开关电源EMI滤波器的设计

Designing EMI Filter and Simulation

文章首先分析了开关电源电磁干扰问题产生的原因及种类,建立开关电源EMI滤波器的共模和差模等效模型以分析噪声的传播方式,结合滤波器所需对应的开关电源工作频率为基础来设计滤波器,无需复杂的计算,对不同工作频率的开关电源有较强的针对性。最后通过实例验证了此设计方法的可行性。

In this paper first of all the category and causes of the switching mode power supp ly EMI are analyzed.Second build the equivalent models for common mode and di fferential mode of switching power supply EMI fi lter,this procedure is based on the analysis of noise and the frequency of SMPS.This procedure needs no complex computing and fits SMPS with certain frequency well.Lastly,the feasibility of this design method is verified by simulation.