Abstract PCB coils with unique advantages, which is widely used in magnetic resonant wireless power transmission. when the transfer distance of system is short, which leads to a sharp decline in the efficiency. Aiming at this problem, this paper presents an effective method to improve the short distance transfer efficiency. Firstly, this paper analyses the work principle of antiparallel coil, then provides the calculation formulas of the parameters of the coil, and then analyses magnetic resonant system of the four coils structure. Finally, experimental results show the method is feasible, which can provide a reference for the design of short distance magnetic resonant wireless power transfer technology.
Qiu Xiaohui,Lu Wencheng,Mao Xingkui. The Method for Improving the Short Distance Transfer Efficiency of PCB Coil[J]. Electrical Engineering, 2015, 16(11): 7-11.
[1] Kurs A, Karalis A, Moffatt R, et al. Wireless power transfer via strongly coupled magnetic resonances[J]. Science (New York, N.Y.), 2007, 317(5834): 83-86. [2] 毛银花. 用于无线传感器网络的磁共振式无线能量传输系统[D]. 哈尔滨: 哈尔滨工业大学, 2011. [3] Tak Y, Park J, Nam S. Mode-Based analysis of resonant characteristics for Near-Field coupled small antennas[J]. Antennas and Wireless Propagation Letters, IEEE, 2009(8): 1238-1241. [4] 李阳, 杨庆新, 闫卓, 等. 磁耦合谐振式无线电能传输系统的频率特性[J]. 电机与控制学报, 2012, 16(7): 7-11. [5] 傅文珍, 张波, 丘东元. 频率跟踪式谐振耦合电能无线传输系统研究[J]. 变频器世界, 2009(8): 41-46, 103. [6] Y. Tak, J. Park,and S.Nam, “Mode-based analysis of resonant characteristics for near-field coupled small antennas,” IEEE Antennas WirelessPropag. Lett., 2009(8): 1238-1241. [7] Lee WS, Wang-Ik S, Oh KS, et al. Contactless energy transfer systems using antiparallel resonant loops[J]. Industrial Electronics, IEEE Transactions on, 2013, 60(1): 350-359. [8] 沈娜, 李长生, 张合. 磁耦合共振无线能量传输系统建模与分析[J]. 仪器仪表学报, 2012, 33(12): 2735-2741. [9] 王国波, 张流强, 夏华灿, 等. 平面螺旋电感的计算和影响Q值的因素探讨[C]. 第五届中国（国际）纳米科技西安研讨会文集, 2006: 111-116. [10] Lee T. H. The designof CMOS radio-frequency integrated circuits[M]. Cambridge Univ Pr, 2004: 139-140.
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