用于提升无线充电抗偏移能力的磁耦合器最优耦合系数研究  

Study on Optimal Coupling Coefficient of Magnetic Coupler for Improving Anti Drift Ability of Wireless Charging

作　　者：张伟峰 金正军 宋书轩 葛佳蔚 ZHANG Weifeng;JIN Zhengjun;SONG Shuxuan;GE Jiawei(State Grid Hangzhou Power Supply Company,Hangzhou 310016,China;North China Electric Power University,Beijing 102206,China)

机构地区：[1]国网浙江省电力有限公司杭州供电公司,杭州310016 [2]华北电力大学,北京102206

出　　处：《浙江电力》2020年第11期81-87,共7页Zhejiang Electric Power

基　　金：国网浙江省电力有限公司杭州供电公司科技项目(5211HZ1800UM)。

摘　　要：电动汽车无线充电过程中,LCT(磁耦合器)原副边线圈错位会导致无线传输系统功率和效率显著降低。为了提升WPTS(无线充电系统)的抗偏移能力,对比了常见的两线圈和三线圈结构LCT的抗偏移特性,揭示了带中继线圈的三线圈LCT具有较好抗偏移能力;并在原副边线圈位置固定的前提下,提出基于最优耦合系数区间的中继线圈最佳位置确定方法;最后,研制了一台3 kW带中继线圈的WPTS样机并进行实验验证,结果表明在横向偏移150 mm、纵向偏移50 mm情况下,采用最优耦合系数区间的WPTS在满足输出功率前提下效率仍大于90%。文中成果可为研制具有较强抗偏移能力的商用WPTS提供重要理论支撑。In the process of electric vehicle wireless charging,the primary and secondary coil dislocation of magnetic coupler may cause significant reduction of power and efficiency of wireless transmission system.In order to improve the misalignment tolerance ability of WPTS(wireless power transfer system),misalignment tolerances of two-coil and three-coil loosely coupled transformer(LCT)are compared,which reveals that three-coil LCT with intermediate coil has better misalignment tolerance ability;secondly,under the condition of fixed position of primary and secondary coils,the determining method for optimal position of intermediate coil based on the optimal range of coupling coefficient is proposed;finally,a 3 kW WPT prototype with intermediate coil is developed and manufactured,and experimental validation is also performed.The results show that the efficiency of the wireless charging system with the optimal coupling coefficient range is still more than 90%when the lateral offset is 150 mm and the longitudinal offset is 50 mm respectively.The achievement in this paper can provide important theoretical support for the development of commercial WPTS with better misalignment tolerance ability.

关 键 词：无线充电 磁耦合器 最优耦合系数区间 抗偏移能力 

分 类 号：TM724[电气工程—电力系统及自动化]