无线充电系统实际Litz线绕平面线圈高频电阻分析与计算  

Analysis and calculation of high frequency resistance in non-ideal Litz wire planar coils for wireless power transfer systems

作　　者：薄强 王丽芳[1,2,3] 张玉旺 郭彦杰[1,2,3] 张云[4] BO Qiang;WANG Li-fang;ZHANG Yu-wang;GUO Yan-jie;ZHANG Yun(Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;Key Laboratory of Power Electronics and Electric Drives of Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China;Department of Electrical Engineering, Tsinghua University, Beijing 100084, China)

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院电力电子与电气驱动重点实验室,北京100190 [3]中国科学院大学,北京100049 [4]清华大学电机工程与应用电子技术系,北京100084

出　　处：《电工电能新技术》2022年第4期1-8,共8页Advanced Technology of Electrical Engineering and Energy

基　　金：国家电网公司总部科技项目(5200-202113091A-0-0-00);国家自然科学基金(51807188)。

摘　　要：线圈高频电阻的计算对无线充电系统线圈的优化设计至关重要。实际工程一般采用Litz线来绕制线圈以减小趋肤和邻近损耗,但由于扭绞工艺的影响,实际Litz线的电阻值介于理想Litz线和平行束导线之间。本文首先详细分析Litz线电阻的组成与影响因素;其次,提出采用理想Litz线和平行束导线的电阻来拟合实际Litz线电阻的计算方法,该方法同时考虑了线圈自身结构和不同线圈之间电磁场的相互耦合作用对电阻的影响;最后,采用两类Litz线搭建平面矩形线圈和DD线圈进行实验验证。实验表明,在不同的频率范围内,所提计算方法得出的平面矩形线圈和DD线圈的电阻值与实际测量结果一致,验证了该计算方法的准确性和有效性。The calculation of high frequency resistance of coils is critical to the optimal design for wireless power transfer systems.In practical applications,Litz wire is generally used to wound coils in wireless power transfer systems to reduce skinning and proximity losses,but due to the influence of the fabrication procedure,the resistance of the non-ideal Litz wire is between the resistance of ideal Litz wire and the resistance of parallel strands.Firstly,this paper analyzes the different parts and influencing factors of Litz wire resistance in detail.Secondly,it proposes a calculation method to fit the non-ideal Litz wire resistance by using the resistance of ideal Litz wire and parallel strands,which takes into account the influence of the coil’s own structure and the mutual coupling of electromagnetic fields between different coils on the resistance value.Finally,two types of Litz wire are used to construct the planar rectangular coils and DD coils for experimental verification.The experimental results show that the resistance values of planar rectangular coils and DD coils derived from the proposed calculation method are consistent with the actual measurement results in different frequency ranges,which verifies the accuracy and validity of the proposed calculation method.

关 键 词：无线充电系统 Litz线 平面矩形线圈 DD线圈 高频电阻 电磁耦合 

分 类 号：TM912.9[电气工程—电力电子与电力传动]