Three-phase electronic ballast
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United States of America Patent
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Jun 14, 2005
Grant Date -
Mar 31, 2005
app pub date -
Sep 29, 2003
filing date -
Sep 29, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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