Switching device having a polarity reversal protection system

Details Switching device having a polarity reversal protection system Switching device having a polarity reversal protection system

1995-09-18

1997-07-15

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327436, 307125, 361 18, 361 58, H02H 900, H03K 1708

Patent

active

056487398

ABSTRACT:
A switching device has at least a first connection and a second connection, as well as a control connection. The switching device includes at least a first transistor and a second transistor. A load is connected to the second connection of the switching device, and a control unit is connected to the control connection of the switching device. A power supply is normally connected to the first connection, and the second connection is normally connected to ground via the load. The switching device further includes a polarity reversal protection system for protecting the switching device and the load from damage in case of a polarity reversal, which occurs when the power supply is connected to the second connection through the load, and the first connection is connected to ground. The second transistor is connected in series between the first connection of the switching device and the first transistor. The second transistor is operated inversely with respect to the first transistor.

REFERENCES:
patent: 4178619 (1979-12-01), Seiler et al.
patent: 5027250 (1991-06-01), Cini et al.
patent: 5126911 (1992-06-01), Contiero et al.
patent: 5333093 (1994-07-01), Krautschneider et al.
patent: 5410441 (1995-04-01), Allman

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