Preheat current control circuit based upon the number of lamps d

Details Preheat current control circuit based upon the number of lamps d Preheat current control circuit based upon the number of lamps d

1996-04-24

1998-03-10

Pascal, Robert

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Plural load device systems

315105, 315107, 315308, H05B 3702

Patent

active

057265348

ABSTRACT:
A feedback control system of ballast which has function to detect the number of lamp and is applied to an integrated circuit to control the ballast for a fluorescent lamp etc, and provides the ballast with the feedback control system which can detect the number of lamp, control ballast continuously by means of the n-lamp detector and soft start controller which produce the compensated current from the feedback current and direct link voltage. Therefore, the feedback control system can control the ballast accurately according to the load change such as the change of input voltage, number of lamp.

REFERENCES:
patent: 5550433 (1996-08-01), Tobler

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