Ultrahigh Step-Up Non-Isolated DC-DC Converter Based on Quadratic Converter without Coupled Inductor

This paper presents a novel ultrahigh voltage gain DC-DC converter, which consists of a quadratic boost converter and a multiplier cell. By employing this configuration, the voltage stress imposed on the majority of components is maintained below 0.25Vo, leading to a reduction in cost and volume. Furthermore, the proposed converter achieves a higher voltage gain compared to existing converters. Notably, the slope of the voltage gain curve surpasses that of other converters, enabling the possibility of achieving higher voltage gains at lower duty cycles. Experimental analysis of the converter demonstrates its unique operation by achieving a voltage gain of 27, distinguishing it from similar devices. Moreover, the input current is continuous, and there exists a common ground between the load and the input source. Through experimentation, the converter's dynamic and transient responses during varying conditions are evaluated, confirming its desirable characteristics. The converter is thoroughly analyzed, and the derived equations are employed for component design and performance comparison against other converters. A prototype with a power rating of 140W is implemented, converting an input voltage range of 14V-30V to 400V at the load side, making it suitable for renewable energy applications. The experimental results validate the feasibility and performance of the converter, establishing its capabilities as an ultrahigh step-up converter.