Fluorescent lamp circuit

Details Fluorescent lamp circuit Fluorescent lamp circuit

1983-06-28

1985-12-17

Moore, David K.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315219, 315106, 315DIG7, 363 19, 363 21, 363131, 339 50S, H05B 4124

Patent

active

045594783

ABSTRACT:
A d.c.-a.c. inverter circuit allows a standard type fluorescent lamp to be operated from a low-voltage source of d.c. power with a high degree of efficiency attributable in part to use of lamp current as base drive current for a power transistor controlling the energization of a transformer primary winding having two mutually connected secondary windings which apply voltages across the lamp through the power transistor. Additional efficiency is achieved by use of a second transistor under time delay control for supplying preheat current to the lamp and turn-on current to the power transistor only during the starting phase of lamp operation.

REFERENCES:
patent: 1951113 (1934-03-01), Wiegand
patent: 3629648 (1971-12-01), Brown et al.
patent: 3720861 (1973-03-01), Kahanic
patent: 4071807 (1978-01-01), Ichinose
patent: 4234823 (1980-11-01), Charlot
patent: 4257088 (1981-03-01), Nilssen

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