High-Efficiency High-Density Critical Mode Rectifier/Inverter for WBG-Device-Based On-Board Charger

被引:169
作者
Liu, Zhengyang [1 ]
Li, Bin [1 ]
Lee, Fred C. [1 ]
Li, Qiang [2 ]
机构
[1] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA
[2] Virginia Polytech Inst & State Univ, Ctr Power Elect Syst, Blacksburg, VA 24061 USA
关键词
On-board charger (OBC); power factor correction (PFC); SiC; totem pole; widebandgap (WBG); zero-voltage switching (ZVS); GAN HEMT;
D O I
10.1109/TIE.2017.2716873
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
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(3) power density and above 96% efficiency.
引用
收藏
页码:9114 / 9123
页数:10
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