Capacitive sensor for the automotive sector with a charge amplifier
US11356092B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 15, 2020 |
| Grant date | Jun 7, 2022 |
| Priority date | — |
| Expiry date | Feb 19, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/96078
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Capacitive door handle sensor comprising at least one transmission electrode and a reception electrode, an operational amplifier configured as a charge amplifier and connected to the reception electrode, a switch for charge transfer, a first and a second switch for discharging the two operational amplifier inputs and, a capacitor arranged between the output and the inverting input of the operational amplifier, and a control unit for controlling and evaluating the measurement, wherein the control unit comprises a reference potential switching output which is connected to a terminal of the switch and is configured to selectively control a capacitance measurement between the transmission electrodes and the reception electrode or between the reception electrode and ground. Furthermore, methods for setting different operating modes are claimed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.