A high step-up soft-single switched converter with three coupling inductors

Abstract

ABSTRACT This paper presents a new high voltage gain converter, which bases on the incorporation of the voltage multiplier cell and the switched coupled inductor technique, having low voltage stress on the switch, which is far from the output voltage. The presented topology is well suited for high step-up applications. By integrating coupled inductors and voltage multiplier cell techniques, a high step-up voltage gain is achieved. All of the semiconductor devices are switched under soft switching conditions, which reduces the switching losses significantly. The switch turns on at ZCS and turns off at ZVS. All diodes have soft-switching features and their reverse recovery problem is obviated due to the leakage inductance. The operation principles and theoretical analysis of proposed converter are presented in details. At the end, the experimental results have been taken from a laboratory prototype rated at 100 W, input voltage of 24 V, output voltage of 300 V, and switching frequency of 100 kHz.