Patents by Inventor Fatemeh Hamdad

Fatemeh Hamdad 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).

  • Mixed mode control for dimmable fluorescent lamp
    Patent number: 7923939
    Abstract: A mixed mode control for dimmable fluorescent lamp provides a smooth and continuous control of output of the lamp. A load threshold, below which the output of the discharge lamp could not be effectively controlled by the conventional frequency control, is determined. During the dimming of the discharge lamp, when the load is not lower than the load threshold, the conventional frequency control is employed. However, when the load is lower than the load threshold, a complementary duty cycle control is used.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: April 12, 2011
    Assignee: Marvell International Ltd.
    Inventors: Fatemeh Hamdad, Hubertus Notohamiprodjo
  • Mixed mode control for dimmable fluorescent lamp
    Patent number: 7420333
    Abstract: A mixed mode control for dimmable fluorescent lamp provides a smooth and continuous control of output of the lamp. A load threshold, below which the output of the discharge lamp could not be effectively controlled by the conventional frequency control, is determined. During the dimming of the discharge lamp, when the load is not lower than the load threshold, the conventional frequency control is employed. However, when the load is lower than the load threshold, a complementary duty cycle control is used.
    Type: Grant
    Filed: July 1, 2004
    Date of Patent: September 2, 2008
    Assignee: Marvell International Ltd.
    Inventors: Fatemeh Hamdad, Hubertus Notohamiprodjo