Anti-interference detection equipment and detection method for electromagnetic waves

Abstract

The invention relates to the technical field of anti-interference detection, in particular to anti-interference detection equipment and a detection method for electromagnetic waves. Comprising an equipment base, a shielding box is rotationally installed on the equipment base, the interior of the shielding box is divided into multiple groups of different cavities, the cavities are used for containing electronic products, and the multiple groups of cavities can be isolated from one another and can also be communicated with one another; the number of the test racks is consistent with that of the cavities, one group of test racks corresponds to one group of cavities, and different types of electromagnetic interference generators are mounted on the plurality of groups of test racks; in addition to a single type of interference test, a combined interference test can also be carried out, various interference signals with different frequencies and intensities are applied at the same time, a complex actual electromagnetic environment is simulated, and the detection efficiency and the reliability of a test result are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-interference detection, and in particular to an anti-interference detection device and a detection method for electromagnetic waves. Background Art

[0002] The test of electronic products' ability to resist electromagnetic interference revolves around simulating interference environments, monitoring product performance, and analyzing data to evaluate the stability of products in complex electromagnetic environments.

[0003] During the testing process, electronic products undergo initial performance testing in an interference-free environment, recording key performance indicators under normal operating conditions. The electronic products are then placed in a shielded room, and different types of interference signals are generated using an electromagnetic interference generator. In actual use, the electromagnetic interference faced by electronic products is complex and diverse, and a single type of electromagnetic interference generator cannot fully simulate it.

[0004] In the electromagnetic interference testing of electronic products, different types of electromagnetic interference generators have their own characteristics and applicable scenarios. Usually, multiple types need to be selected for testing to fully evaluate the anti-interference ability of electronic products.

[0005] Traditional electromagnetic interference testing equipment for electronic products has limited functionality and is typically only capable of performing a single type of interference test, such as electrostatic discharge testing or radio frequency electromagnetic field immunity testing. Completing multiple types of interference testing requires the use of multiple different devices, which not only takes up a lot of space but also creates a cumbersome and inefficient testing process. This solution, through an adjustable chamber structure and multiple test racks, allows a single device to perform multiple types of interference testing, including combined interference testing, effectively addressing the shortcomings of traditional equipment. Summary of the Invention

[0006] (1) Technical issues

[0007] The present invention aims to at least solve the problem of needing to perform resistance tests to a single specific interference or multiple combinations thereof from the perspectives of different test item requirements, interference scenario simulation, etc.

[0008] (2) Technical content

[0009] This solution provides an anti-interference detection device for electromagnetic waves, which is achieved by the following specific technical means:

[0010] The equipment base has a shielding box rotatably mounted thereon, which is divided into multiple groups of different chambers, and the multiple groups of chambers can be isolated from each other or connected to each other;

[0011] Test racks, one set of test racks corresponds to one set of chambers, and the test racks are used to install electromagnetic interference generators;

[0012] The data detection unit includes multiple sets of real-time data monitoring and data acquisition equipment connected to electronic equipment, such as spectrum analyzers, oscilloscopes and other instruments, which monitor the working status and signal changes of electronic products in real time.

[0013] Preferred technical solution 1: multiple sets of integrally formed shielding partitions are raised and lowered in the inner cavity of the shielding box; when the shielding partitions move down, the inner cavity of the shielding box is divided into multiple sets of chambers distributed along the periphery of the shielding box; when the shielding partitions move up, the isolation between the multiple sets of chambers is eliminated.

[0014] Preferred Technical Solution 3: The bottom of the shielding box is rotatably connected to the equipment base via a support shaft, and a rotating rack is rotatably sleeved on the support shaft; the test rack includes a track fixed to the side of the rotating rack, a slider slides on the track, and a shielding sealing door is fixed on the slider for closing or opening a product access window formed on the outer side wall of the chamber;

[0015] The platform on the slider is used to place a type of electromagnetic interference generator.

[0016] Preferred technical solution four: a telescopic rod 2 is further connected between the track and the slider.

[0017] Preferred technical solution five: A temperature and humidity regulating device is provided in the shielding box.

[0018] This solution also discloses a method for detecting anti-interference of electromagnetic waves, comprising the following steps:

[0019] 1. Preparation before testing

[0020] 1.1 Equipment Inspection and Calibration

[0021] Check the shielding performance of the shielding box;

[0022] Calibrate instruments such as electromagnetic interference generators, spectrum analyzers, and oscilloscopes;

[0023] 1.2 Test Environment Setup

[0024] Place the equipment in a location that meets the test requirements, turn on the temperature and humidity control device in the shielding box, set the temperature inside the box to 23±2℃, and control the humidity at 45%-55%;

[0025] 1.3 Test sample preparation

[0026] Select the electronic product to be tested;

[0027] 2. Single interference test operation

[0028] 2.1 Chamber Setup

[0029] Divide the inner cavity of the shielding box into multiple independent chambers; select the corresponding number of chambers according to the test requirements, and each chamber is used to place an electronic product to be tested;

[0030] 2.2 Installation and setting of electromagnetic interference generator

[0031] Place the required type of electromagnetic interference generator on the support table of the corresponding chamber test frame;

[0032] 2.3 Test Execution

[0033] Close the shielded sealed door, start the electromagnetic interference generator, and transmit interference signals into the chamber. Simultaneously, activate the spectrum analyzer, oscilloscope, and other equipment in the data detection unit to monitor the operating status and signal changes of the electronic product in real time. Record the interference signal parameters (frequency, intensity) when the product experiences performance degradation or functional abnormalities (such as freezes, restarts, and data loss), as well as the time required for the product to resume normal operation.

[0034] 2.4 End of test and sample processing

[0035] After the test is completed, turn off the electromagnetic interference generator first, then open the shielding sealing door and take out the test sample;

[0036] 3. Combined interference test operation

[0037] 3.1 Chamber communication settings

[0038] Eliminate isolation between groups of chambers;

[0039] 3.2 Installation and Setup of Multiple Types of Electromagnetic Interference Generators

[0040] Different types of electromagnetic interference generators are installed on the brackets of each test frame.

[0041] 3.3 Test Execution

[0042] Close all shielding sealing doors and start each electromagnetic interference generator in sequence to simultaneously transmit interference signals into the shielding box; the data detection unit monitors the working status and signal changes of all electronic products in the combined interference environment in real time and records relevant test data;

[0043] 3.4 Test completion and data processing

[0044] After the test is completed, turn off all electromagnetic interference generators, open the shielding sealing door, and take out the test sample;

[0045] (3) Technical effects

[0046] The above structure enables this solution to have the following beneficial effects:

[0047] This solution innovatively divides the interior of the shielding box into multiple chambers that can flexibly switch between isolation and connectivity. Combined with multiple test racks and different types of electromagnetic interference generators, it enables efficient switching between single interference testing and combined interference testing.

[0048] Compared with traditional single-function detection equipment, this design can simulate complex electromagnetic environments more comprehensively and efficiently, greatly improving detection efficiency and the reliability of test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0050] Figure 1 This is a schematic diagram of the overall structure of this scheme;

[0051] Figure 2 Test state diagram for this solution

[0052] Figure 3 This is the top view of this scheme;

[0053] Figure 4 This is the test stand view for this solution;

[0054] Figure 5 This is a structural diagram of the shielding box of this scheme;

[0055] Figure 6 This is the connection status diagram of multiple groups of test racks in this solution.

[0056] Among them, 1. Equipment base, 2. Shielding box, 21. Chamber, 22. Product pick-up and placement window, 3. Sliding shielding partition, 4. Telescopic rod 1, 5. Data detection unit, 6. Instrument rack, 7. Support shaft, 8. Turntable, 9. Test rack, 91. Track, 92. Slider, 93. Shielding sealing door, 94. Support platform, 95. Telescopic rod 2, 10. Electromagnetic interference generator, 101. Detection end. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0058] See also Figures 1-6 , including a device base 1, a test frame 9, and a data detection unit 5, wherein:

[0059] The bottom of the shielding box 2 is fixedly connected to a support shaft 7 that is rotatably connected to the equipment base 1. A rotating motor is installed in the equipment base 1, and the output shaft of the rotating motor is fixedly connected to the support shaft 7 to drive the support shaft 7 to rotate. The shielding box 2 is made of a double-layer high-permeability metal material (such as a composite of Permalloy and copper), and the middle is filled with an absorbing material (such as ferrite absorbing cotton) to enhance the electromagnetic shielding performance of the shielding box 2 and reduce the impact of external electromagnetic interference on the test results. The inner cavity of the shielding box 2 is divided into multiple groups of different chambers 21. The chambers 21 are used to place electronic products. The multiple groups of chambers 21 can be isolated from each other or connected to each other;

[0060] The number of test racks 9 is the same as the number of chambers 21, and one group of test racks 9 corresponds to one group of chambers 21. Different types of electromagnetic interference generators 10 are installed on multiple groups of test racks 9. The electromagnetic interference generators 10 are classified according to interference signal waveform, interference signal frequency characteristics, and function and application scenario. In addition to a single type of interference test, combined interference testing can also be performed, and multiple interference signals of different frequencies and intensities can be applied simultaneously to simulate a complex actual electromagnetic environment.

[0061] The data detection unit 5 includes multiple sets of real-time data monitoring and data acquisition equipment connected to the electronic device, such as existing spectrum analyzers, oscilloscopes, and other instruments, which monitor the working status and signal changes of the electronic product in real time; record the interference signal parameters (frequency, intensity) when the product experiences performance degradation or functional abnormalities (such as freezing, restarting, and data loss), as well as the time required for the product to resume normal operation; add a data preprocessing module to the data detection unit 5 to perform preprocessing operations such as filtering and amplification on the raw data collected by the spectrum analyzer, oscilloscope, etc., to improve the accuracy and stability of the data. At the same time, a high-speed data transmission interface (such as USB 3.0 or Ethernet interface) is used to achieve rapid data transmission and storage;

[0062] An instrument rack 6 is fixed on the top of the shielding box 2 for placing the real-time data monitoring and data acquisition equipment in the data detection unit 5 .

[0063] In one set of embodiments

[0064] See also Figure 5 , multiple groups of integrally formed shielding partitions 3 are raised and lowered in the inner cavity of the shielding box 2 (specifically, a telescopic rod 4 is installed in the control cover installed on the top of the shielding box 2, and the telescopic end of the bottom of the telescopic rod 4 is fixedly connected to the shielding partition 3, and the height change of the shielding partition 3 is controlled by the telescopic movement of the telescopic rod 4). When the shielding partition 3 moves down, the inner cavity of the shielding box 2 is divided into multiple groups of chambers 21 distributed along the circumference of the shielding box 2; when the shielding partition 3 moves up, the isolation between the multiple groups of chambers 21 is eliminated, and the inner cavity of the shielding box 2 becomes one, thereby achieving the technical effects of single interference test and combined interference test;

[0065] The coordinated design of the shielding partition 3 and the telescopic rod 4 allows the internal chamber structure of the shielding box 2 to be changed through a simple lifting action, which is convenient to operate and has a stable structure; the telescopic rod 4 is installed in the control cover, which can not only ensure its operational stability, but also effectively protect the telescopic rod 1 from external electromagnetic interference and physical damage.

[0066] In one set of embodiments

[0067] See also Figure 4 、 Figure 6 A rotating frame 8 is rotatably sleeved on the support shaft 7, and the rotating frame 8 is fixed to the equipment base 1; the test frame 9 includes a track 91 fixed to the side of the rotating frame 8, a slider 92 slides on the track 91, and a second telescopic rod 95 is connected between the track 91 and the slider 92, that is, the outer shell of the second telescopic rod 95 is fixed to the protruding support of the slider 92, and the telescopic end is fixed to the support on the track 91. The slider 92 slides back and forth on the track 91 by the telescopic movement of the second telescopic rod 95, and a shielding sealing door 93 is fixed on the slider 92;

[0068] A product access window 22 is formed on the outer side wall of each group of chambers 21. The product access window 22 is closed or opened by sliding a slider 92 on a track 91 to control a shielding sealing door 93.

[0069] A support 94 is also fixed to the slider 92, and the support 94 is used to place a type of electromagnetic interference generator 10 (the electromagnetic interference generator 10 is equipped with a quick-change interface, and different types of electromagnetic interference generators 10 can be quickly replaced by plugging and unplugging, thereby improving the versatility and testing efficiency of the equipment). A shock-absorbing pad is provided on the support 94 to reduce the impact of vibration generated during the operation of the electromagnetic interference generator 10 on the test results, and the detection end 101 on the electromagnetic interference generator 10 is installed on the corresponding shielding sealing door 93. After the shielding sealing door 93 is closed, the electromagnetic interference generator 10 is started, and the detection end 101 transmits interference electromagnetic waves to the corresponding chamber 21.

[0070] In one set of embodiments

[0071] A temperature and humidity adjustment device (such as a micro air conditioner and humidifier / dehumidifier in the prior art) is provided in the shielding box 2, and a temperature and humidity sensor is provided on the inner wall of the shielding box 2 (the specific model, as well as its supporting power supply and control switch can also be provided by the manufacturer) to monitor the environmental parameters in the box in real time and transmit the data to the temperature and humidity adjustment device of the equipment. When the environmental parameters exceed the standard range (temperature 23±2℃, humidity 45%-55%), the temperature and humidity adjustment device is started to ensure the stability of the test environment.

[0072] This solution also discloses a method for detecting anti-interference of electromagnetic waves, comprising the following steps:

[0073] 1. Preparation before testing

[0074] 1.1 Equipment Inspection and Calibration

[0075] Check the shielding performance of the shielding box 2. Use a shielding effectiveness tester to detect electromagnetic leakage at each joint of the shielding box 2 and after the shielding sealing door 93 is closed to ensure that the shielding effectiveness meets the standard requirements (e.g., above 80dB). If leakage is found, use electromagnetic sealant to repair it or adjust the sealing structure in time.

[0076] Calibrate the electromagnetic interference generator 10, spectrum analyzer, oscilloscope and other instruments; according to the instrument manual, use a standard signal source to calibrate the output frequency and amplitude of the electromagnetic interference generator 10; use calibration components to calibrate the measurement accuracy of the spectrum analyzer and oscilloscope to ensure the accuracy of the test data;

[0077] 1.2 Test Environment Setup

[0078] Place the device in a location that meets the test requirements. Ensure there are no strong electromagnetic interference sources (such as substations and communication base stations) nearby, and keep away from vibration sources. Adjust the leveling feet on the device base 1 to keep the device level.

[0079] Turn on the temperature and humidity control device in the shielding box 2, set the temperature to 23±2℃, and the humidity to 45%-55%. Tests can only be carried out after the temperature and humidity are stable.

[0080] 1.3 Test sample preparation

[0081] Select the electronic product to be tested, ensure that it is in normal working condition, connect common software or run typical working procedures to simulate actual usage scenarios; use a connecting cable to correctly connect the electronic product to the data real-time monitoring and acquisition equipment (such as spectrum analyzer, oscilloscope) in the data detection unit 5 to ensure stable signal transmission;

[0082] 2. Single interference test operation

[0083] 2.1 Chamber 21 Setup

[0084] Start the telescopic rod 4 in the control cover to move the shielding partition 3 downward, dividing the inner cavity of the shielding box 2 into multiple groups of independent chambers 21; select the corresponding number of chambers 21 according to the test requirements, and each chamber 21 is used to place an electronic product to be tested;

[0085] 2.2 Installation and Setup of Electromagnetic Interference Generator 10

[0086] Place the desired type of electromagnetic interference generator 10 on the support 94 of the test rack 9 corresponding to the chamber 21 and secure it via a quick-change interface; set the output parameters of the electromagnetic interference generator 10, such as the frequency, amplitude, and waveform of the interference signal, according to the test standard (such as the IEC 61000 series standard);

[0087] Use the second telescopic rod 95 to adjust the position of the slider 92 on the track 91 so that the detection end 101 of the electromagnetic interference generator 10 is aligned with the electronic product in the chamber 21, and use the scale mark on the track 91 to ensure that the distance between the detection end 101 and the electronic product meets the test requirements;

[0088] 2.3 Test Execution

[0089] Close the shielded sealing door 93 to ensure that the chamber 21 is well sealed; start the electromagnetic interference generator 10 to emit an interference signal into the chamber 21; and simultaneously start the spectrum analyzer, oscilloscope and other equipment in the data detection unit 5 to monitor the working status and signal changes of the electronic product in real time; record the interference signal parameters (frequency, intensity) when the product experiences performance degradation or functional abnormality (such as freezing, restarting, data loss), as well as the time required for the product to resume normal operation;

[0090] 2.4 End of test and sample processing

[0091] After the test is completed, the electromagnetic interference generator 10 is turned off, and then the shielding sealing door 93 is opened to take out the test sample; the test data is saved and preliminarily analyzed. If multiple tests are required on the same product, the above steps can be repeated;

[0092] 3. Combined interference test operation

[0093] 3.1 Chamber 21 communication setting

[0094] Activate the telescopic rod 1 4 to move the shielding partition 3 upwards, so that the inner cavity of the shielding box 2 becomes one, eliminating the isolation between the multiple groups of chambers 21; at this time, multiple interference signals of different frequencies and intensities can be applied to multiple electronic products at the same time;

[0095] 3.2 Installation and Setup of Multiple Types of Electromagnetic Interference Generators 10

[0096] Different types of electromagnetic interference generators 10 are installed on the support 94 of each test frame 9, and the output parameters of each generator are set according to the test requirements; for example, an electrostatic discharge generator, a radio frequency interference generator and an electrical fast transient pulse group generator are set at the same time to simulate different types of electromagnetic interference respectively;

[0097] 3.3 Test Execution

[0098] Close all shielding sealing doors 93 to ensure that the shielding box 2 is completely sealed; start each electromagnetic interference generator 10 in sequence to simultaneously transmit interference signals into the shielding box 2; the data detection unit 5 monitors the working status and signal changes of all electronic products in the combined interference environment in real time and records relevant test data;

[0099] 3.4 Test completion and data processing

[0100] After the test is completed, all electromagnetic interference generators 10 are turned off, the shielding sealing door 93 is opened, and the test sample is taken out; and the collected data is analyzed using the data detection unit 5.

[0101] 4. Equipment maintenance and storage

[0102] After the test is completed, clean and maintain the equipment; clean the dust and debris in the shielding box 2, and check whether the connecting cables of each instrument and equipment are damaged; return the electromagnetic interference generator 10 and other instruments and equipment to their original locations, turn off the power of the equipment, and take moisture-proof and dust-proof measures for the equipment.

[0103] The undisclosed parts in the present invention are all prior art, and their specific structures and working principles are not described in detail here.

[0104] Unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application.

[0105] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An anti-interference detection device for electromagnetic waves, characterized in that: include A device base (1) is rotatably mounted with a shielding box (2), which is divided into multiple groups of different chambers (21) inside the shielding box (2). The chambers (21) are used to place electronic products. The multiple groups of chambers (21) can be isolated from each other or can be interconnected. The number of test racks (9) is the same as the number of chambers (21), and different types of electromagnetic interference generators (10) are installed on multiple groups of test racks (9); The data detection unit (5) includes multiple sets of real-time data monitoring and data acquisition equipment connected to the electronic equipment, and is used for real-time monitoring of the working status and signal changes of the electronic product.

2. The anti-interference detection device for electromagnetic waves according to claim 1, characterized in that: Multiple groups of integrally formed shielding partitions (3) are raised and lowered in the inner cavity of the shielding box (2), and the multiple groups of chambers (21) are controlled to be in an isolated state or an integrally connected state by the raising and lowering of the shielding partitions (3).

3. The anti-interference detection device for electromagnetic waves according to claim 1, characterized in that: An instrument rack (6) is fixed on the top of the control cover and is used to place the real-time data monitoring and data acquisition equipment in the data detection unit (5).

4. The anti-interference detection device for electromagnetic waves according to claim 1, characterized in that: The bottom of the shielding box (2) is fixedly connected to a support shaft (7) rotatably connected to the device base (1), and a rotating frame (8) is rotatably sleeved on the support shaft (7), and the rotating frame (8) is fixedly connected to the device base (1); The test rack (9) includes a track (91) fixed to the side of the rotating rack (8), a slider (92) sliding on the track (91), and a shielding sealing door (93) fixed on the slider (92); a product access window (22) is formed on the outer side wall of each group of chambers (21), and the shielding sealing door (93) is used to close or open the product access window (22); A support platform (94) is also fixedly connected to the slider (92). The support platform (94) is used to place a type of electromagnetic interference generator (10), and the detection end (101) on the electromagnetic interference generator (10) is installed on the corresponding shielding sealing door (93).

5. The anti-interference detection device for electromagnetic waves according to claim 4, characterized in that: A second telescopic rod (95) is also connected between the track (91) and the slider (92).

6. The anti-interference detection device for electromagnetic waves according to claim 1, characterized in that: A temperature and humidity regulating device is provided in the shielding box (2) for adjusting the environment in the chamber (21).

7. The anti-interference detection device for electromagnetic waves according to claim 1, characterized in that: The electromagnetic interference generator (10) is classified according to one of the following categories: interference signal waveform classification, interference signal frequency characteristic classification, and function and application scenario classification.

8. A method for electromagnetic wave anti-interference detection according to claims 1-7, characterized in that: The steps include:

1. Preparation before the test; This includes equipment inspection, environmental setup, and sample preparation; 2. Single interference test operation; 2.1 Chamber (21) Setup Activating a telescopic rod (4) in the control cover to move the shielding partition (3) downward, thereby dividing the inner cavity of the shielding box (2) into multiple independent chambers (21); 2.2 Installation and setting of electromagnetic interference generator (10) Placing the electromagnetic interference generator (10) of the required type on the support platform (94) of the test rack (9) corresponding to the chamber (21) and fixing it through a quick-change interface; 2.3 Test Execution The shielding sealing door (93) is closed, and the electromagnetic interference generator (10) is started to transmit an interference signal into the chamber (21), and the data detection unit (5) is started at the same time to monitor the working status and signal changes of the electronic product in real time; 2.4 End of test and sample processing After the test is completed, the electromagnetic interference generator (10) is turned off first, and then the shielding sealing door (93) is opened to take out the test sample; Save and preliminarily analyze the test data. If you need to test the same product multiple times, repeat the above steps; 3. Combined interference test operation 3.1 Chamber (21) connection setting Activate telescopic rod 1 (4) to move the shielding partition (3) upward, so that the inner cavity of the shielding box (2) becomes one, eliminating the isolation between the multiple groups of chambers (21); 3.2 Installation and Setup of Multiple Types of Electromagnetic Interference Generators (10) Different types of electromagnetic interference generators (10) are respectively installed on the support platforms (94) of the test racks (9), and the output parameters of each generator are set according to the test requirements; 3.3 Test Execution All shielding sealing doors (93) are closed to ensure that the shielding box (2) is sealed as a whole; each electromagnetic interference generator (10) is started in sequence to simultaneously transmit interference signals into the shielding box (2); a data detection unit (5) monitors the working status and signal changes of all electronic products in the combined interference environment in real time and records relevant test data; 3.4 Test completion and data processing After the test is completed, all electromagnetic interference generators (10) are turned off, the shielding sealing door (93) is opened, and the test sample is taken out; and the collected data is analyzed.

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