基于散射参数法的EMI滤波器电磁噪声抑制效果预测

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Abstract Electromagnetic interference (EMI) filter is an important component to suppress the conducted EMI noise, especially the EMI filter with high performance. Based on the transmission line theory, the common mode (CM) parameters and differential mode (DM) parameters of parallel transmission lines are obtained, and the source and load impedances are received through calculation and test. Furthermore, the insertion loss (IL) can be calculated by the impedance method. However, in the high frequency, the parameters of EMI filter and transmission line involve not only the self-parasitic parameters but also the mutual parasitic parameters. These mutual parasitic parameters are very difficult to calculate or be equivalent by the impedance method. Therefore, the parameters of CM and DM filters with transmission line are explored. Then, according to the transmission line theory, the noise source and load impedance are calculated. Taken CM filter as an example, the attenuation of noise is predicted by the impedance method, and is compared with the actual test value. However, the prediction on attenuation of noise is inaccurate at high frequency. Thus, this paper further presents a method (S parameter) to predict the attenuation accurately under the conditions of impedance mismatch, where the key of this method is the incident and reflected waves. It is shown that due to the consideration of the interaction among the parasitic elements, the S-parameter method has better high-frequency performance.

Key words： EMI filter differential noise common noise impedance mismatching S-parameters

Received: 25 July 2015 Published: 13 October 2016

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TM93

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	Articles by authors
	Wang Shishan
	Gong Min
	Song Zheng

Cite this article:

Wang Shishan,Gong Min,Song Zheng. Predicting the Suppression Effect of EMI Filter Based on the S-Parameter Method[J]. Transactions of China Electrotechnical Society, 2016, 31(18): 66-74.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I18/66

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