A lighting circuit 400 drives a light source 310 including N (N represents an integer of 2 or more) multiple light-emitting elements 312 coupled in series. A bypass switch circuit 450 includes N multiple bypass switches 452, each coupled in parallel to a corresponding light-emitting element 312. A constant current driving circuit 440 supplies a driving current stabilized to a target current to the light source 310. A light distribution controller 470 controls the bypass switch circuit 450. For a given light distribution pattern, the duty ratio D(%) is determined for each of the N multiple light-emitting elements. Multiple light-emitting elements are formed as control units having a sum total of duty ratios that is less than 100%. The light distribution controller 470 controls the multiple bypass switches 452 such that the multiple light-emitting elements included in the same control unit are not turned on at the same time.


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    Title :

    LIGHTING CIRCUIT, VEHICLE LAMP, AND DRIVING METHOD FOR LIGHT SOURCE


    Additional title:

    BELEUCHTUNGSSCHALTUNG, FAHRZEUGLAMPE UND VERFAHREN ZUR ANSTEUERUNG EINER LICHTQUELLE
    CIRCUIT D'ÉCLAIRAGE, LAMPE DE VÉHICULE ET PROCÉDÉ DE COMMANDE DE SOURCE DE LUMIÈRE


    Contributors:

    Publication date :

    2020-03-25


    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 / F21S Ortsfeste Leuchten , NON-PORTABLE LIGHTING DEVICES



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