Research Article

A Solution to Frequency Splitting in Magnetic Resonance Wireless Power Transfer Systems Using Double Sided Symmetric Capacitors

Thabat Thabet
Northern Technical University, Iraq
* Corresponding author
John Woods
Essex University, UK
DOI icon 10.24018/ejece.2021.5.2.305

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Submitted 2021-02-20
Published 2021-03-20

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Article Main Content

The technology of wireless power transfer using magnetic resonance coupling has become a subject of interest for researchers with the proliferation of mobile. The maximum efficiency is achieved at a specific gap between the resonators in the system. However, the resonance frequency splits as the gap declines or gets smaller. Different methods have been studied to improve this such as frequency tracking and impedance matching, including capacitive tuning. However, the system has to maintain the same working frequency to avoid moving out of the license exempt industrial, scientific, and medical (ISM) band; and the efficiency must be as large as possible. In this paper, a symmetric capacitance tuning method is presented to achieve these two conditions and solve the splitting problem. In the proposed method, the maximum efficiency at one of the splitting frequencies is moved to match the original resonance frequency. By comparison to other works, both simulation and experiment show considerable improvements for the proposed method over existing frequency tracking and impedance matching methods. The paper also presents a proposal to apply this method automatically which can achieve wireless charging for electronic applications with high efficiency and through variable distance.

Keywords: Frequency splitting; frequency tracking; impedance matching (IM); magnetic coupling; maximum efficiency; mutual inductance; resonance frequency; symmetric capacitance tuning (SCT); wireless power transfer (WPT)

References

  1. W. Zhou, S. Sandeep, P. Wu, P. Yang, W. Yu, and S. Y. Huang, ?A Wideband Strongly Coupled Magnetic Resonance Wireless Power Transfer System and Its Circuit Analysis,? IEEE Microwave and Wireless Components Letters, vol. 28, issue 12, 2018.
     Google Scholar
  2. Y. Zhang, Z. Zhao, and K. Chen, ?Frequency-Splitting Analysis of Four-Coil Resonant Wireless Power Transfer,? Industry Applications, IEEE Transactions on, vol. 50, no. 4, pp. 2436-2445, 2014
     Google Scholar
  3. J. Gozalvez, ?WiTricity-the wireless power transfer [Mobile radio],? Vehicular Technology Magazine, IEEE, vol. 2, no. 2, pp. 38-44, 2007.
     Google Scholar
  4. X. Wang, Y. Wang, G. Fan, Y. Hu, X. Nie, and Z. Yan, ?Experimental and Numerical Study of a Magnetic Resonance Wireless Power Transfer System Using Superconductor and Ferromagnetic Metamaterials,? IEEE Transactions on Applied Superconductivity, vol. 28, issue 5, 2018.
     Google Scholar
  5. T. Imura, and Y. Hori, ?Maximizing air gap and efficiency of magnetic resonant coupling for wireless power transfer using equivalent circuit and neumann formula,? Industrial Electronics, IEEE Transactions on, vol. 58, no. 10, pp. 4746-4752, 2011.
     Google Scholar
  6. N. P. Cook, P. Meier, L. Sieber, M. Secall, and H. Widmer, "Wireless energy transfer using coupled antennas," Google Patents, US9634730B2, 2017.
     Google Scholar
  7. D. Xu, Q. Zhang, and X. Li, "Implantable Magnetic Resonance Wireless Power Transfer System Based on 3D Flexible Coils," Sustainability, vol. 12, issue 10, 2020.
     Google Scholar
  8. T. Thabet, and J. Woods, "Impact of connection type on the efficiency of wireless power transfer systems." IEEE International Conference on Circuits, System and Simulation (ICCSS), pp. 146-150, 2017.
     Google Scholar
  9. Y. Zhaksylyk, U. Hanke, M. Azadmehr, "Impedance Matching using Interspiraled Coils for Wireless Power Transfer," IEEE Xplore, 2020.
     Google Scholar
  10. Department of Physics and Astronomy: Georgia State University; "Mutual Inductance," 2017, [Online]. Available: http://hyperphysics.phyastr.gsu.edu/hbase/magnetic/indmut.html
     Google Scholar
  11. T. Imura, and Y. Hori, ?Maximizing air gap and efficiency of magnetic resonant coupling for wireless power transfer using equivalent circuit and neumann formula,? Industrial Electronics, IEEE Transactions on, vol. 58, no. 10, pp. 4746-4752, 2011.
     Google Scholar
  12. A. C. M. de Queiroz, ?Mutual inductance and inductance calculations by Maxwell?s Method,? Home page of Dr. Antonio Carlos M. de Queiroz, 2005.
     Google Scholar
  13. T. I. Anowar, S. D. Barman, A. Wasif Reza, and N. Kumar, ?High-efficiency resonant coupled wireless power transfer via tunable impedance matching,? International Journal of Electronics, vol. 104, no. 10, pp. 1-19, 2017.
     Google Scholar
  14. B. H. Waters, A. P. Sample, and J. R. Smith, "Adaptive impedance matching for magnetically coupled resonators." PIERS Proceedings, Moscow, pp. 694- 701, 2012.
     Google Scholar
  15. T. C. Beh, M. Kato, T. Imura, S. Oh, and Y. Hori, ?Automated impedance matching system for robust wireless power transfer via magnetic resonance coupling,? Industrial Electronics, IEEE Transactions on, vol. 60, no. 9, pp. 3689-3698, 2013.
     Google Scholar
  16. A. P. Sample, D. T. Meyer, and J. R. Smith, ?Analysis, experimental results, and range adaptation of magnetically coupled resonators for wireless power transfer,? IEEE Transactions on Industrial Electronics, vol. 58, no. 2, pp. 544-554, 2011.
     Google Scholar
  17. H. Li, X. Yang, K. Wang, and X. Dong, "Study on efficiency maximization design principles for Wireless Power Transfer system using magnetic resonant coupling." IEEE ECCE Asia Downunder (ECCE Asia), pp. 888-892, 2013.
     Google Scholar
  18. J. Lee, Y. Lim, H. Ahn, J.-D. Yu, and S.-O. Lim, ?Impedance-matched wireless power transfer systems using an arbitrary number of coils with flexible coil positioning,? IEEE Antennas and Wireless Propagation Letters, vol. 13, pp. 1207-1210, 2014.
     Google Scholar
  19. X. Tao, C. Rong, C. Lu, X. Huang, Y. Zeng, Z. Hu, and M. Liu, ?A Novel Approach to Reach Impedance Matching in Wireless Power Transfer Systems,? Applied Sciences, vol. 9, issue 5, 2019.
     Google Scholar
  20. T. Beh, M. Kato, T. Imura, and Y. Hori, ?Wireless Power Transfer System via Magnetic Resonant Coupling at Fixed Resonance Frequency?Power Transfer System Based on Impedance Matching?,? EVS-25 Shenzhen, China, 2010.
     Google Scholar
  21. W. Fu, B. Zhang, and D. Qiu, "Study on frequency-tracking wireless power transfer system by resonant coupling." IEEE 6th International Conference of Power Electronics and Motion Control, pp. 2658-2663, 2009.
     Google Scholar
  22. N. Y. Kim, K. Y. Kim, Y.-H. Ryu, J. Choi, D.-Z. Kim, C. Yoon, Y.-K. Park, and S. Kwon, "Automated adaptive frequency tracking system for efficient mid-range wireless power transfer via magnetic resonanc coupling." 42nd European Microwave Conference (EuMC), pp. 221-224, 2012.
     Google Scholar
  23. J. Kim, D.-H. Kim, and Y.-J. Park, ?Free-Positioning Wireless Power Transfer to Multiple Devices Using a Planar Transmitting Coil and Switchable Impedance Matching Networks,? IEEE Transactions on Microwave Theory and Techniques, vol. 64, no. 11, 2016.
     Google Scholar
  24. Radio Regulations, ?International Telecommunication Union,? Radiocommunication Sector. ITU-R. Geneva, 2008.
     Google Scholar