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:
Sep. 19, 2017
Filed:
Nov. 12, 2013
Iee International Electronics & Engineering S.a., Echternach, LU;
Laurent Lamesch, Reichlange, LU;
Michael Puetz, Trier, DE;
David Hoyer, Ayl, DE;
Andreas Petereit, Schweich, DE;
Thomas Meyers, Bitburg, DE;
Frank Althaus, Saarbrucken, DE;
Michael Virnich, Korlingen, DE;
IEE International Electronics & Engineering S.A, Echternach, LU;
Abstract
A capacitive occupancy or proximity detector () comprises a heating circuit, an impedance measurement circuit () and a diagnostic circuit. The heating circuit includes a heating element (). The impedance measurement circuit is connected to the heating element so as to measure impedance between the heating element and a node at ground potential. The diagnostic circuit is configured for measuring electrical resistance across the heating circuit and includes a heating current sensor (), configured for sensing a heating current across the heating circuit, a current supply device () for driving a diagnostic current across the heating circuit and a current limiting ground path (), configured for draining the diagnostic current and for blocking the heating current.