Polarity protection implemented with a MOSFET

Details Polarity protection implemented with a MOSFET Polarity protection implemented with a MOSFET

2006-10-24

2006-10-24

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

C307S127000, C361S082000

Reexamination Certificate

active

07126801

ABSTRACT:
A polarity protection circuit contains a metal oxide semiconductor field effect transistor (FET) that pets its control voltage via an electrical connection from supply voltage lines and a transistor that pets its control voltage via another connection from the supply voltage lines. When a supply voltage has a wrong polarity the FET is in a non-conducting state. If in the supply voltage lines during normal operation there occurs a short circuit that tends to chance a direction of the current, the transistor rapidly discharges a gate charge of the FET, and the current flow in the wrong direction is prevented.

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