A Closed Loop Model of Modified SEPIC Based High Step-up DC-DC Converter

Since the output voltage of renewable energy system is low, the use of high step-up switched mode DC-DC converters is imperative. This paper presents a novel SEPIC based high step-up DC-DC converter that uses coupled-inductor (CL) technique and voltage multiplier rectifier (VMR), while the main characteristics of the conventional SEPIC converter is preserved. The proposed circuit comprises of a power switch (S), a CL, an input inductor, four diodes and five capacitors. The Voltage Tripler Rectifier provides a high voltage gain and the converter has a significantly reduced switching loss and diode recovery losses due to the quasi-resonance of the CL along with circuit capacitors. The operation principle, design and steady state analysis are discussed and the simulation results are also presented to justify the analysis. (C) 2019 Elsevier Ltd. All rights reserved.