Self checking temperature sensing circuit

Details Self checking temperature sensing circuit Self checking temperature sensing circuit

G - Physics

01

K

G01K 7/16 (2006.01) G01K 15/00 (2006.01)

Patent

CA 2214746

A self-checking temperature sensing circuit in which temperature sensitivity is provided by first and second resistive elements having positive and negative temperature coefficients respectively. The resistive elements are connected in parallel current paths, one of which includes a diode for allowing only unidirectional current flow. The resistances of the restrictive elements are determined by a circuit which periodically reverses the polarity of a voltage applied across the parallel paths.

Circuit thermosensible à auto-contrôle dans lequel la thermosensibilité est assurée par un premier et un deuxième élément résistif ayant respectivement des coefficients de température positif et négatif. Les éléments résistifs sont connectés en tracés de courant parallèles, l'un d'eux comprenant une diode pour laisser passer le courant seulement dans un sens. La résistance des éléments résistifs est déterminée par un circuit qui inverse périodiquement la polarité d'une tension appliquée aux tracés parallèles.

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