A high step-up non-isolated DC-DC converter with active switched-inductor and switched-capacitor networks

Abstract

ABSTRACT This article proposes an enhanced non-isolated high-gain DC-DC converter for interfacing renewable energy sources (RESs). This converter utilizes active switched-inductor (ASL) and switched-capacitor (SC) networks in which the ASL network increases the voltage gain. Furthermore, using the SC network as a multiplier cell helps to reach a high voltage conversion ratio with a proper duty cycle. The main advantages of the proposed converter are the high voltage gain, continuous input current, and low voltage stress on the semiconductor switch and the passive component. Since the voltage stress of the semiconductor element is low, a low ON-state resistance switch is used, which leads to reduced conduction losses. Comprehensive analysis of the steady-state operation in continuous conduction mode (CCM), inductor and capacitor design, and a comparison considering other similar topologies are presented in this article. Also, the parasitic elements are assumed to calculate the DC-Voltage gain and the efficiency of the converter. Finally, simulation results are presented in the PSIM environment to validate the feasibility of the proposed converter.