Capacitive proximity sensor as well as method for capacitive approximation detection
US9442143B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 2012 |
| Grant date | Sep 13, 2016 |
| Priority date | — |
| Expiry date | Sep 16, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960745
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A capacitive proximity sensor has a first sensor electrode and a second sensor electrode, a signal generator for providing a first and a second electric alternating signal, a first load element which comprises a first and a second electric load, in which the first alternating signal by the first load can be fed to the first sensor electrode and the second alternating signal by the second load to the second sensor electrode, and wherein the electric loads each together with the capacitive load to be measured at the respective sensor electrode form a lowpass filter, and a signal processing device, which is coupled with the first sensor electrode and with the second sensor electrode, and which is adapted to form a first measurement value from the push-pull portion of a first electric parameter tapped at the first sensor electrode and a second electric parameter tapped at the second sensor electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.