Magnetic sensor
AssigneeAichi Steel Corporation
InventorsYoshinobu Honkura, Michiharu Yamamoto, Yoshiaki Koutani, Kazumasa Sumi, Masaki Mori
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Abstract
A magnetic sensor includes a magnetic sensitive member 11 including an amorphous wire, a detection coil 12 wound around the magnetic sensitive member 11, and a sample-and-hold circuit for detecting a voltage induced in the amorphous wire 11 when a pulse current is interrupted. The sample-and-hold circuit has a sample-and-hold unit B31 and a delay circuit. The sample-and-hold unit B31 includes an electronic switch S31, a capacitor C32, a resistor R32, a resistor R33, and a high-input amplifier A31. The delay circuit includes a resistor R31 connected to a control terminal of the electronic switch S31 and a capacitor C31.
Claims8
A magnetic sensor comprising:
- a magnetic sensitive member whose electromagnetic characteristics vary by the action of an external magnetic field;
- a driving circuit for supplying a current to the magnetic sensitive member;
- a detection coil wound around the magnetic sensitive member;
- and
- a sample-and-hold circuit for measuring an induced voltage value which is the magnitude of voltage induced in the detection coil,
- wherein the sample-and-hold circuit is configured to measure the induced voltage value in synchronization with an interruption of the current performed by the driving circuit.
Dependencies are inferred from the claim text.