Electric lamp and discharge devices: systems – Automatic substitution of the load device or electrode – Diverse-type load device or electrode substituted
Patent
1983-02-18
1984-12-04
Dixon, Harold
Electric lamp and discharge devices: systems
Automatic substitution of the load device or electrode
Diverse-type load device or electrode substituted
307 66, 315 88, H05B 3910, H02J 700
Patent
active
044866895
ABSTRACT:
An emergency lighting unit having physical dimensions and electrical and electronic components and circuitry such that it can be directly substituted for a conventional hot cathode type fluorescent lamp in a conventional fluorescent lamp fixture which incorporates a rapid start type ballast. The emergency lighting unit comprises a direct current power supply in the form of rechargeable batteries, a light source in the form of one or more groups of low voltage high intensity miniature lamps, and electronic circuitry and components utilizing power supplied by the rapid start ballast for charging the batteries, monitoring their condition and reacting accordingly, and detecting the state of the normal alternating current power source and reacting accordingly. In a preferred embodiment, the emergency lighting unit utilizes pulses to detect the emergency or "FAIL" state of the system power. The pulses are supplied by a unique pulser unit which is designed to be directly substituted for a standard wall switch.
REFERENCES:
patent: 3573541 (1971-04-01), Dunn
patent: 4144462 (1979-03-01), Sieron et al.
patent: 4216410 (1980-08-01), Feldstein
patent: 4297614 (1981-10-01), Chandler
Davis David W.
Plumly George W.
Dixon Harold
Fails James C.
Plumly George W.
Wofford Wm. T.
Zobal Arthur F.
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