Sequential feedback control system for an electronic ballast

Details Sequential feedback control system for an electronic ballast Sequential feedback control system for an electronic ballast

1996-09-04

1999-10-26

Kinkead, Arnold

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315DIG4, 315DIG5, 315149, 315150, 315360, H05B 3702

Patent

active

059734582

ABSTRACT:
A sequential feedback control system for an electronic ballast provides feedback control during soft start and dimming operations. The system includes a feedback control portion that generates a feedback signal responsive to the power consumption of the ballast and receives a control signal for controlling the power consumption of the ballast. A dimming controller generates a dimming signal responsive to a time signal, and a soft start controller generates a soft start signal responsive to the time signal. An adder generates the control signal by adding the feedback signal and the dimming signal. The dimming controller includes a first resistor for setting the steady state power level during dimming operations and a second resistor for setting the rate of change of the power level.

REFERENCES:
patent: 4791338 (1988-12-01), Dean et al.
patent: 4937504 (1990-06-01), Black, Jr. et al.
patent: 5726534 (1998-03-01), Seo

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