Overheat detecting circuit

Details Overheat detecting circuit Overheat detecting circuit

2006-04-28

2008-08-26

Richards, N. Drew (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

C374S163000, C374S170000, C374S178000

Reexamination Certificate

active

07417487

ABSTRACT:
An overheat detecting circuit according to an embodiment of the invention includes: a current source for generating a constant current; an overheat detecting element unit that operates with a first current generated in accordance with the constant current and generates a first voltage based on a semiconductor substrate temperature; and a detecting circuit unit that operates a second current generated in accordance with the constant current, and generates a second voltage corresponding to a predetermined semiconductor substrate temperature to detect overheating based on a voltage difference between the first voltage and a reference voltage and a voltage difference between the second voltage and the reference voltage.

REFERENCES:
patent: 5095227 (1992-03-01), Jeong
patent: 5444219 (1995-08-01), Kelly
patent: 7350974 (2008-04-01), Mikuni et al.
patent: 2005/0041353 (2005-02-01), Finney
patent: 2006/0056486 (2006-03-01), Mikuni et al.
patent: 2006/0232313 (2006-10-01), Favard
patent: 6-169222 (1994-06-01), None

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