Nonisolated Topology for High Step-Up DC-DC Converters

Abstract

A new dc-dc converter structure with high voltage gain is proposed in this paper. The proposed converter consists of two switches that are turned on and off simultaneously. In addition, the two switched-capacitor cells and one energy storage cell are utilized in the structure of the proposed converter. These result in high voltage gains at low values of the duty cycle. Besides, the voltage stress across the power devices is low and below half of the output voltage. Therefore, the MOSFET switches with low RDS-on and devices with reduced nominal voltage can be used in the proposed converter which in turn reduces the conduction and turn-on losses. The operating principles of the proposed topology are explained, and the analysis of voltage and current stresses of the devices is accomplished. The circuit performance is compared with other solutions in the literature in terms of voltage gain and normalized voltage stress of switches and diodes. Eventually, in order to verify the theoretical analysis, the experimental results are provided.