Reduced power line driver

H - Electricity – 04 – M

Patent

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Details

H04M 1/76 (2006.01) H04B 1/38 (2006.01) H04M 1/00 (2006.01)

Patent

CA 2379519

A telephone line feed circuit for use with a telecommunication line includes a transformer having a primary winding and a secondary winding wound with low resistance conductors, the primary for direct connection to a tip terminal and a ring terminal, and a driver circuit having an output connected to a secondary winding of the transformer for driving the transformer secondary winding directly with substantially no resistance therebetween while maintaining an impedance match between the telecommunications line and the telephone line feed circuit, to thereby reduce power consumption of the driver circuit. The present invention seeks to provide a line interface circuit that allows the significant reduction of driver power, namely up to about 50 %.

L'invention concerne un circuit d'alimentation de ligne téléphonique, utile dans une ligne de télécommunications et comprenant un transformateur doté d'un premier et d'un second enroulement, enroulés au moyen de conducteurs basse résistance; le premier enroulement est directement connecté à une borne de pointe et une borne de nuque; un circuit d'attaque comprenant une sortie connectée au second enroulement du transformateur sert à exciter ce second enroulement, directement, sans pratiquement de résistance entre eux, tout en maintenant une correspondance d'impédance entre la ligne de télécommunications et le circuit d'alimentation de la ligne téléphonique, de manière à réduire la consommation d'énergie du circuit d'attaque. L'invention porte notamment sur un circuit d'interface de ligne qui permet cette réduction importante de puissance d'attaque, laquelle réduction peut aller jusqu'à 50 % environ.

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