A new family of zero-voltage-transition PWM converters with dual active auxiliary circuits

Abstract

A new family of active auxiliary circuits that allow the power switch in single switch, pulse width modulated (PWM) converters to operate with zero voltage switching (ZVS) is proposed in this paper. The switch in an auxiliary circuit belonging to this family can operate with a zero current switching (ZCS) turn-on and turn-off without increasing the peak current stresses of the main switch. In the paper, the fundamental principles behind the proposed family of active auxiliary circuits are explained. Based on these principles, an example auxiliary circuit is systematically derived and presented along with several other auxiliary circuits of the new family. The operation of a boost converter operating with the example auxiliary circuit is described, and general guidelines for the design and implementation of auxiliary circuits belonging to the new family are given. The feasibility of the example auxiliary circuit is confirmed by experimental results obtained from a 500 W, 100 kHz boost converter laboratory prototype