Integrated hybrid EMI filter: Study and realization of the active part

Based on the EMI converter model, a hybrid EMI filter is proposed. The chosen active filtering circuit is integrated on the PCB using the passive integrated part. Theoretical and realization results show the integration compatibility between the active part and the passive part. Then EMI measurements show that the proposed integrated hybrid filter can greatly reduce the noise at high and low frequencies while reducing the overall bulkiness.

Introduction

Switching mode power conversion systems leads to a high conducted and radiated electromagnetic disturbances on a wide frequency band [1], [2]. These emissions may bring malfunction to other electronic equipment used in sensitive applications. To protect the network and meet standards for electromagnetic interference (EMI) including the aeronautic standard “DO160F [150 KHz, 30 MHz]”, an EMI filter is absolutely necessary.