A Nonisolated Common-Ground High Step-Up Soft-Switching DC–DC Converter With Single Active Switch
Sohrab Abbasian, Mohammad Farsijani, Mohammad Tavakoli Bina, Amir Shahirinia
Abstract
In this article, we present a new nonisolated high-gain (HG) dc–dc topology. Using a magnetically coupled inductor, the proposed topology can reach a higher voltage gain than those of the 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 ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</i> ). The resonance passive clamping circuits are presented to recycle the energy of leakage inductance and mitigating voltage spikes on the primary power <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mosfet</small> efficaciously. Then, the output diode's reverse-recovery problem is lightened by the resonance between the leakage inductance and resonance capacitor. Accordingly, the efficiency of the presented HG converter can be improved. The active power switch turns <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> and <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> in the zero-current switching and zero-voltage switching 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.