Electronic ballast circuit

Details Electronic ballast circuit Electronic ballast circuit

1980-11-06

1983-06-14

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Plural discharge devices and/or rectifiers in the supply...

315DIG5, 315DIG7, 315178, 315195, 315277, 315278, H05B 3700, H05B 3900, H05B 4114

Patent

active

043885624

ABSTRACT:
An electronic ballast circuit for powering a plurality of fluorescent lamps or the like from an unsmoothed DC voltage source includes a sine wave converter operatively connected to receive said DC voltage, for generating a high frequency alternating voltage of sufficient amplitude to power said lamps. The converter comprises a tank circuit and two push-pull transistors connected thereto and a current source capacitively coupled to said tank circuit for providing base drive alternately to each transistor. A lamp filament heater current cancellation circuit reduces power drain once the lamps have turned on.

REFERENCES:
patent: 3754160 (1973-08-01), Jensen
patent: 4004187 (1977-01-01), Walker
patent: 4051413 (1977-09-01), Abadie
patent: 4060751 (1977-11-01), Anderson
patent: 4060752 (1977-11-01), Walker
patent: 4127795 (1978-11-01), Knoll
patent: 4199710 (1980-04-01), Knoll
patent: 4237403 (1980-12-01), Davis
patent: 4245177 (1981-01-01), Schmitz
patent: 4259614 (1981-03-01), Kohler
patent: 4277728 (1981-07-01), Stevens

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