Electromagnetic compatibility test method, system, device and medium for on-board charger

Abstract

The present application discloses an electromagnetic compatibility testing method, system, device, and medium for an on-board charger. The method includes: upon receiving a compatibility test instruction, a control signal generating device generates a control pilot signal to control an AC power source to charge a sample under test through the control pilot signal; an AC line impedance network includes multiple test ports; test configuration parameters of a test receiver are obtained; 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 measurement results for each test port; and the measurement results for each test port are analyzed to obtain test results. This technical solution can simulate the conducted interference test results at the vehicle level through the component-level on-board charger test method, shortening the test development cycle and improving the efficiency of electromagnetic compatibility testing.

Description

Technical Field

[0001] The present invention generally relates to the field of electromagnetic compatibility testing technology, 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 automotive technology, electric vehicles have become increasingly used in people's daily lives. As a core component of electric vehicles, on-board chargers (OBCs) are installed inside them. They are power conversion devices that convert external AC power into the DC power required by the electric vehicle. However, during the charging and discharging process, EVs' electrical and electronic equipment, such as their battery management systems and motor control systems, generate complex electromagnetic interference. This interference not only affects the proper functioning of the vehicle's own electrical and electronic equipment but can also adversely affect the surrounding environment and equipment. To improve EV charging efficiency and ensure safety and stability during the charging and discharging process, it is particularly important to evaluate the electromagnetic compatibility of OBC performance.

[0003] Currently, related technologies test the electromagnetic compatibility of EVs using conductive charging according to pre-set test standards. This approach measures the electromagnetic radiation levels of EVs under specific operating conditions to assess their electromagnetic compatibility. However, this approach is time-consuming, shortens the R&D cycle, and results in low EMC testing efficiency. 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 testing method, system, device and medium for an on-board charger.

[0005] In a first aspect, the present invention provides a method for evaluating ground plane radiation field strength, the method comprising:

[0006] When receiving a compatible test instruction, the control signal generating device generates a control pilot signal to control the AC power supply to charge the sample to be tested through the control pilot 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;

[0007] Acquire 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 threshold;

[0008] When each of the multiple test ports of the AC line impedance network is connected to a test receiver, controlling the test receiver to measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters to obtain a measurement result of each test port;

[0009] The measurement results of the various test ports are analyzed to obtain test results.

[0010] In one embodiment, measuring the conducted emissions of the phase lines corresponding to the test ports according to the test configuration parameters to obtain the measurement results of the respective test ports includes:

[0011] Recording 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 average value;

[0012] 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;

[0013] Determining whether the compensated quasi-peak value is greater than a quasi-peak value threshold corresponding to the test frequency band in which 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 in which the average value is located;

[0014] 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.

[0015] In one embodiment, performing line loss compensation on the quasi-peak value and the average value to obtain the compensated quasi-peak value and the compensated average value includes:

[0016] Obtaining the line loss value of each test frequency point within the test frequency range;

[0017] 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.

[0018] In one embodiment, obtaining the line loss value of each test frequency point within the test frequency range includes:

[0019] Obtaining benchmark test parameters; the benchmark test parameters include test configuration parameters and signal output parameters, the signal output parameters include: signal output values;

[0020] 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;

[0021] 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;

[0022] Based on the baseline measurement result and the measured line measurement result, a line loss value within the test frequency range is determined.

[0023] In one embodiment, after determining whether the compensated quasi-peak value is greater than a quasi-peak value threshold corresponding to the test frequency band in which 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 in which the average value is located, the method further includes:

[0024] 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-performing the rectification test until the measurement result output condition is met to obtain the measurement result of the test port; or

[0025] 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.

[0026] In one embodiment, analyzing the measurement results of each test port to obtain the test results includes:

[0027] When the measurement results of each test port meet the corresponding limit range, the test result is determined to be a test pass;

[0028] When at least one of the measurement results of the test ports does not meet the corresponding limit range, the test result is determined to be a test failure.

[0029] 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 communication connections with the signal generating device and the test receiver respectively; a sample to be tested is connected to an AC power supply through the AC line impedance network, the sample to be tested is connected to the signal generator, the AC line impedance network includes multiple test ports, and the AC line impedance network is connected to the test receiver through the test ports;

[0030] The main control device is used to: obtain test configuration parameters of the test receiver, and generate control instructions based on 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, and average value threshold; the AC line impedance network includes multiple test ports;

[0031] The signal generating device is used to: generate a control guide signal to enable the sample to be tested to perform a charging operation;

[0032] 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;

[0033] The main control device is further used to analyze the measurement results of each test port to obtain a test result.

[0034] In a third aspect, an embodiment of the present application provides 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 method provided in the above embodiment.

[0035] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method provided in the above embodiment.

[0036] The electromagnetic compatibility testing method, system, device, and medium for an on-board charger provided in an embodiment of the present application include: when receiving a compatibility test instruction, controlling a signal generating device to generate a control guide signal to control the charging of a sample to be tested through the control guide signal; connecting the sample to be tested to the signal generating device, and connecting the sample to be tested to an AC power source through an AC line impedance network; the AC line impedance network includes multiple test ports; obtaining test configuration parameters of a test receiver; 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, controlling the test receiver to measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters to obtain measurement results for each test port; and analyzing the measurement results of each test port to obtain a test result. Compared with the existing technology, this technical solution controls the charging of the sample to be tested through a guide signal, 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 component-level on-board charger test method; 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, thereby obtaining more accurate measurement results, and then analyzing the measurement results of each test port, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0038] Figure 1 A schematic diagram of the front view of the conducted interference test system for the entire vehicle provided in an embodiment of the present application;

[0039] Figure 2 A schematic top view of the conducted interference test system for a vehicle provided in an embodiment of the present application;

[0040] Figure 3 A schematic diagram of the structure of an electromagnetic compatibility test system for an on-board charger provided in one embodiment of the present application;

[0041] Figure 4 A schematic diagram of the structure of an electromagnetic compatibility test system for an on-board charger provided in another embodiment of the present application;

[0042] Figure 5 A flow chart of an electromagnetic compatibility testing method for an on-board charger provided in an embodiment of the present application;

[0043] Figure 6 A flow chart of a method for measuring the conducted emissions of the phase line corresponding to the test port and obtaining the measurement results of each test port provided in an embodiment of the present application;

[0044] Figure 7 A schematic flow chart of a method for determining line loss values ​​within a test frequency range provided in an embodiment of the present application;

[0045] Figure 8 A schematic diagram of the structure of the electromagnetic compatibility test device for the on-board charger provided in an embodiment of the present application;

[0046] Figure 9 A schematic diagram of the internal structure of the main control device provided in an embodiment of the present application;

[0047] Description of Reference Numerals

[0048] 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; grounded copper table-13; test sample-14; charging gun-15; main control unit-20; AV LISN-30; test receiver-40; AC power supply-50; HV power supply-60; HV LISN-61; low-voltage power supply-70; low-voltage LISN-71; DC-DC load-72; resistive load-73. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0050] In order to make the above-mentioned purposes, 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.

[0051] See 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 2 This is a top-down schematic diagram of the conducted interference test system for a whole vehicle provided in an embodiment of the present application. The system includes an electric vehicle 1, an insulating support 2, a charging cable 3, a power supply network 4, a simulated AC charging station 5, and a measurement receiver 6. The electric vehicle 1 is connected to one end of the power supply network 4 via the charging cable 3 via a charging gun. The other end of the power supply network 4 is connected to the simulated AC charging station 5. The output port of the power supply network 4 is also connected to the measurement receiver via a coaxial cable.

[0052] The power supply network 4 can be an AC LISN. The thickness of the insulating support 2 can 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 prevent unnecessary grounding paths from affecting the test results.

[0053] During the test process, 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 for narrowband radiated electromagnetic energy. According to the test frequency range, scanning speed, resolution bandwidth and other parameters, the RF conducted emissions on different phase lines and neutral line (N) are tested to obtain test results.

[0054] 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 on other electronic equipment in the vehicle and improve the user experience.

[0055] The electromagnetic compatibility test system of a vehicle charger provided in the embodiment of the present application can be found in Figure 3The electromagnetic compatibility test system for the on-board charger includes a main control device 20, a signal generating device 10, an AC line impedance network (AV LISN 30), and a test receiver 40. The main control device 20 establishes communication connections with the signal generating device 10 and the test receiver 40. The test sample 14 is connected to the AC power source 50 via the AV LISN 30, and the test sample 14 is connected to the signal generator 12. The AV LISN 30 includes multiple test ports, and the AV LISN 30 is connected to the test receiver 40 via the test ports.

[0056] The main control device 20 is used to obtain the test configuration parameters of the test receiver 40, generate control instructions based on the test configuration parameters, and send them to the test receiver. The test configuration parameters include the test frequency range, test bandwidth, test step size, detector type, quasi-peak threshold, and average threshold. The AC line impedance network includes multiple test ports. The signal generator 10 is used to generate control pilot signals to charge the sample under test. The test receiver 40 is used to receive and respond to the control instructions, measure the conducted emissions of the phase line corresponding to the test port according to the test configuration parameters, obtain measurement results for 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 test results.

[0057] The test sample 14 can be an on-board charger, which can be connected to an AC power source 50 via a charging gun 15. During electromagnetic compatibility testing of the on-board charger, the signal generator 10 is used to generate a control pilot signal (CP signal) to control the charging operation of the test sample 14. The charging gun 15 is used to charge an electric vehicle. The CP signal can be a ±12V square wave with a 50% duty cycle.

[0058] 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 communication with the server. The main control device 20 may be configured with EMC 32 test software, which controls the entire testing process, including processing collected data and analyzing results. The software is also responsible for recording test conditions and results and generating reports that comply with regulations.

[0059] Optionally, the server may be a single server, a server cluster or a distributed system consisting 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 (CDNs), and big data and artificial intelligence platforms. The terminal may run an operating system, which may include but is not limited to Android, iOS, Linux, Unix, and Windows. The terminal may also include a user interface (UI) layer that can display data externally. Furthermore, the terminal may be configured to send a first control instruction 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. The terminal may also be configured 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.

[0060] 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.

[0061] An AC line impedance network, also known as an AC LISN (Line Impedance Stabilization Network), is a network used to stabilize the AC line impedance and provide a measurement point to detect interference signals from the device under test. In power systems, an AC LISN is primarily used to measure the input impedance of a device to ensure the accuracy of the measurement results. The AC LISN includes test ports, each corresponding to a phase line. For example, these 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. During compatibility testing of an on-board charger, each test port of the AC line impedance network can be sequentially connected to a test receiver to obtain interference information.

[0062] 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 results of each test port and send them to the main control device 20.

[0063] The main control device 20 is used to analyze the measurement results of each test port after receiving them to obtain the test results.

[0064] AC power, also known as AC power, is a form of electricity whose current direction changes periodically. For electric vehicles, AC power is typically used for charging services provided by charging stations. Household outlets also typically provide AC power, which can be used to charge electric vehicles using appropriate chargers. AC charging is generally divided into single-phase (such as household 220V / 110V) and three-phase (such as industrial 380V / 400V).

[0065] In this embodiment, by connecting the device under test to an AC LISN via a charging cable, which in turn connects the AC LISN to an AC power source, all potential RF noise from the vehicle must pass through the AC LISN, allowing accurate capture and measurement of interference signals. Furthermore, the AC LISN provides a stable power supply impedance for the device under test (EUT) during testing, isolating interference from the power supply and coupling interference signals generated by the device under test to the test receiver for accurate measurement.

[0066] In one embodiment, see Figure 4 As shown, the signal generating device 10 includes: 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 ground terminal of the AV LISN 30 is grounded to the metal structure of the test chamber 11. The signal generator 12 is also grounded to the metal structure of the test chamber 11.

[0067] The signal generator 12 is used to generate a control pilot CP signal to control the charging operation of the sample 14 to be tested.

[0068] 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. During the charging gun test, a CP signal needs to be provided to ensure normal charging. Therefore, a signal generator needs to be set. 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%.

[0069] The AC LISN 30, the sample to be tested 14, and the signal generator 12 are all located in a test chamber. The test chamber 11 can be a darkroom, which can be understood as a shielded chamber with a large size and highly conductive reflective walls. The shielded chamber is affixed with ferrite and absorbing foam to absorb electromagnetic waves and reduce their reflection.

[0070] 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. Its size should be large enough. For example, it can be a wooden table. A copper plate is laid on the wooden table. The copper plate is directly plugged into 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 on 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.

[0071] 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 DC-DC 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 via the HV LISN 61 , and is further connected to the low-voltage power supply 70 and the DC-DC load 72 via the LV LISN 71 .

[0072] It should be noted that the HV LISN61 (High-Voltage Line Impedance Stabilization Network) is primarily used for electromagnetic compatibility (EMC) testing of high-voltage systems. In systems containing high-voltage components, such as high-voltage battery systems and high-voltage motor drive systems, such as electric vehicles, it simulates the impedance characteristics of the actual power grid, provides a standard power interface for the high-voltage components, and extracts and measures the high-frequency interference signals generated by these components. The HV LISN61 typically operates at a high voltage range, typically reaching several hundred volts or even higher, to meet the requirements of high-voltage systems. For example, in testing high-voltage battery systems in electric vehicles, the operating voltage may reach around 300-400V. Its impedance characteristics are generally designed in accordance with relevant EMC standards, such as providing a stable 50Ω or 100Ω source impedance within a specific frequency range (e.g., 150kHz-30MHz).

[0073] The LV LISN71 (Low-Voltage Line Impedance Stabilization Network) is primarily used for electromagnetic compatibility (EMC) testing of low-voltage systems. Automotive electronic systems contain many low-voltage components, such as body control modules and in-vehicle entertainment systems. These components typically operate at low voltages (typically around 12V-24V). The LV LISN71 provides a stable power supply impedance for these low-voltage components and couples the interference signals they generate, facilitating EMC testing of these components. Typical parameters and operating ranges for the LV LISN are: The operating voltage range is generally low, suitable for 12V or 24V automotive low-voltage electrical systems. Within a certain frequency range (e.g., 150kHz-30MHz), it also provides a standard power supply impedance, such as approximately 50Ω, to ensure test accuracy and consistency. It effectively isolates interference from the power supply side, enabling testers to accurately measure the electromagnetic interference signals generated by low-voltage components themselves.

[0074] 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 and inverters). These voltages are much higher than the traditional 12V automotive electrical system. They are mainly used to drive high-power components such as electric vehicles and air conditioning compressors.

[0075] AC power 50 source typically refers to the external AC power source used to charge electric vehicles, while HV power 60 involves the high-voltage system within the vehicle. Low-voltage power (LV) typically refers to the traditional 12V or 24V electrical system. LV power systems are primarily used to support various auxiliary functions and electronic equipment in the vehicle. LV power systems are responsible for powering the vehicle's auxiliary and non-power systems, such as lighting, audio, air conditioning control systems, instrument panels, airbags, ABS (anti-lock braking system), electronic control units (ECUs), and infotainment systems.

[0076] DCDC load 72 typically refers to the electronic devices and systems 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, and control units. These loads can be nonlinear and have complex electrical characteristics. Resistive load 73, on the other hand, is an ideal, linear load model commonly used in testing and simulation. Resistive loads can include one or more resistors.

[0077] 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.

[0078] Taking the AC LISN, which has four test ports, as an example, after connecting each test port to the test receiver in sequence and performing the test according to the test configuration parameters, the RF conducted emission characteristic data for different phase lines (L1, L2, L3) and the neutral line (N) will be obtained, marked as CEV-AC-L1, CEV-AC-L2, CEV-AC-L3 and CEV-AC-N.

[0079] The electromagnetic compatibility (EMC) testing system for an on-board charger provided in this embodiment includes a signal generator, a main control device, an AC line impedance network, and a test receiver. This technical solution controls the charging of a test sample using a guide signal, ensuring the safety and reliability of the test sample during charging. While ensuring safety, the test sample is connected to an AC power source via the AC line impedance network, isolating external interference and accurately detecting interference signals emitted by the test sample during charging. This allows the component-level on-board charger testing method to simulate vehicle-level conduction test results. By incorporating information from test configuration parameters, the conducted emission of the phase line corresponding to the test port can be accurately measured, resulting in more accurate measurement results. The measurement results of each test port can then be analyzed, improving the accuracy of the test results. This helps to preemptively assess the electromagnetic compatibility (EMC) performance of the on-board charger, facilitates the timely detection and resolution of electromagnetic interference issues, shortens the test development cycle, improves the efficiency of EMC testing, and further ensures the safety and reliability of electric vehicles.

[0080] 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 FIG. 1 is taken as an example to illustrate the method, which includes the following steps S201 to S204. In which:

[0081] 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.

[0082] It should be noted that when an on-board charger needs to be tested for electromagnetic compatibility, the sample to be tested is connected to the signal generating device via the charging gun, the sample to be tested is connected to the AC power supply via the AC LSIN, and a coaxial cable is used to connect the receiving port of the test receiver to the test port of the AC LSIN. The test receiver is equipped with EMC 32 software. The user can perform input operations to send a compatibility test instruction to the main control device. The main control device receives the compatibility test instruction, then controls the signal generator in the signal generating device to generate a CP signal, and uses the CP signal to control the AC power supply to charge the sample to be tested.

[0083] In electric vehicle charging systems, the CP signal is a control signal. It's primarily used to control the charging process and serves as a communication signal between the electric vehicle and the charging station. For example, the CP signal allows for information exchange between the vehicle and the charging station, including charging power adjustment, charging status feedback, and other important charging-related information. The CP signal consists of a ±12V square wave with a 50% duty cycle. A square wave signal is a non-sinusoidal signal whose voltage rapidly switches between two fixed levels. A 50% duty cycle means that within one cycle, the high and low levels are equal. This specific voltage amplitude and duty cycle of the CP signal provide the charging gun with the necessary control information to ensure that charging proceeds normally according to specified requirements.

[0084] Step S202 , obtaining 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.

[0085] It should be noted that the test frequency range, test bandwidth, test step size, detector type, quasi-peak threshold, and average value threshold described above can be customized based on actual needs. The test frequency range refers to the frequency range to be tested, for example, 0.15MHz-30MHz. The test bandwidth refers to the bandwidth used by the test system when performing measurements within a certain test frequency band, for example, 9kHz. The test step size refers to the amplitude of each frequency change during a frequency sweep, for example, 5kHz. Detector types can include peak detectors and average detectors.

[0086] 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. The multiple test frequency bands can include, for example, 0.15~0.5MHz, 0.5~5MHz, and 5~30MHz. Each test frequency band can correspond to a quasi-peak threshold, an average value threshold, and a detector type. One 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:

[0087] Table 1

[0088]

[0089] The above thresholds include quasi-peak thresholds and average thresholds.

[0090] Step S203 , 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 a measurement result of each test port.

[0091] Specifically, after obtaining the test configuration parameters, the test receiver can be controlled to configure the test parameters, the test frequency range can be set to 0.15MHz-30MHz, the test bandwidth can be set to 9kHz, the test step size can be set to 5kHz, the detector type can be set to peak detector and average detector, and the threshold can be set to the corresponding peak limit and average threshold as shown in Table 1.

[0092] For example, the onboard charger (OBC) is connected to the CP signal generator via the wiring harness and charging connector. The charging connector is also connected to the AC power supply via the AC line impedance network. The OBC is connected to the low-voltage power supply via the LV LISN and to the HV power supply via the HV LISN. The OBC is also connected to a DC-DC load and a resistive load via the LV LISN. To best simulate the full vehicle test conditions, the OBC, DC-DC load, LV LISN, and HV LISN are all grounded to the test copper table. The AC LISN's ground terminal is also grounded to the metal structure of the chamber floor, and the CP signal generator is also grounded to the metal structure of the chamber floor.

[0093] 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:

[0094] Step S301 , recording 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 average value.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] After connecting all components of the on-board charger's electromagnetic compatibility test system, the AC LISN's four test ports—L1, L2, L3, and N—are tested. First, connect the AC LISN's L1 test port to a signal receiver via a coaxial cable and set the LISNSELECTION key to the corresponding port. Use EMC 32 software to set the test receiver's test configuration parameters. Then, measure the conducted emissions of the L1 phase line corresponding to the L1 test port, recording the quasi-peak and average values ​​for each test frequency within the test frequency range.

[0099] It is understandable that the coaxial cables 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. This can more accurately reflect the electromagnetic emission characteristics of the sample to be tested under actual usage conditions, thereby ensuring the authenticity and reliability of the test results.

[0100] 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.

[0101] 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.

[0102] If the compensated quasi-peak value is greater than the quasi-peak threshold corresponding to the test frequency band of the test port's quasi-peak value, the test is determined to be a fail and the rectification test is re-executed until the measurement result output conditions are met, thereby obtaining the test port's measurement result. Alternatively, if the compensated average value is greater than the average value threshold corresponding to the test frequency band of the test port's average value, the rectification test is re-executed until the measurement result output conditions are met, thereby obtaining the measurement result CEV-AC-L1 of the L1 test port. The measurement result output condition can be that the compensated quasi-peak value is greater than the quasi-peak threshold corresponding to the test frequency band of the test port's quasi-peak value, or that the compensated average value is greater than the average value threshold corresponding to the test frequency band of the test port's quasi-peak value.

[0103] After determining the measurement results for the L1 test port, connect the AC LISN's L2 test port to a signal receiver via coaxial cable and turn the LISN SELECTION button to the corresponding port. Use EMC 32 software to set the test receiver's test configuration parameters and begin measuring the conducted emissions of the L2 phase line corresponding to the L2 test port. Record the quasi-peak and average values ​​for each test frequency within the test frequency range. Similarly, similar to the method for the L1 test port, obtain the measurement results for the L2 test port, CEV-AC-L2. After determining the measurement results for the L2 test port, connect the AC LISN's L3 and test port N to the signal receiver via coaxial cable, and turn the LISN SELECTION button to the corresponding port. This will measure the conducted emissions of the L2 phase line corresponding to the L3 test port, obtaining the measurement results for the L3 test port, CEV-AC-L3. Furthermore, measure the conducted emissions of the neutral line, N, corresponding to the N test port, obtaining the measurement results for the N test port, CEV-AC-N.

[0104] It's 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 lines. Each parameter corresponds to a different part of a three-phase AC power system: CEV-AC-L1: Represents the RF conducted emission value on phase 1 (L1). This refers to the electromagnetic interference level measured on phase L1. CEV-AC-L2: Represents the RF conducted emission value on phase 2 (L2). This refers to the electromagnetic interference level measured on phase L2. CEV-AC-L3: Represents the RF conducted emission value on phase 3 (L3). This refers to the electromagnetic interference level measured on phase L3. CEV-AC-N: Represents the RF conducted emission value on the neutral conductor (N), which refers to the electromagnetic interference level measured on the neutral conductor.

[0105] These parameters are used to assess whether electric vehicles and their charging systems comply with relevant electromagnetic compatibility standards, specifically whether the radio frequency interference generated during charging is kept within acceptable limits. The test results help manufacturers ensure that their products do not interfere with other nearby electronic devices, while also ensuring that the electric vehicles themselves are not adversely affected by external electromagnetic fields. Testing is typically performed within a specific frequency range to cover all frequencies that may cause problems. These terms are generally used to describe the level of electromagnetic interference conducted through power lines.

[0106] In one embodiment, 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:

[0107] 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.

[0108] Step S402 : When the signal generator is connected to the test receiver via a reference line, a test is performed on the reference line according to the reference test parameters to obtain a reference line measurement result.

[0109] Step S403 : When the signal generator is connected to the test receiver via the tested line, the tested line is tested according to the reference test parameters to obtain a measurement result of the tested line.

[0110] 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.

[0111] Understandably, measuring cable loss is an important step in electromagnetic compatibility (EMC) testing, especially when using long coaxial cables or other types of cables. Cable loss can affect the accuracy of test results, so it needs to be measured and compensated for in the formal test.

[0112] To determine the line loss value within the test frequency range, you can first perform a baseline measurement. Connect the signal generator and test receiver directly via a baseline line. The baseline line is usually a short, high-quality coaxial line. Then, configure a calibration file in the EMC32 software of the signal tester. By opening the EMC32 software, loading the corresponding calibration file, and setting the benchmark test parameters, the benchmark test parameters include: a start frequency of 0.15MHz, an end frequency of 30MHz, a test bandwidth of 9kHz, a test step size of 5kHz, and a signal generator output of -30dBm. Then, click Start in the EMC32 software to perform the baseline measurement and record the baseline measurement results.

[0113] After determining the baseline measurement results, you can measure the cable loss of the harness under test. Keeping the signal generator and EMI test receiver in the same position, replace the baseline with the harness under test. Continue using the same benchmark test parameters: a 0.15MHz start frequency, a 30MHz stop frequency, a 9kHz test bandwidth, a 5kHz test step, and set the signal generator output to -30 dBm. Then, click Start in the EMC32 software to measure the cable loss of the harness under test. Record the measurement results for the coaxial cable under test.

[0114] After obtaining the baseline and measured line measurement results, compare the baseline and measured line measurement results 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 and measured line measurement results at the same frequency point.

[0115] It should be noted that when conducting a formal conducted interference test, the measured line loss value needs to be compensated into the test results. 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.

[0116] In this embodiment, by determining the baseline measurement results and the measured line measurement results, 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 to obtain more accurate test results.

[0117] Step S204: Analyze the measurement results of each test port to obtain a test result.

[0118] It should be noted that the above test results can include pass and fail. If the test passes, it indicates that the electromagnetic compatibility of the on-board charger meets the requirements; if the test fails, it indicates that the electromagnetic compatibility of the on-board charger does not meet the requirements and needs to be corrected and debugged.

[0119] Specifically, after obtaining the measurement results CEV-AC-L1, CEV-AC-L2, CEV-AC-L3, and CEV-AC-N for each test port, the measurement results for each test port can be analyzed to determine the corresponding limit ranges for each test port's measurement results. The limit ranges corresponding to the measurement results of each test port can be the same or different and can be customized according to actual needs. A determination is then made as to whether the measurement results of each test port fall within the limit ranges. If all the measurement results of each test port fall within the corresponding limit ranges, the test result is determined to be a pass. If at least one of the measurement results of each test port does not fall within the corresponding limit range, the test result is determined to be a fail.

[0120] For example, 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 passed; 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 failed.

[0121] An embodiment of the present application provides an electromagnetic compatibility testing method for an on-board charger, the method comprising: upon receiving a compatibility test instruction, controlling a signal generating device to generate a control pilot signal to control charging of a sample to be tested via the control pilot signal; connecting the sample to be tested to the signal generating device, and connecting the sample to be tested to an AC power source via an AC line impedance network; the AC line impedance network comprising multiple test ports; obtaining test configuration parameters of a test receiver; the test configuration parameters comprising: a test frequency range, a test bandwidth, a test step size, a detector type, a quasi-peak threshold, and an average value threshold; when each of the multiple test ports of the AC line impedance network is respectively connected to a test receiver, controlling the test receiver to measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters to obtain measurement results for each test port; and analyzing the measurement results for each test port to obtain a test result. Compared with the existing technology, this technical solution controls the charging of the sample to be tested through a guide signal, 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 component-level on-board charger test method; 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, thereby obtaining more accurate measurement results, and then analyzing the measurement results of each test port, 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.

[0122] Based on the same inventive concept, embodiments of the present application also provide an on-board charger electromagnetic compatibility testing device for implementing the aforementioned on-board charger electromagnetic compatibility testing method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more on-board charger electromagnetic compatibility testing device embodiments provided below can be found in the aforementioned limitations of the on-board charger electromagnetic compatibility testing method and will not be further elaborated here.

[0123] 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 includes:

[0124] The signal generating module 710 is configured to, upon receiving a compatible test instruction, control the signal generating device to generate a control pilot signal, thereby controlling the AC power supply to charge the sample under test via the control pilot signal; the sample under test is connected to the signal generating device, and the sample under test is connected to the AC power supply via an AC line impedance network; the AC line impedance network includes a plurality of test ports;

[0125] The acquisition module 720 is used to obtain 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 threshold;

[0126] The test module 730 is configured to control the test receiver to measure the conducted emission of the phase line corresponding to each test port according to the test configuration parameters when each test port of the AC line impedance network is connected to the test receiver, thereby obtaining a measurement result for each test port;

[0127] The result determination module 740 is used to analyze the measurement results of each test port to obtain a test result.

[0128] As an optional implementation, the testing module 730 is specifically configured to:

[0129] 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;

[0130] Perform line loss compensation on the quasi-peak value and the average value to obtain the compensated quasi-peak value and the compensated average value;

[0131] 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;

[0132] 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.

[0133] As an optional implementation, the testing module 730 is further configured to:

[0134] Obtain the line loss value of each test frequency point within the test frequency range;

[0135] 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.

[0136] As an optional implementation, the testing module 730 is further configured to:

[0137] Obtaining benchmark test parameters; benchmark test parameters include test configuration parameters and signal output parameters, signal output parameters include: signal output value;

[0138] When the signal generator and the test receiver are connected via a reference line, the reference line is tested according to the reference test parameters to obtain a reference line measurement result;

[0139] When the signal generator is connected to the test receiver through the tested line, the tested line is tested according to the benchmark test parameters to obtain the measured result of the tested line;

[0140] Based on the baseline line measurement results and the measured line measurement results, determine the line loss value within the test frequency range.

[0141] As an optional embodiment, the above device is further used to:

[0142] When 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, re-execute the rectification test until the measurement result output conditions are met and the measurement result of the test port is obtained; or,

[0143] 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, and the measurement result of the test port is obtained.

[0144] As an optional implementation, the result determination module 740 is specifically configured to:

[0145] When the measurement results of each test port meet the corresponding limit range, the test result is determined to be passed;

[0146] When at least one of the measurement results of each test port does not meet the corresponding limit range, the test result is determined to be test failure.

[0147] Among them, by implementing this implementation method, the technical solution 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 conduction test results at the vehicle level can be simulated through the component-level on-board charger test method; 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, thereby obtaining more accurate measurement results, and then analyzing the measurement results of each test port, 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.

[0148] 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: Figure 9 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. 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 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, it implements an electromagnetic compatibility test method for a vehicle charger.

[0149] Those skilled in the art will understand that Figure 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 shown in the figure, or combine certain components, or have a different component arrangement.

[0150] In an exemplary embodiment, a computer device is further provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0151] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0152] In an exemplary embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0153] 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.

[0154] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. 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 above-mentioned embodiments. In particular, any reference to memory, database, or other media 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), magnetic 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).

[0155] The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may include, but are not limited to, general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic units, data processing logic units based on quantum computing, and the like.

[0156] The technical features of the above embodiments can 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.

[0157] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may 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 compatibility test instruction, the control signal generating device generates a control pilot signal to control the AC power supply to charge the sample to be tested through the control pilot 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 signal generating device also includes: a test chamber, a signal generator, and a grounded copper table, the signal generator is located in the test chamber, the sample to be tested and the charging gun are placed on the grounded copper table, the ground end of the AV LISN is grounded to the ground metal structure of the test chamber, and the signal generator is grounded to the ground metal structure of the test chamber; the grounded copper table includes a wooden table, a copper plate is laid on the wooden table, and the copper plate is directly plugged into the wall of the semi-anechoic chamber through a grounding strap, an insulating support with a thickness of 10 cm is laid on the copper plate, and the wooden table is 90 cm, 1 m, 3 m, or 10 m from the ground; Acquire 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 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 a measurement result of each test port; Analyzing the measurement results of each test port to obtain a test result; The conducted emission of the phase line corresponding to the test port is measured according to the test configuration parameters to obtain the measurement results of each test port, including: Recording 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 average value; Obtaining the line loss value of each test frequency point within the test frequency range; Calculate the compensated quasi-peak value and the compensated average value 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; Determining whether the compensated quasi-peak value is greater than a quasi-peak value threshold corresponding to the test frequency band in which 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 in which 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.

2. The electromagnetic compatibility testing method of the on-board charger according to claim 1, characterized in that: Obtain 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, 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.

3. The electromagnetic compatibility testing method of the on-board charger according to claim 1, 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 in which 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 in which 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-performing 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.

4. The electromagnetic compatibility testing method of the on-board charger according to claim 1, characterized in that: Analyze the measurement results of each test port to obtain test results, including: When the measurement results of each test port meet the corresponding limit range, the test result is determined to be a test pass; When at least one of the measurement results of the test ports does not meet the corresponding limit range, the test result is determined to be a test failure.

5. An electromagnetic compatibility test system for a vehicle charger, characterized in that: include: Main control device, signal generating device, AC line impedance network, 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 the AC power supply through the AC line impedance network, and the sample to be tested is connected to the signal generating device. 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 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 further used to: analyze the measurement results of each test port to obtain a test result; The main control device is specifically used 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 corresponds to a quasi-peak value and average value; Obtaining the line loss value of each test frequency point within the test frequency range; Calculate the compensated quasi-peak value and the compensated average value 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; Determining whether the compensated quasi-peak value is greater than a quasi-peak value threshold corresponding to the test frequency band in which 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 in which 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, obtaining a measurement result of the test port; The signal generating device includes: a test chamber, a signal generator, and a grounded copper table; the signal generator and the grounded copper table are located inside the test chamber; the sample to be tested and the charging gun are placed on the grounded copper table, the ground end of the AC line impedance network is grounded to the metal structure of the test chamber ground, and the signal generator is grounded to the metal structure of the test chamber ground; the grounded copper table includes a wooden table, a copper plate is laid on top of the wooden table, and the copper plate is directly plugged into the wall of the semi-anechoic chamber through a grounding strap, an insulating support with a thickness of 10 cm is laid above the copper plate, and the wooden table is 90 cm, 1 m, 3 m, or 10 m from the ground.

6. The electromagnetic compatibility test system for the on-board charger according to claim 5, characterized in that: The signal generator is used to generate a control guide signal to control the charging operation of the sample to be tested.

7. 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 testing method for the on-board charger according to any one of claims 1 to 4.

8. 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 4 is implemented.

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