A capacitance measurement circuit for determining a sense current of a capacitive sensor with a sense electrode and a guard electrode. The measurement circuit includes a periodic signal voltage source, a sense current measurement circuit configured for determining the sense current with reference to a reference voltage, and at least one remotely controllable switch member. In a first switching state, the at least one switch member electrically connects the sense current measurement circuit to the periodic signal voltage source for providing a first reference voltage, and in a second switching state, the at least one switch member electrically connects the sense current measurement circuit to a second reference voltage that is different from the first reference voltage.
CAPACITIVE MEASUREMENT CIRCUIT WITH SENSOR WIRING DIAGNOSTICS
2019-02-14
Patent
Elektronische Ressource
Englisch
CAPACITIVE MEASUREMENT CIRCUIT WITH SENSOR WIRING DIAGNOSTICS
Europäisches Patentamt | 2017
|Capacitive measurement circuit with sensor wiring diagnostics
Europäisches Patentamt | 2020
|CAPACITIVE SENSOR GUARD DIAGNOSTICS FROM REDUNDANT COUPLING MEASUREMENT
Europäisches Patentamt | 2020
|CAPACITIVE SENSOR GUARD DIAGNOSTICS FROM REDUNDANT COUPLING MEASUREMENT
Europäisches Patentamt | 2021
|Capacitive sensor guard diagnostics from redundant coupling measurement
Europäisches Patentamt | 2022
|