Browse Prior Art Database

Coaxial Cable Lightning-Strike Protection

IP.com Disclosure Number: IPCOM000039943D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Gorga, KJ: AUTHOR [+2]

Abstract

A described circuit protects a communication coaxial cable from high voltage transients by using a transient suppressor and isolating the high capacitance of the suppressor from the coaxial cable with clamp diodes. In order to protect coaxial cable driver-receiver devices from lightning transients a transient voltage suppressor (TVS) is needed. However, the high capacitance of such a device prohibits it from being placed on the signal cable. Instead, clamp diodes are used as a method of isolating the capacitance of the TVS. Diodes D1 and D2 have a very low capacitance, allowing them to be used on the high data rate cable without significantly distorting the waveform. Diode D1 clamps any positive transient greater than +8 V to the +7.5 V power supply and D2 clamps any transient less than -.6 V to ground.

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Coaxial Cable Lightning-Strike Protection

A described circuit protects a communication coaxial cable from high voltage transients by using a transient suppressor and isolating the high capacitance of the suppressor from the coaxial cable with clamp diodes. In order to protect coaxial cable driver-receiver devices from lightning transients a transient voltage suppressor (TVS) is needed. However, the high capacitance of such a device prohibits it from being placed on the signal cable. Instead, clamp diodes are used as a method of isolating the capacitance of the TVS. Diodes D1 and D2 have a very low capacitance, allowing them to be used on the high data rate cable without significantly distorting the waveform. Diode D1 clamps any positive transient greater than +8 V to the +7.5 V power supply and D2 clamps any transient less than -.6 V to ground. TVS1 will absorb either of these transients, thereby protecting the driver-receiver devices and not distorting the signal waveform.

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