Capacitance detection apparatus
US7015705B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2004 |
| Grant date | Mar 21, 2006 |
| Priority date | — |
| Expiry date | Sep 29, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960715
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A capacitance detection apparatus includes a first open/close switch provided between both ends of a standard capacitor, one end of the standard capacitor being connected to a first voltage source, a second open/close switch provided between one end of a first capacitor to be measured and the other end of the standard capacitor, the other end of the first capacitor to be measured being connected to a second voltage source or free space, a third open/close switch provided between both ends of the first capacitor to be measured, a voltage measurement means for measuring voltage of the other end of the standard capacitor, a switch control means for performing a first switching control performing a first switching operation to open the first open/close switch after closing thereof, performing a second switching operation to open the second open/close switch after closing thereof, and a third switching operation to close the third open/close switch after closing thereof, wherein the second and third switching operations are repeatedly performed after the first switching operation, a counting means for counting the number of repetition of the second switching operation, and a judging mea…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.