Headlamp LED lighting apparatus and vehicle headlamp lighting system
AssigneeMitsubishi Electric Corporation
InventorsYu Inoue, Takashi Ohsawa
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Abstract
A headlamp LED lighting apparatus, which lights an LED block 2 having a plurality of LEDs connected in series, samples the output voltage of the headlamp LED lighting apparatus, calculates the average voltage during every prescribed interval, and has a storage unit for storing the average voltage during every prescribed interval calculated. A control circuit 8 compares the voltage variation in the average voltage during every prescribed interval read out of the storage unit with a prescribed threshold, and decides an LED failure of the LED block 2 from a result of the comparison.
Claims16
A headlamp LED lighting apparatus for lighting a headlamp which employs as its light source an LED block having a plurality of LEDs connected in series, the headlamp LED lighting apparatus including a control unit for supplying lighting power to the LED block, the control unit comprising:
- an average processing unit for calculating an average voltage during every prescribed interval by sampling an output voltage for lighting the LED block;
- and
- a storage unit for storing the average voltage during every prescribed interval calculated by the average processing unit, wherein
- the control unit has a function of making a decision of an LED failure of the LED block in accordance with a result of comparing a prescribed threshold with a voltage variation in the average voltage during every prescribed interval read out of the storage unit.
A headlamp LED lighting apparatus including a control unit for lighting a headlamp which employs as its light source an LED block having a plurality of LEDs connected in series, wherein the control unit:
- comprises a function of deciding an LED failure of the LED block;
- and
- stops supplying lighting power to the LED block when deciding that the LED failure occurs in the LED block.
Dependencies are inferred from the claim text.