PROBLEM TO BE SOLVED: To provide a lighting circuit which is suppressed in an excess current.SOLUTION: The ripple control of a switching converter 14 having constant current output is performed. In a current smoothing circuit 30, an output current Iof the switching converter 14 is smoothed to be supplied to a light source 4. In a protective circuit 40, a target value Iof the output current Iof the switching converter 14 is temporarily reduced when sharp decrease of load voltage Vbetween both ends of the light source 4 is detected.SELECTED DRAWING: Figure 3

    【課題】過電流を抑制した点灯回路を提供する。【解決手段】定電流出力のスイッチングコンバータ14はリップル制御される。電流平滑回路30は、スイッチングコンバータ14の出力電流IOUTを平滑化し、光源4に供給する。保護回路40は、光源4の両端間の負荷電圧VLOADの急峻な低下を検出すると、スイッチングコンバータ14の出力電流IOUTの目標値IREFを一時的に低下させる。【選択図】図3


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    Title :

    LIGHTING CIRCUIT AND LIGHTING APPLIANCE FOR VEHICLE


    Additional title:

    点灯回路および車両用灯具


    Contributors:

    Publication date :

    2018-06-21


    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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