Multi-circuit inductive device and electronic apparatus

Abstract

The application relates to the technical field of inductor devices, and discloses a multi-loop inductor device and an electronic device. The multi-loop inductor device comprises a magnetic core, a coil, a terminal pin, and the like. The coil is arranged in the magnetic core, and the coil comprises oppositely-arranged sections, at least one connecting section arranged between the oppositely-arranged sections and connected to the oppositely-arranged sections, and the connecting section is arranged at a non-center position of the oppositely-arranged sections to provide multi-channel loop selection of the inductor device. The terminal pin is arranged at two sides of the magnetic core, two ends of the oppositely-arranged sections are integrally connected to the terminal pin through outer walls of the magnetic core, and the terminal pin is attached to side surfaces of the magnetic core and extends to outside of end surfaces of the magnetic core. The application improves the functionality of the inductor device.

Description

Technical Field

[0001] This application relates to the field of inductor technology, specifically to a multi-loop inductor and electronic device. Background Technology

[0002] Inductors convert electrical energy into magnetic energy for storage. They have the characteristics of blocking AC and passing DC. In circuits, they play roles such as filtering, oscillation, delay, notch filtering, signal screening, noise filtering, current stabilization, and suppression of electromagnetic interference. As a basic component in circuits, they are widely used in various scenarios.

[0003] In related technologies, once a single inductor is manufactured, its current path and magnetic flux path are unique and determined, and its inductance is a fixed value. When the circuit design requires different inductance values, inductors of different specifications must be selected and soldered. This not only increases material costs and the layout space of the target, but also limits the flexibility and integration of the circuit design. Utility Model Content

[0004] In view of this, this application provides a multi-loop inductor and electronic device to solve the aforementioned technical problems.

[0005] In a first aspect, embodiments of this application disclose a multi-loop inductor device, comprising: magnetic core; A coil, the coil being placed within the magnetic core, the coil comprising spaced-apart opposing segments and at least one connecting segment located between the opposing segments and respectively connecting the opposing segments, the connection point of the connecting segment and the opposing segment being located off-center of the opposing segment, to provide multi-channel loop selection for the inductor; The terminal pins are located on both sides of the magnetic core. The two ends of the opposing section are integrally connected to the terminal pins through the outer wall of the magnetic core. The terminal pins are attached to the side of the magnetic core and extend beyond the end face of the magnetic core.

[0006] In one possible example, the coil is arranged in an 'H' shape in the vertical projection of a first direction, which is the extension direction of the upper / lower ends of the magnetic core.

[0007] In one possible example, the coil and the terminal pin are arranged in a 'Π' shape in the vertical projection of the second direction, wherein the second direction is perpendicular to the first direction.

[0008] In one possible example, the magnetic core is integrally formed, and the coil is connected seamlessly within the magnetic core.

[0009] In one possible example, the magnetic core includes a first magnet and a second magnet connected to each other, with the coil disposed between the first magnet and the second magnet.

[0010] In one possible example, the widths of adjacent opposing segments and connecting segments in the vertical projection of the end face of the magnetic core are not equal.

[0011] In one possible example, the portion of the terminal pin extending beyond the end face of the magnetic core is perpendicular to the end face of the magnetic core, and the length of the terminal pin protruding beyond the end face of the magnetic core is set to L, then 0.5mm≤L≤22mm.

[0012] In one possible example, the end of the terminal pin away from the magnetic core is provided with at least one chamfer, the chamfer of each chamfer ranges from 3° to 60°, and the height of the chamfer ranges from 0.1 mm to 3 mm.

[0013] In one possible example, a plurality of connecting segments connect adjacent opposing segments, and the connecting segments divide the space between the opposing segments into a plurality of magnetic circuit regions with unequal projected areas relative to the end face of the magnetic core.

[0014] Secondly, embodiments of this application disclose an electronic device including the multi-loop inductor device described in any of the above embodiments.

[0015] In summary, compared with the prior art, this application discloses a multi-loop inductor and electronic device. The multi-loop inductor includes a magnetic core, a coil, and terminals. The coil is placed inside the magnetic core and includes spaced-apart opposing segments and at least one connecting segment located between the opposing segments and connected to them respectively. The connection point between the connecting segment and the opposing segment is located at a non-central location of the opposing segment to provide multi-channel loop selection for the inductor. The terminals are located on both sides of the magnetic core. The two ends of the opposing segments are integrally connected to the terminals through the outer wall of the magnetic core. The terminals extend from the side of the magnetic core and protrude from the end face of the magnetic core. Thus, the functionality of the inductor is improved through the above-mentioned configuration. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the multi-loop inductor device of this application; Figure 2This is a schematic diagram of the cross-sectional structure of the multi-loop inductor device of this application; Figure 3 This is a schematic diagram of the structure of the first type of coil in this application; Figure 4 This is a perspective view of the multi-loop inductor device of this application from a top-down perspective; Figures 5a to 5e This is a schematic diagram of the loop selection for the multi-loop inductor device in this application; Figure 6 This is a schematic diagram of an assembly structure of the multi-loop inductor device of this application; Figure 7 yes Figure 6 Enlarged view of point A; Figure 8 This is an exploded view of a multi-loop inductor device according to this application; Figure 9 This is a schematic diagram of the structure of the second type of coil in this application. Detailed Implementation

[0018] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the claims.

[0019] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0020] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0021] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0022] In the description of this application, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] The technical solutions shown in this application will be described in detail below through specific embodiments. It should be noted that the order of description of the following embodiments is not intended to limit the priority of the embodiments.

[0024] Please refer to Figures 1 to 4 The multi-loop inductor of this application includes a magnetic core 1, a coil 2, and terminal pins 6.

[0025] In the specific implementation process, the coil 2 is placed inside the magnetic core 1. The coil 2 includes spaced-apart opposing segments 3 and at least one connecting segment 4 located between the opposing segments 3 and respectively connected to the opposing segments 3. Terminal pins 6 are located on both sides of the magnetic core 1. The two ends of the opposing segments 3 are integrally connected to the terminal pins 6 through the outer wall of the magnetic core 1, and the terminal pins 6 are attached to the side of the magnetic core 1 and extend beyond the end face of the magnetic core 1.

[0026] Therefore, the number of terminal pins 6 can be distributed on the magnetic core 1 in correspondence with the number of ends of the opposing section 3. Each terminal pin 6 is integrally connected to the end of the opposing section 3, that is, the terminal pin 6 can be regarded as part of the end of the opposing section 3. Thus, the coil 2 and the terminal pin 6 are an integral structure, making the connection between the terminal pin 6 and the magnetic core 1 more robust. This integrated connection method has high mechanical strength and can better withstand mechanical and thermal stresses during installation and use, thereby improving the overall reliability of the device.

[0027] In this structure, the terminal pin 6 is attached to the side of the magnetic core 1 and extends beyond the end face of the magnetic core 1. In this "side-mounted" terminal structure, the two ends of the opposing section 3 extend through the outer wall of the magnetic core 1 and are integrally connected with the terminal pin 6 on the corresponding side. Here, "through" means that the opposing section 3 is exposed from the side wall of the magnetic core 1 as a lead and is electrically connected to the terminal pin 6. After connection, the terminal pin 6 is tightly attached to the side of the magnetic core 1 and extends beyond the end face of the magnetic core 1, thereby forming an external pin that can be soldered, which facilitates quick insertion of inductor devices and receiving targets (such as PCB boards).

[0028] Therefore, the terminal pin 6 is flat against the side of the magnetic core 1 instead of being bent out from the inside. This allows the device to achieve a lower connection height in the vertical direction, making it suitable for space-constrained, thin and light electronic devices. The contact between the terminal pin 6 and the side of the magnetic core 1 can also be combined with the side of the magnetic core 1 by means of adhesive or snap-fit, forming a very stable mechanical structure. At the same time, it provides a direct and efficient outward conduction path for the heat generated by the operation of the coil 2, improving the heat dissipation capacity of the device.

[0029] Preferably, the portion of terminal pin 6 extending beyond the end face of magnetic core 1 is perpendicular to the end face of magnetic core 1. This perpendicular portion of terminal pin 6 allows the inductor to be directly plugged into the corresponding socket or pad on the receiver target, just like a connector. This provides a fast and robust connection method for circuit assembly, different from surface mount technology (SMT). Compared with SMT, which relies solely on the surface tension of solder, the plug-in connection provides stronger resistance to mechanical vibration and shock through physical insertion, resulting in a more reliable connection. At the same time, the perpendicular portion of terminal pin 6 is also suitable for crimping processes, which can be pressed into the metallized holes of the PCB to form an airtight connection, making it suitable for applications with extremely high reliability requirements.

[0030] It should be noted that, after the multi-loop inductor device of this application is inserted and connected, the terminal pin 6 part attached to the side of the magnetic core 1 constitutes a protective part on the side of the magnetic core 1 in terms of physical structure. This protective part can provide effective mechanical protection for the side of the magnetic core 1. In actual application scenarios, if other components or tools accidentally touch the side of the device during subsequent assembly or maintenance, they will first come into contact with the terminal pin 6, rather than the relatively fragile magnetic core 1 itself. This is equivalent to setting up a "protective barrier" for the side of the magnetic core 1, thereby effectively avoiding chipping or overall damage to the magnet edges and corners caused by accidental collisions or scratches, and improving the reliability of the device in the production and use process.

[0031] Preferably, the coil 2 is placed horizontally inside the magnetic core 1. Specifically, "horizontal placement" means that the extension plane of the main body of the coil 2, that is, its effective conductive circuit (composed of the opposing section 3 and the connecting section 4), is parallel to the upper / lower end face of the magnetic core 1 and is covered and encapsulated by the magnetic core 1. This makes it easier for the magnetic field lines of the device to be effectively guided and constrained by the magnetic core material, and also makes it easier for the opposing section 3 of the coil 2 to naturally extend toward the edge of the magnetic core 1, thereby realizing diversified installation of the device.

[0032] It should be noted that, with Figure 1 Taking the constructed XYZ spatial coordinates as an example, the X-axis direction can be regarded as the first direction in this embodiment, that is, the extension direction of the upper / lower end of the magnetic core 1, which can also be regarded as the direction perpendicular to the upper / lower end face of the magnetic core 1. The Y-axis direction can be regarded as the second direction in this embodiment, that is, the extension direction of the front / rear side of the magnetic core 1, which can also be regarded as the direction perpendicular to the front / rear side face of the magnetic core 1. The Z-axis direction can be regarded as the third direction in this embodiment, that is, the extension direction of the left / right side of the magnetic core 1, which can also be regarded as the direction perpendicular to the left / right side face of the magnetic core 1. The first direction, the second direction, and the third direction are perpendicular to each other. Of course, the direction design in this embodiment is not limited to this. XYZ can also be any other direction that is perpendicular to each other in space in actual working requirements, which will not be elaborated here.

[0033] Based on the structural design of the terminal pin 6 being attached to the side of the magnetic core 1 and extending beyond the end face of the magnetic core 1, the coil 2 and the terminal pin 6 are arranged in a 'Π' shape in the vertical projection of the second direction. Specifically, this 'Π' shaped projection structure is clearly presented from top to bottom by the following parts: the horizontal line segment representing the opposing segment 3 located at the top of the projection, and the vertical line segment extending downward from both ends of the horizontal line segment, representing the terminal pin 6 being attached to the side of the magnetic core 1 and extending beyond the end face of the magnetic core 1.

[0034] In a preferred embodiment of this invention, the unique structure of coil 2 is designed to precisely shape the magnetic circuit inside core 1. Specifically, the connection between connecting segment 4 and opposing segment 3 is located off-center of opposing segment 3. This off-center connection design actively and purposefully breaks the symmetry of the magnetic circuit, dividing the gap region 5 formed between two adjacent opposing segments 3 into two magnetic circuit regions of different areas. This provides multi-channel loop selection for the inductor. The unequal magnetic circuit regions mean that when current flows through coil 2, by selecting different terminal pins 6 as the current input and output terminals, the current can be forced to flow through different loops constructed by opposing segment 3 and connecting segment 4. Different loops will dominantly utilize their corresponding specific volume magnetic circuit region as the main magnetic flux path, thus directly leading to different inductance values ​​ultimately exhibited by the device. Therefore, multi-channel loop selection can be provided for a single inductor, achieving the key effect of a single device having multiple different inductance values, greatly improving the device's integration and application flexibility.

[0035] Meanwhile, different terminal pin 6 selections mean that current will flow through different conductive loops constructed by the opposing segment 3 and the connecting segment 4. So when any selected loop is working, the opposing segments 3 that do not have current flowing through are not just idle. These non-current opposing segments 3 can serve as effective heat conduction paths to assist the device in heat dissipation. Specifically, the Joule heat generated in the current-carrying wires when the device is working can be transferred to these non-working opposing segments 3 through the coil itself and the surrounding magnetic core material. This significantly increases the effective heat exchange area with the internal magnetic core 1 and the external environment, thereby accelerating the rate at which the heat generated by the device is diffused to the outside.

[0036] All parts of coil 2, whether or not they participate in conduction, together form a distributed internal heat dissipation network. Combined with the large area characteristic of magnetic core 1 itself, this effectively improves the overall heat dissipation capacity of the device, thereby helping to maintain the reliability and performance stability of the device under high temperature or high current operating conditions.

[0037] Preferably, the coil 2 has a plate-shaped conductor structure design. The coil 2 can be made by stamping, etching or other precision forming processes into a flat metal plate with a specific shape, which can have a larger surface area to volume ratio and increase the contact area with the magnetic core 1. This greatly optimizes the heat conduction path. The heat generated during operation can be transferred to the magnetic core 1 and dissipated into the environment more efficiently through the entire plate surface, thereby effectively reducing the temperature rise of the device. At the same time, the flat and wide conductor structure can make more efficient use of the window area inside the magnetic core 1 and reduce leakage flux. In addition, in high-frequency applications, the plate-shaped conductor helps to reduce the negative impact of the skin effect and improve the Q value and efficiency of the device.

[0038] Preferably, the coil 2 is arranged in an 'H' shape in the vertical projection of the first direction. Specifically, the 'H' shape is composed of two parallel opposing segments 3 forming the two vertical sides of the 'H' shape, and a connecting segment 4 between them forming the middle beam of the 'H' shape. This unique 'H' shape projection structure is the core physical basis for realizing the multi-path function in this embodiment. It intuitively reveals that the current has multiple selectable flow paths inside the magnetic core 1. By selecting different endpoints (i.e. different terminal pins 6) on the 'H' shape as the input and output of the current, the current can be forced to flow through different effective conductor lengths, and the magnetic circuit regions of different volumes divided by the 'H' shape can be used dominantly, thereby ultimately obtaining multiple different inductance values ​​on a single inductor device.

[0039] Regarding the multi-channel loop selection design of this embodiment, taking the coil 2 of this application, which includes two opposing segments (3a, 3b) arranged at intervals, and a connecting segment 4 located between the two opposing segments (3a, 3b) and connected to the opposing segments (3a, 3b) respectively, as an example, the outer wall of the magnetic core 1 has four terminal pins (6a, 6b, 6c, 6d). When the inductor is connected to the pads of the PCB board 10, the inductor has at least five multi-channel loop selections, and generates different inductance values ​​accordingly. For details, please refer to... Figures 5a to 5e .

[0040] As shown in 5a, the inductor is connected to the pads 101 and 102 of the PCB board 10 through the terminals 6a and 6b at both ends of the opposed section 3a, respectively. The terminals 6c and 6d at both ends of the opposed section 3b are idle. In this state, the current path of the coil 2 of the inductor presents the first ZY direction, and thus has the first inductance. As shown in 5b, the inductor is connected to the pads 101 and 102 of the PCB board 10 through the terminal pin 6a at one end of the opposing section 3a and the terminal pin 6d at one end of the opposing section 3b, respectively. The terminal pins 6b and 6c at the other end of the opposing section 3a are idle. In this state, the current path of the inductor coil 2 presents a second ZY flow direction, and thus has a second inductance. As shown in 5c, the inductor is connected to the pads 101 and 102 of the PCB board 10 through the terminal pins 6a at one end of the opposing section 3a and 6c at one end of the opposing section 3b, respectively. The terminal pins 6b and 6d at the other end of the opposing section 3a are idle. In this state, the current path of the inductor coil 2 presents a third ZY flow direction, and thus has a third inductance. As shown in 5d, the inductor is connected to the pads 101 and 102 of the PCB board 10 through the terminal pin 6b at one end of the opposing section 3a and the terminal pin 6d at one end of the opposing section 3b, respectively. The terminal pins 6a at the other end of the opposing section 3a and the terminal pins 6c at the other end of the opposing section 3b are idle. In this state, the current path of the coil 2 of the inductor presents the fourth ZY direction, and thus has the fourth inductance. As shown in 5e, the terminal pin 6a at one end of the opposing section 3a and the terminal pin 6c at one end of the opposing section 3b of the inductor are connected to the pad 102 of the PCB board 10. The terminal pin 6b at the other end of the opposing section 3a and the terminal pin 6d at the other end of the opposing section 3b are also connected to the PCB board 102. In this state, the current path of the inductor coil 2 presents the fifth ZY flow direction, and thus has the fifth inductance.

[0041] Referring to the five multi-channel loop selection designs in the above examples, the multi-loop inductor of this application can force the current to flow through different loops constructed by opposing segments 3 and connecting segments 4 by selecting different terminal pins 6 as the current input and output terminals. Different loops will dominate the use of their corresponding specific volume magnetic circuit regions as the main magnetic flux path, which directly leads to different inductance values ​​of the device. Thus, multi-channel loop selection can be provided for a single inductor device, realizing the key effect of a device having multiple different inductance values, greatly improving the integration and application flexibility of the device.

[0042] Continue to combine Figure 4 In a key design detail of this embodiment, the projected dimensions of coil 2 and terminal pin 6 have been specifically optimized. Specifically, the widths of adjacent opposing segments 3 and connecting segments 4 in the vertical projection of the first direction are not equal. Figure 4 The design of K1, K2, and K3 is not arbitrary. Different terminal pin 6 connection methods correspond to different current paths and operating inductances. This application precisely sets the cross-sectional area of ​​each conductor segment by setting K1≠K2≠K3 (the projected width is directly related to its cross-sectional area). This allows each current path to have a current-carrying capacity that matches its expected operating inductance. For example, a larger width (cross-sectional area) can be designed for the opposing segment 3 or the connecting segment 4, which are mainly traversed by low-inductance, high-current paths, to reduce their DC resistance and ensure that they have a higher rated current. Conversely, for high-inductance paths, appropriate adjustments can be made. This ensures that the device can obtain a corresponding and appropriate rated current under multiple operating inductances, avoiding the bottleneck of the entire device performance due to insufficient current-carrying capacity of a certain path.

[0043] Meanwhile, coil 2 and magnetic core 1 are in a "competitive" relationship in terms of limited cross-sectional area. By selectively adjusting the width of each section of coil 2, rather than using a uniform width or narrowness, a more reasonable allocation of the cross-sectional area occupied by coil 2 and magnetic core can be achieved. This dynamic allocation allows sufficient magnetic circuit cross-section to be reserved in areas requiring high saturation characteristics to prevent magnetic saturation, provides sufficient conductor cross-section in areas requiring low DC resistance, and utilizes conductors as thermal bridges in areas requiring efficient heat dissipation. Ultimately, key performance indicators such as inductance, saturation current, heat dissipation efficiency, and DC resistance of the inductor are synergistically optimized to achieve the most balanced state of comprehensive performance, rather than unilaterally pursuing the extreme of a single indicator.

[0044] In a preferred embodiment of this invention, the magnetic core 1 is arranged in a rectangular structure, and the magnetic core 1 has an upper end surface 1a, a lower end surface 1b, and a side surface connecting the upper end surface 1a and the lower end surface 1b.

[0045] Furthermore, in order to optimize the magnetic circuit structure and balance the performance of the components, this embodiment precisely designs the position of the coil 2 horizontally placed in the magnetic core 1. Specifically, the vertical distance between the opposing segment 3 and the upper end face 1a of the magnetic core 1 is set as H1, and the vertical distance between the opposing segment 3 and the lower end face 1b of the magnetic core 1 is set as H2, then 0.5≤H1 / H2≤2.

[0046] Therefore, to ensure the symmetry of the magnetic circuit of the device and avoid performance deviation, when the H1 / H2 ratio deviates too much, it means that the opposing segment 3 is too close to the lower end face 1b or the upper end face 1a. This will cause a serious asymmetry in the magnetic reluctance of the upper and lower magnetic circuits. This will cause unexpected and excessive differences in key parameters such as inductance and saturation current when different circuits are selected, which is not conducive to the stability and prediction of performance. When H1 / H2 is between 0.5 and 2, it ensures that the coil 2 is located in the near-central region of the magnetic core 1, which can provide a relatively balanced magnetic flux path for the upper and lower magnetic circuits, so that the device can exhibit stable and consistent electrical performance under different installation postures and operating modes.

[0047] Furthermore, based on the constraint of 0.5≤H1 / H2≤2, the heat generated by coil 2 can be transferred almost equally to the magnetic core 1 and the external environment in both the upward and downward directions, thus optimizing the heat dissipation uniformity. At the same time, it also provides similar magnetic saturation margins for the upper and lower parts of the magnetic core 1, which together contribute to the best comprehensive balance of multiple performance indicators such as inductance accuracy, saturation current characteristics and heat dissipation efficiency of the device.

[0048] To further consolidate the above effects, preferably, the vertical distance between the opposing segment 3 and the upper end face 1a of the magnetic core 1 is set to H1, and the vertical distance between the opposing segment 3 and the lower end face 1b of the magnetic core 1 is set to H2, then 0.75≤H1 / H2≤1.

[0049] To further consolidate the above effects, optionally, the magnetic core 1 completely covers the coil 2 with a covering thickness ≥ 0.3 mm, and the covering thickness deviation of the magnetic core 1 relative to the upper / lower end face of the coil 2 is < 50%.

[0050] refer to Figure 6 Terminal pin 6 is attached to the side of magnetic core 1 and extends beyond the upper end face 1a or lower end face 1b of magnetic core 1. Taking terminal pin 6 attached to the side of magnetic core 1 and extending beyond the lower end face 1b of magnetic core 1 as an example, if the length of terminal pin 6 protruding from the end face (lower end face 1b) of magnetic core 1 is set to L, then 0.5mm≤L≤22mm.

[0051] This numerical range represents the optimal choice based on extensive engineering practice and reliability testing. When L is not less than 0.5mm, it ensures sufficient material to insert into the through-hole of PCB board 10 or form a reliable solder joint, thereby meeting the basic requirements for mechanical connection strength and electrical connection reliability. Too short an extension length may lead to insertion difficulties, poor soldering, or insufficient connection strength. Limiting the maximum length to 22mm effectively prevents the terminal pin 6 from extending excessively. An excessively long extension not only unnecessarily occupies the space below PCB board 10, affecting the layout of other components or the smooth flow of heat dissipation, but also makes it susceptible to external impacts during transportation or use due to leverage effects, causing the terminal pin 6 to bend or even be damaged, or causing additional stress to the solder joint, affecting long-term reliability.

[0052] Preferably, 1.5mm≤L≤4.5mm is used to meet the basic mechanical connection strength and electrical connection reliability requirements of terminal pin 6, and to prevent terminal pin 6 from protruding excessively.

[0053] In a preferred implementation of this embodiment, refer to... Figure 6 and Figure 7 The terminal pin 6 is provided with at least one chamfer 7 at the end away from the magnetic core 1. The chamfer 7 can be a bevel formed at the end of the terminal pin 6 by cutting or stamping. When the terminal pin 6 of the device is aligned and inserted into the mounting hole of the PCB board 10, the chamfer 7 acts as a guiding bevel, which can automatically correct small alignment deviations. Even if there is a certain misalignment between the terminal pin 6 and the mounting hole, the chamfer 7 can guide the terminal pin 6 to slide smoothly into the hole by contacting the hole opening, thereby avoiding bending, damage or insertion failure of the terminal pin caused by direct impact on the surface of the PCB board 10. This greatly reduces the assembly difficulty and improves production efficiency, and is particularly suitable for automated assembly processes.

[0054] Optionally, chamfered portions 7 are arranged on the four sides of the end of the terminal pin 6 so that the end of the terminal pin 6 has a frustum structure. Thus, the end of the terminal pin 6 appears as a tapered slope when viewed from any direction. This allows it to be aligned without a specific direction during insertion. No matter which horizontal direction there is a misalignment with the PCB board 10, the slope of the frustum structure can effectively guide and correct the misalignment, achieving "omnidirectional" or "stepless" insertion convenience.

[0055] In one example, this embodiment optimizes the key dimensional parameters of the chamfered portion 7 to achieve an optimal balance between ease of insertion, terminal strength, and current carrying capacity. Specifically, the chamfer range of each chamfered portion 7 ( Figure 7 The marking Q) includes a range of 3° to 60°, and the height range of the chamfered portion 7 ( Figure 7 The marking G) includes 0.1mm to 3mm.

[0056] Based on this design, it can be ensured that the chamfered bevel surface of the chamfered part 7 has a sufficient slope to generate an effective guiding force. If the angle is too small (e.g., less than 3°), the bevel surface is too gentle, the guiding effect is weak, and it is difficult to effectively correct large alignment deviations and ensure the smoothness of the guiding process. If the angle is too large (e.g., more than 60°), the bevel surface is too steep, close to a right angle, its guiding effect is weakened, and a large radial impact force may be generated at the moment of insertion, which is not conducive to smooth insertion. At the same time, it can ensure the reliability of the chamfered part 7 and withstand the wear of multiple insertion operations. Too small a chamfer height (such as less than 0.1mm) is difficult to control stably in the process and is very easy to be worn and lose its function during processing or use. The height range within 3mm ensures the effective guiding length of the terminal pin 6 while avoiding excessive cutting of the effective conductive cross-sectional area at the end of the terminal pin 6, thereby ensuring that the mechanical strength and current carrying capacity of the end of the terminal pin 6 are not affected.

[0057] To further enhance the above effects, the chamfer range of each chamfered part 7 includes 5° to 30°.

[0058] To further enhance the above effect, the height of each chamfered part 7 ranges from 0.2mm to 0.8mm.

[0059] In one example, the magnetic core 1 is integrally formed, and the coil 2 is seamlessly connected inside the magnetic core 1. Specifically, the magnetic core 1 is integrally formed by pressing soft magnetic powder and colloid in one step. During this process, the pre-bent coil 2 is precisely positioned and fixed in the mold. Then, the soft magnetic powder and colloid fill and wrap around it under high pressure and solidify to form a dense magnetic core structure. Thus, the coil 2 is completely and seamlessly embedded inside the magnetic core 1, so there are no cavities or loose interfaces between the coil 2 and the magnetic core 1. This makes the two a solid whole, which can effectively resist mechanical vibration and impact, as well as thermal stress caused by temperature cycling, greatly improving the structural integrity and long service life of the device.

[0060] Furthermore, the tight, gapless contact allows the heat generated by the coil 2 during operation to be efficiently conducted to the entire magnetic core 1 through the huge contact area, and then dissipated into the environment through the surface of the magnetic core 1, thereby significantly improving the heat dissipation capacity of the device and helping to maintain its stable electrical performance under high loads.

[0061] Furthermore, the integrally formed magnetic core 1 ensures the uniformity and consistency of the magnetic circuit structure, avoiding changes in magnetic reluctance or local magnetic saturation caused by internal gaps. This results in higher accuracy and batch consistency for key parameters such as inductance and saturation current of the device. The seamless connection of the coil 2 within the magnetic core 1 means that the conductor is embedded in a completely dense magnetic material environment. This eliminates the air gap between the coil 2 and the magnetic core 1, allowing magnetic lines of force to pass through the low magnetic reluctance magnetic core material without obstruction and tightly wrap around the conductor, avoiding leakage magnetic defects.

[0062] In one example, the multi-loop inductor uses a split core structure for easy assembly, see reference. Figure 8 The magnetic core 1 includes a first magnet 11 and a second magnet 12 that are connected to each other, and the coil 2 is disposed between the first magnet 11 and the second magnet 12.

[0063] That is, the pre-formed coil 2 is positioned and placed in a preset position on the first magnet 11 or the second magnet 12, and then another magnet is aligned with it and hot-pressed, so that the coil 2 is embedded between the first magnet 11 and the second magnet 12 without gaps.

[0064] Optionally, when the coil 2 is placed at a preset position of the first magnet 11 or the second magnet 12, in order to facilitate preliminary assembly and positioning, the coil 2 can temporarily maintain a certain initial gap with the preset position of the first magnet 11 or the second magnet 12. Taking the coil 2 placed at a preset position of the first magnet 11 as an example, the first magnet 11 and the coil 2 on it can be preheated and pressed before the first magnet 11 and the second magnet 12 are combined and hot-pressed. By applying appropriate temperature and pressure, the magnetic material on the surface or the whole of the first magnet 11 will undergo slight softening and plastic flow, thereby filling and completely fusing the initial gap between the first magnet 11 and the coil 2. The temperature of the preheating and pressing can include 180±15°, and is preferably 175°.

[0065] Therefore, the split-press structure design allows the complex coil 2 to be pre-placed on a magnet before hot pressing, which simplifies the manufacturing process. After hot pressing, the contact interface between the first magnet 11 and the second magnet 12 can form a dense connection through the plastic deformation of the soft magnetic material itself or the adhesive bonding. This allows the coil 2 to be firmly clamped and wrapped inside the magnetic core 1, realizing a gapless connection between the coil 2 and the magnetic core 1. This tight wrapping ensures that the device has extremely high mechanical strength and can effectively conduct working heat and optimize heat dissipation.

[0066] Despite being a split structure, the two magnets can be tightly fitted together by hot pressing, which minimizes the high magnetic resistance points in the magnetic circuit caused by assembly gaps. This allows the magnetic lines of force to remain closed in a nearly complete low magnetic resistance path, significantly suppressing magnetic leakage and ensuring the stability and consistency of the device's inductance.

[0067] Optionally, in another means of enhancing the mechanical strength and long-term reliability of the first magnet 11 and the second magnet 12 after they are combined, the first magnet 11 and the second magnet 12 can also be fixed by adhesive bonding. That is, an adhesive layer can be pre-coated or applied to the joint surface of the first magnet 11 and / or the second magnet 12, or an adhesive layer can also be applied or applied to a portion of the coil 2, and then the first magnet 11 and the second magnet 12 can be bonded together to ensure that the device has extremely high mechanical strength and high assembly efficiency.

[0068] refer to Figure 9 In the more complex configuration of this embodiment, the design of the magnetic circuit can have greater flexibility and precision. Specifically, multiple connecting segments 4 connect adjacent opposing segments 3, and the connecting segments 4 divide the interval region 5 between opposing segments 3 into multiple magnetic circuit regions with different projected areas relative to the end face of the magnetic core 1, thereby realizing fine division of the magnetic circuit and multiple inductance selection.

[0069] Understandably, a single connecting segment 4 divides the interval region 5 between two opposing segments 3 into two magnetic circuit regions, while multiple connecting segments 4 divide the interval region 5 into three or more sub-magnetic circuit regions of different volumes and shapes at different connection point positions. When current flows through different connecting segments 4, the dominant magnetic flux path it excites will traverse these different combinations of sub-magnetic circuit regions. Since the magnetoresistance characteristics of each sub-magnetic circuit region are different, this allows a single device to provide more and more finely differentiated inductance values, thereby greatly expanding the channel selection range and application scenarios of the device.

[0070] This application also discloses an electronic device, including a multi-loop inductor as described in any of the above embodiments. For other working principles and processes of the electronic device in this embodiment, please refer to the description of the multi-loop inductor in this embodiment, which will not be repeated here.

[0071] The multi-loop inductor and electronic device provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. It should be noted that the descriptions of each embodiment in this application have different emphases. Parts not described in detail or in a certain embodiment can be referred to the relevant descriptions of other embodiments.

[0072] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. The technical features of the technical solution of this application can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are also included within the patent protection scope of this application, as long as the combination of these technical features does not contradict each other.

Claims

1. A multi-loop inductor device, characterized in that, include: magnetic core; A coil, the coil being placed within the magnetic core, the coil comprising spaced-apart opposing segments and at least one connecting segment located between the opposing segments and respectively connecting the opposing segments, the connection point of the connecting segment and the opposing segment being located off-center of the opposing segment, to provide multi-channel loop selection for the inductor; The terminal pins are located on both sides of the magnetic core. The two ends of the opposing section are integrally connected to the terminal pins through the outer wall of the magnetic core. The terminal pins are attached to the side of the magnetic core and extend beyond the end face of the magnetic core.

2. The multi-loop inductor device as described in claim 1, characterized in that, The coil is arranged in an 'H' shape in the vertical projection of the first direction, which is the extension direction of the upper / lower ends of the magnetic core.

3. The multi-loop inductor device as described in claim 2, characterized in that, The coil and the terminal pin are arranged in a 'Π' shape in the vertical projection of the second direction, wherein the second direction is perpendicular to the first direction.

4. The multi-loop inductor device as described in claim 1, characterized in that, The magnetic core is integrally formed, and the coil is connected seamlessly within the magnetic core.

5. The multi-loop inductor device as described in claim 1, characterized in that, The magnetic core includes a first magnet and a second magnet connected to each other, and the coil is disposed between the first magnet and the second magnet.

6. The multi-loop inductor device as described in claim 1, characterized in that, The widths of adjacent opposing segments and connecting segments in the vertical projection of the end face of the magnetic core are not equal.

7. The multi-loop inductor device as described in claim 1, characterized in that, The portion of the terminal pin extending beyond the end face of the magnetic core is perpendicular to the end face of the magnetic core, and the length of the terminal pin protruding beyond the end face of the magnetic core is set to L, then 0.5mm≤L≤22mm.

8. The multi-loop inductor device as described in claim 1, characterized in that, The terminal pin has at least one chamfer at the end away from the magnetic core. The chamfer angle of each chamfer ranges from 3° to 60°, and the height of the chamfer ranges from 0.1 mm to 3 mm.

9. The multi-loop inductor device as described in claim 1, characterized in that, Multiple connecting segments connect adjacent opposing segments, and the connecting segments divide the interval between the opposing segments into multiple magnetic circuit regions with unequal projected areas relative to the end face of the magnetic core.

10. An electronic device, characterized in that, Including the multi-loop inductor as described in any one of claims 1 to 9.

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