摘要
"电感"和"电容"的模块(简称"LC单元")是组成EMI滤波器的核心元件,采用不同的连接方式可实现不同的参数集成。本文提出一种新型连接方式的LC单元,实现了共模电感、差模电感和差模电容的三参数集成。当通入共模(CM)电流时,由于上下线圈完全对称,对应线匝电位分布相同,则电容效应可忽略,LC单元可等效为两个平绕线圈;当通入差模(DM)电流时,单位电感的感应电动势相互抵消为零,电感效应消失,LC单元等效为一个电容。本文在分析其耦合方式的基础上,给出了差、共模电流作用下的等效电路,并采用错位过孔连接技术完成EMI滤波器的连接,最终将其运用于小功率电源PFC电路中,通过实验验证其有效性和优越性。
The model composed of ＇ induction＇ and ＇ capacitance＇ （ ＇ LC＇ unit） is an important component of EMI filter and it can integrate different parameters with different connection modes. In order to improve the characteristics of common mode filter, a new LC unit which realizes the integration of common mode inductor （LcM） , differential mode inductor （LoM） and differential mode capacitor （CDM） is presented in this paper. When the common mode current is entering, the capacitance effect can be ignored since the upper and lower coils are completely symmetrical, and finally the LC unit can be equivalent to two parallel coil ; when the differential mode current is entering, the effect of inductance can be ignored since the voltage distribution of the inductor is zero. Similarly, the LC unit can be equivalent to a capacitor. Based on the analysis of the coupling modes, the equivalent circuits are given in this paper. Meantime, the dislocation connection technology is adopted to complete the EMI filter. Finally, the LC unit which is connected by the new way will be used in the low power PFC supply. The effectiveness and the superiority of the new structure are verified by experiment.
出处
《电工电能新技术》
CSCD
北大核心
2015年第9期50-56,共7页
Advanced Technology of Electrical Engineering and Energy
基金
国家自然科学基金(51177071)
台达环境与教育基金会<电力电子科教发展计划>(DREK2013004)资助项目
关键词
LC单元
差模电流
共模电流
小功率PFC电路
LC unit
differential mode current
common mode current
low power PFC circuit
