摘要
为了降低无线电能传输系统发射端在待机时由于检测接收端线圈存在而产生的能量消耗和电磁干扰,保证系统启动时线圈间的相对位置满足要求,该文提出了一种基于LC自由谐振状态下的检测方法。交变磁场中金属物体产生的涡流效应和磁效应对初级线圈输入阻抗、电感产生影响,且该影响与金属材料的电导率、相对磁导率、相对位置等参数有关,在有限元仿真给出不同金属材料下初级线圈输入电阻、电感变化规律,得出次级线圈中的铁氧体材料不影响初级线圈的输入电阻,且使初级线圈在LC自由谐振状态下频率减小,其减小量与线圈间距有关,有别于其他金属材料。在实验验证中进一步给出线圈间距离测量方法,为系统安全启动提供判断依据。
In order to reduce the energy consumption and electromagnetic interference of the transmitting terminal of the wireless power transmission when receiver coils are detected during the standby state and ensure that relative position between coils can meet requirements when the system is started,a detection method based on LC free resonant state is proposed in this paper.The eddy current effect and magnetic effect produced by metal objects in the alternating magnetic field can affect the input impedance and inductance of primary coils.Besides,the effects are closely related to the electrical conductivity,relative permeability,relative position and other parameters of metal materials.This paper uses finite element simulation to summarize change rules of input resistance and inductance of primary coils when different metal materials are used and comes to the conclusion that ferrite materials in the secondary coil do not affect the input resistance of primary coils.Besides,it can reduce the frequency of primary coils under LC free resonance state.The reduction amount is closely related to coil spacing,which is different from other metal materials.The experimental verification further gives measurement methods to measure the distance between coils,which can provide a judgment basis for the safe start-up of the system.
作者
秦庆磊
王中训
穆鹏华
QIN Qing-lei;WANG Zhong-xun;MU Peng-hua(Institute of Science and Technology for Opto-electronie Information,Yantai University,Yantai 264005,China;Asset and Experiment Management Division,Yantai Institute of Technology,Yantai 264003,China)
出处
《自动化与仪表》
2022年第11期58-63,共6页
Automation & Instrumentation
基金
山东省自然科学基金资助项目(ZR2020QF090)
烟台大学研究生科技创新基金资助项目(CGIFYTU2216)。
关键词
无线电能传输
对位检测
LC自由谐振
线圈间距测量
wireless power transmission
counterpoint detection
LC free harmonic vibration
coil spacing measurement
