基于差模电感集成的EMI滤波器分析与设计  

Analysis and design of EMl filter based on differential mode inductor magnetic integration

作　　者：何韶委 林苏斌[1] 陈为[1] 余兴旺 HE SHAOWEI;LIN SUBIN;YU XINGWANG;CHEN WEI(Colleage of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108)

机构地区：[1]福州大学电气工程与自动化学院,福州350108

出　　处：《磁性元件与电源》2024年第7期150-156,共7页Components and Power

基　　金：福建省自然科学基金(2022J01565).

摘　　要：传统上一般以共模抑流圈的漏感作为差模电感,但在差模噪声比较大的电路拓扑往往还需要一级单独的差模滤波器,这会造成磁件体积比较大。在优化了变压器后的共模噪声比较小情况下,可用差模电感来替换感值较大的共模抑流圈,再用小感值的共模抑流圈实现对共模噪声抑制效果相同。同时插入损耗能表征对噪声抑制效果,在此基础上提出的一种基于解耦差模滤波电感的磁集成结构的EMI滤波器,较原始方案能在保持对噪声抑制效果不变的前提下,EMI滤波器磁元件体积减小了40%,效果明显。本文以一台PFC+QR反激电源进行滤波器的插入损耗和整机的噪声的实验,最后通过初始和集成后的样机比较验证了这一方案可行性。Traditionally,the leakage inductance of the common--mode suppressor coil is used as the.differential mode inductance.However,in the circuit topology with high differential mode noise,a separate differential mode filter is often needed,which results in a large volume of magnetic parts.When the common--mode noise of the optimized transformer is relatively tiny,differential mode inductance can be used to replace the common-mode suppression coil with a large sense.The same effect of common mode noise suppress ion is achieved by using the common:-mode suppression coil with a small sense value.At the same time,.insertion loss can represent the effect of noise suppression.0n this basis,an EMI filter with integrated magnetic structure based on decoupled differential mode filter inductor is proposed.Compared with the original scheme,the volume of magnctic compononto in the EMI filtor ic roduood by 40%undor tho promico of kooping the same noise suppression effect,and the effect is obvious.In this paper,a PFC+QR flyback power supply is used to test the filter insertion loss and the noise of the whole machine.Finally,the feasibility of this scheme is verified by comparing the initial and integrated prototypes..

关 键 词：差模滤波器 磁集成 耦合系数 滤波器体积 

分 类 号：TN7[电子电信—电路与系统]