期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 68, 期 11, 页码 10740-10749出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3034851
关键词
Inductors; Silicon; Gallium nitride; Rectifiers; Switches; Zero voltage switching; Bridge circuits; Gallium nitride (GaN); power factor correction (PFC); reverse recovery; totem-pole; zero-voltage switching (ZVS)
资金
- National Natural Science Foundation of China [51677085]
- Fok Ying-Tong Education Foundation, China [161054]
- Natural Science Foundation of Jiangsu Province, China
- Qing Lan Project of Jiangsu Province, China
This article investigates a cost-effective totem-pole power factor correction converter with high-frequency gallium nitride high electron-mobility transistors and low-frequency Si diodes. The reverse recovery characteristics of low-frequency diodes were experimentally evaluated, revealing the impact of negative current on switching frequency and the necessity of adopting an adaptive off-time soft-switching strategy.
A cost-effective totem-pole power factor correction converter with high-frequency gallium nitride high electron-mobility transistors and low-frequency Si diodes is investigated in this article. The reverse recovery characteristics of low-frequency diodes are evaluated experimentally. With the slow recovery characteristics, a negative current can flow through the low frequency diode, so that soft-switching and critical mode operation is achieved easily. However, if the duration of the negative current exceeds the reverse recovery time of the low-frequency diode, the diode will switch at high frequency, leading to severe losses and losing control of the inductor current. In order to avoid this issue, an adaptive off-time soft-switching strategy is adopted, and discontinuous conduction mode operation is suggested near the zero crossing of the grid voltage. Furthermore, since only the low-frequency grid current is sampled, this control strategy has the merits of low requirements on control resources and low cost. Experimental results of a 400W prototype are provided to verify the effectiveness of the proposed control strategy.
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