PROBLEM TO BE SOLVED: To provide a lighting circuit capable of detecting an open abnormality.SOLUTION: A lighting circuit 400 drives a light emitting unit 301 including a first light source 302 and a second light source 304 connected to each other serially. A first pin Pis connected to one end of the first light source 302. A second pin Pis connected to a connection node of the first light source 302 and the second light source 304. A third pin Pis connected to one end of the second light source 304. A drive circuit 414 supplies a drive current Ito the light emitting unit 301. A bypass switch 430 and a first resistor Rare provided in parallel between the second pin Pand the third pin P. An abnormality detection circuit 460 detects an abnormality based on a detection voltage Vgenerated between the second pin Pand the third pin Pwhen an ON signal is given to the bypass switch 430.SELECTED DRAWING: Figure 2

    【課題】オープン異常を検出可能な点灯回路を提供する。【解決手段】点灯回路400は、直列に接続される第1光源302および第2光源304を含む発光ユニット301を駆動する。第1ピンP1は、第1光源302の一端と接続される。第2ピンP2は、第1光源302と第2光源304の接続ノードと接続される。第3ピンP3は、第2光源304の一端と接続される。駆動回路414は、発光ユニット301に駆動電流ILAMPを供給する。バイパススイッチ430および第1抵抗R1は、第2ピンP2と第3ピンP3の間に並列に設けられる。異常検出回路460は、バイパススイッチ430にオン信号を与えたときの、第2ピンP2と第3ピンP3の間に生ずる検出電圧VDETにもとづいて異常を検出する。【選択図】図2


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    Title :

    LIGHTING CIRCUIT AND VEHICLE LIGHTING FIXTURE


    Additional title:

    点灯回路および車両用灯具


    Contributors:

    Publication date :

    2018-02-22


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    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 / H05B ELECTRIC HEATING , Elektrische Heizung



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