Load detector circuit

Details Load detector circuit Load detector circuit

1989-07-10

1990-08-28

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

7386267, G01G 314, G01L 122

Patent

active

049517651

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.

REFERENCES:
patent: Re32631 (1988-03-01), Layer
patent: 4241801 (1980-12-01), Kushmuk

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