Starting circuit for an electrodeless high intensity discharge l

Details Starting circuit for an electrodeless high intensity discharge l Starting circuit for an electrodeless high intensity discharge l

1991-06-24

1992-06-02

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315344, 313234, H05B 4116

Patent

active

051189968

ABSTRACT:
A passive starting circuit foran electrodeless HID lamp includes a series resonant LC circuit including an inductor of variable impedance coupled in series with the parasitic capacitance between a starting probe and the excitation coil of the lamp, and further including a coupling capacitance for directly coupling the starting circuit to the excitation coil. The coupling capacitance is connected between the high terminal of the excitation coil, or a point in the circuit at approximately the same potential thereof, and a conductive support for holding the lamp and starting probe in a lamp fixture. In this way, the starting voltage is maximized for more efficient and rapid starting. Preferably, the series resonant capacitance of the starting circuit is optimized so that the ballast requires little, if any, retuning after the lamp has started.

REFERENCES:
patent: 4810938 (1989-03-01), Johnson et al.
patent: 4812702 (1989-03-01), Anderson
patent: 4894589 (1990-01-01), Borowiec
patent: 4894590 (1990-01-01), Witting
patent: 4902937 (1990-02-01), Witting
patent: 4972120 (1990-11-01), Witting
patent: 5057750 (1991-10-01), Farrall

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