Direct current power source for an electric discharge lamp

Details Direct current power source for an electric discharge lamp Direct current power source for an electric discharge lamp

H - Electricity

05

B

315/66

H05B 41/36 (2006.01) H05B 35/00 (2006.01) H05B 41/19 (2006.01) H05B 41/392 (2006.01)

Patent

CA 1184238

ABSTRACT OF THE DISCLOSURE A solid-state electronic ballast circuit for supplying direct-current power to an electric discharge vapor lamp is disclosed. The source-drain channel of a Vertical Metal Oxide Semiconductor (VMOS) Field Effect Transistor (FET) is connected in parallel with a fixed ballast resistor, the parallel combi- nation being connected in series with the lamp across a DC source. A resistance network controls the conductivity of a bipolar transistor, which in turn controls the conductivity of the VMOS channel, in response to variations in both lamp voltage and current. The ballast circuit may be manufactured as a part of the lamp bulb assembly, the ballast resistor taking the form of an incandescent lamp filament mounted in the same outer bulb with the vapor lamp arc tube. A variable resistance may be employed to manually adjust the level of illumination delivered by the lamp, or a light-sensitive photo-transistor may be employed to deliver constant illumination.

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