The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
권호 표지
DOI QR코드

DOI QR Code

High Frequency (MHz) LLC Resonant Converter for a Capacitor Coupling Wireless Power Transfer (CCWPT)

커패시터 커플링 무선 전력 전송을 위한 MHz LLC 공진형 컨버터

  • You, Young-Soo (Electronic Engineering, Graduate School, Daegu University) ;
  • Moon, HyunWon (School of Electronic and Electric Engineering, Daegu Univ.) ;
  • Yi, Kang-Hyun (School of Electronic and Electric Engineering, Daegu Univ.)
  • Received : 2015.10.12
  • Accepted : 2015.12.09
  • Published : 2016.04.20
Download PDF
⟨ Previous Next ⟩

Abstract

This paper proposes a high-frequency (MHz) LLC resonant converter for a capacitor coupling wireless power transfer (CCWPT). The CCWPT uses electric field in the coupling capacitor between the transmitter and receiver electrodes with a dielectric layer. Given that capacitance is very small and the impedance is large, transferring power with a simple series resonance is difficult. Therefore, the high frequency (MHz) and high Q factor LLC converter is proposed to reduce the impedance of the coupling capacitance and to obtain a high output voltage. This paper deals with the operation analysis of the proposed LLC converter and a theoretical capacitance estimation. The operation and features of the proposed CCWPT LLC converter is verified with a 4.2 W prototype for charging mobile devices.

Keywords

References

  1. R. Johari, J. V. Krogmeier, and D. J. Love, "Analysis and practical considerations in implementing multiple transmitters for wireless power transfer via coupled magnetic resonance," IEEE Trans. Ind. Electronics, Vol. 61, No. 4, pp. 1771-1783, Apr. 2014. https://doi.org/10.1109/TED.2014.2304452
  2. Z. N. Low, R. A. Chinga, R. Tseng, and J. Lin, "Compensate capacitor optimization for kilowatt-level magnetically resonant wireless charging system," IEEE Trans. Ind. Electronics, Vol. 61, No. 12, pp. 6758-6768, Dec. 2009. https://doi.org/10.1109/TIE.2014.2321349
  3. S. A. Mirbozorgi, H. Bahrami, M. Sawan, and B. Gosselin, "A smart multi coil inductively coupled array for wireless power transmission," IEEE Trans. Ind. Electronics, Vol. 61, No. 11, pp. 6061-6070, Nov. 2014. https://doi.org/10.1109/TIE.2014.2308138
  4. D. J. Ahn and S. C. Hong, "Optimal design of ICPT systems applied to electric vehicle battery charge," Proceeding of Annual KIPE Conference, pp. 623-624, July 2012.
  5. A. P. Hu, C. Liu, and H. L. Li, "A novel contactless battery charging system for soccer playing robot," in Proc. 15th IEEE Int. Conf. Mechatronics and Machine Vision in Practice, Auckland, New Zealand, pp. 646-650, 2008.
  6. A. Wahab, T. E. Chong, and L. K. Min, "Wireless pointing device using capacitive coupling," in Proc. 1997 IEEE Int. Symp. Consumer Electronics, Singapore, pp. 149-152, 1997.
  7. H. Kobayashi, H. Funato, and Y. Chiku, "Enhancement of transfer power of capacitive power transfer system using cascaded one pulse switching active capacitor(C-OPSAC) with three-level operation," in Power Electronics and Motion Control Conference (IPEMC), 2012 7th International, pp. 884-888, 2012.
  8. C. Liu, A. Hu, G. Covic, and N. C. Nair, "Comparative study of CCPT systems with two different inductor tuning positions," IEEE Trans. Power Electron., Vol. 27, No. 1, pp. 294-306, Jan. 2012. https://doi.org/10.1109/TPEL.2011.2158322
  9. C. Liu, A. Hu, B. Wang, and N. C. Nair, "A capacitively coupled contactless matrix charging platform with soft switched transformer control," IEEE Trans. Ind. Electron., Vol. 60, No. 1, pp. 249-260, Jan. 2013. https://doi.org/10.1109/TIE.2011.2172174
  10. J. Dai and D. C. Ludois, "Wireless electric vehicle charging via capacitive power transfer through a conformal bumper," in Proc. IEEE 30th Annu. Appl. Power Electron. Conf. Expo., 2015.
  11. H. William and H. HAYT, "Engineering Electromagnetic 5th edition," McGrawHill, 1989.
  12. K. H. Yi, "6.78MHz capacitive coupling wireless power transfer system," Journal of Power Electronics, Vol. 15, No. 4, pp. 987-993, July 2015. https://doi.org/10.6113/JPE.2015.15.4.987

Cited by

  1. Compact Drive Circuit for Capacitive Wireless Power Transfer System Utilizing Leakage-Enhanced Transformer vol.14, pp.1, 2019, https://doi.org/10.1007/s42835-018-00005-9