基于磁耦合谐振的无线能量传输的实验研究

磁耦合谐振技术作为中距离高效无线能量传输技术,与传统无线能量传输技术相比具有传输效率高、条件要求低等明显优势,目前国内对此技术的研究大都处于探索阶段。为了准确把握技术核心以及关键点,本文首先建立了无线电能传输模型,并在此基础上利用互感原理和耦合理论对传输效率进行了推导,得出了谐振频率、线圈互感、线圈品质因数等影响传输效率的关键因素。随后,通过大量实验验证了上述理论分析结论,并且对理论推导结论中未体现的因素进行了实验探索,所得结果对原有理论进行了有益补充,在实验室条件下实现了传输效率为60%、接收功率为2W的电能传输。另外,在对发射谐振频率和接收谐振频率与系统谐振频率的关系分析中,利用互感理论解释了接收端谐振频率与系统谐振频率相同的必要性。最后,总结了在磁耦合谐振式无线能量传输技术应用过程中提高传输效率和有效传输距离的若干方法。

Experimental Research on Wireless Power Transmission Based on Magnetic Coupling Resonant Theory

The magnetic coupling resonant is a kind of middle-distance high-efficiency wireless power transmission technique,which has the advantage of high transmission efficiency and low condition requirement compared with the traditional wireless power transmission technology.But the research on this technique is still in the experimental phase.In order to study the key points of this technology accurately,a wireless power transmission model is built firstly,based on which the expression of transmission efficiency is deduced based on mutual induction principle and strong coupling theory.Then,the key factors that influence the resonant frequency,the mutual induction of coil and the quality factor on transmission efficiency are obtained.Subsequently,many experiments verify above theoretical analysis conclusions,and the factors that are not reflected in the theoretical analysis are also explored by experiments,which is a valid supplement to the original theory.In the experiment,the power with 2W receiving power and over 60% transmission efficiency can be transferred.In addition,in the analysis of the relationship between the system resonant frequency and sending-receiving resonant frequency,the necessity that the receiver and system should has same resonant frequency is also explained by the mutual induction principle.In the end,the general methods of improving the transmission efficiency and valid transmission distance in the application of magnetic coupling resonant technology have been concluded.