Inverted Excitation coil for HID lamps

Details Inverted Excitation coil for HID lamps Inverted Excitation coil for HID lamps

1988-09-06

1990-01-16

Mis, David

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

313153, H05B 4124

Patent

active

048945919

ABSTRACT:
A novel excitation coil for both starting and maintaining a plasma arc discharge within the envelope of an arc tube in an electrodeless HID lamp, has first and second solenoidally - wound coil portions, each having an axis substantially in alignment with the axis of the other portion. The coil conductor of each portion may be disposed upon the surface of an imaginary cone having its vertex situated within the arc tube, or beyond the arc tube and within the volume of the other coil portion. The ends of each of the solenoid portions furthest from one another are connected together, and the remaining closely-positioned coil ends provide a sufficiently high starting potential, responsive to receiving an excitation signal, for providing a magnetic field; at any instant the magnetic field of each of the two portions combines in-phase in the volume, between the closer ends of both portions, into which the arc tube is normally inserted.

REFERENCES:
patent: 4812702 (1989-03-01), Anderson

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