Design and implementation of isolated 30 V, 30 A DC power supply using synchronous rectifier

Abstract

With advancement in modern power electronics, low voltage, high current DC power supply is used extensively in industrial applications like arc furnace, fusion technology, arc welding etc. Conventional isolated full bridge DC-DC converter has many limitations like lower efficiency, higher weight and size. The main aim of this paper is to meet design requirements for many industrial applications like isolation between source and load, minimization of switching loss, high conversion efficiency, lower output voltage and current ripple and compactness. Phase shifted full bridge topology along with ZVS (Zero Voltage Switching) is selected to reduce switching losses and to improve the performance of the power supply. In low voltage applications, conduction loss of the diode bridge rectifier at secondary side contributes significant power losses. To improve the efficiency of converter synchronous rectifier technique is adopted. Simulation is done in PSIM software to validate the performance of power supply with isolated phase shifted full bridge topology along ZVS and center tap synchronous rectifier.