Three-way fluorescent lamp device

Details Three-way fluorescent lamp device Three-way fluorescent lamp device

1984-04-09

1986-06-03

Dixon, Harold A.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Plural cathodes or heaters in the load device

315 72, 315102, 315104, 315290, 315DIG5, H05B 3900

Patent

active

045932310

ABSTRACT:
A ballast circuit for starting and operating a preheat type circular fluorescent lamp, which replaces a multiple wattage incandescent lamp in a three-way incandescent lamp socket, so that the fluorescent lamp can be ignited to function at three different operating wattages. A lamination stacked core structure mounts first and second coils. A passive circuit element, such as positive temperature coefficient resistor also known as a thermistor, is connected in the circuit, which includes a three-way incandescent lamp screw base, for current switching functions to achieve the desired ignition and operating currents for the fluorescent lamp at its different operating wattages.

REFERENCES:
patent: 2278256 (1942-03-01), Frech
patent: 2735961 (1956-02-01), Hamilton
patent: 3975660 (1976-08-01), Knobel et al.
patent: 4348612 (1982-09-01), Morton
patent: 4349768 (1982-09-01), Miller

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