Electrical heating apparatus overheat protection circuits

Details Electrical heating apparatus overheat protection circuits Electrical heating apparatus overheat protection circuits

1981-12-10

1984-02-07

Paschall, M. H.

Electric heating

Heating devices

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

219212, 219508, 219510, H05B 102

Patent

active

044305605

ABSTRACT:
An electrical heating apparatus, and particularly a bedcover preferably in the form of a blanket, protected against an overheating condition and in which electrical current flow through a heating element is controlled by a pair of gate controlled bidirectional semiconductor switches electrically connected to one another in series and in back-to-back orientation. The gates of the semiconductor switches are connected through a temperature sensitive capacitor which triggers the semiconductor switches from a conductive to a nonconductive state in response to the sensing of an overheating condition.

REFERENCES:
patent: 3462585 (1969-08-01), Somers
patent: 3683151 (1972-08-01), Mills et al.
patent: 4198562 (1980-04-01), Mills et al.

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