杨东升 元席希 洪欢 周博文 金正浩

摘要：磁耦合谐振式（magnetically coupled resonant，MCR）是一种适用于中距离无线电能传输的技术。该技术在传输距离变化时存在耦合状态变化的情况，随之造成的阻抗不匹配现象使系统的传输效率急剧下降。为了避免上述现象的发生，本文提出一种基于非同轴线圈的距离适应无线电能传输方法，通过该方法指导确定传输系统的驱动线圈参数，系统可以实现阻抗匹配，有效抑制因距离变化造成传输效率急剧下降的缺点，提高系统的传输性能，同时采用非同轴线圈结构可以减小驱动线圈圆周以外的导线寄生电感和高频交流电阻，降低系统损耗，减小系統发射端的体积，并且保证系统实际设计与理论计算实现高度匹配。仿真分析与实验结果均验证了该方法的有效性和准确性。

关键词：无线电能传输;耦合状态;距离适应;非同轴线圈;阻抗匹配

DOI：10.15938/j.emc.2019.09.011

中图分类号：TM 724

文献标志码：A

文章编号：1007-449X（2019）09-0084-08

Methodology of range adaptive for wireless power  transmission based on non coaxial coils

YANG Dong sheng1，WON Sok hui1，2，HONG Huan1，ZHOU Bo wen1，KIM Jong ho2

（1.College of Information Science and Engineering， Northeastern University， Shenyang  110819， China;  2.Institute of Electronic， State Academy of Sciences，Pyongyang  999093， DPRKorea）

Abstract：

The magnetically coupled resonant （MCR） technology is suitable for mid range applications of wireless power transmission （WPT）. In the practical applications of MCR， the coupling state changes with respect to the variation of transmission distances， which leads to the impedance mismatch， and consequently results in the rapid decrease of transmission efficiency. In order to avoid this phenomenon， a methodology of range adaptive with a set of non coaxial coils for WPT system was proposed， which can reasonably overcome the disadvantage of the transmission efficiency reduction due to the distance changing and improve the transmission performance of the system obviously. Meanwhile the parasitic inductance and high frequency AC resistance of unnecessary conductor in addition to coil′s circumference are avoided， and the system loss and the volume of the transmitter can be reduced. In addition， the practical design of WPT is well matched with the theoretical calculation through this methodology. The simulation and experiment results have verified the theoretical validity and accuracy of the methodology.

Keywords：wireless power transmission （WPT）; coupling state; range adaptive; non coaxial coil; impedance match

0引言

无线电能传输技术是一种新型的输电技术，它摆脱了传统有线输电的束缚，提高了输电的安全性和可靠性，因此该技术具有广阔的应用前景，比如给电动汽车、人体植入装置、便携式设备充电以及给恶劣环境中的设备供能等。自从2007年麻省理工学院的科学家Marin Soljacic提出磁耦合谐振技术以来，该技术就成为了无线电能传输中的研究热点问题。磁耦合谐振技术主要是基于发射线圈和接收线圈之间发生谐振耦合的原理，发射线圈接通高频驱动电源，线圈中会产生振荡电流进而在线圈周围产生磁场，磁场中没有接收线圈时能量会逐渐消耗殆尽，而当接收线圈进入磁场后，能量会传递到接收线圈，从而进行电能的无线传输。……