Alarm circuit for detecting overheated condition

Details Alarm circuit for detecting overheated condition Alarm circuit for detecting overheated condition

1979-05-02

1981-07-14

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

128736, 73362AR, 337298, 340573, 340635, G08B 1706, G08B 2100

Patent

active

042789702

ABSTRACT:
An alarm circuit for detection of an overheated condition comprises a bridge rectifier or a battery to provide a d.c. input, and a detector bridge including a thermistor and Zener diode in adjacent arms. The diode is set to operate along that portion of the thermistor response curve which is slowly changing. Hence, the Zener diode will be activated if the thermistor detects at the very onset of an overheated condition. Bridge unbalance is fed to an operational amplifier which activates a transistor to turn on an alarm such as an audio indicator, LED, telemetry system, etc. The alarm circuit has application for detection of a line overload, as a monitoring device for patients and for persons undergoing physical activity such as joggers and the like. By sounding an early alarm, overheating in a line wire caused by say, an overheated appliance, can be corrected with a consequent energy saving and minimizing damage to the appliance.

REFERENCES:
patent: 3420104 (1969-01-01), Troemel et al.
patent: 3494196 (1970-02-01), Moussette
patent: 3671953 (1972-06-01), Goldberg
patent: 3680384 (1972-08-01), Grindheim
patent: 3748655 (1973-07-01), Engelhardt et al.
patent: 3960138 (1976-06-01), Doss et al.
patent: 4003038 (1977-01-01), Meijer

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