平板磁芯磁耦合谐振式无线电能传输技术

Magnetic resonant wireless power transmission technology based on planar core

摘要:

为了增加磁耦合谐振式无线电能传输系统中发射／接收线圈的自感量以及二者间的耦合系数,提高系统的传输功率和效率,提出利用高磁导率平板磁芯绕制发射／接收线圈的方案．对传输系统进行耦合电路建模,通过电路微分方程给出传输系统相关参数的数学表达式,设计并优化了系统实验平台,研究了加入平板磁芯后系统耦合系数的变化,工作频率对传输的影响,发射与接收的移位传输以及系统的功率传输特性．实现了距离10 cm以上,功率1.85 kW的无线电能传输,系统整体传输效率达到80％以上．平板磁芯耦合机构体积小,在较大水平移位(25％)情况下实现了稳定高效传输．

Abstract:

Planar core is added to the magnetic resonant wireless power transmission system to increase the self-inductance and the coupling coefficient between the primary coil and secondary coil, and to enhance the transfer power and efficiency. Based on the equivalent circuit analysis, mathematical expression of system parameters are given by the circuit differential equations. Furthermore, a prototype of wireless power transmission system is built, and experiments including coupling coefficient, operating frequency, misalignment, and power transfer characteristic of the system are conducted. The system realizes 1.85 kW power transmission with 10 cm air gap and 80％ efficiency. By using the planar core, the coupling mechanism can achieve stable and effective transmission in 25％ misalignment, and its volume is smaller.