Self checking temperature sensing circuit

Details Self checking temperature sensing circuit Self checking temperature sensing circuit

1996-09-09

1998-05-05

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

219484, H02H 504

Patent

active

057484295

ABSTRACT:
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.

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patent: 3903743 (1975-09-01), Noller
patent: 4702619 (1987-10-01), Camp et al.
patent: 5043692 (1991-08-01), Sites et al.
patent: 5057674 (1991-10-01), Smith-Johannsen
patent: 5070932 (1991-12-01), Vlasak
patent: 5072879 (1991-12-01), Noye
patent: 5296996 (1994-03-01), Hansson et al.

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