印制电路板射频线圈的部分元等效电路研究  

Research on the Partial Element Equivalent Circuit of Radio Frequency Coil on the Printed Circuit Board

作　　者：徐显能 徐征[1] Xu Xianneng;Xu Zheng(School of Electrical Engineering Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学电气工程学院,重庆400044

出　　处：《电工技术学报》2022年第17期4284-4293,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52077023)。

摘　　要：印制电路板(PCB)射频线圈具有性能优良、占用空间少且制作工艺简单的特点,常用于无线电能传输以及单边核磁测井等领域。为分析线圈性能,需计算交流电阻、电感以及射频磁场分布。由于PCB线圈铜线厚度与外围尺寸跨度大,尤其在考虑金属涡流时,常规有限元软件与解析法在处理这种多尺度电磁场问题时的计算速度与精度无法达到要求。在0.5~15MHz频率范围内,该文采用部分元等效电路(PEEC)法计算金属涡流下PCB线圈(铜厚为35μm)的阻抗与射频磁场分布。建立平面矩形螺旋PCB线圈的PEEC模型;通过计算结果与实测结果对比,总结给出PEEC剖分参数选取方法;分析PEEC模型下线圈的磁场分布;最终实现金属涡流下PCB线圈的阻抗与射频磁场的准确且快速计算。该文工作可为应用于无线电能传输以及单边核磁测井等领域的PCB线圈分析提供参考。PCB coils have the features of excellent performance,less space and easy manufacture artwork,and they are often used in fields of wireless power transmission and unilateral nuclear magnetic logging.In order to analyze the performance of PCB coil,it is necessary to calculate AC resistance,inductance and radio frequency magnetic field distribution.Due to the large span of copper wire thickness and outer dimensions,the calculation speed and accuracy of conventional finite element software and analytical methods cannot meet requirements,particularly when considering the metal eddy currents.In the frequency range of 0.5~15MHz,this paper adopted the partial element equivalent circuit(PEEC)method to calculate the impedance and radio frequency magnetic field distribution of PCB coil(copper thickness of 35μm)under metal eddy current.The PEEC model of the planar rectangular spiral PCB coil was established,the method for selecting the PEEC meshing parameters was summarized by making a comparison between calculation and the measurement results and the magnetic field distribution of the coil under PEEC model was analyzed.Finally,the accurate and fast calculation of the impedance and the radio frequency magnetic field of PCB coil under metal eddy current was realized.The work in this paper can provide references for PCB coil analysis in the fields of wireless power transmission and unilateral nuclear magnetic logging.

关 键 词：部分元等效电路 PCB线圈 多尺度 交流电阻 涡流 

分 类 号：TM13[电气工程—电工理论与新技术] TH89[机械工程—仪器科学与技术]