The drive circuit receives an input voltage, and to supply a drive current ILED stabilized to a target amount IREF to the semiconductor light source. A plurality of bypass switches is respectively connected in parallel to a corresponding part of the plurality of light-emitting elements. The bypass control unit generates phase-shifted gate pulse signals, and controls the bypass switches in correspondence to the gate pulse signals. The bypass control unit changes a duty ratio of each gate pulse signal in correspondence to a target luminance of a corresponding part, and corrects the duty ratio of each gate pulse signal based on the input voltage.


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    Title :

    LIGHTING CIRCUIT AND VEHICLE LAMP


    Contributors:

    Publication date :

    2020-06-11


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    H05B ELECTRIC HEATING , Elektrische Heizung / 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





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