Conducted EMI Evaluation and Reduction in a Forward Switching Converter

Subject Areas : Renewable energy

Mohammad Rouhollah  Yazdani ¹ (Assistant Professor/Khorasgan Branch, Islamic Azad University)
Nahid  Amini Filabadi ² (Isfahan Science and Technology Town)

Received: 2011-01-28 Accepted : 2012-01-28 Published : 2013-06-01

Keywords: Electromagnetic interference (EMI), Electromagnetic compatibility (EMC), Forward switching converter,

Abstract :

In switching power converters, electromagnetic interference (EMI) is produced due to the fast changes of the voltage and current. Among switching topologies used in low and medium powers, forward converter is vastly employed which needs resetting transformer core. In this paper, a forward converter with reset winding is modeled to predict conducted EMI. To evaluate the EMI model, EMI measurement results are presented. To select an optimum reset scheme from EMI viewpoint, three reset techniques are compared using experimental results. After selecting the proper reset scheme, two EMI mitigation methods are proposed and the practical EMI reduction is presented.