Method of hot restarting electrodeless HID lamps

Details Method of hot restarting electrodeless HID lamps Method of hot restarting electrodeless HID lamps

1990-12-12

1994-02-15

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315344, H05B 4116

Patent

active

052870391

ABSTRACT:
The present invention describes an apparatus and method for shutting off an electrodeless lamp such that it can be restarted instantaneously at any time. The method involves reducing the applied microwave power in a controlled way the moment the lamp is turned off. The reduction of power is accomplished by modulating the microwave power with an ever decreasing duty factor or a decrease of analog power. This reduction in power results continually in reduced light output and lamp cooling while maintaining partial ionization of the lamp fill. Circuitry to accomplish this is also presented.

REFERENCES:
patent: 4383203 (1983-05-01), Stanley
patent: 4451765 (1984-05-01), Gray
patent: 4456891 (1984-01-01), Fowks
patent: 4631449 (1986-12-01), Peters
patent: 4751434 (1988-01-01), Helling

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