The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 2012
Filed:
Nov. 05, 2009
Takashi Fujino, Tokyo, JP;
Takashi Fujino, Tokyo, JP;
Stanley Electric Co., Ltd., Tokyo, JP;
Abstract
An LED vehicle lighting apparatus including a fail-safe function can supply a plurality of LEDs connected in series with a requisite voltage that is larger than a supply voltage of a battery. The vehicle lighting apparatus can include a DC-DC convertor and a subsidiary feed circuit. The DC-DC convertor can be configured to supply the LEDs with a substantially constant current by a controller. At least one output of the subsidiary feed circuit is connected to an LED in the LEDs, and a switching element can also be connected between the LED and ground. When the controller has a breakdown or trouble, LEDs between the LED and ground can be directly lighted by the battery in accordance with a signal provided by the controller. Thus, the disclosed subject matter can provide various LED lighting apparatuses including a user friendly fail-safe function.