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Lookup NU author(s): Nail Tosun, Dr Devinda MolligodaORCiD, Dr Xu DengORCiD, Professor Barrie MecrowORCiD
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© 2013 IEEE.Current-source inverters (CSIs) remain an attractive alternative to voltage-source inverters (VSIs) because they can provide inherent voltage boosting for high-speed operation, deliver low-distortion current waveforms, and mitigate motor-side electromagnetic interference. The rapid adoption of GaN and SiC devices further strengthens this value proposition, yet the sub-nH gate-loop inductance demanded by GaN switches can only be satisfied by half-bridge modules with integrated gate drivers. Their deployment in CSI topologies has, however, been constrained by shoot-through susceptibility under conventional modulation. This paper introduces a single-stage CSI motor drive that leverages an integrated GaN half-bridge module and a tailored near-state PWM strategy that removes zero-state vectors. The resulting modulation prevents shoot-through events, thereby enabling the use of integrated half-bridge drivers with CSIs, while simultaneously reducing the dc-link inductance requirement, common mode voltage (CMV), and switching losses. Although the attainable modulation index is currently confined to the range 2/3–1, practical extensions are discussed with reference to near-state VSI implementations. Analytical insights are substantiated through experimental validation on a 100 W, 100 krpm prototype drive, built with GaN half-bridge modules featuring integrated gate drivers.
Author(s): Tosun N, Molligoda D, Deng X, Mecrow BC
Publication type: Article
Publication status: Published
Journal: IEEE Journal of Emerging and Selected Topics in Power Electronics
Year: 2026
Pages: epub ahead of print
Online publication date: 12/05/2026
Acceptance date: 02/04/2018
ISSN (print): 2168-6777
ISSN (electronic): 2168-6785
Publisher: Institute of Electrical and Electronics Engineers Inc.
URL: https://doi.org/10.1109/JESTPE.2026.3692437
DOI: 10.1109/JESTPE.2026.3692437
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