基于赫姆霍兹线圈LCC-S型多负载无线电能传输系统的研究

Research on LCC-S multi-load wireless power transfer system based on Helmholtz coil

针对多负载无线电能传输系统存在负载之间功率分配不均及取放负载时对其他负载有影响的问题,提出了基于赫姆霍兹线圈LCC-S型多负载无线电能传输系统。首先,利用电路互感模型对该系统进行了建模分析,推导出了流过发射线圈的电流、输出电压及效率的表达式,研究了工作频率和负载个数对效率的影响,该系统还具有恒压输出的特性。其次,为了使发射线圈产生的磁场更加均匀,发射线圈采用赫姆霍兹线圈,利用有限元仿真软件设计了两种赫姆霍兹线圈,这两种赫姆霍兹线圈在轴中心附近的较大范围内产生均匀的磁场。最后通过仿真验证了理论分析的正确性。

For the problems of multi-load wireless power transfer system existing uneven power distribution between loads and affecting other loads with picking up and dropping loads,the LCC-S multi-load wireless power transfer system based on Helmholtz coil was presented.Firstly,the circuit mutual inductance model was used to build model and analyze the system,and the expressions of the current flowing through the transmitting coil,output voltage and efficiency were derived.The effects of opera-ting frequency and number of loads on efficiency were studied.The system also has the characteristic of constant voltage output.In order to make the magnetic field generated by the transmitting coil more uniform,the transmitting coil of this work used Helmholtz coil,the two kinds of Helmholtz coils were designed by finite element simulation software.The even magnetic field was made by the two kinds of Helmholtz coils in a larger range near the center of the axis.Finally,the correctness of the theoretical analysis was verified by the simulation.