Electric lamp and discharge devices: systems – With signal – indicator – or alarm – Plural load device systems
Patent
1991-03-19
1992-12-01
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
Plural load device systems
315131, 315256, H05B 3700
Patent
active
051681986
ABSTRACT:
A lamplight failure detection system for detecting lamplight failure in a lamplight circuit, the lamplight circuit having a plurality of lamplight units connected with the secondary side circuits of each of a plurality of current transformers, the current transformers having their primary side circuits connected in series to an alternating current power supply. The lamplight failure detecting system includes a plurality of lamplight failure detectors fitted to each lamplight unit for detecting lamplight failure in the corresponding lamplight unit, a power control unit for repeatedly performing the momentary interruption of the output of the alternating power supply when there is no fault in the lighting of the lamplight unit, a plurality of lamplight circuit control units fitted to each lamplight failure detector for electrically closing the secondary side circuit of the current transformer when a lamplight failure is detected by the lamplight failure detector and for opening the secondary side circuit for a fixed time when a predetermined number of momentary interruptions of the alternating current power supply which occur after the lamplight failure is detected, a lamplight failure judgement unit for detecting lamplight failure based on variations in the outputs of alternating current power supply, and a lamplight failure locator unit for deciding which lamplight units have failed based on the comparison between the number of momentary interruptions from the time when a first lamplight failure is detected to when the next lamplight failure is detected with the predetermined number of momentary interruptions for each of lamplight unit.
REFERENCES:
patent: 3829735 (1974-08-01), Berlock
patent: 4295079 (1981-10-01), Otsuka et al.
patent: 4396868 (1983-08-01), Watanabe et al.
patent: 4675574 (1987-06-01), Delflache
patent: 5034659 (1991-07-01), Taniguchi
Kabushiki Kaisha Toshiba
LaRoche Eugene R.
Zarabian A.
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