Circuit and method for evaluating measurement signals and sensor system for capacitively detecting obstacles
US10247580B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 2015 |
| Grant date | Apr 2, 2019 |
| Priority date | — |
| Expiry date | Sep 3, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/96075
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for evaluating measurement signals of at least one sensor with a control circuit. A control signal having a first frequency is generated by a control section of the control circuit, and the control signal is applied to the sensor. An electronic evaluation unit is provided for generating an evaluation signal originating from a measurement signal generated by the sensor. The electronic evaluation unit generates an opposing signal having the first frequency and a modifiable phase angle and superposes the opposing signal and the evaluation signal. The signal resulting from the superposition of the opposing signal and the evaluation signal is fed to a synchronous demodulator of the electronic evaluation unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.