EMI reduction technique of flyback converter based on capacitance model of transformer with wire shield

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.

[1]  J. P. Keradec,et al.  The two-winding transformer: an experimental method to obtain a wide frequency range equivalent circuit , 1994 .

[2]  F.C. Lee,et al.  Common Mode Noise Reduction for Boost Converters Using General Balance Technique , 2006, IEEE Transactions on Power Electronics.

[3]  G. Sauerlaender,et al.  Energy based capacitance model for magnetic devices , 2001, APEC 2001. Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.01CH37181).

[4]  Dushan Boroyevich,et al.  Passive cancellation of common-mode noise in power electronic circuits , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[5]  Hung-I Hsieh,et al.  Techniques for reduction of common-mode EMI based on the concepts of current balance on the power transformer windings , 2013, 2013 1st International Future Energy Electronics Conference (IFEEC).

[6]  Jin-ho Choi,et al.  Designing Common-Mode (CM) EMI Noise Cancellation Without Y-Capacitor , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[7]  E. Waffenschmidt,et al.  Analytical modelling of winding capacitances and dielectric losses for planar transformers , 2004, 2004 IEEE Workshop on Computers in Power Electronics, 2004. Proceedings..

[8]  Abraham Dauhajre,et al.  Modelling and estimation of leakage phenomena in magnetic circuits , 1986, 1986 17th Annual IEEE Power Electronics Specialists Conference.