品质因数与共振频率对无线电能传输的影响

Effect of quality factor and resonant frequency on wireless energy transfer system

谐振耦合式无线电能传输技术是一种新兴电能传输方式,提高传输功率和效率已成为其应用发展的瓶颈问题。通过仿真与实验探究了提高频率和改善线圈参数两种不同提高系统品质因数的方法对能量传输效率、功率与传输距离之间的影响规律。结果表明,提高系统共振频率可明显提高系统能量有效传输距离,但导致最高输出功率明显下降,而对传输效率影响不明显;改善线圈参数可显著提高最高输出功率,而对输出效率和有效传输距离影响不明显。系统频率响应仿真与实验结果显示,小幅偏离共振频率点引起输出功率急剧下降。系统共振频率随接收端与发射端间耦合系数增加出现分裂现象,造成能量传输功率下降。

Wireless energy transfer based on resonant has been an emerging power transmission technology, increasing its transmit power and efficiency is the bottleneck for its practical application. This paper investigates the effect of quality factor（Q） of the circle and the circuit on transmission efficient and power through simulation and experiments. The results show that high Q circuit can markedly increase the energy transfer distance and decrease the maximum transfer power, but not obviously affect the transfer effi- ciency. High Q circle could greatly increase the maximum transfer power, however not distinctly affect the transfer efficiency and transfer distance. The transfer power would be sharply decreased when the input frequency slightly departs from the resonant frequency of the system. Simulation and experiments show that the resonant frequency would be split when the coupling of the emission coil and the receiver coil is larger than a certain value, and simultaneously the transfer power would be decreased.