Fluorescent lamp operating device

Details Fluorescent lamp operating device Fluorescent lamp operating device

1986-07-08

1988-05-24

Moore, David K.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Delayed application of the discharge potential

315106, 315107, 315225, 315227R, 315245, 315276, 315DIG5, 315DIG7, H05B 4118, H05B 3617

Patent

active

047468416

ABSTRACT:
A fluorescent lamp operating device having a power supply, a circuit for converting the output power from the power supply into a high-frequency power, a lighting circuit connected to a secondary side of a transformer of the high-frequency power converter circuit to light a fluorescent lamp, a circuit for preheating the filament of the fluorescent lamp, a switch circuit including diodes and at least one transistor connected in series with the fluorescent lamp in the lighting circuit, and a control circuit for turning off the transistor for a predetermined period when the power supply is turned on thereby turning off the lighting circuit to actuate the preheating circuit during this period. The control circuit turns on the transistor at the end of the predetermined period to thereby actuate the lighting circuit.

REFERENCES:
patent: 3978369 (1976-08-01), Imaizumi et al.
patent: 4158793 (1979-06-01), Lewis
patent: 4559478 (1985-12-01), Filler et al.
patent: 4588924 (1986-05-01), Luursema et al.

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