Efficient Current Fed Half Bridge Isolated Converter With-out Snubber For Fuel Cell Applications

Abstract — This paper presents a new class of current fed converter for a power electronic interface for fuel cell applications, photovoltaic inverters, etc. The proposed circuit shows advantage over conventional hard switched current fed half bridge isolated dc/dc converter and active clamped ZVS current fed half bridge isolated dc/dc converter with a simple solution to switch turn-off voltage spike problem without any additional snubber as in active clamped ZVS converter. It leads in reduced size, lower cost, and higher efficiency. A formal mathematical description was arriving at design parameters is also touched upon, for 250W converter. The results of the proposed topology are study in detail through simulation in PSIM 9.0 platform and results are presented with efficiency of 95%