Three-phase differential mode magnetic integrated inductor

Abstract

The present invention provides a three-phase differential mode magnetic integrated inductor, which relates to the technical field of inductors. The structure includes three edge differential mode magnetic columns, a central common mode magnetic column, a first magnetic yoke and a second magnetic yoke. The three edge differential mode magnetic columns and the central common mode magnetic column are all arranged between the first magnetic yoke and the second magnetic yoke and are parallel to each other. The magnetic permeabilities of the central common mode magnetic column, the first magnetic yoke and the second magnetic yoke are all greater than the magnetic permeabilities of the edge differential mode magnetic columns. Each edge differential mode magnetic column is wound with a differential mode winding and a three-phase magnetic flux balance winding corresponding to the differential mode winding. The three-phase magnetic flux balance winding is wound in the opposite direction to the corresponding differential mode winding. The magnetic permeabilities of the differential mode windings wound on the three edge differential mode magnetic columns are the same, and the number of turns of the differential mode winding is two or three times the number of turns of the sub-magnetic flux balance winding in the corresponding three-phase magnetic flux balance winding. The present invention can reduce the loss of the inductor under asymmetric load conditions and improve the performance of the inductor.

Description

Technical Field

[0001] The present invention relates to the technical field of inductors, and in particular to a three-phase differential-mode magnetic integrated inductor. Background Art

[0002] With the development of power electronics technology, three-phase differential mode inductors are important components in inverters, power converters and other equipment. Their design and optimization are crucial to improving the overall system efficiency. Traditional three-phase differential mode inductors usually adopt a separate design, but due to space limitations and the need to increase power density, integrated design has gradually become the mainstream trend. Integrated three-phase differential mode inductors can not only save installation space, but also reduce external interference and improve the electromagnetic compatibility of the system.

[0003] However, in the existing three-phase differential-mode inductor magnetic integration solution, although it can achieve good performance under symmetrical load conditions, when facing asymmetrical loads, the magnetic flux on the common-mode magnetic column cannot reach the zero state, resulting in additional losses on the yoke and the common magnetic column, which in turn affects the overall performance and reliability of the inductor. Summary of the invention

[0004] The problem solved by the present invention is how to reduce the loss of the inductor under asymmetric load conditions and improve the performance of the inductor.

[0005] To solve the above problems, the present invention provides a three-phase differential-mode magnetic integrated inductor, comprising three edge differential-mode magnetic columns, a central common-mode magnetic column, a first magnetic yoke and a second magnetic yoke, wherein the three edge differential-mode magnetic columns and the central common-mode magnetic column are arranged between the first magnetic yoke and the second magnetic yoke and are parallel to each other, and the magnetic permeabilities of the central common-mode magnetic column, the first magnetic yoke and the second magnetic yoke are all greater than the magnetic permeabilities of the edge differential-mode magnetic columns;

[0006] Among them, each of the edge differential mode magnetic columns is wound with a differential mode winding and a three-phase flux balance winding corresponding to the differential mode winding, the three-phase flux balance winding is wound in opposite directions to the corresponding differential mode winding, the differential mode windings wound on the three edge differential mode magnetic columns have the same magnetic permeability, the three-phase flux balance winding includes at least two of the A-phase sub-flux balance winding, the B-phase sub-flux balance winding and the C-phase sub-flux balance winding, the number of turns of the A-phase sub-flux balance winding, the B-phase sub-flux balance winding and the C-phase sub-flux balance winding are all the same, and the number of turns of the differential mode winding is two or three times that of the A-phase sub-flux balance winding, the B-phase sub-flux balance winding, or the C-phase sub-flux balance winding.

[0007] Optionally, the edge differential mode magnetic column is made of alloy magnetic powder, and the first magnetic yoke, the second magnetic yoke and the center common mode magnetic column are all made of one of amorphous material, nanocrystalline material and silicon steel.

[0008] Optionally, the differential mode windings on the three edge differential mode magnetic columns have the same winding direction and the same number of turns.

[0009] Optionally, one phase current flows through each of the differential mode windings on the three edge differential mode magnetic columns, and a phase difference between each phase current flowing through the differential mode windings on the three edge differential mode magnetic columns is 120°.

[0010] Optionally, the winding direction of each differential mode winding is the same as the flow direction of the corresponding single-phase current.

[0011] Optionally, the three edge differential mode magnetic columns are respectively an A-phase edge differential mode magnetic column, a B-phase edge differential mode magnetic column and a C-phase edge differential mode magnetic column, the differential mode winding wound on the A-phase edge differential mode magnetic column is an A-phase differential mode winding, the differential mode winding wound on the B-phase edge differential mode magnetic column is a B-phase differential mode winding, and the differential mode winding wound on the C-phase edge differential mode magnetic column is a C-phase differential mode winding, and the A-phase current in the three-phase current flows through the A-phase differential mode winding so that the A-phase edge differential mode magnetic column, the center The common mode magnetic column, the first magnetic yoke and the second magnetic yoke constitute an A-phase closed magnetic circuit, the B-phase current of the three-phase current flows through the B-phase differential mode winding so that the B-phase edge differential mode magnetic column, the center common mode magnetic column, the first magnetic yoke and the second magnetic yoke constitute a B-phase closed magnetic circuit, and the C-phase current of the three-phase current flows through the C-phase differential mode winding so that the C-phase edge differential mode magnetic column, the center common mode magnetic column, the first magnetic yoke and the second magnetic yoke constitute a C-phase closed magnetic circuit;

[0012] Among them, the equivalent magnetic circuit lengths and equivalent cross-sectional areas of the A-phase closed magnetic circuit, the B-phase closed magnetic circuit and the C-phase closed magnetic circuit are all the same.

[0013] Optionally, the three-phase flux balance winding includes an A-phase sub-flux balance winding, a B-phase sub-flux balance winding and a C-phase sub-flux balance winding, and the number of turns of the differential mode winding is three times the number of turns of the A-phase sub-flux balance winding, or the B-phase sub-flux balance winding, or the C-phase sub-flux balance winding;

[0014] The A-phase sub-flux balance winding, the B-phase sub-flux balance winding and the C-phase sub-flux balance winding are layered and concentrically wound on the corresponding edge differential mode magnetic columns.

[0015] Optionally, the three-phase flux balance winding includes two of the A-phase sub-flux balance winding, the B-phase sub-flux balance winding and the C-phase sub-flux balance winding, and the number of turns of the differential mode winding is twice the number of turns of the A-phase sub-flux balance winding, the B-phase sub-flux balance winding, or the C-phase sub-flux balance winding.

[0016] Optionally, the three-phase flux balance winding wound on the A-phase edge differential mode magnetic column is a first flux balance winding, which includes a B-phase sub-flux balance winding and a C-phase sub-flux balance winding; the three-phase flux balance winding wound on the B-phase edge differential mode magnetic column is a second flux balance winding, which includes an A-phase sub-flux balance winding and a C-phase sub-flux balance winding; the three-phase flux balance winding wound on the C-phase edge differential mode magnetic column is a third flux balance winding, which includes an A-phase sub-flux balance winding and a B-phase flux sub-balance winding.

[0017] Optionally, the B-phase sub-flux balance winding and the C-phase sub-flux balance winding on the A-phase edge differential mode magnetic column are layered and concentrically wound on the A-phase edge differential mode magnetic column, the A-phase sub-flux balance winding and the C-phase sub-flux balance winding on the B-phase edge differential mode magnetic column are layered and concentrically wound on the B-phase edge differential mode magnetic column, and the A-phase sub-flux balance winding and the B-phase sub-flux balance winding on the C-phase edge differential mode magnetic column are layered and concentrically wound on the C-phase edge differential mode magnetic column.

[0018] Compared with the prior art, the three-phase differential-mode magnetic integrated inductor of the present invention has the following beneficial effects: the edge differential-mode magnetic column, the center common-mode magnetic column, the first magnetic yoke and the second magnetic yoke constitute the structure of the inductor to realize the magnetic integration of the edge differential-mode magnetic column; by arranging the three edge differential-mode magnetic columns and the center common-mode magnetic column between the first magnetic yoke and the second magnetic yoke and arranging them parallel to each other to form a stable magnetic flux loop between the edge differential-mode magnetic column and the center common-mode magnetic column, the magnetic flux loss of the inductor is reduced; and the magnetic permeability of the center common-mode magnetic column, the first magnetic yoke and the second magnetic yoke are all greater than the magnetic permeability of the edge differential-mode magnetic column, so that the magnetic flux of each edge differential-mode magnetic column is mainly concentrated in the magnetic field composed of the respective edge differential-mode magnetic column, the center common-mode magnetic column, the first magnetic yoke and the second magnetic yoke. On the magnetic flux loop, the coupling between the edge differential mode magnetic columns is reduced; by arranging the three-phase magnetic flux balancing winding corresponding to the differential mode winding on the edge differential mode magnetic column, the winding direction of the three-phase magnetic flux balancing winding is opposite to that of the corresponding differential mode winding, the magnetic permeability of the differential mode windings wound on the three edge differential mode magnetic columns is the same, and the number of turns of the differential mode winding is two or three times the number of turns of the sub-magnetic flux balancing winding in the corresponding three-phase magnetic flux balancing winding, so that the unbalanced magnetic field generated by the differential mode winding under the condition of asymmetric load can be compensated by the magnetic field generated by the three-phase magnetic flux balancing winding, so as to achieve magnetic flux balance on the common mode magnetic column, reduce the energy loss caused by the unbalanced magnetic field, and then reduce the loss of the inductor and improve the performance of the inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a three-phase differential-mode magnetic integrated inductor according to an embodiment of the present invention;

[0020] Figure 2 It is a structural schematic diagram of a three-phase differential-mode magnetic integrated inductor according to another embodiment of the present invention;

[0021] Figure 3 The figure is a schematic structural diagram of a three-phase differential-mode magnetic integrated inductor according to another embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 1-edge differential mode magnetic column; 11-A phase edge differential mode magnetic column; 12-B phase edge differential mode magnetic column; 13-C phase edge differential mode magnetic column; 2-center common mode magnetic column; 3-first yoke; 4-second yoke; 5-differential mode winding; 51-A phase differential mode winding; 52-B phase differential mode winding; 53-C phase differential mode winding; 6-three-phase flux balance winding; 61-A phase sub-flux balance winding; 62-B phase sub-flux balance winding; 63-C phase sub-flux balance winding. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] A three-phase differential-mode magnetic integrated inductor provided in an embodiment of the present invention is described below.

[0027] Reference Figure 1 and Figure 2 An embodiment of the present invention provides a three-phase differential-mode magnetic integrated inductor, comprising three edge differential-mode magnetic columns 1, a central common-mode magnetic column 2, a first magnetic yoke 3 and a second magnetic yoke 4. The three edge differential-mode magnetic columns 1 and the central common-mode magnetic column 2 are all arranged between the first magnetic yoke 3 and the second magnetic yoke 4 and are parallel to each other. The magnetic permeabilities of the central common-mode magnetic column 2, the first magnetic yoke 3 and the second magnetic yoke 4 are all greater than the magnetic permeability of the edge differential-mode magnetic column 1.

[0028] It needs to be explained that the three edge differential-mode magnetic columns 1 are respectively arranged on the periphery of the central common-mode magnetic column 2 as the center to realize the flux aggregation of the three-phase differential-mode magnetic integrated inductor, and the first yoke 3 and the second yoke 4 are used to form a complete magnetic circuit with the edge differential-mode magnetic column 1 and the central common-mode magnetic column 2. The magnetic permeabilities of the central common-mode magnetic column 2, the first yoke 3 and the second yoke 4 are all greater than the magnetic permeability of the edge differential-mode magnetic column 1, which can ensure that the differential-mode winding 5 on the edge differential-mode magnetic column 1 is decoupled.

[0029] Among them, each of the edge differential mode magnetic columns 1 is wound with a differential mode winding 5 and a three-phase flux balance winding 6 corresponding to the differential mode winding 5, the three-phase flux balance winding 6 is wound in the opposite direction to the corresponding differential mode winding 5, the differential mode windings 5 ​​wound on the three edge differential mode magnetic columns 1 have the same magnetic permeability, the three-phase flux balance winding 6 includes at least two of the A-phase sub-flux balance winding 61, the B-phase sub-flux balance winding 62 and the C-phase sub-flux balance winding 63, the number of turns of the A-phase sub-flux balance winding 61, the B-phase sub-flux balance winding 62 and the C-phase sub-flux balance winding 63 are the same, and the number of turns of the differential mode winding 5 is two or three times the number of turns of the A-phase sub-flux balance winding 61, the B-phase sub-flux balance winding 62, or the C-phase sub-flux balance winding 63.

[0030] Specifically, a differential-mode winding 5 is wound on each edge differential-mode magnetic column 1. When current passes through the differential-mode winding 5, a corresponding magnetic field is generated in the edge differential-mode magnetic column 1. The differential-mode signal in the three-phase differential-mode magnetic integrated inductor can be effectively regulated by the change of the magnetic field. Furthermore, the differential-mode winding 5 can generate a magnetic field opposite to the common-mode interference, thereby offsetting the noise and interference caused by the common-mode interference, thereby improving the anti-interference capability of the three-phase differential-mode magnetic integrated inductor. In addition, a three-phase flux balancing winding 6 corresponding to the differential-mode winding 5 is wound on the edge differential-mode magnetic column 1. Since the three-phase flux balancing winding 6 is wound in opposite directions to the corresponding differential-mode winding 5, the three-phase flux balancing winding 6 generates a magnetic field opposite to the common-mode signal. Therefore, when the load of the three-phase differential-mode magnetic integrated inductor is unbalanced, the magnetic field generated by the three-phase flux balancing winding 6 is used to compensate for the magnetic field generated by the differential-mode winding 5, so as to avoid performance degradation of the three-phase differential-mode magnetic integrated inductor caused by uneven magnetic flux.

[0031] It needs to be explained that the magnetic permeabilities of the central common-mode magnetic column 2, the first magnetic yoke 3 and the second magnetic yoke 4 are all greater than the magnetic permeability of the edge differential-mode magnetic column 1, which can simultaneously ensure that the three-phase flux balance winding 6 on the edge differential-mode magnetic column 1 is decoupled. Therefore, the differential-mode winding 5 on each edge differential-mode magnetic column 1 and the closed magnetic circuit formed by the three-phase flux balance winding 6 corresponding to the differential-mode winding 5 can be set to be the same in terms of equivalent magnetic circuit length and equivalent cross-sectional area.

[0032] Furthermore, the three-phase flux balance windings 6 on the three edge differential mode magnetic columns 1 are wound in opposite directions to the corresponding differential mode windings 5. According to Ampere's loop law, the magnetic fluxes on the three edge differential mode magnetic columns 1 can be calculated respectively, and the calculation formula is as follows:

[0033] ;

[0034] ;

[0035] ;

[0036] ;

[0037] in, represents the magnetic flux of the A-phase edge differential mode magnetic column 11, represents the magnetic flux of the B-phase edge differential mode magnetic column 12, represents the magnetic flux of the C-phase edge differential mode magnetic column 13, represents the magnetic permeability of the A-phase edge differential mode magnetic column 11, represents the magnetic permeability of the B-phase edge differential mode magnetic column 12, represents the magnetic permeability of the C-phase edge differential mode magnetic column 13; represents the number of turns of each differential mode winding 5, represents the number of turns of the single-phase flux balance winding in the three-phase flux balance winding 6 on each edge differential mode magnetic column 1, Indicates the A-phase winding current, represents the B phase winding current, represents the C phase winding current, represents the magnetic flux flowing through the first magnetic yoke 3, the second magnetic yoke 4 and the central common mode magnetic column 2, represents the equivalent cross-sectional area, represents the equivalent magnetic circuit length, represents the magnetic permeability of the three-phase flux balance winding 6.

[0038] It can be obtained from the above formula that when the magnetic permeabilities between the edge differential mode magnetic columns 1 are the same, if the number of turns of the differential mode winding 5 is three times the number of turns of the corresponding A-phase sub-magnetic flux balance winding 61, the B-phase sub-magnetic flux balance winding 62, or the C-phase sub-magnetic flux balance winding 63 in the three-phase magnetic flux balance winding 6, even if the A-phase winding current, the B-phase winding current and the C-phase winding current are different, the magnetic flux flowing through the first magnetic yoke 3, the second magnetic yoke 4 and the central common mode magnetic column 2 is 0.

[0039] In addition, since one phase of the three-phase flux balance winding 6 on each edge differential mode magnetic column 1 has the same current as the corresponding differential mode winding 5, but the winding direction is opposite, the two can be offset at this time. That is, the number of turns of the differential mode winding 5 is twice that of the A-phase sub-magnetic flux balance winding 61, the B-phase sub-magnetic flux balance winding 62, or the C-phase sub-magnetic flux balance winding 63 in the corresponding three-phase flux balance winding 6, and the A-phase winding current, the B-phase winding current and the C-phase winding current are different, and the magnetic flux flowing through the first magnetic yoke 3, the second magnetic yoke 4 and the central common mode magnetic column 2 is also 0.

[0040] Compared with the prior art, the beneficial effects of the three-phase differential-mode magnetic integrated inductor of the present invention are as follows: the edge differential-mode magnetic column 1, the central common-mode magnetic column 2, the first magnetic yoke 3 and the second magnetic yoke 4 constitute the structure of the inductor to realize the magnetic integration of the edge differential-mode magnetic column 1; by arranging the three edge differential-mode magnetic columns 1 and the central common-mode magnetic column 2 between the first magnetic yoke 3 and the second magnetic yoke 4 and arranging them in parallel to each other to form a stable magnetic flux loop between the edge differential-mode magnetic column 1 and the central common-mode magnetic column 2, a current channel of a stable inductor can be obtained, and the magnetic flux loss of the inductor can be reduced; and the magnetic permeabilities of the central common-mode magnetic column 2, the first magnetic yoke 3 and the second magnetic yoke 4 are all greater than the magnetic permeabilities of the edge differential-mode magnetic column 1, so that the magnetic flux of each edge differential-mode magnetic column 1 is mainly concentrated in the region formed by the respective edge differential-mode magnetic column 1, the central common-mode magnetic column 2, the first magnetic yoke 3 and the second magnetic yoke 4. and the second magnetic yoke 4, thereby reducing the coupling between the edge differential mode magnetic columns 1; by arranging a three-phase magnetic flux balancing winding 6 corresponding to the differential mode winding 5 on the edge differential mode magnetic column 1, the three-phase magnetic flux balancing winding 6 is wound in opposite directions to the corresponding differential mode winding 5, the differential mode windings 5 ​​wound on the three edge differential mode magnetic columns 1 have the same magnetic permeability, and the number of turns of the differential mode winding 5 is twice or three times the number of turns of the sub-magnetic flux balancing winding in the corresponding three-phase magnetic flux balancing winding 6, so that the unbalanced magnetic field generated by the differential mode winding 5 under the condition of asymmetric load can be compensated by the magnetic field generated by the three-phase magnetic flux balancing winding 6, thereby achieving magnetic flux balance on the central common mode magnetic column 2, reducing the energy loss caused by the unbalanced magnetic field, thereby reducing the loss of the inductor and improving the performance of the inductor.

[0041] In one embodiment, the edge differential mode magnetic column 1 is made of alloy magnetic powder, and the first magnetic yoke 3, the second magnetic yoke 4 and the central common mode magnetic column 2 are all made of one of amorphous material, nanocrystalline material and silicon steel.

[0042] This embodiment further restricts the preparation materials of the edge differential-mode magnetic column 1, the first magnetic yoke 3, the second magnetic yoke 4, and the central common-mode magnetic column 2, so that the differential-mode current and the common-mode current can be efficiently processed in a complex environment, thereby improving the efficiency and stability of the operation of the three-phase differential-mode magnetic integrated inductor.

[0043] In one embodiment, the differential mode windings 5 ​​on the three edge differential mode magnetic columns 1 have the same winding direction and the same number of turns.

[0044] The same winding direction and number of turns of the differential mode windings 5 ​​on the three edge differential mode magnetic columns 1 can ensure that magnetic fluxes of the same direction and intensity are generated in the edge differential mode magnetic columns 1 when current passes through, thereby reducing energy losses caused by uneven current and improving the energy efficiency of the three-phase differential mode magnetic integrated inductor.

[0045] In one embodiment, one phase current flows through each of the differential mode windings 5 ​​on the three edge differential mode magnetic columns 1 , and the phase difference between each phase current flowing through the differential mode windings 5 ​​on the three edge differential mode magnetic columns 1 is 120°.

[0046] By setting the differential mode windings 5 ​​on the three edge differential mode magnetic columns 1 to flow through one phase current respectively, and the phase difference between each phase current flowing through the differential mode windings 5 ​​on the three edge differential mode magnetic columns 1 is 120°, it can be ensured that the magnetic fields generated by each differential mode winding 5 cancel each other out in the edge differential mode magnetic column 1, and then form differential mode flux in the central common mode magnetic column 2, thereby enhancing the stability of the three-phase differential mode magnetic integrated inductor.

[0047] In one embodiment, the winding direction of each differential mode winding 5 is the same as the flow direction of the corresponding one-phase current.

[0048] It needs to be explained that each phase current in the three-phase AC power supply flows through the three differential-mode windings 5 ​​of the three-phase differential-mode magnetic integrated inductor respectively, and the winding direction of each differential-mode winding 5 is the same as the flow direction of the corresponding one-phase current, which can ensure the effective coupling of the magnetic field and enhance the anti-interference ability of the three-phase differential-mode magnetic integrated inductor.

[0049] In one embodiment, the three edge differential mode magnetic columns 1 are respectively an A-phase edge differential mode magnetic column 11, a B-phase edge differential mode magnetic column 12 and a C-phase edge differential mode magnetic column 13. The differential mode winding 5 wound on the A-phase edge differential mode magnetic column 11 is an A-phase differential mode winding 51, the differential mode winding 5 wound on the B-phase edge differential mode magnetic column 12 is a B-phase differential mode winding 52, and the differential mode winding 5 wound on the C-phase edge differential mode magnetic column 13 is a C-phase differential mode winding 53. The A-phase current in the three-phase current flows through the A-phase differential mode winding 51 so that the A-phase edge differential mode magnetic column 11. The central common mode magnetic column 2, the first magnetic yoke 3 and the second magnetic yoke 4 constitute an A-phase closed magnetic circuit, the B-phase current in the three-phase current flows through the B-phase differential mode winding 52 so that the B-phase edge differential mode magnetic column 12, the central common mode magnetic column 2, the first magnetic yoke 3 and the second magnetic yoke 4 constitute a B-phase closed magnetic circuit, and the C-phase current in the three-phase current flows through the C-phase differential mode winding 53 so that the C-phase edge differential mode magnetic column 13, the central common mode magnetic column 2, the first magnetic yoke 3 and the second magnetic yoke 4 constitute a C-phase closed magnetic circuit;

[0050] Among them, the equivalent magnetic circuit lengths and equivalent cross-sectional areas of the A-phase closed magnetic circuit, the B-phase closed magnetic circuit and the C-phase closed magnetic circuit are all the same.

[0051] It should be explained that the equivalent magnetic circuit length refers to the sum of the "path lengths" experienced by the various parts (such as magnetic columns, windings, etc.) that form a closed magnetic circuit in the magnetic field. When the equivalent magnetic circuit lengths of the three closed magnetic circuits (phase A, phase B, and phase C) are the same, it indicates that the magnetic flux of each phase passes through the same distance, and the magnetic flux distribution of each closed magnetic circuit is symmetrical, which can provide a basis for the magnetic flux flowing through the first magnetic yoke 3, the second magnetic yoke 4 and the central common mode magnetic column 2 to be zero when the A phase winding current, the B phase winding current and the C phase winding current are different; and the equivalent cross-sectional area refers to the magnetic flux area passing through the closed magnetic circuit. When the equivalent cross-sectional area of ​​each phase is the same, it means that each closed magnetic circuit can effectively withstand the same magnetic flux density, which can ensure that the magnetic flux flow characteristics of each phase are consistent under dynamic load conditions, avoiding uneven magnetic flux distribution due to differences in cross-sectional areas.

[0052] Reference Figure 2 , the three-phase flux balance winding 6 includes an A-phase sub-flux balance winding 61, a B-phase sub-flux balance winding 62 and a C-phase sub-flux balance winding 63, and the number of turns of the edge differential mode winding 5 is three times the number of turns of the A-phase sub-flux balance winding 61, or the B-phase sub-flux balance winding 62, or the C-phase sub-flux balance winding 63;

[0053] The A-phase sub-flux balance winding 61 , the B-phase sub-flux balance winding 62 and the C-phase sub-flux balance winding 63 are concentrically wound in layers on the corresponding edge differential mode magnetic columns 1 .

[0054] It needs to be explained that the differential mode winding 5 is wound on one end of each edge differential mode magnetic column 1, with the number of turns being 3N, and the three-phase flux balance winding 6 is wound on the other end of each edge differential mode magnetic column 1, including the A-phase sub-flux balance winding 61, the B-phase sub-flux balance winding 62 and the C-phase sub-flux balance winding 63, the number of turns of the A-phase sub-flux balance winding 61, the B-phase sub-flux balance winding 62 and the C-phase sub-flux balance winding 63 are all N, and the three-phase flux balance winding 6 adjusts the corresponding magnetic field and disperses the flux density by designing the number of turns, thereby ensuring output balance and reducing magnetic saturation or loss caused by load asymmetry.

[0055] Reference Figure 3 The three-phase flux balance winding 6 includes two of the A-phase sub-flux balance winding 61, the B-phase sub-flux balance winding 62 and the C-phase sub-flux balance winding 63, and the number of turns of the differential mode winding 5 is twice the number of turns of the A-phase sub-flux balance winding 61, the B-phase sub-flux balance winding 62, or the C-phase sub-flux balance winding 63.

[0056] Furthermore, the three-phase flux balance winding 6 wound on the A-phase edge differential mode magnetic column 11 is a first flux balance winding, which includes a B-phase sub-flux balance winding 62 and a C-phase sub-flux balance winding 63; the three-phase flux balance winding 6 wound on the B-phase edge differential mode magnetic column 12 is a second flux balance winding, which includes an A-phase sub-flux balance winding 61 and a C-phase sub-flux balance winding 63; the three-phase flux balance winding 6 wound on the C-phase edge differential mode magnetic column 13 is a third flux balance winding, which includes an A-phase sub-flux balance winding 61 and a B-phase sub-flux balance winding 62.

[0057] It needs to be explained that, since one phase of the three-phase flux balancing winding 6 on each edge differential-mode magnetic column 1 has the same current as the corresponding differential-mode winding 5, but the winding direction is opposite, the two can offset each other at this time, that is, the A-phase sub-flux balancing winding 61 in the first flux balancing winding can offset part of the A-phase differential-mode winding 51, the B-phase sub-flux balancing winding 62 in the second flux balancing winding can offset part of the B-phase differential-mode winding 52, and the C-phase sub-flux balancing winding 63 in the third flux balancing winding can offset part of the C-phase differential-mode winding 53. At this time, even if the current flowing through the A-phase winding, the B-phase winding current and the C-phase winding current are different, the magnetic flux flowing through the first yoke 3, the second yoke 4 and the center common-mode magnetic column 2 is also zero.

[0058] Furthermore, the B-phase sub-magnetic flux balancing winding 62 and the C-phase sub-magnetic flux balancing winding 63 on the A-phase edge differential mode magnetic column 11 are layered and concentrically wound on the A-phase edge differential mode magnetic column 11, the A-phase sub-magnetic flux balancing winding 61 and the C-phase sub-magnetic flux balancing winding 63 on the B-phase edge differential mode magnetic column 12 are layered and concentrically wound on the B-phase edge differential mode magnetic column 12, and the A-phase sub-magnetic flux balancing winding 61 and the B-phase sub-magnetic flux balancing winding 62 on the C-phase edge differential mode magnetic column 13 are layered and concentrically wound on the C-phase edge differential mode magnetic column 13.

[0059] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A three-phase differential mode magnetic integrated inductor, characterized in that: The invention comprises three edge differential mode magnetic columns (1), a central common mode magnetic column (2), a first magnetic yoke (3) and a second magnetic yoke (4); the three edge differential mode magnetic columns (1) and the central common mode magnetic column (2) are all arranged between the first magnetic yoke (3) and the second magnetic yoke (4) and are parallel to each other; and the magnetic permeabilities of the central common mode magnetic column (2), the first magnetic yoke (3) and the second magnetic yoke (4) are all greater than the magnetic permeability of the edge differential mode magnetic column (1); Each of the edge differential mode magnetic columns (1) is wound with a differential mode winding (5) and a three-phase magnetic flux balance winding (6) corresponding to the differential mode winding (5); the winding direction of the three-phase magnetic flux balance winding (6) is opposite to that of the corresponding differential mode winding (5); the magnetic permeability of the differential mode windings (5) wound on the three edge differential mode magnetic columns (1) is the same; the three-phase magnetic flux balance winding (6) comprises an A-phase sub-magnetic flux balance winding (61), A B-phase sub-magnetic flux balancing winding (62) and a C-phase sub-magnetic flux balancing winding (63), wherein the number of turns of the A-phase sub-magnetic flux balancing winding (61), the B-phase sub-magnetic flux balancing winding (62) and the C-phase sub-magnetic flux balancing winding (63) are all the same, and the number of turns of the differential mode winding (5) is three times the number of turns of the A-phase sub-magnetic flux balancing winding (61), or the B-phase sub-magnetic flux balancing winding (62), or the C-phase sub-magnetic flux balancing winding (63); The three edge differential mode magnetic columns (1) are respectively an A-phase edge differential mode magnetic column (11), a B-phase edge differential mode magnetic column (12) and a C-phase edge differential mode magnetic column (13); the differential mode winding (5) wound on the A-phase edge differential mode magnetic column (11) is an A-phase differential mode winding (51); the differential mode winding (5) wound on the B-phase edge differential mode magnetic column (12) is a B-phase differential mode winding (52); the differential mode winding (5) wound on the C-phase edge differential mode magnetic column (13) is a C-phase differential mode winding (53); the A-phase current of the three-phase current flows through the A-phase differential mode winding (51), so that the A-phase edge differential mode magnetic column (11), the central common mode magnetic column (2) and the first magnetic yoke (3) are connected to each other. and the second magnetic yoke (4) form an A-phase closed magnetic circuit, the B-phase current of the three-phase current flows through the B-phase differential mode winding (52) so that the B-phase edge differential mode magnetic column (12), the center common mode magnetic column (2), the first magnetic yoke (3) and the second magnetic yoke (4) form a B-phase closed magnetic circuit, the C-phase current of the three-phase current flows through the C-phase differential mode winding (53) so that the C-phase edge differential mode magnetic column (13), the center common mode magnetic column (2), the first magnetic yoke (3) and the second magnetic yoke (4) form a C-phase closed magnetic circuit, and the equivalent magnetic circuit lengths and equivalent cross-sectional areas of the A-phase closed magnetic circuit, the B-phase closed magnetic circuit and the C-phase closed magnetic circuit are all the same; The A-phase sub-magnetic flux balancing winding (61), the B-phase sub-magnetic flux balancing winding (62), and the C-phase sub-magnetic flux balancing winding (63) are layered and concentrically wound on the corresponding edge differential mode magnetic columns (1).

2. The three-phase differential mode magnetic integrated inductor according to claim 1, characterized in that: The edge differential mode magnetic column (1) is made of alloy magnetic powder, and the first magnetic yoke (3), the second magnetic yoke (4) and the center common mode magnetic column (2) are all made of one of amorphous material, nanocrystalline material and silicon steel.

3. The three-phase differential mode magnetic integrated inductor according to claim 1, characterized in that: The differential mode windings (5) on the three edge differential mode magnetic columns (1) have the same winding direction and the same number of turns.

4. The three-phase differential mode magnetic integrated inductor according to claim 1, characterized in that: A phase current flows through each of the differential mode windings (5) on the three edge differential mode magnetic columns (1), and a phase difference between each phase current flowing through the differential mode windings (5) on the three edge differential mode magnetic columns (1) is 120°.

5. The three-phase differential mode magnetic integrated inductor according to claim 4, characterized in that: The winding direction of each differential mode winding (5) is the same as the flow direction of the corresponding single-phase current.

6. The three-phase differential-mode magnetic integrated inductor according to claim 1, characterized in that: The three-phase flux balancing winding (6) wound on the A-phase edge differential mode magnetic column (11) is a first flux balancing winding, the first flux balancing winding includes a B-phase sub-flux balancing winding (62) and a C-phase sub-flux balancing winding (63); the three-phase flux balancing winding (6) wound on the B-phase edge differential mode magnetic column (12) is a second flux balancing winding, the second flux balancing winding includes an A-phase sub-flux balancing winding (61) and a C-phase sub-flux balancing winding (63); the three-phase flux balancing winding (6) wound on the C-phase edge differential mode magnetic column (13) is a third flux balancing winding, the third flux balancing winding includes an A-phase sub-flux balancing winding (61) and a B-phase sub-flux balancing winding (62).

7. The three-phase differential mode magnetic integrated inductor according to claim 6, characterized in that: The B-phase sub-magnetic flux balancing winding (62) and the C-phase sub-magnetic flux balancing winding (63) on the A-phase edge differential mode magnetic column (11) are layered and concentrically wound on the A-phase edge differential mode magnetic column (11); the A-phase sub-magnetic flux balancing winding (61) and the C-phase sub-magnetic flux balancing winding (63) on the B-phase edge differential mode magnetic column (12) are layered and concentrically wound on the B-phase edge differential mode magnetic column (12); and the A-phase sub-magnetic flux balancing winding (61) and the B-phase sub-magnetic flux balancing winding (62) on the C-phase edge differential mode magnetic column (13) are layered and concentrically wound on the C-phase edge differential mode magnetic column (13).

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