Battery operated capacitance measurement circuit
US5294889A · kind A · utility
103Cited by
13References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1992 |
| Grant date | Mar 15, 1994 |
| Priority date | — |
| Expiry date | Mar 27, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/2605
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A capacitance measuring circuit uses only a DC voltage source to perform the capacitance measurement. For this purpose, the circuit is arranged to charge an unknown capacitor which is being measured from a DC source and to discharge the capacitor through a constant current circuit such that the discharge voltage across the capacitor decreases linearly from its initial value to a predetermined, final value. The measurement circuit monitors the time taken by the capacitor to discharge in order to determine the capacitance value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.