Lighting failure detector for a luminaire

Details Lighting failure detector for a luminaire Lighting failure detector for a luminaire

1993-03-09

1994-05-10

Kwon, John T.

Electric lamp and discharge devices: systems

With signal, indicator, or alarm

315159, 315360, 340641, H05B 3702

Patent

active

053111010

ABSTRACT:
A lighting failure detector for a luminaire which ascertains that a lamp is lit at night and indicates the result of detection includes a phase difference detector circuit for ascertaining the lighting of the lamp through voltage and current applied to the lamp, a timer operating in response to an output signal from the phase difference detector circuit, and an indicator operated in response to a time-up signal from the timer.

REFERENCES:
patent: 3450939 (1969-06-01), Misencik
patent: 3654514 (1972-04-01), Kappenhagen
patent: 3678499 (1972-07-01), McCarty
patent: 4198563 (1980-04-01), Elssner
patent: 4354180 (1982-10-01), Harding
patent: 4423478 (1983-12-01), Bullock et al.
patent: 4451763 (1984-05-01), Sodini
patent: 4745339 (1988-05-01), Izawa et al.
patent: 4751399 (1988-06-01), Koehring et al.
patent: 5057814 (1991-10-01), Onan et al.
patent: 5086294 (1992-02-01), Kasegi

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