Patents by Inventor Phillip Whitt

Phillip Whitt 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).

  • Aggregate ignition method in high frequency metal halide lamps
    Patent number: 7919926
    Abstract: A high frequency ballast for a metal halide lamp comprises a controller, a switch, and an oscillator. The controller selectively enables and disables the oscillator via the switch to ignite the lamp. The ignition method includes enabling the oscillator such that the oscillator provides the lamp with a pulse train comprising a rapid series of short ignition pulses, cools for a period of time, and provides an addition pulse train to the lamp if necessary to ignite the lamp. When the lamp ignites, the ballast maintains enablement of the oscillator.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: April 5, 2011
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Andrew Johnsen, Phillip Whitt, Harold Rothwell
  • Ceramic metal halide lamp bi-modal power regulation control
    Patent number: 7863827
    Abstract: A high frequency ballast for a metal halide lamp comprises a controller, a switch, and an oscillator. The controller selectively enables and disables the oscillator via the switch to ignite the lamp. The switch selectively alters an inductance of the inductor to switch between a first frequency of the oscillator and a second frequency of the oscillator different than the first. The controller monitors a current of a power supply loop of the oscillator and a voltage of the oscillator and determines a duty cycle as a function of the monitored voltage and current. The duty cycle is indicative of the percentage of time that the oscillator is to operate at the first frequency versus the second frequency.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: January 4, 2011
    Assignee: Osram Sylvania Inc.
    Inventors: Andrew Johnsen, Phillip Whitt
  • CERAMIC METAL HALIDE LAMP BI-MODAL POWER REGULATION CONTROL
    Publication number: 20090289564
    Abstract: A high frequency ballast for a metal halide lamp comprises a controller, a switch, and an oscillator. The controller selectively enables and disables the oscillator via the switch to ignite the lamp. The switch selectively alters an inductance of the inductor to switch between a first frequency of the oscillator and a second frequency of the oscillator different than the first. The controller monitors a current of a power supply loop of the oscillator and a voltage of the oscillator and determines a duty cycle as a function of the monitored voltage and current. The duty cycle is indicative of the percentage of time that the oscillator is to operate at the first frequency versus the second frequency.
    Type: Application
    Filed: June 30, 2008
    Publication date: November 26, 2009
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Andrew Johnsen, Phillip Whitt
  • AGGREGATE IGNITION METHOD IN HIGH FREQUENCY METAL HALIDE LAMPS
    Publication number: 20090289565
    Abstract: A high frequency ballast for a metal halide lamp comprises a controller, a switch, and an oscillator. The controller selectively enables and disables the oscillator via the switch to ignite the lamp. The ignition method includes enabling the oscillator such that the oscillator provides the lamp with a pulse train comprising a rapid series of short ignition pulses, cools for a period of time, and provides an addition pulse train to the lamp if necessary to ignite the lamp. When the lamp ignites, the ballast maintains enablement of the oscillator.
    Type: Application
    Filed: July 2, 2008
    Publication date: November 26, 2009
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Andrew Johnsen, Phillip Whitt, Harold Rothwell