Basic knowledge of power supply filtering Introduction to basic knowledge of EMI power supply filter [pic] | ||Electromagnetic interference: ||Electromagnetic interference is the degradation of equipment, devices or system performance caused by electromagnetic disturbance. ||With the rapid development of electronic technology, electronic equipment has been widely used, and electromagnetic environment pollution has become increasingly serious. It has become one of the main public hazards today and has attracted more and more attention from all walks of life in countries around the world. In many fields, electromagnetic compatibility has become a necessary technical indicator or performance evaluation basis for electrical and electronic products, and even relates to the survival of an enterprise or a product. ||EMI power supply filter: ||Electromagnetic interference (EMI) power supply filter (hereinafter referred to as filter) is a passive bidirectional multi-port network composed of inductors, capacitors, etc. In fact, it plays the role of two low-pass filters, one attenuating common mode interference and the other attenuating differential mode interference. It can attenuate radio frequency energy within the stop band (usually greater than 10KHz) and let the power frequency pass without or with little attenuation. EMI power supply filter is the preferred tool for electronic equipment design engineers to control conducted electromagnetic interference and radiated electromagnetic interference. Insertion loss: The insertion loss of a filter is the ratio of the noise voltage transmitted from the noise source to the load when the filter is not used to the noise voltage on the load when the filter is inserted. The insertion loss is tested under no-load, 50Ω system conditions, and the results are usually expressed as an attenuation curve (in decibels) in the frequency band of interest. The calculation of the insertion loss can be obtained by the following formula: [pic] ……
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