A comparative analysis of 4KW PSBs for welding machine

Abstract

The paper deals about the study conducted to evaluate the reliability of H bridge topology, for a DC/DC converter with phase-shift modulation strategy, with three different power devices. The first one is based on 500 V 0.087? 46 A HEXFET/sup /spl trade// power MOSFETs, the second one adopts MDmesh/sup /spl trade// power MOSFETs with external Schottky and ultrafast diodes in order to shunt the reverse current and the third one is based on CoolMOS power MOSFETs integrating the diodes in the same package. Each of them is reviewed, prototyped and investigated. Experimental results show the technological limits of each solution and suggest their right application range.