开关电源EMI滤波器设计与验证

开关电源已广泛应用于电力电子设备中,作为一种EMI源,在设计电源电路中需前置EMI滤波器抑制传导干扰。CE102作为检测电源线传导干扰的一项电磁兼容性试验,成为电子设备尤其是军用电子设备的必测项目,测试超标即意味着设计的失败。设计了一个EMI滤波器,通过CE102测试和分析发现并解决设计存在的问题,并通过整改后的试验验证,证明设计的有效性。

Design and verification for EMI filter of switching power supply

Switching power supply, as a electromagnetic interference （EMI） source, is widely used in power electronic equipments. The EMI filter should be prepositioned in power circuit design to suppress the conducted EMI. CE102 is taken as a project of EMC tests to detect the conducted interference of power-line. It is a necessary measuring project of electronic equipments, especially for military electronic equipments. It means that the design of the power system fails if the interference exceeds the standard. An EMI filter was designed to find and solve the problems of the design by CE102 test and analysis. The effectiveness of the design was proved by CE102 after the test validation.