Electronic inverter, particularly for use as ballast

Details Electronic inverter, particularly for use as ballast Electronic inverter, particularly for use as ballast

1984-10-01

1986-12-16

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

315278, 315282, 315DIG7, H05B 4129

Patent

active

046300058

ABSTRACT:
Disclosed is a system for supplying high frequency alternating current to gas discharge lamps, such as fluorescent lamps, and the like and a unit that can be placed in or adjacent to a lighting fixture to convert a direct current supply into high frequency AC and also to provide the ballast needed for operation of the gas discharge lamps. A preferred inverter network includes a symmetrical, class B, push-pull current-limited, tuned-collector, sinusoidal oscillator which is self starting, highly efficient and stable over a wide range of input voltage, with or without load. Circuits are disclosed for dimming the lights, for supplying heating current to lamp filaments at high voltage at the start and much reduced voltage after the arc has been struck in the lamps served by the ballast unit, and this reduction in filament current takes place automatically without switches, resistors or other expensive and energy consuming means.

REFERENCES:
patent: 4184128 (1980-01-01), Nilssen
patent: 4388562 (1983-06-01), Josephson
patent: 4484108 (1984-11-01), Stupp et al.
"Philips High-Frequency Electronic Ballasts and Lamps for Energy Saving and Comfort in Modern Lighting Installations," (IE Publication 458, Aug. 8, 1983).

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