Yan-Fei Liu

Professor, Chair of Graduate Studies



Dr. Liu (Fellow of IEEE, 2013, Fellow of CAE, 2018) received his Bachelor and Master degree from the Department of Electrical Engineering from Zhejiang University, China, in 1984 and 1987, and Ph.D. degree from the Department of Electrical and Computer Engineering, Queen’s University, Kingston, ON, Canada, in 1994.

He was a Technical Advisor with the Advanced Power System Division, Nortel Networks, in Ottawa, Canada from 1994 to 1999. Since 1999, he has been with Queen’s University, where he is currently a Professor with the Department of Electrical and Computer Engineering. His current research interests are listed as following:

  • How to best utilize the benefits of GaN and SiC devices to explore the full advantage of these devices so that small size and high-efficiency power converters can be designed.
  • Extremely high efficiency (>99%)  and extremely high power density (>2000W / inch3) DC-DC Bus converter for data center application
  • High power density LLC resonant converter for different power levels (from 65W to 4000W) for different applications (such as PD adapter, data center power, EV on-board DC-DC converter)
  • Digital Control technologies for accurate current sharing of multi-phase interleaved LLC resonant converter to achieve high efficiency and high power density simultaneously.
  • Digital control technology for fast dynamic response of DC-DC converters.
  • High efficiency, high power density AC to DC power converter for USB C Power Delivery (PD) application using GaN switches.
  • On-board EV DC-DC converter with high efficiency and high power density using GaN switches.
  • High power, high efficiency, and high power density single-phase AC–DC rectifier suitable for On-Board Chargers using GaN switches.

He has authored around 300 technical papers in the IEEE Transactions and conferences (View Dr. Liu’s Publications), and holds 68 U.S. patents (View Dr. Liu’s Patents). He has written a book on “High Frequency MOSFET Gate Drivers: Technologies and Applications”, published by IET. He is also a Principal Contributor for two IEEE standards. He received “Modeling and Control Achievement Award” from IEEE Power Electronics Society in 2017. He received Premier’s Research Excellence Award in 2000 in Ontario, Canada. He also received the Award of Excellence in Technology in Nortel in 1997.

Dr. Liu was the Vice President of Technical Operations of the IEEE Power Electronics Society (PELS, from 2017 to 2020). He was the general chair of ECCE 2019 held in Baltimore, USA in 2019, http://www.ieee-ecce.org/2019/). Dr. Liu serves as an Editor of the IEEE Journal of Emerging and Selected Topics of Power Electronics (IEEE JESTPE) since 2013. His other major service to IEEE is listed below: a Guest Editor-in-Chief for the special issue of Power Supply on Chip of IEEE Transactions on Power Electronics from 2011 to 2013; a Guest Editor for special issues of JESTPE: Miniaturization of Power Electronics Systems in 2014 and Green Power Supplies in 2016; as Co-General Chair of ECCE 2015 held in Montreal, Canada, in September 2015; the chair of PELS Technical Committee (TC1) on Control and Modeling Core Technologies from 2013 to 2016; chair of PELS Technical Committee (TC2) on Power Conversion Systems and Components from 2009 to 2012.