Table of Contents
International Journal of Power Management Electronics
Volume 2008, Article ID 862510, 9 pages
Research Article

A Novel Soft-Switching Synchronous Buck Converter for Portable Applications

1Department of Electrical Engineering, National Institute of Technology, Rourkela 769008, India
2Department of Electronics and Communication Engineering, National Institute of Technology, Rourkela 769008, India

Received 8 June 2007; Revised 26 October 2007; Accepted 10 December 2007

Academic Editor: Burak Ozpineci

Copyright © 2008 Anup Kumar Panda et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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.