Ballast circuit for powering gas discharge lamp

Details Ballast circuit for powering gas discharge lamp Ballast circuit for powering gas discharge lamp

1994-12-02

1996-06-18

Gonzalez, Frank

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315311, 315209R, G05F 100

Patent

active

055281117

ABSTRACT:
A ballast for providing a dimmable fluorescent lamp (42) has a potentiometer (46) connected to AC power source (10). The potentiometer (46) is connected to a dimming circuit (44). In response to changes in the resistance of the potentiometer (46), dimming circuit (44) causes the duty cycle of a pulse width modulator (18) to change, thereby dimming the fluorescent lamp (42). A dimming disable circuit (60) disables the dimming circuit (44) when power is initially applied to the ballast (6) so that the lamp (42) will ignite.

REFERENCES:
patent: 3597652 (1971-08-01), Gates
patent: 4508995 (1985-04-01), Gajecki

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