PROBLEM TO BE SOLVED: To provide a lighting circuit capable of performing lighting of a plurality of light sources.SOLUTION: Provided is a lighting circuit 400 for driving a first light source 302 and a second light source 304 connected in series. A bypass switch 430 is provided in parallel with the second light source 304. A constant current circuit 440 is connected in parallel with one of the first light source 302 and the second light source 304. A drive circuit 414 supplies a driving current to a series connection circuit including the first light source 302 and the second light source 304.SELECTED DRAWING: Figure 2
【課題】複数の光源を点灯可能な点灯回路を提供する。【解決手段】直列に接続される第1光源302および第2光源304を駆動する点灯回路400が提供される。バイパススイッチ430は、第2光源304と並列に設けられる。定電流回路440は、第1光源302および第2光源304の一方と並列に接続される。駆動回路414は、第1光源302および第2光源304を含む直列接続回路に駆動電流を供給する。【選択図】図2
LIGHTING CIRCUIT AND VEHICULAR LAMP FIXTURE
点灯回路および車両用灯具
2018-02-15
Patent
Electronic Resource
Japanese
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 |
European Patent Office | 2015
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