Network filtering circuit for protection lightning surge
AssigneeFoxconn Interconnect Technology Limited
InventorYong-Chun Xu
Life of this patent
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Abstract
The network filtering circuit includes a cable side for connection with a network cable, a physical side for connection with a mother board, and a plurality of transmission channels connected between the cable side and the physical side. Each of the transmission channels includes an isolation transformer with a primary coil connected with the cable side and a secondary coil coupling with the primary coil. A common mode choke has two first ends connected to the physical side and two opposite second ends. A pair of capacitors series connection with the corresponding second ends and are connected between the secondary coil and the common mode choke. The primary coil has a first center tap directly connected to a ground node.
Claims2
A network filtering circuit, comprising:
- a cable side for connection to a network cable;
- a physical side for connection to a mother board;
- and
- a plurality of transmission channels connected between the cable side and the physical side, each transmission channel comprising:
- an isolation transformer with a primary coil connected to the cable side and a secondary coil with two outer connecting ends;
- a pair of capacitors connected in series with the corresponding two outer connecting ends;
- and
- a common mode choke having two first ends connected to the physical side and two opposite second ends connected with the pair of capacitors, respectively;
- wherein the primary coil has a first center tap directly connected to a first ground node, the secondary coil has a second center tap directly connected to a second ground node, and the common mode choke is a three-wire common mode choke.
Dependencies are inferred from the claim text.