INSULATION STRUCTURE AND ELECTRONIC DEVICE

The present application provides an insulation structure and an electronic device, where the insulation structure includes a first substrate, a first conductive body, and a first groove, the first substrate includes a first surface and a second surface oppositely disposed; the first conductive body is disposed on the first surface or second surface; the first groove is located on a same surface as the first conductive body and adjacent to the first conductive body; a surface of the first groove is provided with a first conductive layer, and the first conductive layer is electrically connected with the first conductive body. The insulation structure of the present application slows down the trend of potential line changes at the end of the first conductive body, reduces the electric field strength here, and improves the reliability of insulation.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202310982995.5, filed on Aug. 4, 2023 and entitled “INSULATION STRUCTURE AND ELECTRONIC DEVICE”, which is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present application relates to the field of electrical equipment technology and, in particular, to an insulation structure and an electronic device.

BACKGROUND

In recent years, with the increasing progress of electronic industry technology, various electronic devices have developed rapidly towards small size, lightweight, modular, and high-voltage directions. With the rapid development of electronic devices, there are also various problems. For example, in an energy storage system with a voltage level of 1500V and higher, the reliability of a medium voltage auxiliary power supply gradually decreases as a voltage level increases. The reason for the above problem is that an insulation structure of some electronic devices in the medium voltage auxiliary power supply is prone to partial discharge and accelerated aging. Specifically, the insulation structure in related arts generally includes a substrate and a conductive body disposed on the substrate, but the inventor discovered that an edge tip of the conductive body near the substrate is prone to severe electric field distortion, leading to partial discharge or even insulation breakdown, accelerating the aging of the insulation structure, and seriously affecting the service life of the insulation structure.

SUMMARY

In order to overcome the aforementioned defects in the related arts, the purpose of the present application is to provide an insulation structure and an electronic device. The present application can improve the problem of electric field distortion at the end of the insulation structure, reduce the probability of partial discharge, delay the insulation aging process, and is conducive to improving the service life of the insulation structure.

In a first aspect, the present application provides an insulation structure, including:a first substrate, where the first substrate includes a first surface and a second surface oppositely disposed;a first conductive body, where the first conductive body is disposed on the first surface or the second surface;a first groove, where the first groove is located on a same surface as the first conductive body and adjacent to the first conductive body;where a surface of the first groove is provided with a first conductive layer, and the first conductive layer is electrically connected with the first conductive body.

In another aspect, the present application provides an electronic device including an insulation structure, the insulation structure includes:a first substrate, where the first substrate includes a first surface and a second surface oppositely disposed;a first conductive body, where the first conductive body is disposed on the first surface or the second surface;a first groove, where the first groove is located on a same surface as the first conductive body and adjacent to the first conductive body;where a surface of the first groove is provided with a first conductive layer, and the first conductive layer is electrically connected with the first conductive body.

The present application provides an insulation structure and an electronic device, where the insulation structure includes a first substrate, a first conductive body, and a first groove, the first substrate includes a first surface and a second surface oppositely disposed; the first conductive body is disposed on the first surface or second surface; the first groove is located on a same surface as the first conductive body and adjacent to the first conductive body; a surface of the first groove is provided with a first conductive layer, and the first conductive layer is electrically connected with the first conductive body. The insulation structure of the present application utilizes the first conductive layer electrically connected with the first conductive body to transfer the “three-phase point” where an electric field strength is concentrated in an intersection area of the first conductive body, the first substrate, and the insulation medium to the end of the first groove away from the first conductive body; at the same time, an equivalent thickness of the end of the first conductive body is increased, which slows down the trend of potential line changes at the end of the first conductive body, reduces the electric field strength here, improves the electric field distortion problem of the end of the first conductive body of the insulation structure, and improves the reliability of insulation. From the above description, the present application can improve the problem of electric field distortion at the end of the insulation structure, reduce the probability of partial discharge, delay the insulation aging process, and is conducive to improving the service life of the insulation structure.

REFERENCE NUMERALS

DETAILED DESCRIPTION OF EMBODIMENTS

Firstly, it should be noted that in the description of embodiments, a first direction X and a second direction Y are two mutually perpendicular directions in a plane. Among them, the first direction X may be a vertical direction for example, and the second direction Y may be a horizontal direction for example.

FIG.1is a schematic diagram of an insulation structure in the related art. Please refer toFIG.1, the insulation structure in the related art includes a substrate10and a conductive body20disposed on the substrate10. In a plane parallel to a first direction X and a second direction Y, a projection shape of the conductive body20is generally trapezoidal. Due to a relatively thin thickness (usually only a few tens of microns thick) at edge tips of the conductive body20near a side of the first substrate (A and B inFIG.1), the change of equipotential line is relatively quickly and an electric field strength is relatively concentrated; at the same time, this is also a “three-phase point” area where the three materials of “conductive body-substrate-insulation medium” intersect, further exacerbating a local electric field distortion in this area, which is prone to partial discharge and even leading to insulation breakdown, accelerating the aging of the insulation structure, and seriously affecting the service life of the insulation structure.

In order to alleviate the above problems, the related arts have also provided several improved insulation structures.

FIG.2is a structural diagram of another insulation structure in the related art. As shown inFIG.2, the insulation structure is welded with a round conductor30on the basis of the insulation structure shown inFIG.1. Specifically, the round conductor30is welded to a surface of the conductive body20on the side away from the substrate10. This insulation structure may alleviate the phenomenon of electric field distortion at the edge tip of the conductive body20at some extent. However, it requires high welding accuracy for the round conductor30, and improper welding position of the round conductor30may affect the electric field control effect at the edge tip of the conductive body20. In addition, this scheme also increases the volume of the insulation structure.

FIG.3is a structural diagram of yet another insulation structure in the related art. As shown inFIG.3, the insulation structure introduces a strip conductor40on the basis of the insulation structure shown inFIG.1. Specifically, the strip conductor40is welded to a surface of the conductive body20on the side away from the substrate10. This insulation structure may also alleviate the phenomenon of electric field distortion at the edge tip of the conductive body20at some extent. However, after the introduction of the strip conductor40, a new tip will be formed at the end of the strip conductor40, which will also cause the electric field distortion and affect the service life of the insulation structure. In order to improve the electric field at the edge tip of the conductive body20, it is required that the thickness of the strip conductor40is thick enough, which will increase the volume of the insulation structure.

FIG.4is a structural diagram of yet another insulation structure in the related art. As shown inFIG.4, a thickness of the conductive body20of the insulation structure has been directly increased on the basis of the insulation structure shown inFIG.1. The insulation structure has a poor effect on improving the electric field distortion at the edge tip of the conductive body20(such as increasing the thickness of the conductive body20from 1 oz to 6 oz, but only reducing the electric field at the end by 13%). At the same time, the process is relatively complex and the implementation cost is high in a specific implementation.

In view of this, some embodiments of the present application aim to provide an insulation structure and an electronic device, by setting a groove and a conductive layer on an inner surface of the groove, an end of the conductive body is electrically connected with the conductive layer, thereby transferring a “three-phase point” where an electric field strength is concentrated in an intersection area of the three materials of “conductive body-substrate-insulation medium” to one end of the conductive layer away from the conductive body; at the same time, it also increases an equivalent thickness of the end of the conductive body, and the change of the equipotential line is relatively smooth, thereby reducing the electric field strength here, improving the electric field distortion problem of the end of the conductive body of the insulation structure, and improving the reliability of insulation. In addition, the insulation structure of some embodiments will not result in an increase in volume.

In order to make the purpose, technical solution, and advantage of the embodiments of the present application clearer, the following will provide a clear and complete description of the technical solution in the embodiments of the present application in conjunction with the figures. Apparently, the described description are some embodiments of the present application rather than all embodiments of the present application.

On the basis of the embodiments in the present application, all other embodiments obtained by the persons of ordinary skill in the art without creative labor fall within the scope of protection in the present application. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

FIG.5is a structural diagram of an insulation structure provided in some embodiments of the present application.

Please refer toFIG.5, it provides an insulation structure, including:a first substrate100, where the first substrate100includes a first surface101and a second surface102oppositely disposed;at least one first conductive body200, where the first conductive body200is disposed on the first surface101or the second surface102; it means that the first conductive body200can only disposed on one of the first surface101and the second surface102, and the first conductive body200can also disposed on the first surface101and the second surface102at the same time;at least one first groove110, where the first groove110is located on a same surface as the at least one first conductive body200and adjacent to the first conductive body200;where the surface of the first groove110is provided with a first conductive layer300, and the first conductive layer300is electrically connected with the first conductive body200. In some embodiments, the first conductive layer300is a metal layer or a semi-conductive layer.

In some embodiments, the first substrate100is a solid-state insulation board, which may be a printed circuit board or a ceramic board. The first substrate100includes the first surface101and the second surface102oppositely disposed along a first direction X, and the first conductive body200and the first groove110may both be disposed on the first surface101; where the first groove110may be disposed on both sides of the first conductive body200along the second direction Y. The first conductive layer300may be formed in the first groove110by a deposition manner; and the first conductive layer300may be a metal layer or a semi-conductive layer. In some embodiments, the first conductive body200may be a copper foil with a thickness less than 1 mm, such as, copper foils of 35 μm, 70 μm, and other thicknesses used in typical printed circuit boards. The end of the first conductive layer300is electrically connected with the first conductive body200. Specifically, the first conductive layer300may be directly connected with the first conductive body200or indirectly connected through an intermediate medium, such as welding.

In some embodiments, first grooves110are disposed at both ends of the first conductive body200, and the end of the first conductive body200is electrically connected with the first conductive layer300within the first groove110, thereby transferring the “three-phase point” (at C and D inFIG.5) where an electric field strength is concentrated in an intersection area of the first conductive body200, the first substrate100, and the insulation medium to the end of the first groove110away from the first conductive body200(at E and F inFIG.5). At the same time, an equivalent thickness of the end of the first conductive body200is increased, which slows down the trend of potential line changes at the end of the first conductive layer300, reduces the electric field strength here, improves the electric field distortion problem at the end of the first conductive body200of the insulation structure, and improves the reliability of insulation.

From the above description, the insulation structure inFIG.5can improve the problem of electric field distortion at the end of the insulation structure, reduce the probability of partial discharge, delay the insulation aging process, and is conducive to improving the service life of the insulation structure. Moreover, the above scheme will not increase the volume of the insulation structure.

In the structure shown inFIG.5, a position of the first groove110is exactly coincided with the first conductive body200, hence the first conductive layer300within the first groove110may be directly connected with the first conductive body200. This structure requires high process accuracy.

In some other embodiments, the first groove110is separated from the first conductive body200by a preset distance. That is to say, the first groove110is not directly connected with the first conductive body200, and at this time, the first conductive layer300is electrically connected with the first conductive body200through an intermediate medium. This structure can ensure good end electric field improvement while reducing process difficulty and avoiding damage to the first conductive body200during the machining process of the first groove110.

FIG.6is a structural diagram of an insulation structure provided in some embodiments of the present application. Please refer toFIG.6, the first substrate100is further provided with a first connecting layer400, and the first conductive body200is connected with the first conductive layer300through the first connecting layer400.

In some embodiments, the first connecting layers400are disposed on both sides of the first conductive body200along the second direction Y, in order to connect with the first conductive layer300on both sides. The first connecting layer400may be connected with the first conductive body200and the first conductive layer300by welding, in order to achieve electrical connection between the first conductive body200and the first conductive layer300. The first connecting layer400may be a conductive metal layer (such as, a copper layer or an aluminum layer) or a semi-conductive layer.

In some embodiments, the first connecting layer400may also be a part of the first conductive layer300; that is to say, the first connecting layer400and the first conductive layer300are integrally formed. Among them, the first conductive layer300is electrically connected with the first conductive body200after extending beyond the first groove110.

In some embodiments, the preset distance mentioned above may range from 0 mm to 0.3 mm; that is to say, a length of the first connecting layer400in the second direction Y ranges from 0 mm to 0.3 mm. This preset distance can not only reduce the machining difficulty of the first groove110, protect the first conductive body200from accidental damage, but also ensure the improvement effect of the first groove110on the electric field at the edge tip of the first conductive body200.

FIG.7is a structural diagram of an insulation structure provided in some embodiments of the present application. Please refer toFIG.7, the insulation structure further includes a second conductive body500and a second groove120, where the first conductive body200, the first groove110, the second conductive body500, and the second groove120are all located on a same surface, and the second groove120is adjacent to the second conductive body500.

A surface of the second groove120is provided with a second conductive layer600, and the second conductive layer600is electrically connected with the second conductive body500. A potential of the first conductive body200is different from a potential of the second conductive body500.

In some embodiments, the second conductive body500and the second conductive layer600may also be connected through a connecting layer (not shown in the figure), which may be a conductive metal layer (such as a copper layer or an aluminum layer) or a semi-conductive layer. In some embodiments, the connecting layer may also be a part of the second conductive layer600; that is to say, the connecting layer and the second conductive layer600are integrally formed. Among them, the second conductive layer600and a second connecting layer may be a conductive metal layer (such as a copper layers, an aluminum layers, etc.) or a semi-conductive layer.

In some embodiments, the first conductive body200, the first groove110, the second conductive body500, and the second groove120may all be disposed on the first surface101; where the first groove110may be disposed on both sides of the first conductive body200along the second direction Y, and the second groove120may be disposed on both sides of the second conductive body500along the second direction Y. The first conductive layer300and the second conductive layer600may both be metal layers or semi-conductive layers. The first conductive layer300and the second conductive layer600may both be formed in corresponding grooves by a deposition manner. An end of the first conductive layer300is electrically connected with the first conductive body200, and an end of the second conductive layer600is electrically connected with the second conductive body500; which may be directly connected or indirectly connected through an intermediate medium; and the specific connection method may be welding, etc.

Due to the difference in potential between the first conductive body200and the second conductive body500, the above structure can reduce the high electric field strength at the ends of the conductive bodies of the first conductive body200and the second conductive body500.

FIG.8is a structural diagram of an insulation structure provided in some embodiments of the present application. Please refer toFIG.8, the insulation structure further includes a second conductive body500, where the second conductive body500is adjacent to the first substrate100, and a potential of the first conductive body200is different from a potential of the second conductive body500.

In some embodiments, the second conductive body500may be a magnetic core in a magnetic component, and a dashed line represents an axis of symmetry for the second conductive body500. The second conductive body500is adjacent to the first substrate100along the second direction Y, that is to say, there is a gap between the second conductive body500and the first conductive body200disposed on the first substrate100. Due to the difference in potential between the first conductive body200and the second conductive body500, the first grooves110are disposed on both sides of the first conductive body200along the second direction Y, and the first conductive layer300is disposed within the first groove110, which can reduce the high electric field strength of the end of the first conductive body200towards the second conductive body500.

FIG.9is a structural diagram of an insulation structure provided in some embodiments of the present application. Please refer toFIG.9, the insulation structure further includes a second conductive body500and a second groove120, where the first conductive body200and the first groove110are disposed on the first surface101, the second conductive body500and the second groove120are disposed on the second surface102, and the second groove120is adjacent to the second conductive body500.

A surface of the second groove120is provided with a second conductive layer600, the second conductive layer600is electrically connected with the second conductive body500; and a potential of the first conductive body200is different from a potential of the second conductive body500.

In some embodiments, there are multiple electrically connected first conductive bodies200and multiple electrically connected second conductive bodies500disposed on the first surface101and second surface102of the first substrate100, respectively. Specifically, the first conductive bodies200and the first grooves110may be disposed on the first surface101; and the first grooves110are located on the outer side of the outermost first conductive body200in the second direction Y. The second conductive bodies500and the second grooves120can both be arranged on the second surface102, and in the second direction Y, the second grooves120are located on an outer side of the outermost second conductive body500. The arrangement of the first conductive layers300and the second conductive layers600within their respective grooves are the same as described in the above embodiments, which will not be repeated here.

In some embodiments, there may be multiple first conductive bodies200and multiple second conductive bodies500. When the multiple first conductive bodies200are connected in parallel, due to the same potential between the multiple first conductive bodies200, the first grooves110may only be adjacent to an outer side of the outermost first conductive body200. When the multiple second conductive bodies500are connected in parallel, the second grooves120may only be adjacent to an outer side of the outermost second conductive body500. In other embodiments of the present application, when the multiple first conductive bodies200are connected in series, first grooves110may be disposed on both sides of each first conductive body200along the second direction Y, or when the multiple second conductive bodies500are connected in series, second grooves120may be disposed on both sides of each second conductive body500.

In some embodiments, due to the difference in potential between the first conductive body200and the second conductive body500, the first groove110is disposed on the outer side of the first conductive body200and the first conductive layer300is disposed within the first groove110, which may reduce the high electric field strength at the end of the first conductive body200; and the second groove120is disposed on the outer side of the second conductive body500and the second conductive layer600is disposed within the second groove120, which may reduce the high electric field strength at the end of the second conductive body500.

FIG.10is a structural diagram of an insulation structure provided in some embodiments of the present application. Please refer toFIG.10, the insulation structure further includes a heat sink1000, and the heat sink1000is disposed on the second surface102.

In some embodiments, the first surface101of the first substrate100is provided with multiple first conductive bodies200, the multiple first conductive bodies200are spaced apart from each other along the second direction Y, and each first conductive body200may be connected with a power device2000, specifically connected to a back plate or a PIN of the power device2000. In some embodiments, potentials of the multiple first conductive bodies200may be different from each other, and each first conductive body200is provided with first grooves110on both sides. Each of the first groove110is provided with a first conductive layer300electrically connected to the corresponding first conductive body200. The heat sink1000is disposed on the second surface102and electrically connected with the second conductive body500. A potential of the first conductive body200located on the first surface101is different from a potential of the second conductive body500located on the second surface102.

It can be understood that when a part of the first conductive bodies200in the multiple first conductive bodies200are connected in parallel, the potentials of the parallel connected part of the first conductive body200is the same with each other. At this time, the first groove110and the first conductive layer300only need to be disposed outside the outermost first conductive body200in the parallel connected part of the first conductive bodies200.

In some embodiments, the first groove110is disposed on the outer side of the first conductive body200, and the first conductive layer300is disposed within the first groove110, which may reduce the high electric field strength of the end of the first conductive body200and the end of the second conductive body500. Due to the different potentials of different first conductive bodies200, the first grooves110are disposed on both sides of each first conductive body200, and the first conductive layers300are disposed within the corresponding first grooves110, which may reduce the high electric field strength at the ends of adjacent first conductive bodies200; the second groove120is disposed on the outer side of the second conductive body500and a second conductive layer600is disposed within the second groove120, which may reduce the high electric field strength at the end of the second conductive body500.

FIG.11is a structural diagram of an insulation structure provided in some embodiments of the present application. Please refer toFIG.11, a difference between the embodiments shown inFIG.11andFIG.10is that, the projection of the first conductive body200on the first surface101is inside of the projection of the second conductive body500or the heat sink1000on the first surface101. At this time, in the first direction X, the end of first conductive body200and the end of second conductive body500are not directly opposite, so it is not necessary to dispose a metallized groove structure on both sides of the second conductive body500.

FIG.12is a structural diagram of an insulation structure provided in some embodiments of the present application. Please refer toFIG.12, which differs from the embodiments shown inFIG.11is that it only shows the case of including a single first conductive body200.

FIG.13is a structural diagram of an insulation structure provided in some embodiments of the present application. Please refer toFIG.13. In some embodiments, the insulation structure further includes:a second substrate700, where the second substrate700includes a third surface701and a fourth surface702oppositely disposed;at least one second conductive body500, where the second conductive body500is disposed on the third surface701or the fourth surface702; it is means that the second conductive body500can only disposed on one of the third surface701and the fourth surface702, and the second conductive body500can also disposed on both of the third surface701and the fourth surface702at the same time;at least one second groove120, where the second groove120is located on a same surface as the at least one second conductive body500and adjacent to the second conductive body500;where a potential of the first conductive body200is different from a potential of the second conductive body500. A surface of the second groove120is provided with a second conductive layer600, and the second conductive layer600is electrically connected with the second conductive body500. Among them, the second conductive layer600may be example, a metal layer or a semi-conductive layer.

In some embodiments, there are two planar winding structures in a planar magnetic component. Both The first substrate100and the second substrate700can be solid-state insulation boards, which may be printed circuit boards or ceramic boards. The second surface102of the first substrate100may be provided with multiple first conductive bodies200connected in series to form a first winding, the first grooves110may be disposed on both sides of the outermost first conductive body200along the second direction Y, and the first groove110is provided with the first conductive layer300electrically connected to the first conductive body200. The third surface701of the second substrate700may be provided with multiple second conductive bodies500connected in series to form a second winding, the second grooves120may be disposed on both sides of the outermost second conductive body500along the second direction Y, and the second groove120is provided with the second conductive layer600electrically connected to the second conductive body500.

Through the above structure, it can reduce the high electric field strength at the end of the first conductive body200and the end of the second conductive body500.

Furthermore, the second substrate700is further provided with a second connecting layer (not shown in the figure), and the second conductive body500is connected to the second conductive layer600through the second connecting layer.

In some embodiments, the second connecting layer is disposed on both sides of the second conductive body500along the second direction Y, to connect the second conductive layer600on both sides. The second connecting layer may be connected with the second conductive body500and the second conductive layer600by welding, to achieve the electrical connection between the second conductive body500and the second conductive layer600. The second connecting layer may be a conductive metal layer (such as a copper layer or an aluminum layer) or a semi-conductive layer.

In some other embodiments, the second connecting layer is a part of the second conductive layer600; that is to say, the second connecting layer and the second conductive layer600are integrally formed. Among them, the second conductive layer600is electrically connected with the second conductive body500after extending beyond the second groove120.

FIG.14is a structural diagram of a first substrate provided in some embodiments of the present application. Please continue to refer toFIG.5andFIG.14, the first conductive body200and the first groove110are disposed on the first surface101, and the first groove110includes two side walls111and a bottom wall112.

In some embodiments, the first groove110includes two side walls111parallel to the first direction X and a bottom wall112parallel to the second direction Y. The side walls111are perpendicular to the bottom wall112, and a projection of the first groove110in a plane parallel to a plane formed by the first direction X and the second direction Y is in the form of a square with an opening on one side.

The setting of the first groove110improves the electric field distortion problem at the edge tip of the first conductive body200, however, the first conductive layer300at both ends of the side wall111of the first groove110is a new electric field concentration area (referring to the area E inFIG.5). In order to further enhance the reliability of insulation of the product, it is necessary to improve and handle the electric field concentration problem of these two new ends.

FIG.15is a structural diagram of a first substrate provided in some embodiments of the present application. Please refer toFIG.15, the side wall111and bottom wall112are connected through an arc transition segment113.

Compared to the embodiments shown inFIG.14, the embodiments shown inFIG.15are beneficial for improving the electric field concentration problem of the first conductive layer300at the connection between the side walls111and the bottom wall112, further reducing the probability of partial discharge and improving the reliability of the insulation structure.

FIG.16is a structural diagram of a first substrate provided in some embodiments of the present application. Please refer toFIG.16, in some embodiments, within a cross-section perpendicular to the first substrate100, the bottom wall112and the side walls111on both sides of the bottom wall112jointly form an arc shape.

Compared to the embodiments shown inFIG.15, the embodiments shown inFIG.16conducive to further improving the electric field concentration problem of the first conductive layer300at the connection between the side walls111and the bottom wall112, making the electric field distribution at the end of the first conductive layer300more uniform, and further improving the reliability of the insulation structure.

In the above embodiments, the first conductive layer300located on the side wall111and the first conductive layer300located on the bottom wall112have the same thickness.

It should be noted that, the structure of the second groove120may also adopt any of the aforementioned structures of the first groove110.

FIG.17is a structural diagram of an insulation structure provided in some embodiments of the present application;FIG.18is a structural diagram of an insulation structure provided in some embodiments of the present application; andFIG.19is a structural diagram of an insulation structure provided in some embodiments of the present application. Please refer toFIG.17-FIG.19, a shielding structure is provided in the first groove110to improve electric field of the end of the first conductive layer300at the end of the side walls111of the first groove110away from the bottom wall112.

In some embodiments, as shown inFIG.17, the shielding structure is a wire810, where the wire810is connected with the first conductive layer300at a side wall111away from the first conductive body200.

In some embodiments, the wire810may be a copper wire, or an aluminum wire, and etc.; the wire810is disposed at one end away from the first conductive body200in the second direction Y and connected with the side wall111of the first groove110. Furthermore, a side of wire810away from the bottom wall112is higher than the first surface101to achieve better electric field improvement effect.

Through the above structure, an equivalent width of the first conductive layer300on the side away from the first conductive body200can be increased, so that the change of equipotential line of the first conductive layer300at the end of the side wall111on the side away from the first conductive body200in the second direction Y is relatively smooth, thereby avoiding electric field strength concentration, reducing the probability of partial discharge, and delaying the insulation aging process, which is conducive to improving the service life of the insulation structure.

In some embodiments, as shown inFIG.18, the shielding structure is a conductive protrusion820, where the conductive protrusion820is located on the first conductive layer300on a surface of the bottom wall112.

In some embodiments, the conductive protrusion820may be located in the middle of the bottom wall112in the second direction Y; and a material of the conductive protrusion820may be the same as a material of the first conductive layer300. The conductive protrusion820may be formed on the first conductive layer300by a manner of deposition. Furthermore, the conductive protrusion820extends in a direction away from the bottom wall112, and a side of the conductive protrusion820away from the bottom wall112is higher than the first surface101, thereby providing a better high electric field strength shielding effect.

Through the above structure, it can optimize the electric field strength distribution within the first conductive layer300, make the change of equipotential line of the first conductive layer300at the end of the side wall111away from the first conductive body200more smooth, avoiding electric field strength concentration, further reducing the probability of partial discharge, delaying the insulation aging process, and improving the service life of the insulation structure.

In some embodiments, as shown inFIG.19, the shielding structure is a conductive shielding cover830, where the conductive shielding cover830includes a main body831and a bending part832. The main body831is disposed parallel to the first surface101and covers an opening of the first groove110partly. A first end of the main body831is electrically connected with the first conductive body200or the first conductive layer300, and a second end of the main body831is connected with the bending part832, where the bending part832is bent towards the first groove110.

In some embodiments, the conductive shielding cover830may be made of a material, such as, copper and aluminum sheets that are bent; the main body831is disposed along the second direction Y and covers the opening of the first groove110partly, and the main body831electrically connects the bending part832with the first conductive body200or the first conductive layer300.

Through the above structure, it can improve the electric field strength distribution within the first conductive layer300, further smoothening the change of equipotential line of the first conductive layer300at the end of the side wall111away from the first conductive body200, avoiding electric field strength concentration, further reducing the probability of partial discharge, delaying the insulation aging process, and is conducive to improving the service life of the insulation structure.

Furthermore, in some embodiments, the main body831is disposed higher than the first surface101, thereby achieving better high electric field strength shielding effect.

In some embodiments, the insulation structure further includes an insulation medium, where the insulation medium wraps around the insulation structure.

In some embodiments, the insulation medium may be a gas material, such as, air and inert gases, which is suitable for a product with a lower voltage level and a lower requirement for insulation and safety regulation; may also be a solid material, such as, an encapsulating adhesive with better insulation performance, and a fully encapsulated structure can be constructed using encapsulating adhesive to block a creepage path, which is suitable for a product with a higher requirement for voltage level and power density.

In some embodiments, the insulation structure further provides an electronic device, including the insulation structure in any one of the above embodiments.

Specifically, the electronic device includes any one of transformer, inductor, PCB-based busbar, and power device packaging module.

FIG.20is a structural diagram of an electronic device provided in some embodiments of the present application; whereFIG.7shows a cross-sectional view of A-A section ofFIG.20. In some embodiments, when the insulation structure is applied to a magnetic component, the insulation structure may be a planar transformer, with the first conductor200being a spiral structure winding (such as a primary winding), with at least one turn. The second conductor500may be another winding (such as a secondary winding) in the magnetic component, and this insulation structure may be used to reduce the high electric field strength at the end of the two windings.

In some embodiments, the above magnetic component may include a magnetic core (as shown inFIG.8) or do not include a magnetic core (as shown inFIG.9andFIG.13). The electronic device may be a transformers or an inductor.

In some embodiments, as shown inFIG.8, the second conductive body500may be a magnetic core, and the insulation structure may be used to reduce the high electric field strength of the end of the conductive layer of the winding to the magnetic core.

In some embodiments, the first conductive body200and the second conductive body500may be located on different insulation substrates (as shown inFIG.13); may also be located on both surfaces of a same insulation substrate (as shown inFIG.9); may also be located in different layers of a same insulation substrate.

In some embodiments, when the insulation structure is applied to a PCB-based busbar, the first conductive body200and the second conductive body500may be conductive bodies connected to different potential points in a circuit system, such as, the first conductive body200connected to a positive pole of the circuit system and the second conductive body500connected to a negative pole of the circuit system. In some embodiments, a number of conductive bodies with different potential located on each surface of the insulation substrate is not limited, nor is a number of conductive bodies with same potential located on each surface of the insulation substrate.

In some embodiments, as shown inFIG.7, the first conductive body200and the second conductive body500may be located on a same surface of the insulation substrate. The insulation structure is more suitable for a situation where a potential difference between the first conductive body200and the second conductive body500is small, i.e. when the requirement for insulation is relatively low.

In some embodiments, the first conductive body200and the second conductive body500may also be located on opposite surfaces of the insulation substrate. The insulation structure is more suitable when a potential difference between the first conductive body200and the second conductive body500is relatively large, i.e. when the requirement for insulation is relatively high. The two conductive bodies are located on opposite surfaces, which can fully utilize the insulation capacity of the insulation substrate, and avoid the problem of excessive busbar size caused by high requirement for insulation safety distance when the first conductive body200and the second conductive body500are located on the same side.

In addition, the first conductive body200and the second conductive body500may also be located on different layers of the insulation substrate, such as, integrating more than two potentials in a PCB-based busbar.

In some embodiments, when the insulation structure is applied to a power device packaging module, the first conductive body200is used for installation of the power device, which is connected to a metal back plate or a pin of the power device. The second conductive body500may be connected to a heat sink1000on the other side of the insulation substrate. This insulation structure may be used to reduce the high electric field strength at the ends of the conductive bodies of the first conductive body200and the second conductive body500(as shown inFIG.10). It should be noted that due to an unlimited number of devices that may be installed on an insulation substrate, which may be N (N≥1), correspondingly, a number of conductive bodies located on the same side of the insulation substrate is not less than N. When the N devices are connected in parallel (used to improve the current carrying capacity of the devices), their corresponding multiple conductive bodies have the same potential. At this time, the area between any two conductive bodies in the multiple conductive bodies may not set a metallized groove, and only a metallized grooves only needs to be disposed near the outer end of the outermost conductive body to improve the electric field distortion problem at the end of the outermost conductive body.

As shown inFIG.10, when the N devices are connected in series, the insulation structure may further include multiple first conductive bodies200with different potentials disposed on the same side of the insulation substrate. At this time, both sides of each first conductive body200are provided with a first groove110and a first conductive layer300. This insulation structure may be used to reduce the relative high electric field strength at the ends of the first conductive body200with different potentials.

As shown inFIG.11andFIG.12, a projection of the first conductive body200on the first surface101may be located within the range of the projection of the second conductive body500or the heat sink1000on the first surface101. At this time, in the first direction X, the end of the first conductive body200and the end of the second conductive body500are not directly opposite. At the same time, the existence of the heat sink results in a larger equivalent thickness of the end of the second conductive body500, results in eliminating of the electric field distortion, so that there is no need to dispose a metallized groove structure on both sides of the second conductive body500.

In the description of the present application, it should be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “bottom”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” and the like which indicate orientation or positional relationship based on an orientation or positional relationship shown in the attached figures, and is merely for the convenience of describing and simplifying the present application, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

In the present application, unless otherwise specified and limited, the terms “installation”, “connection”, “connecting”, “fixing” and other terms should be broadly understood, for example, it may be a fixed connection, a detachable connection, or integrated formed; it may be directly connected or indirectly connected through an intermediate medium, which may be an internal connection between two components an interaction relationship between two components. For the persons of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood based on specific circumstances.

It should be noted that in the description of the present application, the terms “first” and “second” are only used to facilitate the description of different components, which cannot be understood as indicating or implying sequential relationships, relative importance, or implying a number of indicated technical features. Therefore, features limited to “first” and “second” can explicitly or implicitly include at least one of these features.

In the present application, each embodiment or implementation is described in a progressive manner, and each embodiment focuses on a difference from other embodiments. The same and similar parts between each embodiment can be referred to each other.

In the description of the present application, the reference terms “an embodiment”, “some embodiments”, “illustrative embodiments”, “example”, “specific example”, or “some examples” refer to a specific feature, a structures, a material, or a characteristic described in combination with the embodiments or examples included in at least one embodiment or example of the present application. In the present application, the schematic expressions of the above terms may not necessarily refer to the same implementation or example. Moreover, the specific feature, the structure, the material, or the characteristic described can be combined in an appropriate manner in any one or more embodiments or examples. It should be noted that the “A or B” in some embodiments of the present application means three situations: “A”, “B”, “A and B”.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application rather than limiting it; although the present application has been described in detail with reference to the aforementioned embodiments, the persons of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not separate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present application.