Gas discharge lamp ballast circuit with compact starting circuit

Details Gas discharge lamp ballast circuit with compact starting circuit Gas discharge lamp ballast circuit with compact starting circuit

1994-04-18

1995-04-11

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315291, 315209R, 315355, 315358, 315DIG7, 315DIG5, G05F 100

Patent

active

054061776

ABSTRACT:
In accordance with the invention, there is provided a ballast circuit for a gas discharge lamp. The circuit comprises means for providing a d.c. bus voltage on a bus conductor with respect to ground. The circuit includes a resonant load circuit incorporating a gas discharge lamp and including first and second resonant impedances whose values determine the operating frequency of the resonant load circuit. Further included is a converter circuit coupled to the resonant load circuit so as to impress a bidirectional voltage thereacross and thereby induce a bidirectional current in the resonant load circuit. The converter comprises first and second switches serially connected between the bus conductor and ground, and having a common node coupled to a first end of the resonant load circuit and through which the bidirectional load current flows. A current-sensing winding senses at least a portion of the current flowing in the resonant load circuit. A feedback arrangement generates a feedback signal in response to current flowing in the current-sensing winding, and regeneratively controls the first and second switches in response to the feedback signal. A starting circuit superimposes a starting current pulse through the current-sensing winding, so as to achieve the regenerative control of the first and second switches.

REFERENCES:
patent: 4603378 (1986-07-01), Virta
patent: 5004960 (1991-04-01), Cockram et al.
patent: 5345148 (1994-09-01), Zeng et al.

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