阅读说明：本技术 内置冷板的高频变压器 (High-frequency transformer with built-in cold plate ) 是由 解鹏程 于海波 刘彬 汪涛 熊杰 张茂强 虞晓阳 骆仁松 黄樟坚 于 2021-06-28 设计创作，主要内容包括：本申请提供一种内置冷板的高频变压器,其特征在于,包括磁芯、初级绕组、次级绕组、冷板和绝缘外壳；其中,所述磁芯、所述初级绕组、所述次级绕组和所述冷板位于所述绝缘外壳内侧。本申请的高频变压器在散热性能、体积、绝缘性能之间取得更好的平衡。(The application provides a high-frequency transformer with a built-in cold plate, which is characterized by comprising a magnetic core, a primary winding, a secondary winding, a cold plate and an insulating shell; wherein the magnetic core, the primary winding, the secondary winding, and the cold plate are located inside the insulating housing. The high-frequency transformer obtains better balance between heat dispersion, volume, insulating properties.)

1. A high-frequency transformer with a built-in cold plate is characterized by comprising a magnetic core, a primary winding, a secondary winding, a cold plate and an insulating shell;

wherein the magnetic core, the primary winding, the secondary winding, and the cold plate are located inside the insulating housing.

2. The high frequency transformer according to claim 1, further comprising an insulating paste, wherein the magnetic core, the primary winding, the secondary winding and the cold plate are potted by the insulating paste to constitute a solid device.

3. The high frequency transformer according to claim 1, wherein said cold plate is proximate to or in direct contact with said magnetic core.

4. The high frequency transformer according to claim 1, wherein said cold plate is an internal hollow plate and has two ports, an inlet and an outlet, said inlet and said outlet being connected to external cooling terminals, respectively, by a pipe.

5. The high frequency transformer according to claim 4, wherein the interior of the cold plate is filled with a heat conducting medium which circulates with the same kind of heat conducting medium of the external cooling end through the pipes of the inlet and the outlet, respectively.

6. The high frequency transformer according to claim 5, wherein said circulation is performed by a form of flow and/or liquid-gas phase change.

7. The high-frequency transformer according to claim 2, wherein the material of the insulating paste is silicone rubber and/or epoxy resin.

8. The high frequency transformer according to claim 1, wherein the primary winding and the secondary winding are rectangular or circular in cross section.

9. The high-frequency transformer according to claim 1, wherein said magnetic core has a C-type structure or an E-type structure.

Technical Field

The application relates to the field of power electronic transformers, in particular to a high-frequency transformer with a built-in cold plate.

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 problem with this is that the heat exchanger is introduced and the overall transformer volume 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.

Therefore, there is a need for a high frequency transformer that achieves a better balance between heat dissipation performance, volume, and insulation performance.

In this background section, the above information disclosed is only for enhancement of understanding of the background of the application and therefore it may contain prior art information that does not constitute a part of the common general knowledge of a person skilled in the art.

Disclosure of Invention

The application aims to provide the high-frequency transformer with the built-in cold plate, and the high-frequency transformer can achieve better balance among heat dissipation performance, volume and insulation performance.

In order to achieve the above object, the present application provides a high frequency transformer with a built-in cold plate, which includes a magnetic core, a primary winding, a secondary winding, a cold plate and an insulating housing;

wherein the magnetic core, the primary winding, the secondary winding, and the cold plate are located inside the insulating housing.

According to some embodiments, the high frequency transformer further comprises an insulating glue, and the magnetic core, the primary winding, the secondary winding and the cold plate are encapsulated by the insulating glue to form a solid device

According to some embodiments, the cold plate is proximate to or in direct contact with the magnetic core.

According to some embodiments, the cold plate is an internal hollow plate and has two ports, an inlet and an outlet, which are connected to the external cooling end by a pipe, respectively.

According to some embodiments, the interior of the cold plate is filled with a heat conducting medium which circulates with the same type of heat conducting medium of the external cooling end through the conduits of the inlet and the outlet, respectively.

According to some embodiments, the circulation is performed by means of flow and/or liquid-gas phase change.

According to some embodiments, the material of the insulating glue is silicone rubber and/or epoxy resin.

According to some embodiments, the primary winding and the secondary winding are rectangular or circular in cross-section.

According to some embodiments, the magnetic core is of a C-type configuration or an E-type configuration.

According to some embodiments of the application, the heat in the high-frequency transformer is taken away through the circulation of the heat-conducting medium in the cold plate, so that the temperature rise of temperature-sensitive devices such as a magnetic core and a winding of the high-frequency transformer is remarkably reduced, and the service life and the safety are improved; under the condition of the same power consumption, the size of the high-frequency transformer can be favorably reduced, and the cost is reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 shows a schematic diagram of a high-frequency transformer according to an exemplary embodiment of the present application.

Fig. 2 shows a schematic structural diagram of a high-frequency transformer according to some embodiments of the present application after potting and molding of an insulating paste.

Fig. 3 is a schematic structural view of a high-frequency transformer according to another embodiment of the present application after removing an insulation case and an insulation paste.

Fig. 4 is a top view of fig. 3.

FIG. 5 illustrates a cut-away schematic view of a cold plate according to some embodiments of the present application.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.

The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other means, components, materials, devices, or the like. In such cases, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail.

The terms "primary," "secondary," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The application provides a high frequency transformer of built-in cold plate, gains better balance between heat dispersion, volume, insulating properties.

According to the technical concept of the application, the magnetic core and the winding are the components of the high-frequency transformer which generate heat greatly, the cold plate is close to or directly contacts the magnetic core or the secondary winding, and heat generated by the magnetic core, the secondary winding and the primary winding is transferred to the cavity shell of the cold plate in a heat transfer mode of heat conduction; the heat conducting medium in the cold plate takes away the heat of the cold plate cavity shell in a flowing or liquid-gas phase change or both forms; the heat-conducting medium in the cold plate is communicated with the heat-conducting medium at the external cooling end through pipelines at the inlet and the outlet of the cold plate to form circulation; when the high-frequency transformer works, the magnetic core and the winding continuously generate heat, and the heat conducting medium in the cold plate continuously takes away the heat through circulation; according to the high-frequency transformer, the heat in the high-frequency transformer is taken away through the circulation of the heat-conducting medium in the cold plate, so that the temperature rise of temperature-sensitive devices such as a magnetic core and a winding of the high-frequency transformer is remarkably reduced, the service life is prolonged, and the safety is improved; under the condition of the same power consumption, the size of the high-frequency transformer can be favorably reduced, and the cost is reduced.

A high frequency transformer according to an embodiment of the present application will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows a schematic diagram of a high-frequency transformer according to an exemplary embodiment of the present application.

Referring to fig. 1, the high frequency transformer of the exemplary embodiment includes a magnetic core 101, a primary winding 103, a secondary winding 105, a cold plate 107, and an insulating housing 109.

As shown in fig. 1, magnetic core 101, primary winding 103, secondary winding 105, and cold plate 107 are located inside an insulating housing 109.

According to an example embodiment, the cold plate 107 is proximate to the magnetic core 101 or in direct contact with the magnetic core 101.

Fig. 2 shows a schematic structural diagram of a high-frequency transformer according to some embodiments of the present application after potting and molding of an insulating paste.

Referring to fig. 2, the high frequency transformer of some embodiments includes an insulating paste 111, a magnetic core, a primary winding, a secondary winding, a cold plate, and an insulating case 109.

According to some embodiments, the magnetic core, the primary winding, the secondary winding, and the cold plate are potted by an insulating glue 111 to form a solid device, which is placed inside the insulating housing 109.

According to some embodiments, the material of the insulating gel 111 is silicone rubber and/or epoxy.

Fig. 3 is a schematic structural view of a high-frequency transformer according to another embodiment of the present application after removing an insulation case and an insulation paste. Fig. 4 is a top view of fig. 3.

Referring to fig. 3 and 4, a high frequency transformer of another embodiment includes a magnetic core 101, a primary winding 103, a secondary winding 105, a cold plate 107, and an insulating case 109.

As shown in FIG. 3, the cold plate 107 is an internal hollow plate and has two ports, an inlet 1071 and an outlet 1073, the inlet 1071 and the outlet 1073 being connected to external cooling ports (not shown) by pipes, respectively.

According to another embodiment, the interior of the cold plate 107 is filled with a heat transfer medium, and the heat transfer medium 1075 is circulated with the same heat transfer medium of the external cooling end through the pipes of the inlet 1071 and the outlet 1073, respectively.

According to another embodiment, the primary winding 103 and the secondary winding 105 are rectangular or circular in cross-section.

According to another embodiment, the magnetic core 101 is of a C-type configuration or an E-type configuration.

According to another embodiment, the piping of the inlet 1071 and the outlet 1073 is circulated with the same type of heat transfer medium of the external cooling end by means of flow and/or liquid-gas phase change.

FIG. 5 illustrates a cut-away schematic view of a cold plate according to some embodiments of the present application.

Referring to fig. 5, the cold plate of some embodiments has two ports, an inlet 1071 and an outlet 1073, each connected to an external cooling end by a pipe.

The embodiments of the present application have been described and illustrated in detail above. It should be clearly understood that this application describes how to make and use particular examples, but the application is not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.

Through the description of the example embodiments, those skilled in the art will readily appreciate that the technical solutions according to the embodiments of the present application have at least one or more of the following advantages.

According to the exemplary embodiment of the application, the magnetic core and the winding are large heat-generating components of the high-frequency transformer, the cold plate of the application is close to or directly contacts the magnetic core or the secondary winding, and heat generated by the magnetic core, the secondary winding and the primary winding is transferred to the cavity shell of the cold plate through heat transfer of heat conduction

According to some embodiments of the present application, the heat transfer medium inside the cold plate carries away heat from the cold plate cavity housing by flow or liquid-gas phase change or both; the heat-conducting medium in the cold plate is communicated with the heat-conducting medium at the external cooling end through pipelines at the inlet and the outlet of the cold plate to form circulation; when the high-frequency transformer works, the magnetic core and the winding continuously generate heat, and the heat conducting medium in the cold plate continuously takes away the heat through circulation;

according to some embodiments of the application, the heat in the high-frequency transformer is taken away through the circulation of the heat-conducting medium in the cold plate, so that the temperature rise of temperature-sensitive devices such as a magnetic core and a winding of the high-frequency transformer is remarkably reduced, and the service life and the safety are improved; under the condition of the same power consumption, the size of the high-frequency transformer can be favorably reduced, and the cost is reduced.

Exemplary embodiments of the present application are specifically illustrated and described above. It is to be understood that the application is not limited to the details of construction, arrangement, or method of implementation described herein; on the contrary, the intention is to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.