Radio frequency electronic ballast with integrated power factor

Details Radio frequency electronic ballast with integrated power factor Radio frequency electronic ballast with integrated power factor

1998-12-18

2000-08-22

Philogene, Haissa

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315224, 315209R, 315244, 315248, H05B 4116

Patent

active

061077534

ABSTRACT:
An electronic ballast having an RF resonant inverter and RF feedback from the inverter which provides power factor correction. The feedback is provided by a capacitor coupled between an RF resonant tank circuit of the resonant inverter and a low frequency point in the ballast. Such feedback integrates the power factor correction stage with the RF resonant inverter stage and eliminates a switch and its controller. Electronic ballasts operating at RF frequencies require fast switching isolation diodes. Ultra-fast silicon diodes with very short recovery times, which have been used as such isolation diodes, are sensitive to ambient temperature and deteriorate the power factor and total line current harmonic distortion of the ballast. Use of either GaAs or silicon carbide isolation diodes instead of silicon diodes provides the ballast with a high power factor and a low total harmonic distortion.

REFERENCES:
patent: 5142201 (1992-08-01), Wessels
patent: 5371440 (1994-12-01), Liu et al.
patent: 5404082 (1995-04-01), Hernandez et al.
patent: 5406177 (1995-04-01), Nerone
patent: 5446350 (1995-08-01), El-Hamamsy et al.
patent: 5751115 (1998-05-01), Jayaraman et al.
patent: 5798617 (1998-08-01), Moisin
patent: 5917290 (1999-06-01), Shen et al.

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