Patents by Inventor John E. K. G. De Clercq

John E. K. G. De Clercq 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).

  • Flyback as LED driver
    Patent number: 6304464
    Abstract: The invention relates to a circuit arrangement for operating a semiconductor light source, comprising input terminals for connecting a supply voltage, input filter means, a converter provided with a switching element having a control circuit, and provided with inductive means, and output terminals for connecting the semiconductor light source. The switching element is periodically driven into conduction for a period ton. According to the invention, the converter is formed by a flyback converter, and the inductive means are formed by a transformer, and the control circuit controls the ton.
    Type: Grant
    Filed: July 6, 2000
    Date of Patent: October 16, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Ronny A. A. M. Jacobs, Bertrand J. E. Hontele, John E. K. G. De Clercq, Marcel J. M. Bucks, Engbert B. G. Nijhof
  • Circuit arrangement and signalling light provided with the circuit arrangement
    Patent number: 6147458
    Abstract: A circuit arrangement for operating a semiconductor light source includes connection terminals for connecting a control unit, an input filter, a converter comprising a control circuit, output terminals for connecting the semiconductor light source, an apparatus CM for removing a leakage current occurring in the control unit in the non-conducting state, and a self-regulating circuit for deactivating the apparatus CM. The circuit arrangement is also provided with a detection circuit for detecting an incorrect functioning of the converter or the semiconductor light source. For this purpose, preferably a minimum voltage and a maximum voltage are detected at the output terminals.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: November 14, 2000
    Assignees: U.S. Philips Corporation, Lumileds Lighting B.V.
    Inventors: Marcel J. M. Bucks, Engbert B. G. Nijhof, Johannes E. Algra, John E. K. G. De Clercq, Pieter W. Habing, Stefan E. Roijers