Reverse battery protection circuit

Details Reverse battery protection circuit Reverse battery protection circuit

1997-10-09

1998-05-26

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

307127, H02H 318

Patent

active

057576009

ABSTRACT:
In order to protect a polarity-sensitive load from a reversed battery assembly, the drain and source electrodes of a MOSFET (or bipolar transistor) device are connected in series with the load and battery and its gate electrode is connected to or otherwise coupled to a node between a battery terminal and the load. If the battery is inserted with correct polarity, the transistor is turned on and inserts its small on-resistance into the circuit. If the battery is inserted with incorrect polarity, the transistor does not turn on, and the polarity-sensitive load is protected.

REFERENCES:
patent: 4857985 (1989-08-01), Miller
patent: 5179337 (1993-01-01), Staarman et al.
patent: 5179488 (1993-01-01), Rovener
patent: 5410441 (1995-04-01), Allman

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