CN221529652U - Integrated inductor, circuit assembly and inverter - Google Patents

Abstract

The present application discloses an integrated inductor, a circuit component and an inverter, which belongs to the field of inductors. The integrated inductor includes: a first magnetic core, a second magnetic core, a third magnetic core and a plurality of windings; the first magnetic core is wrapped around the outer ring of the second magnetic core, and the second magnetic core is spaced apart from the first magnetic core; each turn of each winding is wound around the first magnetic core and the second magnetic core, and any two windings are spaced apart, and a common mode inductor is formed between each winding and the first magnetic core; there is no winding wound on the third magnetic core, and a closed magnetic path is formed between the area on the second magnetic core where the winding is wound and the third magnetic core, and a differential mode inductor is formed between each winding and the third magnetic core. The present application can avoid magnetic core saturation, shorten the air path through which the leakage magnetic flux passes, and increase the inductance value of the integrated inductor without increasing the volume of the integrated inductor.

Description

Integrated inductors, circuit components and inverters

Technical Field

The present application belongs to the field of inductors, and in particular to an integrated inductor, a circuit component and an inverter.

Background Art

In the related art, in the common-mode inductor of a high-power inverter, many differential common-mode integration solutions have been produced due to the good symmetry and large available space of the toroidal core.

The principle of the differential and common-mode integration solution is to add additional magnetic cores to provide a path for the differential-mode magnetic lines of force. At the same time, due to the air gap between the magnetic cores, the common-mode magnetic lines of force still flow along the original path, thereby increasing the differential-mode component without affecting the common-mode inductance, thereby achieving the purpose of differential and common-mode integration.

The above differential and common mode integration solution has the following problems: due to space limitations, the cross-sectional area of the additional magnetic strip is small, and the inductance value of the magnetic strip is low, resulting in the inductance value of the differential and common mode integration solution failing to meet the design requirements.

Utility Model Content

The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an integrated inductor, a circuit component and an inverter, which can increase the inductance value of the integrated inductor without increasing the volume of the integrated inductor.

In a first aspect, the present application provides an integrated inductor, comprising:

a first magnetic core;

A second magnetic core, wherein the first magnetic core surrounds an outer ring of the second magnetic core, and the second magnetic core is spaced apart from the first magnetic core;

A plurality of windings, each turn of each winding is wound around the first magnetic core and the second magnetic core, and any two windings are spaced apart, so that a common mode inductor is formed between the plurality of windings and the first magnetic core;

A third magnetic core, on which no winding is wound, a closed magnetic path is formed between the area on the second magnetic core on which the winding is wound and the third magnetic core, and a differential mode inductance is formed between each of the windings and the closed magnetic path.

According to the integrated inductor provided in the embodiment of the present application, on the one hand, by providing a first magnetic core and a second magnetic core, and the first magnetic core is wrapped around the outer ring of the second magnetic core, the differential and common mode magnetic circuits can be separated to a certain extent. The first magnetic core mainly provides a common mode component, and the second magnetic core mainly provides a differential mode component. Compared with the related art in which the same magnetic core provides both a common mode component and a differential mode component, the cross-sectional area of the magnetic core is increased, thereby increasing the paths of the differential mode magnetic lines of force and the common mode magnetic lines of force, making it difficult for the first magnetic core and the second magnetic core to saturate, thereby improving the common mode inductance of the first magnetic core and the differential mode inductance of the second magnetic core; on the other hand, by providing a third magnetic core, a closed magnetic path is formed between the third magnetic core and the area on the second magnetic core where the winding is wound, so that the air path through which the leakage magnetic flux passes becomes shorter. After the air gap in the magnetic circuit is reduced, the air magnetic resistance is reduced, and the differential mode magnetic flux is increased, thereby further improving the inductance value of the integrated inductor.

According to an embodiment of the present application, the third magnetic core includes a plurality of ends, the plurality of ends extend toward the first magnetic core and the second magnetic core, and at least one of the ends is distributed on a side surface of the winding;

The area on the second magnetic core between the ends on both sides of any one of the windings forms a closed magnetic path with the third magnetic core.

According to one embodiment of the present application, the multiple end portions are all located in the inner circle of the second magnetic core, and there is an air gap between the multiple end portions and the inner peripheral wall of the second magnetic core.

According to one embodiment of the present application, the extension arm is arranged at the end and extends in a direction close to the first magnetic core. The extension arm is distributed on the side of the second magnetic core along the thickness direction of the second magnetic core, and the extension arm at least partially overlaps with the projection of the second magnetic core along the thickness direction of the second magnetic core.

According to one embodiment of the present application, the extension arm is arranged at the end portion and extends in a direction close to the outer peripheral wall of the first magnetic core. Along the thickness direction of the second magnetic core, the extension arm is distributed on the sides of the second magnetic core and the first magnetic core. The extension arm partially overlaps with the projection of the second magnetic core along the thickness direction of the second magnetic core, and the extension arm at least partially overlaps with the projection of the first magnetic core along the thickness direction of the second magnetic core.

According to one embodiment of the present application, each of the plurality of windings has the same number of coil turns, and each of the plurality of windings has the same winding direction.

According to an embodiment of the present application, the first magnetic core and the second magnetic core are both closed ring-shaped, and the outer circumferential wall of the second magnetic core is spaced equidistant from the inner circumferential wall of the first magnetic core at all locations.

According to an embodiment of the present application, along the thickness direction of the first magnetic core, the height of the third magnetic core is less than or equal to the height of the winding.

According to one embodiment of the present application, the first magnetic core and the second magnetic core are both in a closed annular shape, and the plurality of windings are spaced and distributed along the circumference of the annular shape;

Each of the ends of the third magnetic core is located between two adjacent windings, and the area on the second magnetic core where any of the windings are wound forms a closed magnetic path with the corresponding area of the third magnetic core, wherein the corresponding area of the third magnetic core is the area between the two ends on both sides of the winding.

According to one embodiment of the present application, the winding includes three;

The third magnetic core includes three sections distributed along the circumferential direction, the radial inner ends of the three sections are connected to the same position, and the radial outer ends of the three sections are located between two adjacent windings;

The area on the second magnetic core where any of the windings are wound forms a closed magnetic path with two of the three sections located on both sides of the winding.

According to one embodiment of the present application, the third magnetic core includes a plurality of arc-shaped magnetic cores, each of the arc-shaped magnetic cores includes two ends;

The two ends of the arc-shaped magnetic core are respectively located at two sides of the winding, and the area of the second magnetic core where the winding is wound forms a closed magnetic path with the arc-shaped magnetic core.

According to an embodiment of the present application, the first magnetic core and the second magnetic core each include a first side and a second side that are oppositely disposed, the first side and the second side are enclosed to form a closed shape, and the plurality of windings are wound on one of the first sides;

The third magnetic core comprises a plurality of strip-shaped magnetic cores arranged at intervals, wherein the strip-shaped magnetic cores extend toward the two first sides and are located between two adjacent windings;

The strip magnetic core and the adjacent second side and the area on the first side between the second side and the strip magnetic core form a closed magnetic path; the adjacent two strip magnetic cores and the area on the first side between the two strip magnetic cores form a closed magnetic path.

According to one embodiment of the present application, at least a portion of the strip magnetic core is located in the inner circle of the second magnetic core.

According to one embodiment of the present application, the strip magnetic core is distributed on the side of the second magnetic core along the thickness direction of the second magnetic core, the projection of the strip magnetic core and the second magnetic core along the thickness direction of the second magnetic core partially overlap, and the projection of the strip magnetic core and the first magnetic core along the thickness direction of the second magnetic core at least partially overlap.

In a second aspect, the present application provides an inverter, comprising: any one of the above-mentioned integrated inductors.

According to the inverter provided by the embodiment of the present application, on the one hand, by setting the first magnetic core and the second magnetic core, and the first magnetic core is surrounded by the outer ring of the second magnetic core, the differential and common mode magnetic circuits can be separated to a certain extent. The first magnetic core mainly provides common mode components, and the second magnetic core mainly provides differential mode components. Compared with the related art in which the same magnetic core provides both common mode components and differential mode components, the cross-sectional area of the magnetic core is increased, thereby increasing the paths of differential mode magnetic lines of force and common mode magnetic lines of force, making the first magnetic core and the second magnetic core less likely to saturate, thereby increasing the common mode inductance of the first magnetic core and the differential mode inductance of the second magnetic core; on the other hand, by setting the third magnetic core, a closed magnetic path is formed between the third magnetic core and the area on the second magnetic core where the winding is wound, so that the air path through which the leakage magnetic flux passes becomes shorter. After the air gap in the magnetic circuit is reduced, the air magnetic resistance is reduced, and the differential mode magnetic flux is increased, thereby further improving the inductance value of the integrated inductor.

In a second aspect, the present application provides a circuit component, the inverter comprising: any one of the above-mentioned integrated inductors.

According to the inverter provided by the embodiment of the present application, on the one hand, by setting the first magnetic core and the second magnetic core, and the first magnetic core is surrounded by the outer ring of the second magnetic core, the differential and common mode magnetic circuits can be separated to a certain extent. The first magnetic core mainly provides common mode components, and the second magnetic core mainly provides differential mode components. Compared with the related art in which the same magnetic core provides both common mode components and differential mode components, the cross-sectional area of the magnetic core is increased, thereby increasing the paths of differential mode magnetic lines of force and common mode magnetic lines of force, making the first magnetic core and the second magnetic core less likely to saturate, thereby increasing the common mode inductance of the first magnetic core and the differential mode inductance of the second magnetic core; on the other hand, by setting the third magnetic core, a closed magnetic path is formed between the third magnetic core and the area on the second magnetic core where the winding is wound, so that the air path through which the leakage magnetic flux passes becomes shorter. After the air gap in the magnetic circuit is reduced, the air magnetic resistance is reduced, and the differential mode magnetic flux is increased, thereby further improving the inductance value of the integrated inductor.

Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 is a schematic diagram of a structure of an integrated inductor provided in an embodiment of the present application;

FIG2 is a second schematic diagram of the structure of an integrated inductor provided in an embodiment of the present application;

FIG3 is a third schematic diagram of the structure of an integrated inductor provided in an embodiment of the present application;

FIG4 is a fourth schematic diagram of the structure of an integrated inductor provided in an embodiment of the present application;

FIG5 is one of the internal magnetic flux schematic diagrams of the integrated inductor provided in an embodiment of the present application;

FIG6 is a fifth structural diagram of an integrated inductor provided in an embodiment of the present application;

FIG. 7 is a sixth structural diagram of an integrated inductor provided in an embodiment of the present application;

FIG8 is a left side view of the integrated inductor in FIG7;

FIG9 is a seventh schematic diagram of the structure of an integrated inductor provided in an embodiment of the present application;

FIG10 is a left side view of the integrated inductor in FIG9;

FIG11 is a second schematic diagram of the internal magnetic flux of the integrated inductor provided in an embodiment of the present application;

FIG12 is a schematic diagram of the internal magnetic flux of a toroidal common mode inductor in the related art;

FIG. 13 is a schematic diagram of a differential-mode equivalent magnetic circuit structure of an integrated inductor provided in an embodiment of the present application.

Reference numerals:

A first magnetic core 1 , a second magnetic core 2 , a third magnetic core 3 , an extended arm 31 , an arc-shaped magnetic core 32 , and a winding 4 .

DETAILED DESCRIPTION

The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

The integrated inductor, circuit assembly, and inverter according to the embodiments of the present application are described below with reference to FIGS. 1 to 11 .

It should be understood that the integrated inductor of the present application can be applied to a converter, a filter circuit, or other circuits, and the present application does not limit this.

As shown in FIG. 1 , the integrated inductor according to the embodiment of the present application includes: a first magnetic core 1 , a second magnetic core 2 , a third magnetic core 3 and a plurality of windings 4 .

The first magnetic core 1 is wrapped around the outer ring of the second magnetic core 2, and the second magnetic core 2 is spaced apart from the first magnetic core 1; each turn of each winding 4 is wound around the first magnetic core 1 and the second magnetic core 2, and any two windings 4 are spaced apart, and a common-mode inductance is formed between the multiple windings 4 and the first magnetic core 1; the third magnetic core 3 is not wound with windings 4, and a closed magnetic path is formed between the area of the second magnetic core 2 where the windings 4 are wound and the third magnetic core 3, and a differential-mode inductance is formed between each winding 4 and the closed magnetic path.

Among them, the second magnetic core 2 is arranged in the inner circle of the first magnetic core 1, and there is an air gap between the outer wall of the second magnetic core 2 and the inner wall diameter of the first magnetic core 1. The first magnetic core 1 is mainly used to provide common mode inductance, and the second magnetic core 2 is mainly used to provide differential mode inductance.

A common mode inductor is formed between at least two windings 4 and the first magnetic core 1 . As shown in FIG. 1 , a common mode inductor is formed between three windings 4 and the first magnetic core 1 .

The third magnetic core 3 and at least a part of the second magnetic core 2 form a closed magnetic path. A group of windings 4 are arranged in the closed magnetic path. A differential mode inductance is formed between each winding 4 and the closed magnetic path.

Among them, the third magnetic core 3 can be arranged in the inner circle of the second magnetic core 2; or, the third magnetic core 3 can also be arranged on the side of the second magnetic core 2; or, the third magnetic core 3 can also be arranged on the side of the second magnetic core 2 and the first magnetic core 1; or, the third magnetic core 3 can also be partially arranged in the inner circle of the second magnetic core 2 and partially arranged on the side of the second magnetic core 2; or, the third magnetic core 3 can also be partially arranged in the inner circle of the second magnetic core 2 and partially arranged on the side of the second magnetic core 2 and the first magnetic core 1.

There is an air gap between any two of the third magnetic core 3, the second magnetic core 2 and the first magnetic core 1, and the air gap can be filled with at least one of an insulating colloid, a solid insulating frame and a solid insulating board to achieve insulation and fixation between any two of the third magnetic core 3, the second magnetic core 2 and the first magnetic core 1.

The plurality of windings 4 may be two or three. When there are two windings 4, the integrated inductor is a two-phase difference common mode integration, and when there are three windings 4, the integrated inductor is a three-phase difference common mode integration.

In the related technology, many differential and common mode integration solutions have been produced due to the good symmetry and large available space of the annular magnetic core. The principle of the differential and common mode integration solution is to provide a path for the differential mode magnetic lines of force by adding additional magnetic cores. At the same time, due to the air gap, the common mode magnetic lines of force still flow along the original path, thereby increasing the differential mode component without affecting the common mode inductance, thereby achieving the purpose of differential and common mode integration.

Due to space limitations, the additional magnetic strips are relatively thin, and the increase in differential mode inductance is limited. If the Y-shaped magnetic strips are thickened, the differential mode inductance will increase, which will easily cause local saturation of the core, resulting in a decrease in the magnetic permeability of the core and a decrease in the common mode inductance, which will not meet the design requirements.

According to the integrated inductor provided in the embodiment of the present application, on the one hand, by providing the first magnetic core 1 and the second magnetic core 2, and the first magnetic core 1 is surrounded by the outer ring of the second magnetic core 2, the differential and common mode magnetic circuits can be separated to a certain extent. The first magnetic core 1 mainly provides the common mode component, and the second magnetic core 2 mainly provides the differential mode component. Compared with the related art in which the same magnetic core provides both the common mode component and the differential mode component, the cross-sectional area of the magnetic core is increased, thereby increasing the paths of the differential mode magnetic lines of force and the common mode magnetic lines of force, making the first magnetic core 1 and the second magnetic core 2 less likely to saturate, thereby improving the common mode inductance of the first magnetic core 1 and the differential mode inductance of the second magnetic core 2; on the other hand, by providing the third magnetic core 3, a closed magnetic path is formed between the third magnetic core 3 and the area on the second magnetic core 2 where the winding 4 is wound, so that the air path through which the leakage magnetic flux passes becomes shorter. After the air gap in the magnetic circuit is reduced, the air magnetic resistance is reduced, and the differential mode magnetic flux is increased, thereby further improving the inductance value of the integrated inductor.

In some embodiments, the third magnetic core 3 includes multiple ends, which extend toward the first magnetic core 1 and the second magnetic core 2, and at least one end is distributed on the side of the winding 4; the area between the ends on both sides of any winding 4 on the second magnetic core 2 forms a closed magnetic path with the third magnetic core 3.

There are air gaps between the multiple ends and the first magnetic core 1 and the second magnetic core 2, so that the differential mode equivalent magnetic circuit model of the second magnetic core 2 remains unchanged.

In this embodiment, the extension of the multiple ends can shorten the air path through which the leakage magnetic flux passes, thereby increasing the differential mode inductance value of the integrated inductor.

The extension positions of the multiple ends may be at least one of the following positions:

First, as shown in FIG. 1 and FIG. 6 , the plurality of ends are all located in the inner circle of the second magnetic core 2 , and there are air gaps between the plurality of ends and the inner peripheral wall of the second magnetic core 2 .

In this position, multiple ends are located in the inner circle of the second magnetic core 2, which can shorten the air path through which the leakage fluxes ΦAdm, ΦBdm, and ΦCdm pass, increase the magnetic lines of force of the differential mode in the magnetic core, and thus increase the inductance value without increasing the volume of the integrated inductor, thus meeting the requirements of equipment integration.

Secondly, as shown in Figure 2, the third magnetic core 3 also includes: an extension arm 31; the extension arm 31 is arranged at the end and extends in the direction close to the first magnetic core 1, and the extension arm 31 is distributed on the side of the second magnetic core 2 along the thickness direction of the second magnetic core 2, and the extension arm 31 and the projection of the second magnetic core 2 along the thickness direction of the second magnetic core 2 at least partially overlap.

The projection of the extended arm 31 on the side surface of the second magnetic core 2 partially overlaps with the side surface of the second magnetic core 2 .

In this position, the extension arm 31 extends toward the first magnetic core 1 , which can increase the cross-sectional area of the magnetic circuit to further reduce the air magnetic resistance, thereby further increasing the inductance value.

The extension arm 31 can be disposed on any side surface of the second magnetic core 2 to increase the cross-sectional area of the magnetic circuit; the extension arm 31 can be disposed on both side surfaces of the second magnetic core 2 to further increase the cross-sectional area of the magnetic circuit.

There is an air gap between the extended arm 31 and the second magnetic core 2 , so that the differential-mode equivalent magnetic circuit model of the second magnetic core in FIG. 5 and FIG. 11 remains unchanged.

Third, as shown in Figures 3 and 7, the third magnetic core 3 also includes: an extension arm 31; the extension arm 31 is arranged at the end and extends in the direction close to the outer peripheral wall of the first magnetic core 1, and the extension arm 31 is distributed on the side surfaces of the second magnetic core 2 and the first magnetic core 1 along the thickness direction of the second magnetic core 2, and the extension arm 31 partially overlaps with the projection of the second magnetic core 2 along the thickness direction of the second magnetic core 2, and the extension arm 31 at least partially overlaps with the projection of the first magnetic core 1 along the thickness direction of the second magnetic core 2.

The projections of the extended arms 31 on the side surfaces of the second magnetic core 2 and the first magnetic core 1 partially overlap with the side surfaces of the second magnetic core 2 and the first magnetic core 1 .

It should be noted that the first magnetic core 1 has a small number of magnetic lines of force in the differential mode, a low magnetic flux density, and a low utilization rate. In this embodiment, the extension arm 31 is lengthened so that it covers at least a portion of the first magnetic core 1 to construct a differential mode magnetic line path with a smaller air magnetic resistance, thereby increasing the inductance value of the first magnetic core 1 and improving the utilization rate of the first magnetic core 1.

In this embodiment, the differential mode inductance of the first magnetic core 1 can be controlled by adjusting the overlapping area between the extension arm 31 and the projection of the first magnetic core 1 along the thickness direction of the second magnetic core 2 .

In the process of increasing the differential mode inductance of the first magnetic core 1, the magnetic flux density of the first magnetic core 1 needs to be controlled not to exceed the saturation magnetic flux density of the first magnetic core 1 to ensure the common mode inductance of the first magnetic core 1, while fully utilizing the first magnetic core 1 and improving the overall power density.

Among them, the extended arm 31 can be set on any side of the second magnetic core 2 and the first magnetic core 1 to increase the cross-sectional area of the magnetic circuit; the extended arm 31 can be set on both sides of the second magnetic core 2 and the first magnetic core 1 to further increase the cross-sectional area of the magnetic circuit.

There are air gaps between the extended arm 31 and the second magnetic core 2 and the first magnetic core 1, so that the differential-mode equivalent magnetic circuit model of the second magnetic core in FIG. 5 and FIG. 11 remains unchanged.

In some embodiments, as shown in Figures 8 and 10, along the thickness direction of the first magnetic core 1, the height of the third magnetic core 3 is less than or equal to the height of the winding 4, so that the inductance value of the second magnetic core 2 can be further increased without increasing the volume of the integrated inductor, thereby improving the power density.

In some embodiments, each winding 4 in the plurality of windings 4 has the same number of turns, and each winding 4 in the plurality of windings 4 has the same winding direction.

In some embodiments, the first magnetic core 1 and the second magnetic core 2 are both closed ring-shaped, and the outer circumferential wall of the second magnetic core 2 and the inner circumferential wall of the first magnetic core 1 are spaced at equal distances from each other.

The shapes of the first magnetic core 1 and the second magnetic core 2 can be set according to the use scenario of the integrated inductor, for example, they can be any one of a circular ring, an elliptical ring, a rectangular ring, an oblong or an irregular shape.

The shape of the third magnetic core 3 can be set according to the shapes of the first magnetic core 1 and the second magnetic core 2 to achieve the effect of increasing the inductance value without affecting the overall volume of the integrated inductor.

In some embodiments, as shown in Figures 1-4, the first magnetic core 1 and the second magnetic core 2 are both closed circular rings, and multiple windings 4 are distributed in the circumferential direction of the circular rings; each end of the third magnetic core 3 is located between two adjacent windings 4, and the area on the second magnetic core 2 where any winding 4 is wound forms a closed magnetic path with the corresponding area of the third magnetic core 3, wherein the corresponding area of the third magnetic core 3 is the area between the two ends on both sides of the winding 4.

In this embodiment, the first magnetic core 1 and the second magnetic core 2 are concentric rings.

The third magnetic core 3 may be in at least one of the following structural forms:

First, as shown in Figures 1 and 3, the windings 4 include three; the third magnetic core 3 includes three segments distributed along the circumferential direction, the radial inner ends of the three segments are connected at the same position, and the radial outer ends of the three segments are located between two adjacent windings 4; the area on the second magnetic core 2 where any winding 4 is wound forms a closed magnetic path with the two segments of the three segments located on both sides of the winding 4.

In this embodiment, the third magnetic core 3 is Y-shaped, and the radial inner ends of the three sections of the third magnetic core 3 can be connected at the center of the first magnetic core 1 or at other positions.

As shown in FIG. 1 , the three segments of the third magnetic core 3 are located in the inner circle of the second magnetic core 2 , and the radial outer ends of the three segments of the third magnetic core 3 may be spaced apart from the inner circumferential wall of the second magnetic core 2 .

As shown in FIG. 3 , radial outer ends of the three magnetic core sections of the third magnetic core 3 may be provided with extension arms 31 , and the extension arms 31 may extend to the first magnetic core 1 or the second magnetic core 2 .

Secondly, as shown in Figure 4, the third magnetic core 3 includes multiple arc-shaped magnetic cores 32, and each arc-shaped magnetic core 32 includes two ends; the two ends of the arc-shaped magnetic core 32 are respectively located on both sides of the winding 4, and the area on the second magnetic core 2 where the winding 4 is wound forms a closed magnetic path with the arc-shaped magnetic core 32.

In this embodiment, any two of the plurality of arc-shaped magnetic cores 32 may contact each other or may not contact each other, and this application does not impose any limitation on this. When any two of the plurality of arc-shaped magnetic cores 32 contact each other, the spatial volume of the integrated inductor structure can be relatively reduced.

The shape of the arc-shaped magnetic core 32 may be a circular arc or an elliptical arc. As shown in FIG. 4 , the shape of the arc-shaped magnetic core 32 is a semicircular arc.

By configuring the third magnetic core 3 to be in an arc shape, the difficulty of processing and assembling can be reduced.

In this embodiment, considering the installation space of the integrated inductor, the plurality of arc-shaped magnetic cores 32 may be located in the inner circle of the second magnetic core 2 , or may be located on the sides of the second magnetic core 2 and the first magnetic core 1 .

In some embodiments, multiple arc-shaped magnetic cores 32 can be located on one side of the second magnetic core 2 to increase the cross-sectional area of the magnetic circuit, or multiple arc-shaped magnetic cores 32 can be located on both sides of the second magnetic core 2 to further increase the cross-sectional area of the magnetic circuit, thereby increasing the inductance value.

As shown in FIGS. 6 to 11 , the racetrack-type inductor can also achieve the same technical indicators as the toroidal inductor.

In some embodiments, as shown in Figures 6, 7 and 9, the first magnetic core 1 and the second magnetic core 2 each include a first side and a second side that are oppositely arranged, the first side and the second side are enclosed into a closed shape, and a plurality of windings 4 are wound on one of the first sides; the third magnetic core 3 includes a plurality of bar magnetic cores that are spaced apart, the bar magnetic cores extend toward the two first sides, and are located between two adjacent windings 4; the bar magnetic core and the adjacent second side, and the area on the first side between the second side and the bar magnetic core form a closed magnetic path; the adjacent two bar magnetic cores and the area on the first side between the two bar magnetic cores form a closed magnetic path.

In this embodiment, the first magnetic core 1 and the second magnetic core 2 may be in a racetrack shape or a rectangular shape.

The third magnetic core 3 may be in at least one of the following structural forms:

First, as shown in FIG. 6 and FIG. 7 , at least a portion of the strip-shaped magnetic core is located in the inner circle of the second magnetic core 2 .

In this embodiment, as shown in FIG. 6 , the strip core is located in the inner circle of the second magnetic core 2 , and both ends of the strip core extend toward the inner peripheral wall of the second magnetic core 2 and are spaced apart from the inner peripheral wall of the second magnetic core 2 .

In this embodiment, as shown in FIG. 7 , an extension arm 31 is provided at the end of the strip-shaped magnetic core. The extension arm 31 may extend to the first magnetic core 1 or the second magnetic core 2 .

Secondly, as shown in Figures 9 and 10, the strip magnetic cores are distributed on the side of the second magnetic core 2 along the thickness direction of the second magnetic core 2, the projections of the strip magnetic cores and the second magnetic core 2 along the thickness direction of the second magnetic core 2 partially overlap, and the projections of the strip magnetic cores and the first magnetic core 1 along the thickness direction of the second magnetic core 2 at least partially overlap.

Among them, considering the installation space of the integrated inductor, multiple bar cores can be located on one side of the second magnetic core 2 to increase the cross-sectional area of the magnetic circuit, or multiple bar cores can be located on both sides of the second magnetic core 2 to further increase the cross-sectional area of the magnetic circuit, thereby increasing the inductance value.

In the related technology, the common mode fluxes ΦAcm, ΦBcm, and ΦCcm of the three-phase annular common mode inductor will cancel each other out in the magnetic core due to the phase difference of 120°; the leakage flux, that is, the size of the differential mode flux ΦAdm, ΦBdm, and ΦCdm determines the size of the differential mode component of the common mode inductor, and also determines the saturation degree of the magnetic core. When the common mode inductance is determined, its current excitation and number of turns are often determined accordingly.

The calculation formula for differential common mode integrated inductor is:

L＝NΦ/I

Among them, L is the differential common-mode integrated inductor, N is the number of turns, Φ is the magnetic flux contained in the winding, and I is the current excitation.

It should be noted that the leakage magnetic path of the three-phase toroidal inductor in FIG12 includes the path of the magnetic flux on the two-dimensional plane, and also includes the leakage magnetic flux in all directions around the winding, and the differential mode inductance is determined by these leakage magnetic fluxes.

As shown in Figure 13, R0 represents the air reluctance, Rdm represents the core reluctance, and FAdm represents the magnetomotive force generated by the A-phase winding. The differential mode flux ΦAdm is obtained by dividing the magnetomotive force by the reluctance. The magnetomotive force is determined by the number of turns N and the current excitation I, and is a constant when designing the differential mode inductance.

The formula for calculating the magnetic resistance between air and the magnetic core is:

R＝le/(μ0*Ae)

Among them, R is the magnetic resistance, le is the magnetic path length, μ0 is the relative magnetic permeability, and Ae is the magnetic path cross-sectional area.

Since the relative magnetic permeability of air is 1, while the magnetic permeability of the magnetic core is generally in the thousands to tens of thousands, the difference in the magnetic path length and cross-sectional area between the two can be ignored. Therefore, R0>>Rdm, that is, the differential mode flux is mainly determined by the magnetic resistance of the air. As shown in Figure 13, in the annular core, the leakage flux has a longer path through the air, and the air magnetic resistance is larger, resulting in a smaller differential mode flux and a smaller differential mode component of the annular common mode inductor.

The internal magnetic flux of the integrated common-mode inductor after integration of the integrated inductor provided in the embodiment of the present application is shown in Figures 5 and 11. A third magnetic core 3 is added to the inner circle of the second magnetic core 2 to shorten the air path through which the leakage magnetic fluxes ΦAdm, ΦBdm, and ΦCdm pass. It can be seen from the calculation formula of the differential common-mode integrated inductor that after the air gap le in the magnetic circuit is reduced, the air magnetic resistance R0 is reduced, and the differential-mode magnetic flux ΦAdm is increased, so that the differential-mode component Lidm of the common-mode inductor is increased.

The calculation formula for magnetic flux density is:

B＝Φ/S

Among them, B is the magnetic flux density, S is the cross-sectional area of the core, and Φ is the magnetic flux contained in the winding.

However, as the differential mode component increases, it can be seen from the calculation formula of the magnetic flux density that due to the increase in the differential mode magnetic flux, the magnetic flux density of the second magnetic core 2 will increase when the cross-sectional area of the magnetic core remains unchanged, which may cause the second magnetic core 2 to be partially saturated. The saturation of the magnetic core will cause the magnetic permeability of the magnetic core to decrease, but because the magnetic permeability of the magnetic core is much greater than the magnetic permeability of the air, after the magnetic core is saturated to a certain extent, there is still R0>>Rdm, so the degree of reduction of the differential mode component of the inductance is very small and can be ignored; and the common mode inductance Licm provided by the second magnetic core 2 will be greatly reduced. In this case, the second magnetic core 2 mainly provides the differential mode component, and the common mode component is relatively small.

In the first magnetic core 1, the common mode magnetic fluxes ΦAcm, ΦBcm, and ΦCcm will still cancel each other out, while the differential mode magnetic flux is still small due to the air gap between the first magnetic core 1 and the second magnetic core 2, so the differential mode inductance Lodm provided by the first magnetic core 1 is small. Therefore, the first magnetic core 1 mainly provides the common mode inductance Locm of the first magnetic core 1. At the same time, since the differential mode magnetic flux in the first magnetic core 1 is small, the first magnetic core 1 is not easy to saturate, and the common mode inductance is guaranteed.

Through analysis, the total mode inductance and differential mode inductance of this application can be expressed by the following formula:

Wherein, Lcm is the total common mode inductance, Locm is the common mode inductance of the first magnetic core 1 , Licm is the common mode inductance of the second magnetic core 2 , Ldm is the total differential mode inductance, Lodm is the differential mode inductance of the first magnetic core 1 , and Lidm is the differential mode inductance of the second magnetic core 2 .

When the second magnetic core 2 is fully utilized, that is, the second magnetic core 2 is highly saturated, Locm>>Licm, and Lidm>>Lodm. That is, the common mode inductance is mainly provided by the first magnetic core 1, and the differential mode inductance is mainly provided by the second magnetic core 2.

When the projections of the third magnetic core 3 and the first magnetic core 1 along the thickness direction of the second magnetic core 2 at least partially overlap, the magnetic path cross-sectional area used in calculating the air gap magnetic resistance is the partial area of the overlap between the third magnetic core 3 and the first magnetic core 1 .

In a second aspect, the present application also provides a circuit component, comprising any one of the above-mentioned integrated inductors.

The circuit assembly includes a circuit board and an integrated inductor, and the integrated inductor is connected to the circuit board.

The circuit board includes an inductor mounting area, a soldering pad is provided in the inductor mounting area, and the integrated inductor is soldered to the soldering pad via wiring pins.

According to the circuit assembly provided in the embodiment of the present application, on the one hand, by providing a first magnetic core 1 and a second magnetic core 2, and the first magnetic core 1 is wrapped around the outer ring of the second magnetic core 2, the differential and common mode magnetic circuits can be separated to a certain extent. The first magnetic core 1 mainly provides a common mode component, and the second magnetic core 2 mainly provides a differential mode component. Compared with the related art in which the same magnetic core provides both a common mode component and a differential mode component, the cross-sectional area of the magnetic core is increased, thereby increasing the paths of the differential mode magnetic lines of force and the common mode magnetic lines of force, making the first magnetic core 1 and the second magnetic core 2 less likely to saturate, thereby improving the common mode inductance of the first magnetic core 1 and the differential mode inductance of the second magnetic core 2; on the other hand, by providing a third magnetic core 3, a closed magnetic path is formed between the third magnetic core 3 and the area on the second magnetic core 2 where the winding 4 is wound, so that the air path through which the leakage magnetic flux passes becomes shorter. After the air gap in the magnetic circuit is reduced, the air magnetic resistance is reduced, and the differential mode magnetic flux is increased, thereby further improving the inductance value of the integrated inductor.

In a third aspect, the present application also provides an inverter, comprising any one of the above-mentioned integrated inductors.

The inverter includes a shell and a circuit board assembly, the circuit board assembly is connected to the integrated inductor, and the shell surrounds the circuit board assembly.

According to the inverter provided by the embodiment of the present application, on the one hand, by providing the first magnetic core 1 and the second magnetic core 2, and the first magnetic core 1 is surrounded by the outer ring of the second magnetic core 2, the differential and common mode magnetic circuits can be separated to a certain extent. The first magnetic core 1 mainly provides the common mode component, and the second magnetic core 2 mainly provides the differential mode component. Compared with the related art in which the same magnetic core provides both the common mode component and the differential mode component, the cross-sectional area of the magnetic core is increased, thereby increasing the paths of the differential mode magnetic lines of force and the common mode magnetic lines of force, making the first magnetic core 1 and the second magnetic core 2 less likely to saturate, thereby improving the common mode inductance of the first magnetic core 1 and the differential mode inductance of the second magnetic core 2; on the other hand, by providing the third magnetic core 3, a closed magnetic path is formed between the third magnetic core 3 and the area on the second magnetic core 2 where the winding 4 is wound, so that the air path through which the leakage magnetic flux passes becomes shorter. After the air gap in the magnetic circuit is reduced, the air magnetic resistance is reduced, and the differential mode magnetic flux is increased, thereby further improving the inductance value of the integrated inductor.

The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and/or" in the specification and claims represents at least one of the connected objects, and the character "/" generally indicates that the objects associated with each other are in an "or" relationship.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

In the description of this application, "first feature" or "second feature" may include one or more of the features.

In the description of the present application, “plurality” means two or more.

In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims (16)

1. An integrated inductor, comprising:

a first magnetic core;

A second magnetic core, the first magnetic core surrounds the second magnetic core outer ring, and the second magnetic core is spaced from the first magnetic core;

The coils are wound on the first magnetic core and the second magnetic core, any two of the coils are spaced, and a common-mode inductance is formed between the coils and the first magnetic core;

And a third magnetic core, wherein a winding is not wound on the third magnetic core, a closed magnetic path is formed between the area, on which the winding is wound, of the second magnetic core and the third magnetic core, and a differential mode inductance is respectively formed between each winding and the closed magnetic path.

2. The integrated inductor of claim 1, wherein the integrated inductor comprises,

The third magnetic core comprises a plurality of end parts, the plurality of end parts extend towards the first magnetic core and the second magnetic core, and at least one end part is distributed on the side surface of the winding;

The region of the second magnetic core between the ends of either side of the winding forms a closed magnetic path with the third magnetic core.

3. The integrated inductor of claim 2, wherein the integrated inductor comprises,

The plurality of end portions are all located in the inner ring of the second magnetic core, and an air gap exists between the plurality of end portions and the inner peripheral wall of the second magnetic core.

4. The integrated inductor of claim 3, wherein the third magnetic core further comprises: an extension arm;

The extension arm is arranged at the end part, extends towards the direction close to the first magnetic core, is distributed on the side surface of the second magnetic core along the thickness direction of the second magnetic core, and is at least partially overlapped with the projection of the second magnetic core along the thickness direction of the second magnetic core.

5. The integrated inductor of claim 3, wherein the third magnetic core further comprises: an extension arm;

the extension arm set up in the tip, and towards being close to the direction of the peripheral wall of first magnetic core extends, follows the thickness direction of second magnetic core the extension arm distribute in the second magnetic core with the side of first magnetic core, the extension arm with the second magnetic core is followed the projection part coincidence of second magnetic core thickness direction, just the extension arm with the first magnetic core is followed the projection of second magnetic core thickness direction is at least partly coincident.

6. The integrated inductor of claim 1, wherein the integrated inductor comprises,

The number of coil turns of each of the plurality of windings is the same, and the winding direction of each of the plurality of windings is the same.

7. The integrated inductor of claim 1, wherein the integrated inductor comprises,

The first magnetic core and the second magnetic core are closed annular, and the interval distance between the outer peripheral wall of the second magnetic core and each part of the inner peripheral wall of the first magnetic core is equal.

8. The integrated inductor of claim 1, wherein the integrated inductor comprises,

And the height of the third magnetic core is smaller than or equal to the height of the winding along the thickness direction of the first magnetic core.

9. An integrated inductor as claimed in any one of claims 2-5, characterized in that,

The first magnetic core and the second magnetic core are closed circular rings, and the windings are distributed at intervals along the circumferential direction of the circular rings;

Each end part of the third magnetic core is positioned between two adjacent windings, and a closed magnetic path is formed between the area, around which any winding is wound, of the second magnetic core and the corresponding area of the third magnetic core, wherein the corresponding area of the third magnetic core is the area between the two end parts on two sides of the winding.

10. The integrated inductor of claim 9, wherein the integrated inductor comprises,

The winding comprises three;

The third magnetic core comprises three sections distributed along the circumferential direction, the radial inner ends of the three sections are connected to the same position, and the radial outer ends of the three sections are positioned between two adjacent windings;

And a closed magnetic path is formed between the region, around which any one of the windings is wound, of the second magnetic core and two sections of the three sections, which are positioned on two sides of the winding.

11. The integrated inductor of claim 9, wherein the integrated inductor comprises,

The third magnetic core comprises a plurality of arc-shaped magnetic cores, and each arc-shaped magnetic core comprises two end parts;

The two ends of the arc-shaped magnetic core are respectively positioned at two sides of the winding, and the area, on which the winding is wound, of the second magnetic core and the arc-shaped magnetic core form a closed magnetic path.

12. The integrated inductor according to any one of claims 1-8, wherein,

The first magnetic core and the second magnetic core comprise a first edge and a second edge which are oppositely arranged, the first edge and the second edge are surrounded into a closed shape, and the plurality of windings are wound on one of the first edges;

The third magnetic core comprises a plurality of strip-shaped magnetic cores which are arranged at intervals, extend towards two first sides and are positioned between two adjacent windings;

The strip-shaped magnetic core and the adjacent second side, and the area between the second side and the strip-shaped magnetic core on the first side form a closed magnetic path; two adjacent strip-shaped magnetic cores and the area between the two strip-shaped magnetic cores on the first side form a closed magnetic path.

13. The integrated inductor of claim 12, wherein at least a portion of the strip core is located in an inner race of the second core.

14. The integrated inductor of claim 12, wherein the integrated inductor comprises,

The strip-shaped magnetic cores are distributed on the side face of the second magnetic core along the thickness direction of the second magnetic core, the strip-shaped magnetic cores are overlapped with the projection part of the second magnetic core along the thickness direction of the second magnetic core, and the projection of the strip-shaped magnetic cores and the first magnetic core along the thickness direction of the second magnetic core is at least partially overlapped.

15. A circuit assembly comprising the integrated inductor of any one of claims 1-14.

16. An inverter comprising the integrated inductor of any one of claims 1-14.