Presentation Details
| Split-Sine Modulated GaN Micro-Inverter with Cascaded Boost and H-Bridge Vishal Kumar Meena, Alex Q.Huang. Semiconductor Power Electronics Center, The University of Texas at Austin, Austin, TX, USA |
Abstract
High-efficiency micro-inverters are essential for maximizing energy harvest in photovoltaic (PV) systems; however, achieving the required high voltage gain from low-voltage PV modules remains challenging. Transformer-based and two-stage micro-inverter architectures increase system cost, volume, and cumulative power losses. This paper presents a transformerless split-sine modulated GaN micro-inverter that integrates maximum power point tracking (MPPT) and modulation of the high-amplitude portion of the sinusoidal voltage directly into cascaded DC–DC boost stages, while the H-bridge operates only as a line-frequency unfolding and buck stage. By shifting all high-frequency, high-voltage modulation to the cascaded converters, the proposed architecture eliminates high-voltage switching in the H-bridge, thereby reducing switching losses and common-mode leakage currents. A 1.2 kW GaN-based hardware prototype is designed for experimental validation, targeting a system efficiency greater than 97% while achieving high power density. Simulation and preliminary hardware results validate the effectiveness of the proposed approach.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
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