Power-factor-corrected electronic ballast circuit

Details Power-factor-corrected electronic ballast circuit Power-factor-corrected electronic ballast circuit

1995-06-28

1997-04-15

Pascal, Robert

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315205, 315219, 315224, H05B 4124

Patent

active

056212798

ABSTRACT:
An electronic ballast draws current from the power line with power factor over 90% and total harmonic distortion under 20%, and powers two series-connected 48"/T-12 fluorescent lamps with a 30 kHz current having crest-factor better than 1.7. The ballast includes a power-factor-correcting up-converter and a half-bridge inverter providing a 30 kHz squarewave voltage across a series-resonant high-Q L-C circuit. When the L-C circuit is not loaded, the magnitude of the 30 kHz voltage developing across its tank capacitor is clamped by non-dissipative means to a peak-to-peak magnitude equal to the magnitude of the inverter's DC supply voltage. The ballast output voltage consists of the sum of two components: (i) the 30 kHz voltage across the tank capacitor, and (ii) a 30 kHz voltage obtained from an auxiliary winding on the tank inductor.

REFERENCES:
patent: 4463287 (1984-07-01), Pitel

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