Protection circuit for a digital subscriber line device

H - Electricity – 02 – H

Patent

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Details

H02H 7/20 (2006.01) H02H 9/06 (2006.01) H04M 11/06 (2006.01)

Patent

CA 2456368

A protection circuit for a DSL transceiver unit includes a capacitor connected in series between a first and second portion of a primary winding of a transformer. The first and second portions are coupled to first and second lines, respectively, of a twisted-pair telephone line. A first voltage controlled device is coupled to the first line and a chassis ground. The first voltage controlled device has a first threshold turn-on voltage at which the first voltage controlled device provides a first current path from the first line to chassis ground. A resistive device and a second voltage controlled device are coupled across the capacitor in series. The second voltage controlled device has a second threshold turn-on voltage at which the second voltage controlled device provides a second current path from a first capacitor terminal of the capacitor to a second capacitor terminal of the capacitor. The second threshold turn-on voltage is lower than the first threshold turn-on voltage.

Un circuit de protection pour un transmetteur de ligne d'abonné numérique (DSL) comprend un condensateur raccordé en série entre la première et la seconde parties du primaire d'un transformateur. Ces première et seconde parties sont couplées aux première et seconde lignes, respectivement, d'une ligne téléphonique à paire torsadée. Un premier dispositif commandé en tension est accouplé à la première ligne et à la masse du châssis. Le premier dispositif commandé en tension présente une première tension de déclenchement de seuil à laquelle ledit premier dispositif commandé en tension fournit un premier trajet de courant, de la première ligne à la masse du châssis. Un dispositif résistif et un second dispositif commandé en tension sont accouplés à travers le condensateur en série. Le second dispositif commandé en tension présente une seconde tension de déclenchement de seuil à laquelle ledit second dispositif commandé en tension fournit un second trajet de courant, de la première borne du condensateur à la seconde borne du condensateur. La seconde tension de déclenchement de seuil est inférieure à la première tension de déclenchement de seuil.

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