PORTABLE FLUORESCENT LAMP AND INVERTER THEREFOR

Details PORTABLE FLUORESCENT LAMP AND INVERTER THEREFOR PORTABLE FLUORESCENT LAMP AND INVERTER THEREFOR

1973-05-22

1976-04-27

Miller, J. D.

Buckles, buttons, clasps, etc.

240 106CH, 320 40, H02h 324

Patent

active

039537684

ABSTRACT:
A portable battery-operated fluorescent light with an inverter having a single transistor Class C oscillator and a gapped-core nonsaturating reactor transformer with a parallel capacitance in the secondary circuit to cause the secondary circuit to act as a resonant tank circuit for the oscillator. The lamp is capacitor-ballasted, and the batteries are rechargeable. A large capacitance is connected in parallel with the batteries to decrease effective battery impedance. The light has an automatic shutoff circuit using a zener diode to shut off the inverter when the batteries are discharged to the safe limit and a self-contained constant voltage current-taper charging circuit for the cells, with the same zener diode as a voltage reference. A jam-in lamp socket is shown which allow the lamp to be inserted straight into the socket without rotation, and a method for pulsing the filament at one end of the lamp to improve startup of aging lamps is disclosed.

REFERENCES:
patent: 3435206 (1969-03-01), Swanson
patent: 3443191 (1969-05-01), Medlar
patent: 3445746 (1969-05-01), Delatorre

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