# US 5,349,321 A · Powercord transformer

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- Number: US 5,349,321 A
- Document ID: US5349321A
- Status: Granted
- Kind: A
- Application number: 08/004,381
- Filed: 1993-01-14
- Granted: 1994-09-20
- Earliest claimed: 1993-01-14
- Assignees: International Business Machines Corporation
- Inventors: Edwin J. Selker
- Web page: https://patentgrep.com/patent/US5349321A

## CPC

- H01F 30/06: characterised by the structure
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

An elongated ferromagnetic core is surrounded by two windings. Optional separators separate the core from the windings and one winding from the other winding. A tube-like ferromagnetic sheath covers the windings and core. The sheath and core are connected, preferably at both ends. At one end, one winding may be connected to a plug for connecting to a wall outlet for supplying an alternating current thereto. At the other end, the other winding may be connected to an external load for providing a voltage thereto. Optionally, an electrically insulating, thermally conductive, outer cover covers the ferromagnetic sheath. In a first embodiment, one winding is surrounded by the other winding. In a second embodiment, one winding surrounds a portion of the core and the other winding surrounds another portion of the core.

## Claims

### Claim 1

A powercord transformer, comprising:
an elongated core comprising ferromagnetic material;
a first winding surrounding said core;
a second winding surrounding said core, wherein said first winding and said second winding are stationary relative to one another and wherein said first winding surrounds a first portion of said core and said second winding surrounds a second portion of said core;
a sheath comprising ferromagnetic material surrounding said core, said first winding and said second winding; and
means for connecting said sheath to said core, such that a complete magnetic circuit is created.

### Claim 2

A powercord transformer, comprising:
an elongated core comprising ferromagnetic material;
a first winding surrounding said core;
a second winding Surrounding said core, wherein said first winding and said second winding are stationary relative to one another;
a sheath comprising ferromagnetic material surrounding said core, said first winding and said second winding;
means for connecting said sheath to said core, such that a complete magnetic circuit is created; and
means for separating said core from said first winding and said second winding.

### Claim 3

A flexible powercord transformer comprising:
an elongated flexible core comprising ferromagnetic material;
a first winding surrounding said elongated flexible core;
a second winding surrounding said elongated flexible core;
a flexible sheath comprising ferromagnetic material surrounding said elongated flexible core, said first winding and said second winding; and
means for connecting said sheath to said core, such that a complete magnetic circuit is created.

### Claim 4 (depends on 3)

The powercord transformer of claim 3, wherein said core comprises a plurality of ferromagnetic strands.

### Claim 5 (depends on 3)

The powercord transformer of claim 3, wherein said sheath comprises a plurality of ferromagnetic strands.

### Claim 6 (depends on 4)

The powercord transformer of claim 4, wherein said plurality of ferromagnetic strands are arranged in a biased weave.