Design and Implementation of Nonisolated High Step-Up DC-DC Converter

Abstract

This article presents a novel structure for a high step-up DC-DC converter. The proposed converter offers several advantages, including a simple structure, high voltage gain, high efficiency, reduced voltage stress on the semiconductors, and fewer components. A two-winding coupled inductor has been employed to enhance the output voltage level in this topology. The suggested structure has only one power switch with low ON-state resistance (RDS-ON), reducing power losses. Moreover, the zero-voltage switching (ZVS) and zero-current switching (ZCS) features of the diodes of the proposed converter result have improved overall efficiency. To evaluate and ascertain the enhanced performance of this configuration, the study of different modes of operation, steady-state investigation, and a comparative study between the proposed and other relevant topologies are presented. A laboratory prototype is designed and implemented with an input voltage of 12 V, an output voltage of 150 V, and a 200 W rated power level under a 50 kHz switching frequency. The maximum efficiency of the recommended topology is measured at the rated output power, equal to 96.98%. Also, for an output power range from 50 W to 350 W, the efficiency is obtained higher than 95%.