重叠交错共模绕组布局的高性能小型化EMI滤波器.docVIP

 重叠交错共模绕组布局的高性能小型化 EMI 滤波器# 邓良勇，黄惠芬** 5 10 15 20 25 30 35 （华南理工大学电子与信息学院，广州 510641） 摘要：本文利用两共模电感绕组的层间重叠交错布局集成共模 EMI 滤波器，有效地减小了 绕组的寄生并联电容，仅为参考文献 EMI 滤波器 EPC 的 14%，提高了共模滤波器的高频性 能；两共模电感绕组形成的层间电容充当差模电容，因而重叠交错共模绕组布局集成了共模 电感，共模电容，差模电容，进而小型化滤波器尺寸。同时利用柔性铜箔作为滤波器的差模 电感，能方便控制差模电感。将上述两种结构组合在同一磁芯设计 EMI 滤波器高频性能好， 且因无需另外加入漏感磁芯，所以具有较小的体积，本设计没有增加滤波器复杂度及成本。 实验与仿真结果证明本文设计的 EMI 滤波器改善高频性能的有效性。 关键词：EMI 滤波器；重叠交错绕组；寄生并联电容；柔性铜箔；差模电感 中图分类号：TN713 A Compact EMI filter with good high Frequency chacrateristics based on the interleaved and overlapped wingding DENG Liangyong1, HUANG Huifen2 (1. School of Electronic and Information Engineering, South China University of Technology, Guangzhou, 510641; 2. School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641) Abstract: The overlapped and interleaved arrangement of two common mode (CM) L-C windings is used to integrated the CM EMI filter, and the EPC is effectively decreased to about 14% of the original EMI filter so that the filter high-frequency performance is improved. The differential mode (DM) capacitors is completed by the capacitances between two overlapped and interleaved windings .Therefore, CM inductors, CM capacitors and DM capacitors can be integrated in the integrated overlapped and interleaved L-C winding mode, and it realizes the filter Miniaturization. In addition, flexible foils are rolled around E core side legs to enhance differential mode (DM) inductance. And the turn numbers of Flexible foils make the design of DM inductance more controlable and flexible. the integrated EMI filter combined interleaved planar PCB windings and flexible foils in a same ferrite core has not only good high frequency characteristics , but also compact profile. Under the same manufacturing complexity and cost, the effectiveness of these technologies has been comfirmed by experiments. Key words: EMI filter, overlapped and interleaved windings, parasitic parallel capacitance, flexible foils, DM indu