Capacitance measuring circuit for a capacitive sensor

Details Capacitance measuring circuit for a capacitive sensor Capacitance measuring circuit for a capacitive sensor

G - Physics

01

R

G01R 27/26 (2006.01) G01D 5/24 (2006.01) G01D 5/241 (2006.01) G01H 11/06 (2006.01) G01N 27/22 (2006.01)

Patent

CA 2255225

The circuit and the method are for measuring a capacitance of a capacitive sensor. According to the method, a charging circuit charges the capacitive sensor with a voltage and a discharging circuit discharges the capacitive sensor. A trigger circuit triggers the charging circuit and the discharging circuit in alternation into play as a potential of the capacitive sensor drops and rises to predetermined lower and upper levels respectively. An output circuit provides a signal having a low level during operation of one of the charging and discharging circuit and a high level during operation of theother one of the charging and discharging circuit. The signal has a period defined by a same level repetition which is indicative of the capacitance of thecapacitive sensor.

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