Patents by Inventor Wihelmus Hinderikus Maria Langeslag

Wihelmus Hinderikus Maria Langeslag 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).

  • Circuit for driving LEDs
    Patent number: 8963431
    Abstract: A circuit is disclosed for driving a plurality of LED strings from an AC supply and arranged to, in use, drive current through a series arrangement of a plurality N of the LED strings when the AC voltage is sufficient to drive the plurality N of the LED strings: the circuit comprising a first current source configured to be switchably connected to a one end of said series arrangement of N LED strings; a series combination of a second current source and a heat dissipater, wherein the series combination of the second current source and the heat dissipater is arranged in parallel with the first current source; and a current balancer for balancing the current through the first current source and the second current source. A driver for such a circuit is also disclosed.
    Type: Grant
    Filed: March 21, 2013
    Date of Patent: February 24, 2015
    Assignee: NXP B.V.
    Inventors: Arjan van den Berg, Jie Chen, Wihelmus Hinderikus Maria Langeslag, Anton Cornelis Blom, Dirk Wouter Johannes Groeneveld