Electronic ballast circuit for discharge lamps

Details Electronic ballast circuit for discharge lamps Electronic ballast circuit for discharge lamps

1993-11-24

1995-01-03

Neyzari, Ali

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315254, 315307, 315DIG7, H05B 4124

Patent

active

053789644

ABSTRACT:
An electronic ballast circuit for discharge lamps, comprising a power factor enhancing and noise removing circuit for enhancing a power factor of an input AC voltage and removing a noise component therefrom, a rectification circuit for full wave-rectifying and smoothing an output voltage from the power factor enhancing and noise removing circuit to output a DC voltage, a drive voltage supply circuit having a primary winding of a first transformer for limiting current, the drive voltage supply circuit receiving the DC voltage from the rectification circuit, limiting an amount of current to a second transformer and supplying an initial drive voltage to an inverter, the second transformer driving the discharge lamps, a base driving circuit having a secondary winding of the first transformer, the base driving circuit supplying a voltage induced in a third winding of the second transformer and a current induced in the secondary winding of the first transformer as base drive voltage and current to the inverter, and a current control circuit for stabilizing a current induced in the second transformer and then supplied to the discharge lamps, the inverter driving the second transformer in response to the voltages from the rectification circuit and the base driving circuit.

REFERENCES:
patent: 5041766 (1991-08-01), Fiene et al.
patent: 5115347 (1992-05-01), Nilssen

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