Transistor drive scheme for fluorscent lamp ballast

Details Transistor drive scheme for fluorscent lamp ballast Transistor drive scheme for fluorscent lamp ballast

1980-12-19

1982-10-05

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315105, 315277, 315278, 315DIG7, H05B 4129

Patent

active

043530109

ABSTRACT:
An improved drive scheme for a pair of push-pull inverter transistors in an electronic ballast circuit. The inverter output is coupled through a series resonant circuit comprising a capacitor and the primary winding of an output transformer. The resonant circuit is coupled to the inverter output through an additional winding on the primary of an interstage so that a component of the loop current is fed back to the bases of the push-pull transistors, thereby compensating for phase errors in the drive signal applied at the inverter input.

REFERENCES:
patent: 4075476 (1978-02-01), Pitel
patent: 4188661 (1980-02-01), Bower et al.

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