Modulated electronic ballast for driving gas discharge lamps

Details Modulated electronic ballast for driving gas discharge lamps Modulated electronic ballast for driving gas discharge lamps

1994-01-31

1996-09-17

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315DIG4, 315DIG5, 315DIG7, 315209R, H05B 3700

Patent

active

055571760

ABSTRACT:
A modulated electronic ballast for driving a gas discharge lamp includes a full wave rectifier for supplying a modulating signal to a series fed parallel resonant circuit including two transistors. Inductors are provided on both the hot and neutral alternating current power source lines for shielding the power source from electromagnetic interference and providing transient protection. A biasing circuit supplies a small direct current to the resonant circuit for retaining the resonant circuit in a continuous oscillating mode during substantially zero voltage valleys of the modulating signal. A diode is provided across the base and collectors of each transistor in the resonant circuit for preventing over saturation and co-conduction. A pair of transistors connected together as a Darlington pair and a selectively variable voltage divider network are provided between the full wave bridge and the resonant circuit for selectively varying the voltage of the modulated signal and thereby selectively dimming the discharge lamps.

REFERENCES:
patent: 3579026 (1971-05-01), Paget
patent: 3593060 (1971-07-01), Kryder
patent: 4277726 (1981-07-01), Burke
patent: 4463286 (1984-07-01), Justice
patent: 4513226 (1985-04-01), Josephson
patent: 4652797 (1987-03-01), Nilssen
patent: 4701671 (1987-10-01), Stupp et al.
patent: 4862040 (1989-08-01), Nilssen
patent: 4926097 (1990-05-01), Taek
patent: 5138234 (1992-08-01), Moisin
patent: 5177408 (1993-01-01), Marques
patent: 5363020 (1994-11-01), Chen et al.
"Baker Clamps", by Warren Schultz, Motorola Semiconductor Products, Inc. Dated before the invention by applicant.

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