# US 4,400,675 A · Transformer with impedance matching means

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- Number: US 4,400,675 A
- Document ID: US4400675A
- Status: Granted
- Kind: A
- Application number: 06/318,508
- Filed: 1981-11-05
- Granted: 1983-08-23
- Earliest claimed: 1981-11-05
- Assignees: Westinghouse Electric Corp.
- Inventors: Michael W. Thomas
- Web page: https://patentgrep.com/patent/US4400675A

## CPC

- H01F 19/02: Audio-frequency transformers or mutual inductances, i.e. not suitable for handling frequencies considerably beyond the audio range
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A transformer characterized by groups of low voltage and high voltage windings inductively related to a core member, and a shunt of magnetizable microlaminations disposed between the low and high voltage windings, whereby the shunts independently adjust the transformer impedance.

## Claims

### Claim 1

An electrical power transformer comprising:
a core member;
groups of sectioned low voltage windings and of high voltage windings which windings are inductively related to the core member;
a shunt of magnetic material between each group of low voltage windings and the high voltage windings; and
each shunt comprising microlaminations of magnetic materials.

### Claim 2 (depends on 1)

The transformer of claim 1 in which the shunts are insulated.

### Claim 3 (depends on 2)

The transformer of claim 2 in which the low voltage windings comprise pancake coils disposed in two spaced coil-groups, and the high voltage windings comprise pancake coils disposed between the two spaced coil-groups.

### Claim 4 (depends on 3)

The transformer of claim 3 in which the shunts are flat disc-like members disposed in spaces between the low and high voltage windings.

### Claim 5 (depends on 2)

The transformer of claim 2 in which the low voltage and high voltage windings are concentrically disposed, and the shunt is a cylindrical member between the low and high voltage windings.

### Claim 6 (depends on 5)

The transformer of claim 5 in which the high voltage winding surrounds the low voltage winding.

### Claim 7

An electrical power transformer comprising:
a core member;
groups of sectioned low voltage windings and high voltage windings, which windings are inductively related to the core member;
a shunt of magnetic material between up to two groups of low and high voltage windings; and
each shunt comprising microlaminations of magnetic materials.

### Claim 8

An electrical power transformer comprising:
a core member;
a group of low and high voltage windings inductively related to the core member;
a tertiary voltage winding associated with at least one of the low voltage and high voltage windings; and
a shunt of microlaminations of magnetic material between the tertiary voltage winding and one of the low voltage and high windings.