Implementation of a ZVS interleaved converter with two transformers

This paper presents an interleaved converter with the feature of zero voltage switching (ZVS). Two buck-type converters connected in parallel have the same switching devices and operate under the interleaved pulse-width modulation (PWM). Thus the output ripple current in the proposed circuit is less than that in the conventional forward converter. Thus the size of the output choke and capacitor is reduced. Only two switches are used in the proposed circuit instead of four switches in the conventional parallel ZVS converter. Therefore the circuit components in the proposed converter are reduced. ZVS turn-on is achieved during the commutation stage of two complementary switches such that the switching losses thermal stresses on the semiconductors are reduced. Experiments based on a 330 W prototype are provided to verify the theoretical analysis and the effectiveness of the proposed converter.