# US 10,504,647 B2 · Magnetic transformer having increased bandwidth for high speed data communications

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- Number: US 10,504,647 B2
- Document ID: US10504647B2
- Status: Granted
- Kind: B2
- Application number: 15/725,047
- Filed: 2017-10-04
- Published: 2018-10-04
- Granted: 2019-12-10
- Earliest claimed: 2017-04-03
- Assignees: Bel Fuse (Macao Commercial Off
- Applicants: Bel Fuse (Macao Commercial Offshore) Limited
- Inventors: Victor H. Renteria; Chun Wing (Alan) Ng; Wai Shun Leung
- Web page: https://patentgrep.com/patent/US10504647B2

## CPC

- H01F 38/14: Inductive couplings
- H01F 19/06: Broad-band transformers, e.g. suitable for handling frequencies well down into the audio range
- H01F 27/24: Magnetic cores
- H01F 27/2823: {Wires (H01F27/2866 takes precedence)}
- H01F 27/29: Terminals; Tapping arrangements {for signal inductances}
- H01F 41/07: Twisting
- H01F 41/08: Winding conductors onto closed formers or cores, e.g. threading conductors through toroidal cores
- H01F 38/50: {Transformers for galvanic isolation}
- H01F 2017/067: {Core with two or more holes to lead through conductor}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

An isolation transformer includes a transformer core. First and second through-bores extend through the transformer core from a first surface to a second surface. Each through-bore has an elongated profile with at least a portion of the elongated profile providing a respective flat winding surface. The flat winding surfaces are spaced apart by a central portion of the transformer core. The transformer is wound with a six-wire cable having a central non-conductive core. First, second, third, fourth, fifth and sixth conductive wires are positioned around and adjacent to the central non-conductive core in a substantially equally spaced angular relationship. The second conductive wire is positioned between the first conductive wire and the third conductive wire; and the fifth conductive wire is positioned between the fourth conductive wire and the sixth conductive wire. The conductive wires are twisted about the central non-conductive core at a selected twist density.

## Claims

### Claim 1

An isolation transformer comprising:
a transformer core having a first surface and a second surface;
a first through-bore extending through the transformer core from the first surface to the second surface, the first through-bore having an elongated profile with at least a portion of the elongated profile providing a first flat winding surface;
a second through-bore extending through the transformer core from the first surface to the second surface, the second through-bore having an elongated profile with at least a portion of the elongated profile providing a second flat winding surface, the second flat winding surface spaced apart from the first flat winding surface by a central portion of the transformer core;
a first three-wire cable comprising a first conductive wire, a second conductive wire, and a third conductive wire, the second conductive wire positioned between the first conductive wire and the third conductive wire, the first, second and third conductive wires twisted together, the first three-wire cable threaded through the first through-bore and around the central portion of the transformer core; and
a second three-wire cable comprising a fourth conductive wire, a fifth conductive wire, and a sixth conductive wire, the fifth conductive wire positioned between the fourth conductive wire and the sixth conductive wire, the fourth, fifth and sixth conductive wires twisted together, the second three-wire cable threaded through the first through-bore and the second through-bore and around the central portion of the transformer core, the second three-wire cable interleaved with the first three-wire cable such that one turn of the first three-wire cable is positioned between adjacent turns of the second three-wire cable, wherein
the first and third conductive wires of the first three-wire cable are connected in parallel to form a first primary winding of the isolation transformer, and the fourth and sixth conductive wires of the second three-wire cable are connected in parallel to form a second primary winding of the isolation transformer, the first and second primary windings connected in series to form a center-tapped primary winding; and
the second conductive wire of the first three-wire cable forms a first secondary winding of the isolation transformer, and the fifth conductive wire of the second three-wire cable forms a second secondary winding of the isolation transformer, the first and second secondary windings connected in series to form a center-tapped secondary winding.

### Claim 2 (depends on 1)

The isolation transformer as defined in claim 1, wherein each of the first and second through-bores has an oval-shaped profile having a central rectangular portion, a first semicircular end portion and a second semicircular end portion, each of the first and second flat winding portions defined by a respective side of the central rectangular portion of the respective through-bore.