A switching circuit includes an active element connected in parallel to a second light source block and having an impedance that varies in accordance with a control signal input into a control terminal, and switches the second light source block between a lit condition and an extinguished condition by switching the active element ON and OFF. The switching circuit adjusts the impedance of the active element so that a current flowing to the active element matches a target value set by a switching control circuit. When the active element is to be switched ON, the switching control circuit varies the target value gradually over time, and therefore an excessive load current can be prevented from flowing while the active element shifts from an OFF condition to an ON condition.


    Access

    Download


    Export, share and cite



    Title :

    Lighting device and vehicle headlamp


    Contributors:

    Publication date :

    2016-05-31


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / F21S Ortsfeste Leuchten , NON-PORTABLE LIGHTING DEVICES / H05B ELECTRIC HEATING , Elektrische Heizung



    LIGHTING CONTROL DEVICE OF VEHICLE HEADLAMP AND VEHICLE HEADLAMP SYSTEM

    HOSHINO SHINYA | European Patent Office | 2016

    Free access

    LIGHTING DEVICE AND VEHICLE HEADLAMP

    European Patent Office | 2016

    Free access

    Lighting control device of vehicle headlamp and vehicle headlamp system

    HOSHINO SHINYA | European Patent Office | 2019

    Free access

    Vehicle headlamp lighting strategy

    MINJEUR PATRICK / LARSEN MICHAEL K | European Patent Office | 2020

    Free access

    Vehicle headlamp lighting unit

    ANZAI TOSHIMICHI | European Patent Office | 2020

    Free access