High-voltage transformer and electronic power apparatus

Patent metadata

Field	Value
Publication number	US-11417456-B2
Application number	US-201816197784-A
Country	US
Kind code	B2
Filing date	Nov 21, 2018
Priority date	Jan 25, 2017
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

The present disclosure provides a high-voltage transformer and an electronic power apparatus. The high-voltage transformer includes a magnetic core, a secondary coil unit, and a primary coil unit. The secondary coil unit includes a secondary winding; and the primary coil unit includes a primary winding and an insulating portion. The insulating portion forms at least one through hole. At least one primary winding encircle at least one through hole and is wrapped by the insulating portion and fixed in the insulating portion. The magnetic core passes through at least one through hole. A shielding layer is formed on a surface of the insulating portion, and the shielding layer is used for connecting a safety ground and the electrical conductivity of the shielding layer is not more than 5000 S/m.

First claim

What is claimed is:

1. A high-voltage transformer, comprising:
a magnetic core;
at least a secondary coil unit, comprising at least one secondary winding; and
at least a primary coil unit, comprising at least one primary winding and an insulating portion, the insulating portion forming at least one through hole, the primary winding encircling the through hole and being wrapped by the insulating portion and fixed in the insulating portion, the magnetic core passing through the through hole, a shielding layer being formed on a surface of the insulating portion, and the shielding layer being used for connecting a safety ground, an electrical conductivity of the shielding layer is not more than 5000 S/m.

2. The high-voltage transformer according to claim 1 , wherein the shielding layer covers more than 90% of the surface of the insulating portion.

3. The high-voltage transformer according to claim 1 , wherein the shielding layer is a mixture consisting of a metal and an insulating material, or a mixture consisting of a carbon brazing and an insulating material, or a mixture consisting of a metal and a metal oxides.

4. The high-voltage transformer according to claim 1 , wherein the shielding layer is made from 20% to 30% by weight of steel fiber and from 70% to 80% by weight of nylon, or from 25% to 35% by weight of carbon black and from 65% to 75% by weight of PPS, or from 15% to 25% by weight of Ti and from 75% to 85% by weight of TiO 2 .

5. The high-voltage transformer according to claim 1 , wherein the shielding layer has a thickness of 0.1-0.3 mm.

6. The high-voltage transformer according to claim 1 , wherein the shielding layer is a conductive layer, and is formed on the surface of the insulating portion by affixing, electroplating, evaporating, pouring or spraying.

7. The high-voltage transformer according to claim 1 , wherein the shielding layer is provided with a grounded terminal used for connecting the shielding layer to the safety ground.

8. The high-voltage transformer according to claim 1 , wherein a maximum voltage against ground of the primary coil unit is greater than 2 kV, and a ratio of the maximum voltage against ground of the primary coil unit to a maximum voltage against ground of the secondary coil unit is not less than 5 .

9. The high-voltage transformer according to claim 1 , wherein the primary coil unit comprises a plurality of the primary windings, and the plurality of the primary windings are electrically connected in parallel or in series with each other.

10. The high-voltage transformer according to claim 1 , wherein the magnetic core comprises a first column and a second column, the secondary coil unit is arranged at the first column, and the primary coil unit is arranged at the second column, wherein the number of the through hole formed by the insulating portion of the primary coil unit is one, and the second column passes through the through hole.

11. The high-voltage transformer according to claim 1 , wherein the magnetic core at least comprises a first column and a second column, the number of the through hole formed by the insulating portion of the primary coil unit is at least two, and the first column and the second column respectively pass through the two through holes.

12. The high-voltage transformer according to claim 11 , wherein the secondary coil unit is arranged at the first column and/or the second column.

13. The high-voltage transformer according to claim 11 , wherein an projection of the secondary winding of the secondary coil unit on the magnetic core is not overlapped with that of the primary winding of the primary coil unit on the magnetic core.

14. The high-voltage transformer according to claim 11 , wherein the primary coil unit comprises two primary windings, the two primary windings respectively encircle the two through holes; the secondary coil unit comprises four secondary windings, wherein two of the four secondary windings are arranged at two sides of the primary coil unit at the first column, and the other two of the four secondary windings are arranged at two sides of the primary coil unit at the second column.

15. The high-voltage transformer according to claim 1 , wherein the shielding layer has a gap to prevent the shielding layer from forming a closed conductive circuit.

16. The high-voltage transformer according to claim 1 , wherein the insulating portion is made from a resin.

17. The high-voltage transformer according to claim 1 , wherein the primary coil unit comprises a plurality of the primary windings, and the plurality of the primary windings are not physically connected with each other in the insulating portion.

18. A high-voltage transformer, comprising:
a secondary coil unit, comprising at least one secondary winding; and
a primary coil unit, comprising at least one primary winding and an insulating portion, the insulating portion forming at least one through hole, the at least one primary winding encircling the at least one through hole and being wrapped by the insulating portion and fixed in the insulating portion, a shielding layer being formed on a surface of the insulating portion, and the shielding layer being used for connecting a safety ground, an electrical conductivity of the shielding layer is not more than 5000 S/m.

19. An electronic power apparatus, comprising a high-voltage transformer, wherein the high-voltage transformer comprises:
a magnetic core;
a secondary coil unit, comprising at least one secondary winding; and
a primary coil unit, comprising at least one primary winding and an insulating portion, the insulating portion forming at least one through hole, the at least one primary winding encircling the at least one through hole and being wrapped by the insulating portion and fixed in the insulating portion, the magnetic core passing through the at least one through hole, a shielding layer being formed on a surface of the insulating portion, and the shielding layer being connected to a safety ground, an electrical conductivity of the shielding layer is not more than 5000 S/m.

Assignees

• Delta Electronics Shanghai Co

Inventors

• Zhang Quanliang

Classifications

• H01F27/36

  Electric or magnetic shields or screens (movable for varying inductance H01F21/10) · CPC title

• H01F27/324

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

• 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

• H01F27/363

  made of electrically conductive material · CPC title

• H01F27/366

  made of ferromagnetic material · CPC title