This paper introduces a method for canceling the parasitic capacitance of integrated common mode (CM) filter by optimizing the layout of ground winding. Firstly, the CM filter 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 effectively improve the high frequency (HF) filtering 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 filter is simulated. The noise spectrums show conductive interference at high frequencies is effectively suppressed and meets the required electromagnetic interference (EMI) standard.
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