A Novel Soft-Switching Synchronous Buck Converter for Portable Applications

Anup Kumar Panda,  Swapnajit Pattnaik   and K. K. Mohapatra
National Institute of Technology, Rourkela 769008, India, Received 8 June 2007; Revised 26 October 2007; Accepted 10 December 2007 Academic


This paper proposes a zero-voltage-transition (ZVT) pulse-width-modulated (PWM) synchronous buck converter, which is designed to operate at low voltage and high efficiency typically required for portable systems. A new passive auxiliary circuit that allows the main switch to operate with zero-voltage switching has been incorporated in the conventional PWM synchronous buck converter. The operation principles and a detailed steady-state analysis of the ZVT-PWM synchronous converter implemented with the auxiliary circuit are presented. Besides, the main switch and all of the semiconductor devices operate under soft-switching conditions. Thus, the auxiliary circuit provides a larger overall efficiency. The feasibility of the auxiliary circuit is confirmed by simulation and experimental results.

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