开关电源EMI滤波器设计与验证

摘要

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 equip-ments,especially for military electronic equipments. It means that the design of the power system fails if the interference ex-ceeds the standard. An EMI filter was designed to find and solve the problems of the design by CE102 test and analysis. The ef-fectiveness of the design was proved by CE102 after the test validation.%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。