多股并联蛇形导线无线充电线圈的力电特性分析及优化设计

无线充电系统的电能利用率和功能可靠性是人们关注的重要问题。为获得高弹性延伸率、低电阻的柔性电感线圈，提出了多股并联蛇形导线无线充电线圈的设计思路。首先，对比研究了多股并联蛇形导线和单股蛇形导线的电学性能和弹性延伸率，证明了多股并联导线的优势。同时考察了导线厚度，直线段长度以及圆弧段半径和圆心角对蛇形导线的电学性能和弹性延伸率的影响。结果表明，直线段长度、圆心角、圆弧段半径是影响蛇形导线的弹性延伸率的敏感参数。最后，通过正交实验优化了影响蛇形导线弹性延伸率和电阻的敏感参数，优化后的柔性可延展线圈的电阻降低了13.5%和弹性延伸率提高了34.3%。研究结果为柔性可延展的无线充电线圈优化设计提供理论指导。

Analysis and optimization of mechanical and electrical characteristics of wireless charging coils with multi-strand serpentine interconnect

The power utilization and functional reliability of wireless charging system are important issues of concern. In order to obtain flexible inductance coil with high elastic stretchability and low resistance, the design idea of multi-strand interconnect is proposed. First, the electrical properties and elastic stretchability of multi-strand serpentine interconnect and single-strand serpentine interconnect are comparatively studied, and the advantages of the multi-strand serpentine interconnect are proved. Then, the effects of wire thickness, length of straight segment, radius of arc and central angle on the electrical properties and elastic stretchability of serpentine interconnect are investigated. The results show that the length of the straight segment, the central angle and radius of arc are sensitive parameters affecting the elastic stretchability of serpentine interconnect. Finally, the sensitive parameters affecting the elastic stretchability and resistance of serpentine interconnect are optimized by orthogonal experiment. The resistance of the optimized flexible and stretchability coil is reduced by 13.5% and the elastic stretchability is increased by 34.3%. The research results provide theoretical guidance for optimal design of flexible and stretchable wireless charging coil.