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:
Dec. 01, 2015
Filed:
Sep. 21, 2012
Sharp Kabushiki Kaisha, Osaka-shi, Osaka, JP;
SHARP KABUSHIKI KAISHA, Osaka, JP;
Abstract
This LED lighting device makes a maximum current to minimum current flowing in an LED a target proportion regardless of LED driving circuit performance and without erroneous operation. An LED lighting device () is provided with: an LED circuit () that includes at least one LED (-); a bypass means () inserted in parallel with the LEDs (-); and an LED driving circuit () that supplies current by duty control to the LEDs (-) and the bypass means (). When a prescribed minimum current flows in the LED circuit (), the LED driving circuit () supplies current in which a portion of current flowing in the bypass means () is added to this minimum current and carries out control of the added current by a switching element (TR) connected in series to the LED circuit () and the bypass means ().