南方电网技术2024，Vol.18Issue(9)：23-30,8.DOI:10.13648/j.cnki.issn1674-0629.2024.09.003
一种隧道磁电阻电流传感器的旁路自校准技术
Bypass Self-Calibration Technique for Tunnel Magnetoresistance Current Sensor
摘要
Abstract
The sensitivity of tunnel magnetoresistance(TMR)current sensor applied in smart power grid is easy to change under the influence of ambient temperature,which will seriously affect the measurement accuracy of TMR current sensor.Based on the basic measurement principle of TMR current sensor,the sensitivity of the sensor chip is analyzed theoretically.Adding a periodic injection DC self-calibration loop below the sensor,the average value of the difference between the output voltage of the sensor before and after injection can be calculated,and the real value of the sensitivity under the current ambient temperature can be tracked and calibrated in real time,and the closed-loop operational control circuit is designed to adjust the sensor in real time.Finally,the DC injection experiment,temperature control experiment and linearity experiment are carried out on the experimental testing platform.The test results prove that bypass self-calibration technology can improve the accuracy and stability of open-loop TMR current sensor measurement.关键词
智能电网/电流传感器/隧道磁电阻/自校准/灵敏度Key words
smart grid/current sensor/tunnel magnetoresistance/self-calibration/sensitivity分类
动力与电气工程引用本文复制引用
王克蔚,喻锟,曾祥君,毕岚溪,刘丰..一种隧道磁电阻电流传感器的旁路自校准技术[J].南方电网技术,2024,18(9):23-30,8.基金项目
国家自然科学基金资助项目(52177070) （52177070）
湖南省自然科学基金资助项目(2021JJ30729) （2021JJ30729）
湖南省教育厅项目(22A0231).Supported by the National Natural Science Foundation of China(52177070) （22A0231）
the National Natural Science Foundation of Hunan Province(2021JJ30729) （2021JJ30729）
Hunan Provincial Education Department Project(22A0231). （22A0231）
