Local area network filtering circuit

Patent metadata

Field	Value
Publication number	US-2016352301-A1
Application number	US-201514918822-A
Country	US
Kind code	A1
Filing date	Oct 21, 2015
Priority date	May 29, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A LAN filtering circuit is discloses. The LAN filtering circuit includes an isolation transformer and a common-mode chock. The isolation transformer includes a first winding and a second winding coupling to each other. The first winding has a first tap, a second tap, and a center tap. A distance between the first tap and the second tap is not only larger than a distance between the first tap and the center tap but also larger than a distance between the second tap and the center tap. The common-mode chock includes a first input port, a second input port, and an input port arranged in a sequence order, the first tap is electrically connected to the first input port, the second tap is electrically connected to the second input port, and the center tap is electrically connected to the input port.

First claim

What is claimed is:

1 . A local area network filtering circuit sandwiched between a physical side and a cable side of a local area network comprising:
an isolation transformer comprising a first winding and a second winding, the first winding having a first tap, a second tap, and a center tap, wherein a distance between the first tap and the second tap is not only larger than a distance between the first tap and the center tap but also larger than a distance between the first tap and the second tap; and a common-mode chock comprising two opposite ends, one end of the common-mode chock having a first input port, a second input port, and an input port arranged in a sequential order, wherein the first tap is electrically connected to the first input port, the second tap is electrically connected to the second input port, and the center tap is electrically connected to the input port.

2 . The local area network filter circuit in claim 1 , wherein the other end of the common-mode chock comprising a first output port, a second output port, and an output port arranged in a sequential order, the first output port is electrically connected to the first input port, the second output port is electrically connected to the second input port, and the output port is electrically connected to the input port.

3 . The local area network filtering circuit in claim 2 , wherein the common-mode chock further comprising an I-shaped magnetic core, the first input port, the second input port, and the input port are arranged on a front end along a major axis of the I-shaped magnetic core in a sequential order.

4 . The local area network filtering circuit in claim 3 , wherein the first output port, the second output port, and the output port are arranged on a rear end along the major axis of the I-shaped magnetic core in a sequential order.

5 . The local area network filtering circuit in claim 2 , wherein the common-mode chock further comprises a first coil, a second coil, and a third coil, two opposite terminals of the first coil are electrically connected to the first input port and the first output port, two opposite terminals of the second coil are electrically connected to the second input port and the second output port, and two opposite terminals of the third coil are electrically connected to the input port and the output port.

6 . A local area network filtering circuit sandwiched between a physical side and a cable side of a local area network comprising:
an isolating transformer comprising a first winding and a second winding coupling to each other, the first winding having a first tap, a second tap, and a center tap, wherein a distance between the first tap and the second tap is not only larger than a distance between the first tap and the center tap but also larger than a distance between the second tap and the center tap; and a common-mode choke comprising two opposite ends, one end of the common-mode chock having a first input port, a second input port, and an input port arranged in a sequential order, wherein at least one of distances between the first input port and the input port and the second input port and the input port is larger than a distance between the first input port and the second input port, wherein the first tap is electrically connected to the first input port, the second tap is electrically connected to the second input port, and the center tap is electrically connected to the input port.

7 . The local area network filtering circuit in claim 6 , wherein the other end of the common-mode chock has a first output port, a second output port, and an output port arranged in a sequential order, the first output port is electrically connected to the first input port, the second output port is electrically connected to the second input port, and the output port is electrically connected to the input port.

8 . The local area network filtering circuit in claim 7 , wherein the common-mode choke further comprising an I-shaped magnetic core, the first input port, the second input port, and the input port are arranged on a front end along a major axis of the I-shaped magnetic core in a sequential order.

9 . The local area network filtering circuit in claim 8 , wherein the first output port, the second output port, and the output port are arranged on a rear end along the major axis of the common-mode chock in a sequential order.

10 . The local area network filtering circuit in claim 7 , wherein the common-mode chock comprising a first coil, a second coil, and a third coil, two opposite terminals of the first coil are electrically connected to the first input port and the first output port, two opposite terminals of the second coil are electrically connected to the second input port and the second output port, and two opposite terminals of the third coil are electrically connected to the input port and the output port.

Assignees

• Delta Electronics Inc

Inventors

• Teng Chi-Huan

Classifications

• H01F27/29 Primary

  Terminals; Tapping arrangements {for signal inductances} · CPC title

• H01F38/14

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H01F27/24

  Magnetic cores · CPC title

• H01F2038/143

  for signals · CPC title

• H03H1/0007 Primary

  of radio frequency interference filters · CPC title