圆环线匝构成的平面共模emi滤波器的特性研究-电工技术学报.pdf

20 11 年 11 月 电 工 技 术 学 报 Vol.26 No. 11 第 26 卷第 11 期 TRAN SACTION S OF CHINA ELECTROTECHNICAL SOCIETY Nov . 20 11 圆环线匝构成的平面共模 EMI 滤波器的特性 研究 王世山 朱叶 周小林 武丽芳 （南京航空航天大学自动化学院 南京 2 100 16） 摘要 平面LC 线圈是组成平面EMI 滤波器的 本单元，其匝间寄生电容及所用磁心磁导 率的非线性对滤波器的高频性能有重要影响。本文首次提出环形平面LC 线圈结构，并对矩形 和环形平面LC 线圈进行了3D 有限元仿真，通过对比其特性确定了环形LC 线圈作为组成 EMI 滤波器的 本组成单元，并 于该结构实现了平面共模EMI 滤波器。考虑了匝间寄生电容、 相邻导体间的互感及有效磁导率的非线性，建立了环形LC 线圈的等效集中参数电路，利用节 点电压法求解了当其连接成低通滤波器时的插入损耗。 于环形平面LC 线圈设计了一台平面 共模滤波器样机，计算与实验对比 示，匝间寄生电容和磁导率的非线性对滤波器的高频性能 有重要影响。 关键词：平面LC 线圈 插入损耗 节点电压法 中图分类号：TM7 13 Characteristics Research for Planar Common Mode EMI Filter Based on Toroidal LC Coil Wang Shishan Zhu Ye Zhou X iaolin Wu L if ang （Nanj ing University of Aeronautics and Astronautics Nanj ing 2 100 16 China ） Abstract Planar LC coil is the basic unit constituted planar EMI filter, of which stray capacitance and non-linear permeability of magnetic core have important impact on high-frequency performances of filter . A novel passive integrated structure, the toroidal planar LC coil, is presented firstly, and the 3D finite element simulation of the rectangle and toroidal planar LC coil is done. By comparing the characteristics between them, the toroidal planar LC coil is used as the basic unit, and planar common mode(CM) filter is achieved based on this structure. Distributed parameters such a stray capacitance, magnetic coupling between conductors and non-linear characteristics of the magnetic core are all considered, and then the equivalent lumped parameter circuit is built . The insertion loss is achieved thro