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:
Jul. 19, 2016
Filed:
Nov. 05, 2012
Richard Landry Gray, Saratoga, CA (US);
Yu Hai Mao, Santa Clara, CA (US);
Richard Landry Gray, Saratoga, CA (US);
Yu Hai Mao, Santa Clara, CA (US);
Beijing EffiLED Opto-Electronics Technology Co., Ltd., Songfangyuan, Shangdixili, Haidian District, Beijing, CN;
Abstract
An approach is provided for devices and methods for driving an LED light, which adjust the numbers of diodes of the LED string corresponding to the rectified AC voltage. The device comprises a power module, a LED string, a current source and a controller. The LED string has multiple LED diodes connected in series that forms a major segment and multiple minor segments. The controller is connected to the current source and the LED string, which selectively shorts the LED diodes of the minor segments. Since the number of LED diodes of the LED string is dynamically adjusted in response to the rectified voltage, the overall 'on' voltage of the LED string is more closely matched to the rectified voltage, and thus the power efficiency is improved.