A Novel Design Method for Hybrid Common-Mode EMI Filters Based on Attenuation Adjustability

The hybrid common-mode (CM) electromagnetic interference (EMI) filter (HEF) consists of active EMI filter (AEF) and passive EMI filter (PEF). The PEF has higher attenuation at high-frequency band and the AEF is better at suppressing CM EMI at lower band, so they are complementary to each other. Howe...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2025-02, Vol.40 (2), p.3138-3149
Main Authors: Chen, Qichi, Zhou, Peng, Pei, Xuejun, Yu, Yi, Kang, Yong
Format: Article
Language:English
Subjects:
Attenuation
Attenuation adjustability
common-mode (CM)
Design methodology
Electromagnetic interference
electromagnetic interference (EMI)
Filters
hybrid EMI filter (HEF)
Impedance
Inductors
Insertion loss
Inverters
Noise
unnecessary margin
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Summary:The hybrid common-mode (CM) electromagnetic interference (EMI) filter (HEF) consists of active EMI filter (AEF) and passive EMI filter (PEF). The PEF has higher attenuation at high-frequency band and the AEF is better at suppressing CM EMI at lower band, so they are complementary to each other. However, traditional HEF is designed to satisfy the largest required attenuation and it ignores that CM EMI has multiple resonance peaks in frequency domain, so it leaves unnecessary margins in some frequency bands and leads to an undesired overdesign. To address the shortcoming, this article investigates the attenuation adjustability and puts forward a novel design method for the HEF. First, traditional HEF design is introduced, whose limitation is that unnecessary margins and undesired overdesign are caused. Then, the attenuation adjustability is analyzed and it allows the attenuation to change flexibly due to AEF's high degree of freedom. On this basis, the HEF design method is proposed. It can fit the required attenuation instead of only aiming at the largest attenuation, and the undesired overdesign can be avoided. The method is verified experimentally in a SiC-based H-bridge inverter, which shows that the inductance of the CM choke is reduced by 73%.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2024.3479318