CN113077964A - Dry-type high-frequency transformer - Google Patents
Dry-type high-frequency transformer Download PDFInfo
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- CN113077964A CN113077964A CN202110253841.3A CN202110253841A CN113077964A CN 113077964 A CN113077964 A CN 113077964A CN 202110253841 A CN202110253841 A CN 202110253841A CN 113077964 A CN113077964 A CN 113077964A
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- frequency transformer
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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
- H01F27/08—Cooling; Ventilating
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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
- H01F27/02—Casings
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- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The invention discloses a dry-type high-frequency transformer, which comprises an insulating shell, a magnetic core, a winding and insulating glue, wherein the insulating shell is provided with a plurality of insulating holes; the magnetic core and the winding are arranged in the insulating shell, and a solid device is formed in an insulating glue filling and sealing mode; fins or fin structures are designed around the outside of the insulating shell. By adopting the technical scheme of the invention, under the condition of the same volume, the heat loss of the high-frequency transformer is more effectively transmitted to the external environment, the internal temperature rise of the magnetic core and the winding is reduced, the reliability is improved, and the service life of the transformer is prolonged.
Description
Technical Field
The invention belongs to the field of power electronic transformers, and particularly relates to a dry-type high-frequency transformer.
Background
In the field of power conversion of new energy direct current grid-connected systems, electric locomotive traction systems, power electronic transformers and the like, a high-power high-frequency transformer is a key component, and the overall efficiency and the power density of the transformer are greatly influenced. With the improvement of the performance of the switching devices, the successful application of novel switching devices, novel magnetic core materials and the like in power electronic devices, the frequency and power density of the power electronic devices are higher and higher.
The volume and the weight of the transformer can be reduced by improving the working frequency of the transformer, and the winding material and the manufacturing cost are saved, so that the transformer can be applied to application occasions with limited volume, space, weight and the like. In order to improve the power density and efficiency of the converter, a proper magnetic core material needs to be selected at the initial stage of transformer design, the transformer winding structure needs to be optimally designed, and the transformer loss is reduced.
In summary, on one hand, high power density devices require high frequency transformer devices to further reduce the size and improve the energy transmission efficiency, and on the other hand, the design scheme of high frequency transformation increases the magnetic core loss and the winding loss of high frequency transformation, which all put higher demands on the heat dissipation design of the high frequency transformer. Relevant enterprises at home and abroad research the situation. Patent application publication No. CN110853891A mentions that conventional epoxy casting is an improvement of high frequency transformers: namely, a first heat conduction pipe is pre-embedded in an epoxy-cast high-frequency transformer body, and then heat exchange is completed through an external heat exchanger. Through proper design, the method can improve the heat transfer efficiency and reduce the internal temperature rise; the problems brought by the introduction of heat exchangers are that the volume of the whole transformer is increased; the patent with publication number CN207977207U does not solve the heat dissipation problem of large capacity high frequency transformer, adopts the radiating metal casing of band ripple, fills the scheme of insulating oil in, brings other problems when solving the temperature rise problem: large volume, oil-containing, non-insulated shell, and non-compact arrangement of peripheral charged devices. It is particularly unsuitable for use in applications with higher power densities, such as Power Electronic Transformers (PET) and the like.
Disclosure of Invention
The invention aims to provide a dry-type high-frequency transformer, which can achieve better balance among heat dissipation performance, volume of the high-frequency transformer and insulation performance.
In order to achieve the above purpose, the solution of the invention is:
a dry-type high-frequency transformer, comprising: the winding comprises an insulating shell, a magnetic core, a winding and insulating glue; the magnetic core and the winding are arranged in the insulating shell, and the solid device is formed in the mode of insulating glue encapsulation. The fins or fin structures are arranged on the periphery of the outer portion of the insulating shell, so that the contact area of the insulating shell and external fluid is remarkably increased, and convection heat dissipation is enhanced.
In a preferable scheme, the insulating shell is made of an insulating material with high thermal conductivity coefficient, and the thermal conductivity coefficient is not lower than 5W/mK.
In a preferred embodiment, the insulating housing is made of a ceramic material or a heat-conducting composite material.
In the preferred scheme, the inner surface of the insulating shell is designed with a rib structure, so that the heat conduction efficiency between the shell and heating devices such as a magnetic core and a winding in the transformer is remarkably improved.
In a preferred scheme, the fin or fin structure on the outer surface of the insulating shell, the rib or rib structure on the inner surface and the insulating shell body form an integral structure or a split structure according to the requirement of a manufacturing process.
In the preferable scheme, the insulating glue has good heat conductivity, and the heat conductivity coefficient of the insulating glue is not lower than 2W/mK.
In a preferred scheme, the insulating glue is silicon rubber or epoxy resin.
In a preferred scheme, the winding is wound by litz wires. .
In a preferred embodiment, the winding has a rectangular or circular cross section.
In a preferred embodiment, the magnetic core has an E-type structure or a C-type structure.
The invention has the beneficial effects that: compared with the dry-type solid-state transformer composed of non-heat-conducting materials such as conventional epoxy resin (the heat conductivity coefficients of the epoxy resin transformer shell and the transformer pouring sealant are usually lower than 0.5W/mK), the high-heat-conductivity insulating glue enables the heat of heating devices such as a magnetic core and a winding in the high-frequency transformer to be more rapidly conducted to the shell; the high-heat-conduction insulating shell made of the ceramic material or the composite material enables heat inside the high-frequency transformer to be rapidly diffused and transferred to all parts and fins of the shell, and the fin structure increases the efficiency of heat convection with the outside. The invention reduces the thermal resistance from the high-frequency transformer heating device to the external environment in two aspects of internal conduction and external convection, and under the condition of the same volume, the invention can favorably reduce the temperature rise of temperature sensitive devices such as a magnetic core, a winding and the like of the high-frequency transformer, thereby prolonging the service life and improving the safety; under the condition of the same power consumption, the size of the high-frequency transformer is favorably reduced, and the cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a dry-type high-frequency transformer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dry-type high-frequency transformer according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of one structural component of a core and winding according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of another structural component of the magnetic core and winding of an embodiment of the present invention.
The parts in the figure are labeled as follows: 101-an insulating housing; 102-a magnetic core; 103-winding; 104-insulating glue; 105-insulating housing fins; 201-insulating case heat conducting rib plate; 301-a primary winding; 302-secondary winding.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows an embodiment of a dry-type high-frequency transformer according to the present invention, which includes: an insulating shell 101, a magnetic core 102, a winding 103 and insulating glue 104; the magnetic core 102 and the winding 103 are placed inside the insulating casing 101, and form a solid device in a manner of potting with an insulating glue 104. Fins or fin structures 105 are disposed around the outside of the insulating housing to significantly increase the contact area with the outside fluid and enhance convective heat dissipation.
As shown in fig. 2, in some embodiments, the inner surface of the insulating housing may further include a rib structure 201, which significantly increases the heat conduction efficiency between the heat generating devices such as the magnetic core and the winding inside the transformer and the housing.
In a preferred embodiment, the insulating shell is made of an insulating material with high thermal conductivity coefficient, and provides a packaging shell, a structural support and an external insulating support for other components of the high-frequency transformer, wherein the thermal conductivity coefficient of the insulating shell is not lower than 5W/mK. The insulating material includes, but is not limited to, a ceramic material or a thermally conductive composite material.
In a preferred embodiment, the fins or fin structures on the outer surface of the insulating shell, the ribs or rib structures on the inner surface and the insulating shell body can form an integral structure or a split structure according to the requirements of the manufacturing process.
In a preferred embodiment, the insulating adhesive is an insulating material with a high thermal conductivity coefficient, and has good thermal conductivity so as to achieve the performance of the high-frequency transformer described in the invention, and the thermal conductivity coefficient is not lower than 2W/mK. The high-thermal-conductivity insulating glue is made of (but not limited to) insulating materials such as silicon rubber, epoxy glue and the like, and the insulating property of the high-thermal-conductivity insulating glue meets the insulating property requirement of a high-frequency transformer with a corresponding voltage class.
The winding 103 is composed of a primary winding 301 and a secondary winding 302, as shown in fig. 3, the high-frequency transformer core 102 of the present dry type and a structural composition form of the primary winding 301 and the secondary winding 302, and the core 102 is of an E-shaped structure. Fig. 4 shows another structural configuration of the core 102 of the dry-type high-frequency transformer, the primary winding 301 and the secondary winding 302, and the core 102 is of a C-shaped structure.
In a preferred embodiment, the winding 103 is wound using litz wire. The winding cross-section may be rectangular or circular.
The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A dry-type high-frequency transformer, characterized in that: the transformer comprises an insulating shell, a magnetic core, a winding and insulating glue; the magnetic core and the winding are arranged in the insulating shell, and a solid device is formed in an insulating glue filling and sealing mode; fins or fin structures are arranged on the periphery of the outer portion of the insulating shell.
2. A dry type high frequency transformer as claimed in claim 1, wherein: the heat conductivity coefficient of the insulating shell is not lower than 5W/mK.
3. A dry type high frequency transformer as claimed in claim 2, wherein: the insulating shell is made of ceramic materials or heat-conducting composite materials.
4. A dry type high frequency transformer as claimed in claim 1, wherein: and a rib structure is arranged on the inner surface of the insulating shell.
5. A dry type high frequency transformer as claimed in claim 4, wherein: the fins or fin structures on the outer surface of the insulating shell, the ribs or rib structures on the inner surface and the insulating shell body form an integral structure or a split structure according to the requirements of the manufacturing process.
6. A dry type high frequency transformer as claimed in claim 1, wherein: the thermal conductivity coefficient of the insulating glue is not lower than 2W/mK.
7. A dry type high frequency transformer as claimed in claim 1, wherein: the insulating glue is silicon rubber or epoxy resin.
8. A dry type high frequency transformer as claimed in claim 1, wherein: the winding is wound by litz wires.
9. A dry type high frequency transformer as claimed in claim 1, wherein: the cross section of the winding is rectangular or circular.
10. A dry type high frequency transformer as claimed in claim 1, wherein: the magnetic core is of an E-type structure or a C-type structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110253841.3A CN113077964A (en) | 2021-03-03 | 2021-03-03 | Dry-type high-frequency transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110253841.3A CN113077964A (en) | 2021-03-03 | 2021-03-03 | Dry-type high-frequency transformer |
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| Publication Number | Publication Date |
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| CN113077964A true CN113077964A (en) | 2021-07-06 |
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| CN202110253841.3A Pending CN113077964A (en) | 2021-03-03 | 2021-03-03 | Dry-type high-frequency transformer |
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Citations (13)
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| CN101707117A (en) * | 2008-06-26 | 2010-05-12 | 苏州市万松电气有限公司 | Two-way cooling plate of power isolation transformer for train |
| CN201622910U (en) * | 2010-01-25 | 2010-11-03 | 广州金升阳科技有限公司 | Insulated shell used for annular magnetic core |
| CN204695903U (en) * | 2015-06-10 | 2015-10-07 | 谢利明 | High frequency transformer |
| CN205845642U (en) * | 2016-07-20 | 2016-12-28 | 深圳市港特科技有限公司 | There is the high-power transformer of high-efficiency heat radiation structure |
| CN206134420U (en) * | 2016-11-11 | 2017-04-26 | 四川英杰电气股份有限公司 | High -frequency transformer and high frequency electric source |
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| CN206649973U (en) * | 2017-01-19 | 2017-11-17 | 河北鑫环通变压器制造有限公司 | New fugitive heat transformer |
| CN207718998U (en) * | 2018-01-23 | 2018-08-10 | 温州篮箭环保科技有限公司 | High-frequency and high-voltage power supply heat-dissipating voltage transformer |
| CN209118872U (en) * | 2018-11-23 | 2019-07-16 | 深圳市益宏电子科技有限公司 | Convenient for the power transformer of heat dissipation |
| CN209281983U (en) * | 2019-01-08 | 2019-08-20 | 杨旭 | A kind of novel high-frequency transformer |
| CN110299242A (en) * | 2019-07-05 | 2019-10-01 | 南京理工大学 | A kind of single-phase dry type high frequency transformer |
| CN209471797U (en) * | 2018-11-23 | 2019-10-08 | 深圳古瑞瓦特新能源股份有限公司 | Shell structure for preventing pouring sealant from falling off |
| CN212182098U (en) * | 2020-06-09 | 2020-12-18 | 连云港明昊电子有限公司 | Flat electronic transformer |
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2021
- 2021-03-03 CN CN202110253841.3A patent/CN113077964A/en active Pending
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| CN101707117A (en) * | 2008-06-26 | 2010-05-12 | 苏州市万松电气有限公司 | Two-way cooling plate of power isolation transformer for train |
| CN201622910U (en) * | 2010-01-25 | 2010-11-03 | 广州金升阳科技有限公司 | Insulated shell used for annular magnetic core |
| CN204695903U (en) * | 2015-06-10 | 2015-10-07 | 谢利明 | High frequency transformer |
| CN205845642U (en) * | 2016-07-20 | 2016-12-28 | 深圳市港特科技有限公司 | There is the high-power transformer of high-efficiency heat radiation structure |
| CN206134420U (en) * | 2016-11-11 | 2017-04-26 | 四川英杰电气股份有限公司 | High -frequency transformer and high frequency electric source |
| CN206349226U (en) * | 2016-11-21 | 2017-07-21 | 姚孟德 | One kind energy-conservation high frequency security transformer |
| CN206649973U (en) * | 2017-01-19 | 2017-11-17 | 河北鑫环通变压器制造有限公司 | New fugitive heat transformer |
| CN207718998U (en) * | 2018-01-23 | 2018-08-10 | 温州篮箭环保科技有限公司 | High-frequency and high-voltage power supply heat-dissipating voltage transformer |
| CN209118872U (en) * | 2018-11-23 | 2019-07-16 | 深圳市益宏电子科技有限公司 | Convenient for the power transformer of heat dissipation |
| CN209471797U (en) * | 2018-11-23 | 2019-10-08 | 深圳古瑞瓦特新能源股份有限公司 | Shell structure for preventing pouring sealant from falling off |
| CN209281983U (en) * | 2019-01-08 | 2019-08-20 | 杨旭 | A kind of novel high-frequency transformer |
| CN110299242A (en) * | 2019-07-05 | 2019-10-01 | 南京理工大学 | A kind of single-phase dry type high frequency transformer |
| CN212182098U (en) * | 2020-06-09 | 2020-12-18 | 连云港明昊电子有限公司 | Flat electronic transformer |
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Application publication date: 20210706 |