The primary measure to suppress electromagnetic pollution is to find the source of pollution; the second is to judge the path of pollution intrusion, mainly in both conduction and radiation, the focus of work is to determine the amount of interference. Solving the problem of electromagnetic compatibility should start from the development stage of the product and run through the entire product or system development and production process. A large number of experiences at home and abroad have shown that the earlier attention to solving electromagnetic compatibility problems in the development and production of products or systems, the more manpower and material resources can be saved.
The key technology of electromagnetic compatibility design is the study of electromagnetic interference sources. Controlling electromagnetic emissions from electromagnetic interference sources is the cure method. Controlling the emission of an interference source, in addition to reducing the level of electromagnetic noise generated by the mechanism generated by the electromagnetic interference source, requires extensive application of shielding (including isolation), filtering, and grounding techniques.
The shielding mainly uses various conductive materials, is manufactured into various shells and is connected with the earth to cut off the electromagnetic noise propagation path formed by the electrostatic coupling, inductive coupling or alternating electromagnetic field coupling of the space. The isolation mainly uses relays, isolation transformers or photoelectrics. Devices such as isolators cut off electromagnetic noise in a conductive form of propagation, which is characterized by separating the grounding systems of the two parts of the circuit and cutting off the possibility of coupling through the impedance.
Filtering is a technique for processing electromagnetic noise in the frequency domain, providing a low-impedance path for electromagnetic noise to achieve the purpose of suppressing electromagnetic interference. For example, the power supply filter exhibits a high impedance to the 50 Hz power supply frequency and a low impedance to the electromagnetic noise spectrum.
Grounding includes grounding, signal grounding, and so on. The design of the grounding body, the arrangement of the ground wire, and the impedance of the grounding wire at various frequencies are not only related to the electrical safety of the product or system, but also related to electromagnetic compatibility and its measurement technology.
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