To improve accuracy of disconnection detection of light emitting elements, regarding a vehicular lighting fixture in which light emitting elements in a light emitting part shift into a light emitting state sequentially according to power supply from an on-vehicle battery.SOLUTION: A light emission drive circuit in a vehicular lighting fixture in which light emitting elements shift into a light emitting state sequentially in a light emitting part having a plurality of light emitting elements according to power supply from an on-vehicle battery includes: a current supply part for supplying a driving current to the light emitting elements in the light emitting part respectively, by receiving a current supplied by a power supply line from the on-vehicle battery; a current consumption part for flowing an adjustment current by consuming part of the power supplied from the power supply line; and a current control part for making the current value of the adjustment current lower as the number of the light emitting elements emitting light in the light emitting part increases.SELECTED DRAWING: Figure 1
【課題】車載バッテリからの電力供給に応じて発光部における発光素子が順に発光状態に遷移していく車両用灯具について、発光素子の断線検知の正確性向上を図る。【解決手段】車載バッテリからの電力供給に応じて複数の発光素子を有する発光部において発光素子が順に発光状態に遷移していく車両用灯具における発光駆動回路であって、車載バッテリからの電力供給ラインを介して供給される電流を受け、発光部におけるそれぞれの発光素子に駆動電流を供給する電流供給部と、電力供給ラインより供給される電力の一部を消費して調整電流を流す電流消費部と、発光部における発光中の発光素子の数が多いほど調整電流の電流値を低くする電流制御部とを備える。【選択図】図1
LIGHT EMISSION DRIVE CIRCUIT, VEHICULAR LIGHTING FIXTURE
発光駆動回路、車両用灯具
10.01.2019
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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