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US 4,243,114 AGranted
Differential capacitor and circuit
OwnerFrans Brouwerinventor
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OwnerFrans Brouwerinventor
Estimating the term…
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.
In a differential capacitor circuit for generating an electrical signal at a variable capacitor plate proportional to the movement of the variable capacitor plate, the improvement comprising a pair of fixed spaced capacitor plates disposed in a generally parallel relationship with respect to one another with the variable capacitor plate being disposed between the fixed plates, and each of the fixed plates having double segments with each segment of a plate being electrically isolated from the other segment of the plate and with the opposite adjacent segments of both plates being connected directly together to form two segment sets to which a reference signal is applied.
In electromechanical apparatus having an electromechanical transducer for generating an electrical signal proportional to the movement of a variable capacitor plate, the improvement comprising a differential capacitor having a pair of fixed spaced capacitor plates disposed in a generally parallel relationship with respect to one another with the variable capacitor plate being disposed between the fixed plates, each of the fixed plates having double segments with each segment of a plate being electrically isolated from the other segment of that plate and with opposite adjacent segments of both plates being electrically connected to one another, a power supply applying an alternating-current voltage to both commonly connected sets of opposite adjacent segments of the two plates, and signal output means connected to the variable capacitor plate generating an alternating-current output signal whose phase and amplitude is responsive to the relative positioning of the variable capacitor plate to the fixed plates.
In electromechanical weighing apparatus having an electromechanical transducer for generating an electrical signal proportional to the movement of a variable capacitor plate in response to the weight of an object being weighed, the improvement comprising a differential capacitor having a pair of fixed spaced capacitor plates disposed in a generally parallel relationship with respect to one another with the variable capacitor plate being disposed between the fixed plates, each of the fixed plates having double segments with each segment of a plate being electrically isolated from the other segment of that plate and with opposite adjacent segments of both plates being electrically connected to one another, a power supply applying an alternating-current voltage to both commonly connected sets of opposite adjacent segments of the two plates, and signal output means connected to the variable capacitor plate generating an alternating-current output signal whose phase and amplitude is responsive to the relative positioning of the variable capacitor plate to the fixed plates and thus to the weight of an object.
Dependencies are inferred from the claim text.