Patents by Inventor Richard H. Koeppl

Richard H. Koeppl 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).

  • Three-phase electronic ballast
    Patent number: 6906474
    Abstract: A ballast (10) for powering at least one gas discharge lamp (52) from a three-phase AC voltage source (30) comprises a three-phase rectifier circuit (200), a high frequency filter capacitor (300), and a high frequency inverter (400). Preferably, three-phase rectifier circuit (200) is implemented by a six-diode bridge, and high frequency filter capacitor (300) can be realized by a film capacitor or a ceramic capacitor. Ballast (10) provides a high power factor and low total harmonic distortion without requiring a dedicated power factor correction circuit. Other benefits of ballast (10) include enhanced efficiency, longer life, and lower inrush current.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: June 14, 2005
    Assignee: Osram Sylvania, Inc.
    Inventors: Grigoriy A. Trestman, Joseph L. Parisella, Richard H. Koeppl
  • Electronic ballast with adaptable charge pump power factor correction
    Patent number: 6680587
    Abstract: A ballast (20′) for powering a plurality of gas discharge lamps (12,14,16) includes a load-adaptable charge pump power factor correction arrangement (62,64,66,100,200,300) for feeding back a high frequency current having a magnitude that is dependent on the number of operating lamps.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: January 20, 2004
    Assignee: Osram Sylvania Inc.
    Inventors: Grigoriy A. Trestman, Joseph L. Parisella, Richard H. Koeppl