PROBLEM TO BE SOLVED: To provide a light emitting element drive device which prevents a ground fault caused by abnormality from being falsely detected when all of light emitting elements are not turned on to prevent a protection measure from being taken for the false detection.SOLUTION: A light emitting element drive device includes: an output voltage supply part which generates an output voltage Vo from an input voltage Vi and supplies the output voltage Vo to a load according to a reset signal generated according to electric current flowing through the load (a series connection body Z1, a switch circuit 400) and a set signal generated according to an anode voltage Vom of the load; a determination part (a comparator COM3, a constant voltage source 9) which determines whether or not there is a possibility of a ground fault caused by abnormality on the basis of the anode voltage Vom of the load; and a signal output part (a signal generation part 10) which outputs a signal indicating that there is the possibility of the ground fault caused by the abnormality to an exterior part when the determination part determines that there is the possibility of the ground fault caused by the abnormality. The output voltage supply part avoids stoppage of the generation of the output voltage Vo which is triggered by the possibility of the ground fault of the abnormality being determined by the determination part.SELECTED DRAWING: Figure 1
【課題】全ての発光素子を点灯させないときに異常による地絡と誤認して保護がかかることを防止できる発光素子駆動装置を提供する。【解決手段】発光駆動装置は、負荷(直列接続体Z1、スイッチ回路400)を流れる電流に応じて生成されるリセット信号及び前記負荷のアノード電圧Vomに応じて生成されるセット信号に応じて、入力電圧Viから出力電圧Voを生成して出力電圧Voを前記負荷に供給する出力電圧供給部と、異常による地絡の可能性の有無を前記負荷のアノード電圧Vomに基づいて判定する判定部(コンパレータCOM3、定電圧源9)と、前記判定部が異常による地絡の可能性があると判定した場合に、異常による地絡の可能性があることを示す信号を外部に出力する信号出力部(信号生成部10)と、を有する。前記出力電圧供給部は、前記判定部が異常による地絡の可能性があると判定したことをトリガとして出力電圧Voの生成停止を実行しない。【選択図】図1
LIGHT EMITTING ELEMENT DRIVE DEVICE, LIGHT EMITTING DEVICE, AND VEHICLE
発光素子駆動装置、発光装置、車両
2016-05-23
Patent
Elektronische Ressource
Japanisch
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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