Abstract：Today’s wireless charging for movable handy terminals like mobile phones utilizes a charging pad on which the terminals must be placed horizontally. This working mode cannot meet the requirement of charging while working. Given that variousdevices need to work in upright mode, a novel wireless power transfer (WPT) system based on vertical repeater was proposed. An L-shaped charging base in which the lateral transmitter and the repeater on the base cooperate to charge devices at any angle on and in vicinity of the base, was designed. Analysis of the equivalent circuit model was conducted and expressions of transmission power and efficiency were obtained. Transmission characteristics at three typical positions of the receiver were studied through simulation and verified by experiments. The relative position of repeater to the transmitterwas optimized through simulation and the experimental results show that the efficiency can achieve a improvement up to 6%.
[1] Kurs A, Karalis A, Moffatt R, et al.Wireless power transfer via strongly coupled magnetic resonances[J]. Science, 2007, 317(5834): 83-86. [2] 李阳, 张雅希, 杨庆新, 等. 磁耦合谐振式无线电能传输系统最大功率效率点分析与实验验证[J]. 电工技术学报, 2016, 31(2): 18-24. Li Yang, Zhang Yaxi, Yang Qingxin, et al.Analysis and experimental validation on maximum power and efficiency in wireless power transfer system via coupled magnetic resonances[J]. Transactions of China Electrotechnical Society, 2016, 31(2): 18-24. [3] 李阳, 杨庆新, 闫卓, 等. 磁耦合谐振式无线电能传输方向性分析与验证[J]. 电工技术学报, 2014, 29(2): 197-203. Li Yang, Yang Qingxin, Yan Zhuo, et al.Analysis and validation on characteristic of orientation in wireless power transfer system via coupled magnetic resonances[J]. Transactions of China Electrotechnical Society, 2014, 29(2): 197-203. [4] 赵争鸣, 张艺明, 陈凯楠. 磁耦合谐振式无线电能传输技术新进展[J]. 中国电机工程学报, 2013, 33(3): 1-13. Zhao Zhengming, Zhang Yiming, Chen Kainan.New progress of magnetically-coupled resonant wireless power transfer technology[J]. Proceedings of the CSEE, 2013, 33(3): 1-13 [5] 李阳, 杨庆新, 闫卓, 等. 无线电能有效传输距离及其影响因素分析[J]. 电工技术学报, 2013, 28(1): 106-112. Li Yang, Yang Qingxin, Yan Zhuo, et al.Analysis on effective range of wireless power transfer and its impact factors[J]. Transactions of China Electrotechnical Society, 2013, 28(1): 106-112. [6] Uchida A, Shimokawa S, Kawano H, et al.Phase and intensity control of multiple coil currents in resonant magnetic coupling[C]//Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications, Kyoto, Japan, 2012: 53-56. [7] Uchida A, Shimokawa S, Kawano H, et al.Phase and intensity control of multiple coil currents in mid-range wireless power transfer[J]. IET Microwaves Antennas & Propagation, 2014, 8(7): 498-505. [8] Ishizaki T, Nojiri S, Ishida T, et al.3-D free-access WPT system for charging movable terminals[C]//Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems and Applications(IMWS), 2012 IEEE MTT-S International, Kyoto, Japan, 2012: 219-222. [9] 黄君涛, 陈乾宏, 陈文仙, 等. 四线圈激励共振式无线电能传输系统及其研究分析[J]. 电力系统自动化, 2015, 39(16): 108-114. Huang Juntao, Chen Qianhong, Chen Wenxian, et al.A four-coil excited wireless power transmission region via magnetic resonance and its research analysis[J]. Automation of Electric Power Systems, 2015, 39(16): 108-114. [10] 毛世通, 朱春波, 李阳, 等. 应用于无线电能传输系统的中继线圈工作性能[J]. 电工技术学报, 2014, 29(9): 27-32. Mao Shitong, Zhu Chunbo, Li Yang, et al.Operation performance of repeating coil for wireless power transfer[J]. Transactions of China Electrotechnical Society, 2014, 29(9): 27-32. [11] 黄智慧, 王林, 邹积岩. 双中继和三中继线圈位置参数对无线电能传输功率的影响[J]. 电工技术学报, 2017, 32(5): 208-214. Huang Zhihui, Wang Lin, ZouJiyan. The influence of coil location parameters to load power in wireless power transmission with two or three relay coils[J]. Transactions of China Electrotechnical Society, 2017, 32(5): 208-214. [12] Zhang F, Hackworth S A, Fu Weinong, et al.Relay effect of wireless power transfer using strongly coupled magnetic resonances[J]. IEEE Transactions on Magnetics, 2011, 47(5): 1478-1481. [13] Kim J W, Son H C, Kim K H, et al.Efficiency analysis of magnetic resonance wireless power transfer with intermediate resonant coil[J]. IEEE Antennas & Wireless Propagation Letters, 2011, 10(3): 389-392. [14] Kim J, Son H C, Kim D H, et al.Optimal design of a wireless power transfer system with multiple self-resonators for an LED TV[J]. IEEE Transactions on Consumer Electronics, 2012, 58(3): 775-780. [15] Chi K L, Zhong W X, Hui S Y R. Effects of magnetic coupling of nonadjacent resonators on wireless power domino-resonator systems[J]. IEEE Transactions on Power Electronics, 2012, 27(4): 1905-1916. [16] Ahn D, Hong S.A study on magnetic field repeater in wireless power transfer[J]. IEEE Transactions on Industrial Electronics, 2013, 60(1): 360-371.
2019, Vol. 34 
