Electronic balance with PID circuit

Details Electronic balance with PID circuit Electronic balance with PID circuit

1992-03-20

1993-12-14

Fuller, Benjamin R.

Weighing scales

Self-positioning

Repositioning in response to deflection under load

177210EM, G01G 138, G01G 314

Patent

active

052704971

ABSTRACT:
An electric balance which allows a pulse current to flow through a force coil with pulses having two kinds of duties for each period of control time, and generates an electromagnetic force at the ratio of mixture of these pulses wherein the duties are controlled so as to bring the electromagnetic force into equilibrium with a load weight, thereby enhancing the resolution of pulse current duty and achieving the production of a high-resolution electronic balance at a reduced cost.

REFERENCES:
patent: 4189017 (1980-02-01), Strobel et al.
patent: 4245711 (1981-01-01), Kunz
patent: 4365680 (1982-12-01), Gottstein et al.
patent: 4372406 (1983-02-01), Komoto et al.
patent: 4420055 (1983-12-01), Grutzediek et al.
patent: 4457386 (1984-07-01), Schett et al.
patent: 4487279 (1984-12-01), Komoto
patent: 4549623 (1985-10-01), Baumann
patent: 5115877 (1992-05-01), Komoto
Feedback Control of Dynamic Systems, Franklin et al., .COPYRGT.1987, May, pp. 45-49, 53-68, and 99-118.

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