Differential capacitor and circuit

Details Differential capacitor and circuit Differential capacitor and circuit

1979-03-15

1981-01-06

Hartary, Joseph W.

Weighing scales

Self-positioning

Electrical current generating or modifying

324 61R, 361283, G01G 300

Patent

active

042431140

ABSTRACT:
A weighing scale having a differential capacitor transducer for generating an electrical signal proportional to the movement of a variable capacitor plate. The differential capacitor has a pair of fixed capacitor plates disposed in a parallel, spaced relationship with respect to one another with the variable capacitor plate being symmetrically disposed between the fixed plates. Each of the fixed plates is formed with double segments. Each segment of a plate is electrically isolated from the other segment of that plate and opposite adjacent segments of both plates are electrically connected to one another. A square-wave input voltage is applied between both sets of commonly connected segments. A square-wave output voltage is developed at the variable capacitor plate whose phase and amplitude varies in response to the weight of an object being weighed. Both square-wave input and output voltages are applied to a phase-sensitive discriminator which generates a weight-responsive direct-current voltage across a filter capacitor.

REFERENCES:
patent: 3479588 (1969-11-01), Makow
patent: 3680650 (1972-08-01), Zimmer
patent: 3783374 (1974-01-01), Eide
patent: 4189018 (1980-02-01), Brouwer

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