Common-mode and differential-mode inductor integrated structure

Abstract

The utility model discloses a common-mode and differential-mode inductor integrated structure which comprises a magnetic core structure and a coil structure, the magnetic core structure comprises a first magnetic core and a plurality of second magnetic cores, at least one of the second magnetic cores and the first magnetic core form annular magnetic flux, the coil structure comprises a common-mode coil and a differential-mode coil, and the common-mode coil and the differential-mode coil form annular magnetic flux. The common-mode coil comprises a plurality of first coils, the plurality of first coils are all wound on the first magnetic core, the differential-mode coil comprises a plurality of second coils, the number of the second coils is consistent with that of the second magnetic cores, the plurality of second coils are respectively wound on the plurality of second magnetic cores, and the plurality of second coils are respectively wound on the plurality of second magnetic cores. The winding directions of the first coils are the same, and the winding directions of the second coils are the same; the common-mode inductor and the differential-mode inductor are integrally arranged, the space occupied by the common-mode inductor and the differential-mode inductor can be effectively reduced, compared with the prior art, the integrated arrangement can save manufacturing materials of the magnetic core structure, and therefore the manufacturing cost is saved.

Description

Technical Field

[0001] This application relates to the field of inductor technology, and in particular to an integrated structure of common-mode and differential-mode inductors. Background Technology

[0002] With the rapid development of power electronics technology, the market's pursuit of integration and miniaturization has led to higher requirements for magnetic devices, necessitating smaller size and more efficient space utilization. AFE (Automatic External Filter) rectifier / inverter units are used in fields such as photovoltaics and energy storage. Common-mode and differential-mode inductors are required before and after the AFE unit to improve the voltage waveform in the circuit and meet its operational requirements.

[0003] The current practice is to design common-mode inductors and differential-mode inductors separately according to the required performance of the circuit, such as Figure 6 As shown, this is a topology circuit using existing common-mode and differential-mode inductors. From left to right, the DC source generated by photovoltaic silicon panels or DC motors is improved by feedback capacitors and common-mode inductors, and then inverted into AC by AFE unit. The AC voltage is improved by differential-mode inductors, filter capacitors and grid-side inductors, boosted and sent to the grid. From right to left, the AC power stepped down by the grid is rectified into DC by AFE unit, improved by differential-mode inductors, common-mode inductors and capacitors, and finally sent to DC equipment or battery energy storage.

[0004] Existing common-mode and differential-mode inductor structures, due to the separate placement of the common-mode and differential-mode inductors, occupy a large volume and have a high overall cost. Driven by miniaturization and integration, integrated common-mode and differential-mode inductor structures have emerged. Utility Model Content

[0005] The main purpose of this application is to propose an integrated common-mode and differential-mode inductor structure, which aims to solve the problems of large size and high cost of existing common-mode and differential-mode inductor structures.

[0006] To achieve the above objectives, the present application proposes an integrated common-mode and differential-mode inductor structure, comprising: a magnetic core structure and a coil structure. The magnetic core structure includes a first magnetic core and a plurality of second magnetic cores, at least one of which forms a closed loop with the first magnetic core. The coil structure includes a common-mode coil and a differential-mode coil. The common-mode coil includes a plurality of first coils, all wound around the first magnetic core. The differential-mode coil includes a plurality of second coils, the number of which is the same as the number of second magnetic cores. The plurality of second coils are wound around the plurality of second magnetic cores respectively, and the winding directions of the plurality of first coils and the plurality of second coils are the same.

[0007] Optionally, the first magnetic core and the plurality of second magnetic cores are integrally formed.

[0008] Optionally, the magnetic core structure consists of a first magnetic core and three second magnetic cores, wherein the number of first coils is two and the number of second coils is three.

[0009] Optionally, the outer side of the coil structure is covered with an insulating coating, the thickness of which is 0.1-0.5 mm.

[0010] Optionally, the distances between the plurality of second magnetic cores and the first magnetic core are arranged in order from near to far, and the plurality of second magnetic cores form a closed loop magnetic flux with the first magnetic core.

[0011] Optionally, the magnetic core structure is made of silicon steel sheet or amorphous ribbon.

[0012] Optionally, the cross-sections of the first magnetic core, the second magnetic core, and their connection points are all rectangular structures.

[0013] Optionally, the arrangement direction of the plurality of second magnetic cores is perpendicular to the direction of the first magnetic core, and one of the plurality of second magnetic cores forms a closed annular magnetic flux with the first magnetic core.

[0014] Optionally, the magnetic core structure is made of one of the following materials: iron-silicon, iron-silicon-aluminum, ferrite, or iron powder core.

[0015] This application's technical solution incorporates a magnetic core structure and a coil structure. The magnetic core structure includes a first magnetic core and multiple second magnetic cores, with at least one of the second magnetic cores forming a ring-shaped magnetic flux with the first magnetic core. The coil structure includes a common-mode coil and a differential-mode coil. The common-mode coil includes multiple first coils wound around the first magnetic core, and the differential-mode coil includes multiple second coils wound around the multiple second magnetic cores. By winding both the common-mode and differential-mode coils on the same magnetic core structure, the common-mode and differential-mode inductors achieve good filtering performance while being integrated. This facilitates the miniaturization of the common-mode and differential-mode inductors, effectively reducing their space requirements. Compared to existing technologies, this integrated design saves on materials used in the magnetic core structure, thereby reducing manufacturing costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of the structure of the first embodiment of the integrated common-mode and differential-mode inductor structure of this application;

[0018] Figure 2 This is one of the schematic diagrams of the first embodiment of the integrated common-mode and differential-mode inductor structure of this application;

[0019] Figure 3 This is the second schematic diagram of the first embodiment of the integrated common-mode and differential-mode inductor structure of this application;

[0020] Figure 4 This is a schematic diagram of the structure of the second embodiment of the integrated common-mode and differential-mode inductor structure of this application;

[0021] Figure 5 This is a schematic diagram of a second embodiment of the integrated common-mode and differential-mode inductor structure of this application;

[0022] Figure 6 This is a schematic diagram showing the use of existing common-mode and differential-mode inductors in a circuit topology.

[0023] Explanation of icon numbers:

[0024] 1. Magnetic core structure; 110. First magnetic core; 120. Second magnetic core; 2. Coil structure; 210. First coil; 220. Second coil.

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0030] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0031] With the rapid development of power electronics technology, the market's pursuit of integration and miniaturization has led to higher requirements for magnetic devices, necessitating smaller size and more efficient space utilization. AFE (Automatic External Filter) rectifier / inverter units are used in fields such as photovoltaics and energy storage. Common-mode and differential-mode inductors are required before and after the AFE unit to improve the voltage waveform in the circuit and meet its operational requirements.

[0032] The current practice is to design common-mode inductors and differential-mode inductors separately according to the required performance of the circuit, such as Figure 6As shown, this is a topology circuit using existing common-mode and differential-mode inductors. From left to right, the DC source generated by photovoltaic silicon panels or DC motors is improved by feedback capacitors and common-mode inductors, and then inverted into AC by AFE unit. The AC voltage is improved by differential-mode inductors, filter capacitors and grid-side inductors, boosted and sent to the grid. From right to left, the AC power stepped down by the grid is rectified into DC by AFE unit, improved by differential-mode inductors, common-mode inductors and capacitors, and finally sent to DC equipment or battery energy storage.

[0033] Existing common-mode and differential-mode inductor structures, due to the separate placement of the common-mode and differential-mode inductors, occupy a large volume and have a high overall cost. Driven by miniaturization and integration, integrated common-mode and differential-mode inductor structures have emerged.

[0034] In view of this, this application proposes an integrated structure for common-mode and differential-mode inductors.

[0035] In the embodiments of this application, reference is made to Figures 1 to 5 The aforementioned integrated common-mode and differential-mode inductor structure includes: a magnetic core structure 1 and a coil structure 2. The magnetic core structure 1 includes a first magnetic core 110 and multiple second magnetic cores 120, at least one of the multiple second magnetic cores 120 forming a closed loop with the first magnetic core 110. The coil structure 2 includes a common-mode coil and a differential-mode coil. The common-mode coil includes multiple first coils 210, all wound around the first magnetic core 110. The differential-mode coil includes multiple second coils 220, the number of which is the same as the number of second magnetic cores 120. The first coils 210 and the second coils 220 are wound on multiple second magnetic cores 120 respectively. The winding directions of the multiple first coils 210 and the multiple second coils 220 are the same. By winding both the common-mode coil and the differential-mode coil on the same magnetic core structure 1, the common-mode inductor and the differential-mode inductor can be integrated while having a good filtering effect. This is beneficial for the miniaturization design of the common-mode inductor and the differential-mode inductor, and can effectively reduce the space occupied by the common-mode inductor and the differential-mode inductor. Compared with the prior art, the integrated setting can save the manufacturing materials of the magnetic core structure 1, thereby saving manufacturing costs.

[0036] refer to Figure 1 and Figure 4 The first magnetic core 110 and multiple second magnetic cores 120 are integrally formed, making the overall structure of the magnetic core structure 1 more stable and better ensuring the service life of the magnetic core structure 1.

[0037] refer to Figure 1 and Figure 4The magnetic core structure 1 consists of a first magnetic core 110 and three second magnetic cores 120. There are two first coils 210 and three second coils 220. That is, the common mode inductor is two-phase, which is convenient for connection with two-phase electricity, and the differential mode inductor is three-phase, which is convenient for connection with three-phase electricity.

[0038] To ensure insulation of the coil structure 2, an insulating coating is uniformly applied to the outer side of the coil structure 2. The thickness of the insulating coating is 0.1-0.5mm, which ensures that the coil structure 2 is insulated while also making the thickness of the insulating coating more uniform.

[0039] refer to Figure 1 , Figure 2 and Figure 3 In the first embodiment of this solution, multiple second magnetic cores 120 are arranged in order of increasing distance from the first magnetic core 110, forming a flat structure suitable for use in flat spaces. Each of the multiple second magnetic cores 120 forms a closed loop of magnetic flux with the first magnetic core 110. The magnetic flux is a continuous and closed loop of magnetic lines of force generated after the common mode coil is energized. The magnetic flux is densest on the first magnetic core 110 where the common mode coil is located, and the magnetic flux gradually becomes sparser on the second magnetic cores 120 as the distance between them and the first magnetic core 110 increases.

[0040] Specifically, the magnetic core structure 1 is a structure made of silicon steel sheets or amorphous ribbon. The silicon steel sheets have advantages such as high saturation magnetic flux density, good magnetic permeability, easy production and processing, and high stability. The amorphous ribbon has the characteristics of high magnetic permeability, low loss, excellent frequency characteristics, high saturation magnetic induction intensity, and good temperature stability.

[0041] refer to Figure 1 The cross-section of the first magnetic core 110, the second magnetic core 120, and their connection is preferably rectangular, which facilitates processing and manufacturing and reduces manufacturing costs. The cross-section can also be circular, elliptical, prismatic, or other shapes.

[0042] refer to Figure 4 and Figure 5 In the second embodiment of this solution, the arrangement direction of the plurality of second magnetic cores 120 is perpendicular to the arrangement direction of the first magnetic core 110, forming a T-shaped structure. One of the plurality of second magnetic cores 120 forms a closed annular magnetic flux with the first magnetic core 110. Its structure is relatively compact and occupies less space.

[0043] Specifically, the magnetic core structure 1 is made of one of the following materials: iron-silicon, iron-silicon-aluminum, ferrite, or iron powder core, and has good magnetic stability.

[0044] This application's technical solution incorporates a magnetic core structure and a coil structure. The magnetic core structure includes a first magnetic core and multiple second magnetic cores, with at least one of the second magnetic cores forming a ring-shaped magnetic flux with the first magnetic core. The coil structure includes a common-mode coil and a differential-mode coil. The common-mode coil includes multiple first coils wound around the first magnetic core, and the differential-mode coil includes multiple second coils wound around the multiple second magnetic cores. By winding both the common-mode and differential-mode coils on the same magnetic core structure, the common-mode and differential-mode inductors achieve good filtering performance while being integrated. This facilitates the miniaturization of the common-mode and differential-mode inductors, effectively reducing their space requirements. Compared to existing technologies, this integrated design saves on materials used in the magnetic core structure, thereby reducing manufacturing costs.

[0045] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A common-mode and differential-mode inductor integrated structure, characterized in that, include: The magnetic core structure includes a first magnetic core and a plurality of second magnetic cores, at least one of which forms a closed loop with the first magnetic core. The coil structure includes a common-mode coil and a differential-mode coil. The common-mode coil includes a plurality of first coils wound around the first magnetic core. The differential-mode coil includes a plurality of second coils, the number of which is the same as the number of second magnetic cores. The plurality of second coils are wound around the plurality of second magnetic cores respectively. The winding directions of the plurality of first coils and the plurality of second coils are the same.

2. The integrated common-mode and differential-mode inductor structure as described in claim 1, characterized in that, The first magnetic core and the plurality of second magnetic cores are integrally formed.

3. The integrated common-mode and differential-mode inductor structure as described in claim 2, characterized in that, The magnetic core structure consists of a first magnetic core and three second magnetic cores, with two first coils and three second coils.

4. The integrated common-mode and differential-mode inductor structure as described in claim 1, characterized in that, The outer side of the coil structure is covered with an insulating coating, the thickness of which is 0.1-0.5 mm.

5. The integrated common-mode and differential-mode inductor structure as described in claim 1, characterized in that, The distances between the plurality of second magnetic cores and the first magnetic core are arranged in order from near to far, and the plurality of second magnetic cores form a closed loop magnetic flux with the first magnetic core.

6. The integrated common-mode and differential-mode inductor structure as described in claim 5, characterized in that, The magnetic core structure is made of silicon steel sheets or amorphous ribbon.

7. The integrated common-mode and differential-mode inductor structure as described in claim 1, characterized in that, The cross-sections of the first magnetic core, the second magnetic core, and their connection points are all rectangular.

8. The integrated common-mode and differential-mode inductor structure as described in claim 1, characterized in that, The arrangement of the plurality of second magnetic cores is perpendicular to the direction of the first magnetic core, and one of the plurality of second magnetic cores forms a closed loop magnetic flux with the first magnetic core.

9. The integrated common-mode and differential-mode inductor structure as described in claim 8, characterized in that, The magnetic core structure is made of one of the following materials: iron-silicon, iron-silicon-aluminum, ferrite, or iron powder core.

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