Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-05-03
2005-05-03
Hofsass, Jeffery (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S522000, C340S653000, C324S765010, C324S762010, C324S762010, C324S762010, C324S762010, C361S093100, C361S093800, C361S100000, C361S103000, C361S106000
Reexamination Certificate
active
06888469
ABSTRACT:
An apparatus is disclosed that provides an estimate of the semiconductor junction temperature of a semiconductor device as a function of the electrical current flowing across the corresponding semiconductor junction. The apparatus includes a current sensor that samples and measures the current flowing across the semiconductor junction and provides an output signal indicative of the measured value to a current-to-temperature converter. The current-to-temperature converter estimates the temperature of the semiconductor junction using equations that include constants empirically derived for the particular device configuration including cooling and mounting methods used with it. The current-to-temperature converter provides an output temperature signal that is compared to a predetermined temperature threshold value, and in the event that the output temperature signal exceeds the predetermined temperature threshold value, an alarm signal is set.
REFERENCES:
patent: 3564293 (1971-02-01), Mungenast
patent: 3622849 (1971-11-01), Kelley et al.
patent: 4001649 (1977-01-01), Young
patent: 4052744 (1977-10-01), Boothman et al.
patent: 5249141 (1993-09-01), Vandebroek et al.
Copley Controls Corporation
Hofsass Jeffery
Pham Lam
Weingarten Schurgin, Gagnebin & Lebovici LLP
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