Title :
Double-core GMI current sensor
Author :
Malâtek, Michal ; Ripka, Pavel ; Kraus, Ludêk
Author_Institution :
Fac. of Electr. Eng., Czech Tech. Univ., Prague, Czech Republic
Abstract :
A novel design of the giant magnetoimpedance contactless current sensor is presented. A double-core structure is used in order to improve the temperature stability. The temperature coefficient of sensitivity and offset drift are reduced to one-half compared to the single-core sensor. The linearity error decreases by a factor of three. Further utilization of an ac biasing (up to 200 Hz) of the double-core sensor suppresses the temperature offset drift by a factor of 30 (down to 0.6 mA/K) and increases the open-loop linearity to 0.5% for the 2-A range.
Keywords :
electric sensing devices; giant magnetoresistance; magnetoresistive devices; double-core GMI current sensor; double-core structure; electric sensing devices; giant magnetoimpedance contactless current sensor; giant magnetoresistance; magnetoresistive devices; temperature stability; Amorphous magnetic materials; Linearity; Magnetic cores; Magnetic sensors; Mechanical sensors; Sensor phenomena and characterization; Temperature dependence; Temperature distribution; Temperature sensors; Wounds; Amorphous ribbon; current sensor; giant magnetoimpedance (GMI); temperature stability;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854810
