Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch cut-out
Patent
1983-02-22
1985-03-05
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch cut-out
315307, 315119, 315DIG7, 363 56, H05B 3702, H05B 3904, H05B 4136
Patent
active
045033633
ABSTRACT:
With many fluorescent lighting fixtures, the voltages required at the sockets to start and operate the fluorescent lamps are so high as potentially to constitute a substantial electric shock hazard to persons having to service such fixtures. To mitigate this hazard, whenever socket voltages exceed certain levels, protective measures have to be provided.
Subject invention constitutes an electronic means for removing the socket voltages from a fluorescent lighting fixture in cases where a lamp is removed from one of its sockets.
The invention relates to situations wherein inverter-type ballasting is being used, and involves the use of an electronic means for disabling the inverter whenever the ballast has provided the relatively high output voltage required for lamp starting for a period longer than that normally required for the lamps to start. However, if the lamps do start within the normally required time period, thereby causing a reduction in the output voltage, the disabling of the inverter will not occur.
REFERENCES:
patent: 4005335 (1977-01-01), Perper
patent: 4398126 (1983-08-01), Zuchtriegel
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