TWM648064U - Electronic component and electronic device - Google Patents

Abstract

An embodiment of this application provides an electronic component. The electronic component includes a first magnetic core and a second magnetic core. A bottom surface of the first magnetic core is attached to a top surface of the second magnetic core. A first mirror surface attached to a top surface of the second magnetic core is disposed on the bottom surface of the first magnetic core, and a second mirror surface opposite to the first mirror surface is disposed on the top surface of the second magnetic core. The first magnetic core is provided with a first connection surface, the second magnetic core is provided with a second connection surface, and the first connection surface and the second connection surface are connected by using an adhesive; At least one of the first connection surface and the second connection surface is perpendicular to the first mirror surface or the second mirror surface.

Description

Electronic devices and electronic equipment

The embodiments of the present application relate to the field of power electronics technology, and in particular to an electronic device and electronic equipment.

Network transformers are also known as network isolation transformers, Ethernet transformers, and network filters. They are mainly used in: RJ45 network cards, Ethernet switches, network routers, Asymmetric Digital Subscriber Line (ADSL) ), digital equipment of Very-high-bit-rate Digital Subscriber loop (VDSL), access technology based on cable TV coaxial cable network using Ethernet protocol (Ethernet Over Cable, EOC) terminals, network Router set-top boxes, smart TVs, network cameras, PC motherboards, computer peripherals, industrial motherboards, network servers, telecommunications base stations and other equipment.

The network transformer in the prior art includes a magnetic core and a winding. The magnetic core includes a first magnetic core body and a second magnetic core body. The first magnetic core body and the second magnetic core body are fixedly connected through connecting glue. However, due to the presence of glue, there is a certain gap space between the first magnetic core body and the second magnetic core body. The existence of this gap will affect the magnetic flux circuit of the magnetic core, resulting in weak magnetism, magnetic flux leakage and other undesirable phenomena. Ultimately, the inductance of the product cannot be made high, so that it cannot meet the product inductance specifications. In order to solve the above problems, in the prior art, magnetic conductive materials, such as iron powder, ferrite, etc., are generally added to the glue to make the glue magnetic, thereby improving the magnetic leakage phenomenon and increasing the inductance of the product.

However, after adding magnetic permeable materials to the glue, the magnetic permeability of the glue is only about 10, while the magnetic permeability of the magnetic core material is greater than 1000. The difference between the two is relatively large, so the effect of adding magnetic permeable materials to the glue is not good. , In addition, adjusting the magnetically conductive material in the glue will also reduce the viscosity of the glue, causing the connection between the first magnetic core body and the second magnetic core body to be unstable.

Embodiments of the present application provide an electronic device and electronic equipment. The electronic device can effectively solve the magnetic leakage problem caused by the existence of a gap between two magnetic cores, thereby increasing the inductance of the electronic device.

A first aspect of the embodiment of the present application provides an electronic device, including: a first magnetic core and a second magnetic core, wherein the bottom surface of the first magnetic core is closely connected to the top surface of the second magnetic core, and the The bottom surface of the first magnetic core is provided with a first mirror surface that is in contact with the top surface of the second magnetic core. The top surface of the second magnetic core is provided with a second mirror surface opposite to the first mirror surface. ; The first magnetic core is provided with a first connection surface, the second magnetic core is provided with a second connection surface, and the first connection surface and the second connection surface are connected through an adhesive; so At least one of the first connecting surface and the second connecting surface is perpendicular to the first mirror surface or the second mirror surface.

The electronic device in the embodiment of the present application is connected by bonding the bottom surface of the first magnetic core and the top surface of the second magnetic core, and is provided with a bottom surface of the first magnetic core that is bonded to the top surface of the second magnetic core. A second mirror surface opposite to the first mirror surface is provided on the top surface of the first mirror surface and the second magnetic core. Since the surface of the mirror surface is relatively smooth and has small roughness, the first magnetic core and the second magnetic core can be closely adhered to each other. , this can reduce or even eliminate the gap between the first magnetic core and the second magnetic core, thereby connecting the magnetic flux loop between the first magnetic core and the second magnetic core, thereby reducing the inductance caused by magnetic leakage and magnetic field weakening. The problem is that it is too low, thereby enhancing the signal transmission capability, reducing the interference between the magnetic cores of electronic devices, and reducing the loss of network signals. In addition, by arranging a first connecting surface on the first magnetic core, by arranging a second connecting surface on the second magnetic core, and then connecting the first connecting surface and the second connecting surface through adhesive, the first magnetic core can be is fixedly connected to the second magnetic core. In addition, since at least one of the first connection surface and the second connection surface is perpendicular to the first mirror surface or the second mirror surface, the first connection surface and the second connection surface will not be located on the third side at the same time. A mirror surface and a second mirror surface, so that the first connection surface and the second connection surface will not occupy the connection space of the first magnetic core and the second magnetic core, thereby ensuring the inductance of the first magnetic core and the second magnetic core.

In an optional implementation, the second magnetic core includes a first end, a second end and a winding part; wherein the first end and the second end are respectively located on the winding. Both ends of the wire portion are arranged so that the second magnetic core has an I-shaped structure; the second mirror surface is provided on the top surfaces of the first end portion and the second end portion.

In the embodiment of the present application, by arranging second mirror surfaces on the top surfaces of the first end and the second end, both ends of the second magnetic core can be closely connected to the first magnetic core, thereby ensuring that the The magnetic flux between the first magnetic core and the second magnetic core is closed, thereby avoiding undesirable phenomena such as magnetic flux leakage and weak magnetic field, and increasing the inductance of the electronic device.

In an optional implementation, the first magnetic core has a plate-like structure, and the first magnetic core includes: a front side wall, a rear side wall, a left side wall and a right side wall; wherein the front side wall and the The rear side walls are arranged oppositely; the left side wall and the right side wall are arranged oppositely.

In an optional implementation, the first connection surface is provided at both ends of the front side wall, and the first connection surface is provided at both ends of the rear side wall; wherein, the front side wall is provided with a first connection surface at both ends of the rear side wall. The first connection surface on the side wall and the first connection surface on the rear side wall are arranged oppositely; the first connection surface and the first mirror surface or the second mirror surface are perpendicular to each other.

In the embodiment of the present application, by arranging the first connection surface on the front side wall and the rear side wall, the first connection surface and the first mirror surface or the second mirror surface can be made perpendicular to each other, thereby preventing the first connection surface from occupying the first magnetic core and the second mirror surface. The connection space between the second magnetic cores ensures that the first mirror surface and the second mirror surface are larger in size, thereby increasing the inductance of the electronic device and thereby enhancing the signal transmission capability.

In an optional implementation, the width of the first magnetic core in the radial direction of the winding portion is smaller than that of the second magnetic core, so that the first connecting surface and the second magnetic core The second connection surface is formed between the outer edges of the magnetic core; the second connection surface is located on the top surface of the second magnetic core, and the second connection surface and the first connection surface are perpendicular to each other.

By setting the width of the first magnetic core smaller than the second magnetic core, space can be provided for the arrangement of the second connection surface, thereby facilitating the fixed connection of the first magnetic core and the second magnetic core.

In an optional implementation, the width of the first magnetic core in the radial direction of the winding portion is smaller than that of the second magnetic core; at least one upwardly extending third core is provided on the first end. A convex wall, at least one first convex wall is provided on the second end, and the first convex wall is arranged opposite to the first connecting surface; the first convex wall is provided with the The second connection surface is arranged opposite to the first connection surface; the second connection surface and the first mirror surface or the second mirror surface are perpendicular to each other.

In this way, by arranging the first convex wall extending upward on the second magnetic core, the second connecting surface can be disposed on the first convex wall, so that both the first connecting surface and the second connecting surface can be disposed on the first magnetic core. outside, so that neither the first connection surface nor the second connection surface takes up the space of the first mirror surface and the second mirror surface, thereby ensuring that the contact area between the first mirror surface and the second mirror surface is large enough, thereby improving the magnetic permeability of the magnetic core. , improve the signal transmission capability of electronic devices. In addition, by providing the first convex wall, the area of the second connection surface can be increased, thereby increasing the connection reliability between the first magnetic core and the second magnetic core.

In an optional implementation, the first connection surface is provided on the left side wall, the first connection surface is provided on the right side wall, and the first connection surface on the left side wall and The first connection surfaces on the right side wall are arranged oppositely; the first connection surface and the first mirror surface or the second mirror surface are perpendicular to each other.

By arranging the first connection surface on the left and right walls of the first magnetic core, the first connection surface and the first mirror surface or the second mirror surface can be made perpendicular to each other, thereby preventing the first connection surface from occupying the first magnetic core and the second mirror surface. The connection space between the magnetic cores ensures that the first mirror surface and the second mirror surface are larger in size, thereby increasing the inductance of the electronic device and thereby enhancing the signal transmission capability.

In an optional implementation, the length of the first magnetic core in the axial direction of the winding portion is smaller than that of the second magnetic core, so that the left side wall and the right side wall are aligned with the third The second connection surface is formed between the outer edges of the two magnetic cores; the second connection surface is located on the top surface of the second magnetic core, and the second connection surface and the first connection surface are perpendicular to each other.

By setting the length of the first magnetic core to be shorter than the second magnetic core, space can be provided for the arrangement of the second connection surface, thereby facilitating the fixed connection of the first magnetic core and the second magnetic core.

In an optional implementation, the length of the first magnetic core in the axial direction of the winding portion is smaller than that of the second magnetic core; the first end is provided with a second protrusion extending upward. wall, and the second convex wall is arranged opposite to the first connection surface on the left side wall; the second convex wall is provided on the second end, and the second convex wall is connected to the first connection surface on the left side wall. The first connecting surface on the right side wall is arranged oppositely; the second connecting surface is arranged on the second convex wall, and the second connecting surface is arranged opposite to the first connecting surface; the second connecting surface is arranged oppositely; The connection surface and the first mirror surface or the second mirror surface are perpendicular to each other.

In this way, by arranging the second convex wall extending upward on the second magnetic core, the second connection surface can be provided on the second convex wall, thereby providing space for the second connection surface. In addition, the first connection surface and the second convex wall can be connected to each other. The second connection surfaces are arranged outside the first magnetic core, so that neither the first connection surface nor the second connection surface takes up the space of the first mirror surface and the second mirror surface, thereby ensuring the contact between the first mirror surface and the second mirror surface. The area is large enough to increase the magnetic permeability of the magnetic core and improve the signal transmission capability of electronic devices. In addition, by providing the second convex wall, the area of the second connection surface can be increased, thereby increasing the connection reliability between the first magnetic core and the second magnetic core.

In an optional implementation, the outer edge of the bottom surface of the first magnetic core is provided with a downwardly extending convex edge; the convex edge is located on the outer side of the second magnetic core, and the inner edge of the convex edge The wall is arranged opposite to the outer wall of the second magnetic core; the inner wall of the convex edge is provided with a first connection surface, and the outer wall of the second magnetic core is provided with a second connection surface; the first connection surface It is arranged opposite to the second connecting surface; the first connecting surface and the second connecting surface are both perpendicular to the first mirror surface or the second mirror surface.

By arranging a downwardly extending convex edge on the outside of the bottom surface of the first magnetic core, and the convex edge is located on the outside of the second magnetic core, the first mirror surface and the third mirror surface between the second magnetic core and the first magnetic core can be The size of the second mirror reaches the maximum, thereby increasing the inductance of the electronic device. In addition, by arranging the convex edge, space can be provided for the arrangement of the first connection surface, and arranging the first connection surface on the convex edge can increase the contact area between the first connection surface and the second connection surface, thereby increasing the size of the first magnetic core. and the stability of the connection to the second magnetic core.

In an optional implementation, the bottom ends of the front side wall and the rear side wall of the first magnetic core are each provided with one of the convex edges; each of the convex edges is in contact with the second magnetic core The first connection surface is provided at opposite positions; the position on the second magnetic core opposite to the first connection surface is the second connection surface.

In an optional implementation, the bottom ends of the left side wall and the right side wall of the first magnetic core are each provided with one of the convex edges; each of the convex edges is in contact with the second magnetic core The first connection surface is provided at opposite positions; the position on the second magnetic core opposite to the first connection surface is the second connection surface.

In an optional implementation, the lengths of the first mirror surface and the second mirror surface in the axial direction of the winding part are greater than the length of the winding part.

In this way, the areas of the first mirror surface and the second mirror surface can be increased, thereby increasing the contact area between the first magnetic core and the second magnetic core, thereby increasing the magnetic permeability and thereby increasing the inductance of the electronic device.

In an optional implementation, the first magnetic core and the second magnetic core have an axially symmetrical structure relative to the central axis of the winding portion.

In an optional implementation, the adhesive is glue that can withstand a reflow temperature exceeding 270°C.

In this way, when the electronic device is welded to the circuit board, the adhesive will not melt due to excessive welding temperature, thereby preventing the first magnetic core from detaching from the second magnetic core, thus reducing the scrap rate of the electronic device.

It should be noted that the soldering temperature of circuit boards is generally around 270°C.

In an optional implementation, the adhesive is epoxy glue.

By configuring the adhesive as epoxy glue, compared to the glue with magnetically conductive materials added in the prior art, the epoxy glue in the embodiment of the present application has better bonding performance because granular magnetically conductive materials are mixed into the glue. It will destroy the interaction between the molecules inside the glue, resulting in the deterioration of the adhesive properties of the glue. In addition, epoxy glue can withstand high temperatures, so that when the electronic device is welded to the circuit board, it can ensure that the adhesive will not melt and soften under heat, which will eventually lead to a gap between the first magnetic core and the second magnetic core. Falling off, shifting, eventually leading to product scrapping and other problems.

In an optional implementation manner, the roughness Ra of the first mirror surface and the second mirror surface both ranges from 0.05 to 0.2um.

A second aspect of the embodiment of the present application provides an electronic device, which includes a circuit board and the above-mentioned electronic device.

The electronic device in the embodiment of the present application is provided with the above-mentioned electronic device, because the bottom surface of the first magnetic core and the top surface of the second magnetic core of the electronic device are closely connected, and the bottom surface of the first magnetic core is provided with a second magnetic core. The top surface of the core is attached to the first mirror surface, and the top surface of the second magnetic core is provided with a second mirror surface opposite to the first mirror surface. This can reduce or even eliminate the gap between the first magnetic core and the second magnetic core. This allows the magnetic flux loop between the first magnetic core and the second magnetic core to be connected, thus reducing the problem of low inductance caused by magnetic leakage and magnetic field weakening, thereby enhancing the signal transmission capability and reducing interference between the magnetic cores of electronic devices. , reduce the loss of network signals, thereby improving the electronic performance of electronic devices.

The terms used in the implementation part of the present application are only used to explain specific embodiments of the present application and are not intended to limit the present application.

Unless the context otherwise requires, throughout the specification and claims, the term "comprise" and its other forms such as the third person singular "comprises" and the present participle "comprising" are used Interpreted as open and inclusive, it means "including, but not limited to." In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example" or "some examples" are used. examples)" and the like are intended to indicate that a particular feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

In addition, in this application, directional terms such as "front" and "back" are defined relative to the schematically placed directions of the components in the drawings. It should be understood that these directional terms are relative concepts and they are used relative to each other. The descriptions and clarifications may change accordingly according to the changes in the orientation of the components in the drawings.

In the embodiment of this application, "and/or" is just an association relationship describing related objects, indicating that there can be three relationships. For example, A and/or B can mean: A exists alone, and A and B exist simultaneously. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the related objects are in an "or" relationship. With the development of network technology, people have higher and higher requirements for network speed, and network speed is closely related to the inductance specifications of network transformers.

Network transformers usually include two magnetic cores, and the two magnetic cores are connected through glue. However, due to the setting of the glue, there is a gap between the two magnetic cores, which causes the magnetic path between the two magnetic cores not to be closed. , which leads to problems such as magnetic field weakening and magnetic leakage, causing the inductance specifications of the network transformer to fail to meet the requirements.

At present, in order to solve the above problems, magnetically conductive materials are usually added to the glue to increase the magnetic permeability of the glue. However, this method cannot greatly increase the magnetic permeability of the glue, and will also cause the viscosity of the glue to decrease, making the glue less viscous. The connection stability between the two magnetic cores is reduced, causing the network transformer to be easily scrapped. In addition, glue can also be placed on the windings of the network transformer, which can effectively reduce the gap between the two cores and improve the problem of magnetic leakage. However, after glue is placed on the winding, since the dielectric constant of the glue is greater than the dielectric constant of air, parasitic capacitance will be generated on the winding, which will lead to the deterioration of the high-frequency parameter performance of the network transformer.

In order to solve the above problems, in a first aspect, embodiments of the present application provide an electronic device, which reduces the size of the first magnetic core and the second magnetic core by configuring the connection surface between the first magnetic core and the second magnetic core to be a mirror surface. The gap between cores is used to increase the inductance.

The electronic device provided in this application may be a transformer or an inductor, or may be a network transformer or other electronic device. The electronic device network transformer will be specifically described below as an example.

The specific structure of the electronic device according to the embodiment of the present application will be described in detail below.

FIG. 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Figure 2 is a schematic diagram of the explosion structure of Figure 1. As shown in Figures 1 and 2, this embodiment provides an electronic device 100. The electronic device 100 may at least include: a first magnetic core 110 and a second magnetic core 120, wherein the bottom surface 111 of the first magnetic core 110 is in contact with the second magnetic core 120. The top surfaces 121 of the two magnetic cores 120 are closely connected, and the bottom surface 111 of the first magnetic core 110 is provided with a first mirror surface 116 that is bonded to the top surface 121 of the second magnetic core 120 . The top surface of the second magnetic core 120 121 is provided with a second mirror surface 125 opposite to the first mirror surface 116; the first magnetic core 110 is provided with a first connection surface 117, the second magnetic core 120 is provided with a second connection surface 126, the first connection surface 117 and The second connecting surfaces 126 are connected through an adhesive 130 .

The first mirror surface 116 and the second mirror surface 125 can be parallel to each other, the first connection surface 117 and the first mirror surface 116 are perpendicular to each other (equivalent to also perpendicular to the second mirror surface 125 ), and the second connection surface 126 is provided on the second magnetic core 120 on the top surface 121 , and the second connecting surface 126 is located on the extended surface of the second mirror surface 125 , that is to say, the second connecting surface 126 and the second mirror surface 125 are parallel. Of course, in some embodiments, as long as one of the first connection surface 117 and the second connection surface 126 is perpendicular to the first mirror surface 116, it can be ensured that the first connection surface 117 and the second connection surface 126 will not occupy the third connection surface. The space between the first mirror surface 116 and the second mirror surface 125 further reduces the contact area between the first magnetic core 110 and the second magnetic core 120, thereby ensuring a high inductance of the electronic device 100.

The electronic device 100 in the embodiment of the present application is connected by fitting the bottom surface 111 of the first magnetic core 110 and the top surface 121 of the second magnetic core 120, and is provided with a second magnetic core on the bottom surface 111 of the first magnetic core 110. The top surface 121 of the core 120 is attached to the first mirror surface 116, and the top surface 121 of the second magnetic core 120 is provided with a second mirror surface 125 opposite to the first mirror surface 116. Since the surface of the mirror surface is relatively smooth and has small roughness, The first magnetic core 110 and the second magnetic core 120 can be closely adhered to each other, so that the gap between the first magnetic core 110 and the second magnetic core 120 can be reduced or even eliminated, thereby making the first magnetic core 110 and the second magnetic core The magnetic flux loops between 120 are connected, thereby reducing the problem of low inductance caused by magnetic flux leakage and weak magnetic field, thereby enhancing the signal transmission capability, reducing the interference between the magnetic cores of electronic devices, and reducing the loss of network signals.

In addition, the first connection surface 117 is provided on the first magnetic core 110 , the second connection surface 126 is provided on the second magnetic core 120 , and then the first connection surface 117 and the second connection surface 126 are connected through the adhesive 130 , the first magnetic core 110 and the second magnetic core 120 can be fixedly connected. In addition, since at least one of the first connecting surface 117 and the second connecting surface 126 is perpendicular to the first mirror surface 116 or the second mirror surface 125, the first magnetic core 110 and the second magnetic core 120 are perpendicular to each other. The first connection surface 117 and the second connection surface 126 will not be located on the first mirror surface 116 and the second mirror surface 125 at the same time, so that the first connection surface 117 and the second connection surface 126 will not occupy the first magnetic core 110 and the second magnetic core. The connection space of the core 120 is thus ensured to ensure the inductance of the first magnetic core 110 and the second magnetic core 120 .

As shown in FIG. 2 , the second magnetic core 120 includes a first end 122 , a second end 123 and a winding part 124 . The first end 122 and the second end 123 are respectively located on both sides of the winding part 124 . end, so that the second magnetic core 120 has an I-shaped structure; a second mirror 125 is provided on the top surface 121 of the first end 122 and the second end 123 .

The first magnetic core 110 has a plate-like structure, and the first magnetic core 110 includes: a front side wall 112, a rear side wall 113, a left side wall 114 and a right side wall 115; wherein the front side wall 112 and the rear side wall 113 are arranged oppositely; the left side wall 114 and The right side walls 115 are arranged oppositely.

For convenience of description, in this embodiment, the side where the front side wall 112 is located is regarded as the front of the electronic device 100 , the side where the rear side wall 113 is located is regarded as the back of the electronic device 100 , and the side where the left side wall 114 is located is regarded as the back side of the electronic device 100 . On the left side, the side where the right side wall 115 is located is regarded as the right side of the electronic device 100 .

As shown in Figure 2, the left and right ends of the front side wall 112 are respectively provided with a first connection surface 117, and the left and right ends of the rear side wall 113 are respectively provided with a first connection surface 117; wherein, the first connection surface 117 on the front side wall 112 The surface 117 and the first connecting surface 117 on the rear side wall 113 are arranged oppositely; the first connecting surface 117 and the first mirror surface 116 or the second mirror surface 125 are perpendicular to each other.

The width L1 of the first magnetic core 110 in the radial direction of the winding portion 124 is smaller than the width L2 of the second magnetic core 120 , as shown in FIG. 1 , so that the front side wall 112 and the rear side wall 113 of the first magnetic core 110 can be is retracted from the outer edge of the second magnetic core 120 so that a second connecting surface 126 is formed between the first connecting surface 117 and the outer edge of the second magnetic core 120; the second connecting surface 126 is located on the top of the second magnetic core 120. On the surface 121 , that is to say, the second connection surface 126 is located on the extended surface of the second mirror surface 125 , and the second connection surface 126 and the first connection surface 117 are perpendicular to each other. By setting the width L1 of the first magnetic core 110 to be smaller than the width L2 of the second magnetic core 120, space can be provided for the arrangement of the second connection surface 126, thereby facilitating the fixed connection of the first magnetic core 110 and the second magnetic core 120. .

In the embodiment of the present application, by disposing the first connection surface 117 on the front side wall 112 and the rear side wall 113, the first connection surface 117 and the first mirror surface 116 or the second mirror surface 125 can be made perpendicular to each other, thereby preventing the first connection surface from being 117 occupies the connection space between the first magnetic core 110 and the second magnetic core 120 to ensure that the sizes of the first mirror 116 and the second mirror 125 are larger, thereby increasing the inductance of the electronic device 100 and thereby enhancing the signal transmission capability.

An adhesive 130 is disposed between the first connection surface 117 and the second connection surface 126 so that the first magnetic core 110 and the second magnetic core 120 are fixedly connected through the first connection surface 117 and the second connection surface 126 .

In addition, when the width L1 of the first magnetic core 110 in the radial direction of the winding portion 124 is smaller than the width L2 of the second magnetic core 120 , the second magnetic core 120 may also have other shapes, as shown in FIG. 3 As shown in Figure 4, the first end 122 of the second magnetic core 120 is provided with two upwardly extending first protruding walls 127. The two first protruding walls 127 are arranged oppositely, and one first protruding wall 127 and a third protruding wall 127 are arranged oppositely. Corresponding to a connecting surface 117, a second connecting surface 126 is provided on the inner wall of the first protruding wall 127. The second connecting surface 126 is arranged opposite to the first connecting surface 117. Between the first connecting surface 117 and the second connecting surface An adhesive 130 is provided between the first connection surface 117 and the second connection surface 126 . The adhesive 130 is used to firmly connect the first connection surface 117 and the second connection surface 126 .

As shown in Figure 4, two first protruding walls 127 are provided on the second end 123, the two first protruding walls 127 are arranged oppositely, and one first protruding wall 127 corresponds to a first connecting surface 117; A second connection surface 126 is provided on the inner wall of the first protruding wall 127. The second connection surface 126 is opposite to the first connection surface 117, and an adhesive is provided between the first connection surface 117 and the second connection surface 126. 130, the adhesive 130 is used to firmly connect the first connection surface 117 and the second connection surface 126.

The first connection surface 117 and the second connection surface 126 are parallel to each other, and both the first connection surface 117 and the second connection surface 126 are perpendicular to the first mirror surface 116 or the second mirror surface 125 .

In this way, by arranging the upwardly extending first convex wall 127 on the second magnetic core 120, the second connecting surface 126 can be disposed on the first convex wall 127, so that the first connecting surface 117 and the second connecting surface 126 can be evenly spaced. It is arranged outside the first magnetic core 110, so that neither the first connection surface 117 nor the second connection surface 126 takes up the space of the first mirror surface 116 and the second mirror surface 125, thereby ensuring the safety of the first mirror surface 116 and the second mirror surface 125. The contact area is large enough, thereby increasing the magnetic permeability of the magnetic core and improving the signal transmission capability of the electronic device 100 . In addition, by providing the first protruding wall 127, the area of the second connection surface 126 can be increased, thereby increasing the connection reliability between the first magnetic core 110 and the second magnetic core 120, and the first protruding wall 127 can The first magnetic core 110 is restricted within the second magnetic core 120 so that the first magnetic core 110 does not move relative to the second magnetic core 120, thereby increasing the stability of the connection between the first magnetic core 110 and the second magnetic core 120. sex.

It should be noted that in the embodiment of the present application, there are no specific restrictions on the shape, number and size of the first protruding walls 127. As long as the second connection surface 126 can be provided, it falls within the scope of the technical solution of the present application.

It should be understood that the first connecting surface 117 and the second connecting surface 126 are arranged opposite each other on both sides of the adhesive 130 . In other words, the position where the adhesive 130 is applied is where the first connecting surface 117 and the second connecting surface are arranged. 126, so the position, size and quantity of the first connection surface 117 and the second connection surface 126 are related to the location, size and quantity of the adhesive 130, and therefore are not limited in the embodiment of the present application.

It should be noted that the first magnetic core 110 has an axially symmetrical structure with respect to the central axis in the axial direction of the winding portion 124. That is to say, the first magnetic core 110 is disposed at the middle position of the second magnetic core 120, so that The lengths of the first magnetic core 110 on both sides of the central axis of the winding portion 124 are the same, so that the magnetic flux generated by the winding portion 124 can evenly pass through the first magnetic core 110 , thereby increasing the inductance of the electronic device 100 .

Of course, in some embodiments, the first magnetic core 110 may not be disposed in the middle of the second magnetic core 120 as long as it can meet the inductance of the electronic device 100. Therefore, the embodiment of the present application does not be restricted.

In an optional implementation, as shown in FIG. 1 , the length d3 of the first mirror surface 116 and the second mirror surface 125 in the axial direction of the winding part 124 is greater than the length d4 of the winding part 124 . In this way, the areas of the first mirror surface 116 and the second mirror surface 125 can be increased, thereby increasing the contact area of the first magnetic core 110 and the second magnetic core 120 , thereby increasing the magnetic permeability and thereby increasing the inductance of the electronic device 100 . Of course, in some embodiments, the length d3 of the first mirror surface 116 and the second mirror surface 125 in the axial direction of the winding part 124 may also be less than or equal to the length d4 of the winding part 124 , specifically according to the inductance of the electronic device 100 It is determined according to the quantity requirement, which is not limited in this embodiment.

In the embodiment of the present application, the adhesive 130 is glue that can withstand a reflow temperature exceeding 270°C. In this way, when the electronic device 100 is soldered to the circuit board, the adhesive 130 will not melt due to the high soldering temperature. It is understandable that the glue becomes more ductile after melting, which will cause the first magnetic core 110 and The connection between the second magnetic cores 120 is unstable. The adhesive 130 is a glue whose reflow resistance temperature is set to exceed 270° C. This can prevent the glue from melting due to heat and prevent the first magnetic core 110 and the second magnetic core 120 from cracking, thus reducing the scrap rate of the electronic device 100 .

It should be noted that the soldering temperature of circuit boards is generally around 270°C. Therefore, choosing glue with a reflow temperature resistance exceeding 270°C can meet the needs. Of course, in some embodiments with higher soldering temperatures, glue with a reflow temperature resistance exceeding 300°C, 320°C or higher can also be selected as the adhesive 130. This is not limited in the embodiments of the present application.

In this embodiment of the present application, the adhesive 130 may be epoxy glue. Of course, the adhesive 130 can also be other glues, as long as the adhesive can withstand a reflow temperature exceeding 270°C.

By configuring the adhesive 130 to be epoxy glue, compared to the glue with magnetic conductive materials added in the prior art, the epoxy glue in the embodiment of the present application has better bonding performance because granular magnetic conductive materials are mixed into the glue. The material will destroy the interaction between the molecules inside the glue, causing the glue's bonding performance to deteriorate. In addition, the epoxy glue can withstand high temperatures, so that when the electronic device 100 is welded to the circuit board, it can be ensured that the adhesive 130 will not melt and become soft when heated, eventually causing the first magnetic core 110 and the second magnetic core to 120, there will be problems such as falling off and shifting, which will eventually lead to product scrapping.

In an optional implementation manner, the roughness Ra of the first mirror surface 116 and the second mirror surface 125 both ranges from 0.05 to 0.2um.

Among them, the values of the roughness Ra of the first mirror surface 116 and the second mirror surface 125 in the embodiment of the present application may be the same or different, and the embodiment of the present application does not limit this.

For example, the roughness Ra of the first mirror surface 116 and the second mirror surface 125 can have the same value. For example, the roughness Ra of the first mirror surface 116 and the second mirror surface 125 can both be 0.05um, 0.1um, 0.15um, 0.2um and other suitable values. In other embodiments, the values of the roughness Ra of the first mirror surface 116 and the second mirror surface 125 may be different. For example, the value of the roughness Ra of the first mirror surface 116 is 0.1um, and the value of the roughness Ra of the second mirror surface 125 is 0.1um. The value of degree Ra is 0.05um.

It should be noted that the numerical values and numerical ranges involved in the embodiments of this application are approximate values. Affected by the manufacturing process, there may be a certain range of errors. Those skilled in the art can consider these errors to be negligible.

The first mirror surface 116 and the second mirror surface 125 in the embodiment of the present application are both ground mirror surfaces. Since the mirror surfaces have smooth surfaces and small roughness, after the first mirror surface 116 and the second mirror surface 125 are bonded together, The gap between the first magnetic core 110 and the second magnetic core 120 can be made small or even non-existent. In this way, the magnetic path between the first magnetic core 110 and the second magnetic core 120 can be closed, thereby increasing the inductance of the electronic device 100 .

It should be noted that the structure of the first magnetic core 110 in the embodiment of the present application includes but is not limited to the structure in the above-mentioned embodiment, and it can also be other structures. For example, the first magnetic core 110 is axially aligned with the winding portion 124 The length d1 in the direction may also be smaller than the length d2 of the second magnetic core 120 .

As shown in FIGS. 5 and 6 , the electronic device 100 provided by the embodiment of the present application may at least include: a first magnetic core 110 and a second magnetic core 120 , the bottom surface 111 of the first magnetic core 110 and the top surface of the second magnetic core 120 . The second magnetic core 120 includes a first end 122, a second end 123 and a winding part 124; the first end 122 and the second end 123 are respectively located at both ends of the winding part 124, So that the second magnetic core 120 has an I-shaped structure; the bottom surface 111 of the first magnetic core 110 is provided with a first mirror surface 116 that is in contact with the top surface 121 of the second magnetic core 120. The first end 122 and the second The top surface 121 of the end portion 123 is provided with a second mirror surface 125 opposite to the first mirror surface 116 . A first connection surface 117 is provided on the first magnetic core 110 , and a second connection surface 126 opposite to the first connection surface 117 is provided on the second magnetic core 120 . are connected through adhesive 130 .

As shown in FIG. 5 , the length d1 of the first magnetic core 110 in the axial direction of the winding portion 124 can also be smaller than the length d2 of the second magnetic core 120 , and a first magnetic core 110 can be provided on the left side wall 114 of the first magnetic core 110 . The connecting surface 117 can also be provided on the right side wall 115. The first connecting surface 117 on the left side wall 114 and the first connecting surface 117 on the right side wall 115 are arranged oppositely; the first connecting surface 117 and The first mirror surface 116 or the second mirror surface 125 is perpendicular to each other.

Since the length d1 of the first magnetic core 110 in the axial direction of the winding portion 124 can be smaller than the length d2 of the second magnetic core 120 , the left side wall 114 and the right side wall 115 of the first magnetic core 110 are both retracted from the second side. above the magnetic core 120, so that there is space for setting the second connecting surface 126 on both the top surface 121 of the first end 122 of the second magnetic core 120 and the top surface 121 of the second end 123, such as As shown in FIG. 6 , the second connection surface 126 is provided on the top surface 121 of the first end 122 and the second end 123 , and the second connection surface 126 is formed from the outer edges of the first end 122 and the second end 123 . Extending in a direction close to the winding portion 124 , the second connection surface 126 is located on the second mirror surface 125 , and the second connection surface 126 and the first connection surface 117 are perpendicular to each other.

The adhesive 130 is disposed on the first connection surface 117 and the second connection surface 126 , and the first magnetic core 110 and the second magnetic core 120 are fixedly connected through the adhesive 130 .

It should be noted that, as shown in FIG. 4 , the first connection surface 117 covers the entire left side wall 114 and the entire right side wall 115 of the first magnetic core 110 . Of course, in some embodiments, the first connection surface 117 can also be designed. A plurality of planes with smaller sizes are arranged on the left side wall 114 and the right side wall 115 at intervals. Because when connecting the first magnetic core 110 and the second magnetic core 120 , the adhesive 130 can be applied to different positions, and the positions where the adhesive 130 is applied on the first magnetic core 110 all belong to the first connection surface. 117. The positions where the adhesive 130 is applied on the second magnetic core 120 all belong to the second connection surface 126. Therefore, in this embodiment, there are no specific restrictions on the position, size and number of the first connection surface 117 and the second connection surface 126, as long as the first connection surface 117 is located on the left side wall 114 and the right side wall 115, and the The fact that the second connection surface 126 is located on the second mirror surface 125 falls within the scope of protection of the technical solution of this application.

In addition, it should be noted that in some embodiments, for example, when the size of the first magnetic core 110 and the size of the second magnetic core 120 are the same, that is, the outer edge of the first magnetic core 110 and the outer edge of the second magnetic core 120 When the outer edges are flush, the first connection surface 117 can be located on the outer edge of the first magnetic core 110, and the second connection surface 126 can be located on the second magnetic core 120 at a position vertically opposite to the first connection surface 117. In this way, The first magnetic core 110 and the second magnetic core 120 can be fixedly connected. Moreover, this can further increase the contact area between the first mirror surface 116 and the second mirror surface 125, thereby further increasing the inductance of the electronic device 100.

It should be noted that, in addition to the above-mentioned features, the embodiments in Figures 5 and 6 are different. For other features, such as the roughness of the first mirror surface 116 and the second mirror surface 125, etc., please refer to the embodiments in Figures 1 and 2. The description of the example will not be repeated here.

In addition, when the length d1 of the first magnetic core 110 in the axial direction of the winding portion 124 can be smaller than the length d2 of the second magnetic core 120 , the second magnetic core 120 can also have other shapes, such as As shown in FIGS. 7 and 8 , the length d1 of the first magnetic core 110 in the axial direction of the winding portion 124 can also be smaller than the length d2 of the second magnetic core 120 , and the first connection surface 117 is provided on the first magnetic core 110 On the left side wall 114 and the right side wall 115 . In this embodiment, the first connection surface 117 is the same size as the left side wall 114 and the right side wall 115 . Therefore, in this embodiment, the left side wall 114 is the first connection surface 117 and the right side wall 115 is also the first connection surface. 117. Of course, in some embodiments, the size of the first connection surface 117 may also be smaller than the left side wall 114 and the right side wall 115 . In the embodiment of the present application, the size and number of the first connection surface 117 are not limited.

As shown in FIG. 8 , a second protruding wall 128 extending upward is provided on the first end 122 , and the second protruding wall 128 is opposite to the first connecting surface 117 on the left side wall 114 ; A second convex wall 128 is provided, and the second convex wall 128 is opposite to the first connection surface 117 on the right side wall 115; a second connection surface 126 is provided on the second convex wall 128, and the second connection surface 126 is connected to the first connection surface 126. The connecting surfaces 117 are arranged oppositely; an adhesive 130 is provided between the first connecting surface 117 and the second connecting surface 126 , and the adhesive 130 is used to firmly connect the first connecting surface 117 and the second connecting surface 126 .

The first connection surface 117 and the second connection surface 126 are parallel to each other, and both the first connection surface 117 and the second connection surface 126 are perpendicular to the first mirror surface 116 or the second mirror surface 125 .

It should be noted that in the embodiment of the present application, there are no specific restrictions on the shape, number and size of the second protruding walls 128. As long as the second connection surface 126 can be provided, it falls within the scope of the technical solution of the present application.

By disposing the first connection surface 117 on the left side wall 114 and the right side wall 115 of the first magnetic core 110 , the first connection surface 117 and the first mirror surface 116 or the second mirror surface 125 can be made perpendicular to each other, thereby preventing the first connection surface 117 from being Occupying the connection space between the first magnetic core 110 and the second magnetic core 120 ensures that the sizes of the first mirror 116 and the second mirror 125 are larger, thereby increasing the inductance of the electronic device 100 and thereby enhancing the signal transmission capability.

By setting the length of the first magnetic core 110 to be shorter than the second magnetic core 120 , space can be provided for the second connection surface 126 , thereby facilitating the fixed connection of the first magnetic core 110 and the second magnetic core 120 .

In this way, by arranging the upwardly extending second convex wall 128 on the second magnetic core 120, the second connecting surface 126 can be disposed on the second convex wall 128, thereby providing space for the second connecting surface 126. In addition, this can The first connection surface 117 and the second connection surface 126 are both arranged outside the first magnetic core 110 so that neither the first connection surface 117 nor the second connection surface 126 takes up the space of the first mirror surface 116 and the second mirror surface 125 , thereby ensuring that the contact area between the first mirror surface 116 and the second mirror surface 125 is large enough, thereby increasing the magnetic permeability of the magnetic core and improving the signal transmission capability of the electronic device 100 . In addition, by providing the second protruding wall 128 , the area of the second connection surface 126 can be increased, thereby increasing the connection reliability between the first magnetic core 110 and the second magnetic core 120 .

It should be noted that, in addition to the above-mentioned features, the embodiments in Figures 7 and 8 are different. For other features, such as the roughness of the first mirror surface 116 and the second mirror surface 125, etc., please refer to the embodiments in Figures 1 and 2. The description of the example will not be repeated here.

In addition, in the above embodiments, the first magnetic core 110 is an electronic device 100 with a plate-like structure. In some embodiments, the first magnetic core 110 may also have other structures.

As shown in FIG. 9 , the outer edge of the bottom surface 111 of the first magnetic core 110 is provided with a downwardly extending convex edge 118 . The two convex edges 118 are respectively located between the left side wall 114 and the right side wall 115 of the first magnetic core 110 . and the convex edge 118 is located outside the second magnetic core 120. The inner wall of the convex edge 118 is opposite to the outer wall of the second magnetic core 120. The first connecting surface 117 is provided on the inner wall of the convex edge 118. A second connection surface 126 is provided on the outer wall of the core 120. The first connection surface 117 and the second connection surface 126 are arranged oppositely; and there is a gap between the inner wall of the convex edge 118 and the outer wall of the second magnetic core 120, and the adhesive 130 It is disposed in the gap so that the first magnetic core 110 and the second magnetic core 120 are fixedly connected.

In this embodiment, the first connection surface 117 and the second connection surface 126 are both perpendicular to the first mirror surface 116 or the second mirror surface 125 .

By providing a downwardly extending convex edge 118 on the outside of the bottom surface 111 of the first magnetic core 110 , and the convex edge 118 is located on the outside of the second magnetic core 120 , the relationship between the second magnetic core 120 and the first magnetic core 110 can be The size of the first mirror surface 116 and the second mirror surface 125 is maximized, thereby increasing the inductance of the electronic device 100 . In addition, by providing the convex edge 118, space can be provided for the arrangement of the first connection surface 117, and arranging the first connection surface 117 on the convex edge 118 can increase the contact area between the first connection surface 117 and the second connection surface 126. This further improves the connection stability between the first magnetic core 110 and the second magnetic core 120 .

It should be noted that the convex edge 118 of the first magnetic core 110 is not limited to being disposed on the left side wall 114 and the right side wall 115 of the first magnetic core 110 . Exemplary: As shown in Figure 10, the convex edge 118 of the first magnetic core 110 can also be provided on the front side wall 112 and the rear side wall 113 of the first magnetic core 110. The bottom ends of the side walls 113 are each provided with a convex edge 118; each convex edge 118 is provided with a first connecting surface 117 at a position opposite to the second magnetic core 120; The location is the second connection surface 126. Alternatively, as shown in FIG. 11 , a downwardly extending convex edge 118 may also be provided on the outer peripheral edge of the first magnetic core 110 . There is a gap between the convex edge 118 and the second magnetic core 120 , and an adhesive layer is provided in the gap. The first magnetic core 110 and the second magnetic core 120 are fixedly connected through the adhesive 130 .

It should be noted that the thickness of the adhesive 130 is very small. The adhesive 130 is drawn thicker in the figure for the convenience of viewing. The figure is only a schematic diagram, and therefore does not limit the scope of protection of the technical solution of the present application.

It should be noted that other structures in this embodiment are the same as those in the embodiment of FIGS. 1 and 2 . For details, please refer to the description in the embodiment of FIGS. 1 and 2 , which will not be described again here.

The electronic device 100 in the embodiment of the present application can be a transformer or an inductor, or a network transformer. When used as a network transformer, it can be applied to RJ45 network cards, Ethernet switches, network routers, ADSL, VDSL digital equipment, and EOC. Terminals, network set-top boxes, smart TVs, network cameras, PC motherboards, computer peripherals, industrial motherboards, network servers, telecommunications base stations, monitoring equipment, etc.

It should be noted that the electronic devices in the embodiments of the present application are used as inductors in many application scenarios, and they will not be listed one by one here.

In a second aspect, embodiments of the present application further provide an electronic device, which may include a circuit board and the electronic device 100 in the above embodiment, wherein the electronic device 100 is disposed on the circuit board and is electrically connected to the circuit board. In addition, it should be noted that the electronic device may also include a housing and other components, which are not specifically limited in the embodiments of the present application.

For example, the electronic device can be an RJ45 network card, an Ethernet switch, a network router, ADSL, VDSL digital device, EOC terminal, network set-top box, smart TV, network camera, PC motherboard, computer peripherals, Industrial motherboards, network servers, telecommunications base stations, monitoring equipment, etc.

It should be noted that there are many types of electronic equipment including the electronic device of the first aspect. Therefore, the embodiments of the present application do not specifically limit this. All electronic equipment provided with the electronic devices in the above embodiments belong to the present application. The scope of protection of technical solutions.

In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and restricted, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a fixed connection. Indirect connection through an intermediary can be the internal connection between two components or the interaction between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

The terms "first", "second", "third", "fourth", etc. (if present) in the description and claims of the embodiments of this application and the above-mentioned drawings are used to distinguish similar objects, and It is not necessary to describe a specific order or sequence.

100: Electronic devices 110:First magnetic core 111: Bottom surface 112: Front side wall 113:Rear side wall 114: Left wall 115:Right side wall 116:First mirror 117: First connection surface 118:convex edge 120: Second magnetic core 130: Adhesive 121:Top surface 122: first end 123:Second end 124: Winding Department 125:Second mirror 126: Second connection surface 127:First convex wall 128:Second convex wall

FIG. 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Figure 2 is a schematic diagram of the explosion structure of Figure 1. FIG. 3 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Figure 4 is a schematic diagram of the exploded structure of Figure 3. FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Figure 6 is a schematic diagram of the exploded structure of Figure 5 . FIG. 7 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Figure 8 is a schematic diagram of the exploded structure of Figure 7. FIG. 9 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. FIG. 10 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. FIG. 11 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

100: Electronic devices

110:First magnetic core

111: Bottom surface

112: Front side wall

113:Rear side wall

114: Left wall

115:Right side wall

116:First mirror

117: First connection surface

120: Second magnetic core

130: Adhesive

121:Top surface

122: first end

123:Second end

124: Winding Department

125:Second mirror

126: Second connection surface

Claims (18)

An electronic device includes: a first magnetic core and a second magnetic core, wherein the bottom surface of the first magnetic core is closely connected to the top surface of the second magnetic core, and the first magnetic core A first mirror surface that is attached to the top surface of the second magnetic core is provided on the bottom surface, and a second mirror surface opposite to the first mirror surface is provided on the top surface of the second magnetic core; The first magnetic core is provided with a first connection surface, the second magnetic core is provided with a second connection surface, and the first connection surface and the second connection surface are connected through an adhesive; At least one of a connecting surface and the second connecting surface is perpendicular to the first mirror surface or the second mirror surface. The electronic device according to claim 1, wherein the second magnetic core includes a first end portion, a second end portion and a winding portion; wherein the first end portion and the second end portion are respectively located at Both ends of the winding part are arranged so that the second magnetic core has an I-shaped structure; the second mirror surface is provided on the top surfaces of the first end part and the second end part. The electronic device according to claim 2, wherein the first magnetic core has a plate-like structure, and the first magnetic core includes: a front side wall, a rear side wall, a left side wall and a right side wall; wherein the front side wall and The rear side walls are arranged oppositely; The left side wall and the right side wall are arranged oppositely. The electronic device according to claim 3, wherein the first connection surface is provided at both ends of the front side wall, and the first connection surface is provided at both ends of the rear side wall; wherein, The first connection surface on the front side wall and the first connection surface on the rear side wall are arranged oppositely; the first connection surface and the first mirror surface or the second mirror surface are perpendicular to each other. The electronic device according to claim 4, wherein the width of the first magnetic core in the radial direction of the winding portion is smaller than that of the second magnetic core, so that the first connecting surface and the second The second connection surface is formed between the outer edges of the magnetic core; the second connection surface is located on the top surface of the second magnetic core, and the second connection surface and the first connection surface are perpendicular to each other . The electronic device according to claim 4, wherein the width of the first magnetic core in the radial direction of the winding portion is smaller than that of the second magnetic core; the first end is provided with at least one upwardly extending The first convex wall is provided with at least one first convex wall on the second end, and the first convex wall is arranged opposite to the first connection surface; the first convex wall is provided with The second connection surface is arranged opposite to the first connection surface; the second connection surface and the first mirror surface or the second mirror surface are perpendicular to each other. The electronic device according to claim 3, wherein the first connection surface is provided on the left side wall, the first connection surface is provided on the right side wall, and the first connection surface is provided on the left side wall. The first connection surface on the wall and the first connection surface on the right side wall are arranged oppositely; the first connection surface and the first mirror surface or the second mirror surface are perpendicular to each other. The electronic device according to claim 7, wherein the length of the first magnetic core in the axial direction of the winding portion is smaller than that of the second magnetic core, so that the left side wall and the right side wall are aligned with the The second connecting surface is formed between the outer edges of the second magnetic core; the second connecting surface is located on the top surface of the second magnetic core, and the second connecting surface is connected to the first connecting surface. faces are perpendicular to each other. The electronic device according to claim 7, wherein the length of the first magnetic core in the axial direction of the winding portion is smaller than that of the second magnetic core; and the first end portion is provided with an upwardly extending third Two convex walls, and the second convex wall is arranged opposite to the first connection surface on the left side wall; the second convex wall is provided on the second end, and the second convex wall The second connection surface is arranged opposite to the first connection surface on the right side wall; the second connection surface is provided on the second convex wall, and the second connection surface is opposite to the first connection surface; The second connection surface is perpendicular to the first mirror surface or the second mirror surface. The electronic device according to claim 3, wherein the outer edge of the bottom surface of the first magnetic core is provided with a downwardly extending convex edge; the convex edge is located outside the second magnetic core, and the The inner wall of the convex edge is arranged opposite to the outer wall of the second magnetic core; The first connection surface is provided on the inner wall of the convex edge, and the second connection surface is provided on the outer wall of the second magnetic core; the first connection surface and the second connection surface are arranged oppositely ; The first connection surface and the second connection surface are both perpendicular to the first mirror surface or the second mirror surface. The electronic device according to claim 10, wherein the bottom ends of the front side wall and the rear side wall of the first magnetic core are each provided with one of the convex edges; each of the convex edges is connected to the second The first connection surface is provided at opposite positions of the magnetic core; the second connection surface is provided at the position opposite to the first connection surface on the second magnetic core. The electronic device according to claim 10, wherein the bottom ends of the left side wall and the right side wall of the first magnetic core are each provided with one of the convex edges; each of the convex edges is connected to the second The first connection surface is provided at opposite positions of the magnetic core; the second connection surface is provided at the position opposite to the first connection surface on the second magnetic core. The electronic device according to any one of claims 2 to 12, wherein the length of the first mirror surface and the second mirror surface in the axial direction of the winding portion is greater than the length of the winding portion. The electronic device according to claim 13, wherein the first magnetic core and the second magnetic core have an axially symmetrical structure relative to the central axis of the winding portion. The electronic device according to any one of claims 1 to 12, wherein the adhesive is a glue that can withstand a reflow temperature exceeding 270°C. The electronic device according to claim 15, wherein the adhesive is epoxy glue. The electronic device according to claim 16, wherein the roughness Ra of the first mirror surface and the second mirror surface both ranges from 0.05 to 0.2um. An electronic device includes: a circuit board; and the electronic device according to any one of claims 1 to 17, wherein the electronic device is disposed on the circuit board and is electrically connected to the circuit board.