The Study of Countermeasure Components of Electromagnetic Interference

• Main Authors: Cheng-Zing Chou, 周政穎
• Other Authors: MING HSING LIN
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/65543036723082545480

碩士 === 大葉大學 === 電信工程學系碩士班 === 92 === In thesis, we investigated the transients occurred from electrostatic discharge (ESD), switching of machines, or the effects of lighting to electronic facilities. To make sure the electronic equipment can operate normally in the environment of high-frequency radiation coupled noise caused by transients, some appropriate protection components, such as chock, varistor, transient voltage suppressor, should be used. However, it is hard to forecast the effects of the protection components on the equipment under consideration without suitable circuit models. We have aimed at the equivalent circuits of common-mode chocks and varistor to analyze the characteristic of suppressing high-frequency noise and transient noise. Besides, to produce the transients which can be used in immunity tests, such as IEC 61000-4-2, IEC 61000-4-4, and IEC 61000-4-5, we also designed a pulse waveform generator. This generator, essentially an energy storage element, can produce pulse with very fast rise time and very high maximum voltage so as to be used as transient generator. Two protection components, chock and varistor, were studied to see how they can make the electronic equipment pass EMI tests.