电工技术学报2024，Vol.39Issue(5)：1256-1269,1283,15.DOI:10.19595/j.cnki.1000-6753.tces.222269
具有可变增益恒压特性的双线圈无线电能传输系统补偿网络设计与分析
Analysis and Design of Compensation Network for Two-Coil Wireless Power Transfer System with Variable Constant Voltage Gain Characteristics
摘要
Abstract
Compared with the multi-coil structure,the two-coil wireless power transfer(WPT)system shows shortcomings in transmission distance and transmission efficiency,but the transmission characteristics of the WPT system can be improved by increasing the order of the compensation network and the active control strategy.Different from the design of compensation network,the research of active control strategy has the problems of large system complexity and high control cost.Therefore,combined with the transformer T network model,this paper proposes a new method for compensating network parameters and transmission characteristics analysis of a two-coil WPT system with variable gain constant voltage characteristics,which lays a research foundation for multi-node WPT technology of sensor networks. Firstly,the equivalent model of transformer T-network is established,and the element parameter expression of S-S two-coil WPT system with constant voltage characteristic is given.Secondly,the new parameters-equivalent coupling coefficient kr and equivalent variable ratio n1 are defined,and a new method for determining the compensation network parameters of SP-S and SP-PS compensation structures with variable gain and constant voltage characteristics is proposed.Then,considering the direct influence of system parasitic resistance on transmission characteristics,the variation trend of voltage gain stability with equivalent parameters under coil offset and frequency oscillation is analyzed,and the optimal equivalent parameter expression under coil offset is derived.Finally,the experimental prototypes of two-coil WPT system with S-S,SP-S and SP-PS compensation structures are built to verify the correctness and effectiveness of the variable gain constant voltage output characteristics and analysis conclusions of the proposed system. Through theoretical analysis and experimental verification,the following conclusions can be drawn:(1)The proposed new design method of two-coil WPT system's compensation network makes the output voltage gain of WPT system meet the target variable ratio,simplifies the parameter design method,increases the degree of freedom of system design,and makes the parameter selection more flexible.(2)The two-coil WPT system under coil offset will increase first and then decrease with the increase of equivalent variable ratio n1,and will also show the same trend with the increase of equivalent coupling coefficient kr.(3)Considering the direct influence of the parasitic resistance of the system on the transmission characteristics,the optimal equivalent parameter expression of WPT system with or without parallel resonant element CL under coil offset is obtained.(4)The transmission efficiency of the steady-state WPT system increases first and then decreases with the increase of 21n,the two-coil WPT system with CL increases first and then decreases with the increase of the equivalent coupling coefficient kr,and the WPT system without CL increases first and then decreases with the increase of 2rk.关键词
无线电能传输/补偿网络/传输效率/线圈偏移/变压器T网络等效模型Key words
Wireless power transfer/compensation network/transmission efficiency/coil offset/transformer T-network equivalent model分类
信息技术与安全科学引用本文复制引用
张鹏飞,龚立娇,马欣欣,杨彤,黄波..具有可变增益恒压特性的双线圈无线电能传输系统补偿网络设计与分析[J].电工技术学报,2024,39(5):1256-1269,1283,15.基金项目
国家自然科学基金地区科学基金项目资助(51867021). （51867021）
