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重叠交错共模绕组布局的高性能小型化EMI滤波器

发表时间:2012-11-30  浏览量:1014  下载量:503
全部作者: 邓良勇,黄惠芬
作者单位: 华南理工大学电子与信息学院
摘 要: 利用两共模电感绕组的层间重叠交错布局集成共模电磁干扰(electro-magnetic interference,EMI)滤波器,有效地减小了绕组的寄生并联电容,仅为等效并联电容(equivalent parallel capacitance, 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,进而缩小了滤波器的尺寸。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2种结构组合在同一磁芯设计EMI滤波器上,其高频性能好,且因无需另外加入漏感磁芯,有较小的体积。实验与仿真结果证明:设计的EMI滤波器改善了高频性能的有效性。
关 键 词: 电子技术;电磁干扰滤波器;重叠交错绕组;寄生并联电容;柔性铜箔;差模电感
Title: A compact EMI filter with good high frequency characteristics based on the overlapped and interleaved winding
Author: DENG Liangyong, HUANG Huifen
Organization: School of Electronic and Information Engineering, South China University of Technology
Abstract: The overlapped and interleaved arrangement of two common mode (CM) L-C windings is used to integrate the CM electro-magnetic interference (EMI) filter, and the equivalent parallel capacitance (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 are 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 DM inductance. And the turn numbers of flexible foils make the design of DM inductance more controllable and flexible. The integrated EMI filter combined interleaved planar PCB windings and flexible foils in the 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 confirmed by experiments.
Key words: electronic technology; electro-magnetic interference filter; overlapped and interleaved windings; parasitic parallel capacitance; flexible foils; differential mode inductance
发表期数: 2012年11月第22期
引用格式: 邓良勇,黄惠芬. 重叠交错共模绕组布局的高性能小型化EMI滤波器[J]. 中国科技论文在线精品论文,2012,5(22):2205-2212.
 
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