频率匹配对谐振无线电能传输效率的影响

Efficiency of frequency matching for resonant wireless power transmission system

基于共振耦合式无线电能传输机理和数学模型,对无线电能传输发送端与接收端谐振频率的测量与调整进行了研究,结合Matlab仿真和实际实验操作,研究了在固定距离下两线圈组成的系统电能传输效率与工作频率的关系,研究并比较在不同耦合系数k值条件下两端谐振点频率未匹配和匹配情况下电能传输效率.研究表明不同k值情况下电能传输效率与工作频率的关系曲线存在差异,在相同的k值条件下两端谐振点频率匹配时比两端谐振点频率不匹配时表现出更高的电能传输效率.对于远距离电能传输,即在k值较小的情况下,调节两端谐振点至频率匹配时将有效提高传输效率.

Based on the theory and mathematical model of magnetic resonant coupled wireless power trans- mission, this paper studies the measuring and adjusting of the sending coil＇s and receiving coil＇s resonant frequencies of wireless power transmission. Combining simulation in Matlab and experiments, the article discusses the system＇s transmission efficiency at a certain distance and the efficiency at different k values under the condition of whether the resonance point is frequency matching or not. The study results indicate that different values of/e have different effects on the relation curve of transmission efficiency and operating frequency. The frequency matching system shows higher efficiency than the unmatching system under the same value of k. And for the remote wireless power transmission, the value of k is very small; so the transmission efficiency will be greatly improved when the resonance point is frequency matching.