Current sensor circuit
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United States of America Patent
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Nov 12, 1991
Grant Date -
N/A
app pub date -
Jun 26, 1990
filing date -
Sep 22, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A current sensor circuit for measuring by means of a Hall element the magnitude of a magnetic flux obtained in response to an input electric current and for generating a signal corresponding to the result of measurement, wherein a Hall element (2) is driven by a voltage obtained by a voltage follower-type voltage generating unit (4) whose output voltage changes by following a supply voltage, and the voltage obtained by the voltage generating unit is applied as an offset compensating voltage, thereby simplifying the circuit of a Hall element portion. In addition, a forward threshold voltage and a reverse threshold voltage that are used in a forward comparator unit (6) and a reverse comparator unit (8), respectively, are separately generated by a first reference resistor unit (5) and a second reference resistor unit (7), thereby simplifying an adjustment operation at a comparator portion and improving the comparator accuracy.
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