Double-core GMI current sensor

Author

Malâtek, Michal ; Ripka, Pavel ; Kraus, Ludêk

Author_Institution

Fac. of Electr. Eng., Czech Tech. Univ., Prague, Czech Republic

Volume

41

Issue

10

fYear

2005

Firstpage

3703

Lastpage

3705

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2005.854810

Filename

1519417