DOI QR코드

DOI QR Code

Design Guidelines for a Capacitive Wireless Power Transfer System with Input/Output Matching Transformers

  • Choi, Sung-Jin (School of Electrical Engineering, University of Ulsan)
  • 투고 : 2015.10.28
  • 심사 : 2016.06.08
  • 발행 : 2016.11.01

초록

A capacitive wireless power transfer (C-WPT) system uses an electric field to transmit power through a physical isolation barrier which forms a pair of ac link capacitors between the metal plates. However, the physical dimension and low dielectric constant of the interface medium severely limit the effective link capacitance to a level comparable to the main switch output capacitance of the transmitting circuit, which thus narrows the soft-switching range in the light load condition. Moreover, by fundamental limit analysis, it can be proved that such a low link capacitance increases operating frequency and capacitor voltage stress in the full load condition. In order to handle these problems, this paper investigates optimal design of double matching transformer networks for C-WPT. Using mathematical analysis with fundamental harmonic approximation, a design guideline is presented to avoid unnecessarily high frequency operation, to suppress the voltage stress on the link capacitors, and to achieve wide ZVS range even with low link capacitance. Simulation and hardware implementation are performed on a 5-W prototype system equipped with a 256-pF link capacitance and a 200-pF switch output capacitance. Results show that the proposed scheme ensures zero-voltage-switching from full load to 10% load, and the switching frequency and the link capacitor voltage stress are kept below 250 kHz and 452 V, respectively, in the full load condition.

키워드

참고문헌

  1. C. Liu, A. P. Hu, and N. K. C. Nair, "Modelling and analysis of a capacitively coupled contactless power transfer system," IET Power Electronics, vo1. 4, no. 7, pp. 808-815, 2011.
  2. M. Kline, I. Izyumin, B. Boser, and S. Sanders, "Capacitive power transfer for contactless charging," IEEE Applied Power Electronics Conference and Exposition, pp. 1398-1404, 2011.
  3. J. A. Sabate, R. W. Farrington, M. M. Jovanovic, and F. C. Lee, "Effect of FET Output Capacitance on ZVS of Resonant Converters," IEEE Transactions on Aerospace and Electronic Systems, Vol. 32, No. 1, pp. 255-266, Jan. 1996. https://doi.org/10.1109/7.481267
  4. M. P. Theodoridis, "Effective Capacitive Power Transfer," IEEE Transactions on Power Electronics, Vol. 27, No. 12, pp. 4906-4913, Dec. 2012. https://doi.org/10.1109/TPEL.2012.2192502
  5. J. Dai and D. Ludois, "Single active switch power electronics for kilowatt scale capacitive power transfer," IEEE J. Emerg. Sel. Topics Power Electron., vol. 3, no. 1, pp. 315-323, Mar. 2015. https://doi.org/10.1109/JESTPE.2014.2334621
  6. F. Lu, H. Zhang, H. Hofmann, and C. Mi, "A Double-Sided LCLC-Compensated Capacitive Power Transfer System for Electric Vehicle Charging," IEEE Transactions On Power Electronics, vol. 30, no. 11, pp. 6011-6014, Nov. 2015. https://doi.org/10.1109/TPEL.2015.2446891
  7. Japanese Patent P2013-187963A.
  8. B.-W. Choi, and S.-J. Choi, "Design of capacitively - coupled contactless charging system using class-E amplifier," Korean Institute of Power Electronics Conference, pp. 173-174, Jul. 2013.
  9. S.-J. Choi, S.-Y. Kim, and B.-W. Choi, "Power stage design for a surface wireless power transmission system using a coupled electric field," Journal of Institute of Control, Robotics and Systems, Vol. 20, No. 2, pp. 143-148, 2014. https://doi.org/10.5302/J.ICROS.2014.13.9007
  10. R. L. Steigerwald, "A comparison of half-bridge resonant converter topologies," IEEE Transactions on Power Electronics, vol. 3, no. 2, pp. 174-182, Apr. 1988. https://doi.org/10.1109/63.4347
  11. D. C. Ludois, J. K. Reed, and K. Hanson, "Capacitive power transfer for rotor field current in synchronous machines," IEEE Trans. Power Electron., vol. 27, no. 11, pp. 4638-4645, Nov. 2012. https://doi.org/10.1109/TPEL.2012.2191160
  12. D. C. Ludois, M. J. Erickson, and J. K. Reed, "Aerodynamic fluid bearings for translational and rotating capacitors in noncontact capacitive power transfer systems," IEEE Trans. Ind. Appl., vol. 50, no. 2, pp. 1025-1033, Mar./Apr. 2014. https://doi.org/10.1109/TIA.2013.2273484
  13. J. Dai and D. C. Ludois, "A Survey of Wireless Power Transfer and a Critical Comparison of Inductive and Capacitive Coupling for Small Gap Applications," IEEE Transactions On Power Electronics, vol. 30, no. 11, pp. 6017-6029, Nov. 2015. https://doi.org/10.1109/TPEL.2015.2415253

피인용 문헌

  1. LC–CLC compensation topology for capacitive power transfer system to improve misalignment performance pp.1755-4543, 2018, https://doi.org/10.1049/iet-pel.2018.5606