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. 07, 2013
Filed:
Sep. 24, 2010
Minoru Maehara, Matsubara, JP;
Minoru Maehara, Matsubara, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An LED driving circuit includes a dimming control value detection circuit adapted to detect a dimming control value which indicates a ratio of the actual current to be supplied from a current source to the driving circuit during a predetermined time period with respect to a rated current. A control circuit is adapted to regulate the amount of current supplied to one or more LEDs during the predetermined time period to either of the dimming control value squared or the dimming control value cubed times the rated current. The characteristic of light output to the amount of current supplied from the current source during a predetermined time period is therefore made approximate to that of an incandescent bulb.