Temperature sensing circuit

Details Temperature sensing circuit Temperature sensing circuit

1991-09-16

1996-10-08

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

323907, H02H 504

Patent

active

055637604

ABSTRACT:
A temperature sensing circuit (100) for sensing the temperature of an active semiconductor device, for example, a power MOSFET (11) of a semiconductor body (10). The circuit has a first temperature sensing device (R1R2) provided on the semiconductor body at a first position (P.sub.1) adjacent a periphery (12) of the active semiconductor device (11), a second temperature sensing device (R3,R4) provided on the semiconductor body at a second position (P.sub.2) further from the periphery of the active semiconductor device than the first position. An arrangement, for example, a comparator responsive to the first and second temperature sensing devices provides a control signal to switch off the active semiconductor device (11) when the difference in the temperature sensed by the first and second sensing devices reaches a predetermined value.

REFERENCES:
patent: 3085193 (1963-04-01), Perino
patent: 4136354 (1979-01-01), Dobkin
patent: 4268887 (1981-05-01), Ghiringelli et al.
patent: 4952865 (1990-08-01), Pataut et al.
patent: 4971921 (1990-11-01), Fukunaga et al.
patent: 4987379 (1991-01-01), Hughes
patent: 5039878 (1991-08-01), Armstrong et al.

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