Modified valley fill high power factor correction ballast

Details Modified valley fill high power factor correction ballast Modified valley fill high power factor correction ballast

1995-03-13

1996-05-14

Pascal, Robert J.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315272, 315271, 363 37, 363132, H05B 4116

Patent

active

055170862

ABSTRACT:
A modified valley fill circuit, including a main ballasting inductor for supplying an electrolytic capacitor, has an additional charging winding on the main ballasting inductor for charging the electrolytic capacitor to a predetermined voltage which maximizes the power factor of the input current by optimizing the conduction angle of the input current. In a discharge lamp ballast, the modified valley fill circuit reduces the lamp current crest factor by controlling the frequency with a lamp current control loop.

REFERENCES:
patent: 4862040 (1989-08-01), Nilssen
patent: 4902942 (1990-02-01), El-Hamamsy
patent: 4933605 (1990-06-01), Quazi et al.
patent: 5012161 (1991-04-01), Borowiec et al.
patent: 5387847 (1995-02-01), Wood
patent: 5408403 (1995-04-01), Nerone et al.
"Characteristics of Load Resonant Converters Operated in a High-Power Factor Mode", M J Schutten, R L Steigerwald, M H Kheraluwala, IEEE Transactions on Power Electronics, vol. 7, No. 2, Apr., 1992, pp. 304-314.

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