# US 5,705,971 A · Low leakage coaxial transformers

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- Number: US 5,705,971 A
- Document ID: US5705971A
- Status: Granted
- Kind: A
- Application number: 08/687,766
- Filed: 1996-07-26
- Granted: 1998-01-06
- Earliest claimed: 1993-05-14
- Assignees: Allen-Bradley Company, Inc.
- Inventors: Gary Skibinski
- Web page: https://patentgrep.com/patent/US5705971A

## CPC

- H01F 27/2847: {Sheets; Strips (H01F27/2866 takes precedence)}
- H01F 27/2895: {Windings disposed upon ring cores}
- H01F 2027/2833: {using coaxial cable as wire}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A transformer including a core; a concentric inner primary tube passing through the core and running up and over at least a portion of the core, the concentric inner primary tube defining a longitudinal axis within the core; and a concentric outer secondary tube passing through the core and running up and over the concentric inner primary tube, the concentric outer secondary tube defining a longitudinal axis within the core and being spaced apart from the concentric inner primary tube, the longitudinal axis of the concentric inner primary tube and the longitudinal axis of the concentric outer secondary tube being aligned with one another so as to be coaxial. The concentric outer secondary tube substantially encloses the concentric inner primary tube so as to provide a low impedance shield.

## Claims

### Claim 1

A transformer comprising:
a core;
a primary winding comprising a first inner tubular wall, a first outer tubular wall and a first connecting surface joining the first inner tubular wall and the first outer tubular wall, the first inner tubular wall running through said core;
a first primary lead connected to the first inner tubular wall;
a second primary lead connected to the first outer tubular wall;
a secondary winding comprising a second inner tubular wall, a second outer tubular wall and a second connecting surface joining the second inner tubular wall and the second outer tubular wall, the second inner tubular wall running through the core;
a first secondary lead connected to the second inner tubular wall; and
a second secondary lead connected to the second outer tubular wall;
wherein the secondary winding, the first secondary lead and the second secondary lead completely enclose the primary winding and wherein the first secondary lead and the second secondary lead substantially enclose the first primary lead and the second primary lead.