Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1989-08-31
1991-11-05
Stephan, Steven L.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323316, 323317, 323907, G05F 322, G05F 1569
Patent
active
050633422
ABSTRACT:
An integrated temperature threshold sensing circuit comprises first and second bipolar transistors (Q1, Q2) biased so that the current density in the first transistor is larger than that in the second transistor by a first known factor. The first and second transistors have their collectors and bases connected to a first bias voltage source and to a second bias voltage source, respectively, and their emitters connected respectively to first and second current sources (12,14) for passing first and second bias currents (I.sub.1, I.sub.2) of known relative proportions (K:1) through the respective first and second transistors. A voltage comparator (26) is arranged to compare a first predetermined fraction (R(R+r)) of the base-emitter voltage of the first transistor (Q1) with a second, larger predetermined fraction (1) of the base-emitter voltage of the second transistor (Q2) so that an output (28) of the comparator assumes a first state when the temperature of the two devices is above a known threshold temperature and assumes a second state when the temperature of the two devices is below the known threshold temperature. The circuit is accurate and is compatible with MOS technology.
REFERENCES:
patent: 4287439 (1981-09-01), Leuschner
patent: 4751404 (1982-06-01), Yuen
patent: 4935690 (1990-06-01), Yan
Hughes John B.
Moulding Kenneth W.
Berhane Adolf
Franzblau Bernard
Stephan Steven L.
U.S. Philips Corporation
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