Shielding heat dissipation type magnetic device

Abstract

The utility model provides a shielding heat dissipation type magnetic device. The shielding heat dissipation type magnetic device comprises a magnet; the winding is arranged in the magnet; each terminal is attached to the side face and the bottom of the magnet, extends into the magnet through the side face of the magnet and is connected with the winding; the metal shell is arranged outside the magnet; and one end of the convex column is in contact with the metal shell and is in heat conduction connection with the metal shell, and the other end of the convex column extends to be inserted into the magnet and is positioned in the winding. On the basis, heat generated in the magnet can be quickly transferred to the convex column and quickly transferred to the whole metal shell through the convex column, meanwhile, the surface of the magnet is in contact with the metal shell, for example, the surface of the magnet can be tightly attached to the metal shell, and heat on the surface of the magnet is also quickly transferred to the metal shell, so that quick heat dissipation of the magnetic device is realized, and the temperature rise current of the magnetic device is improved.

Description

Technical Field

[0001] This application relates to the field of magnetic devices, specifically to a shielded heat dissipation magnetic device. Background Technology

[0002] With the rapid development of technology, especially the emergence of multifunctional devices, the demand for passive components is increasing, and magnetic components, as one type of passive element, have been widely used. Magnetic components include at least a magnet, windings, and terminals. The power loss of magnetic components mainly includes coil losses and magnet losses. Coil losses mainly include DC resistance losses, AC resistance losses, and skin effect losses, while magnet losses mainly include hysteresis losses and eddy current losses. The portion of the magnet located within the winding coil is called the magnetic core. Heat accumulation is most concentrated in this core, and the temperature rise is most likely to reach the upper limit of product application requirements. Current technology typically only places a heat sink on the outer surface of the magnet; some heat sinks also have electromagnetic shielding functions and can therefore be called metal shells. However, it is difficult to quickly transfer the heat from the magnetic core to the outside air, resulting in poor heat dissipation efficiency and effect. This also leads to a decrease in the temperature rise current of the magnetic component, limiting its use under higher current loads. Utility Model Content

[0003] In view of this, this application provides a shielded heat dissipation magnetic device, which can improve the problems of low heat dissipation efficiency, poor heat dissipation effect, and low temperature rise current of existing magnetic devices.

[0004] This application provides a shielded heat dissipation magnetic device, comprising:

[0005] magnet;

[0006] The winding is disposed within the magnet body;

[0007] Several terminals, each terminal being attached to the side and bottom of the magnet, extending through the side of the magnet into the magnet body, and connected to the winding;

[0008] A metal shell is disposed outside the magnet;

[0009] The protruding post has one end in contact with the metal shell and establishes a thermally conductive connection with the metal shell, and the other end extends into the magnet and is located inside the winding.

[0010] Optionally, one end of the protrusion abuts against or connects to the side of the metal shell facing the magnet.

[0011] Optionally, one end of the protrusion extends and is embedded in the metal shell.

[0012] Optionally, the magnet includes a first side, a second side, a third side, and a fourth side connected end to end, and the plurality of terminals are respectively attached to the first side and the third side of the magnet; the metal shell includes a first shell portion, a second shell portion, and a third shell portion connected in sequence, one end of the protrusion contacts the second shell portion, the second shell portion is attached to the top surface of the magnet, the first shell portion is attached to the second side, and the third shell portion is attached to the fourth side.

[0013] Optionally, the first housing portion and the third housing portion are provided with at least one grounding pin.

[0014] Optionally, the grounding pin is located at the bottom of the corresponding housing portion and is a strip extending along the bottom edge of the corresponding housing portion.

[0015] Optionally, the portion of the terminal that is attached to the bottom of the magnet is a patch electrode. Along the direction from the top surface of the magnet toward the bottom, the grounding pin protrudes from the bottom of the magnet and is flush with or lower than the patch electrode.

[0016] Optionally, the protrusions are flush with or protrude from the winding along the direction from the top surface of the magnet toward the bottom.

[0017] Optionally, the metal shell is a copper part, an aluminum part, or a copper-aluminum alloy structural part.

[0018] Optionally, each terminal is formed by pre-processing the lead end of the winding.

[0019] Optionally, each terminal includes at least a plurality of core strips arranged in parallel and a plurality of core heads arranged in parallel, wherein the plurality of core heads are connected to one end of the plurality of core strips to connect the plurality of core strips in series.

[0020] Optionally, the ends of each core head that connect to the corresponding core strip form an acute angle, and the minimum thickness of the end is greater than or equal to the thickness of the core strip.

[0021] As described above, in the shielded heat dissipation magnetic device of this application, a metal shell is disposed outside the magnet, exposing each terminal. One end of the protrusion contacts the metal shell and establishes a thermally conductive connection with it, while the other end extends and is inserted into the magnet and located within the winding. Here, the heat generated inside the magnet is quickly transferred to the protrusion and then quickly transferred to the entire metal shell, thereby rapidly transferring the heat accumulated in the magnetic column to the outside air to achieve rapid heat dissipation. The heat generated on the outer surface of the magnet and in the vicinity of the magnet area is quickly transferred to the shell portion of the metal shell. Through the larger shell portion area, rapid heat dissipation can also be achieved, thereby improving the overall heat dissipation efficiency, resulting in better heat dissipation and increasing the temperature rise current of the magnetic device. Attached Figure Description

[0022] Figure 1 and Figure 2 These are schematic diagrams of the magnetic device according to the first embodiment of this application from two different perspectives;

[0023] Figure 3 yes Figure 1 A structural exploded schematic diagram of the magnetic device shown.

[0024] Figure 4 and Figure 5 This is a schematic diagram showing the relative positions of the magnet and the metal shell from two different perspectives before the hot pressing process.

[0025] Figure 6 and Figure 7 These are schematic diagrams of the structure of the terminals and windings of this application from two different perspectives.

[0026] Figure 8 yes Figure 7 The side view shown when the terminals are electrically connected to the winding;

[0027] Figure 9 This is a schematic diagram of the structure after the lead ends of the winding are bent column by column;

[0028] Figure 10 yes Figure 8 A schematic diagram of the structure after the lead-out end of the wire has been flattened.

[0029] Figure 11 yes Figure 10 A schematic diagram of the structure after the lead-out end of the wire has been tinned.

[0030] Figure 12 This is a schematic diagram of the structural fit between the thermo-pressed magnet and the unbent terminal of this application;

[0031] Figure 13 This is a schematic diagram of the structure of the magnetic device according to the second embodiment of this application;

[0032] Figure 14 yes Figure 13 The magnetic device shown is a cross-sectional view along the A-A' direction;

[0033] Figure 15 yes Figure 13 The diagram shows an exploded view of the structure of the magnetic device.

[0034] First direction x, second direction y, third direction;

[0035] Magnetic device 100, magnet 1, winding 2, terminal 3, metal shell 4, protrusion 5; first magnetic part 11, second magnetic part 12, magnetic hole 110, magnetic cover 111, magnetic column 112, accommodating cavity 120, first side 101, second side 102, third side 103, first groove 121, second groove 122; core bar 31, first part 311, second part 312, third part 313; core head 32, tin layer 33, lead wire 20, first housing part 41, second housing part 42, third housing part 43, grounding pin 44, through hole 45. Detailed Implementation

[0036] To address the aforementioned technical problems in the prior art, the magnetic device of this application includes a metal shell disposed outside the magnet, exposing various terminals. On the side of the metal shell facing the magnet, the magnetic device may have a protrusion. One end of the protrusion contacts the metal shell and establishes a thermally conductive connection with it, while the other end extends and is inserted into the magnet and located within the winding. Here, the heat generated inside the magnet is rapidly transferred to the protrusion and then quickly transferred to the entire metal shell, thereby rapidly transferring the heat accumulated in the protrusion to the outside air. Simultaneously, the magnet surface is in close contact with the metal shell, and the heat on the magnet surface is also rapidly conducted to the metal shell, ultimately achieving rapid heat dissipation of the magnetic device and increasing the temperature rise current of the magnetic device.

[0037] The specific form of the shape, quantity, size, and other parameters of any of the metal shell, magnetic devices, and structural components can be determined according to the adaptability required by the actual scenario, and this application does not limit it.

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly described below in conjunction with specific embodiments and corresponding drawings. Obviously, the embodiments described below are only a part of the embodiments of this application, and not all of them. Unless otherwise specified, the following embodiments and their technical features can be combined with each other, and also belong to the technical solutions of this application.

[0039] In the description of the embodiments of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solutions of the corresponding embodiments, and are not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application.

[0040] First Embodiment

[0041] The shielded heat-dissipating magnetic device of this application can also be simply referred to as a "magnetic device". Figures 1 to 5 As shown, an example magnetic device 100 includes a magnet 1, a winding 2, several terminals 3, a metal shell 4, and protrusions 5. The number of terminals 3 can be adapted to the type of magnetic device 100, for example, Figures 1 to 3 The magnetic device 100 shown may be provided with two terminals 3.

[0042] For ease of description and understanding, combined with Figures 1 to 5 In the orientation shown, the width direction of the magnetic device 100 is referred to as the first direction x, the height direction as the second direction y, and the thickness direction as the third direction z. The first direction x, the second direction y, and the third direction z are all perpendicular to each other and can be regarded as the three coordinate axes of a three-dimensional rectangular coordinate system. It should be understood that the term "perpendicular" throughout this application does not require that the angle between the two directions must be 90°, but allows for deviations of, for example, ±10°. That is, "perpendicular" can be understood as the angle between any two directions being 80° to 100°. Similarly, the term "parallel" throughout this application does not require that the angle between the two directions be 0° or 180°, but allows for deviations of, for example, ±10°. That is, "parallel" can be understood as the angle between any two directions being 0° to 10° or 170° to 190°.

[0043] Magnet 1 can be a rectangular magnetic component made of a soft magnetic material conventional in the art. The surface of magnet 1 may or may not have an insulating layer. The magnet 1 illustrated in this application is merely an example; other examples may also have other shapes.

[0044] Combination Figure 4 and Figure 5In the example shown, the magnet 1 can be formed by hot pressing two magnetic parts, which are respectively referred to as the first magnetic part 11 and the second magnetic part 12. The first magnetic part 11 includes a magnetic cover 111 and a magnetic column 112. The magnetic column 112 is disposed on one side of the magnetic cover 111 (which can be referred to as the "bottom side"). The second magnetic part 12 is provided with a receiving cavity 120. The receiving cavity 120 is a chamber with an open top and a closed bottom. The bottom of the cavity is the bottom of the second magnetic part 12. The first magnetic part 11 is disposed on the second magnetic part 12. At this time, the magnetic column 112 is inserted into the receiving cavity 120, and the magnetic cover 111 closes the opening of the receiving cavity 120, thus forming a semi-finished product of the magnet 1. The magnetic column 112 is used to form the magnetic central column of the magnet 1. The top side of the magnetic cover 111 is used to form the top surface of the magnet 1, and the bottom of the second magnetic part 12 is used to form the bottom of the magnet 1. The corresponding sides of the first magnetic part 11 and the second magnetic part 12 are joined together to form the various sides of the magnet 1. For the formed rectangular magnet 1, it includes a first side 101, a second side 102, a third side 103 and a fourth side (not shown) connected end to end. The first side 101 and the third side 103 are arranged opposite each other along the first direction x, and the second side 102 and the fourth side are arranged opposite each other along the third direction z.

[0045] Winding 2 is a wound structure, the shape of which and the specific number of turns can be determined according to the actual scenario. For example, it can be wound from a lead wire (enameled wire) 20 with a circular cross-section.

[0046] See also Figures 6 to 8 Terminal (also known as "terminal electrode" or "external terminal") 3, a single terminal 3 includes multiple core strips 31, several core tips 32 and tin layer 33.

[0047] Combined Figures 9 to 11 As shown, each core strip 31 has a strip-shaped structure, and multiple core strips 31 are arranged side by side along the third direction z. These core heads 32 are arranged side by side along the third direction z and connected to one end of the multiple core strips 31 to connect the multiple core strips 31 in series. The multiple core strips 31 and these core heads 32 are obtained by bending the leads 20 of the winding 2 of the magnetic device 100 column by column and flattening the preset portion after bending column by column. The multiple core strips 31 are located in the preset portion.

[0048] The tin layer 33 encapsulates multiple core strips 31 in two ways: first, it encapsulates the outer surface of each core strip 31; second, it fills the space between two adjacent core strips 31. Thus, the multiple core strips 31 encapsulated with the tin layer 33 form a single sheet, which is not limited here to whether it is a planar sheet or a bent sheet. However, the tin layer 33 does not encapsulate the core tips 32.

[0049] Combined Figures 6 to 11As shown, the manufacturing method and principle of terminal 3 are as follows:

[0050] First, such as Figure 9 As shown, the winding 2 of the magnetic device 100 is formed by winding the lead wire 20. The multiple loop-shaped structures formed by winding constitute the coil body of the winding 2, and the two leads of the lead wire 20 extend outward from the coil body; then, as... Figure 9 As shown, the leads 20 of winding 2 are bent column by column, which can also be called S-shaped bends or serpentine bends, but the columns after bending are parallel; then, as Figure 10 As shown, the lead-out end of the lead wire 20 is flattened in a predetermined portion after being bent in a row. The predetermined portion includes at least the portion containing multiple core strips 31, thereby forming multiple core strips 31 arranged in parallel and several core heads 32 arranged in parallel. After the flattening process, along the lead-out direction of the lead wire 20, the first core head 32 can be regarded as being formed by a single unbent lead wire 20, appearing as a straight line. Each of the remaining core heads 32 can be regarded as being formed by a single lead wire 20 after a U-shaped bend. One end of the U-shape is connected to a core strip 31, and the other end is connected to another adjacent core strip 31. Finally, as... Figure 11 As shown, multiple core bars 31 are subjected to tin-immersion treatment to form a tin layer 33 that wraps around the multiple core bars 31 to form a planar sheet.

[0051] During the flattening process, the insulating varnish film of the lead wire 20 at the location of multiple core bars 31 is damaged by pressure, and part of it will fall off from the conductive body of the lead wire 20. During the tinning process, the tinning temperature can melt the remaining insulating varnish film, and the final flat sheet does not have any residual insulating varnish film.

[0052] The immersion temperature for forming the tin layer 33 is generally below 420℃, which is much lower than the temperature of traditional welding (such as laser welding). Therefore, it can reduce the backburning of the insulating varnish film of the lead 20 at the core 32, thereby significantly reducing the backburning length of the insulating varnish film towards the winding 2. In actual scenarios, the backburning length can be controlled to about 0.5mm, which will not penetrate the coil body of the winding 2, thus ensuring the insulation withstand voltage of the coil body and the electrical properties of the product.

[0053] Combination Figures 6 to 8 , Figure 10 and Figure 11As shown, the ends of each core head 32, i.e., the ends connected to the corresponding core strip 31, are also located in the preset portion. These ends are flattened and formed into acute angles. For example, the acute angle is α, and α ≤ 40°. That is, along the lead-out direction of the lead wire 20, the thickness of the lead wire 20 gradually decreases and eventually connects smoothly with the core strip 31. The minimum thickness of the end can be greater than or equal to the thickness of the core strip 31. Therefore, while flattening and forming multiple core strips 31, the insulating varnish film at the ends of each core head 32 can be prevented from being damaged by pressure, thus ensuring electrical insulation between the core heads 32.

[0054] In one example, combining Figures 6 to 8 As shown, each terminal 3 is a bent sheet-like component, and the manufacturing method of terminal 3 further includes: ... Figure 11 The planar sheet shown after tin-plating is bent. After bending, each core strip 31 includes three parts: a first part 311, a second part 312, and a third part 313. For each core strip 31 with uniform thickness, the thickness D1 of these three parts can be equal, for example, D1 ≤ 0.3 mm. The first part 311 is connected to the corresponding core head 32 one by one, and neither the two nor the connection point is bent. The second part 312 is perpendicularly connected to the first part 311, and the connection point is the first bending point of the bending process. The third part 313 is perpendicularly connected to the second part 312, and the connection point is the second bending point of the bending process.

[0055] Based on the above, the terminal 3 is formed by bending, flattening and tinning the lead end of the lead wire 20 of the winding 2 at least column by column. The electrical connection between the terminal 3 and the winding 2 can be achieved without welding, thereby avoiding the problem of poor electrical connection caused by welding and the electrical connection reliability is high.

[0056] The winding 2 is disposed within the magnet 1, and can be disposed as follows before hot pressing: Figure 4 In the example, within the accommodating cavity 120 of the second magnetic section 12, for any terminal 3 formed by the lead wire 20 of the winding 2, a plurality of core strips 31 (including a corresponding tin layer 33 wrapped around its outer surface) extend beyond the semi-finished part formed by the first magnetic section 11 and the second magnetic section 12 via the side of the semi-finished part. The plurality of core strips 31 are also attached to the side and bottom of the semi-finished part. Thus, in the thermoformed magnet 1, two terminals 3 and their respective plurality of core strips 31 are respectively attached to the first side 101 and the third side 103 of the magnet 1, but all the core tips 33 of each terminal 3 are disposed within the magnet 1. Here, each terminal 3 extends into the magnet 1 via the side of the magnet 1 formed by the first magnetic section 11 and the second magnetic section 12 (i.e., the first side 101 and the third side 103) and is electrically connected to the winding 2.

[0057] The metal shell 4 is disposed outside the magnet 1, for example, it can be attached to the outside of the magnet 1 so that there is a large thermal conductivity contact area between the metal shell 4 and the magnet 1. The metal shell 4 can expose each terminal 3. For example, the metal shell 4 may include a first shell part 41, a second shell part 42 and a third shell part 43 connected in sequence. The second shell part 42 is attached to the top surface of the magnet 1, the first shell part 41 is attached to the second side surface 102 of the magnet 1, and the third shell part 43 is attached to the fourth side surface of the magnet 1.

[0058] Before hot pressing, combine Figures 4 to 5 As shown, the metal shell 4 can be attached to the outside of the semi-finished part formed by the first magnetic part 11 and the second magnetic part 12. At this time, the second shell part 42 is attached to the top surface of the magnetic cover 111 of the first magnetic part 11, the first shell part 41 is attached to one side of the second side 102 corresponding to the semi-finished part, and the third shell part 43 is attached to one side of the fourth side corresponding to the semi-finished part. Here, the surface of the metal shell 4 is different from the surface of the magnet 1 attached to each terminal 3.

[0059] Continue to combine Figures 3 to 5 As shown, the first magnetic part 11 is provided with a magnetic hole 110, which is at least formed in the magnetic cover 111. Optionally, the magnetic hole 110 can penetrate the magnetic cover 111 and extend into the magnetic post 112, for example, it can penetrate the magnetic post 112. In this case, the magnetic hole 110 can extend into the receiving cavity 120 of the second magnetic part 12. The protrusion 5 can be a columnar member with a circular or other shape in cross-section. One end of the protrusion 5 is connected to the metal shell 4 and inserted into the magnetic hole 110. Here, after hot pressing and in the finally manufactured magnetic device 100, one end of the protrusion 5 contacts the second housing part 42 and establishes a thermally conductive connection with the metal shell 4. The other end of the protrusion 5 extends and is inserted into the magnet 1 and is located in the coil body of the winding 2. Here, the interior of the magnet 1 is thermally connected to the metal shell 4 through the protrusion 5.

[0060] In one example, see Figures 3 to 5 As shown, one end of the protrusion 5 can abut or connect with the side of the metal shell 4 facing the magnet 1. Abutting means that the protrusion 5 and the metal shell 4 are two separate structural components. Connecting means that the metal shell 4 and the protrusion 5 are a single-piece structural component. Of course, they can also be two separate structural components connected by means such as adhesive.

[0061] The inner surfaces of the metal shell 4 (first shell portion 41, second shell portion 42, and third shell portion 43) and the protrusions 5 are in close contact with the magnet 1. The metal shell 4 and the protrusions 5 cooperate to have at least two functions: 1. Electromagnetic shielding function: the metal shell 4, made of metal material, can effectively shield the electromagnetic radiation generated by the magnetic device 100; 2. Heat dissipation function: the metal shell 4, made of metal material, can quickly conduct and dissipate the heat inside the product, realizing rapid heat dissipation of the product, including: rapid transfer of heat generated inside the magnet 1. The heat is transferred to the protrusion 5 and then quickly to the entire metal shell 4, thereby rapidly transferring the heat accumulated in the magnetic column 112 to the outside air for rapid heat dissipation. The heat generated on the outer surface of the magnet 1 and the area near the outer surface is rapidly transferred to the first shell part 41, the second shell part 42 and the third shell part 43. The large shell part area also enables rapid heat dissipation. In this way, the overall heat dissipation efficiency is improved and the heat dissipation effect is better. At the same time, the temperature rise current of the magnetic device 100 is increased, which is beneficial for the use of the magnetic device 100 under higher current loads.

[0062] In one example, along the direction from the top surface of the magnet 1 toward the bottom, i.e., in the opposite direction of the second direction y, the protrusion 5 can be flush with or protrude from the bottom of the winding 2, thereby allowing the protrusion 5 to extend deeper into the interior of the magnet 1 for better heat dissipation.

[0063] In one example, the metal shell 4 can be made of copper, aluminum, or copper-aluminum alloy. Copper has a thermal conductivity of 401 W / (m*K), and aluminum has a thermal conductivity of 237 W / (m*K). Metal shells 4 made of these materials are conducive to rapid heat dissipation.

[0064] Continue reading Figures 1 to 5 As shown, the first housing portion 41 and the third housing portion 43 of the metal shell 4 can each be provided with at least one grounding pin 44 for grounding. Taking two grounding pins 44 as an example, each grounding pin 44 can be a strip extending along the first direction x, with one grounding pin 44 located at the bottom of the first housing portion 41 and the other grounding pin 44 located at the bottom of the third housing portion 43. All structural components and protrusions 5 of the metal shell 4 can be made of the same material, and can therefore be integrally formed structural components, for example, by die casting or by cutting and stamping.

[0065] In one example, each grounding pin 44 may protrude from the bottom of the magnet 1, along the direction from the top surface of the magnet 1 toward the bottom, i.e., in the opposite direction of the second direction y, and be flush with or lower than the portion of the terminal 3 attached to the bottom of the magnet 1. The portion of the terminal 3 attached to the bottom of the magnet 1 can be called a patch electrode, such that each grounding pin 44 protrudes from the patch electrode of each terminal 3 flush with or toward the bottom, to facilitate electrical connection between the grounding pin 44 and the ground wire of the circuit board. For example, for the third portion 313 of the core strip 31 of the terminal 3 (including the tin layer 33 wrapped around the outer surface) attached to the bottom of the magnet 1, optionally, combined with Figure 5 and Figure 12 As shown, the bottom of the second magnetic part 12 of the magnet 1 may be provided with a second groove 122, the third part 313 of the core bar 31 is attached to the second groove 122, and the grounding pin 44 may be flush with or lower than the third part 313 of the core bar 31. In another example, before the hot pressing process, the bottom of the second magnetic part 12 may be provided with a second groove 122, so that the second groove 122 at the bottom of the magnet 1 is formed after the hot pressing process; or, before the hot pressing process, the bottom of the second magnetic part 12 may not be provided with a second groove 122, but is a flat surface, and the second groove 122 is formed at the bottom of the second magnetic part 12 by a hot pressing mold during the hot pressing process.

[0066] Combined Figures 1 to 12 As shown, the manufacturing method and principle of the magnetic device 100 are as follows:

[0067] First, a winding 2 is formed by winding the lead wire 20; then, the lead ends of the lead wire 20 of the winding 2 are bent row by row to form a shape as shown. Figure 9 The structure shown; then, as Figure 10 As shown, the lead-out ends of the lead wire 20 are flattened after being bent in a series to form multiple parallel core strips 31 and several parallel core heads 32; then the multiple core strips 31 are dipped in tin, as shown. Figure 11 As shown, a tin layer 33 is formed to enclose multiple core strips 31, the tin layer 33 enclosing the multiple core strips 31 to form a planar sheet; further, the winding 2 is formed inside the magnet 1, firstly by cold pressing to form as shown in the figure. Figure 4 and Figure 5The first magnetic part 11 and the second magnetic part 12 shown have a first groove 121 on the side of the second magnetic part 12 facing the first magnetic part 11. The first magnetic part 11 may also have a first groove 121 on the side facing the second magnetic part 12 (or not). Both first grooves 121 are located outside the receiving cavity 120. Then, the winding 2 is placed in the receiving cavity 120 of the second magnetic part 12, and the first magnetic part 11 is placed on the second magnetic part 12 to form the semi-finished product. At this time, the first grooves 121 of the first magnetic part 11 and the second magnetic part 12 are aligned along the second direction y to form a receiving groove. A portion of the planar sheet formed by the tin layer 33 wrapping multiple core strips 31 is located in the receiving groove, and another portion extends out of the receiving groove. Simultaneously, the magnetic post 112 is inserted into the coil body of the winding 2, so that the lead wire 20 of the winding 2 is wound around the magnetic post 112. The magnetic cover 111 closes the accommodating cavity 120, and the multiple core strips 31 of each terminal 3 extend beyond the magnet 1 of the first magnetic part 11 and the second magnetic part 12 through the junction of the first magnetic part 11 and the second magnetic part 12. At this time, all the core heads 32 of each terminal 3 are arranged side by side in the first magnetic part 11 and the second magnetic part 12, and all the core strips 31 of each terminal 3 are arranged side by side outside the first magnetic part 11 and the second magnetic part 12. Next, the protrusion 5 is inserted into the magnetic post 112 of the first magnetic part 11, and the metal shell 4 is attached to the outside of the first magnetic part 11 and the second magnetic part 12, exposing each terminal 3. Further, as Figure 12 As shown, the metal shell 4, winding 2, first magnetic part 11, and second magnetic part 12 are subjected to hot pressing to form the first magnetic part 11 and the second magnetic part 12 into a magnet 1. The hot pressing process brings the various shell parts of the metal shell 4 and the protrusions 5 into close contact with the magnet 1. The mold temperature used in the hot pressing process is about 180°C. The material softens under the pressure of the hot pressing mold and then solidifies, forming the magnet 1. The winding 2 is located inside the magnet 1. After hot pressing, the soft magnetic material of the magnet 1 wraps around the winding 2 and the portion of the planar sheet-like part located in the receiving groove, namely all the core heads 31 and the first part 311 of each core strip 31. Finally, from Figure 12 The structural state shown is achieved by bending and attaching the planar sheet to the side and bottom of the magnet 1, thus forming a structure as shown. Figure 2 The structural state shown indicates that the required magnetic device 100 has been fabricated.

[0068] In the manufactured magnetic device 100, all the core tips 32 of each terminal 3 are arranged side-by-side inside the magnet 1, and all the core strips 31 of each terminal 3 are arranged side-by-side outside the magnet 1. Figures 1 to 3 , Figures 6 to 8As shown, the first portion 311 of each core bar 31 is completely located within the magnet 1. The length D2 of this first portion 311 along the first direction x satisfies D2≥0.1mm to ensure that the core head 32 is positioned opposite to the side of the magnet 1. Furthermore, the first portion 311 of each core bar 31 is connected to the corresponding second portion 312 on the first side 101 and third side 103 of the magnet 1. The second portion 312 of each core bar 31 is attached to the corresponding side of the magnet 1. For the two terminals 3 in the figure, the second portion 312 of the core bar 31 of one terminal 3 is attached to the first side 101 of the magnet 1, and the second portion 312 of the core bar 31 of the other terminal 3 is attached to the third side 103 of the magnet 1. The third portion 313 of the core bar 31 of all terminals 3 is attached to the bottom of the magnet 1.

[0069] Second Embodiment

[0070] This application uses the same reference numerals to identify structural elements with the same name. Based on the description of the first embodiment above, the difference lies in that, in the magnetic device 100 of this second embodiment, one end of the protrusion 5 extends and is embedded in the metal shell 4.

[0071] Combination Figures 13 to 15 As shown, the second housing portion 42 of the metal shell 4 may be provided with a through hole 45. One end of the protruding post 5 is inserted into and fixed in the through hole 45, thereby achieving the extended embedding. Optionally, the diameter of the through hole 45 is larger than the diameter of the magnetic hole 110 of the magnet 1. The protruding post 5 may include a column body and a head provided at one end of the column body. The diameter of the head is larger than the diameter of the column body, so that the protruding post 5 behaves as a bolt-like structural member with a larger top. The protruding post 5 is inserted from top to bottom and passes through the through hole 45. Then, by squeezing the metal shell 4 and the protruding post 5, the metal shell 4 deforms, causing the through hole 45 to deform. Finally, the metal shell 4 completely encloses the head of the protruding post 5 and the part where the column body and the head are combined, thereby achieving the extension embedding of one end of the protruding post 5 into the metal shell 4.

[0072] Combination Figure 13 and Figure 14 As shown, after the protrusion 5 is combined with the metal shell 4, the head of the protrusion 5 can be flush with the outer surface of the metal shell 4, that is, the outer surface of the second shell part 42. In other words, in the final magnetic device 100, the user can see the head of the protrusion 5.

[0073] In other examples, the head of the protrusion 5 may not be exposed on the outer surface of the metal shell 4. For example, although the second housing portion 42 of the metal shell 4 may also be provided with a through hole 45, the through hole 45 can be completely closed by the deformation of the metal shell 4 when the metal shell 4 and the protrusion 5 are compressed.

[0074] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. For those skilled in the art, any equivalent structural transformations made using the content of this specification and drawings are similarly included within the patent protection scope of this application.

[0075] Although this document uses terms such as "first," "second," etc., to describe various types of information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. Furthermore, the singular forms "a," "an," and "the" are intended to also include the plural forms. The terms "or" and "and / or" are interpreted as inclusive, or meaning either one or any combination thereof. Exceptions to this definition only arise when combinations of elements, functions, steps, or operations are inherently mutually exclusive in some way.

Claims

1. A shielded heat-dissipating magnetic device, characterized by, The magnetic device comprises: a magnet; a winding arranged in the magnet; a plurality of terminals, each of which is attached to a side surface and a bottom of the magnet, extends into the magnet through the side surface of the magnet, and is connected with the winding; a metal shell arranged outside the magnet; a protruding column, one end of which is in contact with the metal shell and establishes a heat conduction connection with the metal shell, and the other end of which extends into the magnet and is located in the winding.

2. The magnetic device of claim 1, wherein, One end of the protruding column is in contact with or connected to the side of the metal shell facing the magnet.

3. The magnetic device of claim 1, wherein, One end of the protruding column extends into the metal shell.

4. The magnetic device according to any one of claims 1 to 3, wherein: the magnet comprises a first side surface, a second side surface, a third side surface, and a fourth side surface connected in sequence, and the plurality of terminals are respectively attached to the first side surface and the third side surface of the magnet; the metal shell comprises a first shell part, a second shell part, and a third shell part connected in sequence, one end of the protruding column is in contact with the second shell part, the second shell part is attached to the top surface of the magnet, the first shell part is attached to the second side surface, and the third shell part is attached to the fourth side surface.

5. The magnetic device of claim 4, wherein, The first shell part and the third shell part are provided with at least one grounding pin.

6. The magnetic device of claim 5, wherein, The grounding pin is arranged at the bottom of the corresponding shell part and is a strip-shaped member extending along the bottom edge of the corresponding shell part.

7. The magnetic device of claim 5, wherein, The part of the terminal attached to the bottom of the magnet is a patch electrode, and in the direction from the top surface of the magnet to the bottom, the grounding pin protrudes from the bottom of the magnet and is flush with or lower than the patch electrode.

8. The magnetic device of claim 1, wherein, In the direction from the top surface of the magnet to the bottom, the protruding column is flush with or protrudes from the winding.

9. The magnetic device of claim 1, wherein, The metal shell is a copper member, an aluminum member, or a copper-aluminum alloy structural member.

10. The magnetic device of claim 1, wherein, Each terminal is formed after a preset treatment of the lead-out end of the lead wire of the winding.

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