Control of heating cable

H - Electricity – 05 – B

Patent

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Details

H05B 3/56 (2006.01)

Patent

CA 2592074

Devices and methods for the control of heating cables are described. A first heating cable assembly includes a heating cable, a heater regulator for connection electrically in series between the heating cable and a voltage source. The heater regulator comprises a material having a positive temperature coefficient of resistance such that in use the voltage across the heating cable is dependent upon the temperature of the heater regulator. A second heating cable assembly includes a heating cable having a resistive heating element, a material having a positive temperature coefficient resistance for controlling the heat output from the heating cable, and a cold start limiter element comprising a material having a negative temperature coefficient of resistance for connection electrically in series with the heating element and a voltage source.

La présente invention décrit des dispositifs et procédés pour le contrôle des câbles chauffants. Un premier ensemble de câble chauffant comprend un câble chauffant, un régulateur de chauffe pour connexion électrique en série entre le câble chauffant et une source de tension. Le régulateur de chauffe comprend un matériau ayant un coefficient de résistance de température positive de sorte que, lors de l~utilisation, la tension passant par le câble chauffant dépende de la température du régulateur de chauffe. Un second ensemble de câble chauffant comprend un câble chauffant ayant un élément chauffant résistif, un matériau ayant un coefficient de résistance de température positive pour contrôler la sortie de chaleur depuis le câble chauffant et un élément limiteur de démarrage à froid comprenant un matériau ayant un coefficient de résistance de température négative pour connexion électrique en série avec l~élément chauffant et une source de tension.

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