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2012-08-22
Parasitic Capacitance Cancellation of Integrated EMI Filter Using Split Ground Structure
By
Hui-Fen Huang,

    Prof. Hui-Fen Huang

    School of Electronic and Information Engineering

    South China University of Technology

    China

    Homepage

Mao Ye

    Mr. Mao Ye

    School of Electronic and Information Engineering

    South China University of Technology

    China

    Homepage

Progress In Electromagnetics Research B, Vol. 43, 91-107, 2012
doi:10.2528/PIERB12062107 | Google Scholar

Abstract
A convenient method for canceling the parasitic winding capacitance of integrated electromagnetic interference (EMI) filter is proposed. Based on the concept of split ground structure, mutual inductances and structural capacitances can be appropriately utilized to expand the effective frequency range in common mode (CM) noise suppression. Compared with the former approaches, it requires no additional conductor layers or components since the split winding can simultaneously serve for CM capacitance. To demonstrate the parasitic capacitance cancellation mechanism, a simplified equivalent circuit is derived and investigated. Besides, the design procedure with considered structural constraints is presented to obtain the best parasitic capacitance cancellation effect. Prototype of an integrated CM filter with split ground layers is designed and constructed. Experimental results show the split winding can effectively shift the resonance frequency of filter inductor, and hence better filtering characteristics can be achieved.
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Citation
Hui-Fen Huang, and Mao Ye, "Parasitic Capacitance Cancellation of Integrated EMI Filter Using Split Ground Structure," Progress In Electromagnetics Research B, Vol. 43, 91-107, 2012.
doi:10.2528/PIERB12062107
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