To reduce power consumption in the all-off state.SOLUTION: A lighting circuit 200 drives a light source 300 including multiple light-emitting devices 302 connected in series. Multiple bypass switches SWB are connected in parallel with corresponding light-emitting devices 302, respectively. A converter controller 500 (i) stabilizes a lamp current I, generated from a switching converter 210, to a first target amount Iin the lighting state where at least one of the multiple light-emitting devices 302 is lighted, and (ii) stabilizes the lamp current Ito a second target amount Ismaller than the first target amount Iin the all-off state where all of the multiple light-emitting devices 302 are unlighted.SELECTED DRAWING: Figure 2

    【課題】全消灯状態において消費電力を低減する。【解決手段】点灯回路200は、直列に接続された複数の発光素子302を含む光源300を駆動する。複数のバイパススイッチSWBは、それぞれが対応する発光素子302と並列に接続される。コンバータコントローラ500は、(i)複数の発光素子302の少なくともひとつが点灯する点灯状態において、スイッチングコンバータ210が生成するランプ電流ILAMPを第1目標量IREF1に安定化し、(ii)複数の発光素子302すべてが消灯する全消灯状態において、ランプ電流ILAMPを第1目標量IREF1より少ない第2目標量IREF2に安定化する。【選択図】図2


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    Title :

    LIGHTING FIXTURE FOR VEHICLE AND LIGHTING CIRCUIT OF LIGHT SOURCE


    Additional title:

    車両用灯具および光源の点灯回路


    Contributors:

    Publication date :

    2018-12-20


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    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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