Wide Input Voltage Isolated Dc-Dc Converter with Interleaving Control

Abstract

In this paper, a novel interleaving control strategy for dc/dc converters is proposed and applied to a new isolated dc-dc converter configuration with two paralleled half-bridge structure at the primary side and a new rectification method at the secondary side of the transformers, aiming at to optimize the design of transformers and reduce the rectifier diodes voltage stresses. The concept of this new control scheme is to interleave the gate signals with an angle in two identical PWM controlled half-bridges. The two half-bridges work alternatively when the input voltage is high, but in series when the input voltage is low. The rectifier diode voltage stresses are reduced distinctly. The operation principle and key features of the proposed interleaving control scheme are illustrated and experimentally verified by a 50V/10A prototype.