PROBLEM TO BE SOLVED: To provide a lighting device capable of effectively suppressing fluctuation of driving current occurring when lighting of a light source is switched.SOLUTION: A lighting device 1 has a DC/DC converter 2 which is connected to a second light source 4B through a first light source 4A, a switch element SW2 for performing the switching operation between a first state for turning on the first light source and a second state for turning on both of the first light source and the second light source, a switching circuit 17 for controlling the switching operation of the switch element, a current control circuit for holding current flowing in the first light source at a predetermined level, and a control circuit 10 which is connected to a switching regulator and temporarily changes the ON-duty or frequency of the switching operation in the switching regulator in synchronism with a light source switching signal from the external.SELECTED DRAWING: Figure 1

    【課題】光源の点灯を切り替えるときに発生する駆動電流の変動を効果的に抑制することができる点灯装置を提供する。【解決手段】点灯装置1は、第1の光源4Aを介して2の光源4Bに接続され、スイッチングレギュレータを有するDC/DCコンバータ2と、第1の光源を点灯させる第1の状態と、第1の光源および第2の光源の両方を点灯させる第2の状態とを切り替えるスイッチ素子SW2と、スイッチ素子の切り替えを制御する切替回路17と、第1の光源を流れる電流を所定レベルに保持する電流制御回路と、スイッチングレギュレータに接続され、外部からの光源切替信号に同期してスイッチングレギュレータにおけるスイッチングのオンデユーティまたは周波数を一時的に変更する制御回路10と、を備える。【選択図】図1


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    Title :

    LIGHTING DEVICE, LUMINAIRE AND VEHICLE


    Additional title:

    点灯装置、照明装置および車両


    Contributors:

    Publication date :

    2016-04-21


    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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