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.
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.
Wang Shishan, Gong Min, Song Zheng. Predicting the Suppression Effect of EMI Filter Based on the S-Parameter Method. Transactions of China Electrotechnical Society, 2016, 31(18): 66-74.
[1] 钱照明, 程肇基. 电力电子系统电磁兼容设计基础及干扰抑制技术[M]. 杭州: 浙江大学出版社, 2000. [2] Fang Luo, Dong Dong, Dushan Boroyevich, et al. Improving high frequency performance of an input common mode EMI filter using an impedance mismatching filter[J]. IEEE Transactions on Power Electronics, 2014, 29(10): 5111-5115. [3] 金亮亮, 周荔丹, 姚钢, 等. 适用于并网逆变器的新型LCL滤波器[J]. 电力系统保护与控制, 2016, 44(11): 1-8. Jin Liangliang, Zhou Lidan, Yao Gang, et al. A novel LCL filter adopted in grid-connected inverter[J]. Power System Protection and Control, 2016, 44(11): 1-8. [4] Sheng Ye. New EMI filter design methods for DC-DC and AC-DC switching power supplies[D]. Kingston: Queen’s University, 2003. [5] 马伟明. 独立电力系统及其电力电子装置的电磁兼容[M]. 武汉: 武汉水利电力大学出版社, 2000. [6] 陈恒林, 陈玮, 冯利民, 等. 通过改变噪声源阻抗抑制高频共模噪声[J]. 电力电子技术, 2006, 40(6): 124-125. Chen Henglin, Chen Wei, Feng Limin, et al. High frequency common mode EMI noise suppression for switching converters by impedance control[J]. Power Electronics, 2006, 40(6): 124-125. [7] Wang Shuo, Fred C Lee, Willem Gerhardus Odendaa. Characterization and parasitic extraction of EMI filters using scattering parameters[J]. IEEE Transa- ctions on Power Electronics, 2005, 20(2): 502-510. [8] Bo Hu, Kye Yak See, Weng Yew Chang Richard. Evaluation of ferrite core EMI suppression under realistic working conditions[C]//2008 Asia-Pacific Sympsoium on Electromagnetic Compatibility, Singapore, 2008: 774-777. [9] 陈恒林. EMI滤波器高频建模一寄生效应研究[D]. 杭州: 浙江大学, 2007. [10] Huang Huifen, Deng Liangyong, Hu Binjie, et al. Techniques for improving the high-frequency performance of the planar CM EMI filter[J]. IEEE Transactions on Electromagetic Compatibility, 2013, 55(5): 901-908. [11] Fang Luo, Dushan Boroyevich, Paolo Mattavelli. Improving EMI filter design with in circuit impedance mismatching[C]//Twenty-Seventh Annual IEEE, Applied Power Electronics Conference and Exposition (APEC), Orlando, FL, 2012: 1652-1658. [12] 石磊磊, 王世山, 徐晨琛. 二端口网络散射参数理论及其在平面EMI滤波器测试中的应用[J]. 电工技术学报, 2013, 28(2):78-85. Shi Leilei, Wang Shishan, Xu Chenchen. Theory of scatter parameters of two port network and its application in the test of planar EMI filter[J]. Transactions of China Electrotechnical Society, 2013, 28(2): 78-85. [13] 张佳佳, 张逸成, 韦莉, 等. 基于插入损耗的噪声源阻抗修正计算方法[J]. 电工技术学报, 2015, 30(4): 80-87.
2016, Vol. 31 
