Journal
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Volume 57, Issue 4, Pages 660-671Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEMC.2015.2401001
Keywords
Active EMI filter (AEF); active filter; common mode (CM); conducted emission (CE); electromagnetic interference (EMI); feed forward; switching mode power supply (SMPS)
Funding
- Basic Science Research Program through the National Research Foundation of Korea - Ministry of Education [2013R1A1A2058045]
- National Research Foundation of Korea [2013R1A1A2058045] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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