A capacitive sensor device configured for being connected between an electric heating member and a heating current supply and for using the electric heating member as an antenna electrode. The sensor device includes a common mode choke for connecting between the heating member and the current supply, and a control and evaluation circuit for determining an electrical impedance between the electric heating member and a counter electrode via a measurement node. The control and evaluation circuit includes: a third winding inductively coupled to the first and second windings of the common mode choke, a periodic signal voltage source directly connected to the third common mode choke winding, an electrical quantity measurement circuit configured to determine an electrical quantity across the measurement node, and an EMI filter network that is connected across a signal input port of the third winding and a reference input port connected to AC ground potential.


    Access

    Download


    Export, share and cite



    Title :

    CAPACITIVE SENSOR DEVICE WITH EMI-ROBUST CAPACITIVE MEASUREMENT CIRCUIT


    Contributors:

    Publication date :

    2018-12-27


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / B60N SEATS SPECIALLY ADAPTED FOR VEHICLES , Sitze besonders für Fahrzeuge ausgebildet / B62D MOTOR VEHICLES , Motorfahrzeuge / H03K PULSE TECHNIQUE , Impulstechnik



    Capacitive sensor device with EMI-robust capacitive measurement circuit

    LAMESCH LAURENT | European Patent Office | 2019

    Free access

    CAPACITIVE SENSOR DEVICE WITH EMI-ROBUST CAPACITIVE MEASUREMENT CIRCUIT

    LAMESCH LAURENT | European Patent Office | 2017

    Free access

    CAPACITIVE MEASUREMENT CIRCUIT WITH SENSOR WIRING DIAGNOSTICS

    LAMESCH LAURENT | European Patent Office | 2019

    Free access

    Capacitive measurement circuit with sensor wiring diagnostics

    LAMESCH LAURENT | European Patent Office | 2020

    Free access

    CAPACITIVE MEASUREMENT CIRCUIT WITH SENSOR WIRING DIAGNOSTICS

    LAMESCH LAURENT | European Patent Office | 2017

    Free access