Design of Spatial Magnetic Field Measurement System for Wireless Power Transfer System
摘要
Magnetic coupling resonant wireless power transfer (WPT) technology has become a research hotspot in WPT technology due to its relatively excellent energy transmission performance. In this paper, an alternating magnetic field measurement system based on electromagnetic induction method was designed to study the spatial magnetic field characteristics of a magnetic coupling resonant WPT system. The weak induced electromotive force of the magnetic field is obtained through the thin cylindrical coil wound by the enameled wire. The digital signal of the output electromotive force of the magnetic sensor is obtained through the amplification circuit composed of the instrumentation amplifier and the analog-to-digital conversion circuit, and finally sent to the upper computer for data processing and analyzing through the single-chip microcomputer. A simulation WPT system and magnetic sensor models is established via software to achieve coupling results of the circuit and the magnetic field. Comparing the measurement and simulation results, the designed measurement system has more accurate results with small errors, and can be used for subsequent research on the spatial magnetic field characteristics of WPT systems.