A method for determining a sense impedance of a guard-sense capacitive sensor operated in loading mode, the sensor having an electrically conductive sense electrode and an electrically conductive guard electrode. The method includes: providing a periodic guard voltage to the guard electrode; sequentially providing periodic reference voltages Vrefi via a reference impedance Zref, to the sense node; for each reference voltage, determining the value Imi of the current applied to the sense node; determining the sense reference voltage Vs to be provided to the sense node, which would lead to a current with an amplitude of zero; and calculating the unknown sense impedance Zx of the sense electrode, with reference to the sense reference voltage Vs, the periodic guard voltage Vg, and the reference impedance Zref.


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    Titel :

    Method for determining a sense impedance in a guard-sense capacitive sensor


    Beteiligte:

    Erscheinungsdatum :

    30.06.2020


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    IPC:    G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60N SEATS SPECIALLY ADAPTED FOR VEHICLES , Sitze besonders für Fahrzeuge ausgebildet / G01D MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE , Anzeigen oder Aufzeichnen in Verbindung mit Messen allgemein



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