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. 20, 2018
Filed:
Dec. 22, 2016
Applicant:
Fairchild Korea Semiconductor Ltd., Bucheon, KR;
Inventors:
Assignee:
Fairchild Korea Semiconductor Ltd., Bucheon, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 33/08 (2006.01); H02J 3/01 (2006.01); H02J 3/18 (2006.01);
U.S. Cl.
CPC ...
H05B 33/0812 (2013.01); H02J 3/01 (2013.01); H02J 3/18 (2013.01);
Abstract
A light emitting diode (LED) lighting circuit includes a ripple reducer. The ripple reducer includes a ripple detector, an adaptive offset generator, and a linear regulator. The ripple detector generates a ripple voltage that is indicative of a ripple current. The adaptive offset generator generates an adaptive offset voltage from the ripple voltage and from a voltage of a transistor. The linear regulator drives the transistor to regulate an LED current in accordance with a reference control voltage that is generated from the ripple voltage and the adaptive offset voltage.