The proposed method reduces the losses of duty cycle occurred in converter and switching losses of the MOSFET. The energy stored in additional inductor L M which is used for producing ZVS condition is reduced during no load by auxiliary transformer. The new topology proposed in this work uses an ancillary transformer T A to increase the range of ZVS. The following are the harmful possessions on setup of converter due to the addition of external inductance: increases duty cycle loss, introduces parasitic oscillations in the transformers secondary side, the heat sink size increases, produces sudden rise of current, reduces the reliability and cannot suitable for no load conditions ( Jain et al., 2002 ). External inductors are placed in series through isolation transformer to achieve ZVS when the load varies. The switching losses in the converters can be reduced by the following methods: Connecting snubbers, resonant converters and soft switching converters ( Redl et al., 1991).Ī conventional (ZVS) full bridge dc-dc converter exploits the seepage inductance of isolating transformer with internal capacitance of switches in lieu of attaining zero voltage switching condition. High power conversion efficiency and low switching losses are the essential need for dc-dc converters used in power industries ( Nayak and Reddy, 2011).
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