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.


    Access

    Download


    Export, share and cite



    Title :

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


    Contributors:

    Publication date :

    2020-06-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    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



    METHOD FOR DETERMINING A SENSE IMPEDANCE IN A GUARD-SENSE CAPACITIVE SENSOR

    LAMESCH LAURENT | European Patent Office | 2018

    Free access



    Force sense presentation device, force sense presentation system, and force sense presentation method

    TAKENAKA MIKIO / ONO AKIRA / WATANABE YASUHIRO | European Patent Office | 2021

    Free access

    FORCE SENSE PRESENTATION DEVICE, FORCE SENSE PRESENTATION SYSTEM, AND FORCE SENSE PRESENTATION METHOD

    TAKENAKA MIKIO / ONO AKIRA / WATANABE YASUHIRO | European Patent Office | 2019

    Free access