A Nonisolated Common-Ground High Step-Up Soft-Switching DC–DC Converter With Single Active Switch

Abstract

This paper presents a new non-isolated high gain (HG) dc-dc topology. Using a magnetically coupled inductor (MCI), the proposed topology can reach a higher voltage gain than those of other topologies with a moderate duty cycle. The voltage gain will be expanded further by enhancing duty cycle of the active power switch or the turn ratio (N). The resonance passive clamping circuits are presented to recycle the energy of leakage inductance and mitigating voltage spikes on the primary power MOSFET efficaciously. Then, the output diode's reverse-recovery problem is lightened by the resonance between leakage inductance and resonance capacitor. Accordingly, the efficiency of the presented HG converter can be improved. The active power switch turns ON and OFF in the zero current switching (ZCS) and zero voltage switching (ZVS) modes, respectively. The numerical investigation and MATLAB/Simulink simulations are depicted in detail. Likewise, an experimental setup is developed using a 100 W solar panel that supplies the suggested dc-dc converter, validating the introduced analysis and simulations.