CN110619987A - Adjustable patch inductor and preparation method thereof - Google Patents

Abstract

The embodiment of the present invention provides an adjustable chip inductor and its preparation method. The adjustable chip inductor includes a magnetic core, a coil winding wound on the magnetic core, and several terminal electrodes. The coil winding is made of a conductor material along the The circumference of the magnetic core is wound on the magnetic core at intervals. The two sides of the bottom surface of a single coil in the coil winding are respectively provided with terminal electrodes. Several terminal electrodes are arranged in an array on the bottom surface of the coil winding. Limit slots for each coil position. By providing a number of terminal electrodes arranged in an array at the bottom of the coil winding, any two terminal electrodes can be selected as the input and output of the inductor according to the actual use requirements, and realized by selecting two different terminal electrodes. The precise adjustment of the number of coil winding turns between the input and output of the inductor can realize the precise adjustment and control of the inductance, so that it has the function of adjustable inductance, which effectively improves the applicability and flexibility of the chip inductor.

Description

Adjustable chip inductor and its preparation method

technical field

The invention relates to the technical field of inductors, and in particular provides an adjustable chip inductor and a preparation method thereof.

Background technique

With the continuous advancement of science and technology and the rapid development of the information industry, large-scale and ultra-large-scale integrated circuits have become the mainstream and trend of development. SMD inductors have the characteristics of small size and high space utilization, and are suitable for surface assembly and high density. Mounting can well meet the requirements of integrated circuits and has high practical value. At present, chip inductors are mainly prepared based on the stacking process and winding process. The inductors prepared based on the stacking process have certain advantages in small size and size standardization, but they cannot meet the requirements of high inductance. volume and high current usage requirements. The inductors prepared based on the winding process have the characteristics of wide coverage of inductance and large working current, but their inductance is relatively fixed, and generally do not have the function of adjustable inductance, which cannot well meet the needs of users in use and circuits. requirements during debugging.

Contents of the invention

The purpose of the present invention is to provide an adjustable chip inductor, aiming to solve the technical problem that the inductance in the inductor in the prior art cannot be adjusted.

In order to achieve the above object, the technical solution adopted by the present invention is: an adjustable chip inductor is provided, including a magnetic core, a coil winding wound on the magnetic core and a number of terminal electrodes, the coil winding is composed of a conductor The material is wound on the magnetic core at intervals along the circumference of the magnetic core, and the two sides of the bottom surface of a single coil in the coil winding are respectively provided with the terminal electrodes, and a plurality of the terminal electrodes are arranged in an array Distributed on the bottom surface of the coil windings, the magnetic core is provided with limiting slots for fixing the positions of the coils.

Optionally, the magnetic core includes a base for supporting the coil winding and a top cover on the base, the base is slidably inserted into the coil winding, and the adjustable chip inductor The device also includes a fixing member for fastening the top cover to the base.

Optionally, on the side of the base close to the top cover, a number of limit strips are protruded along the peripheral side of the base, and any two adjacent limit strips cooperate to form the position for positioning each of the coils. The position of the top cover corresponding to each of the limit bars is provided with a groove for accommodating each of the limit bars.

Optionally, positioning blocks protrude from both ends of the side of the top cover facing the base, and positioning grooves are provided on the base corresponding to the positions of the positioning blocks.

Optionally, the fixing member is epoxy glue, and the epoxy glue covers the joint between the top cover and the base.

Optionally, the coil includes a first section horizontally arranged on the end face of the magnetic core, a second section extending downward along the two ends of the first section toward the height direction of the magnetic core, and a second section on the second section The free end of the second section extends obliquely towards the third section of the second section, the bottom end of each second section is provided with the terminal electrode, and the third section is electrically connected to the adjacent other coil. connect.

Optionally, the coil winding is integrally formed with the terminal electrodes.

Optionally, several of the terminal electrodes are arranged in parallel on the bottom surface of the magnetic core, and the bottom ends of any two of the terminal electrodes are on the same horizontal plane.

An object of the present invention is to provide a method for preparing an adjustable chip inductor, comprising the following steps:

S01: making a magnetic core, the magnetic core includes a base and a top cover arranged on the base;

S02: The conductor material is made into a spiral coil winding by mechanical processing, and several terminal electrodes are formed in an array at the bottom of the coil winding;

S03: Then assemble the coil winding, the base and the top cover, and glue and fix them with epoxy glue.

Optionally, after the manufacturing of the coil winding and the terminal electrodes is completed, the method further includes:

A surface treatment process is used to form a terminal electrode welding coating on the outer surface of the terminal electrode on the side of the coil winding close to the terminal electrode.

Beneficial effects of the present invention: Compared with the prior art, the adjustable chip inductor of the present invention is provided with a number of terminal electrodes arranged in an array at the bottom of the coil winding, so that it can be selected according to actual use requirements Any two terminal electrodes are used as the input and output of the inductor, and the precise adjustment of the number of coil winding turns between the input and output of the inductor can be realized by selecting two different terminal electrodes, so as to realize the precise adjustment and control of the inductance, making it It has the function of adjustable inductance, which effectively improves the applicability and flexibility of chip inductors.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

FIG. 1 is a schematic diagram of a circuit board assembly structure of an adjustable chip inductor provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the assembly structure of the base and the coil winding provided by the embodiment of the present invention;

Fig. 3 is a second schematic diagram of the assembly structure of the base and the coil winding provided by the embodiment of the present invention;

4 is a schematic structural diagram of a coil winding provided by an embodiment of the present invention;

Fig. 5 is a structural schematic diagram 1 of the top cover provided by the embodiment of the present invention;

Fig. 6 is a structural schematic diagram II of the top cover provided by the embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a base provided by an embodiment of the present invention;

FIG. 8 is a schematic flowchart of a method for manufacturing an adjustable chip inductor provided by an embodiment of the present invention.

Among them, the main marks of each accompanying drawing in the figure are:

1-magnetic core; 11-base; 12-top cover; 111-limiting bar; 112-limiting groove; 113-positioning groove; 121-positioning block; 122-groove;

2-coil winding; 21-first section; 22-second section; 23-third section; 24-terminal electrode.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it may be mechanical connection or electrical connection; it may be direct connection or indirect connection through an intermediary, and it may be the internal communication of two elements or the interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

Please refer to FIG. 1 and FIG. 2 together, and now the adjustable chip inductor provided by the embodiment of the present invention will be described. The adjustable chip inductor includes a magnetic core 1, a coil winding 2 and several terminal electrodes 24, wherein the coil winding 2 is wound on the magnetic core 1, and the terminal electrodes 24 are connected to the coil winding 2, so that the external current Through coil winding 2. The coil winding 2 is wound on the magnetic core 1 at intervals along the circumference of the magnetic core 1 by a conductor material, which can be a conventional conductor material with a certain mechanical strength such as copper alloy, aluminum alloy, silver alloy, or the like. New conductor materials doped with polymer metal composite conductor materials, graphene or carbon nanotubes can be used, and the bottom surface of a single coil in the coil winding 2 is respectively provided with terminal electrodes 24, and several terminal electrodes 24 are arranged in an array in the coil winding 2. 2, so that two different terminal electrodes 24 can be connected according to different requirements to obtain different inductances in the inductor, which can effectively improve the applicability and flexibility of the chip inductor; the magnetic core 1 has a limited Position slot 112, wherein the width of the limit slot 112 is slightly larger than the width of the wire material, so that the wire material can be placed into the limit slot 112, so that the limit slot 112 of the magnetic core 1 limits the coil winding 2 The displacement, so that the coil winding 2 is fixed on the magnetic core 1. Preferably, the gap between the coil winding 2 and the contact between the coil winding 2 and the magnetic core 1 is filled with epoxy resin, so that not only the coil winding 2 is fixed on the magnetic core 1, but also the inductor can be better protected , reducing the impact of external impact on the coil winding 2 and the magnetic core 1, improving the anti-vibration and anti-shock performance of the chip inductor, and ensuring the stability of use.

The adjustable chip inductor provided by the embodiment of the present invention has such a structure compared with the prior art. By setting terminal electrodes 24 on both sides of the bottom surface of a single coil in the coil winding 2, several terminal electrodes 24 are arranged in an array. The method is distributed on both sides of the bottom of the magnetic core 1, so that different inductances can be selected according to actual needs during use. For example, if the single-turn inductance is L0 and the total number of turns of the coil winding 2 is N, the adjustable inductance The adjustable range is any inductance in [L0, 4L0, 9L0...N2L0], then two different terminal electrodes 24 can be connected to obtain different inductances in the inductor, effectively improving the performance of the chip inductor. Applicability and flexibility, and make a number of terminal electrodes 24 distributed on both sides of the bottom of the magnetic core 1 in an array, so as to ensure high installation reliability of the inductor. In addition, by providing the limiting groove 112 on the magnetic core 1 , the limiting groove 112 limits the displacement of the coil winding 2 , so that the coil winding 2 is fixed on the magnetic core 1 .

Optionally, please refer to FIGS. 1 to 7 together. As a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, the magnetic core 1 includes a base 11 and a top cover 12. The base 11 can support The coil winding 2, the top cover 12 is installed on the base 11, and the base 11 is slidably inserted into the coil winding 2. Correspondingly, the adjustable chip inductor also includes a fixing part (not shown in the figure), which can make the top cover 12 is fastened on the base 11, for example, the fixing member is non-stick glue, steel clip or fixed code, etc. With such a structure, by disposing the magnetic core 1 separately, during installation, the base 11 is inserted into the coil winding 2, and the top cover 12 is installed on the base 11, and the side of the top cover 12 opposite to the base 11 will resist Coil winding 2, so that the coil winding 2 is firmly on the magnetic core 1, and part of the conductor material on the side of the coil winding 2 close to the top cover 12 is wrapped on the contact surface between the top cover 12 and the base 11, so as to reduce magnetic flux leakage quantity. Preferably, the magnetic core 1 can be made of manganese zinc ferrite, which can meet the requirements of electromagnetic shielding, small leakage inductance and temperature rise of the transformer. Of course, in other embodiments, the magnetic core can be made of soft magnetic materials or non-magnetic materials, soft magnetic materials such as soft ferrite, iron powder core, soft magnetic materials doped polymer materials, etc., non-magnetic materials such as alumina ceramics, Dielectric ceramics, non-magnetic polymer materials, etc. are not limited here.

Optionally, please refer to FIG. 1 and FIG. 7 together. As a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, the side of the base 11 close to the top cover 12 is convex along the peripheral side of the base 11. There are several limit strips 111 arranged at intervals along the length direction of the base 11, any two adjacent limit strips 111 cooperate to form a limit slot 112, and the limit slot 112 can be used to position each coil winding 2 Correspondingly, the side of the top cover 12 close to the base 11 is provided with grooves 122 corresponding to the positions of the limiting bars 111, then during assembly, the limiting bars 111 can be installed in the corresponding grooves 122, so that the base 11 and the The top cover 12 is in closer contact to reduce the size of the inductor. In this embodiment, the height of the limiting strip 111 is smaller than the height of the coil winding 2, and the top cover 12 is provided with an avoidance groove 123 corresponding to each limiting groove 112, so that part of the conductor material exposed in the limiting groove 112 It will protrude into the corresponding escape groove 123, so that the base 11 and the top cover 12 are more compact, thereby reducing the size of the adjustable chip inductor.

Optionally, please refer to Figures 1 to 7 together. As a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, positioning blocks are protruded from both ends of the top cover 12 facing the base 11 121. Correspondingly, the base 11 is provided with positioning grooves 113 corresponding to the positions of the positioning blocks 121, so that the positioning blocks 121 are snapped into the positioning grooves 113 so that the top cover 12 is installed on the base 11 to avoid occurrence of Sliding, thereby effectively protecting the coil winding 2. Wherein the base 11 and the top cover 12 are cuboid structures, and the size and shape of the base 11 and the top cover 12 are consistent, the performance of the inductor is good, and it is easy to manufacture.

Optionally, please refer to Figures 1 to 7 together, as a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, the fixing part is epoxy resin glue, and the epoxy resin covers the top The joint between the cover 12 and the base 11 is used to fix the coil winding 2 , the top cover 12 and the base 11 . In this embodiment, the epoxy resin is a two-component epoxy resin. The two-component epoxy resin has good fluidity and small stress, so that the coil winding 2, the top cover 12 and the base 11 of the adjustable chip inductor form a As a whole, the anti-vibration and anti-shock ability of the inductor can be improved.

Optionally, please refer to FIG. 1 and FIG. 3 together. As a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, the coil winding 2 includes a first section 21, two second sections 22 and The third section 23, wherein the first section 21 is horizontally arranged on the end surface of the magnetic core 1, and the two second sections 22 respectively extend downward along the ends of the first section 21 toward the height direction of the magnetic core 1, and the third section 23 is formed by the free end of one of the second sections 22 extending obliquely toward the direction of the other second section 22, and the bottom end of each second section 22 is provided with an end electrode 24, and the third section 23 is connected to another adjacent coil winding 2 Electrical connection, it can be understood that the first section 21 and the two second sections 22 form a framework similar to a frame, and the third section 23 inclines the bottom end of the framework and connects with the bottom end of another framework. In this embodiment, the first section 21 of the coil winding 2 is arranged horizontally. Since the first section 21 is placed in the limiting groove 112 of the base 11, the processing of the limiting groove 112 is facilitated and the production cost is saved. . In addition, by setting the third section 23 obliquely at the bottom of the magnetic core 1, when the inductor is welded on the integrated circuit, the two terminal electrodes 24 in the coil winding 2 will be misaligned with each other, so as to avoid setting the integrated circuit. The pads on the board will touch each other parallel to protect the circuit. Specifically, the coil winding 2 can be formed by direct molding of conductor materials arranged clockwise or counterclockwise. The conductor material can be conventional conductor materials with certain mechanical strength, such as copper alloy, aluminum alloy, silver alloy, etc. New conductor materials doped with polymer-metal composite conductor materials, graphene or carbon nanotubes can also be used, which are not limited here. The number of terminal electrodes 24 in the coil winding 2 can be 24, and can also be any natural number greater than or equal to 4, thereby forming an adjustable chip inductor, and its terminal electrodes 24 are arranged in an array at the bottom of the inductor. Use any two terminal electrodes 24 as the input and output terminals of the inductor. By selecting two different terminal electrodes 24, the precise adjustment of the number of turns of the coil winding between the input and output of the inductor can be realized, thereby realizing the inductance The precise adjustment and control make it have the function of adjustable inductance, which effectively improves the applicability and flexibility of chip inductors.

Optionally, please refer to FIGS. 1 to 6 together. As a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, the coil winding 2 and the terminal electrodes 24 are integrally formed, thus reducing the number of terminal electrodes 24 The stress at the contact point with the coil winding 2 makes the strength of the terminal electrode 24 high. In this embodiment, the conductive material is made into the helical coil winding 2 by machining and forming, and an array type terminal electrode 24 is formed at the bottom of the coil winding 2, and the helical coil winding 2 is placed at the limit of the magnetic core 1. The magnetic core is mechanically assembled in the bit slot 112, and the coil winding 2 is restrained and fixed, so that the installation reliability of the inductor is high, and the inductor can also be obtained by connecting two different terminal electrodes 24. Different inductances can effectively improve the applicability and flexibility of chip inductors

Optionally, please refer to Figures 1 to 2 together. As a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, several terminal electrodes 24 are arranged in parallel on the bottom surface of the magnetic core 1, and any two The bottom ends of the terminal electrodes 24 are on the same horizontal plane, so as to ensure that the adjustable chip inductor is suitable for surface mounting, and can also effectively improve the installation reliability of the inductor. Preferably, the position of the coil winding 2 corresponding to each terminal electrode 24 can adopt surface treatment processes such as chemical deposition, electrochemical deposition, and physical vapor deposition to form a terminal electrode welding coating (not shown), and the terminal electrode welding coating can be tin Alloy, palladium silver or gold and other materials with good welding wettability can effectively improve the solderability of adjustable chip inductors.

Specifically, the assembly method of the adjustable chip inductor provided by the present invention is as follows: first, the base 11 is slidably inserted into the coil winding 2, and the coil winding 2 is placed in the limiting groove 112 of the base 11, and then The positioning block 121 of the top cover 12 is assembled with the positioning groove 113 of the base 11 and bonded and fixed with epoxy adhesive, so that the coil winding 2 is constrained in the limiting groove 112 of the top cover 12 and the base 11, and then Make sure that the positions of the coil winding 2, the top cover 12 and the base 11 are relatively fixed to ensure the stability of the inductor.

Optionally, please refer to FIG. 1 to FIG. 3 together. As a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, a name plate (not shown) is provided on the top surface of the magnetic core 1 . Wherein, the identification plate can be directly formed on the surface of the magnetic core 1 by laser engraving technology or the identification plate can be fixed on the top surface of the magnetic core 1 by gluing, for example, the identification plate is engraved with "100- 12Ts", where 100 and 12Ts in 100-12Ts represent the nominal inductance and the maximum adjustable number of turns in 1 turn respectively, and there are signs on the electromagnetic to facilitate the adjustable patch for different electrical performance indicators Inductors are differentiated and identified.

In the present invention, a preparation method of an adjustable chip inductor is also provided, as shown in Figure 1 and Figure 8, specifically, the preparation method includes the following steps:

S01: making a magnetic core 1, the magnetic core 1 includes a base 11 and a top cover 12 covered on the base 11;

Specifically, the base 11 and the top cover 12 can be made of the same material, for example, the base 11 and the top cover 12 are both made of soft magnetic material or non-magnetic material. Of course, the base 11 and the top cover 12 can also be made of different materials. For example, the base 11 is made of a non-magnetic material and the top cover 12 is made of a non-magnetic material or the base 11 is made of a non-magnetic material and the top cover 12 is made of a non-magnetic material. Made of soft magnetic materials. Wherein the base 11 is provided with a plurality of limiting strips 111 in the horizontal direction near the top cover 12, and a limiting groove 112 is formed between any two adjacent limiting strips 111, then when the wire in the coil winding 2 is placed in the limiting In the slot 112, the coil winding 2 cannot move freely, so as to ensure the stability of the piezoelectric inductor. And the top cover 12 is also provided with a positioning block 121 towards the side of the base 11, and the position of the base 11 corresponding to the positioning block 121 is also provided with a positioning groove 113, wherein the positioning block 121 and the positioning groove 113 are interference fit, and the top cover 12 is fastened on the base 11.

S02: Machining the conductor material into a helical coil winding 2, and forming an arrayed terminal electrode 24 at the bottom of the coil winding 2;

Specifically, the coil winding 2 is composed of a plurality of single coils, and the two sides of the bottom surface of the single coil are respectively provided with terminal electrodes 24, so that an array of terminal electrodes 24 is formed at the bottom of the coil winding 2, like this, Then, any two terminal electrodes 24 can be selected as the input terminal and output terminal of the inductor according to actual use requirements, and the precise adjustment of the number of turns of the coil winding 2 between the input and output of the inductor can be realized by selecting two different terminal electrodes 24 . In this way, the precise adjustment and control of the inductance can be realized, so that it has the function of adjustable inductance, and the applicability and flexibility of the chip inductor can be effectively improved. In addition, it is also necessary to use a full-foot jig to process the flatness of the terminal electrodes 24, so that several terminal electrodes 24 are located on both sides of the bottom surface of the magnetic core 1 in parallel, and the bottom surfaces of several terminal electrodes 24 are on the same horizontal line, so as to ensure that Adjustable chip inductors are suitable for surface mounting, and can effectively improve the installation reliability of products.

S03: Then assemble the coil winding 2, the base 11 and the top cover 12, and glue and fix them with epoxy glue;

Specifically, the base 11 is slidably inserted into the coil winding 2 first, and the coil winding 2 is placed in the limiting groove 112 of the base 11, and then the positioning block 121 of the top cover 12 is aligned with the positioning groove 113 of the base 11. Assembled and bonded and fixed with epoxy adhesive glue, here a layer of epoxy resin glue can be coated on the base 11 that has been assembled with the coil winding 2, and then the top cover 12 is covered on the base 11, so that the The coil winding 2 is constrained in the limiting groove 112 of the top cover 12 and the base 11, so as to ensure the relatively fixed position of the coil winding 2, the top cover 12 and the base 11, so as to ensure the stability of the inductor.

Optionally, after the coil winding 2 and the terminal electrode 24 are fabricated, step S021 is further included: forming a terminal electrode welding coating on the outer surface of the terminal electrode 24 by using a surface treatment process on the side of the coil winding 2 close to the terminal electrode 24 .

Specifically, the position of the coil winding 2 corresponding to each terminal electrode 24 can be formed by surface treatment processes such as chemical deposition, electrochemical deposition, physical vapor deposition, etc., to form a terminal electrode welding coating, and the terminal electrode welding coating can be tin alloy, palladium silver or Gold and other materials with good welding wettability, thus effectively improving the solderability of adjustable chip inductors

In the present invention, the bottom of the coil winding 2 is provided with a number of terminal electrodes 24 arranged in an array. In this way, any two terminal electrodes 24 can be selected as the input and output of the inductor according to actual use requirements. The two different terminal electrodes 24 realize the precise adjustment of the number of turns of the coil winding between the input and output of the inductor, so as to realize the precise adjustment and control of the inductance, so that it has the function of adjustable inductance and effectively improves the chip inductor applicability and flexibility. In addition, the coil winding 2 and several terminal electrodes 24 are manufactured by one-piece molding, and the parallel array of several terminal electrodes 24 is located at the bottom of the coil winding 2, so as to ensure that the adjustable chip inductor is suitable for surface mounting, and at the same time, the product can be effectively improved. installation reliability.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. An adjustable chip inductor, comprising a magnetic core, a coil winding wound on the magnetic core and some terminal electrodes, it is characterized in that the coil winding is made of conductive material along the circumference of the magnetic core The side is wound on the magnetic core at intervals, the two sides of the bottom surface of a single coil in the coil winding are respectively provided with the terminal electrodes, and a plurality of the terminal electrodes are arranged in an array on the bottom surface of the coil winding, The magnetic core is provided with limiting slots for fixing the positions of the coils. 2. The adjustable chip inductor according to claim 1, wherein the magnetic core includes a base for supporting the coil winding and a top cover set on the base, and the base slides Inserted in the coil winding, the adjustable chip inductor also includes a fixing part for fastening the top cover to the base. 3. The adjustable chip inductor according to claim 2, characterized in that, on the side of the base close to the top cover, a number of limit strips are protruded along the peripheral side of the base, and any adjacent two The limiting strip cooperates to form the limiting groove for positioning each of the coils, and the top cover is provided with a groove for accommodating each of the limiting strips at a position corresponding to each of the limiting strips. 4. The adjustable chip inductor according to claim 3, wherein positioning blocks are protruded from both ends of the side of the top cover facing the base, and the base corresponds to the position of each positioning block There is a positioning slot. 5 . The adjustable chip inductor according to claim 3 , wherein the fixing member is epoxy resin glue, and the epoxy resin glue covers the joint between the top cover and the base. 6 . 6. The adjustable chip inductor according to claim 1, wherein the coil comprises a first section horizontally arranged on the end surface of the magnetic core, along the height of both ends of the first section toward the magnetic core The second section extending downward in the direction and the third section extending obliquely from the free end of one of the second sections towards the other second section, the bottom end of each of the second sections is provided with the terminal electrode , the third segment is electrically connected to another adjacent coil. 7. The adjustable chip inductor according to any one of claims 1-6, wherein the coil winding and the terminal electrodes are integrally formed. 8. The adjustable chip inductor according to any one of claims 1-6, wherein a plurality of terminal electrodes are arranged parallel to the bottom surface of the magnetic core, and the bottom ends of any two terminal electrodes are at on the same level. 9. A method for preparing an adjustable chip inductor, comprising the steps of: S01: making a magnetic core, the magnetic core includes a base and a top cover arranged on the base; S02: The conductor material is made into a spiral coil winding by mechanical processing, and several terminal electrodes are formed in an array at the bottom of the coil winding; S03: Then assemble the coil winding, the base and the top cover, and glue and fix them with epoxy glue. 10. The preparation method of the adjustable chip inductor according to claim 9, further comprising: A surface treatment process is used to form a terminal electrode welding coating on the outer surface of the terminal electrode on the side of the coil winding close to the terminal electrode.