Oscillators – With device responsive to external physical condition – Temperature or light responsive
Patent
1978-09-27
1980-01-22
Grimm, Siegfried H.
Oscillators
With device responsive to external physical condition
Temperature or light responsive
73362SC, 307310, 331107R, 331111, 340598, G01K 700, H03K 335
Patent
active
041852532
ABSTRACT:
A temperature sensitive thyristor is incorporated in a relaxation oscillator to provide active temperature sensing. As temperature decreases, the breakover voltage V.sub.BO of the thyristor increases, and when V.sub.BO becomes greater than the supply voltage, oscillations will cease, thus providing a low temperature alarm point. As temperature increases, V.sub.BO decreases and the amplitude of oscillation diminishes, thus providing a high temperature alarm point. This is a "fail-safe" arrangement because component failure also provides a warning condition (absence of oscillation). Frequency of oscillation may also be sensed as an indication of temperature.
REFERENCES:
patent: 3079484 (1963-02-01), Shockley et al.
patent: 3251004 (1966-05-01), Shombert et al.
patent: 3339085 (1967-08-01), Schmid et al.
patent: 3933046 (1976-01-01), Ebrecht
patent: 3971056 (1976-07-01), Jaskolski et al.
Jaskolski Stanley V.
Lade Robert W.
Schutten Herman P.
Spellman Gordon B.
Autio William A.
Eaton Corporation
Grimm Siegfried H.
Rather Hugh R.
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