Single-Switch High-Step-Up DC-DC Converter Employing Coupled Inductor and Voltage Multiplier Cell

Abstract

This paper introduces a high-step-up dc-dc converter to provide voltage boosting in lowvoltage applications. The circuit contains only a single active switch and is based on the boost-type converter using coupled inductor and voltage multiplier cell. The proposed topology exhibits high efficiency, reduced voltage stress on the semiconductors and requires a low component count. The circuit is intended for applications with rated power in the order of a few hundreds of Watts, which corresponds to the typical level of a single photovoltaic (PV) module. A detailed mathematical description of the circuit operation is carried out, providing the means for the adequate design of the converter. The dynamic analysis is also addressed in the paper, and proper closed-loop operation is demonstrated. A 400 W prototype operating at 90 kHz, with an input voltage range of 24-48 V and output voltage of 400 V was built and tested in laboratory. Experimental results validate the analyses carried out and measurements indicate efficiency levels up to 97.5%, which ratifies the proposed converter as a good solution for typical PV applications.INDEX TERMS High voltage gain, high step-up, coupled inductor, voltage multiplier cell.

A dual switches high step‐up DC–DC converter with low voltage stresses across switches

“…The coupled inductor (CI) with two-winding [19][20][21][22][23][24][25][26][27][28][29] and three-winding structures [30] is another solution to extend the voltage gain that has been widely paid attentions in recent years. Typically in these types of the converters, the input inductor of the CBC is replaced with the primary winding of the CI and the secondary winding is inserted in the SC VMC to improve voltage gain.…”