Electromagnetic device giving consideration to voltage resistance and welding strength

Abstract

The invention provides an electromagnetic device giving consideration to voltage resistance and welding strength, which comprises a magnet, a plurality of terminal electrodes and a winding, the magnetic wall of the magnet is provided with a plurality of first bosses and second bosses, wire passing grooves are formed between the adjacent first bosses, at least one wire passing groove is internally provided with one second boss, and the height of the first bosses is greater than that of the second bosses; the patch electrode of the end electrode is arranged on the surface of the first boss, and the patch electrode and the side electrode are respectively positioned on different sides of the magnetic wall; a lead of the winding extends out of the magnetic wall through the wire passing groove and is welded with the side electrode; in the extending direction of the leads, the two crossed leads are welded to the different end electrodes, and one of the two crossed leads is arranged on the second boss. According to the invention, the welding strength of the SMT electrode, the lead and SMT mounting can be improved, and meanwhile, the sufficient withstand voltage margin of the product is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic devices, and in particular to an electromagnetic device that combines voltage resistance and welding strength. Background Art

[0002] With the rapid development of science and technology, especially the emergence of multifunctional equipment, the demand for passive devices is increasing. Electromagnetic devices, as one of the passive components, are also widely used, and the current demand for high current, high frequency, high reliability, etc. of electromagnetic devices is constantly upgrading. Electromagnetic devices at least include magnets, windings and end electrodes. The end electrodes mainly play two roles: one is to serve as a welding part to weld with the lead of the winding, and the other is to serve as a patch electrode to perform SMT (Surface Mounted Technology) mounting with a circuit board (such as PCB, i.e. Printed Circuit Board).

[0003] The patch electrode of the end electrode needs to be mounted on the circuit board, so it is usually set on the bottom side of the electromagnetic device. In the existing electromagnetic device, the lead of the winding extends from the magnet to the bottom side of the electromagnetic device and is welded to its patch electrode, that is, the welding surface and the SMT mounting surface are both on the same side of the electromagnetic device and belong to the same side of the end electrode. During the welding process, the welding heat energy requirement is relatively high, for example, it can reach 480℃ / 1Sec, which is easy to cause the insulation film of the lead to remain on the surface of the patch electrode, thereby causing the patch electrode to be less tightly attached during SMT mounting, resulting in reduced welding strength; and the high welding temperature is easy to cause the coating on the surface of the patch electrode to melt and agglomerate, which will also reduce the welding strength; in addition, the lead at the welding point will be flattened, resulting in a significant decrease in the ductility of the lead, which is easy to cause the product to open circuit, affecting the reliability or service life of the product. Since the lower part of the magnet does not block the winding, the solder joint is close to the winding. The welding heat will be transmitted along the metal core (such as copper core) of the lead toward the winding. The high temperature will destroy the insulation film, causing the insulation film to foam and be damaged, resulting in a long insulation failure length of the lead, generally about 0.3 to 0.5 mm, which brings short circuit risks and affects the product's withstand voltage. For electromagnetic devices with primary leads and secondary leads, the primary leads and secondary leads will cross-extrude. The leads on the first layer need to be welded at high temperature twice, while the leads on the second layer only need to be welded at high temperature once. The different number of welding times can easily cause the product's withstand voltage margin to decrease or even withstand voltage failure. Summary of the invention

[0004] In view of this, the present application provides an electromagnetic device that takes into account both voltage resistance and welding strength, which can improve the welding strength problems between chip electrodes and leads and during SMT mounting, as well as the problem of reduced voltage resistance margin or even voltage resistance failure of the product due to welding.

[0005] The present application provides an electromagnetic device that takes both withstand voltage and welding strength into consideration, including:

[0006] A magnet, comprising a magnetic cover and a magnetic core, wherein the magnetic core comprises a magnetic column and two magnetic walls arranged at two ends of the magnetic column in a first direction, wherein a first side of the magnetic wall is connected to the magnetic cover, and a second side of the magnetic wall is arranged in a second direction in a direction opposite to the first side and perpendicular to a third side, wherein a plurality of first bosses and second bosses are arranged on the second side, and wire grooves are formed between adjacent first bosses, and a second boss is arranged in at least one of the wire grooves, and a height of the first boss is greater than a height of the second boss;

[0007] A plurality of end electrodes are bonded to the corresponding magnetic wall, wherein the end electrodes include a patch electrode and a side electrode connected vertically, the patch electrode is arranged on the second side of the magnetic wall and on the table surface of the first boss, and the side electrode is bonded to the third side of the magnetic wall;

[0008] A winding is wound around the magnetic column and is located between the two magnetic walls; the lead of the winding extends to the third side of the magnetic wall through the wire slot and is welded to the side electrode; wherein two leads with a cross point are welded to different end electrodes and one of them is arranged on the second boss.

[0009] Optionally, the height of the second boss is H and satisfies: 0.5*φ≤H≤3.0*φ, where φ is the wire diameter of the lead wire.

[0010] Optionally, a third boss is also provided on the second side, and the third boss is provided in the wire groove, and the second boss is located between the first boss and the third boss, and the third boss is provided between two leads having an intersection and is located behind the intersection along the extension direction of the leads, and the height of the third boss is greater than the height of the second boss, and the height of the third boss is less than the height of the first boss.

[0011] Optionally, two connected sides of the third boss facing the two leads are respectively parallel to the corresponding leads; and / or two connected sides of the second boss facing the leads are respectively parallel to the corresponding leads.

[0012] Optionally, a fourth boss is further provided on the second side, which is arranged on both sides of the third boss together with the second boss; the fourth boss is located between the two leads; the fourth boss and the corresponding sides of the third boss are arranged relative to each other to allow the other of the two leads to pass through.

[0013] Optionally, a chamfer is provided at a junction between the wire groove and the third side of the magnetic wall.

[0014] Optionally, a convex strip protruding away from the magnetic column is provided on the third side of the magnetic wall, one end of the convex strip is connected to the magnetic cover plate, and the other end of the convex strip extends along the second direction to the third boss; a recessed area is formed between the convex strip and the adjacent end electrode, and the lead extends through the recessed area to the welding surface of the side electrode and is welded by solder.

[0015] Optionally, the solder wraps around the end of the lead and is lower than or flush with the convex strip, and the end of the lead is not deformed.

[0016] Optionally, the side electrode includes a welding portion and a main body portion arranged along the second direction, the lead extends to the welding portion and is welded to the welding portion, the solder is located in the area where the welding portion is located, the welding surface of the welding portion is sunken into the convex strip, and one end of the main body portion connected to the patch electrode protrudes from the convex strip.

[0017] Optionally, the side electrode also includes a waisted portion, and the welding portion and the main body portion are connected by the waisted portion. Along a third direction, which is parallel to the width direction of the side electrode, the width of the waisted portion is smaller than the width of either the welding portion or the main body portion.

[0018] Optionally, the first side of the main body is adjacent to the lead; the welding portion is welded to multiple leads, and the first side of the main body is parallel to the nearest lead; or, the welding portion is welded to a lead of the electromagnetic device, and the first side of the main body is parallel to the lead.

[0019] As described above, in the electromagnetic device of the present application, the patch electrode and the side electrode are arranged on both sides of the magnetic wall. When the lead is welded to the side electrode, the solder joint and the winding are isolated by the magnetic wall so that the distance between the two is relatively far, and the welding heat is difficult to be transmitted to the winding, resulting in little or no thermal damage to the winding. It can also avoid the insulating film of the lead remaining on the surface of the patch electrode, and it is not easy to cause damage to the surface plating of the patch electrode, which is conducive to ensuring the tightness of the patch electrode for SMT mounting, ensuring the welding strength and ensuring that the product has sufficient voltage resistance margin; and, side welding does not need to flatten the lead at the weldable position, and will not affect the ductility of the lead, which can not only ensure the welding strength, but also avoid product open circuit, and will not affect the reliability or service life of the product; in addition, the height difference of the cross leads is achieved through the second boss, so that the cross leads are in stress-free contact or completely separated, thereby avoiding poor voltage resistance and short circuit of the cross leads due to extrusion or welding heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of an electromagnetic device according to an embodiment of the present application from a first perspective;

[0021] Figure 2 yes Figure 1 A schematic structural diagram of the electromagnetic device from a second viewing angle;

[0022] Figure 3 yes Figure 1 A schematic structural diagram of the electromagnetic device shown in the third perspective;

[0023] Figure 4 yes Figure 1 A schematic structural diagram of the electromagnetic device shown in the fourth perspective;

[0024] Figure 5 yes Figure 1 A schematic structural diagram of the electromagnetic device shown in the fifth viewing angle;

[0025] Figure 6 yes Figures 1 to 5 A schematic structural diagram of the first end electrode shown;

[0026] Figure 7 yes Figures 1 to 5 A schematic structural diagram of the second terminal electrode shown;

[0027] Figure 8 is a schematic structural diagram of an electromagnetic device from a first perspective of another embodiment of the present application;

[0028] Fig. 9 yes Figure 8 A schematic structural diagram of the electromagnetic device from a second viewing angle;

[0029] Fig.10 yes Figure 8 A schematic structural diagram of the electromagnetic device shown in the third perspective;

[0030] Fig.11 yes Figure 8 A schematic structural diagram of the electromagnetic device shown in the fourth perspective;

[0031] Fig.12 yes Figures 8 to 11 A schematic structural diagram of the first end electrode shown;

[0032] Fig.13 yes Figures 8 to 11 Schematic diagram of the structure of the second terminal electrode shown.

[0033] First direction x Second direction y Third direction z Preset direction L

[0034] Electromagnetic Devices 100

[0035] Magnet 1

[0036] Magnetic cover 10 Magnetic core 11

[0037] Cable duct 110 Magnetic column 111 Magnetic wall 112

[0038] First boss 113 Second boss 114 Third boss 115

[0039] Raised strip 116 Concave area 117 Support portion 118

[0040] Winding 2

[0041] Lead 20 Solder 21

[0042] Terminal electrode 3

[0043] Patch electrode 31 Side electrode 32 First end electrode 3a Second end electrode 3b

[0044] Welding part 321 Main body 322 Welding surface 320 Waist part 323 Exposed surface 324

[0045] First side 325 Second side 326 Third side 327

[0046] Adhesive portion 328 Horizontal side 3271 Vertical side 3272 DETAILED DESCRIPTION

[0047] In order to solve the above technical problems existing in the prior art, in the electromagnetic device of the present application that takes into account both withstand voltage and welding strength, the magnetic wall of the magnet is provided with a plurality of first bosses and second bosses, and a wire slot is formed between adjacent first bosses, and at least one wire slot is provided with a second boss, and the height of the first boss is greater than that of the second boss; the patch electrode of the end electrode is arranged on the table of the first boss, and is located on different sides of the magnetic wall from the side electrode; the lead of the winding extends to the outside of the magnetic wall through the wire slot and is welded to the side electrode; along the extension direction of the lead, two cross leads are welded to different end electrodes and one of them is arranged on the second boss. In this way, the welding strength between the patch electrode and the lead and the SMT mounting is improved, while ensuring that the withstand voltage margin of the product is sufficient.

[0048] The specific expression of parameters such as shape, quantity, size, etc. of any of the magnet, several end electrodes, windings, magnetic walls, first bosses, second bosses, patch electrodes, and side electrodes can be determined according to the adaptability required by the actual scenario, and this application does not limit it.

[0049] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly described below in conjunction with specific embodiments and corresponding drawings. Obviously, the embodiments described below are only part of the embodiments of the present application, not all of the embodiments. In the absence of conflict, the following embodiments and their technical features can be combined with each other and also belong to the technical solutions of the present application.

[0050] In the description of the embodiments of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of the corresponding embodiments, rather than indicating or implying that a device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present application.

[0051] Please also read Figures 1 to 7 As shown, the electromagnetic device 100 of this example includes a magnet 1, a winding 2, and a plurality of end electrodes 3. The number of the end electrodes 3 may be determined according to the adaptability of the type of the electromagnetic device 100. For example, the pulse transformer shown in the figure may be provided with six end electrodes 3.

[0052] For ease of description and understanding, combined Figures 1 to 7 In the placement orientation shown, the width direction of the electromagnetic device 100 is called the first direction x, the height direction is called the second direction y, and the thickness direction is called the third direction z. The first direction x, the second direction y and the third direction z are perpendicular to each other and can be regarded as the three coordinate axes of the three-dimensional rectangular coordinate system. It should be understood that the so-called perpendicularity in the whole application does not require that the angle between the two must be 90°, but allows a deviation of, for example, ±10°, that is, the so-called perpendicularity can be understood as the angle between any two directions is 80° to 100°. Similarly, the so-called parallelism in the whole application does not require that the angle between the two must be 0° or 180°, but allows a deviation of, for example, ±10°, that is, the so-called parallelism can be understood as the angle between any two directions is 0° to 10° or 170° to 190°.

[0053] The magnet 1 includes a magnetic cover plate 10 and a magnetic core 11. The magnetic core 11 includes a magnetic column 111 and two magnetic walls 112. The two magnetic walls 112 are arranged opposite to each other along a first direction x and are respectively connected to two ends of the magnetic column 111. The two magnetic walls 112 can be symmetrically arranged along the central axis of the magnetic column 111 (the central axis is parallel to the second direction y), and the structures are completely symmetrical and identical. The magnetic core 11 can be an integrally formed structural component.

[0054] The magnetic wall 112 may be in the form of a plate or a block. Figure 1 The upper side when placed in the shown orientation) is connected to the magnetic cover plate 10, for example, by gluing.

[0055] The second side of the magnetic wall 112 is disposed opposite to the first side along the second direction y and is perpendicular to the third side. The second side may be referred to as Figure 1 The lower side when placed in the orientation shown, the third side can be referred to as Figure 1 When the electromagnetic device 100 is placed in the orientation shown, the fourth side of any magnetic wall 112 is arranged opposite to the third side along the first direction x and connected to the end of the magnetic column 111. For any magnetic wall 112, the second side may be provided with a plurality of first bosses 113, a second boss 114 and a third boss 115, and a wire groove 110 is formed between two adjacent first bosses 113, for example, Figure 5 In the example of FIG. 1 , a single magnetic wall 112 may be provided with three first bosses 113 , and two wire-passing slots 110 are formed accordingly. It should be understood that in other examples, the electromagnetic device 100 may not be provided with the third boss 115 .

[0056] A third boss 115 and a second boss 114 are provided in at least one wire groove 110, and the second boss 114 is located between the first boss 113 and the third boss 115, and the height of the first boss 113 is greater than the height of the third boss 115, and the height of the third boss 115 is greater than the height of the second boss 114. For any boss, the so-called height refers to: the distance difference between the upper surface of the boss and the bottom surface of the wire groove 110 along the second direction y, and the bottom surface of the wire groove 110 and the table surface of the boss can both be planes.

[0057] A plurality of terminal electrodes 3 are bonded to the corresponding magnetic walls 112, for example, Figures 1 to 5 In the example, the electromagnetic device 100 is provided with six terminal electrodes 3, of which three terminal electrodes 3 are bonded to one magnetic wall 112, and the other three terminal electrodes 3 are bonded to another magnetic wall 112, and the three terminal electrodes 3 on each magnetic wall 112 are arranged in sequence along the third direction z. Any terminal electrode 3 includes a vertically connected patch electrode 31 and a side electrode 32, wherein the patch electrode 31 is arranged on the second side of the magnetic wall 112 and is arranged (for example, bonded) on the table surface of the first boss 113, and the so-called table surface of the first boss 113 refers to the surface of the first boss 113 facing away from the magnet 1, that is, the surface facing the circuit board and used for SMT mounting, and the side electrode 32 is bonded to the third side of the magnetic wall 112.

[0058] The winding 2 is wound around the magnetic column 111 and is located between the two magnetic walls 112. The winding 2 can be formed by winding a lead wire 20 of an enameled wire or the like in a circle by circle, and the winding method is determined according to the adaptability, so that it is wound around the magnetic column 111 and assembled in the magnet 1. Each end of the lead wire 20 of the winding 2 can extend outside the magnet 1 and be welded to the corresponding end electrode 3. For example, in Figures 1 to 5In the example shown, the electromagnetic device 100 is a pulse transformer, the winding 2 is provided with eight lead 20 ends, and the electromagnetic device 100 is provided with six terminal electrodes 3. The shapes of the six terminal electrodes 3 are different. For the convenience of description, the two identical ones can be called first terminal electrodes 3a, and the other four identical ones can be called second terminal electrodes 3b, wherein the four lead 20 ends are respectively welded to the four second terminal electrodes 3b in a one-to-one correspondence; two of the remaining four lead 20 ends are welded to one first terminal electrode 3a, and the other two are welded to another first terminal electrode 3a.

[0059] Specifically, the lead wire 20 of the winding 2 extends to the third side of the magnetic wall 112 through the wire slot 110, and is welded to the side electrode 32 of the corresponding terminal electrode 3. Among them, there are at least two leads 20 intersecting in the path where the lead wire 20 of the winding 2 extends. The third boss 115 is arranged between the two leads 20 having the intersection point, and along the extension direction of the lead wire 20, the third boss 115 is located after the intersection point, and the two intersecting leads are welded to different terminal electrodes 3, and one of them is arranged on the second boss 114.

[0060] As described above, in the electromagnetic device 100 in this example, the patch electrode 31 and the side electrode 32 are respectively arranged on both sides of the magnetic wall 112. When the lead 20 is welded to the side electrode 32, the solder joint and the winding 2 are isolated by the magnetic wall 112 so that the distance between the two is relatively far, and the welding heat energy is difficult to be transmitted to the winding 2, resulting in little or no thermal damage to the winding 2. It can also avoid that the insulating film of the lead 20 remains on the surface of the patch electrode 31, and it is not easy to cause damage to the surface coating of the patch electrode 31, which is conducive to ensuring the tightness of the patch electrode 31 for SMT mounting, ensuring the welding strength, and ensuring that the product has sufficient voltage resistance margin; the coating of the patch electrode 31 is intact and can perfectly fit with the solder pad of the circuit board during SMT mounting, thereby avoiding the poor tinning problems caused by welding, such as dirty electrodes, blackening, nickel exposure, and reduced coplanarity.

[0061] Furthermore, the welding between the lead 20 and the side electrode 32 can be regarded as side welding, which does not need to flatten the lead 20 at the weldable position and does not affect the ductility of the lead 20. It can ensure the welding strength and avoid affecting the pressure resistance of the product.

[0062] In addition, due to the height difference formed between the table top of the second boss 114 and the bottom surface of the wire groove 110, one of the two crossed leads (also called "cross leads") 20 extends out along the bottom surface of the wire groove 110, and the other extends out along the table top of the second boss 114. That is, the cross leads 20 are set and extended with a height difference through the second boss 114, so that there is stress-free contact or complete separation between the cross leads 20. In one example, the height of the second boss 114 is H, and satisfies: 0.5*φ≤H≤3.0*φ, where φ is the wire diameter of the lead 20. Therefore, poor voltage resistance and short circuit of the cross leads 20 due to extrusion or welding heat can be avoided, further ensuring that the product has sufficient voltage resistance margin.

[0063] In situations such as shaking, the third boss 115 can ensure that the cross leads 20 will not get close to each other, which is equivalent to constraining and limiting the extension direction of the leads 20, avoiding, for example, moving back and forth roughly along the third direction z on a plane parallel to the bottom surface of the wire groove 110, thereby avoiding the leads 20 from pulling on the solder joints with the side electrodes 32 due to changes in the extension direction, which is beneficial to ensuring the welding strength.

[0064] In one example, when observing along the second direction y, the orthographic projection of the third boss 115 is a rounded triangle as a whole, and the two connected sides of the third boss 115 facing the two crossing leads 20 (i.e., the two waist sides of the triangle) are respectively parallel to the corresponding leads 20.

[0065] When observed along the second direction y, the second boss 114 has a side facing the lead 20, and the two ends of the side can be respectively connected to one side of the third boss 115 and the adjacent first boss 113. Similarly, the side of the second boss 114 facing the lead 20 is parallel to the corresponding lead 20, and the side can also be parallel to the other side of the third boss 115.

[0066] In one example, a fourth boss (not shown) may also be provided on the second side of the magnetic wall 112, and along the third direction z, the fourth boss and the second boss 114 are provided on both sides of the third boss 115; the fourth boss is located between the two cross leads 20, and the fourth boss and the corresponding side edges of the third boss 115 are arranged relative to each other to allow the other of the two cross leads 20 to pass through.

[0067] The fourth boss can not only constrain and limit the extension direction of one of the cross leads 20, but also, through the height difference between itself and the bottom surface of the wire groove 110, make the other leads 20 extending from the surface of the fourth boss have a height difference with the two cross leads 20, thereby avoiding stress-free contact or complete separation between the other leads 20 and any of the two cross leads 20, thereby further ensuring that the product has sufficient voltage resistance margin.

[0068] In the electromagnetic device 100 of the present application, the junction of the wire groove 110 and the third side of the magnetic wall 112 is provided with a chamfer. Similarly, the edge of any of the aforementioned bosses can also be provided with a chamfer. The chamfer design can make the cross section at the corresponding edge arc-shaped, that is, an arc-shaped edge, so as to avoid local damage caused by the lead 20 passing through the corresponding position, which is conducive to ensuring the insulation performance.

[0069] Please continue reading Figures 1 to 5 As shown, the third side of the magnetic wall 112 may be provided with a convex strip 116 protruding away from the magnetic column 111, one end of the convex strip 116 is connected to the magnetic cover plate 10, and the other end of the convex strip 116 extends along the second direction y to the second boss 114; in one example, the convex strip 116 and the second boss 114 may be an integrally formed structural component.

[0070] A recessed area 117 is formed between the convex strip 116 and the adjacent terminal electrode 3, and the lead wire 20 extends to the welding surface of the side electrode 32 through the recessed area 117 and is welded by solder. The recessed area 117 can make the lead wire 20 as flush as possible or lower than the outer surface of the convex strip 116, which is equivalent to forming a wire passing area on the side of the electromagnetic device 100, thereby reducing the probability of the lead wire 20 being damaged by collision, further facilitating ensuring the welding strength between the lead wire 20 and the side electrode 32, and ensuring product performance.

[0071] In one example, the solder 21 wraps around the end of the lead 20 and is lower than or flush with the convex strip 116, and the end of the lead 20 is not deformed. That is, the side welding does not flatten the lead 20 at the welding point, and does not affect the ductility of the lead 20, which can ensure the welding strength and avoid product open circuit, thereby avoiding affecting the reliability or service life of the product. Optionally, the outer surface of the solder 21 can be a plane.

[0072] Since there are two leads 20 welded to the single first terminal electrode 3a and one lead 20 welded to the single second terminal electrode 3b, that is, the number of leads 20 welded to the single first terminal electrode 3a is greater than the number of leads 20 welded to the single second terminal electrode 3b, the single first terminal electrode 3a requires a larger welding area, that is, a larger welding surface 320. In this regard, the present application can set the width of the single first terminal electrode 3a to be greater than the width of the single second terminal electrode 3b when the lengths (or "extension lengths") of the single first terminal electrode 3a and the single second terminal electrode 3b are the same. Except for the difference in width and other differences caused by the difference in width, the structural shapes of the single first terminal electrode 3a and the single second terminal electrode 3b can be the same. Figure 6 and Figure 7 yes Figure 1 The electromagnetic device 100 shown in FIG. 1 is a first terminal electrode 3a and a second terminal electrode 3b on the left side. Figures 1 to 7 As shown, the side electrode 32 includes a welding portion 321 and a main body 322 arranged along the second direction y. After the lead 20 extends from the magnet 1, it extends along the preset direction L to the welding surface 320 of the welding portion 321 and is welded to the welding surface 320. The solder 21 is located in the area where the welding portion 321 is located and on the welding surface 320. The welding surface 320 of the welding portion 321 is sunken into the convex strip 116; one end of the main body 322 connected to the patch electrode 31 protrudes from the convex strip 116.

[0073] Here, the welding surface 320 of the welding portion 321 is sunken into the third side of the magnetic wall 112 of the electromagnetic device 100, for example, sunk into the outer surface of the protrusion 116, and the end of the main body 322 connected to the patch electrode 31 protrudes from the third side of the magnetic wall 112, for example, it can protrude from the protrusion 116, that is, it protrudes from the outer surface of the protrusion 116. In the vertical direction, that is, along the second direction y, the welding point of the welding surface 320 and the lead 20 (that is, the lead welding point) will not block the main body 322, at least will not block the end of the main body 322 connected to the patch electrode 31, thereby ensuring that the SMT solder of the patch electrode 31 will not be blocked when performing SMT mounting, so that the AOI (Automated Optical Inspection) equipment can capture the image of the SMT solder, which is beneficial to vertical AOI detection and judgment.

[0074] It should be understood that in other examples, the welding surface 320 of the welding part 321 is sunken in the convex strip 116, and the end of the main body 322 connected to the patch electrode 31 protrudes from the convex strip 116. These two structural designs can be set only one. For example, the welding surface 320 of the welding part 321 is sunken in the convex strip 116, and the end of the main body 322 connected to the patch electrode 31 is flush with the convex strip 116. For another example, the welding surface 320 of the welding part 321 is flush with the convex strip 116, and the end of the main body 322 connected to the patch electrode 31 protrudes from the convex strip 116.

[0075] In one example, along the first direction x, the maximum height difference between the welding surface 320 of the welding portion 321 and the outer surface of the protrusion 116 is D1, that is, the sinking depth of the welding portion 321 is D1, and satisfies: 0.5*φ≤D1≤3.0*φ, where φ is the wire diameter of the lead 20, thereby ensuring that the welding point between the welding surface 320 and the lead 20 will not block the end of the main body 322 connected to the patch electrode 31 in the vertical direction; that is, the present application can set the welding point to be lower than the exposed surface 324 of the main body 322.

[0076] In one example, along the first direction x, the maximum height difference between the exposed surface 324 of the main body 322 and the outer surface of the protrusion 116 is D2, that is, the protruding height of the main body 322 is D2, and satisfies: 0.5*φ≤D2≤3.0*φ, where φ is the wire diameter of the lead 20, thereby ensuring that the end of the main body 322 connected to the patch electrode 31 protrudes in the vertical direction from the soldering point between the soldering surface 320 and the lead 20.

[0077] Please continue reading Figures 1 to 5 As shown, the winding 2 of the electromagnetic device 100 is arranged relative to the bottom of the electromagnetic device 100, that is, the winding 2 and the magnetic column 111 wound thereon are still at a distance not equal to zero from the bottom of the electromagnetic device 100, and the winding 2 and the magnetic column 111 wound thereon can be regarded as being suspended. In this regard, the protruding portion of the main body 322 (that is, the portion protruding from the outer surface of the convex strip 116) extends in the second direction y to the winding 2 and the magnetic column 111. That is to say, the present application can set a larger portion of the main body 322 or the entire main body 322 to protrude from the outer surface of the convex strip 116.

[0078] For other examples, see also Figures 8 to 11 In the electromagnetic device 100 of another embodiment shown, the protruding portion of the main body 322 may be lower than the winding 2. That is, the present application may only provide a small portion of the lower end of the main body 322 protruding from the outer surface of the convex strip 116.

[0079] Optional, in Figures 1 to 5In the example shown, the third side of the magnetic wall 112 may be provided with a support portion 118, which may be provided inside the protruding portion of the main body 322 to support the protruding portion of the main body 322. The protruding height of the support portion 118 is lower than the protruding height of the convex strip 116. Figures 8 to 11 In the example shown, since the protruding portion of the main body 322 is relatively small, the support portion 118 may not be provided on the third side of the magnetic wall 112 .

[0080] Please continue reading Figures 1 to 5 As shown, the side electrode 32 may also be provided with a waist portion 323, through which the welding portion 321 and the main body 322 are connected, and along the third direction z, which is parallel to the width direction of the side electrode 32, the width of the waist portion 323 is smaller than the width of either the welding portion 321 or the main body 322. That is, along the width direction of the side electrode 32 (i.e., the third direction z or the direction parallel to the third direction z), the waist portion 323 is concave at one side of the lead 20 adjacent to the welding portion 321 and the main body 322.

[0081] Optionally, for any side electrode 32, the welding surface 320 of the welding portion 321 and the exposed surface 324 of the main body 322 are parallel to the second direction y, and the maximum widths of the main body 322 and the welding portion 321 (i.e., the maximum width along the third direction z) may be equal. The side of the waist portion 323 adjacent to the lead 20 may be recessed in the main body 322 and the welding portion 321. The so-called recess may be understood as: on the side adjacent to the lead 20, the side of the waist portion 323 and the side of the main body 322 and the welding portion 321 are not a straight line parallel to the second direction y, and the side of the waist portion 323 is recessed in the direction away from the lead 20. For example, in Figures 1 to 5 In the example of , the first side 325 of the main body 322 is connected to the second side 326 of the waisted portion 323, and both are adjacent to the lead 20 of the electromagnetic device 100; the welding portion 321 is provided with a third side 327 adjacent to the lead 20, the third side 327 is an arc-shaped side and is connected to the second side 326 of the waisted portion 323, and the lead 20 extends to the welding portion 321 via the third side 327 of the welding portion 321. In the first terminal electrode 3a, the welding portion 321 is welded to multiple leads 20 of the electromagnetic device 100, and the first side 325 of the main body 322 can be parallel to the most adjacent lead 20; in the second terminal electrode 3b, the welding portion 321 is welded to a lead 20 of the electromagnetic device 100, and the first side 325 of the main body 322 can be parallel to the lead 20.

[0082] The recessed design is equivalent to narrowing the heat transfer channel between the welding portion 321 and the main body 322, which can reduce the heat generated by the welding of the welding portion 321 and transferred to the main body 322 and the electromagnetic device 100, that is, to achieve thermal isolation, improve or even eliminate the impact of this high temperature on the inductance performance.

[0083] exist Figures 1 to 7 In the example, the side electrode 32 also includes a bonding portion 328 connected to the welding portion 321, and the bonding portion 328 is arranged at an end of the welding portion 321 facing away from the main body portion 322, and the end of the lead 20 extends to the bonding portion 328 and is fixed by glue.

[0084] The bonding portion 328 can bond and fix the end of the lead 20 by high temperature insulating glue, and the high temperature insulating glue can wrap the end of the lead 20. Here, when the lead 20 is welded to the welding portion 321, the end of the lead 20 is bonded and fixed, so that the lead can be prevented from shrinking during welding.

[0085] Along the first direction x, the bonding portion 328, the end of the lead 20 and the glue are all sunken, that is, lower than the outer surface of the convex strip 116, to prevent the cured glue and the lead 20 from blocking the protruding part of the main body 322, thereby facilitating vertical AOI detection and judgment.

[0086] In one example, the bonding portion 328 and the welding portion 321 may be flush.

[0087] The present application also provides another embodiment of an electromagnetic device 100, which can be referred to in conjunction with Figures 8 to 13 As shown, for structural elements with the same name, the present application uses the same reference numerals to identify them. The welding portion 321 may be the end of the side electrode 32, that is, the bonding portion 328 is not provided; in addition, the single first end electrode 3a of this example may be provided with two patch electrodes 31, and the two patch electrodes 31 are arranged opposite to each other along the third direction z; the third side 327 of the welding portion 321 of this example may include two vertically connected sides, namely a horizontal side 3271 parallel to the third direction z and a vertical side 3272 parallel to the second direction y, and the lead 20 extends to the welding surface 320 through the horizontal side 3271. The electromagnetic device 100 of this example is the same as the aforementioned Figure 1 The similarities between the examples can be referenced to each other and will not be repeated here.

[0088] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. For ordinary technicians in this field, all equivalent structural changes made using the contents of this specification and drawings are also included in the patent protection scope of the present application.

[0089] Although the terms "first, second", etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. In addition, the singular forms "one", "an", and "the" are intended to include plural forms as well. The terms "or" and "and / or" are interpreted as inclusive, or mean any one or any combination. Only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way, an exception to this definition will occur.

Claims

1. An electromagnetic device with both withstand voltage and welding strength, characterized in that: include: A magnet, comprising a magnetic cover and a magnetic core, wherein the magnetic core comprises a magnetic column and two magnetic walls arranged at two ends of the magnetic column in a first direction, wherein a first side of the magnetic wall is connected to the magnetic cover, and a second side of the magnetic wall is arranged in a second direction in a direction opposite to the first side and perpendicular to a third side, wherein a plurality of first bosses and second bosses are arranged on the second side, and wire grooves are formed between adjacent first bosses, and a second boss is arranged in at least one of the wire grooves, and a height of the first boss is greater than a height of the second boss; A plurality of end electrodes are bonded to the corresponding magnetic wall, wherein the end electrodes include a patch electrode and a side electrode connected vertically, the patch electrode is arranged on the second side of the magnetic wall and on the table surface of the first boss, and the side electrode is bonded to the third side of the magnetic wall; A winding is wound around the magnetic column and is located between the two magnetic walls; the lead of the winding extends to the third side of the magnetic wall through the wire slot and is welded to the side electrode; wherein two leads with a cross point are welded to different end electrodes and one of them is arranged on the second boss.

2. The electromagnetic device according to claim 1, characterized in that: The height of the second boss is H and satisfies: 0.5*φ≤H≤3.0*φ, where φ is the wire diameter of the lead wire.

3. The electromagnetic device according to claim 1, characterized in that: A third boss is provided on the second side, and a third boss is also provided in the wire groove, and the second boss is located between the first boss and the third boss, and the third boss is provided between two leads having an intersection, and is located behind the intersection along the extension direction of the leads, and the height of the third boss is greater than the height of the second boss, and the height of the third boss is less than the height of the first boss.

4. The electromagnetic device according to claim 3, characterized in that: The two connected sides of the third boss facing the two leads are respectively parallel to the corresponding leads; and / or the sides of the second boss facing the leads are respectively parallel to the corresponding leads.

5. The electromagnetic device according to claim 3, characterized in that: A fourth boss is also provided on the second side, and the fourth boss and the second boss are respectively provided on both sides of the third boss; the fourth boss is located between the two leads; the fourth boss and the corresponding sides of the third boss are arranged relative to each other so that the other of the two leads can pass through.

6. The electromagnetic device according to any one of claims 1 to 5, characterized in that: A chamfer is provided at a junction of the wire groove and the third side of the magnetic wall.

7. The electromagnetic device according to any one of claims 1 to 5, characterized in that: A convex strip protruding away from the magnetic column is provided on the third side of the magnetic wall, one end of the convex strip is connected to the magnetic cover plate, and the other end of the convex strip extends along the second direction to the third boss; A recessed area is formed between the convex strip and the adjacent terminal electrode, and the lead wire extends through the recessed area to the welding surface of the side electrode and is welded by solder.

8. The electromagnetic device according to claim 7, characterized in that: The solder wraps around the end of the lead and is lower than or flush with the convex strip, and the end of the lead is not deformed.

9. The electromagnetic device according to claim 8, characterized in that: The side electrode comprises a welding portion and a main body portion arranged along the second direction, the lead wire extends to the welding portion and is welded to the welding portion, and the solder is located in the area where the welding portion is located; The welding surface of the welding part is sunken into the convex strip, and / or one end of the main body connected with the patch electrode protrudes from the convex strip.

10. The electromagnetic device according to claim 8, characterized in that The electromagnetic device further satisfies at least one of the following: The side electrode further includes a waist portion, the welding portion and the main body portion are connected by the waist portion, and along a third direction, the third direction is parallel to the width direction of the side electrode, and the width of the waist portion is smaller than the width of either the welding portion or the main body portion; The first side of the main body is adjacent to the lead; the welding portion is welded to multiple leads of the electromagnetic device, and the first side of the main body is parallel to the most adjacent lead; or the welding portion is welded to a lead of the electromagnetic device, and the first side of the main body is parallel to the lead.

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