The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 2003
Filed:
Feb. 05, 2001
Oliver Gremm, Kuernbach, DE;
Abstract
The invention in one embodiment provides a circuit arrangement for a sensor element of a contact switch, in which a high frequency control signal ( ) is applied to the sensor element ( ). The circuit arrangement ( ) has a signal source ( ) for the control signal ( ), a transistor (T), to whose base (B) is applied across a pass filter (R C ) and a voltage divider (C ) the control signal ( ), a resistor (R ) applied to ground ( ) ensuring a certain base current, the transistor collector (C), to which the output signal ( ) is applied, is connected to ground across a capacitor (C ), whilst between the transistor base (B) and ground is located a capacitive sensor element ( ). A preferred application field of the invention is a touch contact switch of a glass ceramic hotplate of an electric cooker.