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:
Jan. 21, 2020
Filed:
Jul. 30, 2015
Tridonic Gmbh & CO KG, Dornbirn, AT;
Tridonic Jennersdorf Gmbh, Jennersdorf, AT;
Quentin Lin, Shenzhen Guangdon, CN;
Istvan Bakk, Torokbalint, HU;
TRIDONIC GMBH & CO KG, Dornbirn, AT;
TRIDONIC JENNERSDORF GMBH, Jennersdorf, AT;
Abstract
The invention relates to a direct AC driving circuit and a luminaire for driving at least one LED, the driving circuit comprises a LED string () that comprises a series connection of at least two LEDs, wherein the LED string () is directly powered from a rectified AC mains voltage and a LED string switching unit () that is configured to control at least one LED shortening unit (') that is arranged in parallel to at least one LED of the LED string (′). According to the invention, the driving circuit comprises means configured to provide a low supply voltage (V) which is also derived from the rectified AC mains voltage (), wherein the low supply voltage (V) is generated from unutilized voltage of the LED-string (′).