CJEE

Chinese Journal of Electrical Engineering ›› 2020, Vol. 6 ›› Issue (4): 28-41.doi: 10.23919/CJEE.2020.000028

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

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Flying Capacitor Design Considerations for a 48-to-12 V, 35 A Split-phase Dickson SC Converter

RichardSun*, Samuel Webb, Yan-Fei Liu   

  1. Department of Electrical and Computer Engineering, Queen's University, Kingston K7L 3N6, Canada
  • Received:2020-09-18 Revised:2020-11-14 Accepted:2020-11-19 Online:2020-12-25 Published:2021-01-15
  • Contact: *E-mail: sun.richard@queensu.ca
  • About author:Richard(Yue) Sun received his BASc. degree in electrical engineering from Queen’s University in Kingston, Ontario, Canada in 2019. He is currently working towards his MASc. degree at the Queen’s Power Research Group at Queen’s University in Kingston, Ontario, Canada. His current research conprises of the design and optimization of switched-capacitor converters for high current applications.
    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 degrees 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 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 hold 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 2018). 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 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.

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Abstract: Switched-capacitor converters can deliver better performance, power density, and switch utilization compared to inductor-based power converters, but they suffer from current spikes during switching due to capacitor charge redistribution. This can be solved by methods such as split-phase control, which was developed to address charge redistribution in Dickson SC converters by controlling the charging and discharging of the circuit's flying capacitors, such that the equivalent branch voltages line up when the circuit switches states. However, split-phase control is most effective at compensating for charge redistribution when all the circuit's flying capacitors are matched in capacitance value. Differences between the capacitance values of the circuit flying capacitors may result in split-phase control not being able to fully compensate for charge redistribution, due to the different charge/discharge rates of the flying capacitors. The work presented in this paper provides an in-depth analysis of the sensitivity of the split-phase Dickson converter to mismatches in flying capacitor values, as well as discussions regarding the design considerations and prototype test results of a split-phase Dickson converter for high-current loads.

Key words: Switched-capacitor converter, Dickson converter, split-phase control, capacitor mismatch