A fail-safe thin-film current sensor using a flux saturable ring core

Author

Fujiyama, Y. ; Yamada, Y. ; Kikuchi, H. ; Yamaguchi, M. ; Arai, K.I.

Author_Institution

Technol. Res. Lab., Shimadzu Corp., Kyoto, Japan

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3406

Lastpage

3408

Abstract

We have developed a fail-safe thin-film current sensor using a flux saturable ring core. The sensor consists of a transformer unit composed of a saturable core, primary and secondary coils, and a load coil which surrounds the transformer unit. The sensor is suitable for the purpose of a fail-safe system. The chip size is 4 mm×4 mm. A transmission efficiency of 60% was obtained when the carrier signal was 3 Vpp-1 MHz sine wave. The secondary voltage of the sensor successfully dropped by 90% when a 100 mA load current was applied to 20-turn load coil

Keywords

electric current measurement; magnetic cores; magnetic flux; magnetic sensors; magnetic thin film devices; overcurrent protection; relay protection; safety systems; transformers; 60 percent; CoZrNb; electric isolation; fail-safe thin-film current sensor; flux saturable ring core; load coil; overcurrent relays; primary coil; secondary coil; transformer unit; Annealing; Coils; Fabrication; Insulation; Leg; Magnetic films; Magnetic sensors; Polyimides; Sensor systems; Sputtering; Thin film sensors; Transformer cores;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.617959

Filename

617959