Temperature sensitive control circuit

Details Temperature sensitive control circuit Temperature sensitive control circuit

G - Physics

01

K

340/159, 328/196

G01K 7/02 (2006.01) G01K 3/00 (2006.01) G05D 23/20 (2006.01) H03F 1/52 (2006.01) H03F 3/30 (2006.01)

Patent

CA 1042531

Abstract A temperature sensitive switching circuit includes a current source supplying two groups of serially connected diodes. The number of such diodes in the first group is smaller than that in the second so that the first group draws substantially all of the source current and the second only an infinitesimal portion of this current. As temperature increases, the voltage across both groups of diodes decrease, but the ability of the second group to carry a substantial amount of current increases at a more rapid rate than this decreased voltage would tend to reduce such current, and increases non-linearly with temperature above a given threshold temperature. This non-linear increase in current flow may be used to sense temperature change and also to control the power responsible, either directly or indirectly, for this temperature change.

192264

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