Last decade has witnessed dramatic advancements in wireless charging distance of magnetic resonant coupling wireless power transfer (MRCWPT) for various portable electronic devices. Driven by the demand of cost-effective and compact system working for multiple receivers, a novel omnidirectional MRCWPT system with a single wire wound spiral transmitter and a single power source is proposed in this work. Besides, an equivalent circuit model is established to derive the power transfer efficiency (PTE) of this novel MRCWPT system. Finite element simulation results have shown that the magnetic field distribution for the proposed model is uniform in all directions. And the PTE of the system depending on the distance between the transmitter and receivers is demonstrated to be independent of the receiving angles. Finally, the theoretical analysis of the simulation results is verified by practical experimental results, which shows that the PTE of the system reaches 60% at the distance of 160 mm and the resonant frequency of 15.5 MHz.
2. Basar, M. R., M. Y. Ahmadm, J. Cho, and F. Ibrahim, "Stable and high efficiency wireless power transfer system for robotic capsule using a modified Helmholtz coil," IEEE Trans. Ind. Electron., Vol. 64, No. 2, 1113-1122, Feb. 2017.
3. Yedavalli, P. S., T. Riihonen, X. Wang, and J. M. Rabaey, "Far-field RF wireless power transfer with blind adaptive beam forming for Internet of Things devices," IEEE Access, Vol. 5, 1743-1752, 2017.
4. Zhang, C. and Y. Chen, "Wireless power transfer strategies for cooperative relay system to maximize information throughput," IEEE Access, Vol. 5, 2573-2582, 2017.
5. Li, Y., L. Zhang, T. Zhao, and L. Zou, "The electromagnetic compatibility analysis of experimental apparatus based on wireless power transmission," IEEE Industrial Electronics & Applications, 2334-2338, Jun. 2016.
6. Li, C. J. and H. Ling, "Investigation of wireless power transfer using planarized, capacitor-loaded coupled loops," Progress In Electromagnetics Research, Vol. 148, 223-231, 2014.
7. Fan, Y., L. Li, S. Yu, C. Zhu, and C.-H. Liang, "Experimental study of efficient wireless power transfer system integrating with highly sub-wavelength metamaterials," Progress In Electromagnetics Research, Vol. 141, 769-784, 2013.
8. El Badawe, M. and O. M. Ramah, "Efficient metasurface rectenna for electromagnetic wireless power transfer and energy harvesting," Progress In Electromagnetics Research, Vol. 161, 35-40, 2018.
9. Robichaud, A., M. Boudreault, and D. Deslandes, "Theoretical analysis of resonant wireless power transmission links composed of electrically small loops," Progress In Electromagnetics Research, Vol. 143, 485-501, 2013.
10. Jang, B.-J., S. Lee, and H. Yoon, "HF-band wireless power transfer system: Concept, issues, and design," Progress In Electromagnetics Research, Vol. 124, 211-231, 2012.
11. Park, S. I., "Ehancement of wireless power transmission into biological tissues using a high surface impedance ground plane," Progress In Electromagnetics Research, Vol. 135, 123-136, 2013.
12. Liu, T., X. Wang, and L. Zheng, "A cooperative SWIPT scheme for wirelessly powered sensor networks," IEEE Trans. Commun., Vol. 65, No. 6, 2740-2752, Jun. 2017.
13. Mai, V. V., W.-Y. Shin, and K. Ishibashi, "Wireless power transfer for distributed estimation in sensor networks," IEEE J. Sel. Topics Signal Process., Vol. 11, No. 3, 549-562, Apr. 2017.
14. Kim, J.-M., M. Han, and H. Sohn, "Magnetic resonance-based wireless power transmission through concrete structures," J. Electromagn. Eng. Sci., Vol. 15, No. 2, 104-110, Apr. 2015.
15. Duong, T. P. and J. W. Lee, "Experimental results of high-efficiency resonant coupling wireless power transfer using a variable coupling method," IEEE Microw. Wireless Compon. Lett., Vol. 21, No. 8, 442-444, Aug. 2011.
16. Guan, M., K. Wang, D. Xu, and W.-H. Liao, "Design and experimental investigation of a low-voltage thermoelectric energy harvesting system for wireless sensor nodes," Energy Convers. Manage., Vol. 138, 30-37, Apr. 2017.
17. Caffrey, C. M., T. Sillanpaa, H. Huovila, J. Nikunen, S. Hakulinen, and P. Pursula, "Energy autonomous wireless valve leakage monitoring system with acoustic emission sensor," IEEE Trans. Circuits Syst. I, Reg. Papers, Vol. 64, No. 11, 2884-2893, Nov. 2017.
18. Ahn, D. and S. Hong, "Effect of coupling between multiple transmitters or multiple receivers on wireless power transfer," IEEE Trans. Ind. Electron., Vol. 60, No. 7, 2602-2613, Jul. 2013.
19. Kim, Y.-J., D. Ha, W. J. Chappell, and P. P. Irazoqui, "Selective wireless power transfer for smart power distribution in a miniature-sized multiple-receiver system," IEEE Trans. Ind. Electron., Vol. 63, No. 3, 1853-1862, Mar. 2016.
20. Zhang, Y., T. Lu, Z. Zhao, F. He, K. Chen, and L. Yuan, "Selective wireless power transfer to multiple loads using receivers of different resonant frequencies," IEEE Trans. Power Electron., Vol. 30, No. 1, 6001-6005, Nov. 2015.
21. Zhang, C., D. Lin, and S. Y. Hui, "Basic control principles of omnidirectional wireless power transfer," IEEE Trans. Power Electron., Vol. 31, No. 7, 5215-5227, Jul. 2016.
22. Lin, D., C. Zhang, and S. Y. R. Hui, "Mathematical analysis of omnidirectional wireless power transfer — Part-I: Two-dimensional systems," IEEE Trans. Power Electron., Vol. 32, No. 1, 625-633, Jan. 2016.
23. Lin, D., C. Zhang, and S. Y. R. Hui, "Mathematical analysis of omnidirectional wireless power transfer — Part-II: Three-dimensional systems," IEEE Trans. Power Electron., Vol. 32, No. 1, 613-624, Jan. 2017.
24. Jonah, O., S. V. Georgakopoulos, and M. M. Tentzeris, "Orientation insensitive power transfer by magnetic resonance for mobile devices," Proc. IEEE Wireless Power Transfer, 5-8, May 2013.
25. Dai, Z., Z. Fang, H. Huang, Y. He, and J. Wang, "Selective omnidirectional magnetic resonant coupling wireless power transfer with multiple-receiver system," IEEE Access, Vol. 6, 19287-19294, Apr. 2018.
26. Ouyang, Z., Z. Zhang, M. A. E. Andersen, and O. C. Thomsen, "Four quadrants integrated transformers for dual-input isolated DC-DC converters," IEEE Trans. Power Electron., Vol. 27, No. 6, 2697-2702, Jun. 2012.
27. 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, Feb. 2011.
28. Liu, X. and G. Wang, "A novel wireless power transfer system with double intermediate resonant coils," IEEE Trans. Ind. Electron., Vol. 63, No. 4, 2174-2180, Apr. 2016.
29. Ha-Van, N. and C. Seo, "Analytical and experimental investigations of omnidirectional wireless power transfer using a cubic transmitter," IEEE Trans. Ind. Electron., Vol. 65, No. 2, 1358-1366, Feb. 2018.