Linear low capacitance overvoltage protection circuit using...

Details Linear low capacitance overvoltage protection circuit using... Linear low capacitance overvoltage protection circuit using...

2007-10-01

2010-12-28

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

Reexamination Certificate

active

07859814

ABSTRACT:
A low capacitance overvoltage protection circuit (80) provides protection to a communication line (12, 14). A diode bridge (46) is connected to the communication line (12, 14) so that overvoltages of both polarities pass through an overvoltage protection device (44) in one direction. A bias voltage supply48applies a bias voltage across a semiconductor overvoltage protection device (44) through isolation resistors (64, 66) to make the capacitance of the device (44) independent of changes in communication line voltages. When line voltages exceed the magnitude of the bias voltage, a blocking diode (82) prevents current from flowing through the bias voltage supply (48) in a reverse direction.

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Jon Schleisner, High Speed Data Line Protection, Applicaiotn Notes, Jul. 18, 2002, 3 pages.

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