Research on High Step-Up DC-DC Converters with Three-Winding Coupled Inductor

DC-DC converters with the ability to boost the voltage are widely used in many power conversion applications. To address the increasing demand, new power converter topologies have been introduced with different voltage-boosting techniques and their combinations. The three-winding coupled inductor is a proven technique in these applications. This technique gives significant advantages, such as higher voltage gains, greater flexibility in adjusting the voltage gain and voltage stress, and enhanced design flexibility. This paper presents a review of recent high step-up DC-DC converter topologies utilizing three-winding coupled inductor. In these converters, not only the coupled inductor technique has been utilized, but also techniques such as switched-capacitor/switched-inductor (SC/SI) cells have been employed. This study analyses the different topologies from various perspectives, including the number of circuit elements, soft-switching capability, mitigation of the reverse recovery issue, continuous input current characteristics, voltage gain, voltage stress across the main switch and output diode, common ground configuration, and overall conversion efficiency. Finally, a comprehensive evaluation of each's strengths and weaknesses is presented.