Capacitance-to-voltage transformation circuit

Details Capacitance-to-voltage transformation circuit Capacitance-to-voltage transformation circuit

1977-05-04

1979-04-10

Shoop, William M.

Electric power conversion systems

Current conversion

With voltage multiplication means

324 60CD, H02M 700

Patent

active

041492315

ABSTRACT:
A capacitance-to-voltage transformation circuit for providing an output voltage proportional to capacitive variations includes a variable capacitor, a reference voltage source, and circuit means for charging the variable capacitor to the reference potential. A switch means alternately connects the variable capacitor to the charging means and to ground at a cyclical rate determined by an oscillator clock. An impedance means coupled between the charging and switch means, develops a voltage drop thereacross of a magnitude directly proportional to capacitance variations of the variable capacitor.
In accordance with another aspect of the invention, the circuit includes a compensating means for nullifying any fixed capacitance component of the variable capacitor.

REFERENCES:
patent: 3452272 (1969-06-01), Collins et al.
patent: 3453535 (1969-07-01), Anglin
patent: 3656000 (1972-04-01), Neathery, Jr.
patent: 3886447 (1975-05-01), Tanaka
patent: 3947760 (1976-03-01), Noguchi et al.
patent: 4001676 (1977-01-01), Hile et al.
patent: 4040041 (1977-08-01), Fletcher et al.

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