To provide a lighting circuit which prevents such erroneous detection that a light source of a turn signal lamp is disconnected.SOLUTION: A lighting circuit 23, which blinks a first light source 24 and a second light source 25 and is applied to a vehicular direction indicator 10, comprises: a first regulator 40 which supplies a prescribed first driving current I1 to the first light source 24 in a first period during which the first light source 24 is turned on and the second light source 25 is not turned on and in a second period during which the first light source 24 and the second light source 25 are turned on, and stops the supply of the first driving current to the first light source 24 in a third period during which the first light source 24 and the second light source 25 are turned off; a second regulator 41 which supplies a prescribed second driving current I2 to the second light source 25 in the second period, and stops the supply of the second driving current to the second light source 25 in the third period, and which is higher in power conversion efficiency than the first regulator 40; and a control circuit 44 which repeatedly controls the second regulator 41 in a prescribed period including the first to third periods.SELECTED DRAWING: Figure 1

    【課題】ターンシグナルランプの光源が断線していると誤って検出されることを防ぐ点灯回路を提供する。【解決手段】第1光源24と、第2光源25とを点滅させる、車両用方向指示灯10に適用される点灯回路23であって、第1光源24を点灯させ第2光源25を点灯させない第1期間と、第1光源24及び第2光源25を点灯させる第2期間とにおいて、第1光源24に所定の第1駆動電流I1を供給し、第1光源24及び第2光源25を消灯させる第3期間において、第1光源24への第1駆動電流の供給を停止する第1レギュレータ40と、第2期間において、第2光源25に所定の第2駆動電流I2を供給し、第3期間において、第2光源25への第2駆動電流の供給を停止する第1レギュレータ40より電力変換効率の高い第2レギュレータ41と、第2レギュレータ41を、第1〜第3期間を含む所定周期で繰り返し制御する制御回路44と、を備える。【選択図】図1


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    Title :

    LIGHTING CIRCUIT, AND VEHICULAR DIRECTION INDICATOR


    Additional title:

    点灯回路、車両用方向指示灯


    Contributors:
    OTA SHINJI (author) / DAIGO SUSUMU (author)

    Publication date :

    2021-08-05


    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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