Miniaturized integrated inductor and method of use, power converter

Abstract

The application provides a miniaturized integrated inductor and a method for using the same, and a converter. The integrated inductor comprises a main magnetic core and a plurality of coil windings wound on the main magnetic core, and the plurality of coil windings are used to provide a common mode inductance. The integrated inductor further comprises a magnetic strip, the magnetic strip passes through a hollow part of the coil windings, and the magnetic strip is used to provide a differential mode inductance. The position of the magnetic strip relative to the main magnetic core, and / or the size of the magnetic strip, and / or the material of the magnetic strip are allowed to be adjusted to change the magnetic field of the integrated inductor. In this way, the integrated inductor has a large common mode inductance and a small differential mode inductance, the manufacturability is greatly improved, the circuit area is reduced and the cost is reduced. In addition, by adjusting the magnetic strip, the shape of the magnetic field of the integrated inductor, the magnetic field parameters and the like can be changed, which can reduce the debugging cost and increase the debugging efficiency.

Description

Technical Field

[0001] This application relates to electronic components, and more particularly to a miniaturized integrated inductor and its usage method, and a converter. Background Technology

[0002] A converter is an electrical device that changes the voltage, frequency, number of phases, and other electrical quantities or characteristics of a power supply system. Converters can include inverters, which are devices that convert direct current (DC) energy into alternating current (AC) energy through the switching on and off of semiconductor power switching devices. Normal inverters require common-mode inductors to reduce electromagnetic interference (EMI). Furthermore, inverters operate in parallel and require differential-mode inductors, resulting in larger circuit boards that cannot be miniaturized, leading to manufacturing difficulties and high costs. Additionally, during the inverter design phase, the specific parameters of the common-mode and differential-mode inductors need to be adjusted to achieve the desired design effect, requiring matching combinations of different types of common-mode and differential-mode inductors, which consumes significant manpower and resources. Summary of the Invention

[0003] This application provides a miniaturized integrated inductor and its usage method, as well as a converter.

[0004] The technical solution of this application is implemented as follows:

[0005] In a first aspect, embodiments of this application provide a miniaturized integrated inductor, characterized in that the integrated inductor includes a main magnetic core and a plurality of coil windings wound on the main magnetic core, wherein the plurality of coil windings are used to provide common-mode inductance;

[0006] The integrated inductor also includes a magnetic strip that passes through the hollow portion of the coil winding, and the magnetic strip is used to provide differential mode inductance.

[0007] The position of the magnetic strip relative to the main magnetic core, and / or the size of the magnetic strip, and / or the material of the magnetic strip may be adjusted to change the magnetic field of the integrated inductor.

[0008] In some embodiments, the magnetic stripe is movably connected to the main magnetic core to allow the magnetic stripe to move relative to the main magnetic core.

[0009] In some embodiments, the diameter of the hollow portion of the coil winding minus the thickness of the magnetic strip minus the thickness of the main magnetic core equals a first value. This first value allows the magnetic strip to be stabilized between the coil winding and the main magnetic core by gravity and friction, thereby achieving a movable connection between the magnetic strip and the main magnetic core.

[0010] In some embodiments, the surface of the magnetic strip has multiple protrusions to increase the friction between the magnetic strip and the coil winding and between the magnetic strip and the main magnetic core; and / or, the surface of the coil winding near the magnetic strip has multiple protrusions to increase the friction between the magnetic strip and the coil winding; and / or, the surface of the main magnetic core near the magnetic strip has multiple protrusions to increase the friction between the magnetic strip and the main magnetic core.

[0011] In some embodiments, the integrated inductor further includes a movable connector, through which the magnetic strip is connected to the main magnetic core, or through the movable connector, the magnetic strip is connected to the coil winding; wherein the movable connector includes at least: a snap fastener, a snap ring, and an elastic retaining ring.

[0012] In some embodiments, the magnetic strip includes multiple independent magnetic strip segments, and adjacent magnetic strip segments are detachably connected; wherein the different magnetic strip segments have different shapes and / or materials, and the detachable connection includes at least: threaded connection, snap-fit ​​connection and hinge connection.

[0013] In some embodiments, a portion of the magnetic strip is wrapped with a first insulating material, and a portion of the main magnetic core is wrapped with a second insulating material. The first insulating material and the second insulating material are fixedly connected to fix the magnetic strip to the main magnetic core; the fixed connection includes at least an adhesive connection.

[0014] In some embodiments, the main magnetic core is elliptical, and the long side of the ellipse extends along a first direction; a plurality of coil windings are wound around the long side of the main magnetic core, and the plurality of coil windings are arranged along the first direction; the magnetic strip extends in a straight line, and the magnetic strip extends along the first direction and penetrates the hollow portion of the plurality of coil windings.

[0015] Secondly, embodiments of this application provide a method for using an integrated inductor, applied to a miniaturized integrated inductor as described in the first aspect; the method includes:

[0016] During the design phase, the magnetic strip and the main magnetic core in the integrated inductor are connected movably, allowing the position of the magnetic strip relative to the main magnetic core to be changed based on preset position parameters, the size of the magnetic strip to be changed based on preset size parameters, and the material of the magnetic strip to be adjusted based on preset material parameters, so as to generate the integrated inductor to be tested;

[0017] During the verification phase, the integrated inductor to be tested is subjected to performance tests until the optimal location parameters, optimal size parameters, and optimal material parameters are determined.

[0018] During the assembly phase, based on optimal position parameters, optimal size parameters, and optimal material parameters, the magnetic strip is fixed onto the main magnetic core, and the integrated inductor is encapsulated in an inductor box.

[0019] Thirdly, embodiments of this application provide a converter, characterized in that the converter includes an inductor box, and the inductor box includes an integrated inductor as described in the first aspect.

[0020] This application provides a miniaturized integrated inductor and its usage method, as well as a converter. By introducing a magnetic strip into the common-mode inductor, the magnetic circuit can be changed, increasing the single-phase leakage inductance. This allows the differential-mode inductor to be integrated onto the common-mode inductor, resulting in a miniaturized integrated inductor that simultaneously possesses a large common-mode inductance and a small differential-mode inductance. This significantly improves manufacturability, reduces circuit area, and lowers costs. Furthermore, by adjusting the magnetic strip, the magnetic field shape and parameters of the integrated inductor 10 can be changed, allowing for fine-tuning of the differential-mode inductance. This enables convenient and flexible design verification during the design phase until ideal production parameters are obtained, reducing debugging costs and increasing debugging efficiency. Attached Figure Description

[0021] Figure 1 A front view of the integrated inductor provided in an embodiment of this application;

[0022] Figure 2 Top and side views of the integrated inductor provided in the embodiments of this application;

[0023] Figure 3 A schematic diagram of the magnetic stripe shape of an integrated inductor provided in an embodiment of this application;

[0024] Figure 4 A schematic diagram illustrating the change in the magnetic stripe position of an integrated inductor provided in an embodiment of this application;

[0025] Figure 5 A schematic diagram of the dimensions of an integrated inductor provided in an embodiment of this application;

[0026] Figure 6 A schematic diagram of the magnetic stripe protrusion of an integrated inductor provided in an embodiment of this application;

[0027] Figure 7 A schematic diagram of the main magnetic core protrusion of the integrated inductor provided in an embodiment of this application.

[0028] Figure 8 A schematic diagram illustrating the change in the magnetic stripe size of an integrated inductor provided in an embodiment of this application;

[0029] Figure 9 A schematic diagram of the magnetic stripe segment of an integrated inductor provided in an embodiment of this application;

[0030] Figure 10 This is a schematic diagram of another integrated inductor structure provided in an embodiment of this application;

[0031] Figure 11 This is a schematic diagram of the structure of another integrated inductor provided in an embodiment of this application;

[0032] Figure 12 A flowchart illustrating a method of using an integrated inductor provided in an embodiment of this application;

[0033] Figure 13 This is a schematic diagram of a converter provided in an embodiment of this application. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely for explaining the relevant application and not for limiting the application. It should also be noted that, for ease of description, only the parts related to the relevant application are shown in the accompanying drawings. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application. In the following description, references to "some embodiments" describe a subset of all possible embodiments; however, it is understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict. It should be noted that the terms "first, second, third" involved in the embodiments of this application are only used to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described.

[0035] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0036] In one embodiment of this application, please refer to Figure 1 This is a front view of an integrated inductor 10 provided in an embodiment of this application. Please refer to... Figure 1 The miniaturized integrated inductor 10 includes a main magnetic core 11 and a plurality of coil windings 12 wound on the main magnetic core, the plurality of coil windings 12 being used to provide common-mode inductance; the integrated inductor 10 also includes a magnetic strip 13 passing through the hollow portion of the coil windings 12, the magnetic strip 13 being used to provide differential-mode inductance; wherein, adjusting the magnetic strip 13 will change the magnetic field of the integrated inductor 10.

[0037] In this way, by introducing the magnetic strip 13, the magnetic circuit can be changed, increasing the single-phase leakage inductance. This allows the differential-mode inductor to be integrated onto the common-mode inductor, resulting in a miniaturized integrated inductor 10 with both a large common-mode inductance and a small differential-mode inductance. This significantly improves manufacturability, reduces circuit area, and lowers costs. Furthermore, by adjusting the magnetic strip 13, the shape and parameters of the magnetic field of the integrated inductor 10 can be changed, thus allowing for adjustment of the inductance parameters of the differential-mode inductor 10. This enables convenient and flexible design verification during the design phase until ideal production parameters are obtained, reducing debugging costs and increasing debugging efficiency.

[0038] Figure 2 Image (a) provides a top view of the integrated inductor 10. Figure 2 Figure (b) provides a side view of the integrated inductor 10. It should be understood that... Figure 1 and Figure 2 This is merely one specific structure of the integrated inductor 10 and does not constitute a limitation on its specific shape.

[0039] For example, the shape of the main magnetic core 11 can be chosen from a variety of options, such as elliptical (see [link to documentation]). Figure 1 ), circular (see also) Figure 10 ), rectangle (see Figure 11 Trapezoidal, etc., the main magnetic core 11 is generally a closed shape.

[0040] For example, the specific distribution of the coil windings 12 on the main magnetic core 11 has several options, such as being distributed continuously and at intervals on one side of the main magnetic core 11 (see [link to documentation]). Figure 1 ), or evenly spaced on the main magnetic core 11 (see [link]). Figure 10 ).exist Figure 1 In this case, the number of loop groups 12 is 3, but this is not a specific limitation; the number of loop groups 12 can be more or less.

[0041] For example, the magnetic strip 13 can be a non-closed shape, such as a long strip (see [link to documentation]). Figure 1 ), wavy (see below) Figure 3 (a) in the middle), cane type ((see also) Figure 3 (b) in the middle), U-shaped (see also) Figure 3 (b) or non-closed irregular shape; the magnetic strip 13 can also be a closed shape, such as a circle, ring, rectangle or continuous closed polygon.

[0042] In some embodiments, the position of the magnetic strip 13 relative to the main magnetic core 11 can be adjusted to change the magnetic field of the integrated inductor 10.

[0043] Thus, taking the long strip of magnetic strip 13 as an example, let's compare... Figure 1 and Figure 4 By adjusting the relative position of the magnetic strip 13 and the main magnetic core 11, the total cross-sectional area of ​​the magnetic strip 13 and the main magnetic core 11 can be changed. Moreover, the position of the magnetic strip 13 also changes the shape of the overall magnetic field, thereby changing the magnetic field of the integrated inductor 10.

[0044] In a first specific embodiment, the magnetic strip 13 is movably connected to the main magnetic core 11 to allow the magnetic strip 13 to move relative to the main magnetic core 11.

[0045] In other words, because the magnetic strip 13 passes through the hollow part of the winding wire assembly 12, even if there is no fixed connection between the magnetic strip 13 and the main magnetic core 11, such as welding or gluing, the magnetic strip 13 can be stabilized or stuck between the main coil 11 and the winding wire assembly 12 by means of friction and its own weight, thereby allowing the tester to move the magnetic strip 13 and change the position of the magnetic strip 13 relative to the main magnetic core 11.

[0046] For example, please see Figure 5 The diameter d1 of the hollow portion of the coil winding 12 minus the thickness d3 of the magnetic strip 13 minus the thickness d2 of the main magnetic core equals a first value. This first value allows the magnetic strip 13 to be stabilized between the coil winding 12 and the main magnetic core 11 by gravity and friction, thus achieving a movable connection between the magnetic strip 13 and the main magnetic core 11. That is, the first value can be close to 0, for example, ≤0.5 cm, so that the magnetic strip 13 can move under a large external force but will not move relative to the coil winding 12 under only a small amount of shaking.

[0047] Furthermore, to increase friction and better stabilize the magnetic strip 13, some protrusions can be set to increase the contact area between the magnetic strip and other parts. Specifically:

[0048] (a) Please see Figure 6 The surface of the magnetic strip 13 has multiple protrusions to increase the friction between the magnetic strip 13 and the coil winding 12 and between the magnetic strip 13 and the main magnetic core 11;

[0049] And / or,

[0050] (b) The surface of the coil winding 12 near the magnetic strip 13 has multiple protrusions to increase the friction between the magnetic strip 13 and the coil winding 12;

[0051] And / or,

[0052] (c) Please see Figure 7 The main magnetic core 11 has multiple protrusions on its surface near the magnetic strip 13 to increase the friction between the magnetic strip 13 and the main magnetic core 11.

[0053] It should be noted that these protrusions can be part of the device shape. For example, the surface of the magnetic strip 13 / winding wire group 12 / main magnetic core 11 can be designed to be uneven; or, a rope, tape, metal wire or other material with a high degree of roughness can be wrapped around the surface of the magnetic strip 13 / winding wire group 12 / main magnetic core 11 to create protrusions.

[0054] In a second specific embodiment, the integrated inductor 10 further includes a movable connector, through which the magnetic strip 13 is connected to the main magnetic core 11, or the magnetic strip 13 is connected to the coil winding 12.

[0055] It should be noted that the movable connectors include at least: snaps, spring clips, and elastic retaining rings, which are generally made of insulating materials.

[0056] In this way, by removing the movable connector, the position of the magnetic strip 13 can be flexibly adjusted, thereby adjusting the magnetic field of the integrated inductor 10.

[0057] In some embodiments, comparison Figure 1 and Figure 8 The dimensions of the magnetic strip 13 can be adjusted to change the magnetic field of the integrated inductor 10. The dimensions include at least length, thickness, and width.

[0058] In this way, by adjusting the size of the magnetic strip 13, the shape of the overall magnetic field can be adjusted, and the specific value of the single-phase leakage inductance can be changed, thereby changing the value of the differential mode inductance.

[0059] In one feasible embodiment, for size adjustment, please refer to [link to relevant documentation]. Figure 9 The magnetic strip 13 includes multiple independent magnetic strip segments 13, and adjacent magnetic strip segments 131 are detachably connected; wherein, the detachable connection includes at least: threaded connection, snap-fit ​​connection, and hinge connection.

[0060] In this way, since the magnetic strip segment 13 is detachably connected, the total length (or thickness and width) of the magnetic strip 13 can be changed by installing / removing a specified number of magnetic strip segments 13, thereby achieving flexible adjustment during the testing phase.

[0061] In addition, different magnetic strip segments 131 can have different shapes. Therefore, by installing magnetic strip segments 131 of different shapes, the relative cross-sectional area between the magnetic strip 13 and the main magnetic core 11 can be adjusted, thereby adjusting the magnetic field of the integrated inductor 10.

[0062] In some embodiments, the material of the magnetic strip 13 can be adjusted to change the magnetic field of the integrated inductor 10.

[0063] It should be noted that the magnetic strip 13 can be made of different magnetic materials, and different magnetic materials have different permeabilities. Therefore, changing the material of the magnetic strip 13 can also change the magnetic field of the tolerance inductor 10.

[0064] In one specific embodiment, the magnetic strip 13 may be non-removable and movably connected to the main magnetic core 11. In this case, the magnetic strip 13 is made of multiple magnetic materials, meaning that the material is different at different positions of the magnetic strip 13. Thus, changing the position of the magnetic strip 13 relative to the main magnetic core 11 also changes the specific material of the relative cross-section of the magnetic strip 13 and the main magnetic core 11, and both factors will cause a change in the overall magnetic field.

[0065] In another specific embodiment, the magnetic strip 13 can be designed to be detachable, and the materials of different magnetic strip segments 131 can be different. The material of the magnetic strip 13 can be adjusted by installing / removing / replacing different magnetic strip segments 131.

[0066] As can be seen from the above, the magnetic strip 13 of the integrated inductor 10 provided in this application can be flexibly adjusted to change the shape and parameters of the overall magnetic field. During the testing phase, staff can test multiple performance parameters using only one integrated inductor 10, increasing the flexibility of testing and reducing testing costs.

[0067] In some embodiments, after the testing phase, the final position, final size and final material of the magnetic strip 13 can be determined based on the obtained optimal parameters, and then it can be fixed on the main magnetic core 11 for mass production.

[0068] A portion of the magnetic strip 13 is wrapped with a first insulating material, and a portion of the main magnetic core 11 is wrapped with a second insulating material. The first and second insulating materials are fixedly connected to fix the magnetic strip 13 to the main magnetic core 11. The fixed connection includes at least an adhesive connection.

[0069] In some embodiments, see Figure 1 The main magnetic core 11 is elliptical, and the long side of the ellipse extends along the first direction; multiple coil windings 12 are wound around the long side of the main magnetic core 11, and the multiple coil windings 12 are arranged along the first direction; the magnetic strip 13 extends in a straight line, and the magnetic strip 13 extends along the first direction and penetrates the hollow part of the multiple coil windings 12.

[0070] In this way, the main magnetic core 11 occupies a relatively small volume, and multiple coil windings 12 are arranged adjacent to each other in one direction, thereby better stabilizing the magnetic strip 13. That is, the magnetic strip 13 can be well stabilized between the main magnetic core 11 and the coil windings 12 even without the aid of other connectors or connection methods, thus allowing for better adjustment of the magnetic strip 13.

[0071] In other embodiments, please refer to Figure 10The main magnetic core 11 is elliptical, and the long side of the ellipse extends along the first direction; multiple coil windings 12 are wound around the long side of the main magnetic core 11, and the multiple coil windings 12 are arranged along the first direction; the magnetic strip 13 extends in a straight line, and the magnetic strip 13 extends along the first direction and penetrates the hollow part of the multiple coil windings 12, so as to better adapt to the installation requirements of different converters.

[0072] In some other embodiments, please refer to Figure 11 The main magnetic core 11 is rectangular; the first coil winding 12 is wound on one side of the main magnetic core 11, and the second coil winding 12 is wound on the other side of the main magnetic core 11, with the first coil winding 12 and the second coil winding 12 facing each other; the magnetic strip 13 is U-shaped and passes through the hollow part of multiple coil windings 12, which can better adapt to the installation requirements of different converters.

[0073] In summary, this application, on the one hand, integrates a differential-mode inductor onto a common-mode inductor by adding a magnetic stripe 13 to form a leakage magnetic circuit, thereby possessing both large inductance common-mode and small inductance differential-mode characteristics. The common-mode inductance of integrated inductor 10 has an inductance greater than 100 microfarads, generally around several hundred microfarads. When applied to a three-phase inverter (a type of converter), since the vector sum of the power frequency currents in the three-phase inverter is 0, it cancels out in the common-mode main magnetic flux, resulting in no obstruction. However, for the common-mode portion where the current sum of the three phases is not 0, it is obstructed by the large inductance. Meanwhile, the differential-mode inductance of integrated inductor 10 has an inductance less than 10 microfarads, generally around several microfarads, which is used to suppress the parallel circulating current of the three-phase inverter, greatly improving manufacturability and saving 200 yuan in cost. On the other hand, the position, size, and shape of magnetic strip 13 can all be adjusted, allowing for convenient and flexible design verification during the design phase until ideal production parameters are obtained, reducing debugging costs and increasing debugging efficiency.

[0074] In another embodiment of this application, please refer to Figure 12 This is a flowchart illustrating a method of using an integrated inductor 10 according to an embodiment of this application. Please refer to... Figure 12 The method is applied to the aforementioned miniaturized integrated inductor 10, and the method includes:

[0075] S21: During the design phase, the magnetic strip 13 and the main magnetic core 11 in the integrated inductor 10 are connected in an active manner, allowing the position of the magnetic strip 13 relative to the main magnetic core 11 to be changed based on preset position parameters, the size of the magnetic strip 13 to be changed based on preset size parameters, and the material of the magnetic strip 13 to be adjusted based on preset material parameters, so as to generate the integrated inductor 10 to be tested.

[0076] S22: During the verification phase, the integrated inductor 10 to be tested is subjected to performance tests until the optimal location parameters, optimal size parameters, and optimal material parameters are determined.

[0077] Following step S22, the method further includes:

[0078] S23: During the assembly stage, based on the optimal position parameters, optimal size parameters and optimal material parameters, the magnetic strip 13 is fixed on the main magnetic core 11 and the integrated inductor 10 is encapsulated in the inductor box.

[0079] Here, the magnetic strip 13 can be fixed to the main magnetic core 11 by glue.

[0080] In this way, since the position, size, and shape of the magnetic strip 13 are all adjustable, the magnetic field parameters of the integrated inductor 10 can be adjusted to the required method during the design phase. The adjusted integrated inductor 10 can then be tested. After multiple tests, the optimal test results can be obtained, determining the optimal position parameters, optimal size parameters, and optimal material parameters. In other words, using the integrated inductor 10 provided in this application, testers can conveniently and flexibly perform design verification until ideal production parameters are obtained, reducing debugging costs while increasing debugging efficiency.

[0081] In another embodiment of this application, please refer to Figure 13 This is a schematic diagram of the structure of a converter 30 provided in an embodiment of this application. Please refer to... Figure 13 The converter 30 includes the aforementioned miniaturized integrated inductor 10.

[0082] It should be noted that converter 30 can be an inverter, rectifier, etc.

[0083] The above are merely preferred embodiments of this application and are not intended to limit the scope of protection of this application. It should be noted that in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. The sequence numbers of the above embodiments of this application are merely descriptive and do not represent the superiority or inferiority of the embodiments. The methods disclosed in the several method embodiments provided in this application can be arbitrarily combined to obtain new method embodiments without conflict. The features disclosed in the several product embodiments provided in this application can be arbitrarily combined to obtain new product embodiments without conflict. The features disclosed in the several method or device embodiments provided in this application can be arbitrarily combined to obtain new method or device embodiments without conflict. The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A miniaturized integrated inductor, characterized in that, The integrated inductor comprises a main magnetic core and a plurality of coil windings wound on the main magnetic core, and the plurality of coil windings are used to provide common mode inductance; The integrated inductor further comprises a magnetic strip, the magnetic strip passes through the hollow part of the coil winding, and the magnetic strip is used to provide differential mode inductance; Wherein, the position of the magnetic strip relative to the main magnetic core, and / or the size of the magnetic strip, and / or the material of the magnetic strip is allowed to be adjusted to change the magnetic field of the integrated inductor; The magnetic strip and the main magnetic core are movably connected to allow the magnetic strip to move relative to the main magnetic core; The diameter of the hollow part of the coil winding-the thickness value of the magnetic strip-the thickness value of the main magnetic core=first value, the first value makes the magnetic strip rely on gravity and friction to stabilize between the coil winding and the main magnetic core, to realize the movable connection between the magnetic strip and the main magnetic core.

2. The integrated inductor according to claim 1, wherein A plurality of protrusions are present on the surface of the magnetic strip to increase the friction between the magnetic strip and the coil winding and between the magnetic strip and the main magnetic core; And / or, A plurality of protrusions are present on the surface of the coil winding close to the magnetic strip to increase the friction between the magnetic strip and the coil winding; And / or, A plurality of protrusions are present on the surface of the main magnetic core close to the magnetic strip to increase the friction between the magnetic strip and the main magnetic core.

3. The integrated inductor according to claim 1, wherein The integrated inductor further comprises a movable connecting piece, the magnetic strip is connected to the main magnetic core through the movable connecting piece, or the magnetic strip is connected to the coil winding through the movable connecting piece; Wherein, the movable connecting piece at least includes: buckle, snap spring, elastic retainer.

4. The integrated inductor according to any one of claims 1-3, wherein The magnetic strip comprises a plurality of independent magnetic strip segments, and adjacent magnetic strip segments are detachably connected; Wherein, the shape and / or material of different magnetic strip segments are different, and the detachable connection at least includes: threaded connection, buckle connection and hinge connection.

5. The integrated inductor according to claim 1, wherein Part of the position of the magnetic strip is wrapped by a first insulating material, part of the position of the main magnetic core is wrapped by a second insulating material, and the first insulating material and the second insulating material are fixedly connected to fix the magnetic strip on the main magnetic core; The fixed connection at least includes glue connection.

6. The integrated inductor of claim 1, wherein, The main magnetic core is elliptical, and the long side of the elliptical shape extends along a first direction; A plurality of coil windings are wound on the long side of the main magnetic core, and a plurality of coil windings are arranged along the first direction; The magnetic strip extends in a straight line, and the magnetic strip extends along the first direction and penetrates the hollow part of a plurality of coil windings.

7. A method of using an integrated inductor, comprising: It is applied to the miniaturized integrated inductor of any one of claims 1-6; the method comprises: In the design stage, the magnetic strip in the integrated inductor is movably connected to the main magnetic core, allowing the position of the magnetic strip relative to the main magnetic core to be changed based on preset position parameters, the size of the magnetic strip to be changed based on preset size parameters, and the material of the magnetic strip to be adjusted based on preset material parameters, so as to generate the integrated inductor to be tested; In the verification stage, the integrated inductor to be tested is subjected to performance testing until the optimal position parameters, the optimal size parameters, and the optimal material parameters are determined; In the assembly stage, based on the optimal position parameters, the optimal size parameters, and the optimal material parameters, the magnetic strip is fixed on the main magnetic core, and the integrated inductor is packaged in an inductor box.

8. A current transformer, characterized by The current transformer comprises an inductor box, and the inductor box comprises the miniaturized integrated inductor according to any one of claims 1-6.

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