Power factor correction circuit

Details Power factor correction circuit Power factor correction circuit

1989-01-05

1991-04-30

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

363 89, 363126, H05B 4124

Patent

active

050121618

ABSTRACT:
A power factor correction circuit employs a metal oxide varistor in series with a filter capacitor. The varistor provides a low-impedance path for pre-charging the filter capacitor, thus enabling the avoidance of high inrush current to circuit devices, while the filter capacitor energizes the circuit when the capacitor voltage exceeds the AC source voltage. The circuit is insensitive to normal line transients. One application is for use in a gas discharge lamp ballast.

REFERENCES:
patent: 4109307 (1978-08-01), Knoll
patent: 4672528 (1987-06-01), Park et al.
patent: 4683529 (1987-07-01), Bucher
patent: 4801887 (1989-01-01), Wegener
patent: 4812736 (1989-03-01), Albach et al.
patent: 4831508 (1989-05-01), Hunter
patent: 4855890 (1989-08-01), Kammiller
S. A. El-Hamamsy, "Controlled Leakage Transformer for Fluorescent Lamp Ballast Including Integral Ballasting Inductor", Ser. No. 200,881 filed 6/2/88.
J. S. Spangler, "A Power Factor Corrected MOSFET, Multiple Output, Flyback Switching Supply", Proceedings of the 10th International PCI, Chicago, IL, 1985, pp. 19-32.

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