Asynchronous Gating Strategy for Auxiliary-Free Soft Switching in Parallel-Active Interleaved Buck Converter

Md Rezanul Haque; Md. Abdur Razzak; Sunny Gao; Md. Enamul Haque; K. M. A. Salam; Amanullah Maung Than Oo; Foad Taghizadeh

doi:10.1049/pel2.70266

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Asynchronous Gating Strategy for Auxiliary-Free Soft Switching in Parallel-Active Interleaved Buck Converter

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Asynchronous Gating Strategy for Auxiliary-Free Soft Switching in Parallel-Active Interleaved Buck Converter

Md Rezanul Haque, Md. Abdur Razzak, Sunny Gao, Md. Enamul Haque, K. M. A. Salam, Amanullah Maung Than Oo and Foad Taghizadeh

IET Power Electronics, Vol.19, pp.1-14

2026

DOI: https://doi.org/10.1049/pel2.70266

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Abstract

Conventional interleaved buck converters frequently rely on bulky resonant networks to achieve soft switching. To address this limitation, this paper proposes a novel asynchronous gating strategy that achieves auxiliary-free Zero-Voltage and Zero-Current Switching (ZVS/ZCS) for parallel-active-switch interleaved converters. By utilising active current commutation, the method dynamically eliminates transition overlaps, fundamentally suppressing switching losses and electromagnetic interference (EMI) without added components. The converter's operating principles are mathematically modelled and supported by frequency response analysis. Comparative evaluations demonstrate the topology lowers total diode current stress by up to 92.7%, yielding a 98.28% peak theoretical efficiency. Furthermore, the design exhibits exceptional thermal robustness; peak switch dissipation is restricted to 1.134 W, bounding uncooled junction temperatures to 95.29 degrees C. A 20-year reliability assessment verifies long-term resilience, confirming 76.49% open-circuit and 4.79% short-circuit survival probabilities. Finally, the theoretical framework is comprehensively validated via MATLAB/Simulink simulations and a laboratory hardware prototype. Experimental results confirm sustained ZVS/ZCS realisation and record more than 96% peak operating efficiency. This validates the proposed gating strategy as a highly reliable, structurally simplified, and efficient solution for step-down dc-dc converters.

Details

Title: Asynchronous Gating Strategy for Auxiliary-Free Soft Switching in Parallel-Active Interleaved Buck Converter
Authors: Md Rezanul Haque (Author) - Macquarie University
Md. Abdur Razzak (Author) - Independent University, Bangladesh
Sunny Gao (Author) - Macquarie University
Md. Enamul Haque (Author) - Deakin University
K. M. A. Salam (Author) - North South University
Amanullah Maung Than Oo (Author) - University of the Sunshine Coast
Foad Taghizadeh (Corresponding Author) - Macquarie University
Publication details: IET Power Electronics, Vol.19, pp.1-14
Publisher: The Institution of Engineering and Technology
Date published: 2026
DOI: 10.1049/pel2.70266
ISSN: 1755-4543
Copyright note: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. © 2026 The Author(s). IET Power Electronics published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.
Data Availability: This study is based on simulated and laboratory data. Further details are available from the corresponding author upon request.
Organisation Unit: University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 991246278802621
Output Type: Journal article

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