基于共模扼流圈高频模型的Boost PFC的EMI滤波器设计  

EMI filter for boost PFC converters based on high-frequency model of common-mode chokes

作　　者：陈浩[1] 胡耀威[1] 王磊[1] 陈冬冬[1] 陈国柱[1] CHENHao;HU Yao-wei;WANGLei;CHEN Dong-dong;CHENGuo-zhu(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《机电工程》2018年第8期868-872,879,共6页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(51777186)

摘　　要：针对Boost PFC变换器存在的传导电磁干扰问题,对Boost PFC变换器在加入平衡电容前后的共模、差模干扰传导路径进行了分析,进而对混合传导电磁干扰的成因及抑制方法进行了研究。对共模扼流圈的非理想因素及现有高频模型的局限性进行了归纳,综合考虑了磁芯材料频率特性及绕组寄生电容的影响,建立了一种改进的Foster网络串联模型,并提出了一种基于共模扼流圈阻抗特性优化的EMI滤波器设计方案,利用一套1.25 k W的Boost PFC变换器样机进行了对比实验验证。研究结果表明:将所设计的EMI滤波器加入电路后,待测装置能顺利通过传导干扰测试。Aiming at the problem of conducted electromagnetic interference in Boost PFC converters,through the analysis of its commonmode and differential-mode interference conduction paths in Boost PFC converters with or without the balanced capacitor,the causes and suppression methods of mixed-mode conducted electromagnetic interference in Boost PFC converters were studied. Considering the frequency characteristics of the core material and winding parasitic capacitors,the non-ideal factors of common-mode chokes and the limitations of the existing high-frequency model were summarized. An improved Foster network series model was established and an EMI filter design scheme based on optimization of high-frequency impedance characteristics. Experiments were carried out using a prototype of 1. 25 k W Boost PFC converter. The results indicate that after the designed EMI filter was added to the circuit,the device under test can pass the conducted interference test successfully.

关 键 词：传导电磁干扰 平衡电容 高频模型 EMI滤波器 

分 类 号：TM477[电气工程—电器] TP461[自动化与计算机技术]