Title :
Design of a Digital Offset Compensator Eliminating Transformer Magnetizing Current Offset of a Phase-Shift Full-Bridge Converter
Author :
Cho, Je-Hyung ; Park, Ki-Bum ; Park, Jin-Sik ; Moon, Gun-Woo ; Youn, Myung-Joong
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
Abstract :
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.
Keywords :
digital control; power control; power convertors; power transformers; digital offset compensator; first-order system; output voltage regulation; phase-shift full-bridge converter; power 1.2 kW; transformer magnetizing current offset; Circuit faults; Magnetic flux; Magnetomechanical effects; Prototypes; Saturation magnetization; Switches; Voltage control; Digital control; magnetizing current offset compensator; magnetizing current offset model; phase-shift full-bridge (PSFB) converter; transformer current imbalance; transformer flux balance; transformer saturation;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2011.2158115
