磁耦合无线电能传输系统平面盘式线圈优化设计

Novel Planar Circle Coil Design for Magnetic Coupled Wireless Power Transfer System

在磁耦合无线电能传输系统中,谐振线圈是保证电能高效传输的关键部分,线圈间的互感和线圈的交流内阻直接影响到整个系统的效率。为了达到高效率传输的目的,线圈需要较大的互感和较小的交流内阻,因此线圈设计时的优化目标为线圈的互感内阻之比。基于毕奥-萨伐尔定理对线圈的互感和交流内阻进行了分析,得到互感、交流内阻与线圈关键参数之间的关系。待优化的线圈参数为线圈匝数和匝间距。提出了一种针对线圈参数的优化算法,使得设计线圈的互感内阻之比最大。基于多参数优化的遗传算法,线圈的最优参数可以通过限制条件和最大互感内阻之比条件得到。最后通过仿真验证了所求线圈是最优的,并通过试验验证了设计线圈的可行性。

In the magnetic coupled wireless power system,the resonant coil is the key to guarantee high efficiency because of the impact which is related with the mutual inductance and AC resistance of the coil.For higher power transfer efficiency,the larger mutual inductance and lower AC resistance are required,so the ratio of mutual inductance to AC resistance is set to be optimal goal for wireless power transfer system.The mutual inductance and AC resistance are analyzed through Biot-Savart law applied in the coil and the relationship between key parameters and mutual inductance,AC resistance is obtained.The parameters to be confirmed are the number of turns and the pitch of turn.An optimal design for coil’s parameters is presented based on the ratio of mutual inductance to AC resistance,and the optimum parameters are obtained based on genetic algorithm with the restriction condition and maximum ratio of mutual inductance to AC resistance.The optimum parameters were verified through the simulation result and experiments,and the design method was testified to be plausible.