Analysis and Implementation of an Interleaved Isolated DC-DC Converter

An interleaved isolated dc-dc converter with simple structure is presented in this paper. The proposed converter is operated in discontinuous conduction mode (DCM). The series-resonant tank composed by leakage inductor and resonant capacitor is used to achieve the ZCS turn-off feature for all rectifier diodes. Hence, the reverse-recovery problem can be eliminated Besides, the flux reset of transformer can be automatically achieved by resonant capacitors and the voltage stress of rectifier diodes is automatically clamped to output voltage. The advantages of the proposed converter are simple circuit configuration and high conversion efficiency. The operational principle, design consideration and circuit realization are discussed in this paper. Finally, experiments taken from a 320W laboratory prototype are presented to confirm the effectiveness of the proposed converter. Copyright (C) 2010 Praise Worthy Prize S.r.l. - All rights reserved.