Full duplexing for power line data communications

H - Electricity – 04 – B

Patent

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Details

H04B 1/38 (2006.01) H04B 3/03 (2006.01) H04B 3/56 (2006.01)

Patent

CA 2483586

There is provided a coupling circuit for a full duplex modem having a transmitter (100) and a receiver (120). The coupling circuit includes a first transformer (250) having a primary winding and a secondary winding, where the primary winding is coupled to the transmitter, a second transformer (255) having a primary winding and a secondary winding, where the primary winding of the second transformer is coupled to a communications line, and a resistance (205) between a terminal of the primary winding of the first transformer and a terminal of the primary winding of the second transformer. The secondary windings of the first and second transformers are connected in series, with opposing phase, and coupled to the receiver to minimize a level of a signal from the transmitter from reaching the receiver.

La présente invention concerne un circuit de couplage destiné à un modem de duplex intégral comprenant un émetteur et un récepteur. Le circuit de couplage comprend (a) un premier transformateur doté d'un enroulement primaire et d'un enroulement secondaire, ledit enroulement primaire étant couplé à l'émetteur, (b) un deuxième transformateur doté d'un enroulement primaire et d'un enroulement secondaire, ledit enroulement primaire du deuxième transformateur étant couplé à une ligne de communications, et (c) une résistance située entre une borne de l'enroulement primaire du premier transformateur et une borne de l'enroulement primaire du deuxième transformateur. Les enroulements secondaires des premier et deuxième transformateurs sont connectés en série, en opposition de phase, et couplés au récepteur pour réduire au maximum un niveau d'un signal envoyé par l'émetteur au récepteur.

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