Communications: electrical – Selective – Having indication or alarm
Patent
1978-06-15
1980-03-25
Yusko, Donald J.
Communications: electrical
Selective
Having indication or alarm
315 82, 340641, G08B 2300, H05B 3703, B60Q 1100
Patent
active
041952812
ABSTRACT:
A lamp outage indicator circuit for sensing and indicating outage of remotely located lamps in a vehicle. The lamp outage indicator employs a semiconductor sensing device to sense the voltage excursion which occurs when a lamp burns out. The sensing semiconductor is located in a bridge circuit to negate the effects of voltage and temperature fluctuations on the operating point of the circuit. Further, the sensing semiconductor device is located in the circuit so that in the normal operating state, a reference semiconductor device is on while the sensing semiconductor device is off. Lamp outage causes the current to shift from the reference semiconductor device to the sensing semiconductor device so as to turn the reference device off, and the sensing device on to energize an appropriate indicator. In one embodiment, the sensing semiconductor device is a light emitting diode while in a second embodiment, the sensing semiconductor device is a transistor.
REFERENCES:
patent: 2071911 (1937-02-01), Young
patent: 3391302 (1968-07-01), Weingarden
patent: 3604949 (1971-09-01), Conzelmann et al.
patent: 3660813 (1972-05-01), Rumpf
patent: 3735378 (1973-05-01), McNamee
patent: 3774188 (1973-11-01), Bial et al.
patent: 3883777 (1975-05-01), Morita
A. Yanischeff-"Resistor Testor", IBM Technical Disclosure Bulletin, vol. 3, No. 5, p. 1368.
Essex Group Inc.
Freiburger Lawrence E.
Sommer Robert D.
Yusko Donald J.
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