Fluorescent light ballast circuit

Details Fluorescent light ballast circuit Fluorescent light ballast circuit

1995-03-17

1996-10-22

Pascal, Robert

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

315101, 315200R, 315352, 315272, 315203, 315206, 315 DIG5, H05B 4116

Patent

active

055680186

ABSTRACT:
An improved fluorescent light ballast circuit extends the on/off life of a florescent lamp within a lighting circuit having a pair of series connected fluorescent lamps. The ballast circuit includes a DC pulse generation circuit, filtering and voltage regulation circuitry, a step-up voltage transformer, and a current altering circuit which alters the current within selected filaments within the lamps. The current altering circuit includes a diode and a coil winding which connect across a filament within one of the fluorescent lamps. The net effect of the current altering circuit is to increase the voltage supplied across the lamp connected to the current altering circuit so that the voltage levels across both lamps are balanced.

REFERENCES:
patent: 3997814 (1976-12-01), Toho
patent: 4004184 (1977-01-01), Oh
patent: 4122375 (1978-10-01), Studli
patent: 4237403 (1980-12-01), Davis
patent: 4410836 (1983-10-01), Roche
patent: 4906899 (1990-03-01), Hope et al.
patent: 5206563 (1993-04-01), Castelli

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