PROBLEM TO BE SOLVED: To solve a problem of a conventional lighting fixture system for a vehicle, which semiconductor light-emitting elements may turn off when emitting right.SOLUTION: This invention comprises three semiconductor light-emitting elements 21 to 23, an input voltage monitoring and detecting part 4, a switching element SW, and a linear IC 5. If an input voltage is decreased to or lower than a predetermined voltage (11 V), the input voltage monitoring and detecting part 4 outputs a first detection signal to both the switching element SW and the linear IC 5 at the same time. The switching element SW decreases the number of the semiconductor light-emitting elements that are emitting right from three (21 to 23) to two (21, 22). The linear IC 5 increases current supplied to the semiconductor light-emitting elements from 667 mA to 1000 mA. As the result, if the input voltage is within a voltage variation range (9 to 16 V) of the battery's operation guarantee, this invention maintains the right emission of the semiconductor light-emitting elements 21, 22.
【課題】従来の車両用灯具システムでは、発光状態の複数個の半導体発光素子が消える場合がある。【解決手段】この発明は、3個の半導体発光素子21〜23と、入力電圧監視検出部4と、スイッチ素子SWと、リニアIC5と、を備える。入力電圧が所定電圧値(11V)以下に低下すると、入力電圧監視検出部4は、第1の検出信号を、スイッチ素子SWとリニアIC5とに同時に出力する。スイッチ素子SWは、発光状態の半導体発光素子の個数を3個21〜23から2個21、22に減らす。リニアIC5は、半導体発光素子への供給電流を667mAから1000mAに増やす。この結果、この発明は、入力電圧がバッテリーの動作保証における電圧変化範囲(9V〜16V)内であれば、半導体発光素子21、22の発光状態を維持することができる。【選択図】 図1
LIGHTING CIRCUIT OF LIGHTING FIXTURE FOR VEHICLE, LIGHT SOURCE UNIT OF LIGHTING FIXTURE FOR VEHICLE, AND LIGHTING FIXTURE FOR VEHICLE
車両用灯具の点灯回路、車両用灯具の光源ユニット、車両用灯具
2015-11-12
Patent
Electronic Resource
Japanese
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 / F21S Ortsfeste Leuchten , NON-PORTABLE LIGHTING DEVICES |
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