Starting aid for an electrodeless high intensity discharge lamp

Details Starting aid for an electrodeless high intensity discharge lamp Starting aid for an electrodeless high intensity discharge lamp

1990-05-23

1992-01-28

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315344, 313234, H05B 4124

Patent

active

050846540

ABSTRACT:
A starting aid for an electrodeless high intensity discharge (HID) lamp comprises at least one starting electrode which, at least during lamp starting, is situated adjacent to, and preferably in contact with, the portion of the arc tube nearest the arc discharge and oriented so as to provide a capacitive starting current that flows in substantially the same location as the arc discharge, thereby easing the transition from a relatively low current glow discharge to a relatively high current, high intensity discharge. The starting aid comprises one or more conductors that substantially conform to the shape of the arc tube at least during initiation of the arc discharge. After the lamp is started, the starting aid may be moved to a predetermined location away from the arc tube. Alternatively, the starting aid may comprise one or more fixed starting electrodes. The starting aid may be coupled to the lamp ballast circuit used to drive the excitation coil either directly, or via an impedance network, or via the excitation coil. In an alternative embodiment, the starting aid is excited by a starting circuit that is separate and independent from, and operates at a substantially higher frequency than, the lamp ballast.

REFERENCES:
patent: 4810938 (1989-03-01), Johnson et al.
patent: 4812702 (1990-03-01), Anderson
patent: 4894589 (1990-02-01), Borowiec
patent: 4894590 (1990-02-01), Witting
patent: 4902937 (1990-02-01), Witting
patent: 4959582 (1990-09-01), Anderson
patent: 4982140 (1991-01-01), Witting

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