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A Single-Stage Soft-Switched Isolated Three-Phase DC-AC Converter with Three-Phase Unfolder

Pal, A and Basu, K (2020) A Single-Stage Soft-Switched Isolated Three-Phase DC-AC Converter with Three-Phase Unfolder. In: IEEE Transactions on Power Electronics, 35 (4). pp. 3601-3615.

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Official URL: http://dx.doi.org/10.1109/TPEL.2019.2935875

Abstract

This article proposes a unidirectional, single-stage, three-phase, and high-frequency-link dc-ac converter. The converter uses three high-frequency transformers to provide galvanic isolation. In the primary, the converter has three half-bridge legs. In the secondary, three diode-bridge rectifiers are used. Each rectifier is followed by a half-bridge (unfolder) leg. The modulation strategy proposed in this article ensures zero-voltage switching of all six primary side switches over the entire line cycle without additional snubber circuit. The secondary half-bridge legs are switched at line frequency, incurring negligible switching loss. The proposed converter does not require any interstage bulky dc-link filter capacitor. Thus, the overall filtering requirement is reduced, and the converter reliability is improved. The high-frequency galvanic isolation improves the converter power density. In this article, the modulation strategy and converter operation are described in detail. The operation is validated in a 3.7-kW hardware prototype. Key experimental results are presented in this article.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to IEEE
Keywords: Bridge circuits; High frequency transformers; Pulse width modulation; Rectifying circuits; Zero voltage switching, Diode bridge rectifiers; Galvanic isolation; Hardware prototype; High frequency link; High-frequency links (HFL); Line frequency; Modulation strategy; Single stage, Electric inverters
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 13 Feb 2020 11:58
Last Modified: 13 Feb 2020 11:58
URI: http://eprints.iisc.ac.in/id/eprint/64501

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