Vehicle lighting apparatus
AssigneeKoito Manufacturing Co., Ltd.
InventorsTakanori Namba, Masayasu Ito
Life of this patent
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Abstract
A vehicle lighting apparatus includes a plurality of semiconductor light sources that are connected with each other in series, a switching regulator for supplying an electric power from a power source to each of said plurality of semiconductor light sources, forward voltage detection circuitry for detecting a forward voltage of each of said plurality of semiconductor light sources, and failure detection circuitry for detecting the failure of each of said semiconductor light sources based on the detected value of said forward voltage detection means. A semiconductor light source having a lower forward voltage is connected closer to a reference potential side of said power source among said plurality of semiconductor light sources.
Claims6
A vehicle lighting apparatus comprising:
- a plurality of semiconductor light sources that are connected with each other in series;
- a switching regulator for supplying an electric power from a power source to each of said plurality of semiconductor light sources;
- forward voltage detection means for detecting a forward voltage of each of said plurality of semiconductor light sources;
- and
- failure detection means for detecting the failure of each of said semiconductor light sources based on the detected value of said forward voltage detection means;
- wherein a semiconductor light source having a lower forward voltage is connected closer to a reference potential side of said power source among said plurality of semiconductor light sources.
Dependencies are inferred from the claim text.