The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 14, 2005
Filed:
Sep. 29, 2003
Grigoriy A. Trestman, Salem, MA (US);
Joseph L. Parisella, Beverly, MA (US);
Richard H. Koeppl, Topsfield, MA (US);
Grigoriy A. Trestman, Salem, MA (US);
Joseph L. Parisella, Beverly, MA (US);
Richard H. Koeppl, Topsfield, MA (US);
Osram Sylvania, Inc., Danvers, MA (US);
Abstract
A ballast () for powering at least one gas discharge lamp () from a three-phase AC voltage source () comprises a three-phase rectifier circuit (), a high frequency filter capacitor (), and a high frequency inverter (). Preferably, three-phase rectifier circuit () is implemented by a six-diode bridge, and high frequency filter capacitor () can be realized by a film capacitor or a ceramic capacitor. Ballast () provides a high power factor and low total harmonic distortion without requiring a dedicated power factor correction circuit. Other benefits of ballast () include enhanced efficiency, longer life, and lower inrush current.