Single-Switch Single-Magnetic Core High Step-up Converter with Continuous Input Current and Reduced Voltage Stress for Photovoltaic Applications

In this paper, a novel step-up converter with single-switch, single-magnetic core and continuous input current is presented for photovoltaic applications. The proposed converter is obtained by integrating boost and Cuk converters so that only one switch and one magnetic core is utilized to provide a high voltage gain. This topology reduces voltage stress across the converter switch and diodes, and provides higher voltage gain compared with the basic boost and Cuk converters. Thus, high-quality and low-voltage MOSFET at moderate duty cycles can be used to increase the converter efficiency. Operating principles and experimental results of the proposed converter are presented in this study to demonstrate the validity of theoretical analysis.