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This paper introduces a method for canceling the parasitic capacitance of integrated common mode (CM) fllter by optimizing the layout of ground winding. Firstly, the CM fllter with positive or negative coupling between the ground and inductor winding is researched, respectively. Then, the two coupling polarizes are combined to form the bi-directional coupling, simulation and measured results show bi-directional coupling ground can efiectively improve the high frequency (HF) flltering performance. The equivalent circuits are given to demonstrate the cancellation mechanism, and modelling is derived for the design of ground winding. To further validate the application of proposed technique, CM noise and input/output signals for PFC (Power Factor Correction) converter with bi-directional coupling ground CM fllter are simulated. The noise spectrums show conductive interference at high frequencies is efiectively suppressed and meets the required electromagnetic interference (EMI) standard.

PARASITIC CAPACITANCE CANCELLATION OF INTEGRATED CM FILTER USING BI-DIRECTIONAL COUPLING GROUND TECHNIQUE