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:
Apr. 16, 2013
Filed:
Jan. 10, 2011
Takayuki Shimizu, Osaka, JP;
Hirohisa Warita, Osaka, JP;
Atsushi Kanamori, Osaka, JP;
Mitsuru Mariyama, Osaka, JP;
Takayuki Shimizu, Osaka, JP;
Hirohisa Warita, Osaka, JP;
Atsushi Kanamori, Osaka, JP;
Mitsuru Mariyama, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An LED drive circuit in which an alternating voltage is input and an LED is driven, and which can be connected to a phase control dimmer The LED drive circuit is provided with an edge detector for detecting an edge of the output voltage of the phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to the LED; wherein the value of the current extracted from the current feed line by the current extractor is varied in accordance with the detection results of the edge detector.