Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1983-02-08
1985-01-01
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219212, 219511, 219483, H05B 102
Patent
active
044917236
ABSTRACT:
A heating circuit for an electric blanket or the like comprises a heating conductor, a sensor conductor and separating means which separates the conductors and has an impedance that falls with increasing temperature and/or which will melt in the event of overheating to allow contact between the conductors. A thermal fuse and a first diode are connected in series with the heating conductor between AC supply input terminals, and a resistor is thermally coupled to the thermal fuse and electrically connected such that the resistor and the impedance of the separating means are connected in series between the input terminals. A drop in the impedance of the separating means due to overheating will cause the current through the resistor to increase, so heating the resistor to cause the thermal fuse to disconnect the circuit from the supply. The resistor is connected in series with the heating conductor and the first diode and a second diode bypasses the resistor during those half-cycles of the AC supply voltage during which the first diode conducts.
REFERENCES:
patent: 4251718 (1981-02-01), Cole
patent: 4278874 (1981-07-01), Cole
Dreamland Electrical Appliances P.L.C.
Paschall M. H.
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