Patents by Inventor Fokko Jan Willem HULSHOF

Fokko Jan Willem HULSHOF 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).

  • LED light source with improved glow reduction
    Patent number: 9967935
    Abstract: The invention relates to a LED light source comprising: input terminals for connection to a mains voltage supply source, a rectifier coupled to the input terminals for rectifying the mains supply voltage supplied by the mains supply voltage source and comprising rectifier output terminals, a DC-DC converter for generating a DC current out of the rectified mains supply voltage, comprising converter input terminals connected to the rectifier output terminals and comprising a first converter output terminal and a second converter output terminal, a LED load with an anode coupled to the first converter output terminal via a first current control element for blocking a current flowing from the anode of the LED load to the first converter output terminal, and with a cathode coupled to the second converter output terminal via a first controllable switch having a control electrode coupled to first control circuitry for rendering the controllable switch non-conductive in case the LED light source is in standby mode
    Type: Grant
    Filed: May 23, 2016
    Date of Patent: May 8, 2018
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Fokko Jan Willem Hulshof, Wilhelmus Josephus Cornelissen
  • LED LIGHT SOURCE WITH IMPROVED GLOW REDUCTION
    Publication number: 20160360588
    Abstract: The invention relates to a LED light source comprising: input terminals for connection to a mains voltage supply source, a rectifier coupled to the input terminals for rectifying the mains supply voltage supplied by the mains supply voltage source and comprising rectifier output terminals, a DC-DC converter for generating a DC current out of the rectified mains supply voltage, comprising converter input terminals connected to the rectifier output terminals and comprising a first converter output terminal and a second converter output terminal, a LED load with an anode coupled to the first converter output terminal via a first current control element for blocking a current flowing from the anode of the LED load to the first converter output terminal, and with a cathode coupled to the second converter output terminal via a first controllable switch having a control electrode coupled to first control circuitry for rendering the controllable switch non-conductive in case the LED light source is in standby mode
    Type: Application
    Filed: May 23, 2016
    Publication date: December 8, 2016
    Inventors: Fokko Jan Willem HULSHOF, Wilhelmus Josephus CORNELISSEN