volume | PIER Journals

Abstract

The output power of a magnetic coupling resonance wireless power transfer (MCR-WPT) system attains the maximum value at two frequencies splitting in an over-coupled region. To achieve suitable transfer characteristics, impedance compensation methods have been used in MCR-WPT domain. In securingthe constant output power and transfer efficiency in a constant frequency mode, a topology of the MCR-WPT system with two transmitting coils is employed. First, the circuit model is designed while evaluating the transmission characteristics. Second, when the two transmitting coils are placed into the transmitting loop, the main transmitter and sub-transmitter loops are created by sharing the same transmitter. The use of two transmitting coils to achieve a magnetic field superposition is investigated. Constant output power and transfer efficiency are then investigated in a constant frequency mode.Finally, the experimental equipment is designed. Experimental results confirm the effectiveness and robustness of the topology. Such a topology can be optimized for the transfer performance by itself and can achieve constant output power and transfer efficiency.If the distance between the two transmitting coils is appropriate and the receiving coil moves between the two transmitting coils, the fluctuation of the output power and transfer efficiency of the MCR-WPT system is less than 5%.

1. Tesla, N., "Electrical energy,", U.S. Patent 1,119,732, Dec. 1, 1914.
doi:10.1109/MPEL.2016.2583839 Google Scholar

2. Bosshard, R. and J. W. Kolar, "Inductive power transfer for electric vehicle charging: Technical challenges and tradeoffs," IEEE Power Electronics Magazine, Vol. 3, 22, 2016.
doi:10.1109/TIE.2007.904025 Google Scholar

3. Covic, G. A., J. T. Boys, M. L. G. Kissin, et al. "A three-phase inductive power transfer system for roadway-powered vehicles," IEEE Transactions on Industrial Electronics, Vol. 54, 3370, 2007.
doi:10.1049/el.2016.1253 Google Scholar

4. Ishihara, M., K. Umetani, H. Umegami, et al. "Quasi-duality between SS and SP topologies of basic electric-field coupling wireless power transfer system," Electronics Letters, Vol. 52, 2057, 2016.
doi:10.1109/LAWP.2014.2328375 Google Scholar

5. Al-Kalbani, A. I., M. R. Yuce, and J. M. Redoute, "A biosafety comparison between capacitive and inductive coupling in biomedical implants," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 1168, 2014.
doi:10.1126/science.1143254 Google Scholar

6. AndréKurs, K. A., R. Moffatt, et al. "Wireless power transfer via strongly coupled magnetic resonances," Science, Vol. 317, 83, 2007.
doi:10.1109/TIE.2010.2046002 Google Scholar

7. Sample, A. P., D. T. Meyer, and J. R. Smith, "Experimental results, and range adaptation of magnetically coupled resonators for wireless power transfer," IEEE Transactions on Industrial Electronics, Vol. 58, 544, 2011.
doi:10.1109/TMTT.1984.1132833 Google Scholar

8. Brown, W. C., "The history of power transmission by radio waves," IEEE Transactions on Microwave Theory Techniques, Vol. 32, 1230, 1984.
doi:10.1016/j.aop.2007.04.017 Google Scholar

9. Karalis, A., J. D. Joannopoulos, and M. Soljačić, "Efficient wireless non-radiative mid-range energy transfer," Annals of Physics, Vol. 323, 34, 2006.
doi:10.1109/TPEL.2013.2249670 Google Scholar

10. Hui, S. Y. R., W. Zhong, and C. K. Lee, "A critical review of recent progress in mid-range wireless power transfer," IEEE Transactions on Power Electronics, Vol. 29, 4500, 2014.
doi:10.1063/1.4999615 Google Scholar

11. Liu, S., J. Tan, and X. Wen, "Modeling of coupling mechanism of wireless power transfer system and vibration phenomenon of receiver-coil in three-coil system," AIP Advances, Vol. 7, 115107, 2017.
doi:10.2528/PIERM18061404 Google Scholar

12. Liu, S. and J. Tan, "Study on the vibration mechanism of the relay coil in a three-coil WPT system," Progress In Electromagnetics Research M, Vol. 70, 117-126, 2018. Google Scholar

13. Huang, R., B. Zhang, D. Qiu, et al. "Frequency splitting phenomena of magnetic resonant coupling wireless power transfer," IEEE Transactions on Magnetics, Vol. 50, 1, 2014.
doi:10.1109/LAWP.2014.2333418 Google Scholar

14. Lee, J., Y. Lim, H. Ahn, et al. "Impedance-matched wireless power transfer systems using an arbitrary number of coils with flexible coil positioning," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 1207, 2014.
doi:10.3390/en10050688 Google Scholar

15. Xiao, C., "New insight of maximum transferred power by matching capacitance of a wireless power transfer system," Energies, Vol. 10, 688, 2017.
doi:10.1163/156939310792149795 Google Scholar

16. Peng, L., O. Breinbjerg, and N. A. Mortensen, "Wireless energy transfer through non-resonant magnetic coupling," Journal of Electromagnetic Waves and Applications, Vol. 24, 1587, 2010.
doi:10.1163/156939311794827186 Google Scholar

17. Peng, L., J. Y. Wang, L. X. Ran, et al. "Performance analysis and experimental verification of mid-range wireless energy transfer through non-resonant magnetic coupling," Journal of Electromagnetic Waves and Applications, Vol. 25, 845, 2011.
doi:10.3390/en11082032 Google Scholar

18. Luo, Y., Y. Yang, X. Wen, et al. "Enhancing the robustness of the wireless power transfer system to uncertain parameter variations using an interval-based uncertain optimization method," Energies, Vol. 11, 2032, 2018.
doi:10.1063/1.5012272 Google Scholar

19. Liu, S., J. Tan, and X. Wen, "Dynamic impedance compensation for wireless power transfer using conjugate power," AIP Advances, Vol. 8, 025210, 2018.
doi:10.1108/CW-04-2018-0022 Google Scholar

20. Liu, S. and J. Tan, "Dynamic impedance compensation forWPT using a compensator in a three-coil wireless power transfer system," Circuit World, Vol. 44, No. 4, 171, 2018. Google Scholar

21. Biot-Savart law, https://en.wikipedia.org/wiki/BiotSavart_law.

22. Helmholtz coil, https://en.wikipedia.org/wiki/Helmholtz_coil.

Dr. Suqi Liu

Dr. Jianping Tan

Dr. Yuping Liu