IP Library › Granted Patent US 12706241
Granted Patent B2
US 12706241 · App. 17/987,239 · Granted Aug 11, 2026

Transformer and power equipment with long-term insulation reliability

Inventors: Zelong Zhang (Shenzhen, CN); Zhuyong Huang (Dongguan, CN); Xiaoqing Hu (Dongguan, CN); Qunyou Zhang (Shenzhen, CN); Wen Zhao (Dongguan, CN)
Assignee: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
H01F27/32H01F27/24
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Quick Facts
Patent No.
US 12706241
App. No.
17/987,239
Granted
Aug 11, 2026
Kind
B2
Abstract

This application relates to a transformer and power equipment. The transformer includes: a low-voltage coil; a high-voltage coil; a magnetic core, where at least a part of the magnetic core is penetrated through the low-voltage coil and the high-voltage coil; an insulation member with a ground plane disposed on an outer surface of the insulation member; and a voltage uniform layer. The insulation member is wrapped around the high-voltage coil, so that the high-voltage coil is insulated from the low-voltage coil and the magnetic core, heat dissipation of the high-voltage coil, low-voltage coil and the magnetic core can be facilitated, and a service life of the transformer can be prolonged. A structure of the transformer is simplified, so that installation and maintenance of the low-voltage coil and the magnetic core can be facilitated, and processing and maintenance costs of the transformer can be reduced.

Claims (49)

1 . A transformer, comprising:

a low-voltage coil;

a high-voltage coil;

a magnetic core, wherein at least a part of the magnetic core is penetrated through the low-voltage coil and the high-voltage coil; and

an insulation member wrapped around the high-voltage coil, to insulate the high-voltage coil from the low-voltage coil and the magnetic core, wherein a ground plane is disposed on at least a part of an outer surface of the insulation member; and

a voltage uniform layer is disposed between the high-voltage coil and the insulation member, the voltage uniform layer being wrapped around the high-voltage coil and electrically connected to one end of the high-voltage coil,

wherein the high-voltage coil comprises a coil body, a cable outlet portion, and a connection terminal, and wherein the insulation member comprises a body portion and an extension portion, wherein the body portion is wrapped around the coil body, wherein the extension portion is wrapped around the cable outlet portion and the part of the connection terminal;

wherein the extension portion has a first end connected to the body portion, and a thickness of the first end is greater than a thickness of the body portion, and

wherein the body portion is connected to the extension portion by using a transition portion, the transition portion being arc-shaped, wherein a cross-sectional area of the transition portion increases in a direction from the body portion to the extension portion.

2 . The transformer according to claim 1 , wherein the insulation member is wrapped around the high-voltage coil through casting.

3 . The transformer according to claim 1 , wherein a first end of the cable outlet portion is connected to the coil body, and a second end is connected to the connection terminal; and

wherein the insulation member is wrapped around the coil body, the cable outlet portion, and a part of the connection terminal, and wherein at least a part of the connection terminal is exposed.

4 . The transformer according to claim 3 , wherein a creepage distance M 1 exists between an end of the ground plane close to the connection terminal and the connection terminal, and wherein an electrical clearance H 1 exists between the end of the ground plane close to the connection terminal and the connection terminal;

wherein a creepage distance M 2 exists between an end of the low-voltage coil close to the connection terminal and the connection terminal, wherein an electrical clearance H 2 exists between the end of the low-voltage coil close to the connection terminal and the connection terminal, wherein M 2 >M 1 , and H 2 >H 1 ; and

wherein a creepage distance M 3 exists between an end of the magnetic core close to the connection terminal and the connection terminal, wherein an electrical clearance H 3 exists between the end of the magnetic core close to the connection terminal and the connection terminal, wherein M 3 >M 1 , and H 3 >H 1 .

5 . The transformer according to claim 1 ,

wherein the ground plane is wrapped around the transition portion.

6 . The transformer according to claim 1 , wherein a first installation hole is disposed in the low-voltage coil, wherein a second installation hole is disposed in the insulation member, and wherein at least a part of the magnetic core is penetrated through the first installation hole and the second installation hole and penetrated through the high-voltage coil.

7 . The transformer according to claim 1 , wherein the high-voltage coil comprises one coil body or a plurality of coil bodies connected to each other in series; and

there is one low-voltage coil or a plurality of low-voltage coils connected in series.

8 . The transformer according to claim 1 , wherein the high-voltage coil comprises one coil body or a plurality of coil bodies connected to each other in parallel; and

there is one low-voltage coil or a plurality of low-voltage coils, connected in parallel.

9 . The transformer according to claim 1 , wherein the insulation member is wrapped around the high-voltage coil through casting, wherein a first installation hole is disposed in the low-voltage coil, wherein a second installation hole is disposed in the insulation member, and wherein at least a part of the magnetic core is penetrated through the first installation hole and the second installation hole and penetrated through the high-voltage coil.

10 . The transformer according to claim 1 , wherein the insulation member is wrapped around the high-voltage coil through casting, wherein the high-voltage coil comprises one coil body or a plurality of coil bodies connected to each other in series; and

there is one low-voltage coil or a plurality of low-voltage coils connected in series.

11 . The transformer according to claim 2 , wherein the insulation member is wrapped around the high-voltage coil through casting, wherein the high-voltage coil comprises one coil body or a plurality of coil bodies connected to each other in parallel; and

there is one low-voltage coil or a plurality of low-voltage coils connected in parallel.

12 . A power equipment, comprising a transformer, the transformer comprising:

a low-voltage coil;

a high-voltage coil;

a magnetic core, wherein at least a part of the magnetic core is penetrated through the low-voltage coil and the high-voltage coil; and

an insulation member wrapped around the high-voltage coil, to insulate the high-voltage coil from the low-voltage coil and the magnetic core, and wherein a ground plane is disposed on at least a part of an outer surface of the insulation member; and

a voltage uniform layer disposed between the high-voltage coil and the insulation member, the voltage uniform layer being wrapped around the high-voltage coil and electrically connected to one end of the high-voltage coil,

wherein the high-voltage coil comprises a coil body, a cable outlet portion, and a connection terminal, and wherein the insulation member comprises a body portion and an extension portion, wherein the body portion is wrapped around the coil body, wherein the extension portion is wrapped around the cable outlet portion and the part of the connection terminal;

wherein the extension portion has a first end connected to the body portion, and a thickness of the first end is greater than a thickness of the body portion, and

wherein the body portion is connected to the extension portion by using a transition portion, the transition portion being arc-shaped, wherein a cross-sectional area of the transition portion increases in a direction from the body portion to the extension portion.

13 . The power equipment according to claim 12 , wherein the insulation member is wrapped around the high-voltage coil through casting.

14 . The power equipment according to claim 12 , wherein a first end of the cable outlet portion is connected to the coil body, and a second end is connected to the connection terminal; and

wherein the insulation member is wrapped around the coil body, the cable outlet portion, and a part of the connection terminal, and wherein at least a part of the connection terminal is exposed.

15 . The power equipment according to claim 14 , wherein a creepage distance M 1 exists between an end of the ground plane close to the connection terminal and the connection terminal, and wherein an electrical clearance H 1 exists between the end of the ground plane close to the connection terminal and the connection terminal;

wherein a creepage distance M 2 exists between an end of the low-voltage coil close to the connection terminal and the connection terminal, wherein an electrical clearance H 2 exists between the end of the low-voltage coil close to the connection terminal and the connection terminal, wherein M 2 >M 1 , and H 2 >H 1 ; and

wherein a creepage distance M 3 exists between an end of the magnetic core close to the connection terminal and the connection terminal, wherein an electrical clearance H 3 exists between the end of the magnetic core close to the connection terminal and the connection terminal, wherein M 3 >M 1 , and H 3 >H 1 .

16 . The power equipment according to claim 12 ,

wherein the ground plane is wrapped around the transition portion.

17 . The power equipment according to claim 12 , wherein a first installation hole is disposed in the low-voltage coil, wherein a second installation hole is disposed in the insulation member, and wherein at least a part of the magnetic core is penetrated through the first installation hole and the second installation hole and penetrated through the high-voltage coil.

18 . The power equipment according to claim 12 , wherein the high-voltage coil comprises one coil body or a plurality of coil bodies connected to each other in series; and

there is one low-voltage coil or a plurality of low-voltage coils connected in series.

19 . The power equipment according to claim 12 , wherein the high-voltage coil comprises one coil body or a plurality of coil bodies connected to each other in parallel; and

there is one low-voltage coil or a plurality of low-voltage coils connected in parallel.