Design of a Digital Offset Compensator Eliminating Transformer Magnetizing Current Offset of a Phase-Shift Full-Bridge Converter

作者：Cho Je Hyung^*; Park Ki Bum; Park Jin Sik; Moon Gun Woo; Youn Myung Joong

来源：IEEE Transactions on Power Electronics, 2012, 27(1): 331-341.

DOI：10.1109/TPEL.2011.2158115

• Digital control
• magnetizing current offset compensator
• magnetizing current offset model
• phase-shift full-bridge (PSFB) converter
• transformer current imbalance
• transformer flux balance
• transformer saturation

A transformer magnetizing current offset for a phase-shift full-bridge (PSFB) converter is dealt with 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 1.2-kW PSFB converter. The saturation of the transformer is prevented and the efficiency is improved by this compensator.

• 出版日期2012-1