1: represents the RF conducted emission value on the first phase (L1). This refers to the electromagnetic interference level measured on the L1 phase line. CEV-AC-L2: represents the RF conducted emission value on the second phase (L2). This refers to the electromagnetic interference level measured on the L2 phase line. CEV-AC-L3: represents the RF conducted emission value on the third phase (L3). This refers to the electromagnetic interference level measured on the L3 phase line. CEV-AC-N: represents the RF conducted emission value on the neutral line (Neutral, N), which refers to the electromagnetic interference level measured on the neutral line.

[0067] These parameters are used to evaluate whether electric vehicles and their charging systems comply with relevant electromagnetic compatibility standards, especially whether the radio frequency interference generated during the charging process is controlled within an acceptable range. The test results can help manufacturers ensure that their products will not cause interference to other electronic devices around them, and also ensure that the electric vehicles themselves will not be adversely affected by external electromagnetic fields. Tests are usually performed within a specific frequency range to cover all frequency points that may cause problems. These terms are usually used to describe the magnitude of electromagnetic interference conducted through the power line.

[0068] In one of the embodiments, a specific implementation method for obtaining the line loss value of each test frequency point within the test frequency range is also provided. Figure 7 As shown, the method includes: Step S401, obtaining benchmark test parameters; the benchmark test parameters include test configuration parameters and signal output parameters, and the signal output parameters include: signal output values.

[0069] Step S402: When the signal generator is connected to the test receiver via a reference line, the reference line is tested according to the reference test parameters to obtain a reference line measurement result.

[0070] Step S403: When the signal generator is connected to the test receiver through the tested line, the tested line is tested according to the reference test parameters to obtain the measured result of the tested line.

[0071] Step S404: determining the line loss value within the test frequency range based on the baseline line measurement result and the measured line measurement result.

[0072] Understandably, cable loss measurement is an important step in electromagnetic compatibility (EMC) testing, especially when using long coaxial or other types of cables. Cable loss affects the accuracy of test results, so it needs to be measured and compensated in the formal test.

[0073] In the process of determining the line loss value within the test frequency range, the baseline measurement can be performed first, the signal generator and the test receiver are directly connected through the baseline, which is usually a short and high-quality coaxial line, and then the calibration file is configured in the EMC32 software of the signal tester. By opening the EMC32 software, the corresponding calibration file is loaded, and the benchmark test parameters are set. The benchmark test parameters include: the starting frequency is 0.15MHz, the end frequency is 30MHz, the test bandwidth is set to 9kHz, the test step is set to 5kHz, and the signal generator output is set to -30dBm. Then click Start in the EMC32 software to measure the baseline and record the baseline measurement results.

[0074] After determining the baseline measurement results, the line loss of the measured harness can be measured. Keep the signal generator and EMI test receiver in the same position, replace the baseline with the measured harness, and continue to use the same benchmark test parameters, that is, the starting frequency is 0.15MHz, the end frequency is 30MHz, the test bandwidth is 9kHz, the test step is 5kHz, and the signal generator output is set to -30 dBm. Then click Start in the EMC32 software to measure the line loss of the measured harness. Record the measurement results of the measured line. Among them, the measured line is a coaxial line.

[0075] After obtaining the baseline measurement results and the measured line measurement results, the baseline measurement results and the measured line measurement results are compared to calculate the line loss value corresponding to each test frequency point within the test frequency range. The line loss value can be obtained by calculating the difference between the baseline measurement results and the measured line measurement results at the same frequency point.

[0076] It should be noted that when conducting the conducted interference test, the measured line loss value needs to be compensated into the test result. This means that if the value measured in the formal test is XdBm, the actual emission value should be XdBm plus the line loss value at the corresponding frequency point.

[0077] In this embodiment, by determining the baseline measurement result and the measured line measurement result, the line loss value of the measured coaxial line can be accurately measured, and corresponding compensation can be performed in the formal conducted interference test, thereby obtaining a more accurate test result.

[0078] Step S204: Analyze the measurement results of each test port to obtain a test result.

[0079] It should be noted that the above test results may include a pass or fail test. When the test is passed, it indicates that the electromagnetic compatibility of the on-board charger meets the requirements; when the test is failed, it indicates that the electromagnetic compatibility of the on-board charger does not meet the requirements and needs to be rectified and debugged.

[0080] Specifically, after obtaining the measurement results CEV-AC-L1, CEV-AC-L2, CEV-AC-L3 and CEV-AC-N of each test port, the measurement results of each test port can be analyzed to determine the limit range corresponding to the measurement results of each test port. The limit range corresponding to the measurement results of each test port can be the same or different, and can be customized according to actual needs. Determine whether the measurement results of each test port are within the limit range. When the measurement results of each test port all meet the corresponding limit range, determine that the test result is passed; when at least one of the measurement results of each test port does not meet the corresponding limit range, determine that the test result is failed.

[0081] Exemplarily, when CEV-AC-L1, CEV-AC-L2, CEV-AC-L3 and CEV-AC-N all meet the limit range, the characterization test result is test pass; when one or more of CEV-AC-L1, CEV-AC-L2, CEV-AC-L3 and CEV-AC-N do not meet the limit range, the characterization test result is test fail.

[0082] The electromagnetic compatibility test method of the on-board charger provided in an embodiment of the present application includes: when receiving a compatibility test instruction, the control signal generating device generates a control guide signal to control the charging of the sample to be tested through the control guide signal; the sample to be tested is connected to the signal generating device, and the sample to be tested is connected to the AC power supply through an AC line impedance network; the AC line impedance network includes multiple test ports; the test configuration parameters of the test receiver are obtained; the test configuration parameters include: test frequency range, test bandwidth, test step size, detector type, quasi-peak threshold, and average value threshold; when each of the multiple test ports of the AC line impedance network is respectively connected to the test receiver, the test receiver is controlled to measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters to obtain the measurement results of each test port; the measurement results of each test port are analyzed to obtain the test results. Compared with the prior art, this technical solution controls the charging of the sample to be tested through a guide signal, thereby ensuring the safety and reliability of the charging process of the sample to be tested. While ensuring safety, the sample to be tested is connected to the AC power supply through an AC line impedance network, which can isolate external interference and accurately detect the interference signal emitted by the sample to be tested during the charging process, so that the conduction test results at the vehicle level can be simulated through the test method of the on-board charger at the component level; by combining the information of the test configuration parameters, it is convenient to accurately measure the conducted emission of the phase line corresponding to the test port, so as to obtain more accurate measurement results, and then analyze the measurement results of each test port, which improves the accuracy of the test result determination, helps to evaluate the electromagnetic compatibility performance of the on-board charger in advance, facilitates the timely discovery and resolution of electromagnetic interference problems, shortens the test development cycle, improves the efficiency of electromagnetic compatibility testing, and further ensures the safety and reliability of electric vehicles.

[0083] Based on the same inventive concept, the embodiment of the present application also provides an electromagnetic compatibility test device for a vehicle charger for implementing the electromagnetic compatibility test method for the vehicle charger involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of the electromagnetic compatibility test device for one or more vehicle chargers provided below can refer to the limitations of the electromagnetic compatibility test method for the vehicle charger above, and will not be repeated here.

[0084] In an exemplary embodiment, Figure 8 As shown, an electromagnetic compatibility test device for a vehicle charger is provided, and the electromagnetic compatibility test device for the vehicle charger comprises: The signal generating module 710 is used for controlling the signal generating device to generate a control guide signal when receiving a compatible test instruction, so as to control the AC power supply to charge the sample to be tested through the control guide signal; the sample to be tested is connected to the signal generating device, and the sample to be tested is connected to the AC power supply through an AC line impedance network; the AC line impedance network includes a plurality of test ports; The acquisition module 720 is used to acquire the test configuration parameters of the test receiver; the test configuration parameters include: test frequency range, test bandwidth, test step size, detector type, quasi-peak threshold, and average value threshold; The test module 730 is used to control the test receiver to measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters when each of the multiple test ports of the AC line impedance network is connected to the test receiver respectively, so as to obtain the measurement result of each test port; The result determination module 740 is used to analyze the measurement results of each test port to obtain the test results.

[0085] As an optional implementation, the testing module 730 is specifically configured to: Record the quasi-peak value and average value corresponding to each test frequency point within the test frequency range; the test frequency range includes multiple test frequency bands, and each test frequency band has a corresponding quasi-peak value and average value; Perform line loss compensation processing on the quasi-peak value and the average value to obtain the compensated quasi-peak value and the compensated average value; Determine whether the compensated quasi-peak value is greater than the quasi-peak value threshold corresponding to the test frequency band where the quasi-peak value is located, and determine whether the compensated average value is greater than the average value threshold corresponding to the test frequency band where the average value is located; When the compensated quasi-peak value is not greater than the quasi-peak value threshold or the compensated average value is not greater than the average value threshold, a measurement result of the test port is obtained.

[0086] As an optional implementation, the testing module 730 is further configured to: Obtain the line loss value of each test frequency point within the test frequency range; According to the line loss value of each test frequency band, the quasi-peak value and the average value corresponding to each test frequency point, the compensated quasi-peak value and the compensated average value are calculated.

[0087] As an optional implementation, the testing module 730 is further configured to: Obtaining benchmark test parameters; the benchmark test parameters include test configuration parameters and signal output parameters, and the signal output parameters include: signal output values; When the signal generator is connected to the test receiver via a reference line, the reference line is tested according to the reference test parameters to obtain a reference line measurement result; When the signal generator is connected to the test receiver through the tested line, the tested line is tested according to the reference test parameters to obtain the measurement result of the tested line; Based on the baseline measurement results and the measured line measurement results, determine the line loss value within the test frequency range.

[0088] As an optional implementation, the above device is also used for: When the compensated quasi-peak value is greater than the quasi-peak value threshold corresponding to the test frequency band where the quasi-peak value is located, the rectification test is performed again until the measurement result output conditions are met to obtain the measurement result of the test port; or, When the compensated average value is greater than the average value threshold corresponding to the test frequency band where the average value is located, the rectification test is re-executed until the measurement result output condition is met to obtain the measurement result of the test port.

[0089] As an optional implementation, the result determination module 740 is specifically configured to: When the measurement results of each test port meet the corresponding limit range, the test result is determined to be passed; When at least one of the measurement results of each test port does not satisfy the corresponding limit range, the test result is determined to be a test failure.

[0090] Among them, by implementing this implementation method, the technical scheme controls the charging of the sample to be tested through the guide signal, ensuring the safety and reliability of the charging process of the sample to be tested, and while ensuring safety, the sample to be tested is connected to the AC power supply through the AC line impedance network, which can isolate external interference and accurately detect the interference signal emitted by the sample to be tested during the charging process, so that the test method of the on-board charger at the component level can be used to simulate the conduction test results at the vehicle level; by combining the information of the test configuration parameters, it is convenient to accurately measure the conducted emission of the phase line corresponding to the test port, so as to obtain more accurate measurement results, and then analyze the measurement results of each test port, which improves the accuracy of the test result determination, helps to evaluate the electromagnetic compatibility performance of the on-board charger in advance, and facilitates the timely discovery and resolution of electromagnetic interference problems, shortens the test development cycle, improves the efficiency of electromagnetic compatibility testing, and further ensures the safety and reliability of electric vehicles.

[0091] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Fig. 9As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store video tag processing data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, an electromagnetic compatibility test method for a vehicle charger is implemented.

[0092] Those skilled in the art will understand that Fig. 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0093] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0094] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0095] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0096] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0097] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0098] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0099] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for testing electromagnetic compatibility of a vehicle charger, characterized in that: The electromagnetic compatibility test method of the on-board charger includes: When receiving a compatible test instruction, the control signal generating device generates a control guide signal to control the AC power supply to charge the sample to be tested through the control guide signal; the sample to be tested is connected to the signal generating device, and the sample to be tested is connected to the AC power supply through an AC line impedance network; the AC line impedance network includes a plurality of test ports; Acquire test configuration parameters of the test receiver; the test configuration parameters include: test frequency range, test bandwidth, test step length, detector type, quasi-peak threshold, and average value threshold; When each of the multiple test ports of the AC line impedance network is connected to a test receiver, the test receiver is controlled to measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters to obtain the measurement results of each test port; The measurement results of each test port are analyzed to obtain a test result.

2. The electromagnetic compatibility test method of the vehicle charger according to claim 1, characterized in that: Measuring the conducted emission of the phase line corresponding to the test port according to the test configuration parameters to obtain the measurement results of each test port, including: Record the quasi-peak value and average value corresponding to each test frequency point within the test frequency range; the test frequency range includes multiple test frequency bands, and each test frequency band corresponds to a quasi-peak value and an average value; Performing line loss compensation processing on the quasi-peak value and the average value to obtain a compensated quasi-peak value and a compensated average value; Determine whether the compensated quasi-peak value is greater than a quasi-peak value threshold corresponding to the test frequency band where the quasi-peak value is located, and determine whether the compensated average value is greater than an average value threshold corresponding to the test frequency band where the average value is located; When the compensated quasi-peak value is not greater than the quasi-peak value threshold or the compensated average value is not greater than the average value threshold, the measurement result of the test port is obtained.

3. The electromagnetic compatibility test method of the vehicle charger according to claim 2, characterized in that: Performing line loss compensation processing on the quasi-peak value and the average value to obtain a compensated quasi-peak value and a compensated average value, including: Obtaining line loss values ​​at each test frequency point within the test frequency range; The compensated quasi-peak value and the compensated average value are calculated according to the line loss values ​​of the respective test frequency bands, the quasi-peak value and the average value corresponding to the respective test frequency points.

4. The electromagnetic compatibility test method of the vehicle charger according to claim 3 is characterized in that: Obtaining the line loss value of each test frequency point within the test frequency range, including: Obtaining benchmark test parameters; the benchmark test parameters include test configuration parameters and signal output parameters, and the signal output parameters include: signal output values; When the signal generator is connected to the test receiver via a reference line, the reference line is tested according to the reference test parameters to obtain a reference line measurement result; When the signal generator is connected to the test receiver through the line under test, the line under test is tested according to the reference test parameters to obtain a measurement result of the line under test; Based on the baseline measurement result and the measured line measurement result, a line loss value within the test frequency range is determined.

5. The electromagnetic compatibility test method of the vehicle charger according to claim 2, characterized in that: After determining whether the compensated quasi-peak value is greater than a quasi-peak value threshold corresponding to the test frequency band where the quasi-peak value is located, and determining whether the compensated average value is greater than an average value threshold corresponding to the test frequency band where the average value is located, the method further includes: When the compensated quasi-peak value is greater than the quasi-peak value threshold corresponding to the test frequency band where the quasi-peak value is located, re-perform the rectification test until the measurement result output condition is met to obtain the measurement result of the test port; or, When the compensated average value is greater than the average value threshold corresponding to the test frequency band where the average value is located, the rectification test is re-executed until the measurement result output condition is met to obtain the measurement result of the test port.

6. The electromagnetic compatibility test method of the vehicle charger according to claim 1, characterized in that: The measurement results of each test port are analyzed to obtain test results, including: When the measurement results of each test port meet the corresponding limit range, determine that the test result is a test pass; When at least one of the measurement results of the test ports does not satisfy the corresponding restriction range, the test result is determined to be a test failure.

7. An electromagnetic compatibility test system for a vehicle charger, characterized in that: include: A main control device, a signal generating device, an AC line impedance network, and a test receiver; the main control device establishes communication connections with the signal generating device and the test receiver respectively; The sample to be tested is connected to an AC power source through the AC line impedance network, the sample to be tested is connected to the signal generator, the AC line impedance network includes a plurality of test ports, and the AC line impedance network is connected to the test receiver through the test ports; The main control device is used to: obtain the test configuration parameters of the test receiver, and generate a control instruction according to the test configuration parameters and send it to the test receiver; The test configuration parameters include: test frequency range, test bandwidth, test step length, detector type, quasi-peak threshold, average value threshold; the AC line impedance network includes multiple test ports; The signal generating device is used to: generate a control guide signal to enable the sample to be tested to perform a charging operation; The test receiver is used to: receive and respond to the control instruction, measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters, obtain the measurement results of each test port and send them to the main control device; The main control device is also used to analyze the measurement results of each test port to obtain the test results.

8. The electromagnetic compatibility test system of the vehicle charger according to claim 7, characterized in that: The signal generating device comprises: a test cavity, a signal generator, and a grounded copper table; the signal generator and the grounded copper table are located inside the test cavity; the sample to be tested and the charging gun are placed on the grounded copper table, the grounding end of the AC line impedance network is grounded to the metal structure of the test cavity ground, and the signal generator is grounded to the metal structure of the test cavity ground; The signal generator is used to generate a control guide signal to control the charging operation of the sample to be tested.

9. A main control device, comprising: 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 electromagnetic compatibility test method for the on-board charger according to any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the electromagnetic compatibility testing method of the on-board charger according to any one of claims 1 to 6 is implemented.

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