摘要
针对磁耦合谐振式无线电能传输(magnetically coupled resonant wireless power transfer,MCR-WPT)系统接收线圈相对于发射线圈偏移角度的不确定性,导致系统传输效率波动较大的问题,提出了一种基于反射阻抗的MCR-WPT系统接收线圈偏移角度计算方法。根据基尔霍夫电压定律建立发射线圈反射阻抗与线圈互感之间的关联,再根据空间两线圈的互感公式推导互感与线圈偏移角度之间的关系式,从而建立反射阻抗与偏移角度的表达式。利用Maxwell和Simplorer仿真软件搭建线圈模型和外围电路进行联合仿真,同时搭建了完整的MCR-WPT系统实验装置,在两线圈距离不同的情况下做了多组实验。仿真结果显示两线圈设定角度与计算角度平均绝对误差为2.57°,实验结果显示设定角度与计算角度平均绝对误差为2.94°。通过上述方法可以较为精确地计算出短距离无线电能传输系统接收线圈的偏移角度。
Aiming at the uncertainty of the offset angle of the receiving coil relative to the transmitting coil in the magnetically coupled resonant wireless power transfer(MCR-WPT)system,which leads to large fluctuations in the transmission efficiency of the system,a method for calculating the offset angle of the receiving coil in MCR-WPT system based on the reflection impedance is proposed.According to Kirchhoff’s voltage law,the relation between the reflection impedance of the transmitting coil and the mutual inductance of two coils is established,then the relation equation of the mutual inductance and the coil offset angle is derived according to the mutual inductance formula of two coils.Therefore,the expression for the reflection impedance and the offset angle is derived.The coils model and peripheral circuits are built using Maxwell and Simplorer simulation software for co-simulation.Meanwhile,a MCR-WPT experimental system is built,and multiple sets of experiments are conducted under different coil distances.The simulation results show that the mean absolute error between the set angle of two coils and the calculated angle is 2.57°.The experimental results show that the aforementioned mean absolute error is 2.94°.The offset angle of the receiving coil of the short-distance wireless power transmission system can be calculated accurately through the above method.
作者
江兵
王子博
俞子豪
袁明
Jiang Bing;Wang Zibo;Yu Zihao;Yuan Ming(School of Automation,Nanjing University of Posts and Telecommunications,Nanjing 210046,China)
出处
《电子测量与仪器学报》
CSCD
北大核心
2023年第9期1-7,共7页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(61701250)项目资助。
关键词
无线电能传输
角度偏移
反射阻抗
互感
wireless power transmission
angle offset
reflected impedance
mutual inductance
