An Isolated Bidirectional Single-Stage DC–AC Converter Using Wide-Band-Gap Devices With a Novel Carrier-Based Unipolar Modulation Technique Under Synchronous Rectification

A novel carrier-based unipolar-sinusoidal pulse width modulation (SPWM)-oriented modulation technique with synchronous rectification for isolated bidirectional single-stage high-frequency-ac link dc-ac converters using SiC MOSFET is presented in this paper. The dc-ac converter is composed of a full-...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-03, Vol.32 (3), p.1832-1843
Main Authors: Mengqi Wang, Suxuan Guo, Qingyun Huang, Wensong Yu, Huang, Alex Q.
Format: Article
Language:English
Subjects:
Bandwidths
Carrier-based unipolar modulation
Computer simulation
cycloconverter
Cycloconverters
DC-AC power converters
Electric converters
Electric potential
Energy conversion efficiency
Engineering
high-frequency ac link
Inductance
Inverters
Modulation
MOSFET
MOSFETs
Pulse duration modulation
Silicon carbide
Switches
Switching
Switching frequency
synchronous rectification
Transformers
Zero voltage switching
zero-current switching (ZCS)
zero-voltage switching (ZVS)
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Summary:A novel carrier-based unipolar-sinusoidal pulse width modulation (SPWM)-oriented modulation technique with synchronous rectification for isolated bidirectional single-stage high-frequency-ac link dc-ac converters using SiC MOSFET is presented in this paper. The dc-ac converter is composed of a full-bridge (FB) inverter cascaded with a cycloconverter through a high-frequency transformer. A carrier-based unipolar-SPWM-oriented modulation technique with synchronous rectification is proposed to realize zero-voltage-switching (ZVS) for the FB inverter and zero-current or zero-voltage-switching (ZVS/ZCS) for the cycloconverter in all load ranges, and to suppress the voltage spikes introduced by the transformer leakage inductance as well. In order to increase the switching frequency, efficiency, and power density, this paper proposes to utilize SiC MOSFETs for the converter. Synchronous rectification is implemented to further increase the converter efficiency. With the novel modulation technique, there are two switches in the cycloconverter that are continuously on at each interval, which eliminates on-fourth of the switching loss. A simulation model and a 400 VDC-240 VAC, 1.2=kW prototype have been developed to validate the effectiveness and performance of the proposed unipolar soft-switching modulation technique and SiC converter.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2564360