Study and implementation of an interleaved buck converter with asymmetric phase-shift control

Abstract

This paper proposes a new control algorithm to improve the defect of the cited interleaved twin-buck converter in the literature. The algorithm can adjust the voltage gain by modulation the duty cycle. And by asymmetrically phase-shift the turn-on periods of the two actives switches, i.e. partially overlapping the turn-on intervals, one of the active switch can benefit from zero-voltage switching. When duty cycle is less than 50%, the problem of failure to zero-voltage switching on of the cited interleaved twin-buck converter can be improved. The switch with soft-switching will enhance the converter efficiency. In addition, heat issue cause by switching loss can be decreased and output voltage ripple can be lowered.