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. 24, 2015
Filed:
Aug. 30, 2012
Ac/dc converter having a switchable pfc, a controller therfor, and a method of operating a contoller
Michel Altheimer, Hermanville sur mer, FR;
Christophe Delcourt, Saint Contest, FR;
Frederic Mercier, Saint Manvieu-Norrey, FR;
Michel Altheimer, Hermanville sur mer, FR;
Christophe Delcourt, Saint Contest, FR;
Frederic Mercier, Saint Manvieu-Norrey, FR;
NXP B.V., Eindhoven, NL;
Abstract
A method of controller an AC/DC to converter is disclosed, the converter having a power factor correction stage and a signal indicative of a required power and operating with a switching cycle having a switching frequency being the inverse of a switching period. The method comprises switching on the PFC stage, in response to a signal indicative of an average switching frequency rising above a first threshold. The method further comprises switching off the PFC stage, in response to the signal indicative of an average switching frequency falling below a second threshold. The method may further comprise switching on the PFC stage, in response to a positive step change in the signal indicative of a required power, and switching off the PFC stage, in response to indicative step change in the signal indicative of a required power. A controller and an AC/DC converter operable according to such a method are also disclosed as is an LED lighting system comprising such a controller.