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:
Sep. 30, 2014
Filed:
Nov. 29, 2010
Shui-mu Lin, Taichung County, TW;
Chueh-kuei Jan, Hsinchu County, TW;
Shei-chie Yang, Taichung County, TW;
Huan-chien Yang, Pingtung County, TW;
Shui-Mu Lin, Taichung County, TW;
Chueh-Kuei Jan, Hsinchu County, TW;
Shei-Chie Yang, Taichung County, TW;
Huan-Chien Yang, Pingtung County, TW;
Richtek Technology Corp., Hsinchu, TW;
Abstract
An LED driver includes a power converter to convert an input voltage to a regulated voltage, a current source to be connected with an LED string in series between the power converter and a bias node, and a switching circuit to apply a bias voltage to the bias node to set the total voltage drop of the LED string and the current source. By controlling the total voltage drop of the LED string and the current source, the LED driver will automatically select a boost mode or a buck mode for operation, thereby improving the efficiency thereof.