Analysis and Design of Current-Fed High Step Up Quasi-Resonant DC-DC Converter for Fuel Cell Applications

Abstract

In this project a Soft-Switching  DC-DC  Converter  with  low  voltage and  current  stresses  on  switches  and  high  voltage  gain  is proposed.  The voltage and current stresses of switches are considerably reduced.  As  a  result  a  reduction  of switching  losses  in  turn  ON  and  OFF  states  of  switching  is obtained.  Also, using soft-switching method results lower losses. In  the  result  of ZCS  in  output  diodes,  reverse  recovery  problem of  diodes  is  alleviated.  Because of total reduction of losses, efficiency is improved.  The proposed converter is a quasi-resonant converter controlled by Pulse Width Modulation (PWM) method.