Electric circuit for a capacitive sensor element

Details Electric circuit for a capacitive sensor element Electric circuit for a capacitive sensor element

2008-05-20

2008-05-20

Sherry, Michael (Department: 2836)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C307S129000

Reexamination Certificate

active

07375536

ABSTRACT:
An electric circuit for capacitive sensor elements of a touch switch can be designed as a switch capacitor circuit and van be provided with a micro controller. The sensor elements are provided in sensor branches with a charging capacitor. In addition, a reference branch is provide. It contains a reference capacity and a reference charging capacitor, which have capacities that correspond to those of the sensor branches. By comparing the number of charge transfer processes required to reach the switching threshold in the sensor branch and the reference branch, fluctuations of the supply voltage, and consequently the switching threshold itself, can be compensated for.

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