Rectification method for carrying out electromagnetic compatibility on electronic product

Abstract

The invention discloses a rectification method for carrying out electromagnetic compatibility on an electronic product, and belongs to the technical field of avionics control, and the rectification method comprises the steps: placing a tested electronic product in an electromagnetic compatibility shielding case through an electromagnetic compatibility test system and a test platform which are configured according to a laboratory standard; a signal line of a tested electronic product is electrically connected with the array filter board and then connected with the electromagnetic compatibility test system, and the electromagnetic compatibility test system collects output signals of the tested electronic product. The electromagnetic shielding case can shield radiation interference of the tested electronic product. Under the condition that the interference is effectively shielded or filtered, the test effect of the tested electronic product reaches the standard. On the basis, different testing effects can be obtained by adjusting and changing the filtering state of the signal line, so that the relationship between the internal circuit state of the tested electronic product and the filtering effect can be researched, and the circuit design of the tested electronic product is helped to be optimized to obtain the optimal state.

Description

Technical Field

[0001] The invention relates to the technical field of avionics product control, and in particular to a method for rectifying the electromagnetic compatibility of electronic products. Background Art

[0002] Electromagnetic compatibility is an important characteristic of avionics products. During the development of avionics products, electromagnetic compatibility design and test assessment are required. During the test, sometimes the indicators are out of tolerance and do not meet the requirements. Therefore, electromagnetic compatibility rectification is required to improve the performance and meet the test requirements. The existing electromagnetic compatibility rectification method is to continuously test various measures based on experience in order to achieve the best state. This approach is time-consuming and labor-intensive, and reduces the efficiency of rectification. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention proposes a method for rectifying the electromagnetic compatibility of electronic products, which solves the problem of low rectification efficiency in the existing electromagnetic compatibility rectification method.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0005] A method for rectifying electromagnetic compatibility of electronic products is provided, which comprises:

[0006] Step 1: Build an electromagnetic compatibility test system and test platform in the laboratory, where the electromagnetic compatibility test system includes a measurement receiver, a signal generator, an oscilloscope, an antenna, and a LISN;

[0007] Step 2: Mark the placement position of the electronic product to be tested on the test platform, and place an electromagnetic shielding chassis at the position;

[0008] Step 3, open the upper cover of the electromagnetic shielding chassis, place the electronic product to be tested, the array filter board and the wires in the electromagnetic shielding chassis, and the array filter board is provided with multiple filters;

[0009] Step 4: The signal line of the chassis socket of the tested electronic product is welded to one end of the corresponding filter on the array filter board through a wire with a pin, and the other end of the filter on the array filter board is also led out to the outside of the shielding chassis through a welding wire. The end of the wire is welded with a pin and connected to the test cable plug of the tested electronic product, and the upper cover of the electromagnetic shielding chassis is closed;

[0010] Step 5: Plug the test cable of the electronic product under test into the power supply connected to the LISN to perform electromagnetic compatibility rectification;

[0011] Step 6: The signal generator emits an interference signal, the antenna and the measuring receiver receive the signal of the electronic product under test, and the received signal is displayed through an oscilloscope;

[0012] Step 7: Adjust and change the filtering state of the signal of the chassis socket of the tested electronic product through the display results of the oscilloscope to obtain different test effects, until the interference is effectively shielded or filtered out, the electromagnetic compatibility test of the tested electronic product is qualified, and the electromagnetic compatibility rectification of the electronic product is completed.

[0013] In the above method, the electromagnetic compatibility test system and test platform of the laboratory standard configuration are used to place the electronic product under test in an electromagnetic compatibility shielding chassis. The signal of the chassis socket of the electronic product under test is welded to one end of the corresponding filter on the array filter board through a wire with a pin, and the other end of the filter on the array filter board is also led out to the outside of the shielding chassis through a welding wire. The pin at the end of the wire is welded and connected to the test cable plug of the electronic product under test, thereby filtering the signal of the chassis socket of the electronic product under test to filter out the conducted interference, and the electromagnetic shielding chassis can shield the radiated interference of the electronic product under test. Ideally, when these interferences are effectively shielded or filtered out, the test effect of the electronic product under test will be up to standard. On this basis, adjusting and changing the filtering state of the signal line can obtain different test effects, thereby studying the relationship between the internal circuit state of the electronic product under test and the filtering effect, thereby helping to optimize the circuit design of the electronic product under test to achieve the best state.

[0014] Furthermore, in step 7, the signal line of the chassis socket of the tested electronic product adjusts the filtering state by connecting different filters.

[0015] Furthermore, the electromagnetic shielding chassis is provided with a plurality of installation windows for installing array filter boards of various models, and the array filter boards are fixedly connected to the installation windows via conductive rubber plates.

[0016] Furthermore, the filter is a feed-through filter or a through-hole capacitor; the array filter plate is an aluminum alloy plate with a thickness of 1 to 2 mm.

[0017] The beneficial effects of the present invention are as follows: compared with the prior art, the method for rectifying the electromagnetic compatibility of electronic products in the present invention can quickly find the weak links in the electromagnetic compatibility of avionics products, improve and perfect them, and efficiently and quickly complete the electromagnetic compatibility rectification, thereby effectively ensuring scientific research and production and improving the performance of avionics products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flow chart of a method for rectifying the electromagnetic compatibility of electronic products. DETAILED DESCRIPTION

[0019] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0020] The present invention provides a method for rectifying electromagnetic compatibility of electronic products, which comprises:

[0021] Step 1: Build an electromagnetic compatibility test system and test platform in the laboratory, where the electromagnetic compatibility test system includes a measuring receiver, a signal generator, an oscilloscope, an antenna, and a LISN; the measuring receiver is used to receive the electromagnetic signal emitted by the electronic product under test; the signal generator is used as an interference source to simulate the external electromagnetic environment; the oscilloscope is used to graphically display the electromagnetic signal of the electronic product under test; and the antenna is used to receive the interference signal emitted by the signal generator.

[0022] Step 2: Mark the placement position of the electronic product to be tested on the test platform, and place an electromagnetic shielding chassis at the position;

[0023] Step 3, open the upper cover of the electromagnetic shielding chassis, place the electronic product to be tested, the array filter board and the wires in the electromagnetic shielding chassis, and the array filter board is provided with multiple filters;

[0024] Step 4: The signal line of the chassis socket of the electronic product under test is welded to one end of the corresponding filter on the array filter board through a wire with a pin, and the other end of the filter on the array filter board is also led out to the outside of the shielding chassis through a welding wire. The end of the wire is welded with a pin and connected to the test cable plug of the electronic product under test, and the upper cover of the electromagnetic shielding chassis is closed;

[0025] Step 5: Plug the test cable of the electronic product under test into the power supply connected to LISN to make electromagnetic compatibility corrections; LISN means Line Impedance Stabilization Network in Chinese, which is a device used to provide stable impedance between the device under test and the power supply. Its main function is to simulate the impedance characteristics in the actual power grid and ensure that the impedance of the power line remains stable during the test, so as to accurately evaluate the electromagnetic interference (EMI) and electromagnetic immunity (EMS) performance of the device under test.

[0026] Step 6: The signal generator emits an interference signal, the antenna and the measuring receiver receive the signal of the electronic product under test, and the received signal is displayed through an oscilloscope;

[0027] Step 7: Adjust and change the filtering state of the signal of the chassis socket of the tested electronic product through the display results of the oscilloscope to obtain different test results until the interference is effectively shielded or filtered out, the electromagnetic compatibility test of the tested electronic product is qualified, and the electromagnetic compatibility rectification of the electronic product is completed. Specifically, the signal line of the chassis socket of the tested electronic product is connected to different filters to adjust the filtering state.

[0028] Preferably, in order to facilitate the installation and fixation of the array filter board, a plurality of installation windows for installing the array filter board are provided on the electromagnetic shielding chassis, and the array filter board is fixedly connected to the installation window through a conductive rubber plate. Different types of array filter boards can be installed in different installation windows, which can be used to lead out different types of power lines or signal lines according to the situation. When the installation window is not in use, the installation window can be directly blocked with copper foil. The upper cover of the electromagnetic shielding chassis is tightly fitted with the conductive rubber plate to form a closed continuous conductive shielding shell.

[0029] Specifically, the filter is a feed-through filter or a through-hole capacitor; the array filter plate is an aluminum alloy plate with a thickness of 1 to 2 mm.

[0030] In summary, in a method for rectifying the electromagnetic compatibility of electronic products, the electromagnetic compatibility test system and test platform configured in the laboratory standard are used to place the electronic product under test in an electromagnetic compatibility shielding chassis. The signal of the chassis socket of the electronic product under test is welded to one end of the corresponding filter on the array filter board through a wire with a pin, and the other end of the filter on the array filter board is also led out to the outside of the shielding chassis through a welding wire. The pin at the end of the wire is welded and connected to the test cable plug of the electronic product under test, thereby filtering the signal of the chassis socket of the electronic product under test to filter out the conducted interference, and the electromagnetic shielding chassis can shield the radiated interference of the electronic product under test. Ideally, when these interferences are effectively shielded or filtered out, the test effect of the electronic product under test will be up to standard. On this basis, adjusting and changing the filtering state of the signal line can obtain different test effects, thereby studying the relationship between the internal circuit state of the electronic product under test and the filtering effect, thereby helping to optimize the circuit design of the electronic product under test to achieve the best state.

[0031] Compared with the prior art, the electromagnetic compatibility rectification method for electronic products in the present invention can quickly find the weak links in the electromagnetic compatibility of avionics products, improve and perfect them, and efficiently and quickly complete the electromagnetic compatibility rectification, thereby effectively ensuring scientific research and production and improving the performance of avionics products.

Claims

1. A method for rectifying the electromagnetic compatibility of electronic products, characterized in that: include: Step 1: Build an electromagnetic compatibility test system and test platform in the laboratory, where the electromagnetic compatibility test system includes a measurement receiver, a signal generator, an oscilloscope, an antenna, and a LISN; Step 2: Mark the placement position of the electronic product to be tested on the test platform, and place an electromagnetic shielding chassis at the position; Step 3, open the upper cover of the electromagnetic shielding chassis, place the electronic product to be tested, the array filter board and the wires in the electromagnetic shielding chassis, and the array filter board is provided with multiple filters; Step 4: The signal line of the chassis socket of the electronic product under test is welded to one end of the corresponding filter on the array filter board through a wire with a pin, and the other end of the filter on the array filter board is also led out to the outside of the shielding chassis through a welding wire. The end of the wire is welded with a pin and connected to the test cable plug of the electronic product under test, and the upper cover of the electromagnetic shielding chassis is closed; Step 5: Plug the test cable of the electronic product under test into the power supply connected to the LISN to perform electromagnetic compatibility rectification; Step 6: The signal generator emits an interference signal, the antenna and the measuring receiver receive the signal of the electronic product under test, and the received signal is displayed through an oscilloscope; Step 7: Adjust and change the filtering state of the signal of the chassis socket of the tested electronic product through the display results of the oscilloscope to obtain different test effects, until the interference is effectively shielded or filtered out, the electromagnetic compatibility test of the tested electronic product is qualified, and the electromagnetic compatibility rectification of the electronic product is completed.

2. The method for rectifying the electromagnetic compatibility of electronic products according to claim 1, characterized in that: In step 7, the signal line of the chassis socket of the tested electronic product adjusts the filtering state by connecting different filters.

3. The method for rectifying the electromagnetic compatibility of electronic products according to claim 2, characterized in that: The electromagnetic shielding chassis is provided with a plurality of installation windows for installing array filter boards of various models, and the array filter boards are fixedly connected to the installation windows through conductive rubber plates.

4. The method for rectifying the electromagnetic compatibility of electronic products according to claim 2, characterized in that: The filter is a feed-through filter or a through-hole capacitor; the array filter plate is an aluminum alloy plate with a thickness of 1 to 2 mm.

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