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:
Feb. 19, 2019
Filed:
Dec. 11, 2017
Applicant:
Ledvance Gmbh, Garching bei Munich, DE;
Inventors:
Shaoping Chen, Shenzhen Guangdong, CN;
ShiYu Ding, Shenzhen Guangdong, CN;
Hui Ye, Shenzhen Guangdong, CN;
Assignee:
LEDVANCE GMBH, Garching Bei Munchen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 37/00 (2006.01); H05B 33/08 (2006.01); F21Y 103/10 (2016.01); F21Y 115/10 (2016.01); F21K 9/278 (2016.01);
U.S. Cl.
CPC ...
H05B 33/0815 (2013.01); H05B 33/0842 (2013.01); F21K 9/278 (2016.08); F21Y 2103/10 (2016.08); F21Y 2115/10 (2016.08); H05B 33/089 (2013.01);
Abstract
The invention provides a driver circuit, an LED lighting tube and a method for providing a controlled DC output power. An open loop control is used for controlling the DC output power in the case that a voltage of an AC input power is in a first voltage range. A closed loop control is used for controlling the DC output power in the case that the voltage of the AC input power is in a second voltage range.