Analysis of a ZVS Converter with Series Connection Transformers

A soft switching converter to achieve zero voltage switching (ZVS) turn-on for power switches is presented in this paper Two circuit cells are connected in parallel at the primary side in order to achieve ripple current reduction at input capacitor and to reduce the size of transformer core Active snubber is connected between two transformers in order to absorb the energy stored in leakage and magnetizing inductances and to limit voltage stresses across switches Output capacitance of two switches and leakage inductance of two transformers are resonant during the commutation stage of main and auxiliary switches Thus power switches can be turned on at ZVS Circuit configuration, operation principles and design considerations are presented Finally, laboratory experiments with a 300W prototype, verifying the effectiveness of the proposed converter are described Copyright (C) 2010 Praise Worthy Prize S r l. - All rights reserved