Accomplishing high efficiency with acceptable output load power is a formidable design challenge in resonant wireless power transfer (WPT) system employed for charging Electric Vehicle (EV). This necessitates a trade-off among the assorted parameters like coil quality factor, coupling coefficient and electric load for performance enrichment of resonant WPT system. It is realized that the high value of quality factor does not ensure higher power transfer efficiency but it is largely influenced by the electric load. For each coupling coefficient there exists an optimum load for which maximum power can be delivered. It is also perceived that for a fixed vertical separation gap of the coils, increasing receiver coil quality factor has no profound effect on the output load power as well as efficiency. The circuit model based analytical results agree well with the comprehensive experimental results and elucidate the strategic design guidelines for a competent wireless electric vehicle charging system.
1. Kiani, M., U. Jow, and M. Ghovanloo, "Design and optimization of a 3-coil inductive link for efficient wireless power transmission," IEEE Transactions on Biomedical Circuits and Systems, Vol. 5, No. 6, 579-591, 2011. doi:10.1109/TBCAS.2011.2158431
2. Sergeant, P. and A. Van den Bossche, "Inductive coupler for contactless power transmission," IET Electr. Power Appl., Vol. 2, No. 1, 1-7, 2008. doi:10.1049/iet-epa:20070059
3. Elliot, G., G. Covic, D. Kacprzak, and J. T. Boys, "A new concept: Asymmetrically pick-ups for inductively coupled power transfer monorail systems," IEEE Trans. Magn., Vol. 42, No. 10, 3389-3391, 2006. doi:10.1109/TMAG.2006.879619
4. Li, S. and C. C. Mi, "Wireless power transfer for electric vehicle applications," IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 3, No. 1, 4-17, 2015. doi:10.1109/JESTPE.2014.2319453
5. Hasanzadeh, S. and S. Vaez-Zadeh, "Design of a wireless power transfer system for high power moving applications," Progress In Electromagnetics Research M, Vol. 28, 258-271, 2013. doi:10.2528/PIERM12102210
6. Deng, B., B. Jia, and Z. Zhang, "Dynamic wireless charging for roadway-powered electric vehicles: A comprehensive analysis and design," Progress In Electromagnetics Research C, Vol. 69, 1-10, 2016. doi:10.2528/PIERC16071106
7. Kurs, A., A. Karalis, R. Moffatt, J. D. Joannopoulos, P. Fisher, and M. Soljacic, "Wireless power transfer via strong coupled magnetic resonances," Sci. Express, Vol. 317, No. 5834, 83-86, 2007.
8. Bou, E., E. Alarcon, and J. Gutierrez, "A comparison of analytical models for resonant inductive coupling wireless power transfer," PIERS Proceedings, 689-693, Moscow, Russia, August 19–23, 2012.
9. Sample, A. P., D. A. 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, 544-554, 2011. doi:10.1109/TIE.2010.2046002
10. Low, Z. N., R. A. Chinga, R. Tseng, and J. Lin, "Design and test of a high-power high-efficiency loosely coupled planar wireless power transfer system," IEEE Transactions on Industrial Electronics, Vol. 56, No. 5, 1801-1812, 2009. doi:10.1109/TIE.2008.2010110
11. Jow, U. M. and M. Ghovanloo, "Design and optimization of printed spiral coils for efficient transcutaneous inductive power transmission," IEEE Trans. Biomed. Circuits Syst., Vol. 1, No. 3, 193-202, 2007. doi:10.1109/TBCAS.2007.913130
12. Hui, S. and W. Ho, "A new generation of universal contactless battery charging platform for portable consumer electronic equipment," IEEE Trans. Power Electron., Vol. 20, No. 3, 620-627, 2005. doi:10.1109/TPEL.2005.846550
13. Rotaru, M. D., R. Tanzania, R. Ayoob, T. Y. Kheng, and J. K. Sykulski, "Numerical and experimental study of the effects of load and distance variation on wireless power transfer systems using magnetically coupled resonators," IET Sci. Meas. Technol., Vol. 9, No. 2, 160-171, 2015. doi:10.1049/iet-smt.2014.0175
14. Nicoli, P. P., A. R. Esteva, and F. Silveira, "Bidirectional analysis and design of RFID using an additional resonant coil to enhance read range," IEEE Transactions on Microwave Theory and Techniques, Vol. 64, No. 7, 2357-2367, 2016. doi:10.1109/TMTT.2016.2573275
15. Li, X., X. Dai, Y. Li, Y. Sun, Z. Ye, and Z. Wang, "Coupling coefficient identification for maximum power transfer in WPT system via impedance matching," IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW), 2016.
16. Mai, R., Y. Liu, Y. Li, P. Yue, G. Cao, and Z. He, "An active-rectifier-based maximum efficiency tracking method using an additional measurement coil for wireless power transfer," IEEE Transactions on Power Electronics, Vol. 33, No. 1, 716-728, 2018. doi:10.1109/TPEL.2017.2665040
17. Barzegaran, M. R., H. Zargarzadeh, and O. A. Mohammed, "Wireless power transfer for electric vehicle using an adaptive robot," IEEE Transactions on Magnetics, Vol. 53, No. 6, 2017. doi:10.1109/TMAG.2017.2664800
18. Zhang, X., H. Meng, B. Wei, S. Wang, and Q. Yang, "Mutual inductance calculation for coils with misalignment in wireless power transfer," The Journal of Engineering, 16, 2019.
19. Li, J., Q. Deng, W. Hu, and H. Zhu, "Research on quality factor of the coils in wireless power transfer system based on magnetic coupling resonance," IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW), 123-127, 2017.