Macquarie University
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GaN-based SEPIC DC-DC converters: design and performance comparisons

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posted on 2022-03-28, 00:48 authored by Viqar Ahmad
The need for more efficient and compact DC-DC converter design has directed recent research to the use of Gallium Nitride (GaN) High Electron Mobility Transistors (HEMTs), capable of achieving higher switching speeds, in place of Silicon (Si) Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) which are nearing their theoretical maximum performance limit. The Single-ended Primary Inductor Converter (SEPIC) is one of the simplest designs of DC-DC converter with a relatively low component count, yet is capable of both buck and boost operation. A GaN-based current-regulated SEPIC, is therefore attractive for applications such as in solid state lighting; which is the prime focus of this research. This thesis reports work conducted to evaluate GaN HEMT’s performance against a Si FET with matching specifications. This comparison was carried out over a range of frequencies and duty cycles. The results of this work show a marked improvement in performance efficiency of GaN in comparison to Si over MHz frequency range. Moreover, a GaN-based SEPIC using discrete components having current regulation was developed. The underlying idea for building this circuit is to develop a regulated simple and efficient power supply, capable of being integrated for solid state lighting applications in the future.


Table of Contents

Chapter 1. Introduction -- Chapter 2. Review of GaN-based converter-inverter desifgns -- Chapter 3. GaN-based SEPIC design using transphorm board -- Chapter 4. Modelling, design and analysis of GaN-based current-regulated SEPIC -- Chapter 5. Conclusions and future work.


Empirical thesis. Bibliography: pages 54-58

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


MRes, Macquarie University, Faculty of Science and Engineering, Department of Engineering

Department, Centre or School

Department of Engineering

Year of Award


Principal Supervisor

Graham Town


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