Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1994-08-31
1996-05-28
Wong, Peter S.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323316, 323907, G05F 1575
Patent
active
055214894
ABSTRACT:
An overheat detecting circuit for detecting overheating of an integrated circuit has a band gap voltage source circuit for emitting a substantially constant voltage, which is connected between a positive power source line and a reference power source line. The voltage output from the band gap voltage source circuit is independent of the power source voltages and the ambient temperature. A constant current source circuit is provided for generating a constant current according to the output of the band gap voltage source circuit. At least one circuit element is connected between an output terminal of the constant current source circuit and the reference power source line. The circuit element has a predetermined temperature coefficient. A comparator compares the output voltage of the band gap voltage source circuit with that of the circuit element. Thus, the variation in the detected temperature according to the power source voltage, which is caused by the fluctuation of the element characteristics as the semiconductor integrated circuit is manufactured, is suppressed.
REFERENCES:
patent: 4238738 (1980-12-01), Komori
patent: 4636710 (1987-01-01), Stanojevic
patent: 4868485 (1989-09-01), Ashizaki
patent: 5061862 (1991-10-01), Tamagawa
patent: 5063342 (1991-11-01), Hughes et al.
NEC Corporation
Riley Shawn
Wong Peter S.
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