Electrically heated bedcover with overheat protective circuit

Details Electrically heated bedcover with overheat protective circuit Electrically heated bedcover with overheat protective circuit

1978-08-22

1980-04-15

Albritton, C. L.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219494, 219501, 323 24, 363 68, 307252B, 219212, H05B 102

Patent

active

041985621

ABSTRACT:
An electrical heating apparatus such as an electrically heated bedcover protected against an overheating condition by an overheat protective circuit which utilizes a pair of solid state switching devices in the heating element circuit. The solid state switching devices are so connected that should one switching device fail in a shorted or closed mode, a second switching device will be in the circuit to control the heating element and provide normal protection against an overheating condition. The solid state switching devices are employed in a manner which permits the use of relatively small light weight temperature sensors in the form of positive temperature coefficient devices such as PTC resistors, which avoids the need for using relatively bulky bimetallic thermostatic switches as are conventionally employed for sensing overheating conditions.

REFERENCES:
patent: 3356825 (1967-12-01), Mills et al.
patent: 3437792 (1969-04-01), Lauck
patent: 3683151 (1972-08-01), Mills et al.
patent: 3699363 (1972-10-01), Roberts
patent: 3982098 (1976-09-01), Trostler
patent: 4006367 (1977-02-01), Ott
IBM Technical Disclosure Bulletin "Motor Start Switch", vol. 14, No. 6, 11-1971.

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