Abstract：Noise measurement plays an important role in the design of EMI filter. Due to the imbalance behavior of noise current flowing through a LISN, the mix-mode (MM) noise is generated. The generation mechanism of the MM noise is similar to the common mode (CM) noise, but it is suppressed by using differential mode (DM) capacitor. Based on the study of MM noise, the differences between the MM noise and the conventional noise (including conventional DM noise and CM noise) are explored. The suppression mechanism of MM noise is explored. The function of DM part is attributed into two distinct parts: impedance mismatch for conventional DM noise and noise current balancing for MM noise. The bus-bar EMI filter and the planar EMI filter, representative EMI filters of integrated EMI filters, are analyzed. Based on the analyses, the effects of MM noise emission on the design of bus-bar EMI filter and planar EMI filter are explored. The effects on the selection of material and the production of integrated EMI filter are elaborated. The newly designed examples considering MM noise are presented and experiments are carried out to verify the analysis. The effectiveness of the newly designed EMI filters on the suppressing of noise and the accuracy design of the parameter of EMI filters are shown from the conducted experiments.
[1] Paul C R, 闻映红(译). 电磁兼容导论[M]. 北京: 机械工业出版社, 2006. [2] Ye Sheng, Eberle W, Liu Yanfei. A novel EMI filter design method for switching power supplies[J]. IEEE Transactions on Power Electronics, 2004, 19(6): 1668-1678. [3] Meng Jin, Ma Weiming. A new technique for modeling and analysis of mixed-mode conducted EMI noise[J]. IEEE Annual on Power Electronics Specialists Conference, 2004, 2: 1034-1040. [4] Qu Song, Chen D Y. Mixed-mode EMI noise and its implications to filter design in offline switching power supplies[J]. IEEE on Applied Power Electro- nics Conference and Exposition, 2000, 2: 707-713. [5] Hsieh H I, Li J S, Chen D. Effects of X capacitors on EMI filter effectiveness[J]. IEEE Transactions on Industrial Electronics, 2008, 55(2): 949-955. [6] Hsieh H I, Dan Chen, Qu Song. A filter design procedure incorporating mixed-mode EMI noise for off-line switching power supplies[C]. The 4th Inter- national Power Electronics and Motion Control Conference, Xi’an, China, 2004: 1527-1532. [7] Wang Shishan, Xu Chenchen. Design theory and implementation of a planar EMI filter based on annular integrated inductor-capacitor unit[J]. IEEE Transactions on Power Electronics, 2013, 28(3): 1167- 1176. [8] 罗昉. 三相电机驱动系统中电磁干扰及其高功率密度滤波方案研究[D]. 武汉: 华中科技大学, 2010. [9] Baisden A C, Boroyevich D, Van Wyk J D. High frequency modeling of a converter with an RF-EMI filter[C]. IEEE 41th Industry Applications Conference (IAS), Tampa, USA, 2006, 5: 2290-2295. [10] 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. [11] Luo Fang, Baisden A C, Boroyevich D, et al. Design of a hybrid busbar filter combining transmission-line filter and one turn inductor for DC-fed three phase motor drive systems[J]. IEEE Transactions on Power Electronics, 2013, 28(12): 5588-5602. [12] 温志伟, 伍晓峰, 徐德鸿, 等. 集成EMI滤波器原理与设计[J]. 电工技术学报, 2011, 26(9): 160-166. Wen Zhiwei, Wu Xiaofeng, Xu Dehong, et al. Principles and design on integrated EMI filters[J]. Transactions of China Electrotechnical Society, 2011, 26(9): 160-166. [13] 杨玉岗, 冯本成, 王长华, 等. 一种新型的平面无源集成EMI滤波器结构[J]. 电工技术学报, 2012, 27(8): 108-113. Yang Yugang, Feng Bencheng, Wang Changhua, et al. A novel structure of planar passive integrated EMI filter[J]. Transactions of China Electrotechnical Society, 2012, 27(8): 108-113. [14] 王世山, 朱叶, 周小林, 等. 圆环线匝构成的平面共模EMI滤波器的特性研究[J]. 电工技术学报, 2011, 26(11): 68-73. Wang Shishan, Zhu Ye, Zhou Xiaolin, et al. Characteristics research for planar common mode EMI filter based on toroidal LC coil[J]. Transactions of China Electrotechnical Society, 2011, 26(11): 68-73. [15] 张杰, 罗隆福, Aggarwal R K, 等. 基于多线圈耦合的新型换流变压器仿真模型设计[J]. 电工技术学报, 2010, 25(11): 68-79. Zhang Jie, Luo Longfu, Aggarwal R K, et al. Simulation model’s design of a new converter transformer based on multi-coil coupling[J]. Trans- actions of China Electrotechnical Society, 2010, 25(11): 68-79. [16] 王世山, 朱叶, 沈湛. 构成平面EMI滤波器元件电磁参数的提取[J]. 中国电机工程学报, 2012, 32(21): 146-152. Wang Shishan, Zhu Ye, Shen Zhan. Extraction of magnetic parameters for planar EMI filter elements[J]. Proceedings of the CSEE, 2012, 32(21): 146-152.
2015, Vol. 30 
