Patent · US Active

Capacitive sensor configured for using heating element as antenna electrode

US10131255B2 · kind B2 · utility

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1References

12Claims

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Assignee

IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. · LU

Inventors

Laurent Lamesch · Reichlange, LU
Michael Virnich · Korlingen, DE
Michael Puetz · Trier, DE

Key dates

Filing date	Dec 19, 2013
Grant date	Nov 20, 2018
Priority date	—
Expiry date	Apr 6, 2034

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB60N2210/12
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A capacitive sensor configured for connection between a heating element and a heating current supply comprises a common mode choke (CMC) for AC-decoupling the heating element from the heating current supply. The CMC comprises first and second inductively coupled windings, the first winding for connection between a first terminal of the heating current supply and a first terminal of the heating element and the second winding for connection between a second terminal of the heating element and a second terminal of the heating current supply. The capacitive sensor further comprises a control and evaluation circuit for injecting an AC signal into the heating element via a measurement node, measuring a voltage on and/or a current across the measurement node, and to derive an impedance between the heating element and a counter electrode from the measurement. The CMC comprises a third winding inductively coupled with the first and second windings, the third winding being operatively coupled with the measurement node.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.