Floating drive technique for reverse battery protection

Details Floating drive technique for reverse battery protection Floating drive technique for reverse battery protection

1993-05-26

1996-07-23

Wysocki, Jonathan

Electricity: electrical systems and devices

Polarity reversing

Automatic

361245, 361 84, 361 82, 307 107, 307130, 307131, H02H 318

Patent

active

055396100

ABSTRACT:
A MOSFET is used to protect a battery driven load against the effects of a reverse-connected battery. This invention is particularly suitable for use with loads, such as those commonly found in motor vehicles, which contain semiconductor devices that may be severely damaged by a reverse voltage. The source of the MOSFET is connected to the positive terminal of the battery, and a gate driver circuit is used to provide a gate to source voltage sufficient to turn the MOSFET on when the battery is properly connected. If the battery is connected in reverse, the gate driver turns the MOSFET off, and the intrinsic body-drain diode in the MOSFET prevents a reverse current flow through the load. In conjunction with the MOSFET, a sensing device sends out a warning signal which may be used, for example, to turn off a portion of the load if the output of the battery falls below a level necessary to maintain the MOSFET in a fully on condition.

REFERENCES:
patent: 4680516 (1987-07-01), Guzik et al.
patent: 4808839 (1989-02-01), Dunn et al.
patent: 4835649 (1989-05-01), Salerno
patent: 4857985 (1989-08-01), Miller
patent: 4992683 (1991-02-01), Robin
patent: 5109162 (1992-04-01), Koch et al.
patent: 5156989 (1992-10-01), Williams et al.
patent: 5181091 (1993-01-01), Harrington, III et al.
patent: 5229633 (1993-07-01), Fisher et al.

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