Patents by Inventor Vinhphu Quoc Tran

Vinhphu Quoc Tran 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).

  • Light emitting diode multiphase driver circuit and method
    Patent number: 7439944
    Abstract: A method and a circuit for driving light emitting diodes (LEDs) in multiphase are provided. A string of LEDs divided into groups connected to each other in series is provided. Each group is coupled to ground through separate conductive paths. A phase switch is provided in each conductive path. Increasing the input voltage turn on the string of LEDs, group by group in the sequence downstream the string. To reduce power dissipation, the phase switch of an upstream group is turned off when next downstream group is turned on.
    Type: Grant
    Filed: May 22, 2006
    Date of Patent: October 21, 2008
    Assignee: Lite Style Electronics, LLC
    Inventors: Kimlong Huynh, Vinhphu Quoc Tran
  • Light emitting diode multiphase driver circuit and method
    Patent number: 7081722
    Abstract: A method and a circuit for driving light emitting diodes (LEDs) in multiphase are provided. A string of LEDs divided into groups connected to each other in series is provided. Each group is coupled to ground through separate conductive paths. A phase switch is provided in each conductive path. Increasing the input voltage turn on the string of LEDs, group by group in the sequence downstream the string. To reduce power dissipation, the phase switch of an upstream group is turned off when next downstream group is turned on.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: July 25, 2006
    Inventors: Kimlong Huynh, Vinhphu Quoc Tran