Electrical heating apparatus protected against an...

Details Electrical heating apparatus protected against an... Electrical heating apparatus protected against an...

H - Electricity

02

H

309/14

H02H 5/04 (2006.01) H02H 3/34 (2006.01) H05B 1/02 (2006.01) H05B 3/34 (2006.01) H05B 3/56 (2006.01)

Patent

CA 1225426

Abstract An electrical heating apparatus such as an electric blanket includes a resistance heating wire embedded in the blanket together with a single heat sensitive conductor also embedded in the blanket and disposed in a thermally responsive relation to the heating wire. The heat sensitive conductor has a positive temper- ature coefficient electrical impedance which is continuous along its entire length. As an overheating condition arises in the blanket this is sensed by the heat sensitive conductor which is being monitored by a controller to reduce or cut off current to the resistance heating wire as necessary. The invention makes it a practical proposition to monitor all heated portions of the blanket with the elimination of all discrete temperature sensing elements.

464720

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