Switching device with power FET and short-circuit detection

Details Switching device with power FET and short-circuit detection Switching device with power FET and short-circuit detection

1997-05-09

1999-06-22

Paladini, Albert W.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

360 93, 340650, H02H 308

Patent

active

059145455

ABSTRACT:
A circuit arrangement protects an FET power switch against damage from short circuits that may occur in the load connected between the drain terminal and an operating voltage source of the FET. The protection is achieved by the cooperation between a shunt resistor (3) connected between ground and the source terminal (S) of the FET and a gate voltage limiter (7) connected to the gate terminal of the FET. This cooperation limits the short circuit current through the FET until a short circuit detector (DT) provides a control signal that switches the FET off.

REFERENCES:
patent: 4088943 (1978-05-01), Schmidt
patent: 4710699 (1987-12-01), Miyamoto
patent: 4937697 (1990-06-01), Edwards et al.
patent: 5654859 (1997-08-01), Shi
patent: 5684663 (1997-11-01), Mitter
Ulrich Tietze, MOS-FET-Elektrometerverstarker mit geschutztem Eingang, Elektronik 1967, Heft 10, pp. 313 to 316.

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