Device for detecting a capacitance variation and capacitive sensor for detecting the presence of a user using such a device
US8570054B2 · kind B2 · utility
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5References
10Claims
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Key dates
| Filing date | May 30, 2006 |
| Grant date | Oct 29, 2013 |
| Priority date | — |
| Expiry date | Jan 25, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2405
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for detecting a variation in the capacitance of a variable capacitive structure, wherein the device generates voltage pulses, charges the variable capacitive structure using the voltage pulses, discharges the variable capacitive structure toward a reference capacitor, detects a voltage threshold across the terminals of the reference capacitor, determines a number of charges and/or discharges of the variable capacitive structure corresponding to the voltage threshold, and detects a variation in the number of charges and/or discharges with respect to a number of charges and/or discharges previously obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.