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LIGHTING CIRCUIT OF LIGHTING FIXTURE FOR VEHICLE, LIGHT SOURCE UNIT OF LIGHTING FIXTURE FOR VEHICLE, AND LIGHTING FIXTURE FOR VEHICLE
LIGHTING CIRCUIT OF LIGHTING FIXTURE FOR VEHICLE, LIGHT SOURCE UNIT OF LIGHTING FIXTURE FOR VEHICLE, AND LIGHTING FIXTURE FOR VEHICLE
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机译:车辆用照明灯具的照明电路,车辆用照明灯具的光源单元以及车辆用照明灯具
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摘要
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.
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