Method, apparatus and device for testing electromagnetic pulse interference resistance of electromagnetic relay

Abstract

A method, apparatus and device for testing electromagnetic pulse interference resistance of an electromagnetic relay. An electromagnetic interference testing signal is synthesized by processing an electromagnetic interference signal in an actual environment, and then the electromagnetic interference testing signal in a time domain is used to test the electromagnetic pulse interference resistance performance of the electromagnetic relay. The synthesized electromagnetic interference testing signal can be stored in a synthesized signal generator, and when subsequently testing the electromagnetic pulse interference resistance performance of the electromagnetic relay, electromagnetic interference testing signals can be directly generated by means of the synthesized signal generator, without depending on an actual electromagnetic interference source. The technical problem that a traditional electromagnetic relay pulse interference testing method needs to use a real electromagnetic interference source for testing, while the real electromagnetic interference source is difficult to obtain and has high cost, resulting in that the method is not suitable for popularization and application, is solved.

Description

Method, device and equipment for testing electromagnetic relay against electromagnetic pulse interference

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 14, 2023, with application number 202311720261.6 and invention name “A method, device and equipment for testing electromagnetic relays against electromagnetic pulse interference”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of electromagnetic protection technology, and in particular to a method, device and equipment for testing electromagnetic relays against electromagnetic pulse interference. Background Art

[0003] Electromagnetic relay immunity testing is a critical procedure for evaluating the relay's performance in electromagnetic environments, particularly its resistance to EMP interference. This test is typically used to ensure the relay's proper operation under harsh electromagnetic conditions, thereby guaranteeing system stability and reliability. Traditional methods for testing electromagnetic relays using pulse interference require the use of a real EMP source, which is difficult and costly to obtain, making it unsuitable for widespread application.

[0004] Summary of the Invention

[0005] The present invention provides an electromagnetic relay anti-electromagnetic pulse interference test method, device and equipment, which are used to solve the technical problem that the traditional electromagnetic relay pulse interference test method requires the use of a real electromagnetic interference source for testing, which is difficult to obtain and costly, making it unsuitable for popularization and application.

[0006] In view of this, a first aspect of the present invention provides a method for testing electromagnetic relays against electromagnetic pulse interference, comprising:

[0007] Collect electromagnetic interference signals in the actual environment and record the time domain waveform of the electromagnetic interference signals;

[0008] Converting electromagnetic interference signals in the time domain into electromagnetic interference signals in the frequency domain;

[0009] According to the test requirements, the target frequency component is selected from the electromagnetic interference signal in the frequency domain, and the frequency domain model of the electromagnetic interference signal is established based on the target frequency cost;

[0010] Perform time-frequency transformation on the frequency domain model of the electromagnetic interference signal to synthesize the electromagnetic interference test signal in the time domain;

[0011] The electromagnetic interference test signal in the time domain is used to test the electromagnetic relay's anti-electromagnetic pulse interference performance.

[0012] Optionally, the frequency domain model of the electromagnetic interference signal is:

[0013] Where X(f) is the frequency domain model of the electromagnetic interference signal, N is the number of frequency components, Ai is the amplitude of the i-th frequency component, j is the imaginary unit, φ i is the phase of the i-th frequency component, δ(·) is the characteristic Dirac function, f is the frequency variable, f i is the i-th frequency component.

[0014] Optionally, the electromagnetic relay's anti-electromagnetic pulse interference performance is tested using a time-domain electromagnetic interference test signal, including:

[0015] Adjust the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain according to test requirements;

[0016] Radiate a time-domain electromagnetic interference test signal to the electromagnetic relay and record the response of the electromagnetic relay;

[0017] The response of the electromagnetic relay under the electromagnetic interference test signal is compared with the response of the electromagnetic relay under the electromagnetic interference signal in the actual environment. If the error is within the preset range, the electromagnetic interference test signal in the time domain is used to test the electromagnetic pulse interference resistance of the electromagnetic relay. If the error is not within the preset range, the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain is readjusted.

[0018] Optionally, the electromagnetic relay's anti-electromagnetic pulse interference performance is tested using a time-domain electromagnetic interference test signal, including:

[0019] Adjust the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain according to test requirements;

[0020] Radiate a time-domain electromagnetic interference test signal to the electromagnetic relay and record the response of the electromagnetic relay;

[0021] The response of the electromagnetic relay under the electromagnetic interference test signal is compared with the response of the electromagnetic relay under the electromagnetic interference signal in the actual environment. If the error is within the preset range, the electromagnetic interference test signal in the time domain is used to test the electromagnetic pulse interference resistance of the electromagnetic relay. If the error is not within the preset range, the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain is readjusted.

[0022] Optionally, after testing the electromagnetic relay's anti-electromagnetic pulse interference performance using a time-domain electromagnetic interference test signal, the method further includes:

[0023] The electromagnetic interference test signal in the time domain is used to repeatedly test the electromagnetic pulse interference resistance of the electromagnetic relay, and the average of the multiple test results is taken as the final test result.

[0024] Optionally, after repeatedly testing the electromagnetic relay's electromagnetic pulse interference resistance performance multiple times using a time-domain electromagnetic interference test signal and taking an average of the multiple test results as a final test result, the method further includes:

[0025] Generate electromagnetic relay's anti-electromagnetic pulse interference performance test report.

[0026] A second aspect of the present invention provides an electromagnetic relay anti-electromagnetic pulse interference test device, comprising:

[0027] The signal acquisition module is used to collect electromagnetic interference signals in the actual environment and record the time domain waveform of the electromagnetic interference signals;

[0028] A signal conversion module, used to convert the electromagnetic interference signal in the time domain into the electromagnetic interference signal in the frequency domain;

[0029] The frequency domain model building module is used to select the target frequency component from the electromagnetic interference signal in the frequency domain according to the test requirements, and to establish the frequency domain model of the electromagnetic interference signal based on the target frequency cost;

[0030] A test signal synthesis module is used to perform time-frequency transformation on the frequency domain model of the electromagnetic interference signal and synthesize the electromagnetic interference test signal in the time domain;

[0031] The test module is used to test the electromagnetic relay's anti-electromagnetic pulse interference performance by using a time-domain electromagnetic interference test signal.

[0032] Optionally, the frequency domain model of the electromagnetic interference signal is:

[0033] Where X(f) is the frequency domain model of the electromagnetic interference signal, N is the number of frequency components, Ai is the amplitude of the i-th frequency component, j is the imaginary unit, φ i is the phase of the i-th frequency component, δ(·) is the characteristic Dirac function, f is the frequency variable, f i is the i-th frequency component.

[0034] Optionally, the test module is specifically used to:

[0035] Adjust the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain according to test requirements;

[0036] Radiate a time-domain electromagnetic interference test signal to the electromagnetic relay and record the response of the electromagnetic relay;

[0037] The response of the electromagnetic relay under the electromagnetic interference test signal is compared with the response of the electromagnetic relay under the electromagnetic interference signal in the actual environment. If the error is within the preset range, the electromagnetic interference test signal in the time domain is used to test the electromagnetic pulse interference resistance of the electromagnetic relay. If the error is not within the preset range, the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain is readjusted.

[0038] Optionally, the test module is also used to:

[0039] The electromagnetic interference test signal in the time domain is used to repeatedly test the electromagnetic pulse interference resistance of the electromagnetic relay, and the average of the multiple test results is taken as the final test result.

[0040] Optionally, it also includes:

[0041] The report module is used to generate the electromagnetic relay's anti-electromagnetic pulse interference performance test report.

[0042] A third aspect of the present invention provides an electromagnetic relay anti-electromagnetic pulse interference testing device, the device comprising a processor and a memory:

[0043] The memory is used to store program code and transmit the program code to the processor;

[0044] The processor is used to execute the electromagnetic relay anti-electromagnetic pulse interference testing method described in any one of the first aspects according to the instructions in the program code.

[0045] From the above technical solutions, it can be seen that the electromagnetic relay anti-electromagnetic pulse interference testing method provided by the present invention has the following advantages:

[0046] The electromagnetic relay anti-electromagnetic pulse interference test provided by the present invention synthesizes an electromagnetic interference test signal by processing the electromagnetic interference signal in the actual environment, and then uses the time domain electromagnetic interference test signal to test the electromagnetic relay's anti-electromagnetic pulse interference performance. The electromagnetic interference test signal can be stored in a synthetic signal generator after synthesis. When the electromagnetic relay's anti-electromagnetic pulse interference performance is subsequently tested, the electromagnetic interference test signal can be directly generated by the synthetic signal generator without relying on the actual electromagnetic interference source. This solves the technical problem that the traditional electromagnetic relay pulse interference test method needs to use a real electromagnetic interference source for testing, which is difficult and costly to obtain and is not suitable for popularization and application.

[0047] At the same time, testers can easily adjust the frequency, amplitude and phase of the synthesized electromagnetic interference test signal according to test requirements, and can flexibly simulate various electromagnetic interference conditions to evaluate the anti-interference performance of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0049] FIG1 is a flow chart of a method for testing electromagnetic relays against electromagnetic pulse interference provided in an embodiment of the present invention;

[0050] FIG2 is a schematic structural diagram of an electromagnetic relay anti-electromagnetic pulse interference testing device provided in an embodiment of the present invention;

[0051] FIG3 is a schematic structural diagram of an electromagnetic relay anti-electromagnetic pulse interference testing device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0053] For ease of understanding, please refer to FIG1 . The present invention provides an embodiment of a method for testing electromagnetic relays against electromagnetic pulse interference, comprising:

[0054] Step 101: Collect electromagnetic interference signals in an actual environment and record the time domain waveforms of the electromagnetic interference signals.

[0055] It should be noted that the electromagnetic interference signal must first be collected in the actual test environment. This can be accomplished using an electromagnetic induction detector or other appropriate sensor. The collected signal is typically a time-domain signal, i.e., a waveform that varies over time.

[0056] Step 102: Convert the electromagnetic interference signal in the time domain into an electromagnetic interference signal in the frequency domain.

[0057] It should be noted that the waveform, duration, and power spectrum of the time-domain electromagnetic interference signal can be analyzed. The time-domain electromagnetic interference signal is then converted into a frequency-domain electromagnetic interference signal using the Fourier transform. The Fourier transform decomposes the time-domain signal into sine and cosine components of different frequencies, each with its own amplitude and phase. This allows the frequency distribution of the signal to be visualized in the frequency domain.

[0058] Step 103: According to the test requirements, a target frequency component is selected from the electromagnetic interference signal in the frequency domain, and a frequency domain model of the electromagnetic interference signal is established based on the target frequency cost.

[0059] It should be noted that multiple frequency components may be present in the frequency domain signal analysis results. The frequency components of interest need to be selected based on the signal characteristics and test requirements. These frequency components usually correspond to important features in the electromagnetic interference signal. Based on the selected frequency components, a frequency domain model can be established. The electromagnetic interference signal is usually represented by the superposition of sine waves. The frequency domain model of the electromagnetic interference signal is:

[0060] Where X(f) is the frequency domain model of the electromagnetic interference signal, N is the number of frequency components, Ai is the amplitude of the i-th frequency component, j is the imaginary unit, φ i is the phase of the i-th frequency component, δ(·) is the characteristic Dirac function, f is the frequency variable, f i is the i-th frequency component.

[0061] Step 104: Perform time-frequency transformation on the frequency domain model of the electromagnetic interference signal to synthesize a time domain electromagnetic interference test signal.

[0062] It should be noted that the signal for testing the electromagnetic relay's anti-electromagnetic pulse interference performance needs to be a time domain signal. Therefore, it is necessary to perform a time domain transformation on the frequency domain model of the electromagnetic interference signal, and transform the frequency domain model of the electromagnetic interference signal into a time domain electromagnetic interference test signal through inverse Fourier transform. The transformed time domain signal is the synthesized electromagnetic interference test signal.

[0063] Step 105: Use a time-domain electromagnetic interference test signal to test the electromagnetic relay's anti-electromagnetic pulse interference performance.

[0064] It should be noted that after synthesizing the time domain electromagnetic interference test signal, the time domain electromagnetic interference test signal is radiated to the electromagnetic relay, and then the response of the electromagnetic relay is recorded, so as to analyze the electromagnetic relay's anti-electromagnetic pulse interference performance.

[0065] Specifically, after synthesizing the time-domain electromagnetic interference test signal, the time-domain electromagnetic interference test signal can be verified first. The amplitude and / or phase and / or frequency of the time-domain electromagnetic interference test signal can be adjusted according to the test requirements. Then, the time-domain electromagnetic interference test signal is radiated to the electromagnetic relay, and the response of the electromagnetic relay is recorded. The response of the electromagnetic relay under the electromagnetic interference test signal is compared with the response of the electromagnetic relay under the electromagnetic interference signal in the actual environment. If the comparison result error is within a preset range, the time-domain electromagnetic interference test signal is used to test the electromagnetic relay's anti-electromagnetic pulse interference performance. If the comparison result error is not within the preset range, the amplitude and / or phase and / or frequency of the time-domain electromagnetic interference test signal is readjusted, and the response of the corresponding electromagnetic relay is recorded again until the comparison result error is within the preset range. Verifying the accuracy and rationality of the synthesized signal can ensure that the synthesized signal well simulates the characteristics of the real electromagnetic interference signal.

[0066] To ensure the reliability and stability of the results, the electromagnetic relay's EMP performance can be repeatedly tested using time-domain EMI test signals. The average of these multiple test results is taken as the final test result. After the test is completed, a test report for the electromagnetic relay's EMP performance is generated, including the detailed test process, test conditions, relay response data, and analysis and evaluation of the test results.

[0067] The electromagnetic relay anti-electromagnetic pulse interference test provided by the present invention synthesizes an electromagnetic interference test signal by processing the electromagnetic interference signal in the actual environment, and then uses the time domain electromagnetic interference test signal to test the electromagnetic relay's anti-electromagnetic pulse interference performance. The electromagnetic interference test signal can be stored in a synthetic signal generator after synthesis. When the electromagnetic relay's anti-electromagnetic pulse interference performance is subsequently tested, the electromagnetic interference test signal can be directly generated by the synthetic signal generator without relying on the actual electromagnetic interference source. This solves the technical problem that the traditional electromagnetic relay pulse interference test method needs to use a real electromagnetic interference source for testing, which is difficult and costly to obtain and is not suitable for popularization and application.

[0068] At the same time, testers can easily adjust the frequency, amplitude and phase of the synthesized electromagnetic interference test signal according to test requirements, and can flexibly simulate various electromagnetic interference conditions to evaluate the anti-interference performance of the relay.

[0069] For ease of understanding, please refer to FIG2 . The present invention provides an embodiment of an electromagnetic relay anti-electromagnetic pulse interference testing device, comprising:

[0070] The signal acquisition module is used to collect electromagnetic interference signals in the actual environment and record the time domain waveform of the electromagnetic interference signals;

[0071] A signal conversion module, used to convert the electromagnetic interference signal in the time domain into the electromagnetic interference signal in the frequency domain;

[0072] The frequency domain model building module is used to select the target frequency component from the electromagnetic interference signal in the frequency domain according to the test requirements, and to establish the frequency domain model of the electromagnetic interference signal based on the target frequency cost;

[0073] A test signal synthesis module is used to perform time-frequency transformation on the frequency domain model of the electromagnetic interference signal and synthesize the electromagnetic interference test signal in the time domain;

[0074] The test module is used to test the electromagnetic relay's anti-electromagnetic pulse interference performance by using a time-domain electromagnetic interference test signal.

[0075] The frequency domain model of electromagnetic interference signal is:

[0076] Where X(f) is the frequency domain model of the electromagnetic interference signal, N is the number of frequency components, Ai is the amplitude of the i-th frequency component, j is the imaginary unit, φ i is the phase of the i-th frequency component, δ(·) is the characteristic Dirac function, f is the frequency variable, f i is the i-th frequency component.

[0077] The test module is specifically used to:

[0078] Adjust the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain according to test requirements;

[0079] Radiate a time-domain electromagnetic interference test signal to the electromagnetic relay and record the response of the electromagnetic relay;

[0080] The response of the electromagnetic relay under the electromagnetic interference test signal is compared with the response of the electromagnetic relay under the electromagnetic interference signal in the actual environment. If the error is within the preset range, the electromagnetic interference test signal in the time domain is used to test the electromagnetic pulse interference resistance of the electromagnetic relay. If the error is not within the preset range, the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain is readjusted.

[0081] The test module is also used to:

[0082] The electromagnetic interference test signal in the time domain is used to repeatedly test the electromagnetic pulse interference resistance of the electromagnetic relay, and the average of the multiple test results is taken as the final test result.

[0083] The electromagnetic relay anti-electromagnetic pulse interference test device also includes:

[0084] The report module is used to generate the electromagnetic relay's anti-electromagnetic pulse interference performance test report.

[0085] For ease of understanding, please refer to FIG3 . The present invention provides an embodiment of an electromagnetic relay anti-electromagnetic pulse interference test device, wherein the device includes a processor and a memory.

[0086] The memory is used to store program code and transmit the program code to the processor;

[0087] The processor is used to execute the electromagnetic relay anti-electromagnetic pulse interference testing method of the present invention according to the instructions in the program code.

[0088] The electromagnetic relay anti-electromagnetic pulse interference test device and equipment provided in the present invention are used to perform the electromagnetic relay anti-electromagnetic pulse interference test method provided in the present invention. Its principles and technical effects are the same as those of the electromagnetic relay anti-electromagnetic pulse interference test method provided in the present invention, and will not be repeated here.

[0089] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for testing electromagnetic relay against electromagnetic pulse interference, characterized in that: include: Collect electromagnetic interference signals in the actual environment and record the time domain waveform of the electromagnetic interference signals; Converting electromagnetic interference signals in the time domain into electromagnetic interference signals in the frequency domain; According to the test requirements, the target frequency component is selected from the electromagnetic interference signal in the frequency domain, and the frequency domain model of the electromagnetic interference signal is established based on the target frequency cost; Perform time-frequency transformation on the frequency domain model of the electromagnetic interference signal and synthesize the electromagnetic interference test signal in the time domain; The electromagnetic interference test signal in the time domain is used to test the electromagnetic relay's anti-electromagnetic pulse interference performance.

2. The electromagnetic relay anti-electromagnetic pulse interference test method according to claim 1, characterized in that: The frequency domain model of electromagnetic interference signal is: Among them, X(f) is the frequency domain model of the electromagnetic interference signal, N is the number of frequency components, and A is i is the amplitude of the ith frequency component, j is an imaginary unit, φ i is the phase of the ith frequency component, δ(·) is the characteristic Dirac function, f is the frequency variable, and f i is the ith frequency component.

3. The electromagnetic relay anti-electromagnetic pulse interference testing method according to claim 1, characterized in that: The electromagnetic pulse interference resistance performance of the electromagnetic relay is tested using the electromagnetic interference test signal in the time domain, including: Adjust the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain according to the test requirements; Radiate the electromagnetic interference test signal in the time domain to the electromagnetic relay and record the response of the electromagnetic relay; The response of the electromagnetic relay under the electromagnetic interference test signal is compared with the response of the electromagnetic relay under the electromagnetic interference signal in the actual environment. If the error is within the preset range, the electromagnetic interference test signal in the time domain is used to test the electromagnetic pulse interference resistance of the electromagnetic relay. If the error is not within the preset range, the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain is readjusted.

4. The electromagnetic relay anti-electromagnetic pulse interference testing method according to claim 3, characterized in that: After testing the electromagnetic relay's anti-electromagnetic pulse interference performance using the time domain electromagnetic interference test signal, it also includes: The electromagnetic interference test signal in the time domain is used to repeatedly test the electromagnetic relay's anti-electromagnetic pulse interference performance, and the average of multiple test results is taken as the final test result.

5. The electromagnetic relay anti-electromagnetic pulse interference testing method according to claim 4, characterized in that: The electromagnetic interference test signal in the time domain is used to repeatedly test the electromagnetic relay's anti-electromagnetic pulse interference performance for multiple times, and the average of multiple test results is taken as the final test result, and the following is also included: Generate electromagnetic relay's anti-electromagnetic pulse interference performance test report.

6. An electromagnetic relay anti-electromagnetic pulse interference test device, characterized in that: include: A signal acquisition module is used to collect electromagnetic interference signals in the actual environment and record the time domain waveform of the electromagnetic interference signals; A signal conversion module, used for converting an electromagnetic interference signal in the time domain into an electromagnetic interference signal in the frequency domain; A frequency domain model building module is used to select a target frequency component from the electromagnetic interference signal in the frequency domain according to the test requirements, and to establish a frequency domain model of the electromagnetic interference signal based on the target frequency cost; A test signal synthesis module, used for performing time-frequency transformation on the frequency domain model of the electromagnetic interference signal and synthesizing the electromagnetic interference test signal in the time domain; The test module is used to test the electromagnetic pulse interference resistance performance of the electromagnetic relay by using the electromagnetic interference test signal in the time domain.

7. The electromagnetic relay anti-electromagnetic pulse interference test device according to claim 6, characterized in that: The test module is specifically used for: Adjust the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain according to the test requirements; Radiate the electromagnetic interference test signal in the time domain to the electromagnetic relay and record the response of the electromagnetic relay; The response of the electromagnetic relay under the electromagnetic interference test signal is compared with the response of the electromagnetic relay under the electromagnetic interference signal in the actual environment. If the error is within the preset range, the electromagnetic interference test signal in the time domain is used to test the electromagnetic pulse interference resistance of the electromagnetic relay. If the error is not within the preset range, the amplitude and / or phase and / or frequency of the electromagnetic interference test signal in the time domain is readjusted.

8. The electromagnetic relay anti-electromagnetic pulse interference test device according to claim 7, characterized in that: The test module is also used to: The electromagnetic interference test signal in the time domain is used to repeatedly test the electromagnetic relay's anti-electromagnetic pulse interference performance, and the average of multiple test results is taken as the final test result.

9. The electromagnetic relay anti-electromagnetic pulse interference test device according to claim 8, characterized in that: Also includes: The report module is used to generate the electromagnetic relay's anti-electromagnetic pulse interference performance test report.

10. An electromagnetic relay anti-electromagnetic pulse interference test device, characterized in that: The device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the electromagnetic relay anti-electromagnetic pulse interference testing method described in any one of claims 1-5 according to the instructions in the program code.

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