Solid state electronic ballast system for fluorescent lamps

Details Solid state electronic ballast system for fluorescent lamps Solid state electronic ballast system for fluorescent lamps

1979-05-07

1981-02-17

Smith, Alfred E.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Discharge device and/or rectifier in the primary circuit of...

315208, 315DIG7, H05B 4126, H05B 4129

Patent

active

042517524

ABSTRACT:
An electronic solid state system is provided for starting and operating one or more fluorescent lamps, and which supplies power to the lamps at a relatively high frequency, and at a relatively high power factor. The system includes a circuit which forces the line current to be proportional to the applied input voltage so as to maintain high power factor concomitantly with the removal of flicker by high frequency operation. High power efficiency is achieved through the use of a switching resonant inverter output circuit which is ideally suited to fluorescent lamp applications because of its low harmonic energy content, and because it can accommodate a wide range of resistive loads at high efficiency. The system may also incorporate a dimming circuit for the fluorescent lamps.

REFERENCES:
patent: 3890537 (1975-06-01), Park et al.
patent: 4042856 (1977-08-01), Steigerwald
patent: 4109307 (1978-08-01), Knoll
patent: 4127795 (1978-11-01), Knoll

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