Evaluation circuit for a capacitive sensor, capacitive sensor, and actuator in a motor vehicle
US10168187B2 · kind B2 · utility
5Cited by
1References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 14, 2016 |
| Grant date | Jan 1, 2019 |
| Priority date | — |
| Expiry date | Sep 14, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960745
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to an evaluation circuit for a capacitive sensor for detecting the distance, speed or position of an object, comprising a reference capacitance and two measuring capacitances, wherein the reference capacitance and the measuring capacitances are supplied with a square-wave voltage via a resistor, and wherein by use of a logic unit a time variable pulse is obtained the duration of which is a measure for the respective measuring capacitance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.