Non-linear voltage measuring implementing capacitor charging tim

Details Non-linear voltage measuring implementing capacitor charging tim Non-linear voltage measuring implementing capacitor charging tim

1994-01-18

1995-12-26

Wieder, Kenneth A.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

324677, 324678, 340636, G01N 2746

Patent

active

054791030

ABSTRACT:
The value of an unknown voltage is measured by applying a time-varying current from a reference voltage source through a resistor to a capacitor thereby to increase the voltage across the capacitor as a function of time, measuring the time Tr required for the voltage across the capacitor to reach a selected reference voltage when current from the reference voltage source is applied to the capacitor, restoring the voltage across the capacitor to its initial state, applying a time varying current from an unknown voltage source through a resistor to the capacitor thereby to increase the voltage across the capacitor as a function of time, measuring the time Tb required for the voltage across the capacitor to reach a selected reference voltage when current from the unknown voltage source is applied to the capacitor and calculating the unknown voltage from the times Tr and Tb. The structure for implementing this process is controlled by a microprocessor and uses relatively low cost components compared to prior art dual slope voltage measuring structures.

REFERENCES:
patent: 3051939 (1962-08-01), Gilbert
patent: 3316547 (1967-04-01), Ammann
patent: 4058808 (1977-11-01), Malaviya
patent: 4621227 (1986-11-01), Venema
patent: 4825147 (1989-04-01), Cook et al.
patent: 4866389 (1989-09-01), Ryan et al.
patent: 5099209 (1992-03-01), Seki et al.
IBM Techical Disclosure Bulletin, entitled "Analog to Digital Converter" by C. H. Propster, Jr., vol. 5, No. 8, Jan. 1963, pp. 51-52.

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