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Elimination of transformer magnetizing current offset for digitally controlled phase-shift full-bridge converter

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5 Author(s)
Je-Hyung Cho ; Department of Electrical Engineering, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon, Republic of Korea ; Ki-Bum Park ; Jin-Sik Park ; Gun-Woo Moon
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A transformer magnetizing current offset for a phase-shift full-bridge (PSFB) converter is dealt in this paper. A model of this current offset is derived and it is presented as a first order system having a pole at a low frequency when the effects from the parasitic components and the switching transition are considered. A digital offset compensator eliminating this current offset is proposed and designed considering the interference in an output voltage regulation. The performances of the proposed compensator are verified by experiments with a 1.2kW PSFB converter. The saturation of the transformer is prevented by this compensator.

Published in:

Power Electronics and ECCE Asia (ICPE & ECCE), 2011 IEEE 8th International Conference on

Date of Conference:

May 30 2011-June 3 2011