Self-dimming electronic ballast

Details Self-dimming electronic ballast Self-dimming electronic ballast

1994-06-28

1995-03-07

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315307, 315314, 315DIG4, 315DIG7, G05F 100

Patent

active

053961552

ABSTRACT:
A self-dimming electronic ballast for a gas discharge lamp includes a converter having an unregulated boost circuit coupled to a variable frequency inverter having a series resonant, parallel loaded output. The inverter includes a variable frequency driver circuit having a timing circuit for determining the frequency of the driver. A transistor in the timing circuit operates as an inverting amplifer and is controlled by a signal proportional to the voltage of the AC line. The frequency of the inverter increases with decreasing voltage on the AC line. The ballast can be on the same circuit as incandescent lamps and powered by a triac or variac dimmer for dimming both the incandescent and gas discharge lamps.

REFERENCES:
patent: 3514668 (1970-05-01), Johnson et al.
patent: 4017785 (1977-04-01), Perper
patent: 4220896 (1980-09-01), Paice
patent: 4251752 (1981-02-01), Stolz
patent: 4370600 (1983-01-01), Zansky
patent: 4677345 (1987-06-01), Nilssen
patent: 4700113 (1987-10-01), Stupp et al.
patent: 4709188 (1987-11-01), Roberts
patent: 5084653 (1992-01-01), Nilsson
patent: 5172033 (1992-12-01), Smits
patent: 5315214 (1994-05-01), Lesea

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