Broadband power line network device and ethernet signal coupling device thereof

Abstract

An Ethernet signal coupling device comprises: a primary side comprising TX+, TX−, RX+ and RX− signal terminals; a secondary side comprising TD+, TD−, RD+ and RD− signal terminals; a first transformer comprising a primary coil coupled to the TX+ signal terminal and the TX− signal terminal and a secondary coil coupled to the TD+ signal terminal and the TD− signal terminal; and a second transformer comprising a primary coil coupled to the RX+ signal terminal and the RX− signal terminal and a secondary coil coupled to the RD+ signal terminal and the RD− signal terminal. The primary coils of the first and second transformers are wound by triple insulated wires, or the secondary coils of the first and second transformers are wound by triple insulated wires.

What is claimed is: 
     
         1 . An Ethernet signal coupling device, comprising:
 a primary side comprising a plurality of signal terminals, which at least include a TX+ signal terminal, a TX− signal terminal, a RX+ signal terminal and a RX− signal terminal;   a secondary side comprising a plurality of signal terminals, which at least include a TD+ signal terminal, a TD− signal terminal, a RD+ signal terminal and a RD− signal terminal;   a first transformer comprising a primary coil coupled to the TX+ signal terminal and the TX− signal terminal and a secondary coil coupled to the TD+ signal terminal and the TD− signal terminal; and   a second transformer comprising a primary coil coupled to the RX+ signal terminal and the RX− signal terminal and a secondary coil coupled to the RD+ signal terminal and the RD− signal terminal,   wherein the primary coil of the first transformer and the primary coil of the second transformer are wound by triple insulated wires, or the secondary coil of the first transformer and the secondary coil of the second transformer are wound by triple insulated wires.   
     
     
         2 . The Ethernet signal coupling device as claimed in  claim 1 , wherein the primary coil of the first transformer has a central tap connected to a CT1 terminal, the secondary coil of the first transformer has a central tap connected to a CT2 terminal, the primary coil of the second transformer has a central tap connected to a CT3 terminal, and the secondary coil of the second transformer has a central tap connected to a CT4 terminal. 
     
     
         3 . The Ethernet signal coupling device as claimed in  claim 1 , further comprising:
 a first common mode choke comprising a first coil and a second coil, wherein a first electrode terminal of the first coil of the first common mode choke is connected to the TX+ signal terminal, and a first electrode terminal of the second coil of the first common mode choke is connected to the TX− signal terminal;   a second common mode choke comprising a first coil and a second coil, wherein a second electrode terminal of the first coil of the second common mode choke is connected to the TD+ signal terminal, and a second electrode terminal of the second coil of the second common mode choke is connected to the TD− signal terminal,   wherein the first electrode terminal of the primary coil of the first transformer is connected to the second electrode terminal of the first coil of the first common mode choke, the second electrode terminal of the primary coil of the first transformer is connected to the second electrode terminal of the second coil of the first common mode choke, the first electrode terminal of the secondary coil of the first transformer is connected to the first electrode terminal of the first coil of the second common mode choke, and the second electrode terminal of the secondary coil of the first transformer is connected to the first electrode terminal of the second coil of the second common mode choke.   
     
     
         4 . The Ethernet signal coupling device as claimed in  claim 3 , wherein the first coil and the second coil of the first common mode choke are wound by the triple insulated wires, or the first coil and the second coil of the second common mode choke are wound by the triple insulated wires. 
     
     
         5 . The Ethernet signal coupling device as claimed in  claim 1 , further comprising:
 a third common mode choke comprising a first coil and a second coil, wherein a first electrode terminal of the first coil of the third common mode choke is connected to the RX+ signal terminal, and a first electrode terminal of the second coil of the third common mode choke is connected to the RX− signal terminal;   a fourth common mode choke comprising a first coil and a second coil, wherein a second electrode terminal of the first coil of the fourth common mode choke is connected to the RD+ signal terminal, and a second electrode terminal of the second coil of the fourth common mode choke is connected to the RD− signal terminal;   wherein the first electrode terminal of the primary coil of the second transformer is connected to the second electrode terminal of the first coil of the third common mode choke, the second electrode terminal of the primary coil of the second transformer is connected to the second electrode terminal of the second coil of the third common mode choke, the first electrode terminal of the secondary coil of the second transformer is connected to the first electrode terminal of the first coil of the fourth common mode choke, and the second electrode terminal of the secondary coil of the second transformer is connected to the first electrode terminal of the second coil of the fourth common mode choke.   
     
     
         6 . The Ethernet signal coupling device as claimed in  claim 5 , wherein the first coil and the second coil of the third common mode choke are wound by the triple insulated wires, or the first coil and the second coil of the fourth common mode choke are wound by the triple insulated wires. 
     
     
         7 . The Ethernet signal coupling device as claimed in  claim 1 , wherein the plurality of signal terminals at the primary side and the plurality of signal terminals at the secondary side are separated from each other by at least a first distance. 
     
     
         8 . The Ethernet signal coupling device as claimed in  claim 7 , wherein the first distance is a safety distance, and the safety distance is equal to or greater than 5 mm.