Preconditioner having a digital power factor controller

Details Preconditioner having a digital power factor controller Preconditioner having a digital power factor controller

1998-07-29

2000-10-31

Shingleton, Michael B

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315307, 315224, H05B 3702

Patent

active

061407771

ABSTRACT:
A ballast preconditioner serving as a boost regulator which includes a power factor controller. The preconditioner also includes a capacitor for producing a substantially DC voltage and a switch for controlling the amount of energy stored in the capacitor in response to a switching signal. The power factor controller includes a waveform generator having a look-up table for storing values of at least one waveform. The switching signal produced by the power factor controller is based on the at least one waveform accessed from the look-up table.

REFERENCES:
patent: 4277728 (1981-07-01), Stevens
patent: 5786671 (1998-07-01), Lee
Greenfield et al. "Using Microprocessors and Microcomputers The 6800 Family" 1981, p 10.
"An integrated digital control for electronic lighting", WESCON/97, Conference Proceedings (Cat. No. 97CH36148), Santa Clara, CA, USA, Nov. 4-6, 1997, Abstract.
"An Adaptive Digital Controller for a UnityPower Factor Converter", by A.H. Mitwalli, et al, IEEE Transactions on Power Electronics, vol. 11, No. 2, Mar. 1996.
"Design of Feedback Loop in Unity Power Factor AC to DC Converter", James B. Williams, IEEE, 1989, pp. 959-967.
"Power Factor Correction Control Circuits", Philip C. Todd, PCIM, Oct. 1993, pp. 70-79.

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