Osram Sylvania Inc.

Richard H Koeppl

Joseph Parisella

Grigoriy A Trestman

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.

Three-phase electronic ballast

A ballast ( &prime;) for powering a plurality of gas discharge lamps ( ) includes a load-adaptable charge pump power factor correction arrangement ( ) for feeding back a high frequency current having a magnitude that is dependent on the number of operating lamps.

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Topsfield, MA, United States of America

Richard H Koeppl