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:
Oct. 06, 2015
Filed:
Sep. 14, 2012
Schelte Heeringa, Sneek, NL;
Schelte Heeringa, Sneek, NL;
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Abstract
A LED driver system () comprises a current source () which supplies a power supply current (i) to a parallel arrangement of a parallel switch () and a LED (). The parallel switch () short-circuits the LED () when it is closed. A controller () generates during use: (i) a first control signal (E) to control the current source () to change from a regulating mode wherein the power supply (i) current is regulated to have a non-zero average level into a decaying mode wherein the power supply current (i) decays during a decay period (Td), and (ii) a second control signal (CSO) to control the parallel switch () to open during an open period (To) comprising a sub-period of the decay period (Td).