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Measurement and Suppression of Common-mode and Differential-mode EMI in PWM Converter System

Xue Wen-yan

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Abstract

This paper discusses how to reduce conducted electromagnetic interference (EMI) in an AC/DC converter system to accord with EN class A. Herein some passive methods of suppressing conducted EMI noise, such as mixed-mode (MM) EMI filters, snubbing circuits, are used. Based on measurement, the sources of noise are detected with characteristics analyzed in detail. The MM EMI filter is valuable means with which the conducted EMI noise can be effectively reduced. A simple method of designing EMI filter, combining theoretical calculation with practical modification, is presented. It is easily implemented with only the amplitude of noise and sink impedances required. The experiment results prove that the methods adopted are viable and effective.

About this research paper

What this paper is about

This paper discusses how to reduce conducted electromagnetic interference (EMI) in an AC/DC converter system to accord with EN class A. Herein some passive methods of suppressing conducted EMI noise, such as mixed-mode (MM) EMI filters, snubbing circuits, are used. Based on measurement, the sources of noise are detected with characteristics analyzed in detail. The MM EMI filter is valuable means with which the conducted EMI noise can be effectively reduced. A simple method of designing EMI filter, combining theoretical calculation with practical modification, is presented. It is easily implemented with only the amplitude of noise and sink impedances required. The experiment results prove that the methods adopted are viable and effective.

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Available abstract

This paper discusses how to reduce conducted electromagnetic interference (EMI) in an AC/DC converter system to accord with EN class A. Herein some passive methods of suppressing conducted EMI noise, such as mixed-mode (MM) EMI filters, snubbing circuits, are used. Based on measurement, the sources of noise are detected with characteristics analyzed in detail. The MM EMI filter is valuable means with which the conducted EMI noise can be effectively reduced. A simple method of designing EMI filter, combining theoretical calculation with practical modification, is presented. It is easily implemented with only the amplitude of noise and sink impedances required. The experiment results prove that the methods adopted are viable and effective.

Key concepts: EMI, Electromagnetic interference, Conducted electromagnetic interference, Common-mode signal, Electronic engineering, Noise (video), Filter (signal processing), Electromagnetic compatibility

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Measurement and Suppression of Common-mode and Differential-mode EMI in PWM Converter System — Research Paper | ScholarLens