New high step-up coupled dual winding quadratic enhanced SEPIC DC-DC converter

Abstract

This paper introduces a non-isolated high step-up dc-dc converter originated from single-ended primary-inductor converter (SEPIC). The suggested dual winding quadratic enhanced SEPIC converter (DWQ-ESC) employs a voltage-boosting module to attain superior boost ability. A unique coupled inductor is exploited to regulate the boost factor by tuning the transformer's turns ratio along with the switching duty cycle. Additionally, very high boost factor is achieved at low transformer's turns ratio (limited around 1.0). As a result, low winding turns ratio is required for very high gain applications. Also, a clamping circuit is considered to eliminate the leakage inductance effects of the coupled inductor across the power switch. A single switch with a full control range of duty cycle ($0 < \mathrm{D} < 1$) is utilized in the proposed DWQ-ESC that results in low conducting losses and high efficiency. The introduced DWQ-ESC drains a smooth current from the input dc source that makes it appropriate for renewable energy sources (RES) such as photovoltaic (PV) and wind sources. Theoretical analysis and simulation results are presented in the paper to demonstrate that the introduced topology can obtain high boost factor with a reduced duty ratio in comparison with existing similar quadratic dc-dc converters.