Fluorescent lamp ballast with regulated feedback signal for impr

Details Fluorescent lamp ballast with regulated feedback signal for impr Fluorescent lamp ballast with regulated feedback signal for impr

1993-06-14

1995-02-07

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315205, 315209R, 315227R, 315247, 315307, 315DIG5, H05B 4129, H05B 4136

Patent

active

053878485

ABSTRACT:
A fluorescent lamp ballast having improved power factor by providing high frequency signals fed back to the a.c. side of the ballast rectifier. The feedback signal is regulated by limiting or reducing the voltage gain of the feedback signal based on the level of the unregulated feedback signal or rectified signal, respectively.

REFERENCES:
patent: 4935672 (1990-06-01), Lammers et al.
patent: 5050057 (1991-09-01), Notohara et al.
patent: 5057749 (1991-10-01), Nilssen
patent: 5059867 (1991-10-01), Nerone et al.
patent: 5063331 (1991-11-01), Nostwick
patent: 5223767 (1993-06-01), Kulka

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