磁耦合谐振式无线电能传输系统中线圈谐振特性研究

Coil Resonance Characteristics of Magnetically-coupled Resonant Wireless Power Transmission System

针对磁耦合谐振式无线电能传输系统中激励线圈与发射线圈是否谐振、接收线圈与负载线圈是否谐振,建立了4种结构模型;采用电路理论,详细分析了4种结构模型下的等效阻抗,并通过Pspice仿真重点分析了在相同参数下4种模型的输出功率。仿真结果表明,激励线圈与发射线圈谐振且接收线圈与负载线圈不谐振时的结构输出功率最大,且在大负载情况下,仍具有高效率。在电源频率为13.56 MHz,发射线圈与接收线圈的距离为26.8cm,耦合系数为0.2,负载为32Ω的情况下采用此模型,输出功率达到136.25 W。

Four types of model for magnetically coupled resonant wireless power transmission system is founded according to whether or not the excitation coil and the transmitting coil, the receiving coil and the load coil are resonant. Using circuit theory, The Equivalent impedance of four structural model is analyzed in this paper. With the same parameters ,the output power of four model is obtained by PSpice simulation. The simulation results show that with the heavy load the high efficiency can be reached and the output power is maximum when the excitation coil and the transmitting coil is resonant and the receiving coil and load coil is not resonant. The output power reaches 136.25 W when the source frequency is 13.56 MHz,the distance between the transmitting coil and the receiving coil is 26.8 cm, the coupled coefficient is 0.2, the load is 32 Ω.