High intensity discharge lamp ballast having a transient protect

Details High intensity discharge lamp ballast having a transient protect High intensity discharge lamp ballast having a transient protect

1994-07-29

1995-09-26

Pascal, Robert J.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315 91, 315127, 315362, H05B 4116

Patent

active

054536669

ABSTRACT:
A ballast for lighting a high intensity discharge lamp having a power factor correction scheme. The power factor correction scheme includes a triac. To prevent the triac from damage when the lamp is not lit and power line transients are present, the triac is turned ON. The triac is also turned ON whenever the lamp is lit.

REFERENCES:
patent: 4785390 (1988-11-01), Zelina et al.
patent: 5180950 (1993-01-01), Nilssen
patent: 5396153 (1995-03-01), Shackle

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