线圈匝数对磁耦合谐振式WPT输出功率的影响

Effect between coil turns and output power of magnetic resonant coupling wireless power transmission

针对磁耦合谐振式无线电能传输的4线圈模型中线圈匝数对系统传输功率的影响,本文通过建立系统模型,利用电路理论计算得出系统的输出功率公式,并使用MATLAB软件仿真分析了系统的输出功率曲线。分析结果表明在4线圈的结构和材质相同的情况下,接收线圈的匝数增加比发射线圈匝数的增加使系统的输出功率要提高很多。同时,接收线圈匝数的增加使系统功率达到最大值的频率有明显的下降,而发射线圈增加相同匝数时,频率变化不明显。该结果还表明,接收线圈匝数增加时系统输出功率达到最大值对应的负载电阻在变大。因此,在4个线圈结构相同时,增加接受线圈匝数可以提高输出功率。

In order to analyze the effect between output power and coil turns of the four coils model of magnetic resonant coupling wireless power transmission system,in this paper,the system model was established and the output power formula was calculated using the circuit theory.The output power curve of system was analyzed through the MATLAB software simulation.The result shows that the increase of the receiving coil turns make the system output more power than the increase of the transmitter coil turns when the four coils have the same structure and material.Meanwhile,the increase of receiving coil turns make the system frequency have obvious drop when the system reach maximum output power,and the frequency variation is not obvious when the increase of transmitter coil turns.The result also shows that when the receiving coil turns increase the peak load resistance of output power is also increasing.So when the four coils have same structure,the increase receiving coil turns can improve the output power.