Adjustable chip inductor and preparation method thereof

Abstract

The embodiment of the present invention provides an adjustable chip inductor and a preparation method thereof. The adjustable chip inductor includes a magnetic core, a coil winding wound on the magnetic core, and a plurality of end electrodes. The coil winding is made of a conductor material and wound on the magnetic core at intervals along the circumference of the magnetic core. The bottom surface of a single coil in the coil winding is provided with end electrodes on both sides, and the plurality of end electrodes are arranged in an array on the bottom surface of the coil winding. The magnetic core is provided with a limiting groove for fixing the position of each coil. By providing a plurality of end electrodes arranged in an array at the bottom of the coil winding, any two end electrodes can be selected as the input and output of the inductor according to actual use requirements. By selecting two different end electrodes, the number of coil winding turns between the input and output of the inductor can be accurately adjusted, thereby achieving accurate adjustment and control of the inductance, so that it has the function of adjustable inductance, and effectively improves the applicability and flexibility of the chip inductor.

Description

Technical Field

[0001] The present invention relates to the technical field of inductors, and in particular provides an adjustable chip inductor and a preparation method thereof. Background Art

[0002] 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. Chip inductors have the characteristics of small size and high space utilization, and are suitable for surface assembly and high-density mounting. They can well meet the requirements of integrated circuits and have high practical value. At present, chip inductors are mainly prepared based on the lamination process and the winding process. Among them, the inductors prepared based on the lamination process have certain advantages in small size and size standardization, but cannot well meet the requirements of high inductance and high current. The inductors prepared based on the winding process have the characteristics of wide inductance coverage 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 during use and circuit debugging. Summary of the invention

[0003] The purpose of the present invention is to provide an adjustable chip inductor, aiming to solve the technical problem that the inductance of the inductor in the prior art cannot be adjusted.

[0004] To achieve the above-mentioned purpose, 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 plurality of end electrodes, the coil winding is made of a conductor material and is wound on the magnetic core at intervals along the circumference of the magnetic core, the end electrodes are respectively provided on both sides of the bottom surface of a single coil in the coil winding, and the plurality of end electrodes are arranged in an array on the bottom surface of the coil winding, and the magnetic core is provided with a limiting groove for fixing the position of each coil.

[0005] Optionally, the magnetic core includes a base for supporting the coil winding and a top cover arranged on the base, the base is slidably inserted into the coil winding, and the adjustable chip inductor also includes a fixing part for fastening the top cover to the base.

[0006] Optionally, a plurality of limit strips are protruding along the circumferential side of the base on a surface of the base close to the top cover, and any two adjacent limit strips cooperate to form the limit groove for positioning each coil, and the top cover is provided with a groove for accommodating each limit strip at a position corresponding to each limit strip.

[0007] Optionally, positioning blocks are protruding from both ends of one side of the top cover facing the base, and the base is provided with positioning grooves corresponding to the positions of the positioning blocks.

[0008] Optionally, the fixing member is epoxy resin glue, and the epoxy resin glue covers the connection between the top cover and the base.

[0009] Optionally, the coil includes a first section horizontally arranged on the end surface of the magnetic core, a second section extending downward along the two ends of the first section in the height direction of the magnetic core, and a third section extending obliquely from the free end of one of the second sections toward another second section, the end electrode is provided at the bottom end of each of the second sections, and the third section is electrically connected to another adjacent coil.

[0010] Optionally, the coil winding and the end electrode are integrally formed.

[0011] Optionally, a plurality of the end electrodes are arranged in parallel to the bottom surface of the magnetic core, and the bottom ends of any two of the end electrodes are on the same horizontal plane.

[0012] An object of the present invention is to provide a method for preparing an adjustable chip inductor, comprising the following steps:

[0013] S01: manufacturing a magnetic core, wherein the magnetic core comprises a base and a top cover disposed on the base;

[0014] S02: The conductor material is made into a spiral coil winding by mechanical processing, and a plurality of end electrodes are formed in an array at the bottom of the coil winding;

[0015] S03: Then assembling the coil winding, the base and the top cover, and bonding and fixing them with epoxy resin glue.

[0016] Optionally, after the coil winding and the end electrode are manufactured, the method further includes:

[0017] A surface treatment process is used on one side of the coil winding close to the end electrode to form an end electrode welding coating on the outer surface of the end electrode.

[0018] Beneficial effects of the present invention: Compared with the prior art, the adjustable chip inductor of the present invention has a plurality of end electrodes arranged in an array at the bottom of the coil winding. In this way, any two end electrodes can be selected as the input and output of the inductor according to actual use requirements. By selecting two different end electrodes, the number of coil winding turns between the input and output of the inductor can be accurately adjusted, thereby achieving precise adjustment and control of the inductance, so that the inductance has the function of adjustable inductance, effectively improving the applicability and flexibility of the chip inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of a circuit board assembly structure of an adjustable chip inductor provided in an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the base and coil winding assembly structure provided in an embodiment of the present invention Figure 1 ;

[0022] Figure 3 Schematic diagram of the base and coil winding assembly structure provided in an embodiment of the present invention Figure 2 ;

[0023] Figure 4 A schematic diagram of the structure of a coil winding provided in an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the structure of the top cover provided in the embodiment of the present invention Figure 1 ;

[0025] Figure 6 A schematic diagram of the structure of the top cover provided in the embodiment of the present invention Figure 2 ;

[0026] Figure 7 A schematic diagram of the structure of a base provided in an embodiment of the present invention;

[0027] Figure 8 An embodiment of the present invention provides a schematic flow chart of a method for preparing an adjustable chip inductor.

[0028] Among them, the main marks of the drawings in the figure are:

[0029] 1-magnetic core; 11-base; 12-top cover; 111-limiting strip; 112-limiting groove; 113-positioning groove; 121-positioning block; 122-groove; 123-avoidance groove;

[0030] 2-coil winding; 21-first section; 22-second section; 23-third section; 24-end electrode. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or 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.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Please also read Figure 1 and Figure 2Now, the adjustable chip inductor provided by the embodiment of the present invention is described. The adjustable chip inductor comprises a magnetic core 1, a coil winding 2 and a plurality of end electrodes 24, wherein the coil winding 2 is wound on the magnetic core 1, and the end electrode 24 is connected to the coil winding 2 so that an external current passes through the coil winding 2. The coil winding 2 is wound on the magnetic core 1 along the circumference of the magnetic core 1 at intervals by a conductor material. The conductor material can be a conventional conductor material with a certain mechanical strength such as copper alloy, aluminum alloy, silver alloy, etc., or a polymer metal composite conductor material, a new conductor material doped with graphene or carbon nanotubes. The bottom surface of a single coil in the coil winding 2 is respectively provided with an end electrode 24, and a plurality of end electrodes 24 are arranged in an array on the bottom surface of the coil winding 2. In this way, two different end electrodes 24 can be connected according to different needs to obtain different inductances in the inductor, effectively improving the applicability and flexibility of the chip inductor; the magnetic core 1 is provided with a limiting groove 112, wherein the width of the limiting groove 112 is slightly larger than the width of the wire material, so that the wire material can be placed in the limiting groove 112, so that the limiting groove 112 of the magnetic core 1 limits the displacement of the coil winding 2, so that the coil winding 2 is fixed on the magnetic core 1. Preferably, epoxy resin is filled in the gaps of the coil winding 2 and in contact with the magnetic core 1. This not only fixes the coil winding 2 on the magnetic core 1, but also better protects the inductor, reduces the impact of external impact on the coil winding 2 and the magnetic core 1, improves the vibration and impact resistance of the chip inductor, and ensures stability in use.

[0036] The adjustable chip inductor provided in the embodiment of the present invention has such a structure compared with the prior art. By providing end electrodes 24 on both sides of the bottom surface of a single coil in the coil winding 2, a plurality of end electrodes 24 are distributed on both sides of the bottom end of the magnetic core 1 in an array manner. In this way, 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 range is any inductance in [L0, 4L0, 9L0…N2L0]. Then, by connecting two different end electrodes 24, different inductances in the inductor can be obtained, which effectively improves the applicability and flexibility of the chip inductor, and makes a plurality of end electrodes 24 distributed on both sides of the bottom end of the magnetic core 1 in an array manner, so as to ensure the high installation reliability of the inductor. In addition, by providing a limit groove 112 on the magnetic core 1, the limit groove 112 limits the displacement of the coil winding 2, so that the coil winding 2 is fixed on the magnetic core 1.

[0037] Optionally, please also refer to Figures 1 to 7As 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 mounted on the base 11. The base 11 is slidably inserted into the coil winding 2. Correspondingly, the adjustable chip inductor also includes a fixing member (not shown in the figure), which can fasten the top cover 12 to the base 11. For example, the fixing member is a non-stick adhesive, a steel clip or a fixing code. With such a structure, by setting the magnetic core 1 in a split manner, 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 abut against the coil winding 2, so that the coil winding 2 is firmly fixed on the magnetic core 1, and part of the conductive 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 to reduce the magnetic leakage. 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 material or non-magnetic material, soft magnetic material such as soft ferrite, iron powder core, soft magnetic material doped polymer material, etc., non-magnetic material such as alumina ceramic, dielectric ceramic, non-magnetic polymer material, etc., which is not limited here.

[0038] Optionally, please also refer to Figure 1 and Figure 7 As a specific implementation of the adjustable chip inductor provided by an embodiment of the present invention, a plurality of limiting strips 111 are convexly provided along the circumferential side of the base 11 on a side of the base 11 close to the top cover 12, and the plurality of limiting strips 111 are arranged at intervals along the length direction of the base 11, and any two adjacent limiting strips 111 cooperate to form a limiting groove 112, which can be used to position each coil winding 2, and correspondingly, a groove 122 is provided on a side of the top cover 12 close to the base 11 at a position corresponding to each limiting strip 111, and during assembly, the limiting strip 111 can be installed in the corresponding groove 122, so that the base 11 and the top cover 12 are in closer contact, so as to reduce the volume of the inductor. In this embodiment, the height of the limit strip 111 is less than the height of the coil winding 2, and the top cover 12 is provided with avoidance grooves 123 at the positions corresponding to the limit grooves 112, so that part of the conductor material exposed in the limit grooves 112 will extend into the corresponding avoidance grooves 123, so that the base 11 and the top cover 12 are more compact, thereby reducing the volume of the adjustable chip inductor.

[0039] Optionally, please also refer to Figures 1 to 7As a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, the top cover 12 is provided with positioning blocks 121 at both ends of the side facing the base 11, and 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 sliding between the two, thereby effectively protecting the coil winding 2. Wherein the base 11 and the top cover 12 are both rectangular parallelepiped structures, and the base 11 and the top cover 12 are consistent in size and shape, then the inductor has good performance and is easy to process and manufacture.

[0040] Optionally, please also refer to Figures 1 to 7 As a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, the fixing member is epoxy resin glue, and the epoxy resin covers the connection between the top cover 12 and the base 11 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, which has good fluidity and low stress, so that the coil winding 2, the top cover 12 and the base 11 of the adjustable chip inductor form a whole, thereby improving the vibration and impact resistance of the inductor.

[0041] Optionally, please also refer to Figure 1 and Figure 3As 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 a 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 extend downward along the ends of the first section 21 in 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 electrically connected to another adjacent coil winding 2. It can be understood that the first section 21 and the two second sections 22 form a frame-like skeleton, and the third section 23 is inclined at the bottom end of the skeleton and connected to the bottom end of another skeleton. In this embodiment, the first section 21 in the coil winding 2 is arranged horizontally. Since the first section 21 is placed in the limiting groove 112 of the base 11, it is convenient for the processing and manufacturing of the limiting groove 112, saving production costs. In addition, by obliquely setting the third section 23 at the bottom end of the magnetic core 1, when the inductor is welded on the integrated circuit, the two end electrodes 24 in the coil winding 2 will be misaligned with each other to avoid the pads on the integrated circuit from being parallel to each other and contacting, thereby protecting the circuit. Specifically, the coil winding 2 can be directly formed by a conductor material arranged clockwise or counterclockwise, and the conductor material can be a conventional conductor material with a certain mechanical strength such as copper alloy, aluminum alloy, silver alloy, etc., or a polymer metal composite conductor material, a new conductor material doped with graphene or carbon nanotubes, which is not limited here. The number of end electrodes 24 in the coil winding 2 can be 24, or any natural number greater than or equal to 4, thereby forming an adjustable chip inductor, whose end electrode 24 array is arranged at the bottom of the inductor, and any two end electrodes 24 can be selected as the input and output ends of the inductor according to actual use requirements. By selecting two different end electrodes 24, the number of turns of the coil winding 2 between the input and output of the inductor can be accurately adjusted, thereby achieving precise adjustment and control of the inductance, so that it has the function of adjustable inductance, and effectively improves the applicability and flexibility of the chip inductor.

[0042] Optionally, please also refer to Figures 1 to 6As a specific implementation of the adjustable chip inductor provided in an embodiment of the present invention, the coil winding 2 and the end electrode 24 are integrally formed, which reduces the stress at the contact point between the end electrode 24 and the coil winding 2, so that the strength of the end electrode 24 is high. In this embodiment, the conductor material is made into a spiral coil winding 2 by mechanical processing, and an array of end electrodes 24 are formed at the bottom of the coil winding 2. The spiral coil winding 2 is placed in the limiting groove 112 of the magnetic core 1 and mechanically assembled with the magnetic core, which plays a role in restraining and fixing the coil winding 2. In this way, the installation reliability of the inductor is high, and different inductances in the inductor can be obtained by connecting two different end electrodes 24, which effectively improves the applicability and flexibility of the chip inductor.

[0043] Optionally, please also refer to Figure 1 to Figure 2 As a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, a plurality of terminal electrodes 24 are arranged in parallel on the bottom surface of the magnetic core 1, and the bottom ends of any two terminal electrodes 24 are on the same horizontal plane, thereby ensuring that the adjustable chip inductor is suitable for surface mounting, and the installation reliability of the inductor can be effectively improved. Preferably, the position of the coil winding 2 corresponding to each terminal electrode 24 can be formed with a terminal electrode welding coating (not shown) by a surface treatment process such as chemical deposition, electrochemical deposition, and physical vapor deposition. The terminal electrode welding coating can be a material with good welding wettability such as tin alloy, palladium silver or gold, thereby effectively improving the solderability of the adjustable chip inductor.

[0044] 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 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, thereby ensuring the relative fixation of the positions of the coil winding 2, the top cover 12 and the base 11, so as to ensure the stability of the inductor.

[0045] Optionally, please also refer to Figures 1 to 3 As a specific implementation of the adjustable chip inductor provided by the embodiment of the present invention, a label (not shown) is provided on the top surface of the magnetic core 1. The label can be formed directly on the surface of the magnetic core 1 by laser engraving technology or the label can be fixed on the top surface of the magnetic core 1 by gluing. For example, "100-12Ts" is engraved on the label, where 100 and 12Ts in 100-12Ts represent the nominal inductance at 1 turn and the maximum number of adjustable turns, respectively. Then, a label is provided on the electromagnetic to facilitate the distinction and identification of adjustable chip inductors with different electrical performance indicators.

[0046] In the present invention, a method for preparing an adjustable chip inductor is also provided, such as Figure 1 and Figure 8 Specifically, the preparation method comprises the following steps:

[0047] S01: manufacturing a magnetic core 1, wherein the magnetic core 1 comprises a base 11 and a top cover 12 disposed on the base 11;

[0048] 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 non-magnetic material and the top cover 12 is made of non-magnetic material, or the base 11 is made of non-magnetic material and the top cover 12 is made of soft magnetic material. Among them, the base 11 is provided with a plurality of limit bars 111 in the horizontal direction near the top cover 12, and a limit groove 112 is formed between any two adjacent limit bars 111. When the wire in the coil winding 2 is placed in the limit groove 112, the coil winding 2 cannot be moved at will to ensure the stability of the piezoelectric inductor. And the top cover 12 is also provided with a positioning block 121 on the side facing the base 11, and the base 11 is also provided with a positioning groove 113 at the position corresponding to the positioning block 121, wherein the positioning block 121 and the positioning groove 113 are interference fit, and the top cover 12 is fastened to the base 11.

[0049] S02: using mechanical processing to form a conductor material into a spiral coil winding 2, and forming an array of terminal electrodes 24 at the bottom of the coil winding 2;

[0050] 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 provided with end electrodes 24, so that an array of end electrodes 24 is formed at the bottom of the coil winding 2. In this way, any two end electrodes 24 can be selected as the input and output ends of the inductor according to actual use requirements. By selecting two different end electrodes 24, the number of turns of the coil winding 2 between the input and output of the inductor can be accurately adjusted, thereby realizing accurate adjustment and control of the inductance, so that it has the function of adjustable inductance, and effectively improves the applicability and flexibility of the chip inductor. In addition, it is also necessary to use a whole foot fixture to process the flatness of the end electrode 24, so that several end electrodes 24 are located parallel to both sides of the bottom surface of the magnetic core 1, and the bottom surfaces of several end electrodes 24 are on the same horizontal line, thereby ensuring that the adjustable chip inductor is suitable for surface mounting, and at the same time can effectively improve the installation reliability of the product.

[0051] S03: Then assemble the coil winding 2, the base 11 and the top cover 12, and bond and fix them with epoxy resin glue;

[0052] Specifically, the base 11 is first 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 fixed with epoxy adhesive. Here, a layer of epoxy resin adhesive can be applied 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 coil winding 2 is constrained in the limiting groove 112 of the top cover 12 and the base 11, thereby ensuring the relative fixation of the positions of the coil winding 2, the top cover 12 and the base 11, so as to ensure the stability of the inductor.

[0053] Optionally, after the coil winding 2 and the terminal electrode 24 are manufactured, the method further includes step S021: forming a terminal electrode welding coating on the outer surface of the terminal electrode 24 by using a surface treatment process on a side of the coil winding 2 close to the terminal electrode 24 .

[0054] Specifically, the positions of the coil windings 2 corresponding to the end electrodes 24 can be treated by chemical deposition, electrochemical deposition, physical vapor deposition or other surface treatment processes to form an end electrode welding coating, and the end electrode welding coating can be a material with good welding wettability such as tin alloy, palladium silver or gold, thereby effectively improving the solderability of the adjustable chip inductor.

[0055] In the present invention, by providing a plurality of end electrodes 24 arranged in an array at the bottom of the coil winding 2, any two end electrodes 24 can be selected as the input and output of the inductor according to actual use requirements, and the number of turns of the coil winding 2 between the input and output of the inductor can be accurately adjusted by selecting two different end electrodes 24, thereby achieving precise adjustment and control of the inductance, so that it has the function of adjustable inductance, and effectively improves the applicability and flexibility of the chip inductor. In addition, the coil winding 2 and the plurality of end electrodes 24 are made by one-piece molding, and the plurality of end electrodes 24 are arranged in parallel arrays at the bottom of the coil winding 2, thereby ensuring that the adjustable chip inductor is suitable for surface mounting, and at the same time can effectively improve the installation reliability of the product.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An adjustable chip inductor, comprising a magnetic core, a coil winding wound on the magnetic core, and a plurality of end electrodes, characterized in that: The coil winding is made of a conductor material and is wound on the magnetic core at intervals along the circumference of the magnetic core. The end electrodes are respectively arranged on both sides of the bottom surface of a single coil in the coil winding. A plurality of the end electrodes are arranged in an array on the bottom surface of the coil winding. The magnetic core is provided with a limiting groove for fixing the position of each coil. Two different end electrodes are connected according to different requirements, and the two end electrodes in the coil winding are staggered with each other. 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 also includes a fixing member for fastening the top cover to the base; A plurality of limiting strips are convexly provided on one surface of the base close to the top cover along the circumferential side of the base, and any two adjacent limiting strips cooperate to form the limiting groove for positioning each coil, and a groove for accommodating each limiting strip is provided at a position of the top cover corresponding to each limiting strip; Positioning blocks are protruded from both ends of one side of the top cover facing the base, and the base is provided with positioning grooves corresponding to the positions of the positioning blocks.

2. The adjustable chip inductor according to claim 1, characterized in that: The fixing piece is epoxy resin glue, and the epoxy resin glue covers the connection between the top cover and the base.

3. The adjustable chip inductor according to claim 1, characterized in that: The coil includes a first section horizontally arranged on the end surface of the magnetic core, a second section extending downward along the two ends of the first section in the height direction of the magnetic core, and a third section extending obliquely from the free end of one of the second sections toward another second section, the end electrode is provided at the bottom end of each of the second sections, and the third section is electrically connected to another adjacent coil.

4. The adjustable chip inductor according to any one of claims 1 to 3, characterized in that: The coil winding and the end electrode are integrally formed.

5. The adjustable chip inductor according to any one of claims 1 to 3, characterized in that: A plurality of the end electrodes are arranged in parallel on the bottom surface of the magnetic core, and the bottom ends of any two of the end electrodes are on the same horizontal plane.

6. A method for preparing an adjustable chip inductor as claimed in any one of claims 1 to 5, characterized in that: The steps include: S01: manufacturing a magnetic core, wherein the magnetic core comprises a base and a top cover disposed on the base; S02: The conductor material is made into a spiral coil winding by mechanical processing, and a plurality of end electrodes are formed in an array at the bottom of the coil winding; wherein two different end electrodes are connected according to different requirements, and the two end electrodes in the coil winding are staggered with each other; S03: Then assembling the coil winding, the base and the top cover, and bonding and fixing them with epoxy resin glue.

7. The method for preparing the adjustable chip inductor according to claim 6, characterized in that: After the coil winding and the end electrode are manufactured, the method further comprises: A surface treatment process is used on one side of the coil winding close to the end electrode to form an end electrode welding coating on the outer surface of the end electrode.

Images