Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch cut-out
Patent
1989-06-26
1990-08-14
Yusko, Donald J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch cut-out
315119, 315DIG7, H05B 3700
Patent
active
049490184
ABSTRACT:
A starter controller for a multiple parallel ballast for high pressure sodium lamps detects lamp "drop-out" or 'cycling" and enables restarting of the lamp if the drop-out was causded by line transients of a level sufficent to cause normally operating lamps to drop-out. If the detected lamp drop-out was caused by normal end-of-life conditions, the controller does not allow restarting of the lamp. In one embodiment, the starter controller constantly monitors the voltage across the lamp terminals. When lamp drop-out occurs, this voltage rises rapidly to the ballast open-circuit secondary voltage. This voltage is detected by a level detector and rate detector which then processes lamp voltage level and rate of change of voltage after the initial drop-out is sensed. If the drop-out was caused by a sudden line transient, a relatively low maximum voltage level occurs after a high rate of change of lamp voltage, and this sensed combination of voltage level and rate of change triggers a timing circuit to enable the starter to restart the lamp. If a relatively high voltage level is sensed in combination with a high rate of change of lamp voltage, this indicates that drop-out was caused by lamp aging and the lamp is not restarted.
REFERENCES:
patent: 4242614 (1988-12-01), Vatis
patent: 4665346 (1987-05-01), Tarroux
Horabik Michael
Unicorn Electric Products
Yusko Donald J.
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