Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/222740
Title: High-Efficiency High-Density Critical Mode Rectifier/Inverter for WBG-Device-Based On-Board Charger
Authors: Zhengyang Liu;Bin Li;Fred C. Lee;Qiang Li
Year: 2017
Publisher: IEEE
Abstract: A widebandgap-based bidirectional on-board charger (OBC) has been proposed with a variable dc-link voltage, which tracks the battery voltage fluctuation. Although this approach is deemed most efficient for the resonant dc/dc stage, it posts significant challenges for the rectifier/inverter stage, which operates in the critical mode to realize zero-voltage switching (ZVS), while subjecting to the large variations of input and output voltages. Design considerations of the ac/dc stage are presented in this paper, including: the evaluation of 1.2-kV SiC MOSFETs; the ZVS extension techniques to realize ZVS under all input/output variations; and a novel universal control strategy for both the rectifier mode and the inverter mode. A prototype is built which achieves 98.5% efficiency at a switching frequency higher than 300 kHz. Furthermore, a 6.6-kW OBC system is demonstrated, using both SiC and GaN devices with 37-W/in<sup>3</sup> power density and above 96% efficiency.
URI: http://localhost/handle/Hannan/222740
volume: 64
issue: 11
More Information: 9114,
9123
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7951033.pdf1.96 MBAdobe PDF
Title: High-Efficiency High-Density Critical Mode Rectifier/Inverter for WBG-Device-Based On-Board Charger
Authors: Zhengyang Liu;Bin Li;Fred C. Lee;Qiang Li
Year: 2017
Publisher: IEEE
Abstract: A widebandgap-based bidirectional on-board charger (OBC) has been proposed with a variable dc-link voltage, which tracks the battery voltage fluctuation. Although this approach is deemed most efficient for the resonant dc/dc stage, it posts significant challenges for the rectifier/inverter stage, which operates in the critical mode to realize zero-voltage switching (ZVS), while subjecting to the large variations of input and output voltages. Design considerations of the ac/dc stage are presented in this paper, including: the evaluation of 1.2-kV SiC MOSFETs; the ZVS extension techniques to realize ZVS under all input/output variations; and a novel universal control strategy for both the rectifier mode and the inverter mode. A prototype is built which achieves 98.5% efficiency at a switching frequency higher than 300 kHz. Furthermore, a 6.6-kW OBC system is demonstrated, using both SiC and GaN devices with 37-W/in<sup>3</sup> power density and above 96% efficiency.
URI: http://localhost/handle/Hannan/222740
volume: 64
issue: 11
More Information: 9114,
9123
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7951033.pdf1.96 MBAdobe PDF
Title: High-Efficiency High-Density Critical Mode Rectifier/Inverter for WBG-Device-Based On-Board Charger
Authors: Zhengyang Liu;Bin Li;Fred C. Lee;Qiang Li
Year: 2017
Publisher: IEEE
Abstract: A widebandgap-based bidirectional on-board charger (OBC) has been proposed with a variable dc-link voltage, which tracks the battery voltage fluctuation. Although this approach is deemed most efficient for the resonant dc/dc stage, it posts significant challenges for the rectifier/inverter stage, which operates in the critical mode to realize zero-voltage switching (ZVS), while subjecting to the large variations of input and output voltages. Design considerations of the ac/dc stage are presented in this paper, including: the evaluation of 1.2-kV SiC MOSFETs; the ZVS extension techniques to realize ZVS under all input/output variations; and a novel universal control strategy for both the rectifier mode and the inverter mode. A prototype is built which achieves 98.5% efficiency at a switching frequency higher than 300 kHz. Furthermore, a 6.6-kW OBC system is demonstrated, using both SiC and GaN devices with 37-W/in<sup>3</sup> power density and above 96% efficiency.
URI: http://localhost/handle/Hannan/222740
volume: 64
issue: 11
More Information: 9114,
9123
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7951033.pdf1.96 MBAdobe PDF