Chip power inductor and manufacturing method thereof

Abstract

The invention relates to the technical field of electronic components, in particular to a chip power inductor which comprises a base, a middle column is arranged in the middle of the upper end face of the base, and a coil with an insulating layer is wound on the peripheral face of the middle column. The shell wraps the coil and is exposed out of the base, and sliding grooves are formed in the two sides of the shell; the shielding device is used for connecting adjacent inductors in series and comprises a connecting part connected with the electrodes of the inductors and a clamping part connected with the adjacent inductors, the middle column is wound and sleeved with the coil, the shell wraps the coil to form the inductors, the two inductors are connected in series through the shielding device, and the electrodes of the two inductors are connected through the connecting part. The two inductors are fixed through the clamping part, the clamping part is made of metal and has a shielding effect, magnetic shielding of the inductors is facilitated, the two inductors are connected in series through the shielding device, the inductance values of the inductors are conveniently adjusted according to requirements, the clamping part is conveniently detachably connected with the inductors, the inductance value requirements are adjusted, and meanwhile the inductance value requirements are met. And different coupling coefficients can be achieved according to requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic components, and in particular relates to a chip power inductor and a manufacturing method thereof. Background Art

[0002] An inductor is a component that can convert electrical energy into magnetic energy and store it. It is made of wound wire and mainly plays the role of filtering, oscillation, delay, trapping, etc. in the circuit. It also has the functions of screening signals, filtering noise, stabilizing current and suppressing electromagnetic interference. The most common role of resonant inductance in the circuit is to form an LC filter circuit with a capacitor to suppress higher frequency interference signals. The inductor is an electromagnetic induction element wound with insulated wire and is also one of the commonly used components in electronic circuits. When manufacturing the inductor, it needs to be assembled and installed using a frame to form the entire inductor. At the same time, the length of the leads at both ends of the inductor used to connect other components needs to be cut according to different requirements.

[0003] In the prior art, existing inductors are all one-piece molded structures. When inductors with different inductance values ​​are needed on a circuit board, different models have to be purchased, which is relatively costly. In addition, inductors of different specifications have different inductance values, and the positions that need to be reserved also need to be calculated one by one, resulting in low installation efficiency and long installation time. Therefore, a chip power inductor and a manufacturing method thereof are needed to solve the above problems. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a chip power inductor to solve the problems in the existing market raised in the above background technology.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A chip power inductor, comprising:

[0007] A base, wherein a middle column is provided in the middle of the upper end surface of the base, and a coil with an insulating layer is wound around the outer circumference of the middle column;

[0008] A shell, covering the coil and exposing the base, with slide grooves on both sides of the shell;

[0009] The shielding device is used to connect adjacent inductors in series, and comprises a connecting portion connected to an inductor electrode and a clamping portion connected to an adjacent inductor.

[0010] Through the above technical solution, the coil is wound and sleeved on the central column, the outer shell covers the coil to form an inductor, the shielding device connects the two inductors in series, the electrodes of the two inductors are connected through the connecting part, the two inductors are fixed through the clamping part, and the clamping part is metal with a shielding effect to facilitate magnetic shielding of the inductor. The device connects the two inductors in series through the shielding device, which is convenient for adjusting the inductance value of the inductor according to needs, and the clamping part is convenient for detachable connection with the inductor. While adjusting the inductance value requirements, different coupling coefficients can be achieved according to needs.

[0011] As a preferred solution of the present invention, the coil includes a winding portion and lead portions arranged on both sides of the winding portion, and both ends of the lead portion are lead terminals.

[0012] Through the above technical solution, the coil is a metal wire, and the coil is wound into a hollow cylindrical shape.

[0013] As a preferred solution of the present invention, the connecting portion is connected to the lead terminal of the inductor, and a bump portion is provided at the connection between the connecting portion and the lead terminal.

[0014] Through the above technical solution, the connecting part is connected to the lead terminal of the inductor to connect multiple inductors in series into one, and there are at least two inductors connected in series, and preferably there are two inductors connected in series.

[0015] As a preferred solution of the present invention, a metal sheet is provided on the convex block portion.

[0016] Through the above technical solution, the metal sheet can be further connected to the lead terminal to avoid poor contact due to insufficient contact area with the lead terminal, which is beneficial to increase the contact area and enhance the clamping force.

[0017] As a preferred solution of the present invention, the engaging portion is provided with a plurality of engaging grooves, the engaging grooves are matched with one end of the inductor, and sliders are provided on both sides of the engaging grooves, and the sliders are matched with the slide grooves.

[0018] Through the above technical solution, one end of the inductor is pushed into the engaging groove along the direction of the slider, and the cross-sectional length of the slider changes from small to large from the opening of the engaging groove to the bottom of the engaging groove. The required coupling coefficient is achieved by setting the distance between adjacent engaging grooves.

[0019] As a preferred solution of the present invention, a limit block is provided on the surface of the engaging groove adjacent to the slider, a limit groove is provided on the connecting surface of the housing and the limit block, and the limit groove is matched with the limit block.

[0020] Through the above technical solution, the limiting block is arranged in the limiting groove, which is beneficial to further engage and prevent falling off.

[0021] As a preferred embodiment of the present invention, metal fibers are provided on the side walls of the engaging portion.

[0022] Through the above technical solution, the metal fiber has a certain sound insulation effect and further enhances the shielding effect, and the uneven surface of the metal fiber is beneficial to enhance the friction and further avoid falling off.

[0023] As a preferred solution of the present invention, an insulating layer is provided on the outer surface of the engaging portion, and the insulating layer material is epoxy resin.

[0024] Through the above technical solution, the insulating layer is beneficial to prevent the clamping part from being connected to other external electrodes and affecting the inductance effect.

[0025] A method for manufacturing a chip power inductor comprises the following steps:

[0026] S1. Prepare a coil, wind a metal wire into a hollow cylindrical shape, and place the lead wires of the coil on both sides of the winding part;

[0027] S2, preparing a base, and pressing the magnetic powder into a base magnetic core through a mold;

[0028] S3, assembling the lower module, and sleeve the coil in step S1 on the outer peripheral surface of the middle column in step S2;

[0029] S4, preparing the shell, placing the upper mold assembly in S1 on the mold, and combining the magnetic powder with the upper mold assembly to form an inductor semi-finished product;

[0030] S5. Prepare electrodes, and bend the lead wires of the coil from both sides of the base to the lower end surface of the base;

[0031] S6, preparing a shielding device, arranging the connecting part in the clamping part and connecting them into one;

[0032] S7. Assemble into a series inductor, install one end of the inductor one into the first clamping slot, and install one end of the inductor two into the second clamping slot, so that the inductor one and the inductor two form a series inductor.

[0033] As a preferred solution of the present invention, step S6 also includes:

[0034] S61, punching the connection portion to have a convex portion, and connecting the metal sheet to the convex portion;

[0035] S62, spraying adhesive material on the outer peripheral surface of the engaging portion;

[0036] S63, connecting the connecting portion and the engaging portion into one.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The coil is wound and sleeved on the middle column, and the shell covers the coil to form an inductor. The shielding device connects the two inductors in series, connects the electrodes of the two inductors through the connecting part, and fixes the two inductors through the clamping part. The clamping part is metal and has a shielding effect to facilitate magnetic shielding of the inductor. The device connects the two inductors in series through the shielding device, which is convenient for adjusting the inductance value according to needs. The clamping part is convenient for disassembly and connection with the inductor. While adjusting the inductance value requirements, different coupling coefficients can be achieved according to needs;

[0039] Shielding is also beneficial for enhancing protection against inductance;

[0040] The shielding device has a certain magnetic shielding effect, which reduces the magnetic leakage of the inductor and further enhances the performance of the inductor;

[0041] The shielding device is easy to disassemble and install, and is convenient for adjusting the inductance value of the inductor according to different usage requirements, and the disassembly and installation efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a structural schematic diagram of the present invention;

[0044] Figure 2 For the present invention Figure 1 A schematic diagram of the structure of the shielding device in a top view;

[0045] Figure 3 For the present invention Figure 1 Schematic diagram of the local structure in;

[0046] Figure 4 For the present invention Figure 1 Schematic diagram of the shielding device structure;

[0047] Figure 5 For the present invention Figure 1 Schematic diagram of the connection structure in FIG.

[0048] Figure 6 For the present invention Figure 1 Schematic diagram of the inductor structure.

[0049] 1. Inductor; 11. Base; 2. Coil; 21. Winding portion; 22. Lead portion; 221. Lead terminal; 3. Housing; 31. Slide groove; 4. Shielding device; 41. Connecting portion; 42. Engaging portion; 411. Protrusion portion; 412. Metal sheet; 421. Engaging groove; 422. Slider; 423. Limiting block. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] The present invention provides the following embodiments:

[0052] Embodiment 1:

[0053] A chip power inductor, comprising:

[0054] A base 11, a middle column is provided in the middle of the upper end surface of the base 11, the middle column coincides with the central axis of the base 11, a coil 2 with an insulating layer is wound around the outer circumference of the middle column, the coil 2 is made of metal, and the insulating layer is made of resin rubber; the coil 2 includes a winding portion 21 and lead portions 22 provided on both sides of the winding portion 21, both ends of the lead portion 22 are lead terminals 221, the coil 2 is a metal wire, and the coil 2 is wound into a hollow cylindrical shape;

[0055] The shell 3 covers the coil 2 and exposes the base 11, and the two sides of the shell 3 are provided with slide grooves 31;

[0056] The shielding device 4 is used to connect adjacent inductors 1 in series, including a connecting portion 41 connected to an electrode of the inductor 1, and a snap-fit ​​portion 42 connected to an adjacent inductor 1, wherein at least one connecting portion 41 is provided, and preferably two connecting portions 41 are provided; the connecting portion 41 is connected to a lead terminal 221 of the inductor 1, and a bump portion 411 is provided at the connection between the connecting portion 41 and the lead terminal 221, and the connecting portion 41 is connected to the lead terminal 221 of the inductor 1 to connect multiple inductors 1 in series as one, and at least two inductors 1 are connected in series, and preferably two inductors 1 are connected in series. There are two inductors 1; the clamping portion 42 is provided with a plurality of clamping grooves 421, the depth of the clamping groove 421 is 0.01-10 cm, and the preferred depth of the clamping groove 421 is 0.3 cm. The clamping groove 421 is adapted to one end of the inductor 1, and sliders 422 are provided on both sides of the clamping groove 421. The sliders 422 are adapted to the slide groove 31. When one end of the inductor 1 is pushed into the clamping groove 421 along the direction of the slider 422, the cross-sectional length of the slider 422 from the opening of the clamping groove 421 to the bottom of the clamping groove 421 changes from small to large.

[0057] Preferably, the engaging portion 42 is made of an electrical shielding material, such as any one or more of copper, nickel, tin, silver, gold, and alloys;

[0058] Preferably, the engaging portion 42 is made of magnetic shielding material, such as one or more materials with high magnetic permeability such as iron-nickel alloy and silicon steel sheet.

[0059] As a further improvement of the present invention, a metal sheet 412 is provided on the protruding portion 411, which facilitates further connection with the lead terminal 221 to avoid poor contact due to insufficient contact area with the lead terminal 221, and is beneficial to increasing the contact area and enhancing the clamping force.

[0060] As a further improvement of the present invention, a limit block 423 is provided on the surface adjacent to the slider 422 in the engagement groove 421, a limit groove is provided on the connecting surface between the shell and the limit block 423, the limit groove is adapted to the limit block 423, and the limit block 423 is arranged in the limit groove, which is beneficial to further engagement and avoid falling off.

[0061] As a further improvement of the present invention, the side wall of the clamping part 42 is provided with metal fibers, which have a certain sound insulation effect and further enhance the shielding effect, and the uneven surface of the metal fibers is beneficial to enhance the friction and further avoid falling off. The outer surface of the clamping part 42 is provided with an insulating layer, and the insulating layer material is epoxy resin. The insulating layer is beneficial to avoid the clamping part 42 being connected to other external electrodes to affect the effect of the inductor 1.

[0062] Embodiment 2:

[0063] A method for manufacturing a chip power inductor comprises the following steps:

[0064] S1, prepare the coil 2, wind the metal wire into a hollow cylindrical shape, and arrange the lead wire part 22 of the coil 2 on both sides of the winding part 21;

[0065] S2, preparing the base 11, and pressing the magnetic powder into a magnetic core of the base 11 through a mold;

[0066] S3, assembling the lower module, and sleeve the coil 2 in step S1 on the outer peripheral surface of the middle column in step S2;

[0067] S4, prepare the shell, place the upper mold assembly in S1 on the mold, and mix the magnetic powder with the upper mold assembly to form a semi-finished inductor 1;

[0068] S5, preparing electrodes, bending the lead parts 22 of the coil 2 from both sides of the base 11 to the lower end surface of the base 11 to make the inductor 1;

[0069] S6, preparing the shielding device 4, arranging the connecting portion 41 in the clamping portion 42 to connect them into one;

[0070] Step S6 also includes:

[0071] S61, punching the connection portion 41 to have a convex portion 411, and connecting the metal sheet 412 to the convex portion 411;

[0072] S62, spraying adhesive material on the outer peripheral surface of the engaging portion 42;

[0073] S63, connecting the connecting portion 41 and the engaging portion 42 into one body;

[0074] S7. Assemble into a series inductor, install one end of the inductor 1 into the snap-fit ​​slot 421 1, and install one end of the inductor 2 into the snap-fit ​​slot 421 2, so that the inductor 1 and the inductor 2 form a series inductor.

[0075] Preferably, step S5 further includes the following steps: S51, tinning the contact surface between the inductor 1 and the engaging slot 421. This is beneficial to increasing the metal conductive surface and improving the conductive efficiency.

[0076] Embodiment 3:

[0077] Different from Example 1, the lower module of the inductor 1 is installed in the snap-fit ​​groove 421, so that the coil 2 is connected to the connecting part 41, the snap-fit ​​groove 421 is adapted to the coil 2, and the base 11 is adapted to the opening of the snap-fit ​​part 42. Preferably, the base 11 and the snap-fit ​​part 42 are connected as a whole by glue dispensing.

[0078] The coil 2 is wound and sleeved on the center column, the shell 3 covers the coil 2 to form an inductor 1, the shielding device 4 connects the two inductors 1 in series, the electrodes of the two inductors 1 are connected through the connecting part 41, and the two inductors 1 are fixed through the clamping part 42. The clamping part 42 is metal and has a shielding effect to facilitate magnetic shielding of the inductor 1. The device connects the two inductors 1 in series through the shielding device 4, which is convenient for adjusting the inductance value of the inductor 1 according to needs. The clamping part 42 is easy to be disassembled and connected with the inductor 1. While adjusting the inductance value requirements, different coupling coefficients can be achieved according to needs, which reduces complex production processes and processes and can better serve and develop the market.

[0079] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A chip power inductor, characterized in that ,include: A base (11), wherein a middle column is provided in the middle of the upper end surface of the base (11), and a coil (2) having an insulating layer is wound around the outer circumference of the middle column; A shell (3) covers the coil (2) and exposes the base (11), and slide grooves (31) are provided on both sides of the shell (3); A shielding device (4) is used to connect adjacent inductors (1) in series, comprising a connecting portion (41) connected to an electrode of the inductor (1), and a snap-fit ​​portion (42) connected to an adjacent inductor (1).

2. The chip power inductor according to claim 1, characterized in that: The coil (2) comprises a winding portion (21) and lead portions (22) arranged on both sides of the winding portion (21), and both ends of the lead portion (22) are lead terminals (221).

3. The chip power inductor according to claim 1, characterized in that: The connecting portion (41) is connected to the lead terminal (221) of the inductor (1), and a bump portion (411) is provided at the connection between the connecting portion (41) and the lead terminal (221).

4. The chip power inductor according to claim 1, characterized in that: A metal sheet (412) is provided on the convex block portion (411).

5. The chip power inductor according to claim 1, characterized in that: The clamping portion (42) is provided with a plurality of clamping grooves (421), the clamping grooves (421) are matched with one end of the inductor (1), and sliding blocks (422) are provided on both sides of the clamping grooves (421), and the sliding blocks (422) are matched with the sliding grooves (31).

6. The chip power inductor according to claim 1, characterized in that: A limiting block (423) is provided on the surface of the engaging groove (421) adjacent to the sliding block (422), and a limiting groove is provided on the connecting surface between the housing and the limiting block (423), and the limiting groove is matched with the limiting block (423).

7. The chip power inductor according to claim 1, characterized in that: The side wall of the clamping portion (42) is provided with metal fibers.

8. The chip power inductor according to claim 1, characterized in that: An insulating layer is provided on the outer surface of the clamping portion (42), and the insulating layer material is epoxy resin.

9. A method for manufacturing a chip power inductor, according to the chip power inductor of claims 1-8, characterized in that: The following steps are involved: S1, preparing a coil (2), winding a metal wire into a hollow cylindrical shape, and arranging the lead wire portion (22) of the coil (2) on both sides of the winding portion (21); S2, preparing a base (11), and pressing the magnetic powder into a magnetic core of the base (11) through a mold; S3, assembling the lower module, and sleeve the coil (2) in step S1 on the outer peripheral surface of the middle column in step S2; S4, prepare the shell, place the upper mold assembly in S1 on the mold, and mix the magnetic powder with the upper mold assembly to form an inductor (1) semi-finished product; S5, preparing electrodes, bending the lead portion (22) of the coil (2) from both sides of the base (11) to the lower end surface of the base (11); S6, preparing the shielding device (4), arranging the connecting portion (41) in the clamping portion (42) to connect them as one; S7, assembling into a series inductor (1), installing one end of inductor (1) 1 into snap-fit ​​groove (421) 1, and installing one end of inductor (1) 2 into snap-fit ​​groove (421) 2, so that inductor (1) 1 and inductor (1) 2 form a series inductor (1).

10. The method for manufacturing a chip power inductor according to claim 8, characterized in that: Step S6 also includes: S61, punching the connection portion (41) to have a convex portion (411), and connecting the metal sheet (412) to the convex portion (411); S62, spraying adhesive material on the outer peripheral surface of the engaging portion (42); S63, connecting the connecting portion (41) and the engaging portion (42) into one body.

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