Current sensor system and detection method comprising magetoresi

Details Current sensor system and detection method comprising magetoresi Current sensor system and detection method comprising magetoresi

1992-10-22

1996-10-01

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324252, G01R 3306, G01R 3300

Patent

active

055613667

ABSTRACT:
The object of the present invention is to provide a small precise insulating type current sensor system.
Sensing portion is composed of a magnetoresistance element, a bias conductor, and a current conductor, all of which are arranged on an insulating substrate. Resistance change of the magnetoresistance element is taken into an amplifier, and an output of the amplifier flows as a bias current to the bias conductor. When a current flows in the current conductor, the current causes a magnetic field and the resistance of the magnetoresistance element must be changed. However a feedback of the resistance change by the amplifier changes the bias current and controls the bias current for keeping the magnetic field of the magnetoresistance element at a constant. Accordingly, the insulation type current sensing with a wide range and preferable preciseness without being affected with a hysteresis of the magnetoresistance element and Barkhausen noise became possible.

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patent: 5099830 (1992-03-01), Kishimoto
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