Characteristic analysis of P-SP topology wireless power transfer system based on parity-time-symmetric principle
-
摘要: 宇称时间(PT)对称原理已经被验证可以作为提高无线电能传输系统自由度的有力工具,但基于PT对称的并联-并联(P-P)拓扑结构无线电能传输(WPT)系统的工作范围仍然受到限制。为解决这一问题,提出了一种基于PT对称原理的并联-串并联(P-SP)补偿WPT系统。通过等效电路法化简系统电路模型,并利用耦合模理论(CMT)分析电容分配比对振荡频率、临界耦合系数、满足系统进入PT对称区域的耦合系数和负载电阻值范围以及传输效率等工作性能的影响。构建样机开展实验,以检验所提方法的适用性,结果表明:可以在仅损失2%系统传输效率的情况下,将传输距离由110 mm扩大到210 mm,该操作可为扩大应用范围、增加应用场景、优化激光无线充电系统中发送模块单元和接收模块单元的工作性能做准备。Abstract: The parity time (PT) symmetry principle has been proved to be a powerful tool to improve the degree of freedom of wireless power transfer (WPT) systems. However, the operating range of the P-P (parallel-parallel) topology WPT system based on the PT symmetry principle is still limited. To solve this problem, a P-SP (series-parallel) compensated WPT system based on PT symmetry principle is proposed. The circuit model of the system is simplified by the equivalent circuit method, and the influence of the capacitance distribution ratio on the oscillation frequency, the critical coupling coefficient, the coupling coefficient satisfying the system entering the PT symmetric region, the load resistance range and the transmission efficiency is analyzed by the coupled mode theory. A prototype is built to carry out experiments to test the applicability of the proposed method. The results show that the transmission distance can be expanded from 110 mm to 210 mm with only 2% loss of system transmission efficiency. Hence, preparations are made to expand the application scope, increase application scenarios, and optimize the working performance of the sending and receiving module units in the laser wireless charging system.
-
表 1 实验系统参数
Table 1. Experimental system parameters
L1/μH C1/pF r1/Ω Rn/Ω L2/μH C2/pF r2/Ω Re/Ω 12 2.02 0.03 −480 12 2.02 0.03 7000 表 2 与其他文献提出的方法的比较
Table 2. Comparison with other methods proposed in literatures
-
[1] Kurs A, Karalis A, Moffatt R, et al. Wireless power transfer via strongly coupled magnetic resonances[J]. Science, 2007, 317(5834): 83-86. doi: 10.1126/science.1143254 [2] 刘耀, 肖晋宇, 赵小令, 等. 无线电能传输技术发展与应用综述[J]. 电工电能新技术, 2023, 42(2):48-67Liu Yao, Xiao Jinyu, Zhao Xiaoling, et al. Development and application review on wireless power transmission technology[J]. Advanced Technology of Electrical Engineering and Energy, 2023, 42(2): 48-67 [3] 方思远, 方东. 低功率激光在手机无线充电上的应用[J]. 机电产品开发与创新, 2021, 34(5):11-13 doi: 10.3969/j.issn.1002-6673.2021.05.004Fang Siyuan, Fang Dong. Application of low power laser in mobile phone wireless charging[J]. Development & Innovation of Machinery & Electrical Products, 2021, 34(5): 11-13 doi: 10.3969/j.issn.1002-6673.2021.05.004 [4] Li Changsheng, Dong Wenjie, Ding Libo, et al. Transfer characteristics of the nonlinear parity-time-symmetric wireless power transfer system at detuning[J]. Energies, 2020, 13: 5175. doi: 10.3390/en13195175 [5] 胡洲, 曾招云, 唐佳, 等. 周期驱动的二能级系统中的准宇称-时间对称动力学[J]. 物理学报, 2022, 71:074207 doi: 10.7498/aps.70.20220270Hu Zhou, Zeng Zhaoyun, Tang Jia, et al. Quasi-parity-time symmetric dynamics in periodically driven two-level non-Hermitian system[J]. Acta Physica Sinica, 2022, 71: 074207 doi: 10.7498/aps.70.20220270 [6] 王兆延, 丘东元, 张波, 等. 具有恒功率恒效率输出特性的三线圈WPT系统[J]. 中国电机工程学报, 2022, 42(20):7332-7343Wang Zhaoyan, Qiu Dongyuan, Zhang Bo, et al. Three-coil wireless power transfer system with constant output power and constant transfer efficiency characteristics[J]. Proceedings of the CSEE, 2022, 42(20): 7332-7343 [7] Rayan B A, Subramaniam U, Balamurugan S. Wireless power transfer in electric vehicles: a review on compensation topologies, coil structures, and safety aspects[J]. Energies, 2023, 16: 3084. doi: 10.3390/en16073084 [8] Rong Chao, Zhang Bo, Wei Zhihao, et al. A wireless power transfer system for spinal cord stimulation based on generalized parity–time symmetry condition[J]. IEEE Transactions on Industry Applications, 2022, 58(1): 1330-1339. doi: 10.1109/TIA.2021.3090751 [9] Assawaworrarit S, Yu Xiaofang, Fan Shanhui. Robust wireless power transfer using a nonlinear parity–time-symmetric circuit[J]. Nature, 2017, 546(7658): 387-390. doi: 10.1038/nature22404 [10] Chen Jintao, Xie Fan, Zhang Bo, et al. Transmission range extension strategy of parity-time-symmetry-based wireless power transfer system by a boost converter[J]. International Journal of Circuit Theory and Applications, 2023, 51(2): 510-524. doi: 10.1002/cta.3434 [11] Dong Wenjie, Li Changsheng, Zhang He, et al. Wireless power transfer based on current non-linear PT-symmetry principle[J]. IET Power Electronics, 2019, 12(7): 1783-1791. doi: 10.1049/iet-pel.2018.5937 [12] Zhang Li, Yang Yihao, Zhao Jiang, et al. Demonstration of topological wireless power transfer[J]. Science Bulletin, 2021, 66(10): 974-980. doi: 10.1016/j.scib.2021.01.028 [13] Kim H, Yoo S, Joo H, et al. Wide-range robust wireless power transfer using heterogeneously coupled and flippable neutrals in parity-time symmetry[J]. Science Advances, 2022, 8: eabo4610. doi: 10.1126/sciadv.abo4610 [14] Tan Linlin, Yu Yongfeng, Wang Jiaqi, et al. Research on grid positioning strategy of coupling mechanism in wireless charging system with offset angle variable[J]. IEEE Transactions on Power Electronics, 2023, 38(5): 6670-6681. doi: 10.1109/TPEL.2023.3237901 [15] Zhaksylyk Y, Hanke U, Azadmehr M. Single-sided interspiraled inductive impedance matching for magnetic resonance wireless power transfer[J]. IEEE Transactions on Circuits and Systems I:Regular Papers, 2023, 70(5): 2189-2200. doi: 10.1109/TCSI.2023.3243924 [16] Guan Zhipeng, Zhang Bo, Qiu Dongyuan. Influence of asymmetric coil parameters on the output power characteristics of wireless power transfer systems and their applications[J]. Energies, 2019, 12: 1212. doi: 10.3390/en12071212 [17] Babic S, Salon S, Akyel C. The mutual inductance of two thin coaxial disk coils in air[J]. IEEE Transactions on Magnetics, 2004, 40(2): 822-825. doi: 10.1109/TMAG.2004.824810