Analysis and Design of a Zero-Voltage-Switching PWM DC-DC Converter without Auxiliary Circuit

Analysis and Design of a Zero-Voltage-Switching PWM DC-DC Converter without Auxiliary Circuit

This paper proposes a family of zero-voltage-switching (ZVS) pulse-width-modulated (PWM) dc-dc converters with no auxiliary circuit. The proposed converters do not require any auxiliary ZVS circuit to provide ZVS functions to the switches. This development reduces costs in production and the system maintains a power efficiency of greater than 96% at rated load. The proposed converter operates at a constant frequency, and all switches have on and off ZVS. In comparison to the hard switching converter counterpart, this system has no overvoltage across the switches and no additional current stress. The theory of the ZVS-PWM was proposed and a prototype was constructed and tested. Testing and analysis of the prototype confirmed the actual ability of this family of ZVS-PWM converters.