A magnetic device

Abstract

The application provides a magnetic device, which comprises a magnetic body, a winding arranged in the magnetic body and wound by a long strip-shaped flat wire, two end portions of the winding extending to outside of the magnetic body through a first side surface of the magnetic body and adhering to the first side surface of the magnetic body, and two patch terminals oppositely arranged and adhering to a second side surface and a third side surface of the magnetic body, respectively, wherein a single patch terminal also adheres to a bottom surface and the first side surface of the magnetic body and is electrically connected to a corresponding end portion of the winding on the first side surface, and the first side surface, the second side surface and the third side surface are sequentially connected and all perpendicularly connected to the bottom surface. Based on the application, the vertical AOI detection and judgment are facilitated, the terminals can surround the magnetic body to a large extent, the good anti-vibration and impact resistance performance and the good electromagnetic shielding performance are realized.

Description

Technical Field

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

[0002] With the rapid development of technology, especially the emergence of multifunctional devices, the demand for passive components is increasing, and magnetic components, as one type of passive element, have been widely used. Magnetic components mainly consist of a magnetic body, windings, and terminals (also known as "external terminals" or "external electrodes"). The terminals primarily serve two functions: first, to electrically connect to the leads of the windings; and second, to electrically connect to a circuit board (e.g., a PCB, or Printed Circuit Board) using SMT (Surface Mount Technology). Currently, there are two main types of magnetic components. The first type uses flat wire for windings, and the terminals are electrodes located only on the bottom surface of the magnetic body (also known as "bottom electrodes"). The second type uses round enameled wire for windings, and the terminals extend from the side of the magnetic body and are bent and attached to the bottom surface.

[0003] Achieving high-quality solder joints through surface mount technology (SMT) is crucial for the performance and reliability of electronic products. Currently, vertical AOI (Automated Optical Inspection) technology is commonly used to check for solder joint defects. The principle is to acquire and analyze images of the inspection location using optical technology when viewing the magnetic device from a line of sight parallel to its side (i.e., vertically downwards). However, in the first type of magnetic device, the terminals are only located on the bottom surface of the magnetic body. After SMT electrical connection is performed between the magnetic device and the circuit board, the solder between the terminals and the circuit board (referred to as "SMT solder") is located at the bottom of the magnetic device. This makes it difficult to acquire satisfactory SMT solder images using vertical AOI technology, hindering vertical AOI inspection and judgment. Furthermore, since the terminals are formed through electroplating, the SMT electrical connection is relatively weak, resulting in poor vibration and shock resistance. Although the terminals of the second type of magnetic device have a larger contact area with the magnetic body, improving vibration and impact resistance, the terminals need to extend into the interior of the magnetic body to be soldered to the enameled wire to achieve electrical connection. This restricts the internal utilization of the magnetic device and affects the design for maximizing electrical performance. In addition, to ensure the stability of the electrical connection between the terminal and the enameled wire, the terminal is thicker. After the magnetic device is connected to the circuit board via SMT, most of the SMT solder is located at the bottom of the magnetic device and at the large outer radius formed by the bend of the terminal, making it difficult to overflow. Ultimately, it will be blocked by the magnetic device, which will also make it difficult to acquire the required SMT solder image when using vertical AOI technology, which is also not conducive to vertical AOI inspection and judgment.

[0004] It is evident that while existing magnetic devices are beneficial for vertical AOI detection and judgment, they struggle to simultaneously provide good vibration and shock resistance. Utility Model Content

[0005] In view of this, this application provides a magnetic device that is not only beneficial for detection and judgment in vertical AOI, but also allows the terminals to surround the magnetic body to a greater extent, achieving good vibration resistance and impact resistance.

[0006] This application provides a magnetic device comprising: magnetic body; The winding is disposed within the magnetic body and is formed by winding a long strip of flat wire. The two ends of the winding extend beyond the first side of the magnetic body and are attached to the first side of the magnetic body. Two surface mount terminals are disposed opposite to each other and respectively attached to the second and third sides of the magnetic body. Each surface mount terminal is also attached to at least the bottom surface and the first side surface of the magnetic body, and is electrically connected to one end of the winding on the first side surface. The first side surface, the second side surface, and the third side surface are connected in sequence and are all perpendicular to the bottom surface.

[0007] Optionally, the patch terminal further extends and adheres to the top surface of the magnetic body, the top surface being disposed opposite to the bottom surface, and the first side surface, the second side surface, and the third side surface being perpendicularly connected between the top surface and the bottom surface, respectively.

[0008] Optionally, the top surface of the magnetic body is provided with a recessed area, and the portion of the patch terminal extending to the top surface is located in the recessed area and is disposed adjacent to the three sides of the recessed area. Alternatively, the top surface of the magnetic body is provided with a first protrusion, which is located between the portions of the two patch terminals extending to the top surface.

[0009] Optionally, the coverage area of ​​a single patch terminal on the second or third side is S1, and the area of ​​the second or third side is S0, satisfying 30%*S0≤S1≤100%*S0.

[0010] Optionally, one end of the winding extends beyond the first side surface and bends toward the bottom surface of the magnetic body before fitting against the first side surface of the magnetic body. The other end of the winding extends beyond the first side surface and bends toward the top surface of the magnetic body before fitting against the first side surface of the magnetic body.

[0011] Optionally, the two ends of the winding extend beyond the first side surface and are bent toward the top surface of the magnetic body before fitting against the first side surface of the magnetic body. Alternatively, the two ends of the winding extend beyond the first side surface and are bent toward the bottom surface of the magnetic body before fitting against the first side surface of the magnetic body.

[0012] Optionally, the two ends of the winding include a first exposed portion and a second exposed portion exposed on the first side, the length of either the first exposed portion or the second exposed portion is L, and L≥D, where D is the width of the flat wire.

[0013] Optionally, the first exposed portion and the second exposed portion are disposed opposite to each other and aligned on the first side.

[0014] Optionally, a second protrusion is provided on the first side of the magnetic body, and the second protrusion is located between the first exposed portion and the second exposed portion.

[0015] Optionally, on a first side of the magnetic body, the patch terminal is welded to one end of the winding.

[0016] Optionally, the magnetic device further includes an adhesive layer, through which the patch terminal is attached to at least the second or third side of the magnetic body.

[0017] Optionally, the adhesive layer includes any one of epoxy resin, phenolic resin, polyurethane resin, and cyanate ester.

[0018] Optionally, the magnetic body is a one-piece molded part.

[0019] As described above, in the magnetic device of this application, the winding is formed by winding a long strip of flat wire, and both ends extend beyond the first side of the magnetic body and are attached to the first side of the magnetic body. Each surface mount terminal is attached to at least the bottom surface, the first side surface, and the second side surface of the magnetic body. The contact area between the surface mount terminal and the magnetic body is large, which can form a good enclosure of the magnetic body, thereby achieving good vibration and shock resistance performance. At the same time, it has good electromagnetic shielding performance, avoiding the electromagnetic influence of external electromagnetic waves on the inside of the magnetic device or the electromagnetic influence of the electromagnetic waves inside the magnetic device on the outside (such as electronic components adjacent to the magnetic device). Furthermore, the surface mount terminal and the end of the winding are electrically connected by attachment, and the electrical connection stability is good. The thickness of the surface mount terminal can be thinner, and the outer radius formed by bending towards the bottom surface of the magnetic body is small. SMT solder is easy to overflow the outer radius, and it is easy to acquire the required SMT solder image when using vertical AOI technology, which is beneficial to the detection and judgment of vertical AOI.

[0020] In addition, the surface mount terminals do not need to extend into the interior of the magnetic body. They can be electrically connected to the two ends of the winding outside the magnetic body (i.e. outside the first side), thereby maximizing the utilization of the interior of the magnetic device and thus facilitating the design of maximizing the electrical performance of the magnetic device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the first magnetic device provided in the embodiments of this application; Figure 2 yes Figure 1 The diagram shown illustrates the structure of the magnetic device without the two surface-mount terminals. Figure 3 yes Figure 1 A schematic diagram of the magnetic device shown from another perspective; Figure 4 yes Figure 1 A schematic diagram of the structure in the magnetic device shown, in which the winding is electrically connected to two surface-mount terminals; Figure 5 yes Figure 3 The diagram shows the structure of the winding. Figure 6 This is a schematic diagram of the structure of the second type of magnetic device provided in the embodiments of this application; Figure 7 This is a schematic diagram of another winding structure provided in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the third type of magnetic device provided in the embodiments of this application; Figure 9 This is a schematic diagram of the structure of the fourth type of magnetic device provided in the embodiments of this application.

[0022] First direction x, second direction y, third direction Z; Magnetic device 100, first protrusion / protrusion 101, second protrusion / protrusion 102, recessed area 103; Magnetic body 1, first side 11, second side 12, third side 13, fourth side 14, top surface 15, bottom surface 16, welding part 10, welding point 10a; Winding 2, first exposed part 201, second exposed part 202, bending line L0; Surface mount terminal 3, adhesive layer 30, first part 31, second part 32, third part 33, fourth part 34. Detailed Implementation

[0023] To address the aforementioned technical problems in the prior art, the magnetic device provided in this application comprises a winding made of a long strip of flat wire, with both ends extending beyond the first side of the magnetic body and attached to it. Each patch terminal is attached to at least the bottom surface, the first side surface, and the second side surface of the magnetic body. The patch terminal has a large contact area with the magnetic body, which can form a good enclosure of the magnetic body, thereby achieving good vibration and impact resistance, good electromagnetic shielding performance, and is beneficial for vertical AOI detection and judgment.

[0024] The specific form of the shape, quantity, size, and other parameters of any of the windings, surface mount terminals, etc., can be determined according to the adaptability required by the actual scenario, and this application does not limit it.

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly described below in conjunction with specific embodiments and corresponding drawings. Obviously, the embodiments described below are only a part of the embodiments of this application, and not all of them. Unless otherwise specified, the following embodiments and their technical features can be combined with each other, and also belong to the technical solutions of this application.

[0026] In the description of the embodiments of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solutions of the corresponding embodiments, and are not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application.

[0027] Please combine them together Figures 1 to 5 As shown, a magnetic device 100 provided in this application embodiment includes a magnetic body 1, a winding 2, and two surface mount terminals 3.

[0028] The magnetic body 1 can be integrally formed from magnetic powder using a predetermined process, meaning the magnetic body 1 is a one-piece molded part. The specific composition of the magnetic powder can be a soft magnetic material from the prior art, and the predetermined process can be a hot-pressing process. The magnetic body 1 can be a rectangular magnetic structure, and thus, the magnetic body 1 can include six surfaces: a first side surface 11, a second side surface 12, a third side surface 13, a fourth side surface 14, a top surface 15, and a bottom surface 16. The second side surface 12, the fourth side surface 14, and the bottom surface 16 are constrained by… Figure 1 and Figure 2 The placement orientation shown is not displayed, but... Figure 3 As shown in the diagram, the first side 11, the second side 12, the third side 13, and the fourth side 14 are connected sequentially and are all perpendicularly connected to the bottom surface 16 and the top surface 15. That is to say, in... Figures 1 to 3 In the orientation shown, the first side surface 11 and the fourth side surface 14 are positioned opposite each other along the third direction z, the second side surface 12 and the third side surface 13 are positioned opposite each other along the first direction x, and the bottom surface 16 and the top surface 15 are positioned opposite each other along the second direction y. The surface of the magnetic body 1 may or may not be covered with an insulating layer. The magnetic body 1 illustrated in this application is merely an example and may also be of other shapes.

[0029] For ease of description and understanding, combined with Figures 1 to 5 The orientations shown are illustrated using the magnetic body 1, which is generally rectangular, as an example. Here, the width direction of the magnetic device 100 is referred to as the first direction x, the height direction as the second direction y, and the thickness direction as the third direction z. The first direction x, the second direction y, and the third direction z are all perpendicular to each other and can be considered as the three coordinate axes of a three-dimensional Cartesian coordinate system. It should be understood that the term "perpendicular" throughout this application does not require the angle between the two directions to be 90°, but allows for deviations such as ±10°. That is, "perpendicular" can be understood as the angle between any two directions being 80° to 100°. Similarly, the term "parallel" throughout this application does not require the angle between the two directions to be 0° or 180°, but allows for deviations such as ±10°. That is, "parallel" can be understood as the angle between any two directions being 0° to 10° or 170° to 190°.

[0030] The winding 2 is disposed within the magnetic body 1 and is a wound structure; here, the winding 2 can also be referred to as coil 2. Its shape and the specific number of turns can be determined according to the adaptability of the actual scenario. Figure 4 and Figure 5 As shown, the winding 2 in this embodiment is formed by winding a long strip (or a long, flat sheet) of flat wire. The flat wire has a low DC resistance (DCR), resulting in a low impedance for the winding 2. The flat wire may include a body and an insulating outer layer covering the outer surface of the body. The body is a conductive element, and the insulating outer layer ensures electrical insulation between turns of the flat wire after winding. The winding 2 has two ends. Since the flat wire is wound turn by turn along its own thickness direction, one end extends from the bottom of the winding 2, and the other extends from the top of the winding 2. Figures 1 to 5 As shown, the two ends of the winding 2 extend beyond the first side 11 of the magnetic body 1 and are attached to the first side 11 of the magnetic body 1.

[0031] The two patch terminals 3 can have identical structures and shapes, and are arranged opposite each other along the first direction x, specifically attached to the second side 12 and the third side 13 of the magnetic body 1, respectively. Each patch terminal 3 is also attached to at least the bottom surface 16 and the first side 11 of the magnetic body 1, and is electrically connected to the end of the winding 2 on the first side 11.

[0032] Please continue reading. Figures 1 to 4 As shown, a single surface mount terminal 3 may include a first portion 31, a second portion 32, and a third portion 33. The area of ​​the first portion 31 is larger than the area of ​​either the second portion 32 or the third portion 33, and the second portion 32 and the third portion 33 can be considered as extending from the first portion 31. Wherein, for Figure 1 The first portion 31 of the patch terminal 3 located on the left side along the first direction x is attached to the second side 12 of the magnetic body 1, while the first portion 31 of the patch terminal 3 located on the right side is attached to the third side 13 of the magnetic body 1; the second portion 32 of each patch terminal 3 is attached to the first side 11 of the magnetic body 1, and the third portion 33 of each patch terminal 3 is attached to the bottom surface 16 of the magnetic body 1.

[0033] Therefore, each patch terminal 3 is attached to at least three surfaces of the magnetic body 1: the bottom surface 16, the first side surface 11, and the second side surface 12. The contact area between a single patch terminal 3 and the magnetic body 1 is relatively large, and two patch terminals 3 can form a good enclosure of the magnetic body 1 as a whole. This enables the magnetic device 100 to achieve good vibration and shock resistance, and has high reliability in environments such as vibration, drop, and mechanical impact, meeting the requirements for use in harsh environments. At the same time, it has good electromagnetic shielding performance, preventing external electromagnetic waves from affecting the electromagnetic influence inside the magnetic device 100 or preventing the electromagnetic waves inside the magnetic device 100 from affecting the external electromagnetic influence. The electromagnetic influence of the surrounding environment (e.g., electronic components adjacent to the magnetic device 100) is mitigated; furthermore, the surface mount terminal 3 and the end of the winding 2 are electrically connected by bonding, resulting in a large electrical connection area and good electrical connection stability. This allows for a thinner surface mount terminal 3 and a smaller outer radius formed by bending towards the bottom surface 16 of the magnetic body 1 (i.e., the outer radius formed by bending the first part 31 and the third part 33). When SMT is performed between the bottom surface 16 and the circuit board, SMT solder easily overflows from the outer radius. When using vertical AOI technology, it is easy to acquire SMT solder images that meet the requirements, which is beneficial for vertical AOI detection and judgment. The direction of the vertical AOI can be understood as a direction parallel to the second direction y.

[0034] like Figure 1As shown, in one example, on the first side 11 of the magnetic body 1, each patch terminal 3 is welded to one end of the winding 2 to achieve the electrical connection. The welding includes, but is not limited to, laser welding, friction welding, brazing, and tin soldering. A tin-plated welding method can form a connection such as... Figure 1 The welding portion (or solder joint) 10 shown is illustrated. When using vertical AOI technology, the detection and judgment of the solder joint 10 can be achieved by acquiring an image of the solder. It should be understood that the shapes of the welding portions 10 in the various embodiments of this application are merely illustrative examples; the shapes of the welding portions 10 in other examples may vary depending on the welding method, for example, see [reference needed]. Figure 6 As shown, the welded part 10 formed by laser welding can be represented by multiple welding points 10a, and the number of welding points 10a is not limited to that shown in the figure.

[0035] In addition, none of the patch terminals 3 need to extend into the interior of the magnetic body 1, but can be electrically connected to the two ends of the winding 2 outside the magnetic body 1 (i.e. outside the first side 11), so that the interior of the magnetic device 100 can be maximized. For example, the radial dimension of the winding 2 can be larger, which is beneficial to the design of maximizing the electrical performance of the magnetic device 100.

[0036] In each of the patch terminals 3 in this application, the coverage area of ​​a single patch terminal 3 on the second side 12 or the third side 13 can be equal and both are S1. The area of ​​the second side 12 or the third side 13 is S0, and satisfies 30%*S0≤S1≤100%*S0. This allows the maximum contact area between the maximum part of a single patch terminal 3 and the magnetic body 1 to be larger, forming a better enclosure of the magnetic body 1, thereby further ensuring good vibration and impact resistance as well as electromagnetic shielding performance.

[0037] In one example, combining Figure 2 As shown, the magnetic device 100 further includes an adhesive layer 30, through which the first portion 31 of a single patch terminal 3 is bonded to the second side 12 or the third side 13 of the magnetic body 1, thereby ensuring a tight enclosure between the patch terminal 3 and the magnetic body 1. Optionally, the adhesive layer 30 includes any one of epoxy resin, phenolic resin, polyurethane resin, and cyanate ester.

[0038] In one example, please refer to [link / reference]. Figures 1 to 4As shown, a single patch terminal 3 may further include a fourth portion 34, which extends from the first portion 31 and is attached to the top surface 15 of the magnetic body 1. Thus, any patch terminal 3 of this application extends and is attached to the top surface 15 of the magnetic body 1, meaning any patch terminal 3 is attached to all four surfaces of the magnetic body 1. This results in a larger contact area between a single patch terminal 3 and the magnetic body 1, and two patch terminals 3 together provide better enclosure of the magnetic body 1, leading to better vibration and impact resistance, as well as better electromagnetic shielding performance.

[0039] like Figure 4 and Figure 5 As shown, in one example, one end of the winding 2 extends beyond the first side surface 11 of the magnetic body 1 and bends towards the bottom surface 16 of the magnetic body 1 (i.e., bends in the opposite direction of the second direction y) before fitting against the first side surface 11 of the magnetic body 1; the other end of the winding 2 extends beyond the first side surface 11 and bends towards the top surface 15 of the magnetic body 1 (i.e., bends in the second direction y) before fitting against the first side surface 11 of the magnetic body 1. It can be seen that the two ends of the winding 2 bend in opposite directions after extending beyond the first side surface 11. For the winding 2 formed by winding flat wire turn by turn, the two ends are located above and below the winding 2, respectively. This bending and fitting method utilizes the plane corresponding to the flat wire for bending, and the bending direction is perpendicular to the plane direction of the flat wire, which meets the requirement of easy material forming and easy bending. Furthermore, the flat wire is led out from the same side of the magnetic body 1, which reduces the required lead-out length compared to windings formed by enameled wire.

[0040] Combination Figure 7 As shown, in another example, the two ends of the winding 2 extend beyond the first side surface 11 of the magnetic body 1 and are both bent toward the top surface 15 of the magnetic body 1, thus fitting against the first side surface 11 of the magnetic body 1. Of course, in other examples, the two ends of the winding 2 extend beyond the first side surface 11 and are both bent toward the bottom surface 16 of the magnetic body 1, thus fitting against the first side surface 11 of the magnetic body 1. This method facilitates that the two ends are located on the same plane after bending, for example... Figure 7 As shown, the last bend line L0 at both ends is on the same horizontal line, which facilitates the alignment of the parts of both ends exposed outside the first side 11.

[0041] The two ends of the winding 2 include a first exposed portion 201 and a second exposed portion 202 exposed on the first side surface 11, combined with Figure 5As shown, the length (i.e., the length along the second direction y) of either the first exposed portion 201 or the second exposed portion 202 is L, and L≥D, where D is the width of the flat wire. This ensures that the first exposed portion 201 and the second exposed portion 202 each have a large area, resulting in good electrical connection performance between each patch terminal 3 and each end of the winding 2.

[0042] In a real-world scenario, the first exposed portion 201 and the second exposed portion 202 can be disposed opposite to each other and aligned along the first direction x on the first side surface 11 of the magnetic body 1, which facilitates the soldering of the first exposed portion 201 and the second exposed portion 202 to the corresponding patch terminals 3, respectively.

[0043] In one example, the first side 11 of the magnetic body 1 may be provided with a protrusion 102. The protrusion 102 extends along the second direction y and is located between the first exposed portion 201 and the second exposed portion 202. This can prevent the first exposed portion 201 and the second exposed portion 202 from contacting each other due to deformation caused by hot pressing when the magnetic body 1 is hot-pressed. Furthermore, when the patch terminal 3 is electrically connected to the corresponding exposed portion, the limiting effect of the protrusion 102 makes it easier for the operator to attach the patch terminal 3 to each surface of the magnetic body 1.

[0044] Similarly, such as Figure 1 and Figure 2 As shown, the top surface 15 of the magnetic body 1 may also be provided with a protrusion 101, which extends along a third direction z. To distinguish it from the aforementioned protrusion, this protrusion 101 can be called the first protrusion 101, and the aforementioned protrusion 102 can be correspondingly called the second protrusion 102. The first protrusion 101 is located between the portions of the two patch terminals 3 extending to the top surface 15, that is, between the fourth portions 34 of the two patch terminals 3. Through the limiting effect of the first protrusion 101, the operator can more easily attach the patch terminals 3 to the various surfaces of the magnetic body 1, without significantly increasing the processing difficulty and cost of the mold for manufacturing the magnetic body 1.

[0045] In one example, the height of the first protrusion 101 may be equal to the thickness of the fourth portion 34, so that after the patch terminal 3 is assembled with the magnetic body 1, the fourth portion 34 is flush with the first protrusion 101, thereby improving the surface flatness of the entire magnetic device 100.

[0046] In other examples, such as Figure 8As shown, the top surface 15 of the magnetic body 1 may not have the first protrusion 101, but instead has two recessed areas 103. The portion of each patch terminal 3 extending to the top surface 15 (i.e., the fourth portion 34) is located within the corresponding recessed area 103 and is adjacent to the three sides of the recessed area 103. That is, this example provides the limiting function through the recessed areas 103.

[0047] Furthermore, the depth of the recessed area 103 can be equal to the thickness of the fourth part 34, so that the fourth part 34 is flush with the top surface 15, thereby improving the surface flatness of the entire magnetic device 100.

[0048] Of course, such as Figure 9 As shown, in another embodiment of this application, the top surface 15 of the magnetic body 1 may not have the first protrusion 101 or the recessed area 103, but may instead be a flat surface, and the respective patch terminals 3 may not have the fourth portion 34. Alternatively, each patch terminal 3 may have the fourth portion 34, and the fourth portion 34 may be directly attached to the flat surface. This example can significantly reduce the processing difficulty and cost of the mold for manufacturing the magnetic body 1.

[0049] In the foregoing Figure 1 , Figure 6 and Figure 8 In any of the examples shown, for any surface mount terminal 3, the fourth part 34 and the third part 33 can be completely identical, that is, any surface mount terminal 3 can be symmetrically arranged along the xz cross section; in addition, the way the fourth part 34 mates with the top surface 15 and the way the third part 33 mates with the bottom surface 16 can be completely identical or different, for example... Figure 3 The bottom surface 16 of the magnetic body 1 shown may be provided with two recessed areas 103 that are arranged opposite each other along the first direction x. Figure 8 The bottom surface 16 of the magnetic body 1 shown may also be provided with two of the aforementioned recessed areas 103.

[0050] certainly, Figure 9 The bottom surface 16 of the magnetic body 1 shown may also be provided with two recessed areas 103, or with a first protrusion 101 as described above.

[0051] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. For those skilled in the art, any equivalent structural transformations made using the content of this specification and drawings are similarly included within the patent protection scope of this application.

[0052] Although this document uses terms such as "first," "second," etc., to describe various types of information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. Furthermore, the singular forms "a," "an," and "the" are intended to also include the plural forms. The terms "or" and "and / or" are interpreted as inclusive, or meaning either one or any combination thereof. Exceptions to this definition only arise when combinations of elements, functions, steps, or operations are inherently mutually exclusive in some way.

Claims

1. A magnetic device, characterized in that, include: magnetic body; The winding is disposed within the magnetic body and is formed by winding a long strip of flat wire. The two ends of the winding extend beyond the first side of the magnetic body and are attached to the first side of the magnetic body. Two surface mount terminals are disposed opposite to each other and respectively attached to the second and third sides of the magnetic body. Each surface mount terminal is also attached to at least the bottom surface and the first side surface of the magnetic body, and is electrically connected to one end of the winding on the first side surface. The first side surface, the second side surface, and the third side surface are connected in sequence and are all perpendicular to the bottom surface.

2. The magnetic device according to claim 1, characterized in that, The patch terminal also extends and adheres to the top surface of the magnetic body, the top surface being disposed opposite to the bottom surface, and the first side surface, the second side surface, and the third side surface being perpendicularly connected between the top surface and the bottom surface, respectively.

3. The magnetic device according to claim 2, characterized in that, The top surface of the magnetic body is provided with a recessed area, and the portion of the patch terminal extending to the top surface is located in the recessed area and is disposed adjacent to the three sides of the recessed area. Alternatively, the top surface of the magnetic body is provided with a first protrusion, which is located between the portions of the two patch terminals extending to the top surface.

4. The magnetic device according to claim 1, characterized in that, The coverage area of ​​a single patch terminal on the second side or the third side is S1, and the area of ​​the second side or the third side is S0, and satisfies 30%*S0≤S1≤100%*S0.

5. The magnetic device according to claim 1, characterized in that, One end of the winding extends beyond the first side surface and bends toward the bottom surface of the magnetic body before fitting against the first side surface of the magnetic body. The other end of the winding extends beyond the first side surface and bends toward the top surface of the magnetic body before fitting against the first side surface of the magnetic body.

6. The magnetic device according to claim 1, characterized in that, The two ends of the winding extend beyond the first side surface and are bent toward the top surface of the magnetic body before fitting against the first side surface of the magnetic body. Alternatively, the two ends of the winding extend beyond the first side surface and are bent toward the bottom surface of the magnetic body before fitting against the first side surface of the magnetic body.

7. The magnetic device according to claim 5 or 6, characterized in that, The two ends of the winding include a first exposed portion and a second exposed portion exposed on the first side. The length of either the first exposed portion or the second exposed portion is L, and L≥D, where D is the width of the flat wire.

8. The magnetic device according to claim 7, characterized in that, The first exposed portion and the second exposed portion are disposed opposite to each other and aligned on the first side.

9. The magnetic device according to claim 8, characterized in that, The first side of the magnetic body is provided with a second protrusion, which is located between the first exposed portion and the second exposed portion.

10. The magnetic device according to claim 1, 5, or 6, characterized in that, On a first side of the magnetic body, the patch terminal is welded to one end of the winding.

11. The magnetic device according to claim 1, characterized in that, The magnetic device further includes an adhesive layer, and the patch terminal is attached to at least the second or third side of the magnetic body through the adhesive layer.

12. The magnetic device according to claim 11, characterized in that, The adhesive layer includes any one of epoxy resin, phenolic resin, polyurethane resin, and cyanate ester.

13. The magnetic device according to claim 1, characterized in that, The magnetic body is a one-piece molded part.

Images