Characterization and Circuit Modeling of Electromagnetic Interference Filtering Chokes in Power Electronics: A Review

With the evolution of Industry 4.0 and the surge in demand for sustainable energy, power electronics are becoming essential in various applications. Considering the reliability and safety of power electronics devices, studying and addressing the conducted electromagnetic interference (EMI) issues are of paramount importance. Due to the merits of versatility, flexibility, and effectiveness, passive filters containing EMI filtering chokes and capacitors are commonly used. Among them, EMI filtering chokes have been widely investigated in recent years because they account for most of the weight and size of a passive filter and mitigate considerable EMI noises. To the best of our knowledge, this article presents the first review of EMI filtering chokes used in power electronics that specifically focuses on their characterization and circuit modeling. These topics help to evaluate choke performance, optimize choke configuration, and facilitate systematic simulation, ultimately refining filtering design. Starting with an overview, the type, structure, principles, information, and modes of chokes are demonstrated. For choke characterization, various analytical, numerical, and measurement methods are compared. Using the characterized information, their distributed, lumped, and multistage circuit models along with the relevant parameterization process are summarized. Finally, existing challenges, ongoing innovations, and future topics are explored.