Low loss reverse battery protection

Details Low loss reverse battery protection Low loss reverse battery protection

1998-02-26

2000-03-28

Jackson, Stephen

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 82, 361 58, 361115, H02H 300

Patent

active

060439653

ABSTRACT:
A circuit having reverse battery protection includes a combination of an electrical load and an N-channel MOSFET inversely coupled in series with the load. The gate of the MOSFET is coupled to the high potential side of the electrical load. The series combination is powered by a DC voltage source. Positive polarity voltages enhance the MOSFET and provide for low loss conduction thus completing the series circuit whereas negative polarity voltages bias the MOSFET off thus providing a DC block by way of the intrinsic diode of the inversely coupled MOSFET. Gate to source voltage may be limited or controlled to prevent damage due to punch through effects at high positive voltages and to ensure turn-off of the MOSFET at negative polarity voltages.

REFERENCES:
patent: 5519557 (1996-05-01), Kopera, Jr. et al.

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