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:
Aug. 05, 2008
Filed:
Apr. 27, 2006
Shinichi Sawada, Niigata, JP;
Takayuki Shimizu, Gosen, JP;
Shinichi Sawada, Niigata, JP;
Takayuki Shimizu, Gosen, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
To realize an LED drive circuit capable of feeding equal currents to parallel-connected LED circuits with a simple arrangement, there are provided a current source generating a temporally altering current and a first smoothing capacitor and a second smoothing capacitor, and there are also provided: a first LED circuit, containing one LED or series-connected LEDs, which is connected in parallel with the first smoothing capacitor; and a second LED circuit, containing one LED or series-connected LEDs, which is connected in parallel with the second smoothing capacitor, the drive circuit comprising: a current-dividing coil containing two coils coupled at a tap so that the current generated in the current source flows into the tap; a first reverse current blocking diode connected between an end of the current-dividing coil and an electrode of the first smoothing capacitor; and a second reverse current blocking diode connected between another end of the current-dividing coil and an electrode of the second smoothing capacitor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile