MOSFET with temperature protection

Details MOSFET with temperature protection MOSFET with temperature protection

1994-02-07

1995-10-10

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Compensation for variations in external physical values

327438, 327513, 327512, H03K 1714

Patent

active

054574196

ABSTRACT:
A MOSFET protection circuit includes a switch element which is thermally coupled to the MOSFET and switches the MOSFET off by establishing a connection between the gate and source electrodes thereof when a critical temperature is reached. The switch element also generates a temperature-dependent signal which controls a voltage reducing element connected between the gate and source electrodes of the MOSFET. The voltage reducing element is activated at a temperature which is lower than the critical temperature so that the gate-source voltage of the MOSFET and the current flowing therethrough is reduced as a result at the second temperature. The temperature rise is thereby slowed.

REFERENCES:
patent: 3780322 (1973-12-01), Walters
patent: 4117505 (1978-09-01), Nakata
patent: 4207481 (1980-06-01), Dobkin
patent: 4698655 (1987-10-01), Schultz
patent: 4896199 (1990-01-01), Tsuzuki et al.
patent: 4937646 (1990-06-01), Tihanyi et al.
patent: 5025298 (1991-06-01), Fay et al.
patent: 5187632 (1993-02-01), Blessing
patent: 5221888 (1993-06-01), Moody
patent: 5272392 (1993-12-01), Wong et al.
patent: 5285346 (1994-02-01), Davies et al.

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