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A common mode EMI reduction technique of a flyback converter using a wire shield is presented. The capacitance model of the flyback transformer is derived and it is used to determine the values of the wire shield turns and compensation capacitor minimizing the noise voltage. The experimental results for an actual adaptor are provided to verify the effectiveness of the proposed method.
A new asymmetrical winding Common Mode (CM) choke capable of attenuating the Differential Mode (DM) noise is proposed in this paper. In case of conventional symmetrical winding CM choke, the CM and DM noises are attenuated by the magnetizing and leakage inductors of CM choke, respectively. However, since the number of turns is limited by the shape and size of the CM choke, it is very difficult to...
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