Electronic ballast with lamp flash protection circuit

Details Electronic ballast with lamp flash protection circuit Electronic ballast with lamp flash protection circuit

1996-05-10

1998-04-14

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315308, 315224, 315219, 315244, 315209R, G05F 100

Patent

active

057396450

ABSTRACT:
A programmed electronic ballast circuit including a voltage maintenance circuit to ensure that the integrated circuit continues to oscillate and drive the half-bridge inverter until the DC bus voltage falls to a level insufficient to permit the fluorescent bulbs at the output to ignite. Additionally, the voltage maintenance circuit drives the voltage of the integrated circuit down to a level whereby proper resetting of the integrated circuit and proper preheating of the florescent bulb filaments is assured.

REFERENCES:
patent: 4350935 (1982-09-01), Spira et al.
patent: 5111118 (1992-05-01), Fellows et al.
patent: 5359274 (1994-10-01), Brandel
patent: 5559395 (1996-09-01), Venkitasubrahmanian et al.
patent: 5569984 (1996-10-01), Holtslag

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