Lamp controller with lamp status detection and safety circuitry

Details Lamp controller with lamp status detection and safety circuitry Lamp controller with lamp status detection and safety circuitry

1995-03-31

1997-07-22

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

315119, 315DIG5, 315277, 307157, 363 50, 363 56, H05B 4114

Patent

active

056506945

ABSTRACT:
A ballast includes safety circuitry which senses lamp status through various phases of ballast operation. According to one feature, the ballast is prevented from supplying an output voltage upon initial energization of the ballast when a lamp is not present at the output terminals. The presence of a filament is sensed via a DC path extending through the filament heater windings of an output transformer. When the DC path is not complete, a control input, for example the power supply input of the ballast controller, is not provided with a voltage to start ballast operation. The DC path is also used to restart the ballast if a defective lamp is replaced with a good one. Over-voltage and capacitive mode detection is also disclosed to shut down ballast output upon lamp failure/removal.

REFERENCES:
patent: 4382212 (1983-05-01), Bay
patent: 4461980 (1984-07-01), Nilssen
patent: 4667131 (1987-05-01), Nilssen
patent: 4952849 (1990-08-01), Fellows et al.
patent: 5089753 (1992-02-01), Mattas

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