Implementation of a ZVS/ZCS Isolated Boost Converter

An active clamp isolated boost circuit is presented in this paper. The active clamp circuit is employed in limiting voltage stress and create zero-voltage-switching (ZVS) turn-on feature for power switches. Moreover, the dual resonant tanks. are composed of leakage inductors and resonant capacitors can achieve zero-current-switching (ZCS) turn-off mechanism for output diodes at the secondary side of transformer. Hence, the reverse-recovery problem of output diodes can be eliminated. The operational principles, design consideration and realization are discussed. Finally, experimental results from a 400W prototype are presented to confirm the effectiveness of the proposed converter. Copyright (C) 2010 Praise Worthy Prize S.r.l. - All rights reserved.