Effect of Additional Capacitor and Diode to A Single-Ended Primary Inductor Converter (SEPIC) Dc-Dc Converter For Offgrid System Based Photovoltaic (PV) Applications

For a stand-alone based photovoltaic (PV) applications, this article analyzes the implications of adding certain components to the single-ended primary inductor converter (SEPIC). A capacitor and a diode were added to the new topology's design. The added capacitor was used to boost and shaped the signal coming out from the power switch while the diode serves as a reverse back diode. The suggested topology showed that adding just two components to the standard SEPIC minimizes stress on the active components, particularly the power switch. Other advantages of the this methods are minimizing the value of duty cycle, extended voltage gain, less voltage stress over the power switch, a low density, and less cost. Following the realization of this new topology, a laboratory prototype was created to verify the viability of the new converter. A 125 V DC output was produced from a 12 V DC input using Matlab/Simulink. Keywords: DC-DC SEPIC Converter, Voltage transfer ratio (voltage gain), Duty cycle, Voltage stress across the semiconductor components, and Photovoltaic (PV) panel