EV充电器中DC/DC变换器共模EMI研究与抑制  

Research and suppression of DC/DC converter common mode EMI in EV charger

作　　者：李昕 苏利捷[1] 黄保栋 Li Xin;Su Lijie;Huang Baodong(School of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730000,China;State Grid Tibet Electric Power Company Limited,Tibet 850000,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730000 [2]国网西藏电力有限公司,拉萨850000

出　　处：《电测与仪表》2020年第6期132-139,共8页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51767015,51767013);甘肃省自然科学基金资助项目(1610RJZA051)。

摘　　要：直流/直流(DC/DC)变换器是电动汽车(EV)充电器的重要组成器件,同时也是影响电动汽车充电器电磁环境的主要干扰源之一。针对充电器中DC/DC变换器产生的共模电磁干扰(EMI),基于电磁干扰源和干扰传播路径,提出一种带钳位二极管的电压互补性移相ZVS-DC/DC全桥变换器对变换器产生的共模电磁干扰进行抑制。首先对充电器中降压型DC/DC全桥变换器的工作原理和其中主要的EMI干扰源进行分析,其次对DC/DC变换器共模电磁干扰传播路径进行建模和理论推导,最后在Matlab软件上对产生的共模电磁干扰进行仿真分析。文中搭建了采取抑制方法后的变换器电路,并通过仿真验证该方法的可行性。对结果进行分析,该方法能有效的降低DC/DC变换器的共模电磁干扰,使电动汽车充电器的电磁兼容性得到了提高。Direct current/Direct current(DC/DC)converter is an important component of electric vehicle(EV)charger,and also one of the main interference sources affecting the electromagnetic environment of electric vehicle charger.For the common mode electromagnetic interference(EMI)generated by DC/DC converter in charger,a voltage complementary phase-shifting ZVS-DC/DC full-bridge converter with clamp diode is designed to suppress the common mode electromagnetic interference generated by the converter,considering the electromagnetic interference source and propagation path.Firstly,the working principle of DC/DC full-bridge converter and its main EMI interference source are analyzed.Secondly,the path of common mode EMI propagation of DC/DC converter is modeled and deduced theoretically.Finally,the common mode EMI generated on Matlab is simulated and analyzed.In this paper,the converter circuit after the suppression method is established,and the feasibility of the proposed method is verified by simulation.The results show that this method can effectively reduce the common mode EMI of DC/DC converter and improve the electromagnetic compatibility of electric vehicle charger.

关 键 词：电动汽车充电器 DC/DC变换器 共模电磁干扰 电磁兼容 

分 类 号：TM712[电气工程—电力系统及自动化]