Comparative Analysis of Coil Designs for Maximizing Wireless Power Transfer Efficiency

Abstract: Wireless Power Transfer (WPT) is an innovative technology enabling efficient and contactless energy transmission, with applications spanning consumer electronics, medical devices, and electric vehicles. This study focuses on optimizing WPT efficiency by analysing the impact of coil geometry, material properties, and system parameters. Three coil designs: planar spiral, helical spiral, and rectangular were evaluated through simulation to determine their energy transfer efficiency over varying distances. The results indicate that the helical spiral coil, made of copper, exhibited the highest efficiency, exceeding 90% at short distances and maintaining superior performance compared to other geometries as transmission distance increased. This advantage is attributed to its stronger magnetic coupling, reduced resistive losses, and more uniform electromagnetic field distribution. These findings underscore the importance of coil design optimization in maximizing WPT performance and provide valuable insights for developing high-efficiency wireless energy systems across various applications.

Wireless Power Transfer, Coil Geometry Optimization, Magnetic Coupling Efficiency, Energy Transfer Performance

1. Aboualalaa, M., Mansour, I., Barakat, A., Yoshitomi, K., & Pokharel, R. K. (2020). Improvement of magnetic field for near-field WPT system using two concentric open-loop spiral resonators. IEEE Microwave and Wireless Components Letters, 30(10), 993-996. [Google Scholar] [Crossref]

2. Dai, J., & Ludois, D. C. (2015). A survey of wireless power transfer and a critical comparison of inductive and capacitive coupling for small gap applications. IEEE Transactions on Power Electronics, 30(11), 6017-6029. [Google Scholar] [Crossref]

3. Adewuyi, V. O. (2022). Overview and advancements in electric vehicle WPT systems architecture. In Power Electronics, Radio Frequency and Microwave Engineering. IntechOpen. [Google Scholar] [Crossref]

4. Shi, Z. H., Qiu, Z. C., Chen, X. Y., & Li, M. Y. (2019). Modeling and experimental verification of bidirectional wireless power transfer. IEEE Transactions on Applied Superconductivity, 29(2), 1-5. [Google Scholar] [Crossref]

5. Stankiewicz, J. M. (2021). Comparison of the efficiency of the WPT system using circular or square planar coils. Przegląd Elektrotechniczny, 97(10), 38-43. [Google Scholar] [Crossref]

6. Mou, X., Gladwin, D. T., Zhao, R., & Sun, H. (2019). Survey on magnetic resonant coupling wireless power transfer technology for electric vehicle charging. IET Power Electronics, 12(12), 3005-3020. [Google Scholar] [Crossref]

7. Li, S., & Mi, C. C. (2014). Wireless power transfer for electric vehicle applications. IEEE journal of emerging and selected topics in power electronics, 3(1), 4-17. [Google Scholar] [Crossref]

8. Usikalu, M. R., Adewole, S. A., Achuka, J. A., Adagunodo, T. A., Abodunrin, T. J., & Obafemi, L. N. (2019, August). Investigation into wireless power transfer in near field using induction technique. In Journal of Physics: Conference Series (Vol. 1299, No. 1, p. 012047). IOP Publishing. [Google Scholar] [Crossref]

9. Shi, X., Qi, C., Qu, M., Ye, S., Wang, G., Sun, L., & Yu, Z. (2014). Effects of coil shapes on wireless power transfer via magnetic resonance coupling. Journal of Electromagnetic Waves and Applications, 28(11), 1316-1324. [Google Scholar] [Crossref]

10. Hui, S. Y. R., Zhong, W., & Lee, C. K. (2013). A critical review of recent progress in mid-range wireless power transfer. IEEE transactions on power electronics, 29(9), 4500-4511. [Google Scholar] [Crossref]

11. Yang, C. L., Chang, C. K., Lee, S. Y., Chang, S. J., & Chiou, L. Y. (2017). Efficient four-coil wireless power transfer for deep brain stimulation. IEEE Transactions on Microwave Theory and Techniques, 65(7), 2496-2507. [Google Scholar] [Crossref]

12. Mahesh, A., Chokkalingam, B., & Mihet-Popa, L. (2021). Inductive wireless power transfer charging for electric vehicles–a review. IEEE access, 9, 137667-137713. [Google Scholar] [Crossref]

13. Zhang, X., Zhang, X., Yao, Y., Yang, H., Wang, Y., & Xu, D. (2017, August). High-efficiency magnetic coupling resonant wireless power transfer system with class-e amplifier and class-e rectifier. In 2017 IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific) (pp. 1-5). IEEE. [Google Scholar] [Crossref]

14. Ha-Van, N., & Seo, C. (2019). Modeling and experimental validation of a butterfly-shaped wireless power transfer in biomedical implants. IEEE Access, 7, 107225-107233. [Google Scholar] [Crossref]

15. Buchmeier, G. G., Takacs, A., Dragomirescul, D., Ramos, J. A., & Montilla, A. F. (2021, June). Optimized Rectangular Planar Coil Design for Wireless Power Transfer with Free-Positioning. In 2021 IEEE Wireless Power Transfer Conference (WPTC) (pp. 1-4). IEEE. [Google Scholar] [Crossref]

16. Ben Fadhel, Y., Bouattour, G., Bouchaala, D., Derbel, N., & Kanoun, O. (2023). Model-Based Optimization of Spiral Coils for Improving Wireless Power Transfer. Energies, 16(19), 6886. [Google Scholar] [Crossref]

17. Tan, L., Zhang, M., Wang, S., Pan, S., Zhang, Z., Li, J., & Huang, X. (2019). The design and optimization of a wireless power transfer system allowing random access for multiple loads. Energies, 12(6), 1017. [Google Scholar] [Crossref]

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