A New Coupled-Inductor-Based Quadratic DC/DC Converter With Low Current Stress

This article presents a new ultrahigh-voltage gain DC/DC converter for renewable energy sources applications. In the presented topology, a three-winding coupled-inductor (TWCI) and a switch-capacitor network are employed in a classic quadratic boost converter to produce a high voltage gain while ensuring continuous input current and common ground between the input source and output load sides. This circuit has a semi-trans-inverse feature; therefore, higher voltage gain can be obtained under a very low number of turn ratios of the TWCI. Moreover, the current sharing between the TWCI and input inductor of this topology minimizes the power dissipation of the active switches and the magnetic components. In this circuit, two passive clamp circuits are used to limit the voltage stresses of the active switches, which are operated in simultaneous switching patterns. Detailed steady-state analysis, power loss estimations, comparison studies, and design considerations are provided. Finally, a sample prototype (200 W) has been implemented to verify the theoretical analysis of the proposed converter.