High step‐up DC–DC converter based on coupled‐inductor for renewable energy systems

Abstract

The present study introduced a novel soft‐switched high step‐up DC–DC converter based on coupled inductors. The higher boost‐factor is achieved relying on previous topologies by adjusting the turns ratio of the coupled inductors. Thus, the proposed converter provides a higher voltage gain with lower duty ratios. Two active clamp circuits are employed to clamp the voltage spikes resulted from parasitic inductances. This active clamp circuit provides zero‐voltage switching turn‐on operations and zero‐current switching turn on/off operations for active switches and power diodes, respectively. In addition, the equivalent leakage inductance of the coupled inductors is placed in series with the power diodes, which significantly alleviates the reverse‐recovery problem of diodes. The other features of the proposed topology include fewer components, low cost, small input current ripple, and the low voltage stress on power switches. Low voltage stress allows choosing a lower voltage rating metal–oxide–semiconductor field‐effect transistor, which directly reduces the cost. The experimental results evaluated the performance of the proposed topology. For this purpose, a 48 V/380 V/500 W laboratory prototype was built and tested, and the results confirmed the performance of the presented converter.

Presented a transformer‐less buck‐boost DC–DC structure with vast voltage range

“…Moreover, utilizing magnetic coupling increases the volume and value of the converter and complicates its structure [23]. Therefore, this structure cannot be a suitable choice for the green energy usage [24]. Consequently, it is necessity to develop a buck‐boost converter with a wide voltage conversion range, a simple structure and having low cost to be suitable for renewable sources for example solar cells and fuel cells.…”

High step‐up combined boost‐Cuk converter with switched‐inductor

“…In the past 10 years, considerable attention has been paid to use of green energy. The use of renewable energy gradually increases the demand for DC–DC converters [1]. The classic boost converter is unable to provide a high voltage gain.…”

Modular DC‐DC converter with reduced current ripple and low voltage stress suitable for high voltage applications

“…A key factor in classifying high step‐up dc‐dc topologies is electrical connections between their components, which can be categorized into two stages: non‐isolated and isolated converters. However, the existence of complicated high‐frequency transformers in the structure of the isolated converters causes employing the non‐isolated techniques are considered more efficient: on condition that the isolation is unnecessary 7,8 . One of the most conventional non‐isolated converters is boost converter, which has a simple structure and control strategy 9 .…”