A ZVS-PWM full-bridge boost converter for applications needing high step-up voltage ratio

摘要

Pulse-width modulated (PWM) full-bridge boost converters are used in applications where the output voltage is considerably higher than the input voltage. Zero-voltage-switching (ZVS) is typically implemented in these converters. A new ZVS-PWM full-bridge converter is proposed in this paper. The proposed converter does not have any of the drawbacks that other converters of this type have, including a complicated auxiliary circuit, increased current stresses in the main power switches and load dependent ZVS operation. In this paper, the operation of the new converter, its steady-state characteristics, and its design are explained and examined. The feasibility of the converter is confirmed with results that are obtained from an experimental prototype.