电工技术学报2016，Vol.31Issue(18)：66-74,9.
基于散射参数法的EMI滤波器电磁噪声抑制效果预测
Predicting the Suppression Effect of EMI Filter Based on the S-Parameter Method
摘要
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.关键词
EMI滤波器/差模噪声/共模噪声/阻抗不匹配/S参数Key words
EMI filter/differential noise/common noise/impedance mismatching/S-parameters分类
信息技术与安全科学引用本文复制引用
王世山,龚敏,宋峥..基于散射参数法的EMI滤波器电磁噪声抑制效果预测[J].电工技术学报,2016,31(18):66-74,9.基金项目
国家自然科学基金（51177071），台达环境与教育基金会《电力电子科教发展计划》（DREK2013004），江苏高校优势学科建设工程项目，南京航空航天大学研究生创新基地（实验室）开放基金（kfjj201412）和中央高校基本科研业务费专项资金资助项目。 （）
