基于无磁芯方形耦合线圈组和磁阻芯片的电压测量传感器研究OA

A magnetic isolation AC/DC voltage sensor is proposed,which is based on a 4-chip structure of a square coupled coil group without magnetic cores,through simulation of the magnetic field distribution of the square coupled coil group without magnetic cores.While expanding the measurement bandwidth,precise measurement under low current input is achieved.In response to the problem of poor magnetic focusing ability of non magnetic core coil groups and high sensitivity of the chip,which causes sensors to be more sensitive to external interference magnetic fields,a sensor structure combining differential chip groups with differential magnetic fields is proposed,effectively suppressing external magnetic field interference and common mode interference.A prototype is made for experiments,and the experimental results show that the developed magnetic isolation voltage sensor has a measurement bandwidth greater than 25 kHz and an accuracy of 0.42%under low power loss conditions(input current I≤5 mA).