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:
May. 19, 2015
Filed:
May. 23, 2012
Harumi Sakuragi, Tokushima, JP;
Wataru Ogura, Okaya, JP;
Minoru Kitahara, Okaya, JP;
NICHIA CORPORATION, Anan-shi, JP;
Abstract
An LED driving apparatus is provided. The apparatus includes an LED Portion, a charging/discharging capacitor, a capacitor charging and discharging paths, and a capacitor charging constant current portion. The LED driving portioncontrols a current in the LED portion. The capacitoris connected in parallel to the LED portion. The charging and discharging paths are connected to the capacitor whereby charging and discharging the capacitor, respectively. The constant current portionis connected on the charging path and controls a charging current so that the capacitor is charged at a constant current. When rectified voltage applied to the LED portion becomes high, the capacitor is charged with the charging current through the charging path. When the voltage becomes low, the capacitor is discharged at a discharging current through the discharging path so that the discharging current is applied to the LED portion.