Low capacitance surge protector for high speed data...

H - Electricity – 02 – H

Patent

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H02H 3/22 (2006.01) H02H 9/06 (2006.01) H04M 3/18 (2006.01)

Patent

CA 2339062

A surge protector circuit and method of protecting electronic equipment which do not load down a circuit at high frequencies and do not degrade a signal in high speed data transmission. A gas tube (2) is connected in parallel with low capacitance diodes (52, 54, 58, 60, 62, 66) and an avalanche semiconductor device (56, 64), such as a TVS. The diodes and the avalanche semiconductor clamp the voltage transient and allow the slower gas tube more time to fire, discharging the surge. The addition of the low capacitance diodes in series with the avalanche semiconductor, reduces the line-to-line and line-to-ground capacitances of the surge protector and keeps the surge protector circuit from loading down the rest of the circuit and degrading the signal.

L'invention porte: sur un circuit de protection contre les surtensions et un procédé de protection des d'équipements électroniques ne délestant pas un circuit aux hautes fréquences et ne dégradant pas un signal lors de la transmission de signaux à grande vitesse, et sur un tube à gaz monté en parallèle avec des diodes à faible capacité (52, 54, 58, 60, 62, 66) et un semi-conducteur à avalanche (56, 64) tel qu'un TVS. Les diodes et le semi-conducteur bloquent le transitoire de tension, ce qui donne au tube à gaz, plus lent, plus de temps pour claquer et décharger la surtension. L'adjonction de diodes à faible capacité montées en série avec le semi-conducteur réduit les capacités entre lignes et avec la terre de la protection, et empêche la protection de délester le reste du circuit et de dégrader le signal.

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