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Device and method for evaluating the capacitance of a sensor electrode of a proximity sensor
A method for evaluating a capacitance of a sensor electrode of a proximity sensor includes charging the electrode with a charge voltage. Simultaneously, a compensation capacitance is charged by coupling the compensation capacitance between a reference voltage and ground. The sensor electrode and the compensation capacitance are decoupled from voltage sources and a state of charge of the sensor electrode and of the compensation capacitance is maintained. The sensor electrode is coupled to the compensation capacitance and the charges are balanced; then decoupled from the compensation capacitance and the charge is maintained. The compensation capacitance is then coupled to an evaluation network. The charge of a hold capacitance in the evaluation network is reversed by a charge-reversal current which is dependent on the current flow of the compensation capacitance. The charge of the hold capacitance is evaluated after one or more such cycles.
Device and method for evaluating the capacitance of a sensor electrode of a proximity sensor
A method for evaluating a capacitance of a sensor electrode of a proximity sensor includes charging the electrode with a charge voltage. Simultaneously, a compensation capacitance is charged by coupling the compensation capacitance between a reference voltage and ground. The sensor electrode and the compensation capacitance are decoupled from voltage sources and a state of charge of the sensor electrode and of the compensation capacitance is maintained. The sensor electrode is coupled to the compensation capacitance and the charges are balanced; then decoupled from the compensation capacitance and the charge is maintained. The compensation capacitance is then coupled to an evaluation network. The charge of a hold capacitance in the evaluation network is reversed by a charge-reversal current which is dependent on the current flow of the compensation capacitance. The charge of the hold capacitance is evaluated after one or more such cycles.
Device and method for evaluating the capacitance of a sensor electrode of a proximity sensor
SIEG BERTHOLD (author)
2016-05-31
Patent
Electronic Resource
English
IPC:
G01R
Messen elektrischer Größen
,
MEASURING ELECTRIC VARIABLES
/
E05F
DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION
,
Vorrichtungen zum Bewegen der Flügel in die Offen- oder Schließstellung
/
G01B
MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS
,
Messen der Länge, der Dicke oder ähnlicher linearer Abmessungen
/
G01V
Geophysik
,
GEOPHYSICS
/
H03K
PULSE TECHNIQUE
,
Impulstechnik