A Review of Filters for Conducted Electromagnetic Interference Suppression in Converters

With the evolution of semiconductor devices, power electronics systems are trending towards higher frequencies and greater integration, leading to increasingly severe electromagnetic interference (EMI) issues. As an effective means of suppressing EMI, EMI filters have been extensively researched consequently. Over the past few decades, research on EMI filters has yielded a wealth of valuable achievements. However, the existing literature lacks a comprehensive and systematic collation of different EMI filters. In order to fill this gap, this work presents a thorough survey of EMI filters. According to their principles and implementation methods, these EMI filters can be broadly categorized into three types: Passive EMI Filters (PEFs), Active EMI Filters (AEFs) and integrated electromagnetic EMI filters (IEFs). Based on the review of the principles for each category, this paper analyzes their respective advantages, drawbacks, and development status. Through organization and categorization, this work aims to provide a reference for researchers and designers.