Oscillators – With device responsive to external physical condition – Temperature or light responsive
Patent
1978-09-27
1980-01-15
Grimm, Siegfried H.
Oscillators
With device responsive to external physical condition
Temperature or light responsive
73362SC, 307310, 331113R, 340598, G01K 700, H03K 3282
Patent
active
041841263
ABSTRACT:
A temperature sensitive thyristor is incorporated with an astable multivibrator to provide active temperature sensing. Below the switching temperature Tsw of the thyristor, an oscillatory signal is present at the output of the multivibrator. When the temperature exceeds Tsw, oscillation ceases because of the shunt path provided through the thyristor when it intrinsically switches to its low resistance on state above Tsw. Cooling results in resumption of oscillation. This is a "fail-safe" arrangement because component failure also provides a warning condition (absence of oscillation).
REFERENCES:
patent: 3308667 (1967-03-01), Pearlman
patent: 3639777 (1972-02-01), Bolinger
patent: 3971056 (1976-07-01), Jaskolski et al.
Jaskolski Stanley V.
Lade Robert W.
Schutten Herman P.
Spellman Gordon B.
Autio W. A.
Eaton Corporation
Grimm Siegfried H.
Rather H. R.
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