DEVICE AND METHOD FOR LIGHT SOURCE CONTROL

PROBLEM TO BE SOLVED: To provide a technique capable of providing appropriate luminance, if a short-circuit failure occurs in one of a plurality of light sources.SOLUTION: A microcomputer 900 in a light source control device identifies an LED of a short-circuit failure from among LED 111-116, on the...

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Bibliographic Details
Main Authors YONEOKA ISAO, YAMAMOTO YOSHIHIRO, INOUE HARUHISA, ASAMURA YOSHINORI
Format Patent
LanguageEnglish
Japanese
Published 23.04.2015
Subjects
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
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Summary:PROBLEM TO BE SOLVED: To provide a technique capable of providing appropriate luminance, if a short-circuit failure occurs in one of a plurality of light sources.SOLUTION: A microcomputer 900 in a light source control device identifies an LED of a short-circuit failure from among LED 111-116, on the basis of the detection result of a short circuit detector circuit 200 and a current value detected in current detector circuits 141-146. The microcomputer 900 controls switch elements 121-126 to intercept current supply to the identified LED. The microcomputer 900 also controls a constant current circuit 100 to supply an LED, which is unidentified above, with a current not exceeding a current corresponding to the number of the unidentified LED. 【課題】複数の光源のいずれかに短絡故障が生じても、適切な輝度を提供することが可能な技術を提供することを目的とする。【解決手段】光源制御装置のマイコン９００は、短絡故障検出回路２００の検出結果と、電流検出回路１４１〜１４６で検出された電流量とに基づいて、ＬＥＤ１１１〜１１６の中から短絡故障したＬＥＤを特定する。マイコン９００は、当該特定されたＬＥＤへの電流の供給を、スイッチ素子１２１〜１２６によって遮断する制御を行う。マイコン９００は、当該特定されなかったＬＥＤに、当該特定されなかったＬＥＤの数に応じた電流を超えない電流を、定電流回路１００によって供給する制御を行う。【選択図】図１
Bibliography:Application Number: JP20130214373