patch inductor

Abstract

This utility model discloses a surface mount inductor, relating to the field of inductor technology. The surface mount inductor includes a magnetic core housing, an electromagnetic component, and an adjustment hole. The magnetic core housing is a one-piece molded structure with an axially penetrating through-hole. The electromagnetic component passes through the through-hole. The adjustment hole is located on the side wall of the magnetic core housing, with its depth direction perpendicular to the axis of the through-hole. The one-piece molded magnetic core housing avoids the gap problems caused by split-type splicing and curing, resulting in a more stable overall structure. Furthermore, the adjustment hole allows for flexible adjustment of the inductance, achieving dynamic fine-tuning and overcoming the limitations of traditional surface mount inductors.

Description

Technical Field

[0001] This utility model relates to the field of inductor technology, and in particular to a surface mount inductor. Background Technology

[0002] A surface-mount inductor is a surface-mount electronic component used in circuits for energy storage, filtering, or impedance matching. It achieves electromagnetic energy conversion through the interaction between a magnetic core and a conductive coil.

[0003] Traditional surface mount inductors typically employ a two-piece, split magnetic core assembly structure. The electromagnetic components (coil and core rod) are pre-fixed to a groove in one side of the core using adhesive, and then the other core is aligned and bonded to it. Finally, the adhesive layer cures to form the integral structure. This method results in an irreversible gap after the adhesive layer cures, making dynamic fine-tuning of the inductance impossible and limiting its flexibility and applicability in some high-precision applications. Utility Model Content

[0004] The main purpose of this invention is to propose a surface mount inductor, which aims to solve the technical problem that the application of inductor structures is limited due to the use of adhesive layer curing in surface mount inductors in related technologies.

[0005] To achieve the above objectives, this utility model proposes a surface mount inductor, which includes:

[0006] The magnetic core housing is an integrally formed structure and has a through hole extending along the axial direction;

[0007] An electromagnetic component, wherein the electromagnetic component passes through the through hole;

[0008] An adjustment hole is provided on the side wall of the magnetic core housing, and the depth direction of the adjustment hole is perpendicular to the axis of the through hole.

[0009] In one embodiment, the electromagnetic component includes a coil, a core rod, and conductive terminals. The coil and the core rod are housed within the cavity of the magnetic core housing. The core rod passes through the through hole, and the coil is sleeved on the core rod. The coil has a winding segment, and both ends of the winding segment extend and connect to the conductive terminals.

[0010] In one embodiment, the sidewall of the magnetic core housing has an adjustment surface, and the adjustment surface has a plurality of adjustment holes, the depth of which is 20%-50% of the thickness of the adjustment surface.

[0011] In one embodiment, each of the adjustment holes is spaced apart along the adjustment surface.

[0012] In one embodiment, the plurality of adjustment holes are arranged in an array along the adjustment surface, and the axes of adjacent columns of adjustment holes are staggered.

[0013] In one embodiment, the electromagnetic component further includes a core rod, the diameter of which is interference-fitted with the outer diameter of the core rod.

[0014] In one embodiment, the core housing is made of ferrite.

[0015] In one embodiment, the diameter of the adjustment hole is 0.05mm-1.5mm, and the gap between adjacent adjustment holes is 1.5-5 times the diameter of the hole.

[0016] In one embodiment, the wall of the adjustment hole is provided with an insulating layer, the thickness of which is 5%-15% of the hole diameter.

[0017] This invention addresses the need for dynamic fine-tuning of inductance in high-precision applications by creating adjustment holes on the sidewall of the magnetic core housing. These holes are perpendicular to the axis of the through-hole. By inserting or removing magnetic material, the permeability and reluctance of the magnetic core housing are altered. This allows for changes in the inductance value through dynamic adjustment of the magnetic core, which is crucial for high-precision applications. Unlike traditional surface-mount inductors that use two separate magnetic cores joined together, resulting in irreversible gaps after curing, this invention features a one-piece molded core housing. This avoids the gap issues associated with separate joining and curing, leading to a more stable overall structure. The adjustment holes allow for flexible adjustment of the inductance, enabling dynamic fine-tuning and overcoming the limitations of traditional surface-mount inductors. Furthermore, the multiple adjustment holes increase the contact area between the core housing and the external environment, facilitating heat dissipation, reducing the inductor's operating temperature, and improving its efficiency and reliability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the surface mount inductor provided by this utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure of a surface-mount inductor from another perspective;

[0021] Figure 3 A partial structural schematic diagram of the electromagnetic component provided by this utility model.

[0022] Explanation of icon numbers:

[0023] 100. Surface mount inductor; 1. Core housing; 11. Adjustment surface; 2. Electromagnetic assembly; 21. Coil; 22. Core rod; 23. Conductive terminal; 3. Adjustment hole.

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0026] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] This utility model proposes a surface mount inductor 100.

[0029] Please see Figures 1 to 3 In one embodiment of the present invention, the patch inductor 100 includes a magnetic core housing 1, an electromagnetic component 2, and an adjustment hole 3. The magnetic core housing 1 is an integrally formed structure and has a through hole extending along the axial direction. The electromagnetic component 2 passes through the through hole. The adjustment hole 3 is located on the side wall of the magnetic core housing 1, and the depth direction of the adjustment hole 3 is perpendicular to the axis of the through hole.

[0030] In this embodiment, the magnetic core housing 1 provides a path for magnetic field conduction and concentration. It is understood that the magnetic core housing 1 is integrally formed using methods such as injection molding or 3D printing. The electromagnetic component 2 connects the entire structure to the external circuitry, and the adjustment hole 3 is used to adjust the electromagnetic parameters. It is understood that the adjustment hole 3 can be machined on the sidewall of the magnetic core housing 1 using mechanical processing methods (such as drilling or milling) or laser processing technology. For good electromagnetic performance, the magnetic core housing 1 is an integrally formed structure with an axially penetrating through-hole. Combined with the electromagnetic component 2, this facilitates the formation of a stable inductance magnetic field, improving the stability and accuracy of the inductance value. The integrally formed magnetic core housing 1 structure reduces connection points and weak points between components, improving the overall mechanical strength and stability, enabling it to withstand certain external forces and environmental changes, and ensuring the normal operation of the surface mount inductor. Magnetic materials can be inserted into the adjustment hole 3. It is understood that the magnetic materials here include, but are not limited to, ferrite materials and neodymium iron boron permanent magnets.

[0031] The technical solution of this utility model involves providing adjustment holes 3 on the side wall of the magnetic core housing 1, with the depth direction of the adjustment holes 3 perpendicular to the axis of the through hole. By inserting or removing magnetic material, the permeability and reluctance of the magnetic core housing 1 are changed, thereby altering the inductance value of the inductor and meeting the need for dynamic fine-tuning of inductance in high-precision applications. Compared to traditional surface mount inductors that use two separate magnetic cores joined together, resulting in irreversible gaps after curing, the magnetic core housing 1 of this application is a one-piece molded structure, avoiding the gap problem caused by separate joining and curing. The overall structure is more stable, and the setting of the adjustment holes 3 allows for flexible adjustment of the inductance, achieving dynamic fine-tuning and overcoming the limitations of traditional surface mount inductors. Furthermore, the presence of multiple adjustment holes 3 increases the contact area between the magnetic core housing 1 and the outside environment, which is beneficial for internal heat dissipation, reducing the temperature of the inductor during operation, and improving its working efficiency and reliability.

[0032] In one embodiment of the present invention, the electromagnetic component 2 includes a coil 21, a core rod 22 and two conductive terminals 23. The coil 21 and the core rod 22 are housed in the inner cavity of the magnetic core housing 1. The core rod 22 passes through the through hole and the coil 21 is sleeved on the core rod 22. The coil 21 has a winding segment, and each end of the winding segment extends and is connected to a conductive terminal 23.

[0033] In this embodiment, combined with Figure 3It should be noted that the coil 21 is made of wound wire, with a channel formed within the winding segment for the core rod 22 to pass through. The conductive terminals 23 are used for soldering to a circuit board or other components. The core rod 22 is cylindrical and passes through the through hole and the winding segment of the coil 21 to form an inductor. Specifically, during inductor assembly, the core rod 22 can be first inserted into the channel of the winding segment of the coil 21. After the core rod 22 passes through the channel, the magnetic core housing 1 is integrally molded to assemble a brand-new surface mount inductor 100. When the inductor is in use, the two conductive terminals 23 of the coil 21 can be soldered to a circuit board or other components. Due to the presence of the magnetic core housing 1, magnetic lines of force can be prevented from being exposed outside the magnetic core housing 1, thus avoiding electromagnetic interference to other electronic components.

[0034] In one embodiment of the present invention, the side wall of the magnetic core housing 1 has an adjustment surface 11, and the adjustment surface 11 has a plurality of adjustment holes 3, the depth of which is 20%-50% of the thickness of the adjustment surface 11.

[0035] In this embodiment, by setting an adjustment hole 3 of appropriate depth, the electromagnetic properties of the magnetic core housing 1, such as inductance and magnetic flux, can be flexibly adjusted without compromising the overall structural strength of the magnetic core housing 1 to adapt to different circuit requirements. The adjustment hole 3 can be machined on the side wall adjustment surface 11 of the magnetic core housing 1 using mechanical processing methods (such as drilling or milling). By precisely controlling the feed rate and cutting parameters of the processing equipment, the depth of the adjustment hole 3 is ensured to be between 20% and 50% of the thickness of the adjustment surface 11.

[0036] In one embodiment of this utility model, each adjustment hole 3 is arranged at intervals along the adjustment surface 11.

[0037] In this embodiment, the spaced arrangement ensures that there is sufficient space around each adjustment hole 3 to form an independent magnetic field and stress region, avoiding magnetic field chaos and reduced structural strength caused by excessively dense adjustment holes 3. The spaced adjustment holes 3 can avoid mutual interference between them, ensuring that the adjustment effect of each adjustment hole 3 on the electromagnetic field is relatively independent, improving the adjustment accuracy, and making the magnetic core housing 1 more uniformly stressed, preventing local stress concentration that could lead to structural damage.

[0038] In one embodiment of this utility model, a plurality of adjustment holes 3 are arranged in an array along the adjustment surface 11, and the axes of adjacent rows of adjustment holes 3 are staggered.

[0039] In this embodiment, the staggered array structure enables a more uniform distribution of the magnetic field in all directions, reducing local concentration and leakage of the magnetic field. According to the principle of superposition of electromagnetic fields, the magnetic fields of multiple adjustment holes 3 interact to form a more uniform overall magnetic field environment. This staggered array distribution can further optimize the electromagnetic performance of the magnetic core housing 1, achieving a more uniform magnetic field distribution and higher inductance consistency, while improving space utilization, increasing the number of adjustment holes 3, and enhancing adjustment capability.

[0040] In one embodiment of the present invention, the electromagnetic component 2 further includes a core rod 22, and the diameter of the through hole is interference-fitted with the outer diameter of the core rod 22.

[0041] In this embodiment, the interference fit ensures a tight and reliable connection between the core rod 22 and the magnetic core housing 1, preventing the core rod 22 from loosening or falling off during use, ensuring good electrical connection and mechanical stability, and improving the quality and reliability of the product.

[0042] In one embodiment of this utility model, the material of the magnetic core housing 1 is ferrite.

[0043] In this embodiment, ferrite has excellent magnetic properties, such as high permeability and low loss, which can effectively guide and concentrate magnetic flux, improve the electromagnetic conversion efficiency of the magnetic core, and at the same time have good frequency characteristics, can work stably in a wide frequency range, and are suitable for magnetic components in various electronic devices.

[0044] In one embodiment of this utility model, the diameter of the adjustment hole 3 is 0.05mm-1.5mm, and the gap between adjacent adjustment holes 3 is 1.5-5 times the diameter of the hole.

[0045] In this embodiment, the smaller aperture of the adjustment hole 3 allows for fine adjustment of the electromagnetic field, while appropriately controlling the gap between adjacent holes can prevent excessive interference between magnetic fields. When the aperture and gap are within the aforementioned range, the adjustment hole 3 has a significant impact on the magnetic properties of the magnetic core without causing a significant decrease in structural strength. Within this aperture and gap range, electromagnetic parameters can be effectively adjusted without affecting the overall performance of the magnetic core housing 1, while ensuring the mechanical strength and structural stability of the magnetic core housing 1, and preventing the adjustment holes 3 from weakening the structural strength of the magnetic core housing 1 due to excessive density or size.

[0046] In one embodiment of this utility model, the wall of the adjustment hole 3 is provided with an insulating layer, the thickness of which is 5%-15% of the hole diameter.

[0047] In this embodiment, it should be noted that after the magnetic core housing 1 is processed, an insulating material can be deposited on the wall of the adjustment hole 3 using processes such as chemical plating, physical vapor deposition (PVD), or electroplating. The material of the insulating layer includes ceramics, plastics, oxides, etc., and is not limited here. By controlling the plating or coating time and parameters, the thickness of the insulating layer can reach 5%-15% of the hole diameter; or, during the forming process of the magnetic core housing 1, insulating material can be pre-filled at the position of the adjustment hole 3, so that an insulating layer of a certain thickness can be naturally formed after forming. The insulating layer can prevent short circuits caused by direct contact between conductive materials and the magnetic core housing 1 (ferrite material), ensuring the normal operation of the circuit. At the same time, the insulating layer can also play a certain protective role, preventing impurities from entering the adjustment hole 3 and affecting the performance of the magnetic core.

[0048] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A surface mount inductor, characterized in that, The surface mount inductor includes: The magnetic core housing is an integrally formed structure and has a through hole extending along the axial direction; An electromagnetic component, wherein the electromagnetic component passes through the through hole; An adjustment hole is provided on the side wall of the magnetic core housing, and the depth direction of the adjustment hole is perpendicular to the axis of the through hole.

2. The surface mount inductor as described in claim 1, characterized in that, The electromagnetic component includes a coil, a core rod, and conductive terminals. The coil and the core rod are housed in the inner cavity of the magnetic core housing. The core rod passes through the through hole, and the coil is sleeved on the core rod. The coil has a winding segment, and the two ends of the winding segment extend and connect to the conductive terminals.

3. The surface mount inductor as described in claim 1, characterized in that, The side wall of the magnetic core housing has an adjustment surface, and the adjustment surface has multiple adjustment holes. The depth of the adjustment holes is 20%-50% of the thickness of the adjustment surface.

4. The surface mount inductor as described in claim 3, characterized in that, The adjustment holes are spaced apart along the adjustment surface.

5. The surface mount inductor as described in claim 3, characterized in that, The multiple adjustment holes are arranged in an array along the adjustment surface, and the axes of adjacent columns of adjustment holes are staggered.

6. The surface mount inductor as described in any one of claims 1 to 5, characterized in that, The electromagnetic component also includes a core rod, and the diameter of the through hole is interference-fitted with the outer diameter of the core rod.

7. The surface mount inductor as described in any one of claims 1 to 5, characterized in that, The magnetic core housing is made of ferrite.

8. The surface mount inductor as described in any one of claims 1 to 5, characterized in that, The diameter of the adjustment hole is 0.05mm-1.5mm, and the gap between adjacent adjustment holes is 1.5-5 times the diameter of the hole.

9. The surface mount inductor as described in any one of claims 1 to 5, characterized in that, The wall of the regulating hole is provided with an insulating layer, the thickness of which is 5%-15% of the hole diameter.

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