Electromagnetic device giving consideration to voltage resistance and welding strength

Abstract

The utility model 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] This application relates to the technical field of electromagnetic devices, and particularly relates to an electromagnetic device that takes into account both voltage withstand and welding strength. Background Art

[0002] With the rapid development of technology, especially the emergence of multi-functional devices, the demand for passive devices is increasing. As one of the passive components, electromagnetic devices are widely used, and the current requirements for large current, high frequency, high reliability, etc. of electromagnetic devices are constantly escalating. An electromagnetic device at least includes a magnet, a winding, and end electrodes. The end electrodes mainly perform two functions. One is to serve as a welding part to weld with the lead of the winding, and the other is to serve as a chip electrode to perform SMT (Surface Mounted Technology) mounting with a circuit board (such as a PCB, i.e., Printed Circuit Board).

[0003] The chip electrode of the end electrode needs to be mounted on the circuit board, so it is usually arranged on the bottom side of the electromagnetic device. In existing electromagnetic devices, the lead of the winding extends from the magnet to the bottom side of the electromagnetic device and is welded to its chip electrode. That is, both the welding surface and the SMT mounting surface are on the same side of the electromagnetic device and belong to the same surface of the end electrode. During the welding process, a relatively high welding heat energy is required, for example, it can reach 480°C / 1Sec, which easily causes the insulating film of the lead to remain on the surface of the chip electrode, resulting in a poor tightness of the chip electrode during SMT mounting and a reduction in welding strength; and the high welding temperature easily causes the plating layer on the surface of the chip electrode to melt and agglomerate, which also reduces 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, easily causing the product to open circuit, affecting the reliability or service life of the product. Since the lower part of the magnet does not shield the winding, the welding point is close to the winding, and the welding heat energy will be transmitted along the metal core (such as a copper core) of the lead towards the winding. The high temperature will damage the insulating film, causing the insulating film to foam and be damaged, resulting in a relatively large insulating failure length of the lead, generally about 0.3 - 0.5 mm, bringing a short-circuit risk and affecting the voltage withstand of the product. For an electromagnetic device with a primary lead and a secondary lead, the primary lead and the secondary lead will cross and squeeze. The lead located in the first layer needs to be welded at a high temperature twice, and the lead located in the second layer only needs to be welded at a high temperature once. The different numbers of welds are extremely likely to cause a decrease in the voltage withstand margin of the product or even voltage withstand failure. Summary of the Utility Model

[0004] In view of this, this application provides an electromagnetic device that takes into account both voltage withstand and welding strength, which can improve the problems of the welding strength between the chip electrode and the lead and during SMT mounting, as well as the problems of a decrease in the voltage withstand margin of the product or even voltage withstand failure caused by welding.

[0005] An electromagnetic device that takes into account both voltage resistance and welding strength provided by the present application includes:

[0006] A magnet, including a magnetic cover plate and a magnetic core. The magnetic core includes magnetic columns and two magnetic walls oppositely arranged at both ends of the magnetic columns in a first direction. A first side of the magnetic wall is connected to the magnetic cover plate. A second side of the magnetic wall is oppositely arranged to the first side in a second direction and is perpendicular to a third side. A plurality of first bosses and second bosses are provided on the second side. A wire groove is formed between adjacent first bosses. At least one second boss is provided in one of the wire grooves. The height of the first boss is greater than the height of the second boss.

[0007] A plurality of end electrodes are bonded to corresponding magnetic walls. The end electrode includes 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 tabletop of the first boss. 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. A lead of the winding extends to the third side of the magnetic wall through the wire groove and is welded to the side electrode. Among them, two leads with a crossing 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 it satisfies: 0.5* ≤H≤3.0* , where the is the wire diameter of the lead.

[0010] Optionally, a third boss is further provided on the second side. One third boss is provided in the wire groove. The second boss is located between the first boss and the third boss. The third boss is arranged between two leads with a crossing point and is located after the crossing point along the extending direction of the leads. 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 adjacent sides of the third boss facing the two leads are respectively parallel to the corresponding leads; and / or, a side of the second boss facing the lead is parallel to the corresponding lead.

[0012] Optionally, a fourth boss is further provided on the second side. The second boss and the fourth boss are respectively arranged on both sides of the third boss. The fourth boss is located between the two leads. Opposite sides of the fourth boss and the third boss are arranged oppositely to allow the other one of the two leads to pass through.

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

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

[0015] Optionally, the solder wraps the end of the lead and is lower than or flush with the rib, 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 solder pad of the welding portion is sunken below the rib, and one end of the main body portion connected to the patch electrode protrudes from the rib.

[0017] Optionally, the side electrode further includes a waist portion. The welding portion and the main body portion are connected by the waist portion. Along the 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.

[0018] Optionally, the first side of the main body portion is adjacent to the lead; the welding portion is welded to multiple leads, and the first side of the main body portion is parallel to the nearest lead; or, the welding portion is welded to one lead of the electromagnetic device, and the first side of the main body portion 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 respectively 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 energy is difficult to transfer to the winding, resulting in little or no thermal damage to the winding. It can also prevent the insulating film of the lead from remaining on the surface of the patch electrode, and is not likely to cause damage to the surface plating of the patch electrode, which is beneficial to ensuring the tightness of the SMT mounting of the patch electrode, ensuring the welding strength while ensuring sufficient withstand voltage margin of the product; moreover, side welding does not require flattening the lead at the weldable part, which does not affect the ductility of the lead, can ensure the welding strength, and can also prevent the product from opening, without affecting the reliability or service life of the product; in addition, the height difference of the crossed leads is achieved through the second boss, so that there is no stress contact or complete separation between the crossed leads, avoiding withstand voltage failure and short circuit caused by extrusion or welding heat energy of the crossed leads. Description of the Drawings

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

[0021] Figure 2 is Figure 1 a schematic structural diagram of the electromagnetic device from the second perspective shown;

[0022] Figure 3 is Figure 1 a schematic structural diagram of the electromagnetic device from the third perspective shown;

[0023] Figure 4 is Figure 1 a schematic structural diagram of the electromagnetic device from the fourth perspective shown;

[0024] Figure 5 is Figure 1 a schematic structural diagram of the electromagnetic device from the fifth perspective shown;

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

[0026] Figure 7 is Figures 1 to 5 a schematic structural diagram of the second end electrode shown;

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

[0028] Figure 9 is Figure 8 a schematic structural diagram of the electromagnetic device from the second perspective shown;

[0029] Figure 10 is Figure 8 a schematic structural diagram of the electromagnetic device from the third perspective shown;

[0030] Figure 11 is Figure 8 a schematic structural diagram of the electromagnetic device from the fourth perspective shown;

[0031] Figure 12 is Figures 8 to 11 a schematic structural diagram of the first end electrode shown;

[0032] Figure 13 is Figures 8 to 11 a schematic structural diagram of the second end electrode shown.

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

[0034] Electromagnetic device 100

[0035] Magnet 1

[0036] Magnetic cover plate 10, magnetic core 11

[0037] Wire groove 110, magnetic post 111, magnetic wall 112

[0038] First boss 113, second boss 114, third boss 115

[0039] Rib 116, recessed area 117, support part 118

[0040] Winding 2

[0041] Lead wire 20, solder 21

[0042] Terminal electrode 3

[0043] Patch electrode 31, side electrode 32, first terminal electrode 3a, second terminal electrode 3b

[0044] Welding part 321, main body part 322, welding surface 320, waist part 323, exposed surface 324

[0045] First side 325, second side 326, third side 327

[0046] Bonding part 328, horizontal side 3271, vertical side 3272 Specific implementation mode

[0047] To solve the above-mentioned technical problems existing in the prior art, in the electromagnetic device of the present application that takes into account voltage resistance and welding strength, a plurality of first bosses and second bosses are provided on the magnetic wall of the magnet, a wire groove is formed between adjacent first bosses, at least one second boss is provided in one wire groove, and the height of the first boss is greater than the height of the second boss; the patch electrode of the terminal electrode is arranged on the tabletop of the first boss and is located on different sides of the magnetic wall from the side electrode; the lead wire of the winding extends to the outside of the magnetic wall through the wire groove and is welded to the side electrode; along the extending direction of the lead wire, two crossed lead wires are welded to different terminal electrodes and one of them is arranged on the second boss. In this way, the welding strength between the patch electrode and the lead wire and SMT mounting is improved, and at the same time, the sufficient voltage resistance margin of the product is ensured.

[0048] The specific manifestation forms of parameters such as the shape, quantity, size, etc. of any one of the magnet, a plurality of terminal electrodes, winding, magnetic wall, first boss, second boss, patch electrode and side electrode can be determined according to the actual scenario requirements, and the present application does not limit them.

[0049] 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 the corresponding drawings. Obviously, the embodiments described below are only a part of the embodiments of this application, rather than all of them. Without conflict, the various embodiments and their technical features described below can be combined with each other, and they also belong to the technical solutions of this application.

[0050] 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 drawings. They are only for facilitating the description of the technical solutions of the corresponding embodiments, rather than indicating or implying that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as a limitation to this application.

[0051] Please refer to 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 end electrodes 3 can be determined adaptively according to the type of the electromagnetic device 100. For example, the pulse transformer shown in the figure can be provided with six end electrodes 3.

[0052] For the convenience of description and understanding, in combination with Figures 1 to 7 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 in pairs and can be regarded as the three coordinate axes of a three-dimensional rectangular coordinate system. It should be understood that the so-called perpendicularity throughout this application does not require the angle between the two to be exactly 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 being 80° to 100°. Similarly, the so-called parallelism throughout this application does not require the angle between the two to be exactly 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 being 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 the first direction x and are respectively connected to both ends of the magnetic column 111. These two magnetic walls 112 can be symmetrically arranged along the central axis of the magnetic column 111 (this central axis is parallel to the second direction y), and the structures are completely symmetric and the same. The magnetic core 11 can be an integrally formed structural member.

[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 two magnetic walls 112. The winding 2 can be wound turn by turn with a lead 20 of a type such as enameled wire, and the winding method is determined adaptively, so as to be wound around the magnetic column 111 and assembled in the magnet 1. Each end of the lead 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 5 In the illustrated example, 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 end electrodes 3. The shapes of the six end electrodes 3 are different. For the convenience of description, two identical ones can be called the first end electrodes 3a, and the other four identical ones can be called the second end electrodes 3b. Four of the lead 20 ends are respectively welded to the four second end electrodes 3b in a one-to-one correspondence; two of the remaining four lead 20 ends are welded to one first end electrode 3a, and the other two are welded to the other first end electrode 3a.

[0059] Specifically, the lead 20 of the winding 2 extends to the third side of the magnetic wall 112 through the wire groove 110 and is welded to the side electrode 32 of the corresponding end electrode 3. Among them, there are at least two leads 20 that cross each other in the path where the lead 20 of the winding 2 extends. The third boss 115 is arranged between the two leads 20 having the intersection point, and along the extending direction of the lead 20, the third boss 115 is located after the intersection point. The two crossed leads are welded to different end 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. The welding heat energy is difficult to transfer to the winding 2, and the thermal damage to the winding 2 is small or even non-existent. It can also prevent the insulating film of the lead 20 from remaining on the surface of the patch electrode 31, and is not likely to cause damage to the surface plating of the patch electrode 31, which is beneficial to ensuring the tightness of the SMT mounting of the patch electrode 31, ensuring the welding strength while ensuring sufficient voltage withstand margin of the product; the plating of the patch electrode 31 is intact and can be perfectly fitted with the solder pad of the circuit board during SMT mounting, thereby avoiding problems such as poor soldering after welding, such as electrode contamination, blackening, nickel exposure, and coplanarity decline.

[0061] Moreover, the welding of the above-mentioned lead 20 to the side electrode 32 can be regarded as side welding. This side welding does not require flattening the lead 20 at the weldable part, does not affect the ductility of the lead 20, can ensure the welding strength, and can also avoid affecting the voltage withstand of the product.

[0062] In addition, since a height difference is formed between the tabletop of the second boss 114 and the bottom surface of the wire groove 110, one of the two crossed leads (also known as "crossed leads") 20 extends along the bottom surface of the wire groove 110, and the other extends along the tabletop of the second boss 114. That is, the height difference setting and extension of the crossed leads 20 are carried out through the second boss 114, so that the crossed leads 20 are in stress-free contact or completely separated. In one example, the height of the second boss 114 is H, and it satisfies: 0.5* ≤H≤3.0* , is the wire diameter of the lead 20. Therefore, it is possible to avoid poor withstand voltage and short circuit caused by extrusion or welding heat energy of the crossed leads 20, and further ensure sufficient withstand voltage margin of the product.

[0063] In cases such as shaking, etc., the third boss 115 can ensure that the crossed leads 20 do not approach each other, which is equivalent to restricting and limiting the extension direction of the leads 20, and avoiding, for example, moving back and forth substantially along the third direction z in a plane parallel to the bottom surface of the wire groove 110, so as to avoid the pulling of the solder joints with the side electrodes 32 due to the change in the extension direction of the leads 20, 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 as a whole is in the shape of a rounded triangle. The two connected side edges of the third boss 115 facing the two crossed leads 20 (i.e., the two waist edges of the triangle) are respectively parallel to the corresponding leads 20.

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

[0066] In one example, a fourth boss (not shown in the figure) can also be provided on the second side of the magnetic wall 112. Along the third direction z, the fourth boss and the second boss 114 are respectively arranged on both sides of the third boss 115; the fourth boss is located between the two crossed leads 20, and the corresponding side edges of the fourth boss and the third boss 115 are arranged oppositely so that the other one of the two crossed leads 20 can pass through.

[0067] The fourth boss can not only restrict and limit the extension direction of one of the crossover leads 20, but also, due to the height difference between itself and the bottom surface of the wire groove 110, create a height difference between the other leads 20 extending from the surface of the fourth boss and the two crossover leads 20. Therefore, it can prevent the other leads 20 from having stress-free contact or complete separation with either of the two crossover leads 20, thereby further ensuring sufficient withstand voltage margin for the product.

[0068] At the junction of the wire groove 110 and the third side of the magnetic wall 112 in the electromagnetic device 100 of the present application, a chamfer is provided. Similarly, chamfers can also be provided at the edges of any of the aforementioned bosses. The chamfer design can make the cross-section at the corresponding edge arc-shaped, that is, an arc-shaped edge angle, thereby avoiding local damage caused when the lead 20 passes through the corresponding position, which is beneficial to ensuring the insulation performance.

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

[0070] A recessed area 117 is formed between the rib 116 and the adjacent end electrode 3. The lead 20 extends through the recessed area 117 to the solder pad of the side electrode 32 and is soldered by solder. The recessed area 117 can make the lead 20 as flush with or lower than the outer surface of the rib 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 20 being damaged by collision, further facilitating ensuring the soldering strength between the lead 20 and the side electrode 32, and ensuring the product performance.

[0071] In one example, the solder 21 wraps the end of the lead 20 and is lower than or flush with the rib 116, and the end of the lead 20 is not deformed. That is, the side soldering does not flatten the lead 20 at the solder joint, does not affect the ductility of the lead 20, can ensure the soldering strength, and can also avoid product open circuit and affect the reliability or service life of the product. Optionally, the outer surface of the solder 21 can be a flat surface.

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

[0073] Herein, the soldering surface 320 of the soldering portion 321 is sunken into the third side of the magnetic wall 112 of the electromagnetic device 100, for example, sunken into the outer surface of the rib 116. One end of the main body portion 322 connected to the patch electrode 31 protrudes from the third side of the magnetic wall 112, for example, can protrude from the rib 116, that is, protrude from the outer surface of the rib 116. In the vertical direction, that is, along the second direction y, the solder joint of the soldering surface 320 and the lead 20 (i.e., the lead solder joint) will not block the main body portion 322, at least not the end of the main body portion 322 connected to the patch electrode 31, thereby ensuring that the SMT solder during SMT mounting of the patch electrode 31 will not be blocked, enabling the AOI (Automated Optical Inspection) device to capture the image of the SMT solder, which is beneficial for vertical AOI detection and determination.

[0074] It should be understood that in other examples, only one of the following two structural designs can be provided: the welding surface 320 of the welding part 321 is sunken below the rib 116, and one end of the main body part 322 connected to the patch electrode 31 protrudes above the rib 116. For example, the welding surface 320 of the welding part 321 is sunken below the rib 116, and one end of the main body part 322 connected to the patch electrode 31 is flush with the rib 116. Another example is that the welding surface 320 of the welding part 321 is flush with the rib 116, and one end of the main body part 322 connected to the patch electrode 31 protrudes above the rib 116.

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

[0076] In one example, along the first direction x, the maximum height difference between the exposed surface 324 of the main body part 322 and the outer surface of the rib 116 is D2, that is, the protruding height of the main body part 322 is D2, and it satisfies: 0.5* ≤D2≤3.0* , where the is the wire diameter of the lead 20. In this way, it can be ensured that one end of the main body part 322 connected to the patch electrode 31 protrudes above the solder joint between the welding surface 320 and the lead 20 in the vertical direction.

[0077] Please continue to refer to Figures 1 to 5 As shown, the winding 2 of the electromagnetic device 100 is disposed opposite to the bottom of the electromagnetic device 100, that is, there is a non-zero distance between the winding 2 and the magnetic column 111 it winds and the bottom of the electromagnetic device 100. It can be regarded that the winding 2 and the magnetic column 111 it winds are suspended. In this regard, the protruding part of the main body part 322 (that is, the part protruding above the outer surface of the rib 116) extends to the winding 2 and the magnetic column 111 in the second direction y. That is to say, in the present application, a relatively large part or the entire main body part 322 of the main body part 322 can be set to protrude above the outer surface of the rib 116.

[0078] In other examples, for example, please refer to the electromagnetic device 100 of another embodiment shown in Figures 8 to 11 together. The protruding part of the main body part 322 can be lower than the winding 2. That is to say, in the present application, only a small part of the lower end of the main body part 322 can be set to protrude above the outer surface of the rib 116.

[0079] Optionally, in Figures 1 to 5 the illustrated example, a support portion 118 may be provided on the third side of the magnetic wall 112, and the support portion 118 may be provided inside the protruding portion of the main body portion 322 to support the protruding portion of the main body portion 322. The protruding height of the support portion 118 is lower than the protruding height of the rib 116. Referring to Figures 8 to 11 the illustrated example, since the protruding portion of the main body portion 322 is small, the support portion 118 may not be provided on the third side of the magnetic wall 112.

[0080] Please continue to refer to Figures 1 to 5 as shown, the side electrode 32 may further be provided with a waist portion 323, and the welding portion 321 and the main body portion 322 are connected through the waist portion 323. Along the third direction z, the third direction z is parallel to the width direction of the side electrode 32, and the width of the waist portion 323 is smaller than the width of any one of the welding portion 321 and the main body portion 322. That is to say, along the width direction of the side electrode 32 (i.e., the third direction z or a direction parallel to the third direction z), the side of the waist portion 323 adjacent to the lead 20 is recessed from the welding portion 321 and the main body portion 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 portion 322 are both parallel to the second direction y, and the maximum widths of the main body portion 322 and the welding portion 321 (i.e., the maximum widths along the third direction z) may be equal. The side of the waist portion 323 adjacent to the lead 20 may be recessed from the main body portion 322 and the welding portion 321. The so-called recess can be understood as: on the side adjacent to the lead 20, the side edge of the waist portion 323 and the side edges of the main body portion 322 and the welding portion 321 are not a straight line parallel to the second direction y, and the side edge of the waist portion 323 is recessed in a direction away from the lead 20. For example, in Figures 1 to 5 the example, the first side edge 325 of the main body portion 322 is connected to the second side edge 326 of the waist 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 edge 327 adjacent to the lead 20, and the third side edge 327 is an arc-shaped side edge and is connected to the second side edge 326 of the waist portion 323, and the lead 20 extends to the welding portion 321 through the third side edge 327 of the welding portion 321. In the first end electrode 3a, the welding portion 321 is welded to multiple leads 20 of the electromagnetic device 100, and the first side edge 325 of the main body portion 322 may be parallel to the closest lead 20; in the second end electrode 3b, the welding portion 321 is welded to one lead 20 of the electromagnetic device 100, and the first side edge 325 of the main body portion 322 may be parallel to this lead 20.

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

[0083] In Figures 1 to 7 the example of, the side electrode 32 further includes an adhesive part 328 connected to the welding part 321. The adhesive part 328 is arranged at one end of the welding part 321 facing away from the main body part 322, and the end of the lead 20 extends to the adhesive part 328 and is fixedly bonded by glue.

[0084] The adhesive part 328 can fixedly bond the end of the lead 20 through high-temperature insulating glue, and the high-temperature insulating glue can wrap the end of the lead 20. Herein, when the lead 20 is welded to the welding part 321, the end of the lead 20 is fixedly bonded, so the retraction of the lead during welding can be avoided.

[0085] Along the first direction x, the adhesive part 328, the end of the lead 20 and the glue are all sunken, that is, lower than the outer surface of the rib 116, to avoid the cured glue and the lead 20 from blocking the protruding part of the main body part 322, which is beneficial to vertical AOI detection and determination.

[0086] In one example, the adhesive part 328 and the welding part 321 can be flush.

[0087] The present application also provides an electromagnetic device 100 of another embodiment. Referring together to Figures 8 to 13 as shown, for structural elements with the same name, the present application uses the same reference numerals for identification. The welding part 321 can be the end of the side electrode 32, that is, the adhesive part 328 is not provided; in addition, two patch electrodes 31 can be provided on a single first end electrode 3a in this example, and these two patch electrodes 31 are arranged opposite to each other along the third direction z; the third side 327 of the welding part 321 in this example can include two perpendicularly 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 similarities between the electromagnetic device 100 in this example and the Figure 1 previous example can be referred to each other, and will not be elaborated here.

[0088] The above are only some embodiments of the present application, and do not limit the patent scope of the present application accordingly. For those of ordinary skill in the art, any equivalent structural transformation made by using the content of this specification and the drawings is equally 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. Additionally, the singular forms "a", "an", and "the" are intended to also include the plural forms. The terms "or" and "and / or" are to be interpreted inclusively, or mean any one or any combination. An exception to this definition will occur only when the combination of elements, functions, steps, or operations are inherently mutually exclusive in some manner.

Claims

1. An electromagnetic device that takes into account both voltage resistance and welding strength, characterized in that, Comprising: A magnet, including a magnetic cover plate and a magnetic core. The magnetic core includes a magnetic column and two magnetic walls oppositely arranged at both ends of the magnetic column along a first direction. The first side of the magnetic wall is connected to the magnetic cover plate. The second side of the magnetic wall is oppositely arranged to the first side along a second direction and is perpendicular to the third side. A plurality of first bosses and second bosses are arranged on the second side. A wire groove is formed between adjacent first bosses. At least one second boss is arranged in one of the wire grooves. The height of the first boss is greater than the height of the second boss. A plurality of end electrodes, bonded to the corresponding magnetic walls. The end electrode includes 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 tabletop of the first boss. The side electrode is bonded to the third side of the magnetic wall. A winding, wound around the magnetic column and located between the two magnetic walls. The lead of the winding extends to the third side of the magnetic wall through the wire groove and is welded to the side electrode. Among them, two leads with a crossing 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 it satisfies: 0.5* ≤H≤3.0* , where the is the wire diameter of the lead wire.

3. The electromagnetic device according to claim 1, wherein A third boss is arranged on the second side. A third boss is also arranged in the wire groove. The second boss is located between the first boss and the third boss. The third boss is arranged between the two leads with a crossing point and is located after the crossing point along the extending direction of the leads. The height of the third boss is greater than the height of the second boss. The height of the third boss is less than the height of the first boss.

4. The electromagnetic device according to claim 3, wherein, The two side edges of the third boss facing the two leads are respectively parallel to the corresponding leads; and / or, the side edge of the second boss facing the lead is parallel to the corresponding lead.

5. The electromagnetic device according to claim 3, characterized in that, A fourth boss is further arranged on the second side. The fourth boss and the second boss are respectively arranged on both sides of the third boss. The fourth boss is located between the two leads. The corresponding side edges of the fourth boss and the third boss are arranged oppositely to enable the other one of the two leads to pass through.

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

7. The electromagnetic device according to claim 3, wherein A rib protruding away from the magnetic column is arranged on the third side of the magnetic wall. One end of the rib is connected to the magnetic cover plate. The other end of the rib extends along the second direction to the third boss. A recessed area is formed between the rib and the adjacent end electrode. The lead extends to the welding surface of the side electrode through the recessed area and is welded by solder.

8. The electromagnetic device according to claim 7, wherein The solder wraps the end of the lead and is lower than or flush with the rib. The end of the lead is not deformed.

9. The electromagnetic device according to claim 8, wherein The side electrode includes a welding part and a main body part arranged along the second direction. The lead extends to the welding part and is welded to the welding part. The solder is located in the area where the welding part is located. The welding surface of the welding part is sunken below the rib, and / or, one end of the main body part connected to the patch electrode protrudes from the rib.

10. The electromagnetic device according to claim 9, 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, 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 any one of the welding portion and the main body portion; The first side of the main body portion is adjacent to the lead; the welding portion is welded to a plurality of leads of the electromagnetic device, and the first side of the main body portion is parallel to the nearest lead; alternatively, the welding portion is welded to one lead of the electromagnetic device, and the first side of the main body portion is parallel to the lead.

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