Power-factor-controlled electronic ballast

Details Power-factor-controlled electronic ballast Power-factor-controlled electronic ballast

1989-09-11

1991-08-20

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

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

315172, 315173, 315DIG7, 315247, H05B 3702

Patent

active

050417665

ABSTRACT:
A self-oscillating half-bridge inverter is powered from a power-line-operated rectifier means providing a DC voltage with a relatively high ripple content. The inverter is loaded by way of a series-tuned high-Q LC cirucit connected across this DC voltage. A pair of fluorescenet 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; which arrangement results in the current drawn from the power line being of relatively high power factor and low harmonic distortion. Charging current for the energy-storing capacitors is derived from the high frequency current flowing through the LC circuit; and charging occurs only during periods near the peak of the power line voltage. An effect of the charging function is that of improving the crest factor of the current flowing through the fluorescent lamps compared with what it otherwise would have been in view of the high ripple content of the DC voltage.

REFERENCES:
patent: 3628089 (1971-12-01), David
patent: 3629651 (1971-12-01), Irving
patent: 4109307 (1978-08-01), Knoll
patent: 4251752 (1981-02-01), Stolz
patent: 4511823 (1965-04-01), Eaton et al.
patent: 4954754 (1990-09-01), Nilssen

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