Electronic ballast with crest factor control

Details Electronic ballast with crest factor control Electronic ballast with crest factor control

1989-09-18

1994-12-20

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315247, 315DIG7, H05B 4129

Patent

active

053748743

ABSTRACT:
A self-oscillating half-bridge inverter is powered from a power-line-operated rectifier means providing a DC supply voltage having a relatively high crest-factor. The inverter is loaded by way of a series-tuned high-Q LC circuit connected across this DC voltage. A pair of fluorescent lamps is series-connected across the tank-capacitor of the LC circuit. Also connected across the DC voltage is an arrangement of three energy-storing capacitors charged in series and discharged in parallel. The crest-factor of the current flowing through the fluorescent lamps is substantially lower than the crest-factor of the DC supply voltage.

REFERENCES:
patent: 4251752 (1981-02-01), Stolz
patent: 4560908 (1985-12-01), Stupp et al.
patent: 4954754 (1990-09-01), Nilssen
patent: 5041766 (1991-08-01), Fiene et al.
patent: 5068573 (1991-11-01), Bruning et al.

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