Electronic ballast with lamp current valley-fill power factor co

Details Electronic ballast with lamp current valley-fill power factor co Electronic ballast with lamp current valley-fill power factor co

1997-01-31

1999-11-30

Shingleton, Michael B.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315DIG7, 315244, 315247, 315307, H05B 3702

Patent

active

059948477

ABSTRACT:
An electronic ballast (10) for powering at least one gas discharge lamp (30) includes a rectifier circuit (100), a line blocking rectifier (220), a bulk capacitor (240), an inverter (300), an output circuit (400), and a charging circuit (500). Charging circuit (500) is coupled between the output circuit (400) and the bulk capacitor (240) and provides operating current to the bulk capacitor (240). Charging circuit (500) also protects lamp life by preventing excessive flow of DC current in the lamp (30) following application of AC power to the ballast (10). In a preferred embodiment, charging circuit (500) includes a DC blocking capacitor (510), a lamp current blocking rectifier (530), and a charging rectifier (540).

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"Modified Valley Fill High Power Factor Electronic Ballast for Compact Fluorescent Lamps," IEEE Transactions on Power ELectronics Authors: Mustansir H. Kheraluwals, Sayed Amr El-Hamamsy Jun., 1995, pp. 10-14.

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