To improve the power transfer efficiency in a magnetically-coupled resonant wireless power transfer (MCR-WPT) system, an efficient particle swarm optimization (PSO) algorithm based on the change of particle swarm scale is proposed. The transfer efficiency and frequency are used as the fitness function and particle position, respectively. Therefore, the optimal frequency can be obtained by adjusting the position of particle. Five types of optimizing process are presented and compared with the traditional PSO algorithm. It is found that the proposed method has faster convergence speed than the traditional PSO algorithm. Additionally, the proposed five types of optimizing process with different regulation parameters are investigated. The results indicate that Type 2 with n=3 is the best alternative in finding the optimal frequency with the fastest speed of convergence. Experimental prototypes have been set up for validation.
2. Liu, X. C. and G. F. Wang, "A novel wireless power transfer system with double intermediate resonant coils," IEEE Trans. Ind. Electron., Vol. 63, No. 4, 2174-2180, 2016.
3. Sample, A., D. Meyer, and J. Smith, "Analysis, experimental results, and range adaptation of magnetically coupled resonators for wireless power transfer," IEEE Trans. Ind. Electron., Vol. 58, No. 2, 544-554, 2011.
4. Fu, M., T. Zhang, C. Ma, and X. Zhu, "Efficiency and optimal loads analysis for multiple-receiver wireless power transfer systems," IEEE Trans. Microw. Theory Techn., Vol. 63, No. 3, 801-812, 2015.
5. Na, K., H. Jang, H. Ma, and F. Bien, "Tracking optimal efficiency of magnetic resonance wireless power transfer system for biomedical capsule endoscopy," IEEE Trans. Microw. Theory Tech., Vol. 63, No. 1, 295-304, 2015.
6. Mi, C. C., G. Buja, Y. C. Su, and C. T. Rim, "Modern advances in wireless power transfer systems for roadway powered electric vehicles," IEEE Trans. Ind. Electron., Vol. 63, No. 10, 6533-6545, 2016.
7. Talla, V. and J. Smith, "An experimental technique for design of practical wireless power transfer systems," IEEE Int. Circuits Syst. Symp., 2041-2044, 2014.
8. Johari, R., 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. Electron., Vol. 64, No. 4, 1774-1783, 2014.
9. Wang, J., S. L. Ho, W. Fu, C. T. Kit, and M. Sun, "Finite-element analysis and corresponding experiments of resonant energy transfer for wireless transmission devices," IEEE Trans. Magnetics, Vol. 47, No. 5, 1074-1077, 2011.
10. Lyu, Y. L., F. Y. Meng, G. H. Yang, B. J. Che, Q. Wu, L. Sun, D. Erni, and J. L.-W. Lee, "A method of using nonidentical resonant coils for frequency splitting elimination in wireless power transfer," IEEE Trans. Power Electron., Vol. 30, No. 11, 6097-6107, 2015.
11. Zhang, Y. M. and Z. M. Zhao, "Frequency splitting analysis of two-coil resonant wireless power transfer," IEEE Ant. Wireless Propag. Lett., Vol. 13, No. 4, 400-402, 2014.
12. Zhang, Y. M., Z. M. Zhao, and K. Chen, "Frequency splitting analysis of four-coil resonant wireless power transfer," IEEE Trans. Ind. Appl., Vol. 50, No. 4, 2436-2445, 2014.
13. Lan, J., H. Tang, and G. Xin, "Frequency splitting analysis of wireless power transfer system based on T-type transformer model," Electron. Electrical Eng., Vol. 19, No. 10, 109-113, 2013.
14. 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 Trans. Ind. Electron., Vol. 58, No. 2, 544-554, 2011.
15. Kim, Kim, D. H. Kim, and Y. J. Park, "Analysis of capacitive impedance matching networks for simultaneous wireless power transfer to multiple devices," IEEE Trans. Ind. Electron., Vol. 62, No. 5, 2807-2813, 2015.
16. Fu, M., H. Yin, X. Zhu, and C. Ma, "Analysis and tracking of optimal load in wireless power transfer systems," IEEE Trans. Power Electron., Vol. 30, No. 7, 3952-3963, 2015.
17. Vasilev, I., J. Lindstrand, V. Plicanic, and H. Sjoland, "Experimental investigation of adaptive impedance matching for a MIMO terminal with CMOS-SOI tuners," IEEE Trans. Micro. Theory Tech., Vol. 64, No. 5, 1622-1622, 2016.
18. Koh, K. E., T. C. Beh, T. Imura, and Y. Hori, "Impedance matching and power division using impedance inverter for wireless power transfer via magnetic resonant coupling," IEEE Trans. Ind. App., Vol. 50, No. 3, 2061-2070, 2014.
19. Heebl, J. D., E. M. Thomas, R. P. Pennoand A. Grbic, "Comprehensive analysis and measurement of frequency-tuned and impedance-tuned wireless non-radiative power-transfer systems," IEEE Antennas Propag. Mag., Vol. 56, No. 4, 44-60, 2014.
20. Lee, W. S., W. I. Son, K. S. Oh, and J. W. Yu, "Contactless energy transfer systems using antiparallel resonant loops," IEEE Trans. Ind. Electron., Vol. 61, No. 1, 350-359, 2013.
21. Li, H., H. Zhang, C. Zhang, P. Li, and R. Cropp, "A novel unsupervised levy flight particle swarm optimization (ULPSO) method for multispectral remote-sensing image classification," International Journal of Remote Sensing, Vol. 38, No. 23, 6970-6992, 2017.
22. Jabri, I., A. Bouallegue, and F. Ghodbane, "Misalignment controller in wireless battery charger for electric vehicle based on MPPT method and metaheuristic algorithm," Wireless Netw., Vol. 10, 1-22, 2017.
23. Schuetz, M., A. Georgiadis, A. Collado, and G Fischer, "A particle swarm optimizer for tuning a software-defined, highly configurable wireless power transfer platform," Wireless Power Transfer Conference, 1-24, 2015.
24. Hu, H. and S. V. Georgakopoulos, "Multiband and broadband wireless power transfer systems using the conformal strongly coupled magnetic resonance method," IEEE Trans. Ind. Electron., Vol. 64, No. 5, 3595-3607, 2017.
25. Wang, M., J. Feng, Y. Fan, M. Shen, J. Liang, and Y. Shi, "A novel planar wireless power transfer system with distance-insensitive characteristics," Progress In Electromagnetics Research Lett., Vol. 75, 13-19, 2018.