中国电气工程学报（英文） ›› 2020, Vol. 6 ›› Issue (4): 3-14.doi: 10.23919/CJEE.2020.000026

所属专题： Special Issue on Switched-Capacitor Circuits and Partial Processing Techniques

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  • 收稿日期:2020-09-20 修回日期:2020-11-15 接受日期:2020-12-04 出版日期:2020-12-25 发布日期:2021-01-15

A Novel Intermediate Bus Converter Topology for Cutting Edge Data Center Applications

Samuel Webb*, Yan-Fei Liu   

  1. Department of Electrical and Computer Engineering, Queen's University, Kingston K7L 3N6, Canada
  • Received:2020-09-20 Revised:2020-11-15 Accepted:2020-12-04 Online:2020-12-25 Published:2021-01-15
  • Contact: *E-mail: sam.webb@queensu.ca
  • About author:Samuel Webb is a PhD student at Queen’s University. He received his Bachelor’s degree from the Department of Electrical and Computer Engineering at Queen’s University in 2016, and began his graduate studies under Queen’s accelerated 4+1 program.Sam’s current research interests are primarily focused on extremely high efficiency DC-DC converter topologies, switched-capacitor topologies, and control techniques for these converters.Sam has authored several papers presented at both the ECCE and APEC conferences, receiving an Outstanding Presentation Award at APEC 2018. He has also served as the Chapter Chair for the IEEE-PELS Kingston chapter since 2019. Sam has been awarded scholarships under both the Ontario Graduate Scholarship Program, and the NSERC Postgraduate Scholarships – Doctoral Program.
    Yan-Fei 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 PhD 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 include optimal application of GaN and SiC devices to achieve small size and high efficiency power conversion, 99% efficiency power conversion with extremely high power density, digital control technologies for high efficiency, fast dynamic response dc-dc switching converter and ac-dc converter with power factor correction, resonant converters and server power supplies, and LED drivers. He has authored around 250 technical papers in the IEEE Transactions and conferences, and holds 35 U.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 is the vice president of Technical Operations of IEEE Power Electronics Society (PELS, from 2017 to 2020). Dr. Liu serves as an editor of IEEE Journal of Emerging and Selected Topics of Power Electronics (IEEE JESTPE) since 2013. He is the general chair of ECCE 2019 to be held in Baltimore, USA in 2019. His 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.AG3

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Abstract: As new technologies emerge data centers and servers have established themselves as one of the largest and fastest growing consumers of power. While switched capacitor converter topologies have some very attractive features, namely low reliance on magnetic components and high efficiency, several critical factors have prevented their adoption in high current data center applications. The family of converters proposed are novel intermediate bus converter that demonstrates the highest performance yet achieved for 48 V to 12 V conversion with up to 2.5 kW/in3 power density, higher than 99% peak efficiency, and 97.2% full load efficiency for 12 V/70 A output. The reduction of voltage stress across the MOSFETs as well as extremely low reliance on magnetics are the key driving factors behind this high efficiency and power density, and are achieved without a sensitive resonant design or the usage of complex control technique.

Key words: DC-DC converter, data centers, intermediate bus architecture