Starting device for discharge lamp

Details Starting device for discharge lamp Starting device for discharge lamp

1977-07-28

1979-01-16

Smith, Alfred E.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Filament, electric heater, or resistance in shunt with the...

315 73, 315 74, 315283, 315289, 315DIG2, 315DIG5, H01J 744, H05B 4118

Patent

active

041351142

ABSTRACT:
A bimetal switch circuit, which consists of the series combination of a bimetal switch and a fixed resistance, is connected in parallel with a discharge lamp which is connected across an AC power source through an inductive ballast. The bimetal switch has a heating filament which is closed at the normal temperature and opened when heated to high temperatures by the heating filament. The total resistance value R.sub.o (in ohm) of the bimetal switch circuit at the normal temperature is set so as to establish the relation V.sub.s /R.sub.o .ltoreq. 1 with the effective voltage V.sub.s (in volts) of the AC power source. Under such a condition, when the bimetal switch having been once opened at the starting of the discharge lamp is closed again, high-frequency high-voltage pulses are generated across both terminals of the bimetal switch circuit, and the discharge lamp is easily and stably lit up by the high-frequency pulse voltages.

REFERENCES:
patent: 2286789 (1942-06-01), Dench

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