Electronic ballast with high-frequency-aided power-factor-correc

Details Electronic ballast with high-frequency-aided power-factor-correc Electronic ballast with high-frequency-aided power-factor-correc

1994-10-20

1995-10-17

Mis, David

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315205, 315219, 315307, 315DIG5, H05B 4129, H05B 4136

Patent

active

054593751

ABSTRACT:
In a power-line-operated current-fed parallel-tuned electronic ballast, power-factor-correction and line current harmonics-reduction are attained by placing a high-frequency inductor as well as a high-frequency voltage source in series with the unfiltered DC output of a bridge rectifier connected with the power line voltage. The unfiltered DC output is then supplied to a filter capacitor through a phase-controlled field-effect transistor, thereby to provide a DC voltage of controllably constant magnitude to the ballast's inverter while at the same time drawing power from the power line with a power factor well over 90% and with a total harmonics content well under 20%. The AC voltage provided from the high-frequency voltage source, which has a peak-to-peak magnitude roughly equal to that of the power line voltage, is represented by a simple auxiliary winding on the ballast's main output transformer; which high-frequency voltage is used for pumping current from the power line, through the bridge rectifier, and to the filter capacitor. The inductance of the high-frequency inductor is determined by the frequency of the ballast's AC output voltage as well as by the maximum amount of power required from the power line.

REFERENCES:
patent: 5422546 (1995-06-01), Nilssen

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