Acknowledgement
This work was supported by the National Natural Science Foundation of China under Grant 52007188 and the Natural Science Foundation of Jiangsu Province under Grant BK20200659. And the National Natural Science Foundation of China under Grant 52107012.
References
- Wu, Q., Wang, L., Ju, D., et al.: Design of efficient optimized wireless power transfer system. J. Power Electron. 20, 1121-1129 (2020) https://doi.org/10.1007/s43236-020-00103-w
- Wang, T., Yang, C.: Magnetic field optimization for high-positioning-tolerant wireless charging platforms. J. Power Electron. 20, 22-33 (2020) https://doi.org/10.1007/s43236-019-00018-1
- Fan, X., Gao, L., Mo, X., Zhao, Q., Jia, E.: Overview of research status and application of wireless power transmission technology. Trans. China. Electrotech. Soc. 34(7), 1353-1380 (2019)
- Chen, C., Li, J., Wang, L., et al.: Wireless power transfer system for angled concave conditions utilizing quasi-bowl-shaped couplers. J. Power Electron. 21, 1061-1071 (2021) https://doi.org/10.1007/s43236-021-00244-6
- Zhang, Z., Pang, H., Georgiadis, A., Cecati, C.: Wireless power transfer-an overview. IEEE Trans. Ind. Electron. 66(2), 1044-1058 (2019) https://doi.org/10.1109/TIE.2018.2835378
- Shangguan, X., Tan, P., Tan, T., et al.: Unified magnetic field model of regular polygonal coils for electromagnetic assessment in WPT systems. J. Power Electron. 22, 522-533 (2022) https://doi.org/10.1007/s43236-021-00371-0
- Liu, S., Shen, Y., Wu, Y., Lin, J., Hu, M.: Study on frequency tracking for wireless power transfer system using magnetic resonant coupling. In: 13th IEEE Conference on Industrial Electronics and Applications (ICIEA), Wuhan. pp. 2569-2572. IEEE (2018)
- Huang, R., Zhang, B., Qiu, D., Zhang, Y.: Frequency splitting phenomena of magnetic resonant coupling wireless power transfer. IEEE Trans. Magn. 50(11), 1-4 (2014)
- Agbinya, J.I., Nguyen, H.: Principles and applications of frequency splitting in inductive communications and wireless power transfer systems. Wireless pers commun. 107(2), 987-1017 (2019) https://doi.org/10.1007/s11277-019-06313-1
- Assawaworrarit, S., Yu, X., Fan, S.: Robust wireless power transfer using a nonlinear parity-time-symmetric circuit. Nature 546(7658), 387-390 (2017) https://doi.org/10.1038/nature22404
- Shu, X., Zhang, B., Wei, Z., Rong, C., Sun, S.: Extended-distance wireless power transfer system with constant output power and transfer efficiency based on parity-time-symmetric principle. IEEE Trans. Power Electron. 36(8), 8861-8871 (2021) https://doi.org/10.1109/TPEL.2021.3056538
- Assawaworrarit, S., Fan, S.: Robust and efficient wireless power transfer using a switch-mode implementation of a nonlinear parity-time symmetric circuit. Nat electron. 3(5), 273-279 (2020) https://doi.org/10.1038/s41928-020-0399-7
- Luo, C., Qiu, D., Lin, M., Zhang, B.: Circuit model and analysis of multi-load wireless power transfer system based on parity-time symmetry. Energies 13(12), 3260 (2020)
- Liao, Z., Feng, Q., Wu, F., Jiang, C., Xia, C.: Real eigenstate operating modes and energy efficiency characteristic analysis of magnetic coupling wireless power transfer system. Autom. Electric. Power Syst. 46(3), 164-174 (2022)
- Li, Y., Hu, J., Liu, M., Chen, Y., Chan, K.W., et al.: Reconfgurable intermediate resonant circuit based wpt system with load-independent constant output current and voltage for charging battery. IEEE Trans. Power Electron. 34(3), 1988-1992 (2019) https://doi.org/10.1109/TPEL.2018.2858566
- Wang, Z., Sun, X., Zhang, Q., et al.: Matching network design for input impedance optimization of four-coil magnetic resonance coupling wireless power transfer systems. J. Power Electron. 22, 1627-1637 (2022) https://doi.org/10.1007/s43236-022-00468-0
- Lee, J., Lee, K., Cho, D.: Stability improvement of transmission efficiency based on a relay resonator in a wireless power transfer system. IEEE Trans. Power Electron. 32(5), 3297-3300 (2017) https://doi.org/10.1109/TPEL.2017.2651155
- Zhong, W.X., Zhang, C., Xun, L., Ron Hui, S.Y.: A methodology for making a three-coil wireless power transfer system more energy efficient than a two-coil counterpart for extended transfer distance. IEEE Trans. Power Electron. 30(2), 933-942 (2015) https://doi.org/10.1109/TPEL.2014.2312020
- Meng, Y., Wang, Z., Jiang, P., et al.: Optimization and analysis of Helmholtz-like three-coil wireless power transfer system applied in gastrointestinal robots. J. Power Electron. 20, 1088-1098 (2020) https://doi.org/10.1007/s43236-020-00080-0
- Ye, Z., Sun, Y., Dai, X., Tang, C., Wang, Z., et al.: Energy efficiency analysis of u-coil wireless power transfer system. IEEE Trans. Power Electron. 31(7), 4809-4817 (2016)
- Zhou, J., Zhang, B., Xiao, W., Qiu, D., Chen, Y.: Nonlinear parity-time-symmetric model for constant efficiency wireless power transfer: application to a drone-in-fight wireless charging platform. IEEE Trans. Ind. Electron. 66(5), 4097-4107 (2019) https://doi.org/10.1109/TIE.2018.2864515