A Non-Isolated High Step-Up DC–DC Converter Based on Switched Capacitor and Quadratic Cell With Reduced Voltage Stress on Semiconductors

Abstract

This paper introduces a non-isolated high step-up DC–DC converter with reduced voltage stress on semiconductors. The proposed structure is based on two boosting techniques: a switched capacitor (SC) cell and a quadratic cell (QC). The proposed converter uses the advantages of SC and QC simultaneously to increase the voltage gain. Consequently, the converter has a much higher voltage gain compared to similar structures. High voltage gain, low voltage stress across semiconductors, no limitation of duty cycle, continuity of its input current, and the existence of a common ground between input and output ports are the most substantial features of the proposed converter and make it suitable for renewable energy applications. Among the compared high-step-up DC–DC converters, the suggested topology provides higher voltage gains at lower duty cycles. The power density of the proposed converter is improved. So, the volume of the suggested converter is reduced. Moreover, to prove the superiority of the proposed converter, the operation principles, steady-state analysis, and comparison with other similar high step-up DC–DC converters are presented. Voltage gain and voltage stress across semiconductors are compared and analyzed. Finally, the experimental results are displayed to prove the effectiveness of the proposed converter.