CN109461563A - A kind of high frequency transformer and its manufacturing method - Google Patents
A kind of high frequency transformer and its manufacturing method Download PDFInfo
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- CN109461563A CN109461563A CN201811444573.8A CN201811444573A CN109461563A CN 109461563 A CN109461563 A CN 109461563A CN 201811444573 A CN201811444573 A CN 201811444573A CN 109461563 A CN109461563 A CN 109461563A
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- coil
- magnetic core
- high frequency
- frequency transformer
- yoke
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—Cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The present invention relates to a kind of high frequency transformer and its manufacturing methods.The high frequency transformer includes magnetic core, magnetic core includes the magnetic pole for wound around coil and the upper yoke positioned at magnetic pole upper and lower ends and lower yoke, coil is wound in magnetic pole, the external casting solidification of coil has coil insulator, being coated between insulating layer, coil insulator and upper yoke and/or lower yoke in upper yoke and lower yoke has heat dissipation gap.The upper yoke of magnetic core in high frequency transformer of the invention and/or lower yoke and casting, which are solidificated between the coil insulator of coil outer, has heat dissipation gap, and insulating layer is coated on upper yoke and lower yoke, the insulating layer in high frequency transformer fully wrapped around firmly magnetic core, primary coil and secondary coil in compared with the prior art, the present invention is in the case where equally guaranteeing high frequency transformer integral insulation, the heat dissipation performance of magnetic core and coil is significantly enhanced, to reduce the temperature rise of high frequency transformer.
Description
Technical field
The present invention relates to field transformers, and in particular to a kind of high frequency transformer and its manufacturing method.
Background technique
Transformer is a kind of principle using electromagnetic induction to change the device of alternating voltage.The major function of transformer
Have: voltage transformation, current transformation, impedance transformation, isolation and pressure stabilizing etc..Transformer is made of iron core and coil, and there are two coils
Or more than two windings, coil include primary coil and secondary coil, wherein primary coil is the winding for connecing power supply, remaining
Winding secondary coil.It can convert alternating voltage, electric current and impedance, and simplest appendiron core transformer is by a soft magnetism material
Expect the iron core being made into and two the number of turns being set on iron core not equal coil composition.Wherein, the effect of iron core is to reinforce two
Magnetic coupling between coil.
The type of transformer is varied, common are oil-immersed transformer and dry-type transformer.The maximum difference of the two
It is " oily formula " and " dry type ", i.e. the cooling medium of the two is different, the former is mainly using transformer oil as cooling and insulation Jie
Matter, the latter are using air or other gases as cooling medium.Wherein, dry-type transformer is by iron core and winding asphalt mixtures modified by epoxy resin
Rouge casting is encapsulated, and has many advantages, such as that structure is simple, small in size, high mechanical strength.
Such dry-type transformer of the prior art, such as the Chinese utility model patent that Authorization Notice No. is CN205723120U
A kind of high voltage high frequency transformer of disclosed single-phase high-power special insulation structure, the transformer include shell and are arranged in shell
Interior iron core, the low pressure interior loop being wound in core mandrel, the high pressure exterior loop for being wound on low pressure interior loop periphery and company
The lead on the leading-out terminal of high pressure exterior loop is connect, lead is pierced by shell, between low pressure interior loop and core mandrel, in low pressure
Between coil and high pressure exterior loop, epoxy resin insulating layers are respectively provided between iron core and shell, i.e. insulating resin layer wraps iron
Core, primary coil and secondary coil；It is poor that this allows for iron core, primary coil and secondary coil heat dissipation performance, leads to transformer
Temperature rise is very fast, and transformer performance and service life are restricted.
Summary of the invention
The purpose of the present invention is to provide a kind of high frequency transformers, relatively high to solve existing high frequency transformer temperature rise,
The problem of influencing the performance and used life of transformer；The object of the invention is also to provide a kind of manufacturers of high frequency transformer
Method causes high frequency transformer temperature rise relatively high, influences the performance and used life of transformer to solve existing manufacturing method
Problem.
To achieve the above object, the technical solution of high frequency transformer of the invention is:
High frequency transformer includes magnetic core, and magnetic core includes the magnetic pole for wound around coil and the upper yoke positioned at magnetic pole upper and lower ends under
Yoke is wound with coil in magnetic pole, and the external casting solidification of coil has coil insulator, is coated with insulating layer on upper yoke and lower yoke,
There is heat dissipation gap between coil insulator and upper yoke and/or lower yoke.
The beneficial effect is that: the upper yoke of the magnetic core in high frequency transformer of the invention and/or lower yoke are solidificated in casting
There is heat dissipation gap between the coil insulator of coil outer, and be coated with insulating layer on upper yoke and lower yoke, compared to existing
The insulating layer in high frequency transformer fully wrapped around firmly magnetic core, primary coil and secondary coil, the present invention in technology are equally protecting
In the case where demonstrate,proving high frequency transformer integral insulation, the heat dissipation performance of magnetic core and coil is significantly enhanced, to reduce high frequency change
The temperature rise of depressor.
Further, the magnetic core is formed by stacking by least two nanocrystalline bands, and insulating layer is poured into coil insulator
It is poured and is solidificated on magnetic core before coil.Magnetic core can be done the sectional area of magnetic core using at least two nanocrystalline band superposition supports
It is very big, help to produce high-power high-frequency transformer.
Further, the section of the magnetic core is rectangle, and there are two magnetic poles, the coil is wound in each magnetic pole, respectively
Magnetic pole coil includes primary coil and secondary coil, and insulating materials is provided between primary coil and secondary coil.Enhancing
Insulation performance between primary coil and secondary coil.
Further, the coil uses litz wire.Keep the electric current of each wire uniform using litz wire.
The technical solution of the manufacturing method of high frequency transformer of the invention is:
The manufacturing method of high frequency transformer includes the steps that the wound around coil in the magnetic pole of magnetic core, in magnetic pole wound around coil it
Before, insulating layer first is coated in the upper yoke of magnetic core and lower yoke, after coil is wrapped in magnetic pole, in the external molded coil of coil
Insulator has heat dissipation gap between the coil insulator and upper yoke and/or lower yoke after casting.
The beneficial effect is that: it is solid using the upper yoke of the magnetic core in high frequency transformer of the invention and/or lower yoke and casting
Change has heat dissipation gap between the coil insulator of coil outer, can increase the heat loss through convection of magnetic core and coil and air；And
And be coated with insulating layer on upper yoke and lower yoke, compared with the prior art in high frequency transformer in insulating layer it is fully wrapped around live magnetic
Core, primary coil and secondary coil, the present invention equally guarantee high frequency transformer integral insulation in the case where, increase magnetic core and
The heat loss through convection of coil and air significantly enhances the heat dissipation performance of magnetic core and coil, to reduce the temperature of high frequency transformer
It rises.
Further, the magnetic core is formed by stacking by least two nanocrystalline bands, and insulating layer is poured into coil insulator
It is poured and is solidificated on magnetic core before coil.Magnetic core can be done the sectional area of magnetic core using at least two nanocrystalline band superposition supports
It is very big, help to produce high-power high-frequency transformer.
Further, the section of the magnetic core is rectangle, and there are two magnetic poles, the coil is wound in each magnetic pole, respectively
Magnetic pole coil includes primary coil and secondary coil, and insulating materials is provided between primary coil and secondary coil.Enhancing
Insulation performance between primary coil and secondary coil.
Further, the coil uses litz wire.Keep the electric current of each wire uniform using litz wire.
Detailed description of the invention
Fig. 1 is the main view of the magnetic core in high frequency transformer of the invention；
Fig. 2 is the left view of the magnetic core in high frequency transformer of the invention；
Fig. 3 is the magnetic core of high frequency transformer of the invention and the structural schematic diagram of insulator；
Fig. 4 is the top view of the magnetic core and insulator in Fig. 3；
Fig. 5 is the left view of the magnetic core and insulator in Fig. 3；
In figure: 1- magnetic core；11- upper yoke；Yoke under 12-；13- magnetic pole；The nanocrystalline band of 14- first；The nanocrystalline band of 15- second；2- is exhausted
Edge body；3- primary coil；4- secondary coil.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
The specific embodiment one of high frequency transformer of the invention, as shown in figure 3, including magnetic core 1 and being wrapped on magnetic core 1
Primary coil 3 and secondary coil 4.Wherein, magnetic core 1 includes magnetic pole 13 and upper yoke 11 and lower yoke positioned at 13 upper and lower ends of magnetic pole
12.As shown in Figure 1, the section of magnetic core 1 is rectangle, i.e., there are two the magnetic poles 13 between the lower yoke 12 of upper yoke 11, in two magnetic poles 13
It is respectively arranged with primary coil 3 and secondary coil 4, secondary coil 4 attaches magnetic pole 13 and arranges, primary coil 3 is located at secondary coil 4
Outside, and insulating materials is provided between secondary coil 4 and primary coil 3, insulating materials specifically can be insulating paper.Such as
Shown in Fig. 2, Fig. 4, Fig. 5, the outside of secondary coil 4 and primary coil 3 is provided with the cured insulator 2 of casting, the thickness of insulator 2
Degree is greater than the thickness of upper yoke 11 and the insulating layer on lower yoke 12, and the insulator 2 in the present embodiment is epoxy resin, and epoxy resin is exhausted
Certain interval is all had between edge body 2 and upper yoke 11 and lower yoke 12 to enhance the heat dissipation of magnetic core 1, primary coil 3 and secondary coil 4
Performance, so that magnetic core 1 and epoxyresin insulator 2 are in cross-shaped structure.
Magnetic core 1 in the present embodiment is made using nanocrystalline band, is limited by nanocrystalline strip material technological lag, single nanometer
Crystal zone is difficult to be made very big.As shown in Fig. 2, in order to increase the power of high frequency transformer of the invention, the present embodiment as far as possible
In magnetic core 1 by identical nanocrystalline band (the i.e. first nanocrystalline band 14, the second nanocrystalline band 15) the superposition bonding system of two specifications
At certainly, the magnetic core 1 in other embodiments can be to be made of the nanocrystalline band superposition bondings such as three, four, five, each
The specification of nanocrystalline band can also be different.The section of first nanocrystalline band 14 and the second nanocrystalline band is rectangular configuration, to be formed
Upper yoke 11, lower yoke 12 and the magnetic pole 13 between upper and lower yoke.Also be cast with outside two bonding nanocrystalline bands one layer compared with
Thin epoxy resin insulating layers, one can guarantee that the overall structure of magnetic core 1 is fixed, and two, which can form protection to magnetic core 1, makees
With three do not influence the heat dissipation of magnetic core 1.
In order to reduce kelvin effect bring loss under high frequency state and reduce eddy-current loss, primary coil 3 and secondary
Coil 4 is all made of litz wire.
The specific embodiment two of high frequency transformer of the invention, with being in for the difference of the embodiment one of high frequency transformer
In the magnetic core in the present embodiment is made of an individual nanocrystalline band, other are the same as example 1, and repeat no more.
The specific embodiment three of high frequency transformer of the invention, with being in for the difference of the embodiment one of high frequency transformer
In the section of the magnetic core in the present embodiment is circular ring shape, and toroidal cores are segmented into four sections, is constituted for corresponding two sections up and down
Yoke and lower yoke, the corresponding two sections of compositions magnetic pole in left and right.In other embodiments, the section of magnetic core can also be the shapes such as stud.
Other are the same as example 1, and repeat no more.
The specific embodiment four of high frequency transformer of the invention, with being in for the difference of the embodiment one of high frequency transformer
In primary coil and secondary coil in the present embodiment use copper belt, other are the same as example 1, and repeat no more.
The specific embodiment five of high frequency transformer of the invention, with being in for the difference of the embodiment one of high frequency transformer
Only there is certain interval between upper yoke in, epoxyresin insulator in the present embodiment, in other embodiments, epoxy resin is exhausted
Edge body can also only have heat dissipation gap between lower yoke.Other are the same as example 1, and repeat no more.
The embodiment of the manufacturing method of high frequency transformer of the invention, comprising the following steps: first that two specifications are identical
Magnetic core is made for the nanocrystalline band superposition bonding of rectangle in section, and an integrated poured layer insulating outside magnetic core, on reaching
The purpose of yoke and lower yoke cladding insulating layer；Then the primary coil for using litz wire and secondary coil are wrapped in the magnetic pole of magnetic core
Insulating layer above and between primary magnetic core and secondary magnetic core is set；Finally asphalt mixtures modified by epoxy resin is poured outside primary coil and secondary coil
Rouge insulator, and make that there is certain interval between epoxyresin insulator and upper yoke and lower yoke.
In other embodiments, magnetic core is also possible to be made of single nanocrystalline band or multiple nanocrystalline band bondings；Primary line
Circle and secondary coil can also use copper belt；The section of magnetic core is also possible to the other shapes such as circular ring shape or stud；Epoxy
Resin insulating barrier can also only have heat dissipation gap between upper yoke or lower yoke.
Claims (8)
1. high frequency transformer, including magnetic core, magnetic core includes the magnetic pole for wound around coil and the upper yoke positioned at magnetic pole upper and lower ends
With lower yoke, coil is wound in magnetic pole, the external casting solidification of coil has coil insulator, it is characterised in that: upper yoke and lower yoke
On be coated between insulating layer, coil insulator and upper yoke and/or lower yoke have heat dissipation gap.
2. high frequency transformer according to claim 1, it is characterised in that: the magnetic core is superimposed by least two nanocrystalline bands
It forms, insulating layer is poured before coil insulator is poured into coil and is solidificated on magnetic core.
3. high frequency transformer according to claim 1 or 2, it is characterised in that: the section of the magnetic core is rectangle, and magnetic pole has
Two, be wound with the coil in each magnetic pole, each magnetic pole coil includes primary coil and secondary coil, primary coil and
Insulating materials is provided between secondary coil.
4. high frequency transformer according to claim 1 or 2, it is characterised in that: the coil uses litz wire.
5. the manufacturing method of high frequency transformer includes the steps that the wound around coil in the magnetic pole of magnetic core, it is characterised in that: to magnetic
On column before wound around coil, insulating layer first is coated in the upper yoke of magnetic core and lower yoke, after coil is wrapped in magnetic pole, in coil
External molded coil insulator, there is between the coil insulator and upper yoke and/or lower yoke after casting heat dissipation gap.
6. the manufacturing method of high frequency transformer according to claim 5, it is characterised in that: use at least two nanocrystalline bands
Magnetic core is made in superposition bonding, then in the integrated poured layer insulating in the outside of magnetic core, is coated absolutely on upper yoke and lower yoke with reaching
The purpose of edge layer.
7. the manufacturing method of high frequency transformer according to claim 5 or 6, it is characterised in that: use section for rectangle
Magnetic core, when wound around coil, simultaneously wound primary coil and secondary coil in two magnetic poles of magnetic core, and in primary coil and
Insulating materials is set between secondary coil.
8. the manufacturing method of high frequency transformer according to claim 5 or 6, it is characterised in that: the coil uses Ritz
Line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811444573.8A CN109461563A (en) | 2018-11-29 | 2018-11-29 | A kind of high frequency transformer and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811444573.8A CN109461563A (en) | 2018-11-29 | 2018-11-29 | A kind of high frequency transformer and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109461563A true CN109461563A (en) | 2019-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811444573.8A Pending CN109461563A (en) | 2018-11-29 | 2018-11-29 | A kind of high frequency transformer and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109461563A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1516206A (en) * | 2003-08-25 | 2004-07-28 | 广州特种变压器厂有限公司 | Resin-poured insulation dry transformer and its production method |
| CN2742544Y (en) * | 2004-10-31 | 2005-11-23 | 许继集团有限公司 | Epoxy resin casted single phase dry transformer |
| CN201812641U (en) * | 2010-08-03 | 2011-04-27 | 秦皇岛敏锐新能源技术有限公司 | High-performance compact disc (CD) type magnetic core |
-
2018
- 2018-11-29 CN CN201811444573.8A patent/CN109461563A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1516206A (en) * | 2003-08-25 | 2004-07-28 | 广州特种变压器厂有限公司 | Resin-poured insulation dry transformer and its production method |
| CN2742544Y (en) * | 2004-10-31 | 2005-11-23 | 许继集团有限公司 | Epoxy resin casted single phase dry transformer |
| CN201812641U (en) * | 2010-08-03 | 2011-04-27 | 秦皇岛敏锐新能源技术有限公司 | High-performance compact disc (CD) type magnetic core |
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Application publication date: 20190312 |
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