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A Single-Stage Soft-Switched Isolated Three-Phase DC–AC Converter With Three-Phase Unfolder.
- Source :
-
IEEE Transactions on Power Electronics . Apr2020, Vol. 35 Issue 4, p3601-3615. 15p. - Publication Year :
- 2020
-
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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08858993
- Volume :
- 35
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Power Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 141220817
- Full Text :
- https://doi.org/10.1109/TPEL.2019.2935875