Load detector circuit
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United States of America Patent
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Aug 28, 1990
Issued Date -
N/A
app pub date -
Jul 10, 1989
filing date -
Jul 16, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Strain gages are attached to respective strain sensing areas of the strain generator of a load cell. Those strain gages which are mounted on expansive sides of the strain generator are connected in series with each other, and those strain gages which are mounted contactive sides of the strain generator are connected in series with each other, forming first and second series-connected circuits. The first and second series-connected circuits are connected in series with each other as a half bridge. A load applied to the strain generator is detected by an output signal produced from the junction between the first and second series-connected circuits. A temperature compensating resistor for compensating for a temperature-dependent change in the output signal due to a change in the temperature of the strain generator is connected in a circuit separate from the half bridge. Gain control is effected to eliminate a change in the output signal from the load detecting circuit based on a change in the resistance of the temperature compensating resistor.
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