摘要
提出一种仅需单片单轴隧穿磁阻传感器且无需磁芯结构的低成本、非侵入式电流监测微系统。研究论证了磁阻传感器测量线缆电流的基本原理和关键点;设计了具备电缆限位功能的组合式结构,在确保磁场-电流传递关系可靠性的同时,避免了对传统聚磁结构及传感阵列的依赖,确保了测量的便捷和结构简单;设计了高集成度、低功耗的微系统硬件,并基于软件实现了精确测量和校准算法。基于工频市电的电气线路规范搭建了测试环境,开展了性能测试。结果表明,研制的电流监测微系统具有较高的线性度和重复性,在0~8 A测量范围内最大误差为1.5%,可达到国标0.5级标准,具有较好的长期稳定性和抗邻线电流干扰能力,适用于多数居民用电监测场景。
A low-cost non-invasive coreless current monitoring microsystem is proposed for production and living power safety, which is based on a single monaxial tunneling magnetoresistance sensor. The principle and key points for measuring cable current with the magnetoresistance sensor are demonstrated. A detachable package with limit mechanism is designed to ensure the reliability of the measurement transfer relationship with the compact structure and convenient measurement. It does not need the traditional redundant magnetic core or multi sensors. The high integration and low power microsystem hardware are realized. The accurate measurement and calibration algorithms are achieved by software. A test environment is built according to the city power specification. Test results show good linearity and consistency of the developed current monitoring microsystem. A maximum error of 1.5% in the 0~8 A range is verified within the national standard of 0.5 level. It also has good long-time stability and anti-interference ability to adjacent line, which shows the developed microsystem suitable for most residential power monitoring scenarios.
作者
鲁文帅
尤睿
周扬
袁宏永
尤政
Lu Wenshuai;You Rui;Zhou Yang;Yuan Hongyong;You Zheng(Department of Precision Instruments,Tsinghua University,Beijing 100084,China;Beijing Laboratory for Biomedical Detection Technology and Instrument,Beijing 100101,China;School of Electronics Engineering and Computer Science,Peking University,Beijing 100871,China;Department of Engineering Physics,Tsinghua University,Beijing 100084,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2020年第6期1-9,共9页
Chinese Journal of Scientific Instrument
关键词
电流监测
隧穿磁阻
微系统
非侵入检测
无磁芯结构
current monitoring
tunneling magnetoresistance
microsystem
non-invasive detection
coreless structure