Cost effective resonant DC-DC converter for hi-power and wide load range operation

This paper describes an original topology for a stepdown DC-DC converter. This converter is a resonant converter with zero voltage switching and zero current switching. Regulation of the converter is done by PWM and variable frequency; this provides good regulation, from no load to full load. A prototype was built for an output power of 4 kW, an input voltage range of 280 VDC to 440 VDC, and an output voltage of 14 VDC. The prototype converter has an efficiency of 92-94%, is cost effective, and a good fit for high power and high current applications. The authors suggest that the presented topology is a better alternative to a typical phase-shift topology, with an additional advantage of being bi-directional