High-voltage transformer and electronic power apparatus

Patent metadata

Field	Value
Publication number	US-11250990-B2
Application number	US-202016856682-A
Country	US
Kind code	B2
Filing date	Apr 23, 2020
Priority date	Jan 25, 2017
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

A high-voltage transformer includes a magnetic core; at least a secondary coil unit including at least one secondary winding; at least a primary coil unit, comprising at least one primary winding and a first insulating portion, the first insulating portion forming at least one through hole, the primary winding encircling the through hole and being wrapped by the first insulating portion and fixed in the first insulating portion, the magnetic core passing through the through hole, a shielding layer being formed on a surface of the first insulating portion, and the shielding layer being used for connecting a safety ground; a second insulating portion formed by extending the first insulating portion; a first retaining wall presented in a closed ring shape, arranged on an end periphery of the second insulating portion; and a second retaining wall arranged in the first retaining wall.

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;
at least a primary coil unit, comprising at least one primary winding and a first insulating portion, the first insulating portion forming at least one through hole, the primary winding encircling the through hole and being wrapped by the first insulating portion and fixed in the first insulating portion, the magnetic core passing through the through hole, a shielding layer being formed on a surface of the first insulating portion, and the shielding layer being used for connecting a safety ground;
a second insulating portion formed by extending the first insulating portion in a direction away from the primary coil unit, wherein the primary coil unit is provided with two outgoing lines, ends of the outgoing lines are provided with connection terminals, and the outgoing lines and at least a part of the connection terminals are embedded in the second insulating portion;
a first retaining wall presented in a closed ring shape, arranged on an end periphery of the second insulating portion, and extending in a direction away from the primary coil unit; and
a second retaining wall arranged in the first retaining wall, and having one end connected to the second insulating portion and the other end extending in a direction away from the primary coil unit, wherein the second retaining wall is higher than the connection terminal and partitions the two connection terminals.

2. The high voltage transformer of claim 1 , wherein the high voltage transformer further comprises:
a third retaining wall presented in a closed ring shape, arranged on the end periphery of the second insulating portion, and extending in a direction away from the primary coil unit, wherein the third retaining wall is positioned in the first retaining wall and has a distance from the first retaining wall.

3. The high voltage transformer of claim 2 , wherein a height of the third retaining wall is higher than, lower than or equal to a height of the first retaining wall.

4. The high voltage transformer of claim 1 , wherein an outer surface of the first retaining wall and an outer surface of the second insulating portion are provided with an umbrella skirt.

5. The high voltage transformer of claim 1 , wherein the first retaining wall and the second insulating portion are integrally formed; and/or the second retaining wall and the second insulating portion are integrally formed.

6. The high voltage transformer of claim 2 , wherein the third retaining wall and the second insulating portion are integrally formed.

7. 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 first insulating portion of the primary coil unit is one, and the second column passes through the through hole.

8. 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 first 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.

9. The high-voltage transformer according to claim 8 , wherein the secondary coil unit is arranged at the first column.

10. The high-voltage transformer according to claim 8 , wherein the secondary coil unit is arranged at the second column.

11. The high-voltage transformer according to claim 8 , wherein a 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.

12. The high-voltage transformer according to claim 8 , 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.

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

14. 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.

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 shielding layer covers more than 90% of the surface of the first insulating portion.

17. A high-voltage transformer, comprising:
a secondary coil unit, comprising at least one secondary winding;
a primary coil unit, comprising at least one primary winding and a first insulating portion, the first 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 first insulating portion and fixed in the first insulating portion, a shielding layer being formed on a surface of the first insulating portion, and the shielding layer being used for connecting a safety ground;
a second insulating portion formed by extending the first insulating portion in a direction away from the primary coil unit, wherein the primary coil unit is provided with two outgoing lines, the ends of the outgoing lines are provided with connection terminals, and the outgoing lines and at least a part of the connection terminals are embedded in the second insulating portion;
a first retaining wall presented in a closed ring shape, arranged on the end periphery of the second insulating portion, and extending in a direction away from the primary coil unit; and
a second retaining wall arranged in the first retaining wall, and having one end connected to the second insulating portion and the other end extending in a direction away from the primary coil unit, wherein the second retaining wall is higher than the connection terminal and partitions the two connection terminals.

Assignees

• Delta Electronics Shanghai Co

Inventors

• Zhang Quanliang
• Zhou Min
• Guo Shizhong

Classifications

• H01F27/324

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

• H01F27/363

  made of electrically conductive material · 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

• H01F38/42 Primary

  Flyback transformers · CPC title

• H01F27/04

  Leading of conductors or axles through casings, e.g. for tap-changing arrangements · CPC title