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:
Jul. 14, 2015
Filed:
Jan. 24, 2011
Randolf Kraus, Bretten, DE;
Randolf Kraus, Bretten, DE;
E.G.O. Elektro-Gerätebau GmbH, Oberderdingen, DE;
Abstract
A circuit arrangement for determining a capacitance of a number n of capacitive sensor elements (SE˜SEn) comprises at least one collecting capacitor (CS˜CSm), a reference voltage source (RQ), an evaluation device (AE) connected to the at least one collecting capacitor to evaluate a voltage present at the at least one collecting capacitor, a control unit (MC) for generating at least one control signal (SS˜SSk), and at least one integrated circuit (IC˜ICm) connected to the reference voltage source, the sensor elements, and the at least one collecting capacitor. The at least one integrated circuit comprises a number k of changeover switches (WS˜WSk) responsive to the at least one control signal to connect the respectively associated sensor element to the reference voltage source in a first switching position, and to the at least one collecting capacitor in a second switching position.