Patents by Inventor Raghuram Narasimhan

Raghuram Narasimhan 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).

  • LEDS driver
    Patent number: 7262559
    Abstract: The power supply (20) for LEDs provides power to a LED light source (10) having a variable number of LEDs wired in series and/or in parallel. The power supply (20) uses current and voltage feedback to adjust power to the LEDs and provides protection to the LED light source (10). A feedback controller (27) compares sensed current and sensed voltage to a reference signal and generates a feedback signal, which is processed by a power factor corrector (124) to adjust the current flow through the transformer supplying current to the LEDs. A LED control switch (24) clamps a peak of the current to the LEDs to provide further protection to the LED light source (10). A short/open detection circuit (30) indicates any detection of a “LED outage” of the LED light source (10).
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: August 28, 2007
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Ajay Tripathi, Bernd Clauberg, Young-Kee Min, Raghuram Narasimhan, Rohit Khetarpal
  • Leds driver
    Publication number: 20060071614
    Abstract: The power supply (20) for LEDs provides power to a LED light source (10) having a variable number of LEDs wired in series and/or in parallel. The power supply (20) uses current and voltage feedback to adjust power to the LEDs and provides protection to the LED light source (10). A feedback controller (27) compares sensed current and sensed voltage to a reference signal and generates a feedback signal, which is processed by a power factor corrector (124) to adjust the current flow through the transformer supplying current to the LEDs. A LED control switch (24) clamps a peak of the current to the LEDs to provide further protection to the LED light source (10). A short/open detection circuit (30) indicates any detection of a “LED outage” of the LED light source (10).
    Type: Application
    Filed: December 11, 2003
    Publication date: April 6, 2006
    Inventors: Ajay Tripathi, Bernd Clauberg, Young-Kee Min, Raghuram Narasimhan, Rohit Khetarpal