Electronic ballast having emitter coupled transistors and bias c

Details Electronic ballast having emitter coupled transistors and bias c Electronic ballast having emitter coupled transistors and bias c

1980-06-23

1984-09-04

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315DIG5, 315DIG2, 315205, 315185R, 331113A, H05B 3702, H05B 3904, H05B 4136

Patent

active

044699883

ABSTRACT:
An electronic ballast for energizing fluorescent lamps comprising a converter including a rectifier and a filter for converting an alternating source voltage into a direct current voltage, a network including first and second switching transistors, a tank circuit having a primary winding of a transformer, a secondary winding of the transformer for providing feedback of a portion of the voltage developed across the tank circuits and a bias circuit coupled between the opposite ends of the secondary winding and the emitters of the transistor for alternatively applying bias to the transistors, the network serving to convert a direct current voltage into an amplified sinusoidal voltage having a high frequency, and fluorescent lamps connected in a series configuration coupled across the primary winding.

REFERENCES:
patent: 3691450 (1972-09-01), Cox
patent: 3769545 (1973-10-01), Crane
patent: 4045711 (1977-08-01), Pitel
patent: 4075476 (1978-02-01), Pitel
patent: 4117377 (1978-09-01), Jimerson et al.
patent: 4237403 (1980-12-01), Davis
patent: 4245177 (1981-01-01), Schmitz
patent: 4277726 (1981-07-01), Burke
patent: 4277728 (1981-07-01), Stevens
patent: 4339690 (1982-07-01), Regan et al.

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