发明名称 Capacitive sensing system configured for using heating element as antenna electrode
摘要 A capacitive sensing system for a heating element comprises a capacitive detector connectable to the heating element and a common mode choke for connecting the heating element with a heating current supply. The detector drives an alternating current into the heating element and produces an output depending on the capacitive load, which the alternating current is subject to. Depending on the object sensed, the load varies in a range between a minimum and a maximum value. The choke represents an inductive load in parallel of the capacitive load. The capacitive load and the inductive load contribute to a complex impedance dominated by the inductive load. A compensation capacitor arranged parallel to the choke represents an additional capacitive load also contributing to the complex impedance. The compensation capacitor is dimensioned such that the sum of additional capacitive load and maximum value amounts to at least 50% of the inductive load.
申请公布号 US2013098890(A1) 申请公布日期 2013.04.25
申请号 US201213623217 申请日期 2012.09.20
申请人 IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A.;IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. 发明人 VIRNICH MICHAEL;HOYER DAVID;THINNES MARTIN;PUETZ MICHAEL;MEYERS THOMAS;LAMESCH LAURENT
分类号 H05B1/00;G01R27/26 主分类号 H05B1/00
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