Transformer

Patent metadata

Field	Value
Publication number	US-11600423-B2
Application number	US-201916403697-A
Country	US
Kind code	B2
Filing date	May 6, 2019
Priority date	Jun 27, 2018
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

The present disclosure provides a transformer including at least one magnetic core each having at least one window; one primary side winding passing through the at least one window, a wire forming the primary side winding being sequentially covered with a first solid insulating layer, a grounded shielding layer and a second solid insulating layer from inside to outside along a radial direction of the wire, the grounded shielding layer being connected to a reference ground; and at least one secondary side winding, each passing through the at least one window, the primary side winding having a first voltage with respect to the reference ground, the secondary side winding having a second voltage with respect to the reference ground, and the second voltage being greater than 50 times of the first voltage.

First claim

What is claimed is:

1. A transformer, comprising:
at least one magnetic core, each having at least one window;
one primary side winding passing through the at least one window of each of all the magnetic core; and
at least one secondary side winding, each passing through the at least one window of one corresponding magnetic core,
wherein a wire forms the primary side winding, and the wire is sequentially covered with a first solid insulating layer, a grounded shielding layer and a second solid insulating layer from inside to outside along a radial direction of the wire,
wherein the grounded shielding layer is connected to a reference ground,
wherein the primary side winding has a first voltage with respect to the reference ground, the secondary side winding has a second voltage with respect to the reference ground, and the second voltage is greater than 50 times of the first voltage;
wherein a space between the grounded shielding layer and the second solid insulating layer is further covered with a semi-conductive layer;
wherein the magnetic core is a circular-shaped magnetic ring; and
wherein given that an external radius of the grounded shielding layer is r, an internal radius of the magnetic ring is R, a dielectric constant of the second solid insulating layer is ε, and the second voltage is U, then a thickness d of the second solid insulating layer satisfies formulas as below:

1.2
*
U

r
⁢

⁢

ɛ
⁡

(

1
ɛ

⁢

ln
⁡

(

r
+
d

r

)

+

ln
⁡

(

R

e
+
d

)

)

≤

20
⁢

⁢
kV
⁢

/

⁢
mm

,
and

1.2
*
U

(

r
+
d

)

⁢

(

1
ɛ

⁢

ln
⁡

(

r
+
d

r

)

+

ln
⁡

(

R

e
+
d

)

)

≤

2
⁢

⁢
kV
⁢

/

⁢

mm
.

2. The transformer according to claim 1 , wherein a number of the magnetic core is at least two.

3. The transformer according to claim 1 , wherein the magnetic core is an oval-shaped, polygon-shaped or irregular-shaped magnetic ring.

4. The transformer according to claim 1 , wherein the magnetic core is a combined magnetic core having an EE shape, an EI shape, a UU shape, a UI shape, a CC shape or a CI shape.

5. The transformer according to claim 1 , wherein a peripheral surface of the magnetic ring is attached with a conductive foil layer which is electrically connected to an end of the secondary side winding.

6. The transformer according to claim 5 , wherein the conductive foil layer is a copper foil layer.

7. The transformer according to claim 1 , wherein a space between the grounded shielding layer and the second solid insulating layer is further covered with a semi-conductive layer.

8. The transformer according to claim 1 , wherein the first solid insulating layer and the second solid insulating layer both are of silicone rubber, polyethylene, polyurethane, polytetrafluoroethylene, polyvinyl chloride, polypropylene or ethylene-propylene rubber.

9. The transformer according to claim 7 , wherein the semi-conductive layer is of a polymer material doped with carbon black.

10. The transformer according to claim 9 , wherein the polymer material doped with carbon black is ethylene-vinyl acetate copolymer doped with carbon black or polyethylene doped with carbon black, having a resistivity in the range of 10 −4 ˜10 3 Ω·m.

Assignees

• Delta Electronics Inc

Inventors

• Ma Peng
• Xie Yicong
• Lan Lin
• Zhang Weiqiang

Classifications

• H01F30/10

  Single-phase transformers (H01F30/16 takes precedence) · CPC title

• H01F27/24 Primary

  Magnetic cores · CPC title

• H01F2027/329

  Insulation with semiconducting layer, e.g. to reduce corona effect · CPC title

• H01F27/324 Primary

  Insulation between coil and core, between different winding sections, around the coil; Other insulation structures · CPC title

• Y02T10/7072

  Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors · CPC title