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.

Lossless Clamp Circuit With Turn-OFF Voltage and Current Reduction in High Step-Up DC–DC Converter With Coupled Inductor

“…Converter in [15] Converter in [5] Converter in [8] Converter in [22] Converter in [23] Converter in [31] Proposed converter T / D / C / SI / 2WCI / 3WCI 1/3/3/0/1/0 1/3/3/0/1/0 1/5/5/0/1/0 4/6//8/0/2/0 2/3/5/1/1/0 1/4/5/1/0/1 1/3/3/0/1/0…”

“…Voltage stress of the main active switch converters described in the literature [5], [8], [15], the voltage ripples across the clamp capacitor are low, the transistor is hard turning off and thus exhibits substantial voltage overshoots. In the proposed converter, switching losses are decreased due to the reduction of transistor turn-off voltage.…”

“…There are a lot of methods to achieve high voltage gain in nonisolated converters: SEPIC converter under resonant operation voltage multiplier cell, switched inductor, coupled inductor, and others [2][3][4][5][6][7][8]. Thanks to the coupled inductor and switched capacitor techniques converged, there is a possibility to achieve both high voltage gain and high efficiency while using a low number of components [1,[9][10][11].…”

“…In [5,6,10,[15][16][17][18][19][20], the non-isolated step-up converter with a tapped inductor and passive clamp circuit are presented. In these topologies, the passive clamp circuit consists of the diode and the capacitor.…”

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.…”