基于弧形线圈结构的无线充电系统能量传输与控制

Power Transfer and Control of Wireless Charging System Based on an Arc Coil Structure

基于磁耦合谐振原理,设计一套基于弧形线圈和二次侧控制的无线充电系统,对水下自主航行器(AUV)无线充电技术有一定的借鉴意义。首先,提出一种可适应AUV特殊圆弧外形且接收端体积小、质量轻的磁耦合装置,利用有限元分析和实际测试对磁耦合装置进行性能分析,得知磁耦合装置具有良好的磁场自约束能力和耦合系数高达0.53的耦合能力;其次,对能量传输与控制系统进行设计和分析,设计系统运行可靠、二次侧独立控制的能量传输和控制拓扑,分析接收侧Buck变换器对充电电压和电流的调节作用,得到占空比与充电电压和电流的关系,并完成闭环环路设计;最后,搭建实验系统对方案进行验证。测试结果表明:该系统可实现对48V电池组(恒流阶段设定11A,恒压阶段设定54.1V)正常充电,系统最大充电功率600W,对应效率88.3%。

This paper develops a wireless charging system using an arc coil and secondary side control method based on magnetically coupled resonance technology,which has certain reference to the wireless charging technology of underwater autonomous vehicle(AUV).Firstly,a magnetic coupler featuring a small-volume and lightweight receiver is proposed that can be adapted to the special arc shape of AUVs.The performance of the magnetic coupler is analyzed by finite element analysis and experiments.It is found that the magnetic coupler has good self-concentrating ability of magnetic field,and the coupling coefficient is high to 0.53.Secondly,the power transfer and control topology with reliable operation and secondary side control is designed,the regulating effect of the Buck converter on the charging voltage and current by the duty cycle is analyzed,and the closed-loop design is completed.Finally,an experimental system is built to verify the proposal.The results show that the 48V battery(11A constant current/54.1V constant voltage)can be charged normally.The maximum charging power of the system is 600W with an efficiency of 88.3%.