High-frequency fluorescent marine light

Details High-frequency fluorescent marine light High-frequency fluorescent marine light

1989-03-10

1990-05-08

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Discharge device load

313110, 313114, 362222, H01J 744

Patent

active

049241478

ABSTRACT:
An indicator lamp has a U-shaped fluorescent bulb having a pair of generally parallel legs and a driving circuit connected to the bulb for energizing same with an alternating-current voltage of a frequency greater than 40 kHz. When the driving frequency lies above 50 kHz and below 100 kHz, preferably between 80 kHz and 90 kHz, it has been found that the generation of spurious radio-frequency signals drops enormously, and in fact the system can normally be turned to generate no r-f interference at all. The driving circuit has an oscillator having a transistor, a trigger having an adjustable transformer and a transistor-controlled help stage connected to the transistor, and an electronic time-constant circuit connected to the trigger. The time-constant circuit includes a resistor and capacitor. The transformer has a primary connected to the oscillator and a secondary connected through the trigger to the bulb. This trigger has a resonance circuit connected to the transformer secondary.

REFERENCES:
patent: 605026 (1898-05-01), DeSpruner-Mertz
patent: 3737651 (1973-06-01), Shute
patent: 3900725 (1975-08-01), Komon

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