Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
Patent
1991-10-31
1992-07-28
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Induction-type discharge device load
315307, 315DIG7, H05B 4124
Patent
active
051343452
ABSTRACT:
A feedback system for a high intensity discharge lamp detects arc instabilities and stabilizes the discharge, thereby increasing the useful life of the lamp. The feedback system includes a phase detector circuit for detecting relatively low fequency, recurrent variations in the characteristic of the arc discharge, indicating the onset of an arc instability. As a result, a signal is generated to decrease the power supplied to the lamp by an amount sufficient to stabilize the discharge without a significant decrease in visible light output.
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El-Hamamsy Sayed-Amr A.
Roberts Victor D.
Breedlove Jill M.
Davis Jr. James C.
General Electric Company
LaRoche Eugene R.
Snyder Marvin
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