Simplified Analytical Model for Estimation of Switching Loss of Cascode GaN HEMTs in Totem-pole PFC Converters*

doi:10.23919/CJEE.2019.000015

Chinese Journal of Electrical Engineering ›› 2019, Vol. 5 ›› Issue (3): 1-9.doi: 10.23919/CJEE.2019.000015

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Simplified Analytical Model for Estimation of Switching Loss of Cascode GaN HEMTs in Totem-pole PFC Converters^*

Qiqi Li, Bangyin Liu^*, Shanxu Duan

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Online:2019-09-25 Published:2019-12-20
Contact: * Email: lby@hust.edu.cn
About author:Qiqi Li received the B.S. degree in electrical engineering from Huazhong University of Science and Technology, Wuhan, China, in 2015, where he is currently working toward the Ph.D. degree in the School of Electrical and Electronics Engineering. His research interests include high voltage soft switching DC/DC converters and modular converter systems. Bangyin Liu received the B.S., M.S., and Ph.D. degrees in electrical engineering from Huazhong University of Science and Technology, Wuhan, China, in 2001, 2004, and 2008, respectively. He was a Postdoctoral Research Fellow with the Department of Control Science and Engineering, HUST, from 2008 to 2010, and is now an Associate Professor with the School of Electrical and Electronics Engineering, HUST. His current research interests include renewable energy applications, power quality and power electronics applied to power system. Shanxu Duan received the B.E., M.E., and Ph.D. degrees in electrical engineering from Huazhong University of Science and Technology, Wuhan, China, in 1991, 1994, and 1999, respectively. Since 1991, he has been a Faculty Member in the College of Electrical and Electronics Engineering, Huazhong University of Science and Technology, where he is currently a Professor. His research interests include stabilization, nonlinear control with application to power electronic circuits and systems, fully digitalized control techniques for power electronics apparatus and systems, and optimal control theory and corresponding application techniques for high-frequency pulsewidth-modulation power converters. Dr. Duan is a Senior Member of the Chinese Society of Electrical Engineering and a Council Member of the Chinese Power Electronics Society. He was selected as one of the New Century Excellent Talents by the Ministry of Education of China in 2007. He was also the recipient of the honor of “Delta Scholar” in 2009.
Supported by:
* Supported by National Key Research and Development Program of China (2016YFB0900400), National Natural Science Foundation of China (51777084), and Lite-On Research Program (HUST201501).

Abstract

Abstract: A practical analytical model to calculate the switching loss of cascode gallium nitride high electron mobility transistors (GaN HEMTs) is proposed. To facilitate analysis and application, the transmission delays introduced by Si MOSFET and interconnection inductances are ignored in modeling. Meanwhile, the nonlinear junction capacitances of the device and circuit stray inductances are also incorporated to increase the accuracy of the model. The turn-on and turn-off switching processes are described in detail and the simplified equations can be easily solved by using mathematical tools. Based on the analytical model, loss evaluation of totem-pole PFC converter is introduced briefly. Finally, the accuracy of the model is validated by comparing the calculated loss and converter’s efficiency with experiment results. Peak efficiency of 99.26% is achieved for a 3.6 kW single phase CCM Totem-Pole PFC AC/DC converter switching at 50 kHz based on 650 V cascode GaN HEMTs.

Key words: Analytical model, cascode GaN HEMTs, totem-pole PFC, efficiency evaluation

Qiqi Li, Bangyin Liu, Shanxu Duan. Simplified Analytical Model for Estimation of Switching Loss of Cascode GaN HEMTs in Totem-pole PFC Converters^*[J]. Chinese Journal of Electrical Engineering, 2019, 5(3): 1-9.

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Simplified Analytical Model for Estimation of Switching Loss of Cascode GaN HEMTs in Totem-pole PFC Converters^*

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