磁耦合谐振式无线电能传输系统中锥形谐振线圈结构优化

Structural optimization of tapered resonant coil in magnetically coupled resonant wireless power transfer system

在磁耦合谐振式无线电能传输系统中,谐振线圈结构是影响电能传输效率的关键因素.针对锥形谐振线圈结构,基于电路理论,推导了电能传输效率与电路参数的关系表达式;采用数值计算方法,对比研究了锥形谐振线圈与螺旋谐振线圈的电能传输效率.结果表明,轴向间距在一定范围内,锥形谐振线圈电能传输效率更高;进一步研究了锥形谐振线圈结构参数与电能传输效率的关系,提出谐振线圈结构优化方案;实验结果证明,与螺旋谐振线圈比较,锥形谐振线圈的电能传输效率更高.

In the magnetically coupled resonant wireless power transfer system,resonant coil structure is the key factor affecting the power transmission efficiency.Based on the circuit theory,the expression is deduced for the relationship between power transmission efficiency and circuit parameters.The power transmission efficiencies of the tapered resonant coil and the helical resonant coil were comparatively studied by numerical calculation.The results show that the energy transmission efficiency of the tapered resonant coil is higher when the axial spacing is within a certain range.The relationship between the structural parameters of the tapered resonant coil and the power transmission efficiency was further studied,and the optimization criterion of the resonant coil structure was proposed.The experimental results demonstrate that the power transmission efficiency of the tapered resonant coil is higher than that of the helical resonant coil.