# US 2018/0323006 A1 · Transformer

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- Number: US 2018/0323006 A1
- Document ID: US20180323006A1
- Status: Published application
- Kind: A1
- Application number: 15/876,272
- Filed: 2018-01-22
- Published: 2018-11-08
- Earliest claimed: 2017-05-08
- Assignees: Delta Electronics, Inc.
- Applicants: Delta Electronics,Inc.
- Inventors: Jianxing DONG; Jianping YING; Teng LIU
- Web page: https://patentgrep.com/patent/US20180323006A1

## CPC

- H01F 27/325: {Coil bobbins (formers for coils in general H01F5/02)}
- H01F 27/24: Magnetic cores
- H01F 27/2828: {Construction of conductive connections, of leads}
- H01F 27/2895: {Windings disposed upon ring cores}
- H01F 30/16: Toroidal transformers
- H01F 2027/329: {Insulation with semiconducting layer, e.g. to reduce corona effect}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A transformer includes a magnetic core, a first winding and at least one second winding. The magnetic core has a window through which the first winding passes through without contacting the magnetic core. The second winding passes through the window of the magnetic core and is wound on the magnetic core. The second winding has a distance from the first winding, and a semi-conductive part is disposed between the second winding and the magnetic core. The present disclosure can effectively lower the risk of partial discharge between the second winding and the magnetic core, and thus the transformer of the present disclosure has high reliability.

## Claims

### Claim 1

A transformer comprising:
a magnetic core having a window;
a first winding passing through the window of the magnetic core without contacting the magnetic core; and
at least one second winding passing through the window of the magnetic core, the second winding is wound on the magnetic core,
wherein the second winding has a distance from the first winding, and a semi-conductive part is disposed between the second winding and the magnetic core.

### Claim 2 (depends on 1)

The transformer of claim 1, wherein the semi-conductive part is formed between the second winding and the magnetic core by dipping or spraying.

### Claim 3 (depends on 1)

The transformer of claim 1, wherein the semi-conductive part is a semi-conductive tape or a semi-conductive paint layer.

### Claim 4 (depends on 1)

The transformer of claim 1, wherein the first winding is a silicone wire.

### Claim 5 (depends on 1)

The transformer of claim 1, wherein the second winding is a triple insulated wire.

### Claim 6 (depends on 1)

The transformer of claim 1, wherein the magnetic core is in an annular shape.

### Claim 7 (depends on 6)

The transformer of claim 6, wherein the first winding perpendicularly passes through a central position of the window of the magnetic core.

### Claim 8 (depends on 1)

The transformer of claim 1, further comprising:
a bobbin having a first holding space and a second holding space therein,
wherein the first winding is disposed within the first holding space, and the magnetic core and the second winding are disposed within the second holding space.

### Claim 9 (depends on 8)

The transformer of claim 8, wherein the first winding further has an extending part, and the extending part bends and extends from one end of the first winding and is fixed outer side of the bobbin.

### Claim 10 (depends on 1)

The transformer of claim 1, wherein an insulating part is disposed on the second winding's an outer surface facing the first winding.

### Claim 11 (depends on 1)

The transformer of claim 1, wherein the second winding comprises a winding part having a first winding direction and a winding part having a second winding direction, and the first winding direction is opposite to the second winding direction.

### Claim 12 (depends on 1)

The transformer of claim 1, wherein the second winding comprises a multi-turn coil, and the multi-turn coil is uniformly distributed on the magnetic core.

### Claim 13 (depends on 1)

The transformer of claim 1, wherein an electrical potential of the magnetic core is floating.