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Parasitic Effects of Grounding Paths on Common-Mode EMI Filter's Performance in Power Electronics Systems

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6 Author(s)
Shuo Wang ; Dept. of Electr. & Comput. Eng., Univ. of Texas at San Antonio, San Antonio, TX, USA ; Maillet, Y.Y. ; Fei Wang ; Rixin Lai
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High-frequency common-mode (CM) electromagnetic-interference (EMI) noise is difficult to suppress in electronics systems. EMI filters are used to suppress CM noise, but their performance is greatly affected by the parasitic effects of the grounding paths. In this paper, the parasitic effects of the grounding paths on an EMI filter's performance are investigated in a motor-drive system. The effects of the mutual inductance between two grounding paths are explored. Guidelines for the grounding of CM EMI filters are derived. Simulations and experiments are finally carried out to verify the theoretical analysis.

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Industrial Electronics, IEEE Transactions on  (Volume:57 ,  Issue: 9 )