Ballast circuit with lamp removal protection and soft starting

Details Ballast circuit with lamp removal protection and soft starting Ballast circuit with lamp removal protection and soft starting

1997-05-30

1999-08-03

Pascal, Robert

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

315106, 315127, H05B 4136

Patent

active

059329742

ABSTRACT:
A lamp ballast circuit drives at least one gas discharge illumination device and includes first and second MOS-gated power semiconductor devices connected in a half-bridge configuration and coupled across a d-c supply with a common terminal located at the node between the devices for supplying an output signal to the illumination device. A self-oscillating driver circuit includes respective outputs for driving the power semiconductor devices and has at least one operating voltage supply terminal. When the illumination device fails or is removed, a protection circuit, electrically coupled to the illumination device, removes the operating voltage supplied to the supply terminal. The protection circuit includes a transformer/inductor coupled to the illumination device or a switch that is responsive to the voltage across the illumination device. Additionally, a soft-starting circuit can be provided for gradually increasing the voltage across the illumination device prior to igniting the illumination device.

REFERENCES:
patent: 4481460 (1984-11-01), Kroning et al.
patent: 4562383 (1985-12-01), Kerscher et al.
patent: 4647817 (1987-03-01), Fahnrich et al.
patent: 5574335 (1996-11-01), Sun

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