Current sensor

Details Current sensor Current sensor

2008-07-01

2008-07-01

Hollington, Jermele M (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

Reexamination Certificate

active

11223934

ABSTRACT:
The present invention provides a current sensor capable of adjusting an offset value at a zero magnetic field more easily and detecting a current magnetic field generated by a current to be detected with high sensitivity and high precision. The current sensor has: first and second magnetoresistive elements disposed along a conductor so that resistance values change in directions opposite to each other in accordance with a current magnetic field generated by a current to be detected flowing in the conductor; andfirst and second constant current sources that supply constant currents equal to each other to the first and second magnetoresistive elements, respectively. The current sensor further includes a differential amplifier that detects the difference between voltage drops occurring in the first and second magnetoresistive elements by the constant current. The current to be detected is detected on the basis of the difference between the voltage drops.

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