Research of active EMI suppression strategy for high power density power supply

With the requirement of high power density converters, the volume of the EMI filter needs to shrink as much as possible. To achieve this, the feasibility of active EMI filter without magnetic components applied in high current circumstance is studied. Firstly, a novel active EMI filter without magnetic components that suppresses the CM interference is proposed in this paper. Then, the parameter design process of the filter is presented. Finally, the filter prototype and EMI hardware testbed is built. The experimental results demonstrate the efficiency and stability of the proposed active filtering method.