CN215527437U

CN215527437U - Combined LLC transformer

Info

Publication number: CN215527437U
Application number: CN202122035707.4U
Authority: CN
Inventors: 陈友林; 孙标山; 李小华
Original assignee: Liweixing Electronics Shenzhen Co ltd
Current assignee: Liweixing Electronics Shenzhen Co ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2022-01-14
Anticipated expiration: 2031-08-26

Abstract

The utility model relates to a combined LLC transformer, it includes coil skeleton and encloses to close the first magnetic core and the second magnetic core in the coil skeleton outside, the interval is provided with first wire winding portion, installation department and second wire winding portion on the coil skeleton, around being equipped with primary, magnetic sheet and secondary coil respectively in first wire winding portion, installation department and the second wire winding portion, it is equipped with first heat dissipation ring and second heat dissipation ring to overlap respectively in first wire winding portion and the second wire winding portion, the periphery side of first heat dissipation ring and second heat dissipation ring is contradicted respectively on the inside wall of first magnetic core and second magnetic core, hug closely respectively on one side lateral wall of first heat dissipation ring and second heat dissipation ring in one side of primary and secondary coil. This application has the effect that improves transformer heat dispersion.

Description

Combined LLC transformer

Technical Field

The application relates to the technical field of transformers, in particular to a combined LLC transformer.

Background

Most of LLC transformers common in the market are composed of an independent resonant inductor winding and an independent main transformer, and the structure enables the mechanical size of the transformer to be large and the production cost to be high.

At present, chinese patent with publication number CN208954762U discloses an LLC transformer, which includes a bobbin, and a first magnetic core and a second magnetic core enclosed outside the bobbin, wherein a primary winding and a secondary winding are wound on the bobbin, and a magnetic sheet is disposed between the primary winding and the secondary winding, and the magnetic sheet is formed by a first magnetic body and a second magnetic body which are clamped together. Through the technical scheme, the leakage inductance of the primary winding and the secondary winding can be increased by additionally arranging the magnetic sheet, and the adjusted leakage inductance can be used as the resonant inductance to work in cooperation with the transformer, so that the resonant inductance winding does not need to be additionally and independently arranged, and the overall size of the LLC transformer is further reduced.

In view of the above-mentioned related art, the inventors consider that there is a defect that the heat dissipation effect of the transformer is not good.

SUMMERY OF THE UTILITY MODEL

In order to improve the heat dispersion of transformer, this application provides a combination type LLC transformer.

The application provides a combined LLC transformer adopts following technical scheme:

the utility model provides a combined LLC transformer, includes coil skeleton and encloses and close the first magnetic core and the second magnetic core in the coil skeleton outside, the interval is provided with first wire winding portion, installation department and second wire winding portion on the coil skeleton, around being equipped with primary, magnetic sheet and secondary coil respectively in first wire winding portion, installation department and the second wire winding portion, it is equipped with first heat dissipation ring and second heat dissipation ring to overlap respectively in first wire winding portion and the second wire winding portion, the periphery side of first heat dissipation ring and second heat dissipation ring is contradicted respectively on the inside wall of first magnetic core and second magnetic core, one side of primary and secondary coil is hugged closely respectively on one side lateral wall of first heat dissipation ring and second heat dissipation ring.

Through adopting above-mentioned technical scheme, on primary coil and the produced most heat of secondary coil during operation transmitted first cooling ring and second cooling ring respectively, first cooling ring and second cooling ring were again with heat transfer to first magnetic core and second magnetic core, and the heat rethread first magnetic core and second magnetic core give off the external world. Because the heat transfer efficiency of the first heat dissipation ring and the second heat dissipation ring is high, the heat dissipation performance of the transformer is greatly improved.

Preferably, first heat dissipation ring and second heat dissipation ring are threaded sleeve respectively and are established on first wire winding portion and second wire winding portion, the primary coil is around establishing on the first wire winding portion of keeping away from second heat dissipation ring one side at first heat dissipation ring, secondary coil is around establishing on the second wire winding portion of keeping away from first heat dissipation ring at the second heat dissipation ring.

Through adopting above-mentioned technical scheme, through rotating first heat dissipation ring and second heat dissipation ring, the mounted position of primary coil and secondary coil changes, and the interval of primary coil and secondary coil changes, and the leakage inductance of transformer changes to can improve the practicality of transformer according to the leakage inductance of the regulation transformer of production needs adaptability.

Preferably, corrugated portions are arranged on the sides, far away from each other, of the first heat dissipation ring and the second heat dissipation ring.

Through adopting above-mentioned technical scheme, through setting up the ripple portion, can increase the surface area of first cooling ring and second cooling ring to increase the heat radiating area of first cooling ring and second cooling ring, the radiating effect of first cooling ring and second cooling ring is better.

Preferably, the two corrugated portions each include a peak section and a valley section, and the two peak sections are respectively attached to the primary coil and the secondary coil.

Through adopting above-mentioned technical scheme, primary coil and secondary coil are hugged closely respectively to two crest sections to guarantee to have sufficient area of contact between first cooling ring and second cooling ring and primary coil and the secondary coil, on heat transmission on primary coil and the secondary coil can be quick reaches first cooling ring and second cooling ring, the external world is gived off with the heat to first magnetic core of rethread and second magnetic core.

Preferably, a heat conducting layer is arranged on the wave peak section.

Through adopting above-mentioned technical scheme, can be more abundant transmit the heat on primary coil and the secondary coil to first radiating ring and second radiating ring through the heat-conducting layer.

Preferably, the side walls of the first winding portion and the second winding portion, which are close to the mounting portion, are provided with heat insulation layers.

Through adopting above-mentioned technical scheme, can prevent through the insulating layer that a large amount of heat transfer from to in the installation department to prevent that the magnetic sheet from weakening because of being heated magnetism, and then influencing the leakage inductance of transformer.

Preferably, a plurality of first heat dissipation holes are formed in positions, corresponding to the first winding portion and the second winding portion, of the first magnetic core and the second magnetic core at intervals.

By adopting the technical scheme, through arranging the first heat dissipation holes, part of heat generated by the primary coil and the secondary coil can be directly dissipated to the outside through the first heat dissipation holes, so that the heat dissipation performance of the transformer is improved.

Preferably, a plurality of heat conduction holes are circumferentially spaced on the side wall of the side, away from each other, of the first winding portion and the second winding portion, and a plurality of second heat dissipation holes are circumferentially spaced on the positions, corresponding to the heat conduction holes, of the first magnetic core and the second magnetic core.

By adopting the technical scheme, part of heat generated by the primary coil and the secondary coil is dissipated to the outside through the heat conduction holes and the second heat dissipation holes, so that the heat dissipation performance of the transformer is further improved.

In summary, the present application includes at least one of the following beneficial technical effects:

(1) most of heat generated by the primary coil and the secondary coil during working is respectively transferred to the first heat dissipation ring and the second heat dissipation ring, the first heat dissipation ring and the second heat dissipation ring transfer heat to the first magnetic core and the second magnetic core, and the heat is further dissipated to the outside through the first magnetic core and the second magnetic core. The heat dissipation performance of the transformer is greatly improved due to the high heat transfer efficiency of the first heat dissipation ring and the second heat dissipation ring;

(2) by rotating the first heat dissipation ring and the second heat dissipation ring, the mounting positions of the primary coil and the secondary coil are changed, the distance between the primary coil and the secondary coil is changed, and the leakage inductance of the transformer is changed, so that the leakage inductance of the transformer can be adaptively adjusted according to production requirements, and the practicability of the transformer is improved;

(3) through setting up the ripple portion, can increase the surface area of first cooling ring and second cooling ring to increase the heat radiating area of first cooling ring and second cooling ring, the radiating effect of first cooling ring and second cooling ring is better.

Drawings

Fig. 1 is a schematic structural diagram of a transformer according to an embodiment of the present application;

fig. 2 is an exploded view of a transformer according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a bobbin according to an embodiment of the present application.

Description of reference numerals: 1. a first magnetic core; 2. a second magnetic core; 3. a coil bobbin; 4. a primary coil; 5. a first heat dissipation ring; 6. a magnetic sheet; 7. a second heat dissipation ring; 8. a secondary coil; 9. a first limit plate; 10. a second limiting plate; 11. a first separator; 12. a second separator; 13. a first winding portion; 14. an installation part; 15. a second winding portion; 16. a corrugated portion; 17. a peak band; 18. a wave trough section; 19. a heat conductive layer; 20. a thermal insulation layer; 21. a first heat dissipation hole; 22. a heat conduction hole; 23. a second heat dissipation hole.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a combined LLC transformer. Referring to fig. 1 and 2, the combined LLC transformer includes a first magnetic core 1, a second magnetic core 2, a bobbin 3, a primary coil 4, a first heat dissipation ring 5, a magnetic sheet 6, a second heat dissipation ring 7, and a secondary coil 8. Wherein, primary coil 4, first heat dissipation ring 5, magnetic sheet 6, second heat dissipation ring 7 and secondary coil 8 are around establishing on coil skeleton 3 in proper order, and first magnetic core 1 and second magnetic core 2 enclose to close in coil skeleton 3's the outside.

Specifically, referring to fig. 2, the two ends of the coil bobbin 3 are respectively fixedly sleeved with a first limiting plate 9 and a second limiting plate 10, and a first partition plate 11 and a second partition plate 12 are fixedly sleeved on the coil bobbin 3 between the first limiting plate 9 and the second limiting plate 10 at intervals. A first winding portion 13 is formed between the first stopper plate 9 and the first partition plate 11, an installation portion 14 is formed between the first partition plate 11 and the second partition plate 12, and a second winding portion 15 is formed between the second partition plate 12 and the second stopper plate 10.

The first heat dissipation ring 5 and the second heat dissipation ring 7 are respectively sleeved on the first winding portion 13 and the second winding portion 15, and the outer peripheral sides of the first heat dissipation ring 5 and the second heat dissipation ring 7 respectively abut against the inner side walls of the first magnetic core 1 and the second magnetic core 2. The primary coil 4 is wound around a first winding portion 13 provided between the first stopper plate 9 and the first heat dissipating ring 5, the magnetic sheet 6 is caught on the mounting portion 14, and the secondary coil 8 is wound around a second winding portion 15 provided between the second heat dissipating ring 7 and the second stopper plate 10.

When the transformer works, most of heat generated by the primary coil 4 and the secondary coil 8 during working is respectively transmitted to the first radiating ring 5 and the second radiating ring 7, the heat is rapidly transmitted to the first magnetic core 1 and the second magnetic core 2 through the high heat transfer efficiency of the first radiating ring 5 and the second radiating ring 7, and then is transmitted to the outside through the first magnetic core 1 and the second magnetic core 2, so that the heat dissipation performance of the transformer is greatly improved.

In the present embodiment, the first heat dissipating ring 5 and the second heat dissipating ring 7 are made of aluminum alloy, and in other embodiments, other materials having good heat conductivity may be used.

In the present embodiment, the structures and the mounting structures of the first heat dissipation ring 5 and the second heat dissipation ring 7 are the same, and the structures and the mounting structures of the first heat dissipation ring 5 and the second heat dissipation ring 7 will be further described in detail below by taking the drawings showing the first heat dissipation ring 5 as an example.

The first winding portion 13 and the second winding portion 15 are both provided with threads (not shown in the figure), and the first heat dissipation ring 5 and the second heat dissipation ring 7 are respectively sleeved on the first winding portion 13 and the second winding portion 15 in a threaded manner. Rotate first cooling ring 5 and second cooling ring 7, the interval between first cooling ring 5 and second cooling ring 7 and first limiting plate 9 and the second limiting plate 10 changes, and the interval of primary coil 4 and secondary coil 8 also changes, and the leakage inductance of transformer changes to can be according to the leakage inductance of the adjusting transformer of production needs adaptability, improve the practicality of transformer.

Referring to fig. 3, the first heat dissipating ring 5 and the second heat dissipating ring 7 are provided with corrugations 16 on the sides away from each other, each of the two corrugations 16 includes a peak section 17 and a valley section 18 which are continuously arranged, and the two peak sections 17 are respectively attached to one side of the primary coil 4 and one side of the secondary coil 8.

By providing the corrugated portion 16, the surface areas of the first heat dissipation ring 5 and the second heat dissipation ring 7 can be increased, thereby increasing the heat dissipation areas of the first heat dissipation ring 5 and the second heat dissipation ring 7. And two peak sections 17 are respectively clung to the primary coil 4 and the secondary coil 8, so that enough contact areas can be ensured between the first radiating ring 5 and the second radiating ring 7 and between the primary coil 4 and the secondary coil 8, heat on the primary coil 4 and the secondary coil 8 can be quickly transferred to the first radiating ring 5 and the second radiating ring 7, and then the heat is radiated to the outside through the first magnetic core 1 and the second magnetic core 2.

A heat conductive layer 19 is disposed over the peak section 17. When the first heat dissipation ring 5 and the second heat dissipation ring 7 are produced, the surfaces of the first heat dissipation ring 5 and the second heat dissipation ring 7 inevitably have pits in which air exists, and the air is a poor conductor of heat, so that the heat conduction layer 19 can fill the pits by arranging the heat conduction layer 19, so that the heat on the primary coil 4 and the secondary coil 8 is more fully transferred to the first heat dissipation ring 5 and the second heat dissipation ring 7.

In this embodiment, the heat conduction layer 19 is made of heat conductive silicone, and in other embodiments, the heat conduction layer 19 may also be made of a material with good heat conductivity, such as potting adhesive.

The side of the first clapboard 11 close to the first radiating ring 5 and the side of the second clapboard 12 close to the second radiating ring 7 are both provided with a heat insulating layer 20. Since the magnetic sheet 6 is heated, the magnetic property is weakened, and the leakage inductance of the transformer is affected, the heat insulating layer 20 is provided to prevent a large amount of heat from being transferred to the mounting portion 14, so that the magnetic property of the magnetic sheet 6 is kept relatively stable.

In this embodiment, the material of the thermal insulation layer 20 is aerogel, and in other embodiments, other materials with good thermal insulation effect may also be used.

Referring to fig. 2, a plurality of first heat dissipation holes 21 are formed at positions of the first magnetic core 1 and the second magnetic core 2 corresponding to the first winding portion 13 and the second winding portion 15 at intervals. A part of heat generated from the primary coil 4 and the secondary coil 8 can be directly dissipated to the outside through the first heat dissipation holes 21, and at the same time, heat on the first heat dissipation ring 5 and the second heat dissipation ring 7 can be also dissipated through the first heat dissipation holes 21, thereby improving the heat dissipation performance of the transformer.

Referring to fig. 2 and 3, a plurality of heat conduction holes 22 are circumferentially spaced on the first limiting plate 9 and the second limiting plate 10, and a plurality of second heat dissipation holes 23 are circumferentially spaced on positions of the first magnetic core 1 and the second magnetic core 2 corresponding to the heat conduction holes 22. A part of heat generated by the primary coil 4 and the secondary coil 8 is dissipated to the outside through the heat conduction hole 22 and the second heat dissipation hole 23, thereby further improving the heat dissipation performance of the transformer.

The implementation principle of the combined LLC transformer of the embodiment of the application is as follows: most of heat generated by the primary coil 4 and the secondary coil 8 during working is respectively transferred to the first heat dissipation ring 5 and the second heat dissipation ring 7, the first heat dissipation ring 5 and the second heat dissipation ring 7 transfer the heat to the first magnetic core 1 and the second magnetic core 2, and the heat is dissipated to the outside through the first magnetic core 1 and the second magnetic core 2. The first heat dissipation hole 21, the heat conduction hole 22, and the second heat dissipation hole 23 provide additional heat dissipation channels for the primary coil 4 and the secondary coil 8. In conclusion, the heat dissipation performance of the transformer is greatly improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a combined LLC transformer, includes coil skeleton (3) and encloses and close first magnetic core (1) and second magnetic core (2) in coil skeleton (3) outside, the interval is provided with first winding portion (13), installation department (14) and second winding portion (15) on coil skeleton (3), on first winding portion (13), installation department (14) and second winding portion (15) respectively around being equipped with primary coil (4), magnetic sheet (6) and secondary coil (8), its characterized in that: the heat dissipation device is characterized in that a first heat dissipation ring (5) and a second heat dissipation ring (7) are sleeved on the first winding portion (13) and the second winding portion (15) respectively, the outer peripheral sides of the first heat dissipation ring (5) and the second heat dissipation ring (7) are abutted to the inner side wall of the first magnetic core (1) and the inner side wall of the second magnetic core (2) respectively, and one side of the primary coil (4) and one side of the secondary coil (8) are tightly attached to the side wall of one side of the first heat dissipation ring (5) and one side of the second heat dissipation ring (7) respectively.

2. The combined LLC transformer of claim 1, wherein: first cooling ring (5) and second cooling ring (7) threaded sleeve respectively establish on first wire winding portion (13) and second wire winding portion (15), primary coil (4) are around establishing on first wire winding portion (13) of keeping away from second cooling ring (7) one side at first cooling ring (5), secondary coil (8) are around establishing on second wire winding portion (15) of keeping away from first cooling ring (5) at second cooling ring (7).

3. The combined LLC transformer of claim 2, wherein: corrugated parts (16) are arranged on the sides, far away from each other, of the first radiating ring (5) and the second radiating ring (7).

4. A combined LLC transformer as claimed in claim 3, characterized in that: the two corrugated parts (16) respectively comprise a peak section (17) and a trough section (18), and the two peak sections (17) are respectively tightly attached to the primary coil (4) and the secondary coil (8).

5. The combined LLC transformer of claim 4, wherein: and the wave crest section (17) is provided with a heat conduction layer (19).

6. The combined LLC transformer of claim 1, wherein: and heat insulation layers (20) are arranged on the side walls of the first winding part (13) and the second winding part (15) close to the mounting part (14).

7. The combined LLC transformer of claim 1, wherein: a plurality of first heat dissipation holes (21) are formed in positions, corresponding to the first winding portion (13) and the second winding portion (15), of the first magnetic core (1) and the second magnetic core (2) at intervals.

8. The combined LLC transformer of claim 1, wherein: the first winding portion (13) and the second winding portion (15) are arranged on the side wall, away from each other, of the side wall, and are circumferentially spaced to form a plurality of heat conduction holes (22), and the first magnetic core (1) and the second magnetic core (2) are arranged on the positions, corresponding to the heat conduction holes (22), of the side wall, and are circumferentially spaced to form a plurality of second heat dissipation holes (23).