Electric balance with synthetic PID control signal

Details Electric balance with synthetic PID control signal Electric balance with synthetic PID control signal

2007-06-05

2007-06-05

Gibson, Randy W. (Department: 2841)

Weighing scales

Self-positioning

Electrical current generating or modifying

C177S212000, C702S101000

Reexamination Certificate

active

11034610

ABSTRACT:
In electronic balance, an analog computation portion determines at least a differential control signal according to an amount of displacement of a beam. A digital computation portion determines at least an integral control signal is determined by after the amount of displacement of the beam is digital-converted. The control signal component determined by the digital computation portion is analog-converted. Thereafter, a synthetic PID control signal is determined by being synthesized from a resultant signal and the control signal component, which is determined by the analog computation portion. Subsequently, a coil current based on the synthetic PID control signal is passed through the coil. A weight value is obtained according to the control signal component determined by the digital computation portion.

REFERENCES:
patent: 5115877 (1992-05-01), Komoto
patent: 6774319 (2004-08-01), Aoki et al.
patent: 1098196 (1995-02-01), None
patent: 3-170818 (1991-07-01), None
patent: 9-005147 (1997-01-01), None
patent: 10-019642 (1998-01-01), None

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