Patents by Inventor Christophe Delcourt

Christophe Delcourt has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • AC/DC converter having a switchable PFC, a controller therfor, and a method of operating a contoller
    Patent number: 8963451
    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.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: February 24, 2015
    Assignee: NXP B.V.
    Inventors: Michel Altheimer, Christophe Delcourt, Frederic Mercier
  • AC/DC CONVERTER HAVING A SWITCHABLE PFC, A CONTROLLER THERFOR, AND A METHOD OF OPERATING A CONTOLLER
    Publication number: 20130057170
    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.
    Type: Application
    Filed: August 30, 2012
    Publication date: March 7, 2013
    Applicant: NXP B.V.
    Inventors: Michel Altheimer, Christophe Delcourt, Frederic Mercier