Conducted EMI Evaluation and Reduction in a Forward Switching Converter

• Main Authors: Mohammad Rouhollah Yazdani, Nahid Amini Filabadi
• Format: Article
• Language: English
• Published: Najafabad Branch, Islamic Azad University 2012-04-01
• Series: Journal of Intelligent Procedures in Electrical Technology
• Subjects: Electromagnetic interference (EMI); Electromagnetic compatibility (EMC); Forward switching converter
• Online Access: http://jipet.iaun.ac.ir/pdf_4401_59051032f5f066340bb5763b49761d0a.html

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.