Improvements relating to heating blankets and the like

Details Improvements relating to heating blankets and the like Improvements relating to heating blankets and the like

H - Electricity

05

B

H05B 3/56 (2006.01) H05B 1/02 (2006.01)

Patent

CA 2312753

The invention provides that a two conductor electric blanket has a meltdown layer between the conductors, and this meltdown layer is of a Negative Temperature Characteristic (NTC) as regards its resistance. A control circuit is coupled to the conductors and when there is overheating, the NTC layer allows a leakage current to flow between the conductors, before the meltdown layer actually melts, to stop the supply of power to the conductors, whereby melting of the meltdown layer (which destroys the future utility of the blanket) is avoided, and the blanket can be reused.

Cette invention concerne une couverture électrique à double élément conducteur séparé par une couche fusible, ladite couche présentant un coefficient de température négatif par rapport à sa résistance. Un circuit de commande est relié aux éléments conducteurs. En cas de surchauffe, la couche à coefficient de température négatif laisse passer un courant de fuite entre les éléments conducteurs avant que la couche fusible ne commence effectivement à fondre, ce qui coupe l'alimentation des conducteurs. On évite ainsi la fusion de la couche fusible, ce qui permet de réutiliser ultérieurement la couverture qui, sinon, serait inutilisable.

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