Title :
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
fDate :
9/1/1997 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
