Analysis and Design Guide of Active EMI Filter in a Compact Package for Reduction of Common-Mode Conducted Emissions

Author

Dongil Shin ; Sungnam Kim ; Geunseok Jeong ; Jaesu Park ; Joungwook Park ; Ki Jin Han ; Jingook Kim

Author_Institution

Sch. of Electr. & Comput. Eng., Ulsan Nat. Inst. of Sci. & Technol., Ulsan, South Korea

Volume

57

Issue

4

fYear

2015

fDate

Aug. 2015

Firstpage

660

Lastpage

671

Abstract

A common-mode (CM) active filter was designed in a compact package to suppress CM conducted emissions at a switching mode power supply (SMPS). Based on the analytical expressions considering both stability and performance, the design and optimization rules for the proposed active filter have been presented. After verifying its performance by measurements using vector network analysis, the proposed filter was installed in a 200-W SMPS board with 64 and 110 kHz switching frequencies, demonstrating its usefulness by experiments. The performance degradation due to the magnetic saturation and the AEF grounding impedance was also analyzed and investigated.

Keywords

active filters; circuit stability; earthing; electromagnetic interference; interference filters; network synthesis; switched mode power supplies; AEF grounding impedance; CM conducted emission suppression; SMPS board; common-mode active filter design; frequency 64 kHz to 110 kHz; magnetic saturation; power 200 W; switching mode power supply stability; vector network analysis; Capacitors; Electromagnetic interference; Impedance; Inductors; Noise; Stability analysis; Switched-mode power supply; Active EMI filter (AEF); active filter; common mode (CM); conducted emission (CE); electromagnetic interference (EMI); feed forward; switching mode power supply (SMPS);

fLanguage

English

Journal_Title

Electromagnetic Compatibility, IEEE Transactions on

Publisher

ieee

ISSN

0018-9375

Type

jour

DOI

10.1109/TEMC.2015.2401001

Filename

7047781