An impedance measurement circuit for determining a complex impedance of a capacitive sensor having at least one sense electrode operable in loading mode and at least one guard electrode. The measurement circuit includes: a pulse generator unit for providing a periodic electric measurement signal and a periodic electric guard signal; a signal sensing circuit for sensing a sense current flowing through the at least one sense electrode or the sense electrodes in response to the pulse generator unit measurement signal; and a control and evaluation unit. The control and evaluation unit is configured for determining a complex impedance from the determined sense currents with reference to a complex reference potential.


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    Title :

    LOW-COST, HIGH MEASUREMENT SPEED CAPACITIVE SENSING CIRCUIT FOR LOADING MODE OPERATION OF CAPACITIVE SENSORS


    Contributors:

    Publication date :

    2024-01-04


    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 / H03K PULSE TECHNIQUE , Impulstechnik



    LOW-COST, PROTECTED CAPACITIVE SENSING CIRCUIT FOR LOADING MODE OPERATION OF CAPACITIVE SENSORS EMPLOYING HEATER MEMBERS

    LAMESCH LAURENT / JUSTINGER TOBIAS / PUETZ MICHAEL et al. | European Patent Office | 2022

    Free access

    LOW-COST, PROTECTED CAPACITIVE SENSING CIRCUIT FOR LOADING MODE OPERATION OF CAPACITIVE SENSORS EMPLOYING HEATER MEMBERS

    LAMESCH LAURENT / JUSTINGER TOBIAS / PUETZ MICHAEL et al. | European Patent Office | 2024

    Free access

    Low-cost, protected capacitive sensing circuit for loading mode operation of capacitive sensors employing heater members

    LAMESCH LAURENT / JUSTINGER TOBIAS / PUETZ MICHAEL et al. | European Patent Office | 2024

    Free access