FPGA controlled Five- level soft switching full bridge dc-dc converter topology

Abstract

The use of conventional dc-dc converter is likely to decrease the efficiency because of the hard switching, which generates switching losses during switching on/off states. The proposed converter has the following desirable features: It requires only five control switches out of which four main control switches operate under zero voltage switching and one auxiliary control switch which operates under zero current switching; Three level voltage waveform before output filter can be achieved, which significantly reduces the value of filter inductance as compared to the existing topologies; Soft switching occurs at small value of leakage inductance of high frequency transformer; Modified phase shift pulse width modulated control method is used to achieve wide output range. Hence, the cost and switching losses are reduced to a greater extent, thus improves the overall efficiency of a system. This paper describes the main operational modes and design equations of the proposed converter. The simulation and experimental results are presented to validate the feasibility of proposed work.