Design Consideration and Experimental Validation of a Common Grounded High Step-Up DC-DC Converter With High Voltage Gain in Both High and Low Duty Cycles

In this paper, a new non-isolated high step-up DC-DC converter is proposed, which can achieve high voltage gains in both low and high duty cycles. This allows different high voltage gains to be achieved in either low and high duty cycles. Therefore, by changing the duty cycle in proper time periods, the voltage stress on switches could be modified in a way that they can achieve a better life span, without having any noticeable change in the output voltage. The structure of the converter reduces the voltage stress on switches with small number of elements and the output voltage ripple is lower than 1% of the output voltage using a small capacitor. The input current remains continuous, and the converter maintains a common ground between input and output terminals, making it ideal for battery storage systems and renewable energy applications such as photovoltaic (PV) panels. The paper thoroughly examines the operation in Continuous Conduction Mode (CCM), including an efficiency analysis, the derivation of the small-signal model, and closed-loop analysis. Additionally, the Discontinuous Conduction Mode (DCM) operation is explored in detail. The proposed converter is benchmarked against other boost converters, and a laboratory-scale prototype is constructed to validate the theoretical findings through experimental results.