Current sensor

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation

Reexamination Certificate

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Reexamination Certificate

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07053600

ABSTRACT:
A current sensor has a Hall element, a differential amplifier that amplifying an output voltage of the Hall element, thus producing a sensor output voltage, and a compensation circuit that compensates for variation in offset voltage of the current sensor. The compensation circuit has a plurality of series-connected diodes each exhibiting specific temperature characteristics based on a gradient of an approximated straight line given by a relationship between a residual Hall voltage of the Hall element at a given temperature and a rate of change in the residual Hall voltage due to temperature change, to produce a compensation voltage in accordance with the temperature characteristics. The compensation voltage is added to the output voltage of the Hall element and input to the differential amplifier.

REFERENCES:
patent: 4687994 (1987-08-01), Fulkerson et al.
patent: 4833406 (1989-05-01), Foster
patent: 5065088 (1991-11-01), Habiro et al.
patent: 2003-014788 (2003-01-01), None

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