Circuitry for detecting a short circuit of a load in series with

Details Circuitry for detecting a short circuit of a load in series with Circuitry for detecting a short circuit of a load in series with

1991-02-19

1992-02-04

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 49, 361 56, 361 91, 363 50, H02H 320

Patent

active

050863649

ABSTRACT:
The voltage (U.sub.DS) on a power MOSFET (1) is compared with a voltage (U.sub.V) derived from the sum of the voltages of a Zener diode (3) and the threshold voltage (U.sub.T) of a second MOSFET (5) to detect a short circuit in a load (2) in series with the power MOSFET (1). When this total voltage is exceeded, the second MOSFET conducts. Its load current is then evaluated as the short circuit signal.

REFERENCES:
patent: 4595966 (1986-06-01), Huber et al.
patent: 4750079 (1988-06-01), Fay et al.
patent: 4893211 (1990-01-01), Bynum et al.

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