Three-phase electronic ballast

Details Three-phase electronic ballast Three-phase electronic ballast

2005-06-14

2005-06-14

Vu, David (Department: 2828)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S251000, C315SDIG005, C363S044000

Reexamination Certificate

active

06906474

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.

REFERENCES:
patent: 6043997 (2000-03-01), He et al.
patent: 6343021 (2002-01-01), Williamson
patent: 2004/0085032 (2004-05-01), Eckert

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