Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1991-05-23
1992-07-21
Stephan, Steven L.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 86, 361 90, H02H 504
Patent
active
051328682
ABSTRACT:
A protective circuit for protecting electrical equipment. The circuit has a eat sensor for sensing heat from the electrical equipment, an amplifier for amplifying the sensor voltage. The circuit also has a power supply, a heater, and drive transistor for conducting current from the power supply to the heater due to amplified sensor voltage on the drive transistor. The circuit further has a heat sensitive switch that has a switching temperature. The heat sensitive switch is between another power supply, for the electrical equipment, and the electrical equipment. The heat sensitive switch initially conducts electrical power to the electrical equipment. The switch will interrupt electrical power to the electrical equipment, after a selected rate of heat from the electrical equipment activates the circuit to cause the heater to produce a switching heat. This switching heat from the heater raises the temperature of the heat sensitive switch above its switching temperature. Electrical power to the electrical equipment is interrupted. The switch will again conduct electrical power to the electrical equipment after the temperature of the heat sensitive switch decreases below its switching temperature, due to cooling of the electrical equipment and the heater.
REFERENCES:
patent: 4675777 (1987-06-01), Watrous
patent: 4733322 (1988-03-01), Harper et al.
patent: 4750079 (1988-06-01), Fay et al.
patent: 4866559 (1989-09-01), Cobb et al.
patent: 4887181 (1989-12-01), Lenz
patent: 5001593 (1991-03-01), Zitta et al.
Clower Penn H.
Venditti Carlo
Nguyen Matthew
Stephan Steven L.
Tarlano John P.
The United States of America as represented by the Secretary of
Wohlfarth Robert M.
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