Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1993-04-06
1995-04-04
Evans, Geoffrey S.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219212, 219505, H05B 334, H05B 356, H02H 504, H02H 700
Patent
active
054039924
ABSTRACT:
An electric blanket includes a heating element comprising inner and outer coaxial coil conductors separated by an electrically insulating layer and connected by a diode. A control assembly is connected to the heating element by a simple two-core flexible electrical cable and incorporates a thyristor and a thyristor control circuit to vary the supply of current to the heating element. Protective diodes are connected in parallel with the main heating conductor and also in parallel with the thyristor. Should the heating element overheat the insulating layer breaks down causing a short circuit between the conductors and the surge of current allowed by the protective diodes causes a fuse to blow. The conductor is always in series with the protective diodes so that in the event of transient breakdown of one of the diodes the resistance of the conductor prevents fuse operation.
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Evans Geoffrey S.
Imetec S.p.A.
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