基于一种有源EMI共模技术的研究

为了探讨共模电流辐射,找到抑制电子系统（产品）设计中共模电流电磁辐射原因;本研究从阐明共模电流的含义出发,采用一种开关电源的有源EMI共模滤波器方案,用以一个AC/DC半桥变换器半桥电路来实现这种方案,对整机做了EMI传导性能、电磁辐射测试。分析与仿真实验结果也验证了有源滤波器的使用对开关电源的共模传导干扰抑制的有效性。该研究对电子产品的开发、抑制电子系统（产品）设计中共模电流电磁辐射有一定的借鉴作用。

Based on an active common mode EMI technology

In order to explore the common-mode current radiation,to curb the electronic system（product）design the CPC mode current electromagnetic radiation;In this study,to clarify the meaning of common-mode currents,used a active common mode EMI filter program with switching power supply,which an AC/DC half-bridge converter half-bridge circuits to implement such a program,the machine had done a conductive properties of EMI,electromagnetic radiation testing.Analysis and simulation results validate the use of active filter switching power supply common mode conduction noise suppression effectiveness.The study of electronic product development,inhibit electronic system（product）design the CPC mode current of electromagnetic radiation have some for reference.