Heating circuits

Details Heating circuits Heating circuits

1978-12-19

1981-02-17

Reynolds, Bruce A.

Electric heating

Heating devices

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

219483, 219505, 219511, 219212, H05B 102

Patent

active

042517184

ABSTRACT:
A heating circuit, in particular for electric blankets or pads, comprises a first, heating conductor and a second conductor separated by a material which has an impedance that falls with increasing temperature and/or which will melt in the event of overheating to allow contact between the two conductors. A half-wave rectifier and a thermally-operative circuit interruption means are connected in series with the heating conductor across an AC supply. A resistor is electrically connected to the second conductor such that the resistance and the impedance of said material are connected in series across the supply. The resistor is thermally coupled to the circuit interruption means whereby, in the event of overheating of said material, the drop in the impedance of the material to a reduced or zero value will cause the current through the resistor to increase to heat the resistor, which causes the circuit interruption means to disconnect the circuit from the supply.

REFERENCES:
patent: 3375477 (1968-03-01), Kawazoe
patent: 3462585 (1969-08-01), Somess
patent: 3549865 (1970-12-01), Melling
patent: 3564203 (1971-02-01), Naoi
patent: 3699308 (1972-10-01), Hutchinson et al.
patent: 3943326 (1976-03-01), Henry
patent: 4085309 (1978-04-01), Godel

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