磁共振式无线电能传输相控电容调谐新方法

摘要

The transmission efficiency of the magnetic resonant wireless power transfer is studied , which reveals that the quality factor of the resonant circuit is the key to achieving high transmission efficiency . For the detuning of the high quality resonant circuit ,a turning method based on the phase-control capaci-tor was addressed;A controllable capacitor was achieved by adjusting the phase angle of recharging .Thus, the transmission efficiency and power of wireless power transfer can maintain stable by using this phase -control capacitor .The theory of phase-control turning was analyzed .The circuit of phase-control capacitor was discussed ,and the relationship between the equivalent capacitor and the phase angle was calculated . Then,simulations and experiments were carried out to verify the validity .It shows that the proposed meth-od is feasible ,and important to the application of wireless power transfer due to mproving the transmission quality .%研究了磁共振式无线电能传输的传输效率，指出获得高传输效率的关键在于提高谐振电路的品质因数；针对高品质因数谐振电路的易失谐性，提出一种基于相控电容的谐振电路调谐方法：通过改变相控电容的相位角，等效形成一个可变电容，用此可变电容对谐振电路进行调谐，从而稳定传输效率和功率。分析相控电容调谐原理，设计相控电容调谐电路，给出相位与等效电容之间的对应关系，并采用仿真和实验的方法对其调谐特性进行了验证。结果表明：相控电容调谐具有一定的可行性，可使磁共振式无线电能传输在耦合改变时，通过谐振补偿来维持电能传输的稳定性，因而对其推广应用具有重要意义。