Transformer

Patent metadata

Field	Value
Publication number	US-2020005984-A1
Application number	US-201916403697-A
Country	US
Kind code	A1
Filing date	May 6, 2019
Priority date	Jun 27, 2018
Publication date	Jan 2, 2020
Grant date	—

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.

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 a circular-shaped magnetic ring.

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

5 . 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.

6 . The transformer according to claim 3 , 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.

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

8 . The transformer according to claim 3 , 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
.

9 . 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.

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

11 . The transformer according to claim 10 , 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.

12 . 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.

Assignees

• Delta Electronics Inc

Inventors

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

Classifications

• H01F27/2885 Primary

  with shields or electrodes (shields or electrodes for pancake coils H01F27/2871; construction of electric or magnetic shields or screens H01F27/36) · CPC title

• H01F27/324 Primary

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

• H01F2027/2833

  using coaxial cable as wire · CPC title

• H01F27/24 Primary

  Magnetic cores · CPC title

• H01F27/2823

  Wires (H01F27/2866 takes precedence) · CPC title