CN115410805A

CN115410805A - Multiphase coupling inductor and multiphase interleaving DCDC converter

Info

Publication number: CN115410805A
Application number: CN202211216959.XA
Authority: CN
Inventors: 张明准
Original assignee: Suzhou Huichuan Control Technology Co Ltd
Current assignee: Suzhou Huichuan Control Technology Co Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2022-11-29

Abstract

The invention discloses a multiphase coupling inductor and a multiphase interleaved DCDC converter, wherein the multiphase coupling inductor comprises a plurality of splicing blocks and a multiphase winding, the splicing blocks are provided with at least three magnetic columns, and at least one splicing block in the splicing blocks is used for forming a two-phase coupling inductor; each phase winding is respectively wound on at least three magnetic columns to form a multi-phase coupling inductor, wherein any two phases of coupling inductors in the multi-phase coupling inductor have a counter-coupling characteristic. The technical scheme of the invention can solve the problem that the multiphase coupling inductor is easy to deform when being longer, so as to reduce the manufacturing difficulty and improve the coupling balance among the multiphase couplings.

Description

Multiphase coupling inductor and multiphase interleaving DCDC converter

Technical Field

The invention relates to the technical field of inductors, in particular to a multiphase coupling inductor and a multiphase interleaved DCDC converter.

Background

The DCDC converter is a voltage converter that converts an input voltage and effectively outputs a fixed voltage. In the circuit of the multiphase interleaving DCDC converter, each phase circuit needs to be connected with an inductor. For smaller volumes, multiphase coupled inductors integrating multiple inductors have emerged.

The existing multiphase coupling inductor comprises two oppositely arranged cover plates, a plurality of magnetic columns and a plurality of windings, wherein the magnetic columns are connected with the two cover plates, and each magnetic column is wound with one winding to form an inductor. When the number of phases of the coupled inductor continues to increase, the number of the magnetic columns is increased, so that the length of the whole multi-phase coupled inductor is increased, magnetic fluxes in the two cover plates can be mutually offset, the thickness of the two cover plates does not need to be increased along with the increase of the number of the phases, the ratio of the length to the thickness of the cover plates is increased along with the increase of the number of the phases, and when the ratio of the length to the thickness is larger, the existing manufacturing process level is difficult to ensure that the multi-phase coupled inductor cannot deform, higher manufacturing precision is needed, and the manufacturing is difficult.

Disclosure of Invention

The invention mainly aims to provide a coupling inductor and a multiphase interleaved DCDC converter, aiming at solving the problem that the multiphase coupling inductor is easy to deform when being longer so as to reduce the manufacturing difficulty.

In order to achieve the above object, the present invention provides a multiphase coupling inductor comprising:

the magnetic pole type transformer comprises a plurality of splicing blocks, a plurality of magnetic pole pieces and a plurality of magnetic pole pieces, wherein the splicing blocks are provided with at least three magnetic poles, and at least one splicing block is used for forming a two-phase coupling inductor; and

and each phase winding is wound on the at least three magnetic columns respectively and is used for forming the multi-phase coupling inductor, wherein any two phases of coupling inductors in the multi-phase coupling inductor have a counter-coupling characteristic.

Optionally, the plurality of tiles comprises: the magnetic pole splicing structure comprises at least one first type splicing block and at least one second type splicing block, wherein the first type splicing block is provided with two magnetic poles arranged in parallel, and the second type splicing block is provided with one magnetic pole.

Optionally, the plurality of tiles further comprises: the auxiliary splicing blocks are used for connecting two adjacent splicing blocks;

when the plurality of splicing blocks comprise a plurality of first type splicing blocks, an auxiliary splicing block is arranged between every two adjacent first type splicing blocks.

Optionally, when the plurality of tiles includes a plurality of first tiles and a plurality of second tiles, the second tiles are sandwiched between the two first tiles.

Optionally, the plurality of tiles has three magnetic pillars;

the multi-phase winding is provided with three windings, each phase of winding comprises at least two winding sections, and the winding sections of different phases are alternately wound on the same magnetic pole.

Optionally, each phase of the winding includes two winding segments, one winding segment on a first magnetic pole is connected in series with one winding segment on a second magnetic pole, another winding segment on the second magnetic pole is connected in series with one winding segment on a third magnetic pole, another winding segment on the third magnetic pole is connected in series with another winding segment on the first magnetic pole, and magnetic fluxes generated by currents in the two winding segments connected in series strengthen each other;

or, each phase of the winding comprises three winding segments;

a second winding wire segment is clamped between the first winding wire segment and the third winding wire segment on the first magnetic column;

a second winding segment is clamped between the first winding segment and the third winding segment on the second magnetic column;

a second winding segment is clamped between the first winding segment and the third winding segment on the third magnetic column;

the first winding section of the first magnetic column is connected with the third winding section of the first magnetic column and the second winding section of the second magnetic column in series, the first winding section of the second magnetic column is connected with the third winding section of the second magnetic column and the second winding section of the third magnetic column in series, the first winding section of the third magnetic column is connected with the third winding section of the third magnetic column and the second winding section of the first magnetic column in series, and magnetic fluxes generated by currents in the three winding sections connected in series are mutually strengthened.

Optionally, the splicing block includes two magnetic core units arranged oppositely, the two magnetic core units are arranged at an interval to form a first air gap, and the first air gap is used for adjusting the magnetic permeability of the magnetic column.

Optionally, the plurality of tiles comprises: the magnetic coupling structure comprises a pair of E-shaped magnetic cores and a pair of F-shaped magnetic cores, wherein the pair of E-shaped magnetic cores are spliced to form a first splicing block, the first splicing block is provided with two magnetic columns and a decoupling magnetic column which are arranged in parallel, the decoupling magnetic column is arranged between two adjacent magnetic columns, the pair of F-shaped magnetic cores are spliced to form a second splicing block, the second splicing block is provided with one magnetic column and one decoupling magnetic column, and the decoupling magnetic column is used for adjusting the leakage flux between two adjacent coupling inductors;

or, the plurality of tiles comprise: the multi-phase coupling inductor comprises two pairs of E-shaped magnetic cores and a pair of T-shaped magnetic cores, wherein the two pairs of E-shaped magnetic cores are respectively spliced to form two first splicing blocks, each first splicing block is provided with two magnetic columns and a decoupling magnetic column which are arranged in parallel, the decoupling magnetic columns are arranged between two adjacent magnetic columns, the two T-shaped magnetic cores are spliced to form a third splicing block, each third splicing block is provided with a decoupling magnetic column, and one third splicing block is arranged between two adjacent first splicing blocks in the length direction of the multi-phase coupling inductor;

or, the plurality of tiles comprises: two pairs of E type magnetic cores, a pair of T type magnetic core and a pair of F type magnetic core, a pair of E type magnetic core concatenation forms first concatenation piece, first concatenation piece has two that set up side by side magnetic column and a decoupling magnetic column, the decoupling magnetic column sets up adjacent two between the magnetic column, a pair of F type magnetic core concatenation forms the second concatenation piece, the second concatenation piece has one magnetic column and a decoupling magnetic column, a pair of T type magnetic core concatenation forms the third concatenation piece, the third concatenation piece has a decoupling magnetic column the length direction of heterogeneous coupling inductance is upwards, adjacent two be equipped with one between the first concatenation piece the third concatenation piece, the second concatenation piece is located the head end or the end that the length direction of heterogeneous coupling inductance was arranged.

Optionally, the decoupling magnetic cylinder has a second air gap for adjusting a leakage inductance.

The present invention further provides a multiphase interleaved DCDC converter, including a multiphase coupling inductor, where the multiphase coupling inductor includes:

and each phase winding is wound on the at least three magnetic columns respectively to form the multi-phase coupling inductor, wherein any two phases of coupling inductors in the multi-phase coupling inductor have a decoupling characteristic.

The technical scheme of the invention is that the multi-phase coupling inductor comprises a plurality of splicing blocks and a multi-phase winding, wherein the splicing blocks are provided with at least three magnetic columns, and at least one splicing block in the splicing blocks is used for forming the two-phase coupling inductor; each phase winding is respectively wound on at least three magnetic columns to form a multi-phase coupling inductor, wherein any two phases of coupling inductors in the multi-phase coupling inductor have a decoupling characteristic. The three-phase coupling inductor or the coupling inductor more than three phases is formed by splicing a plurality of splicing blocks, and the length of the splicing blocks cannot be too long because the multi-phase coupling inductor is formed by splicing a plurality of splicing blocks, so that the splicing blocks are not easy to deform in the manufacturing process, high precision is not needed, and the manufacturing is convenient, thereby solving the problem that the multi-phase coupling inductor is easy to deform when being longer, and reducing the manufacturing difficulty. In addition, as any two magnetic columns can be mutually reversely coupled, the current ripple in the inductor can be reduced, and the reduction of the ripple current of the inductor can reduce the switching loss of the switching device.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a multi-phase coupling inductor according to the present invention;

FIG. 2 is a schematic diagram of a structure of a multi-phase coupling inductor removing winding in FIG. 1;

fig. 3a is a schematic diagram of the winding current direction of the multi-phase coupling inductor in fig. 1;

FIG. 3b is an equivalent circuit diagram of the multi-phase coupled inductor shown in FIG. 1;

FIG. 4a is a schematic diagram showing the winding current direction of another embodiment of the multi-phase coupled inductor of the present invention;

FIG. 4b is an equivalent circuit diagram of the multi-phase coupled inductor shown in FIG. 4 a;

fig. 5 is a schematic diagram of the winding current direction of a further embodiment of the multiphase coupled inductor of the present invention;

fig. 6a is a schematic structural diagram of a multiphase coupling inductor according to an embodiment of the invention, in which a U-shaped magnetic core and an L-shaped magnetic core are spliced to form a three-phase coupling inductor;

FIG. 6b is a schematic diagram showing the winding current direction of the multi-phase coupled inductor in FIG. 6 a;

FIG. 7 is an exploded view of the poly-phase coupled inductor of FIG. 6 a;

FIG. 8 is a schematic structural diagram of an embodiment of a four-phase coupled inductor formed by splicing an E-shaped magnetic core and a T-shaped magnetic core;

fig. 9a is an exploded view of the poly-phase coupled inductor of fig. 8;

fig. 9b is a schematic diagram of the winding current direction of the multi-phase coupling inductor in fig. 8;

FIG. 10a is a schematic structural diagram of an embodiment of a six-phase coupled inductor formed by splicing an E-shaped magnetic core and a T-shaped magnetic core;

FIG. 10b is an exploded view of an embodiment of the polyphase coupled inductor in FIG. 10 a;

fig. 10c is a schematic diagram of the winding current direction of the polyphase coupled inductor in fig. 10 a;

fig. 11 is a schematic structural diagram of an embodiment in which a U-shaped magnetic core and an I-shaped magnetic core are spliced to form a four-phase coupling inductor;

fig. 12a is an exploded view of the poly-phase coupled inductor of fig. 11;

fig. 12b is a schematic diagram of the winding current direction of the multi-phase coupling inductor in fig. 11;

FIG. 13 is a schematic structural diagram of an embodiment of a six-phase coupled inductor formed by splicing a U-shaped magnetic core and an I-shaped magnetic core;

FIG. 14a is an exploded view of the poly-phase coupled inductor of FIG. 13;

fig. 14b is a schematic diagram of the winding current direction of the multi-phase coupling inductor in fig. 13;

fig. 15 is a schematic structural diagram of an embodiment in which a U-shaped magnetic core and a T-shaped magnetic core are spliced to form a five-phase coupling inductor;

fig. 16a is an exploded view of the poly-phase coupled inductor of fig. 15;

fig. 16b is a schematic diagram of the winding current direction of the multi-phase coupled inductor of fig. 15;

fig. 17 is a schematic structural diagram of an embodiment in which a five-phase coupling inductor is formed by splicing a U-shaped magnetic core, an I-shaped magnetic core, and an L-shaped magnetic core;

fig. 18a is an exploded view of the poly-phase coupled inductor of fig. 17;

fig. 18b is a schematic diagram of the winding current direction of the poly-phase coupled inductor of fig. 17;

FIG. 19 is a schematic diagram of an embodiment of a five-phase coupled inductor formed by splicing a U-shaped core, a T-shaped core, and an F-shaped core;

fig. 20a is an exploded view of the poly-phase coupled inductor of fig. 19;

fig. 20b is a schematic diagram of the winding current direction of the poly-phase coupled inductor of fig. 19;

fig. 21 is a circuit diagram of an embodiment of a bidirectional multiphase interleaved Buck-Boost topology circuit of the multiphase interleaved DCDC converter of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

In addition, the descriptions relating to "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a multiphase coupling inductor aiming at solving the technical problem reflected by the background technology, and aims to solve the problem that the multiphase coupling inductor is easy to deform when being long.

The specific structure of the multiphase coupling inductor proposed by the present invention will be described in the following specific embodiments:

as shown in fig. 1, fig. 6a, fig. 8, fig. 11, fig. 13, fig. 15, fig. 17 and fig. 19, in an embodiment of the multiphase coupling inductor 100 of the present invention, the multiphase coupling inductor 100 includes a plurality of tiles 10 and a multiphase winding 13, the plurality of tiles 10 has at least three magnetic columns 11, and at least one tile 10 of the plurality of tiles 10 is used to form a two-phase coupling inductor; each phase winding 13 is respectively wound on at least three magnetic columns 11 for forming the multi-phase coupling inductor 100, wherein any two phase coupling inductors in the multi-phase coupling inductor 100 have a decoupling characteristic.

In the present embodiment, the decoupling refers to a decoupling relationship between two phase inductances when magnetic fluxes generated by currents in the two windings 13 cancel each other in the magnetic pole 11. For example: when the current in the three-phase winding 13 flows in the direction shown in fig. 3a, the magnetic flux of the first phase winding 13 is upward, the magnetic flux of the second phase winding 13 is also upward, the magnetic fluxes generated by the first phase winding 13 and the second phase winding 13 cancel each other in the magnetic pillar 11, and the first phase winding 13 and the second phase winding 13 are in a counter-coupling relationship.

In this embodiment, splice in proper order along the length direction of heterogeneous coupling inductance 100 through a plurality of splices 10, so that a plurality of magnetic columns 11 set up side by side along heterogeneous coupling inductance 100's length in proper order, in order to form three-phase coupling inductance or be greater than three-phase coupling inductance, because heterogeneous coupling inductance 100 is formed by the concatenation of a plurality of splices 10, the length of single splice 10 can not be too long, thereby be difficult to warp in the splice 10 manufacturing process, need not high accuracy, be convenient for make, thereby can solve the easy problem that warp of heterogeneous coupling inductance 100 when longer, in order to reduce the manufacturing difficulty. In addition, since any two magnetic poles 11 can be coupled in an opposite direction, current ripples in the inductor can be effectively reduced, and the reduction of the current ripples in the inductor can reduce the switching loss of the switching device. Meanwhile, magnetic fluxes generated by currents in the multi-phase winding 13 are mutually offset, and the multi-phase coupling inductor 100 works in a multi-phase decoupling state, so that the problem of coupling balance among multi-phase couplings can be solved.

In one embodiment, the direction of current flow in the winding 13 wound by each leg 11 may be the same. It is understood that the current direction in the winding 13 wound by each magnetic pillar 11 may also be different, and may be specifically designed according to the actual situation, which is not limited in the embodiment of the present specification.

In one embodiment, when the currents of the three-phase windings 13 in the three-phase coupling inductor flow in the directions shown in fig. 3a, the magnetic fluxes generated by the currents in the three-phase windings 13 cancel each other, the three-phase coupling inductor operates in a three-phase decoupling state, and any two-phase coupling inductors have a decoupling characteristic therebetween. The manner of implementing the decoupling characteristic between any two coupled inductors in the multi-phase coupled inductor 100 is not limited to the examples in the embodiments of the present disclosure, and other modifications are possible for those skilled in the art based on the teachings of the embodiments of the present disclosure, but all that can be achieved with the same or similar functions and effects as the embodiments of the present disclosure should be covered by the scope of the embodiments of the present disclosure.

In one embodiment, the magnetic cylinder 11 is used to wind a coil. The decoupling magnetic pole 30 is not wound with a coil, and the decoupling magnetic pole 30 can adjust the leakage inductance, namely the leakage magnetic flux, by arranging an air gap or adopting a material with lower magnetic conductivity than the magnetic pole 11. The plurality of tiles 10 are used for being spliced together to form a main body of the multi-phase coupling inductor 100. Wherein, the splicing block 10 can have a magnetic column 11; the splice 10 may also have a decoupling magnetic post 30; the splicing block 10 can also be provided with a magnetic column 11 and a decoupling magnetic column 30; the splice 10 may also have neither a magnetic post 11 nor a decoupling magnetic post 30, but rather serve as a connection. When the splice 10 has the magnetic columns 11, the number of the splice 10 provided with the magnetic columns 11 can be 1, 2, 3, 4, 5, etc., and those skilled in the art can set the splice according to actual requirements. When the tiles 10 have the decoupling magnetic posts 30, the number of the tiles 10 provided with the decoupling magnetic posts 30 may be 1. When the splice block 10 has the magnetic pillars 11 and the decoupling magnetic pillars 30 at the same time, the number of the magnetic pillars 11 may be 1, 2, 3, 4, 5, etc., and the number of the decoupling magnetic pillars 30 may be 1, 2, 3, 4, 5, etc., wherein one decoupling magnetic pillar 30 is disposed between two magnetic pillars 11, and the number of the magnetic pillars 11 and the number of the decoupling magnetic pillars 30 may be set by those skilled in the art according to actual requirements. The plurality of splicing blocks 10 are spliced in sequence along the length direction of the multiphase coupling inductor 100, and the length direction of the multiphase coupling inductor 100 is the left-right direction in the figure. The number of the splicing blocks 10 can be 2, 3, 4, 5, etc., and can be set by those skilled in the art according to actual requirements. A plurality of magnetic columns 11 are arranged side by side in sequence along the length of the multiphase coupling inductor 100, the axial direction of each magnetic column 11 is the width direction of the multiphase coupling inductor 100, such as the front-back direction in the figure, and then a plurality of magnetic columns 11 are arranged side by side in sequence along the length direction of the multiphase coupling inductor 100. Each magnetic pole 11 is wound with a winding 13 to form each inductor, i.e., a magnetic pole 11 is wound with a winding 13 to form an inductor.

In practical applications, the number of the magnetic pillars 11 disposed on each of the splicing blocks 10 may be the same or different, so that the multiphase coupling inductor 100 may be formed in various ways. For example, the first combination: one splicing block 10 is provided with two magnetic columns 11, the other splicing block 10 is provided with one magnetic column 11, and the two splicing blocks are spliced with each other to form a main body of the three-phase coupling inductor. A second combination of: n is defined as a positive integer greater than or equal to 2, and each of the N tiles 10 has two magnetic columns 11. The N-1 pairs of splicing blocks 10 have no magnetic columns 11 or decoupling magnetic columns 30, but play a role in connection. A pair of the splicing blocks 10 without the magnetic columns 11 is arranged between the two splicing blocks 10 with the two magnetic columns 11, and the splicing blocks 10 are spliced in this way to form a main body of the multiphase coupling inductor 100. Therefore, the inductor requirement in the 2N-phase circuit can be met, namely the 2N-phase coupling inductor, large-scale processing and manufacturing are facilitated, and the production efficiency is improved. In a third combination: n is defined as a positive integer greater than or equal to 2, and each of the N tiles 10 has two magnetic pillars 11. The N-1 pairs of splicing blocks 10 have no magnetic columns 11 or decoupling magnetic columns 30, but play a role in connection. Wherein, a pair of splicing blocks 10 without magnetic columns 11 is arranged between the two splicing blocks 10 with two magnetic columns 11, so that the splicing blocks 10 are spliced, and the splicing block 10 with one magnetic column 11 is arranged on the head or tail of the spliced main body, thereby meeting the requirement of inductance in a circuit of 2N +1 phase, namely 2N +1 phase coupling inductance, and having simple structure and convenient processing and manufacturing. Besides the above combination modes, there are also many combination modes, and those skilled in the art can reasonably combine and design the circuit according to the number of phases of the circuit in practical application and the requirement of manufacturing, and this is not limited in the embodiments of the present specification.

In a multiphase circuit, there is a phase difference between the phases, for example: in the three-phase circuit, the phase difference between the phases is 120 degrees, and similarly, in the n-phase circuit, the phase difference between the phases is 360 degrees/n. The invention concentrates the multi-phase inductors on one magnetic element, and can further reduce the current ripple in each phase inductor, thereby reducing the AC loss of a switching device caused by the ripple current and other line AC losses related to the ripple current; meanwhile, compared with a discrete inductor, the multiphase coupling inductor 100 can further reduce the size of the multiphase coupling inductor 100, reduce the installation space and the installation space, and reduce the cost.

It should be noted that the splicing between the splicing blocks 10 may be bonding connection, welding connection, connection by arranging a connection block, or other effective connection manners. The concrete structure of the splice 10 can be set by those skilled in the art according to the actual application requirements. For example, in order to facilitate mass production, the splice 10 with only one magnetic column 11 can be made into a "C" shape or an "i" shape, so that the splice can be directly assembled. Of course, in order to simplify the structure and facilitate the connection, in the connection of the two magnetic columns 11, a connecting block may be disposed between the two splicing blocks 10, that is, two adjacent splicing blocks 10 are connected through the connecting block, so that the structure of the splicing block 10 is simplified and the connection is facilitated.

As shown in fig. 6a, fig. 8, fig. 15, and fig. 17, in an embodiment of the multiphase coupling inductor 100 of the present invention, the plurality of splicing blocks 10 may include: at least one first type of tile 15 and at least one second type of tile 17, wherein the first type of tile 15 may have two magnetic pillars 11 arranged side by side, and the second type of tile 17 may have one magnetic pillar 11.

In this embodiment, the first type of tiles 15 may include E-shaped cores 1015, U-shaped cores 1011, F-shaped cores 1016, and the second type of tiles 17 may include: t-core 1014, I-core 1013, L-core 1012, etc. Of course, it is understood that the first type of tiles 15 and the second type of tiles 17 may also have other possible shapes, which may be determined according to actual requirements, and this is not limited in this embodiment of the present specification.

In this embodiment, each first-type splicing block 15 is provided with two magnetic columns 11 arranged in parallel, each second-type splicing block 17 is provided with one magnetic column 11, and the first-type splicing blocks 15 and the second-type splicing blocks 17 are spliced to form three-phase and odd-phase coupled inductors with more than three-phase coupling inductors. In addition, a reduction in the installed air gap can be combined, so that the degree of imbalance between the phases is reduced.

In practical applications, the number of the first-type splicing blocks 15 may be 0, 1, 2, 3, 4, 5, etc., and those skilled in the art can set the number according to actual requirements. The number of the second type of splicing blocks 17 can be 1, 2, 3, 4, 5, etc., and those skilled in the art can set the splicing blocks according to actual requirements. For example: the two first-type splicing blocks 15 and the second-type splicing block 17 are spliced and can be combined to form a five-phase coupling inductor. Similarly, the seven-phase coupled inductor can be formed by splicing three first-type splicing blocks 15 and one second-type splicing block 17, which is equivalent to splicing one first-type splicing block 15 on one five-phase coupled inductor. Coupling inductors of odd number phases with more than seven phases can be obtained in the same way, and the description is omitted here.

As shown in fig. 8, 13 and 17, in an embodiment of the multiphase coupled inductor 100 of the present invention, the plurality of splicing blocks 10 may further include: the auxiliary splicing blocks 19 are used for connecting two adjacent splicing blocks 10; when the plurality of tiles 10 comprises a plurality of first-type tiles 15, an auxiliary tile 19 may be disposed between two adjacent first-type tiles 15.

In this embodiment, the auxiliary splicing block 19 may be only used for auxiliary connection of two adjacent splicing blocks 10, and the auxiliary splicing block 19 does not have the magnetic pillar 11 for winding the winding 13; the auxiliary splicing blocks 19 may also have decoupling magnetic columns 30, so that the auxiliary splicing blocks 19 may be used to adjust leakage flux. The specific conditions can be determined according to actual conditions, and the implementation of the specification is not limited to the specific conditions.

It can be understood that, when the first type of splicing block 15 is the splicing block 10, an auxiliary splicing block 19 can be arranged between two adjacent first type of splicing blocks 15, the structure of the first type of splicing block 15 can be simplified, the processing and the production are easy, the cost is low, and the modular splicing can be formed, so that the mass production and the manufacturing are convenient, and the production efficiency is improved.

When the plurality of splicing blocks 10 comprise the first type splicing blocks 15 and the second type splicing blocks 17, an auxiliary splicing block 19 can be arranged between every two adjacent first type splicing blocks 15, the structure of the first type splicing blocks 15 can be simplified, the processing and the production are easy, the cost is low, and the modular splicing can be formed, so that the mass production and the manufacturing are convenient, and the production efficiency is improved.

In practical application, the auxiliary splicing blocks 19 can be manufactured into a uniform shape, so that mass production and manufacturing are facilitated, and the production efficiency is improved. Specifically, two auxiliary splicing blocks 19 are arranged between two first-type splicing blocks 15, that is, two adjacent splicing blocks 10 are connected through the two auxiliary splicing blocks 19, and the two auxiliary splicing blocks 19 are respectively located at two side edges of the first-type splicing blocks 15 along the axial direction of the magnetic column 11. Of course, the number of the auxiliary splicing blocks 19 can be 1, 2, 3, 4, 5, etc., and those skilled in the art can set the number according to actual requirements.

As shown in fig. 15, in an embodiment of the multiphase coupled inductor 100 according to the present invention, when the plurality of tiles 10 includes a plurality of first-type tiles 15 and a plurality of second-type tiles 17, the second-type tiles 17 may be sandwiched between the first-type tiles 15.

When the plurality of splicing blocks 10 comprise a plurality of first splicing blocks 15 and second splicing blocks 17, the second splicing blocks 17 are clamped between the two first splicing blocks 15, so that odd phase coupling inductance more than three phases can be formed through splicing, and compared with coupling inductance formed by sequentially splicing the splicing blocks 10 with only one magnetic column 11, the invention can reduce assembly air gaps and reduce the unbalance degree between phases. Magnetic fluxes generated by currents in the phase windings 13 cancel each other, and thereby the phases of the multi-phase coupling inductor 100 can be coupled in reverse. In addition, only one second type of splicing block 17 and a plurality of same first type of splicing blocks 15 need to be produced during manufacturing, so that mass production and manufacturing can be facilitated, and the production efficiency is improved.

In this embodiment, the number of the first-type splicing blocks 15 may be 1, 2, 3, 4, 5, etc., and those skilled in the art may set the number according to actual requirements. The second type of splicing block 17 is clamped between the two first type of splicing blocks 15, the second type of splicing block 17 can be of an I-shaped structure, so that the second type of splicing block 17 can be connected between the two adjacent first type of splicing blocks 15, the connection mode can be bonding or welding, and can also be other effective connection modes, furthermore, the second type of splicing block 17 is provided with two opposite side surfaces, one side surface is connected with one first type of splicing block 15, and the other side surface is connected with the other first type of splicing block 15. Or, the second type of splicing block 17 is spliced at the head or tail of the first type of splicing blocks 15, and the second type of splicing block 17 can be in a C-shaped structure, so that the second type of splicing block 17 is connected with the first type of splicing blocks 15 conveniently, and the connection mode can be bonding, welding or other effective connection modes. The shapes of the first type splicing blocks 15 and the second type splicing blocks 17 are simple, so the processing and the production are easy, and the cost is low.

FIG. 3b is a schematic equivalent magnetic circuit diagram of the core of FIG. 3a, because the magnetic permeability of the magnetic material is high and the magnetic reluctance of the magnetic material is much smaller than the air gap reluctance, which is ignored here for qualitative explanation purposes. As shown in fig. 3b, part of the main flux of the first phase winding 13

Through the second phase winding 13 and coupled to the second phase winding 13; part of the main flux of the first phase winding 13

Through the third phase winding 13 and coupled to the third phase winding 13; part of the main flux of the second phase winding 13

Through the third phase winding 13 and coupled to the third phase winding 13; i.e. magnetic flux

Is the mutual magnetic flux between the first phase winding 13 and the second phase winding 13

Is the mutual magnetic flux between the first phase winding 13 and the third phase winding 13, the magnetic flux

Is the flux interaction between the second phase winding 13 and the third phase winding 13; because there is an assembly air gap between the "EE" type core and the "FF" type core, there is an air gap reluctance R330 between the two pairs of tiles.

As shown in fig. 3b, the mutual magnetic flux

And mutual magnetic flux

Are mutually magnetic flux through air gap reluctance R330

Without passing through the air gap reluctance R330. The presence of the air-gap reluctance R330 thus enables a mutual magnetic flux between the first phase winding 13 and the second phase winding 13

The mutual magnetic flux between the first phase winding 13 and the third phase winding 13

The mutual magnetic flux between the second phase winding 13 and the third phase winding 13

Are not equal. Flux of mutual magnetic flux

Greater than mutual magnetic flux

And is greater than

That is, the coupling performance between the first phase winding 13 and the second phase winding 13 is stronger than the coupling performance between the first phase winding 13 and the third phase winding 13 and also stronger than the coupling performance between the second phase winding 13 and the third phase winding 13. That is, the leakage inductance between the first phase winding 13 and the second phase winding 13 is smaller than the leakage inductance between the first phase winding 13 and the third phase winding 13, and is also smaller than the leakage inductance between the second phase winding 13 and the third phase winding 13. The unbalanced coupling among the three phases can cause the three-phase inductive current ripple to be asymmetric, and finally can cause the unbalanced alternating current loss of a switching device in a three-phase circuit, the unbalanced thermal stress of the device and the influence on the reliability of the circuit. Moreover, the efficiency of the multiphase interleaved parallel converter is not improved, and therefore, the assembly air gap between the splicing blocks needs to be reduced as much as possible. One way to reduce the assembly air gap is to grind the combined faces to a near specular surface, which increases the cost of manufacturing the tiles.

Based on this, as shown in fig. 4a and fig. 4b, in an embodiment of the multiphase coupling inductor 100 of the present invention, the plurality of tiles 10 may have three magnetic columns. In some embodiments, the plurality of tiles 10 may include a first type of tile 15 and a second type of tile 17, the first type of tile 15 having two magnetic pillars 11 arranged in parallel, and the second type of tile 17 having one magnetic pillar 11.

In the present embodiment, three windings 13 may be provided, and each winding 13 includes two coil segments 131. Wherein, a winding segment 131 on the first magnetic pillar 11 is connected in series with a winding segment 131 on the second magnetic pillar 11 (two winding segments of current label I1 in fig. 4a are connected in series). Another winding segment 131 on the second magnetic pillar 11 is connected in series with a winding segment 131 on the third magnetic pillar 11 (the two winding segments of current label I2 in fig. 4a are connected in series). The other winding segment 131 on the third magnetic pillar 11 is connected in series with the other winding segment 131 on the first magnetic pillar 11 (the two winding segments of current label I3 in fig. 4a are connected in series). The magnetic fluxes generated by the currents in the two coil segments 131 connected in series reinforce each other.

In the present embodiment, in the three-coupled inductor, a winding segment 131 on the first magnetic pillar 11 is connected in series with a winding segment 131 on the second magnetic pillar 11, another winding segment 131 on the second magnetic pillar 11 is connected in series with a winding segment 131 on the third magnetic pillar 11, another winding segment 131 on the third magnetic pillar 11 is connected in series with another winding segment 131 on the first magnetic pillar 11, and the directions of currents in the two winding segments 131 connected in series are opposite.

FIG. 4b is a schematic view of the equivalent magnetic circuit of FIG. 4a, showing the mutual magnetic flux between the first and second phases as shown in FIG. 4b

Mainly distributed in the first magnetic pillar 1111 and the second magnetic pillar 1111. Mutual magnetic flux between first and third phases

Mainly distributed in the first magnetic pillar 1111 and the second magnetic pillar 1111. Mutual magnetic flux between the second and third phases

The second magnetic pillar 1111 and the third magnetic pillar 1111 are mainly distributed.

As shown in fig. 4b, the mutual magnetic flux between the first and second phases

Mainly distributed in the first magnetic pillar 11 and the second magnetic pillar 11. Mutual magnetic flux between first and third phases

Mainly distributed in the first magnetic pillar 11 and the second magnetic pillar 11. Mutual magnetic flux between the second and third phases

Mainly distributed in the second magnetic pillar 11 and the third magnetic pillar 11. Of the three sets of mutual magnetic fluxes, only the second phaseAnd a third phase

Part of the flux passes through the assembled air gap reluctance R330. Therefore, the difference between the mutual magnetic fluxes of the three magnetic columns 11 is small, the problem of unbalanced coupling among three phases is effectively solved, the three-phase inductive current ripple difference is reduced, the efficiency of the three-phase interleaved converter is improved, and the stress balance of a switching device in a three-phase circuit is facilitated. Meanwhile, because the different-phase windings 13 are arranged on the same magnetic pole 11, the alternating current ripples in the windings 13 can be mutually offset to a certain extent, which is beneficial to reducing the alternating current loss of the windings 13 and improving the efficiency.

In one embodiment, a first type of splicing block 15 and a second type of splicing block 17 can be spliced in parallel, two magnetic columns 11 are arranged on the first type of splicing block 15, one magnetic column 11 is arranged on the second type of splicing block 17, after splicing, the three magnetic columns 11 are sequentially arranged, and a winding 13 is wound on each magnetic column 11, so that a three-phase coupling inductor is formed. In practical applications, the first phase circuit is connected to two winding segments 131, wherein one winding segment 131 is wound around the first magnetic column 11, and the other winding segment 131 is wound around the second magnetic column 11; two winding segments 131 are connected to the second phase circuit, wherein one winding segment 131 is wound around the second magnetic column 11, and the other winding segment 131 is wound around the third magnetic column 11; two winding segments 131 are connected to the third phase circuit, wherein one winding segment 131 is wound around the third magnetic pole 11, and the other winding segment 131 is wound around the first magnetic pole 11.

In practical applications, because the multi-phase coupling inductor is formed by splicing a plurality of splicing blocks in parallel, an assembly gap exists, as shown in an equivalent circuit of fig. 3b, the assembly gap is a magnetic resistance R at a corresponding position, because the assembly gap exists between two adjacent phases, the coupling between the two adjacent phases is stronger than the coupling between the two non-adjacent phases, unequal coupling inductances of different phases are caused by unequal coupling, unequal inductances of different phases cause unequal ripple currents in different phases, which causes different losses in different corresponding switching devices, different thermal stresses of the switching devices of different phases are different, and finally, the reliability of the switching devices is affected. The unbalanced coupling among the three phases can cause the three-phase inductive current ripple to be asymmetric, and finally can cause the unbalanced alternating current loss of a switching device in a three-phase circuit and the unbalanced thermal stress of the device to influence the reliability of the circuit; meanwhile, the efficiency of the multiphase interleaving parallel converter is not improved; it is therefore desirable to minimize the assembly gap between the first type of tiles 15 and one of the second type of tiles 17. Therefore, in the three-phase coupling inductor, the windings are arranged in a staggered manner to realize the coupling balance between any two phases, so that the performance of the coupling inductor can be exerted to the maximum extent, and the problem of unbalanced stress of the switching devices corresponding to different phases is solved; the efficiency of the Buck/Buck-Boost power supply is improved. Meanwhile, the magnetic column 11 in the proposed scheme has high utilization rate, uniform magnetic flux density distribution and small loss of the magnetic column 11, and can further improve the efficiency of the power converter; the scheme of the invention is flexible, and the multiphase coupling inductor 100 with different phases can be conveniently formed according to requirements without repeated die sinking to manufacture the magnetic column 11, so that any multiphase coupling inductor 100 can be formed by modularized splicing.

It should be noted that the number of layers of the winding coil of the winding segment 131 may be 1 layer, 2 layers, 3 layers, 4 layers, 5 layers, etc., and those skilled in the art can set the number according to actual needs.

As shown in fig. 5, in an embodiment of the multi-phase coupled inductor 100 of the present invention, each phase of the winding 13 includes three winding segments 131. In the first magnetic pole 11, the second coil segment 131 is sandwiched between the first coil segment 131 and the third coil segment 131. In the second magnetic column 11, the second winding segment 131 is sandwiched between the first winding segment 131 and the third winding segment 131. In the third magnetic pole 11, a second coil segment 131 is sandwiched between the first coil segment 131 and the third coil segment 131.

The first winding segment 131 of the first magnetic pillar 11 is connected in series with the third winding segment 131 of the first magnetic pillar 11 and the second winding segment 131 of the second magnetic pillar 11 (the three winding segments 131 of the current label I1 in fig. 4a are connected in series). The first winding segment 131 of the second magnetic pillar 11 is connected in series with the third winding segment 131 of the second magnetic pillar 11 and the second winding segment 131 of the third magnetic pillar 11 (the three winding segments 131 of the current label I2 in fig. 4a are connected in series). The first winding segment 131 of the third magnetic pillar 11 is connected in series with the third winding segment 131 of the third magnetic pillar 11 and the second winding segment 131 of the first magnetic pillar 11 (the three winding segments 131 of current label I3 in fig. 4a are connected in series). The magnetic fluxes generated by the currents in the three coil segments 131 connected in series reinforce each other.

It can be understood that, as shown in fig. 5, there are three winding segments 131 on each magnetic pole 11, and the current direction of the middle winding segment 131 is opposite to the current direction of the winding segments 131 at the two ends, so that a part of the magnetic flux is cancelled, specifically, the different-phase windings 13 are arranged on the same magnetic pole 11, and the ac ripples in the windings 13 can be cancelled to some extent, which helps to reduce the ac loss of the windings 13 and improve the efficiency.

Further, in fig. 5, a current reference I1 is a first phase winding 13, a current reference I2 is a second phase winding 13, and a current reference I3 is a third phase winding 13. Each phase of winding 13 is divided into three parts and arranged on two different magnetic columns 11 in the three magnetic columns 11, and magnetic fluxes between the two parts of the same phase of winding 13 arranged on the different magnetic columns 11 are mutually strengthened; the winding segments 131 of each phase of winding 13 are further staggered, so that the coupling between the phases is enhanced, the problem of unbalanced coupling between the three phases is further improved, the alternating current loss in the winding 13 is further reduced, and the efficiency is improved.

The method can also be continued by dividing each phase winding 13 into M sections, where M >3, interleaving the M sections on two of the three legs 11, further enhancing the coupling between the phases and further reducing the ac losses of the winding 13; however, when M is larger, the manufacturing process of the winding 13 is more complicated, and the relationship between the processing difficulty of the winding 13 and the beneficial effect of the enhanced coupling needs to be comprehensively considered.

As shown in fig. 2, in an embodiment of the multi-phase coupled inductor 100 of the present invention, the splicing block 10 includes two core units 101 disposed opposite to each other, and the two core units 101 are disposed at an interval to form a first air gap 11a, where the first air gap 11a is used for adjusting the permeability of the magnetic pillar 11.

It can be understood that, the first air gap 11a is provided on the magnetic pole 11, and the first air gap 11a is used for adjusting the magnetic permeability of the magnetic pole 11, that is, the main magnetic flux of the magnetic pole 11 can be adjusted, so that the coupling strength can be adjusted.

During design, the required main magnetic flux and the first air gap 11a can be obtained according to the actually required coupling strength. Therefore, the size of the main magnetic flux can be adjusted according to actual requirements, and the coupling strength can be adjusted accordingly.

As shown in fig. 6a and fig. 7, in an embodiment of the polyphase coupled inductor 100 of the present invention, two pieces 10 are provided, the core unit 101 includes a U-shaped core 1011 and an L-shaped core 1012, the two U-shaped pieces have two magnetic pillars 11 arranged in parallel to form one piece 10, and the two L-shaped cores 1012 have one magnetic pillar 11 to form another piece 10.

It can be understood that, two magnetic columns 11 arranged in parallel are spliced through two U-shaped cores to form a splicing block 10, two L-shaped magnetic cores 1012 are spliced to form a magnetic column 11 to form another splicing block 10, so that a three-phase coupling inductor composed of a pair of UU-shaped magnetic cores and a pair of LL-shaped magnetic cores is spliced and formed, magnetic fluxes generated by currents in three-phase windings 13 are mutually offset, the three-phase coupling inductor works in a three-phase counter-coupling state, so that current ripples in the inductor can be reduced, and the reduction of the current ripples of the inductor can reduce the switching loss of a switching device.

Specifically, in the present embodiment, the multi-phase coupling inductor 100 is composed of a pair of "UU" type magnetic cores and a pair of "LL" type magnetic cores; in this embodiment, the first phase winding 13 of the three-phase winding 13 is disposed on a first leg of the "UU" type magnetic core, the second phase winding 13 is disposed on a second leg of the "UU" type magnetic core, and the third phase winding 13 is disposed on a leg of the "LL" type magnetic core. The magnetic fluxes generated by the currents in the three-phase windings 13 cancel each other, and the three-phase coupling inductor operates in a three-phase counter-coupling state. Because the UU-shaped magnetic core and the LL-shaped magnetic core are adopted, the magnetic core does not have a central column, and therefore the magnetic columns 11 for adjusting leakage magnetic flux do not exist on leakage magnetic flux paths between the first phase and the second phase and between the second phase and the third phase, the minimum leakage inductance can be obtained, and the coupling between the phases is strongest.

As shown in fig. 11 to 14a, in an embodiment of the multi-phase coupling inductor 100 of the present invention, the core unit 101 includes U-shaped cores 1011 and I-shaped cores 1013, the two U-shaped splices have two magnetic columns 11 arranged in parallel to form a splice 10, and an I-shaped core 1013 is disposed between two adjacent U-shaped cores 1011 in the length direction of the multi-phase coupling inductor 100 to connect the two adjacent U-shaped cores 1011.

It can be understood that, two U-shaped magnetic columns 11 are spliced to form a splicing block 10, in the length direction of the multi-phase coupling inductor 100, an I-shaped magnetic core 1013 is arranged between two adjacent U-shaped magnetic cores 1011 to connect the two adjacent U-shaped magnetic cores 1011, so as to splice and form the multi-phase coupling inductor 100, the multi-phase coupling inductor 100 works in a counter-coupling state, current ripples in the inductor can be reduced, the reduction of the current ripples of the inductor can reduce the switching loss of a switching device, and the number of assembling air gaps can be reduced, and the degree of imbalance between phases is reduced due to the reduction of the assembling air gaps.

Specifically, as shown in fig. 11 and 12a, the first splicing scenario: two pairs of UU-shaped magnetic cores and one pair of II-shaped magnetic cores are arranged in a staggered mode and spliced and assembled to form the four-phase coupling inductor. The winding 13 is composed of a first phase winding 13, a second phase winding 13, a third phase winding 13, and a fourth phase winding 13. The four-phase winding 13 is respectively arranged on two side columns of the two pairs of UU-shaped magnetic cores to form a four-phase coupling inductor. The magnetic fluxes generated by the currents in the four-phase windings 13 cancel each other, and the four-phase coupling inductor operates in a four-phase counter-coupled state. Generally, an assembly air gap exists between the magnetic cores due to splicing, the problem of unbalanced coupling between multiple phases is influenced by the existence of the assembly air gap, and the splicing mode of the UU-shaped magnetic core and the II-shaped magnetic core is adopted in the embodiment. Compared with a four-phase inductor formed by splicing and assembling four single-phase inductors, the four-phase inductor is formed by assembling two-phase coupling inductors and a pair of 'II' -shaped magnetic cores, the number of assembling air gaps can be reduced, and the unbalance degree between phases is weakened due to the reduction of the assembling air gaps.

In the present embodiment, when the current in the four-phase winding 13 flows in the direction shown in fig. 12b, the magnetic fluxes generated by the current in the four-phase winding 13 cancel each other out, the four-phase coupling inductor operates in the four-phase counter-coupling state, and any two-phase coupling inductor has the counter-coupling characteristic.

As shown in fig. 13 and 14a, the second assembly condition: three pairs of UU-shaped magnetic cores and two pairs of II-shaped magnetic cores are arranged in a staggered mode and spliced and assembled to form the six-phase coupling inductor. The windings 13 are composed of a first phase winding 13, a second phase winding 13, a third phase winding 13, a fourth phase winding 13, a fifth phase winding 13 and a sixth phase winding 13. The six-phase winding 13 is respectively arranged on two side columns of the three pairs of UU-shaped magnetic cores to form six-phase coupling inductance. The magnetic fluxes generated by the currents in the six-phase winding 13 cancel each other, and the six-phase coupling inductor operates in a six-phase counter-coupled state. With adopting six single-phase inductance concatenation equipment to form, the concatenation mode of "UU" type magnetic core and "II" type magnetic core that uses in this embodiment can reduce the quantity of equipment air gap. In the embodiment, the three two-phase coupling inductors and the two pairs of II-shaped magnetic cores are assembled, so that the assembly air gap is reduced, and the unbalance degree between the phases is weakened.

In the present embodiment, when the current in the five-phase winding 13 flows in the direction shown in fig. 14b, the magnetic fluxes generated by the current in the five-phase winding 13 cancel each other out, the five-phase coupling inductor operates in five opposite coupling states, and any two-phase coupling inductors have a decoupling characteristic.

Further, the same method is adopted, N is defined as a positive integer greater than or equal to 1, N pairs of "UU" type magnetic cores and N-1 pairs of "II" type magnetic cores can be arranged in a staggered manner and assembled in a splicing manner, 2N windings 13 are arranged on 2N side columns of the N pairs of "UU" type magnetic cores to form 2N-phase coupling inductance, and when magnetic fluxes generated by currents in the 2N-phase windings 13 are mutually offset, the 2N-phase coupling inductance works in a 2N opposite coupling state; because the N two-phase coupling inductors and the N-1 pairs of 'II' magnetic cores are assembled, compared with the prior art, the number of assembling air gaps is reduced, and meanwhile, the multiple phases are symmetrically arranged, and the balance among the multiple phases is effectively improved.

It should be noted that the U-shaped core 1011 can be 2, 4, 6, 8, etc., that is, the U-shaped core 1011 is 2N, and the I-shaped core 1013 can be 2, 4, 6, 8, etc., that is, the I-shaped core 1013 is 2N, where the number of the U-shaped core 1011 and the I-shaped core 1013 is not limited, and those skilled in the art can set the number according to actual requirements.

As shown in fig. 17 and fig. 18a, in an embodiment of the polyphase coupled inductor 100 of the present invention, the core unit 101 includes a U-shaped core 1011, an I-shaped core 1013, and an L-shaped core 1012, two U-shaped splices have two magnetic columns 11 to form a splice block 10, two L-shaped cores 1012 splice have one magnetic column 11 to form another splice block 10, an I-shaped core 1013 is disposed between two adjacent U-shaped cores 1011 in the length direction of the polyphase coupled inductor 100, and the L-shaped core 1012 is located at the head end or the tail end of several U-shaped cores 1011 arranged along the length direction of the polyphase coupled inductor 100.

In this embodiment, two U-shaped cores 11 are spliced to form a splice 10, two L-shaped cores 1012 are spliced to form a splice 11, and another splice 10 is formed, in the length direction of the multi-phase coupling inductor 100, an I-shaped core 1013 is disposed between two adjacent U-shaped cores 1011, and the L-shaped core 1012 is located at the head end or the tail end of the U-shaped cores 1011 arranged along the length direction of the multi-phase coupling inductor 100, so as to splice the multi-phase coupling inductor 100, and the multi-phase coupling inductor 100 operates in a reverse coupling state, so as to reduce current ripples in the inductor, and the reduction of the ripple current of the inductor can reduce the switching loss of the switching device, and can reduce the number of assembly air gaps, and as the assembly air gaps are reduced, the degree of imbalance between phases is reduced.

Specifically, the five-phase coupling inductor is formed by splicing and assembling two pairs of UU-shaped magnetic cores, one pair of II-shaped magnetic cores and one pair of LL-shaped magnetic cores in a staggered mode. The winding 13 is composed of a first phase winding 13, a second phase winding 13, a third phase winding 13, a fourth phase winding 13, and a fifth phase winding 13. The five-phase winding 13 is respectively arranged on two side columns of the two pairs of UU-shaped magnetic cores and on side columns of the one pair of LL-shaped magnetic cores to form five-phase coupling inductance. The magnetic fluxes generated by the currents in the five-phase windings 13 cancel each other, and the five-phase coupling inductor operates in five opposite coupling states. Compared with a four-phase inductor formed by splicing and assembling five single-phase inductors, the four-phase inductor is formed by assembling two-phase coupling inductors, a pair of II-shaped magnetic cores and a pair of LL-shaped magnetic cores, the assembling air gap is reduced, and the unbalance degree between the phases is weakened.

Further, M is defined as a positive integer greater than or equal to 2, and M pairs of UU-shaped magnetic cores, M-1 pairs of II-shaped magnetic cores and a pair of LL-shaped magnetic cores can be arranged in a staggered mode and spliced and assembled. M +1 windings 13 are arranged on M side columns of the M pairs of UU-shaped magnetic cores and the side columns of the M pairs of LL-shaped magnetic cores to form M +1 phase coupling inductors, and when magnetic fluxes generated by currents in the M +1 phase windings 13 are mutually offset, the M +1 phase coupling inductors work in an M +1 opposite coupling state. The inductor is formed by assembling M two-phase coupling inductors, M-1 pairs of 'II' magnetic cores and a pair of 'LL' magnetic cores, so that the number of assembled air gaps is reduced, and the balance among multiple phases is effectively improved.

It should be noted that the number of the U-shaped cores 1011 may be 4, 6, 8, 10, etc., that is, the number of the U-shaped cores 1011 is 2M, the number of the I-shaped cores 1013 is 2, 4, 6, 8, etc., that is, the number of the I-shaped cores 1013 is 2M-2, and the number of the L-shaped cores 1012 is 2, where the numbers of the U-shaped cores 1011 and the I-shaped cores 1013 are not limited, and those skilled in the art may set the U-shaped cores 1011 and the I-shaped cores 1013 according to actual requirements.

In the present embodiment, when the current in the five-phase winding 13 flows in the direction shown in fig. 18b, the magnetic fluxes generated by the current in the five-phase winding 13 cancel each other out, the five-phase coupling inductor operates in five opposite coupling states, and any two-phase coupling inductors have a decoupling characteristic.

As shown in fig. 1 and fig. 3a, in an embodiment of the multiphase coupled inductor 100 of the present invention, the plurality of tiles 10 may include: the pair of E-shaped magnetic cores 1015 and the pair of F-shaped magnetic cores 1016 are spliced to form a first splicing block, the first splicing block is provided with two magnetic columns 11 and a decoupling magnetic column 30 which are arranged in parallel, the decoupling magnetic column 30 is arranged between the two adjacent magnetic columns 11, the pair of F-shaped magnetic cores 1016 are spliced to form a second splicing block, the second splicing block is provided with one magnetic column 11 and one decoupling magnetic column 30, and the decoupling magnetic column 30 is used for adjusting the leakage flux between the two adjacent phase coupling inductors.

In this embodiment, the first splicing block may be the first type splicing block 15 of the foregoing embodiment, and the second splicing block may be the second type splicing block 17 of the foregoing embodiment.

Understandably, two magnetic columns 11 and a decoupling magnetic column 30 which are arranged in parallel are spliced through two E-shaped magnetic cores 1015, the decoupling magnetic column 30 is arranged between two adjacent magnetic columns 11 to form a first splicing block, two F-shaped magnetic cores 1016 are spliced to form a magnetic column 11 and a decoupling magnetic column 30 to form a second splicing block, the decoupling magnetic column 30 is used for adjusting leakage flux between two adjacent phase coupling inductors, and the splicing block forms a multiphase coupling inductor 100, so that the multiphase coupling inductor 100 works in a reverse coupling state, current ripples in the inductor can be reduced, and the reduction of the inductance ripple current can reduce the switching loss of a switching device.

Specifically, the winding 13 is composed of a first phase winding 13, a second phase winding 13, and a third phase winding 13. The three-phase coupling inductor can be formed by splicing a pair of EE type magnetic cores and a pair of FF type magnetic cores. Air gaps are arranged on two side columns of the EE type magnetic core and the side column of the FF type magnetic core. The center pillar of the "EE" type magnetic core and the center pillar of the "FF" type magnetic core are provided with air gaps. An assembly air gap is generated between the EE type magnetic core and the FF type magnetic core due to splicing assembly. The first phase winding 13 is wound around the first leg of the "EE" core. A second phase winding 13 is wound around a second leg of the "EE" core. The third phase winding 13 is wound around the leg of the "FF" core. The magnetic fluxes generated by the currents in the three-phase windings 13 cancel each other, and the three-phase coupling inductor operates in a three-phase counter-coupled state. Part of the main flux of the first phase winding 13 passes through the second phase winding 13 and is coupled to the second phase winding 13. Part of the main flux of the first phase winding 13 passes through the third phase winding 13 and is coupled to the third phase winding 13. Part of the main flux of the second phase winding 13 passes through the third phase winding 13 and is coupled with the third phase winding 13. That is, the magnetic flux is the mutual magnetic flux between the first phase winding 13 and the second phase winding 13, the magnetic flux is the mutual magnetic flux between the first phase winding 13 and the third phase winding 13, and the magnetic flux is the mutual magnetic flux between the second phase winding 13 and the third phase winding 13.

As shown in fig. 8 to 10a, in an embodiment of the multiphase coupled inductor 100 of the present invention, the plurality of tiles 10 include: two pairs of E type magnetic cores 1015 and a pair of T type magnetic core 1014, two pairs of E type magnetic cores 1015 splice respectively and form two first concatenation pieces, and first concatenation piece has two magnetic columns 11 and a decoupling zero magnetic column 30 that set up side by side, and decoupling zero magnetic column 30 sets up between two adjacent magnetic columns 11, and two T type magnetic cores 1014 splice and form the third concatenation piece, and the third concatenation piece has a decoupling zero magnetic column 30, and in the length direction of heterogeneous coupling inductance 100, be equipped with a third concatenation piece between two adjacent first concatenation pieces.

It can be understood that the pair of T-shaped magnetic cores 1014 can be spliced to form the decoupling magnetic post 30, or can be spliced to form the magnetic post 11, and those skilled in the art can set the decoupling magnetic post according to actual requirements. In this embodiment, two E-shaped magnetic cores 1015 are spliced to form two magnetic columns 11 and a decoupling magnetic column 30 which are arranged in parallel, the decoupling magnetic column 30 is arranged between two adjacent magnetic columns 11 to form a first splicing block, the two T-shaped magnetic cores 1014 are spliced to form a third splicing block, in the length direction of the multiphase coupling inductor 100, a T-shaped magnetic core 1014 is arranged between two adjacent E-shaped magnetic cores 1015 to connect the two adjacent E-shaped magnetic cores 1015, so that the multiphase coupling inductor 100 is formed by splicing, the multiphase coupling inductor 100 works in a counter-coupling state, current ripples in the inductor can be reduced, the reduction of the current of the inductor ripples can reduce the switching loss of a switching device, the number of assembling air gaps can be reduced, and the degree of imbalance between phases is reduced due to the reduction of the assembling air gaps.

Specifically, as shown in fig. 8 and 9a, the first splicing scenario: the four-phase coupling inductor is formed by splicing and assembling two pairs of EE-type magnetic cores and one pair of TT-type magnetic cores in a staggered mode. The winding 13 is composed of a first phase winding 13, a second phase winding 13, a third phase winding 13, and a fourth phase winding 13. The four-phase winding 13 is respectively arranged on four side columns of the two pairs of EE-shaped magnetic cores to form a four-phase coupling inductor. The magnetic fluxes generated by the currents in the four-phase windings 13 cancel each other, and the four-phase coupling inductor operates in a four-phase counter-coupled state. The magnetic core in this embodiment is formed by two pairs of "EE" magnetic cores and a pair of "TT" magnetic cores concatenation equipment, has the equipment air gap because of the concatenation between the magnetic core, and the existence of equipment air gap influences the inhomogeneous problem of coupling between the polyphase. The "EE" type core and the "TT" type core are spliced together in this embodiment. Compared with a four-phase inductor formed by splicing and assembling four single-phase inductors, the number of assembled air gaps can be reduced. The two-phase coupling inductors and the TT magnetic core are assembled to form the three-phase coupling inductor, the assembling air gap is reduced, and the unbalance degree between the two phases is weakened.

In the present embodiment, when the current in the four-phase winding 13 flows in the direction shown in fig. 9b, the magnetic fluxes generated by the current in the four-phase winding 13 cancel each other, and the four-phase coupling inductor operates in the four-phase counter-coupled state.

As shown in fig. 10a and 10b, the second assembly condition: the six-phase coupling inductor is formed by splicing and assembling three pairs of EE-shaped magnetic cores and two pairs of TT-shaped magnetic cores in a staggered mode. The windings 13 are composed of a first phase winding 13, a second phase winding 13, a third phase winding 13, a fourth phase winding 13, a fifth phase winding 13 and a sixth phase winding 13. The six-phase windings 13 are respectively arranged on six side columns of the three pairs of EE-shaped magnetic cores to form six-phase coupling inductors. The magnetic fluxes generated by the currents in the six-phase winding 13 cancel each other, and the six-phase coupling inductor operates in a six-phase counter-coupled state. The magnetic core in this embodiment is formed by three pairs of "EE" magnetic cores and two pairs of "TT" magnetic cores concatenation equipment, has the equipment air gap because of the concatenation between the magnetic core, and the existence of equipment air gap influences the uneven problem of coupling between the heterogeneous. Compared with the splicing and assembling of six single-phase inductors, the splicing mode of the EE-type magnetic core and the TT-type magnetic core used in the embodiment can reduce the number of assembling air gaps. In the embodiment, three two-phase coupling inductors and two pairs of TT magnetic cores are assembled, so that the assembly air gap is reduced, and the unbalance degree between phases is weakened.

In the present embodiment, when the current in the six-phase winding 13 flows in the direction shown in fig. 10c, the magnetic fluxes generated by the current in the six-phase winding 13 cancel each other, and the six-phase coupled inductor operates in the six-phase counter-coupled state.

Furthermore, M is a positive integer greater than or equal to 2, and may be formed by arranging M pairs of "EE" type magnetic cores and M-1 pairs of "TT" type magnetic cores in a staggered manner, and splicing and assembling, where M windings 13 are arranged on M side columns of the M pairs of "EE" type magnetic cores to form M-phase coupling inductance, and when magnetic fluxes generated by currents in the M-phase windings 13 cancel each other, the M-phase coupling inductance works in an M-phase opposite coupling state. Because the multi-phase transformer is assembled by M two-phase coupling inductors and M-1 pairs of TT magnetic cores, compared with the prior art, the number of assembling air gaps is reduced, and meanwhile, the multiple phases are symmetrically arranged, and the balance among the multiple phases is effectively improved.

It should be noted that the E-shaped cores 1015 may be 4, 6, 8, 10, etc., that is, the E-shaped cores 1015 are 2M, the T-shaped cores 1014 are 2, 4, 6, 8, etc., that is, the T-shaped cores 1014 are 2M-2, the number of the E-shaped cores 1015 and the T-shaped cores 1014 is not limited herein, and those skilled in the art can set the number according to actual requirements.

As shown in fig. 19 and fig. 20a, in an embodiment of the multiphase coupled inductor 100 of the present invention, the plurality of tiles 10 include: two pairs of E-shaped magnetic cores 1015, a pair of T-shaped magnetic cores 1014 and a pair of F-shaped magnetic cores 1016, wherein the pair of E-shaped magnetic cores 1015 are spliced to form a first splicing block, the first splicing block is provided with two magnetic columns 11 and a decoupling magnetic column 30 which are arranged in parallel, the decoupling magnetic column 30 is arranged between the two adjacent magnetic columns 11, the pair of F-shaped magnetic cores 1016 are spliced to form a second splicing block, the second splicing block is provided with a magnetic column 11 and a decoupling magnetic column 30, the pair of T-shaped magnetic cores 1014 are spliced to form a third splicing block, the third splicing block is provided with a decoupling magnetic column 30, in the length direction of the multi-phase coupling inductor 100, a third splicing block is arranged between the two adjacent first splicing blocks, and the second splicing block is positioned at the head end or the tail end of the multi-phase coupling inductor 100 in the length direction.

It can be understood that, by arranging a T-shaped magnetic core 1014 between two adjacent E-shaped magnetic cores 1015, the f-shaped magnetic core 1016 is located at the head end or the tail end of the E-shaped magnetic cores 1015 arranged along the length direction of the multi-phase coupling inductor 100, the decoupling magnetic column 30 is used for adjusting the leakage magnetic flux between two adjacent phase coupling inductors, so as to form the multi-phase coupling inductor 100 by splicing, the multi-phase coupling inductor 100 works in a counter-coupling state, the current ripple in the inductor can be reduced, the reduction of the inductor ripple current can reduce the switching loss of the switching device, and can reduce the number of assembling air gaps, and the degree of imbalance between phases is reduced due to the reduction of the assembling air gaps.

Specifically, two pairs of EE type magnetic cores, one pair of TT type magnetic cores and one pair of FF type magnetic cores are arranged in a staggered mode and spliced and assembled to form the five-phase coupling inductor. The winding 13 is composed of a first phase winding 13, a second phase winding 13, a third phase winding 13, a fourth phase winding 13 and a fifth phase winding 13. The five-phase winding 13 is respectively arranged on two side columns of the two pairs of EE-shaped magnetic cores and on side columns of the pair of FF-shaped magnetic cores to form five-phase coupling inductance. The magnetic fluxes generated by the currents in the five-phase windings 13 cancel each other, and the five-phase coupling inductor operates in five opposite coupling states. An assembly air gap exists between the magnetic cores due to splicing, and the unbalanced coupling problem among multiple phases is influenced by the existence of the assembly air gap. The splicing manner of the "EE" type core, the "TT" type core and the "FF" type core used in the present embodiment can reduce the number of assembled air gaps compared with the prior art, because of the prior art. In the embodiment, the two-phase coupling inductors, the pair of TT magnetic cores and the pair of FF magnetic cores are assembled, so that the assembly air gap is reduced, and the unbalance degree between phases is weakened.

Further, M is a positive integer greater than or equal to 2, and M pairs of EE type magnetic cores, M-1 pairs of TT type magnetic cores and a pair of FF type magnetic cores can be arranged in a staggered mode and spliced and assembled. The M +1 windings 13 are arranged on the M side columns of the M pairs of EE type magnetic cores and the side columns of the M pairs of FF type magnetic cores to form M +1 phase coupling inductance, and when magnetic fluxes generated by currents in the M +1 phase windings 13 are mutually offset, the M +1 phase coupling inductance works in an M +1 opposite coupling state. As the multi-phase transformer is assembled by M two-phase coupling inductors, M-1 pairs of TT magnetic cores and a pair of FF magnetic cores, compared with the prior art, the number of assembled air gaps is reduced, and the balance among multiple phases is effectively improved.

It should be noted that the E-shaped magnetic cores 1015 may be 4, 6, 8, 10, etc., that is, the U-shaped magnetic cores 1011 are 2M, and the T-shaped magnetic cores 1014 are 2, 4, 6, 8, etc., that is, the T-shaped magnetic cores 1014 are 2M-2, where the numbers of the E-shaped magnetic cores 1015 and the T-shaped magnetic cores 1014 are not limited, and can be set by those skilled in the art according to actual requirements.

In the present embodiment, when the current in the five-phase winding 13 flows in the direction shown in fig. 20b, the magnetic fluxes generated by the current in the five-phase winding 13 cancel each other out, the five-phase coupling inductor operates in five opposite coupling states, and any two-phase coupling inductors have a decoupling characteristic.

As shown in fig. 15 and fig. 16a, in an embodiment of the multiphase coupling inductor 100 of the present invention, the magnetic core unit 101 includes a U-shaped magnetic core 1011 and a T-shaped magnetic core 1014, the two U-shaped splices have two magnetic columns 11 arranged in parallel to form a splice block 10, the two T-shaped magnetic cores 1014 are spliced to form a decoupling magnetic column 30, a T-shaped magnetic core 1014 is arranged between two adjacent U-shaped magnetic cores 1011 in the length direction of the multiphase coupling inductor 100 to connect the two U-shaped magnetic cores 1011, and the decoupling magnetic column 30 is used for adjusting leakage flux between the two adjacent magnetic cores.

It can be understood that two U-shaped splices have two magnetic columns 11 arranged in parallel to form a splice block 10, two T-shaped magnetic cores 1014 are spliced to form a decoupling magnetic column 30, in the length direction of the multi-phase coupling inductor 100, a T-shaped magnetic core 1014 is arranged between two adjacent U-shaped magnetic cores 1011 to connect the two U-shaped magnetic cores 1011, the decoupling magnetic column 30 is used for adjusting the leakage flux between two adjacent phase coupling inductors, thereby splicing to form the multi-phase coupling inductor 100, the multi-phase coupling inductor 100 works in a counter-coupling state, which can reduce the current ripple in the inductor, the reduction of the inductor ripple current can reduce the switching loss of the switching device, and can reduce the number of assembled air gaps, and the degree of imbalance between phases is reduced due to the reduction of the assembled air gaps.

Specifically, the five-phase coupling inductor is formed by arranging two pairs of UU-shaped magnetic cores and one pair of TT-shaped magnetic cores in a staggered mode, and splicing and assembling the two pairs of UU-shaped magnetic cores and the TT-shaped magnetic cores. The winding 13 is composed of a first phase winding 13, a second phase winding 13, a third phase winding 13, a fourth phase winding 13 and a fifth phase winding 13. The five-phase winding 13 is respectively arranged on four side columns of the two pairs of UU-shaped magnetic cores and the center columns of the TT-shaped magnetic cores to form five-phase coupling inductance. The magnetic fluxes generated by the currents in the five-phase windings 13 cancel each other, and the five-phase coupling inductor operates in five opposite coupling states. The magnetic core in this embodiment is formed by two pairs of "UU" type magnetic cores and a pair of "TT" type magnetic cores concatenation equipment, has the equipment air gap because of the concatenation between the magnetic core, and the existence of equipment air gap influences the inhomogeneous problem of coupling between the polyphase. Compared with the splicing and assembling of five single-phase inductors, the two single-phase inductors and the TT magnetic core are assembled, the assembling air gap is reduced, and the unbalance degree between the phases is weakened.

Further, M is a positive integer greater than or equal to 2, and M pairs of UU-shaped magnetic cores and M-1 pairs of TT-shaped magnetic cores can be arranged in a staggered mode and spliced and assembled. 3M-1 windings 13 are arranged on 2M side columns of the M pairs of UU-shaped magnetic cores and the middle columns of the M-1 pairs of TT-shaped magnetic cores to form 3M-1 phase coupling inductors, and when magnetic fluxes generated by currents in the 3M-1 phase windings 13 are mutually offset, the 3M-1 phase coupling inductors work in a 3M-1 opposite coupling state. Because the multi-phase inductance transformer is assembled by M two-phase coupling inductors and M-1 pairs of TT magnetic cores, compared with the prior art, the number of assembling air gaps is reduced, and the balance among multiple phases is effectively improved.

It should be noted that the number of the U-shaped cores 1011 may be 4, 6, 8, 10, etc., that is, the number of the U-shaped cores 1011 is 2M, and the number of the T-shaped cores 1014 may be 2, 4, 6, 8, etc., that is, the number of the T-shaped cores 1014 is 2M-2, where the numbers of the E-shaped cores 1015 and the T-shaped cores 1014 are not limited, and those skilled in the art may set the cores according to actual requirements.

In this embodiment, a decoupling magnetic column 30 is arranged between two adjacent magnetic columns 11, the decoupling magnetic column 30 is used for conducting leakage magnetic flux, and the size of the leakage magnetic flux between two adjacent phases can be conveniently adjusted, namely the size of leakage inductance can be conveniently adjusted, so that the requirements of the circuit on the difference of the sizes of the leakage inductances can be met.

In the present embodiment, when the current (I) in the five-phase winding 13 is measured ₁ 、I ₂ 、I ₃ 、I ₄ 、I ₅ ) When the currents flow in the directions shown in fig. 16b, the magnetic fluxes generated by the currents in the five-phase winding 13 cancel each other out, the five-phase coupling inductor operates in five opposite coupling states, and any two-phase coupling inductor has a decoupling characteristic.

As shown in fig. 2, in an embodiment of the polyphase coupled inductor 100 of the present invention, the decoupling magnetic pillar 30 has a second air gap 30a, and the second air gap 30a is used to adjust the leakage inductance.

It can be understood that, by providing the decoupling magnetic column 30 with the second air gap 30a, the second air gap 30a is used for adjusting the magnetic permeability of the decoupling magnetic column 30, so that the magnitude of the leakage flux of the decoupling magnetic column 30, that is, the leakage inductance, can be adjusted.

In the design, the size of the second air gap 30a can be obtained according to the actually required magnitude of the leakage magnetic flux. So, can adjust the size of magnetic leakage flux according to the actual demand, also adjust the size of leakage inductance to satisfy the circuit and feel the demand of variation in size to the leakage.

The present invention further provides a multiphase interleaved DCDC converter, which includes a multiphase coupling inductor 100, and the specific structure of the multiphase coupling inductor 100 refers to the above embodiments, and since the multiphase interleaved DCDC converter adopts all technical solutions of all the above embodiments, the multiphase interleaved DCDC converter at least has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein.

As shown in fig. 21, with the dual carbon strategy landing, the development prospect of clean energy is very clear, and at the supply end, no matter photovoltaic power generation, photovoltaic roof, or wind power generation, the clean energy can not leave the energy storage and electric power storage of the battery; on the demand side, clean energy is always encouraged to be used, so the demand of power batteries is also increasing; the DCDC power supply is required to be used in the production process or the use process of the battery and is used for testing a battery cell or charging and discharging the battery. In order to further and fully rationally schedule and manage power, a bidirectional DCDC power supply is required in more and more occasions in the field. In a bidirectional low-voltage high-current DCDC power supply, the bidirectional multiphase staggered Buck-Boost topology is widely applied. The inductor in the multiphase staggered Buck-Boost topology can reduce the current ripple in the inductor on the basis of reducing the ripple current of the output capacitor if the inductor is coupled reversely, less capacitors can be used for reducing the current ripple of the output capacitor to obtain the same dynamic performance, and the reduction of the ripple current of the inductor can reduce the switching loss of a switching device. In addition, the installation space is wasted by a plurality of separated inductors, and the integrated multiphase coupling inductor 100 can save the space and reduce the installation cost.

According to the multiphase interleaved DCDC converter, the multiphase coupling inductor 100 is formed by splicing the splicing blocks, so that the problem caused by the large ratio of the length to the thickness of the multiphase coupling inductor 100 is solved; meanwhile, the coupling balance between any two phases is realized through the staggered arrangement of the windings, the performance of the coupling inductor is exerted to the maximum extent, and the problem of unbalanced stress of the switching devices corresponding to different phases is solved; the efficiency of the Buck/Buck-Boost power supply is improved, meanwhile, the utilization rate of the magnetic column 11 is high, the magnetic flux density is uniformly distributed, the loss of the magnetic column 11 is small, and the efficiency of the power supply converter can be further improved; the multiphase coupling inductor 100 can conveniently form the multiphase coupling inductors 100 of different phases according to requirements without repeated die sinking to manufacture the magnetic columns 11, and any multiphase coupling inductor 100 can be formed by modularized splicing. The multiphase coupling inductor 100 can be used in a bidirectional multiphase staggered DCDC converter, and particularly, under the application condition of low voltage and large current, the number of magnetic elements can be reduced through reasonable design, the total floor area of the magnetic elements is reduced, the size of a magnetic column 11 of the magnetic elements is reduced, the cost of the magnetic elements is reduced, and the production and installation costs are also reduced; meanwhile, the efficiency of the converter can be improved; the scheme of the invention can flexibly configure the number of phases needing coupling without the limitation of a mold.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A multi-phase coupled inductor, comprising:

2. The poly-phase coupled inductor of claim 1, wherein the plurality of tiles comprise: the magnetic pole splicing structure comprises at least one first type splicing block and at least one second type splicing block, wherein the first type splicing block is provided with two magnetic poles arranged in parallel, and the second type splicing block is provided with one magnetic pole.

3. The poly-phase coupled inductor of claim 2, wherein the plurality of tiles further comprises: the auxiliary splicing blocks are used for connecting two adjacent splicing blocks;

when the plurality of splicing blocks comprise a plurality of first-type splicing blocks, an auxiliary splicing block is arranged between every two adjacent first-type splicing blocks.

4. The poly-phase coupled inductor according to claim 2, wherein when the plurality of tiles comprises a plurality of first-type tiles and a plurality of second-type tiles, the second-type tiles are sandwiched between the first-type tiles.

5. The poly-phase coupled inductor of claim 1, wherein the plurality of tiles have three magnetic posts;

6. The multi-phase coupled inductor according to claim 5, wherein each phase of said winding comprises two winding segments, one winding segment on a first of said legs is connected in series with one winding segment on a second of said legs, another winding segment on a second of said legs is connected in series with one winding segment on a third of said legs, another winding segment on a third of said legs is connected in series with another winding segment on a first of said legs, and magnetic fluxes generated by currents in the two winding segments connected in series reinforce each other;

or, each phase of the winding comprises three winding segments;

a second winding wire section is clamped between the first winding wire section and the third winding wire section on the second magnetic column;

the first winding segment of the first magnetic column is connected with the third winding segment of the first magnetic column and the second winding segment of the second magnetic column in series, the first winding segment of the second magnetic column is connected with the third winding segment of the second magnetic column and the second winding segment of the third magnetic column in series, the first winding segment of the third magnetic column is connected with the third winding segment of the third magnetic column and the second winding segment of the first magnetic column in series, and magnetic fluxes generated by currents in the three winding segments connected in series are mutually strengthened.

7. The poly-phase coupled inductor according to claim 1, wherein the splicing block comprises two magnetic core units disposed opposite to each other, and the two magnetic core units are disposed at an interval to form a first air gap, and the first air gap is used for adjusting the permeability of the magnetic pillar.

8. The poly-phase coupled inductor of claim 7, wherein the plurality of tiles comprise: the decoupling magnetic pole is arranged between two adjacent magnetic poles, the pair of F-type magnetic cores are spliced to form a second splicing block, the second splicing block is provided with one magnetic pole and one decoupling magnetic pole, and the decoupling magnetic pole is used for adjusting the leakage flux between the two adjacent coupling inductors;

or, the plurality of tiles comprises: two pairs of E type magnetic cores, a pair of T type magnetic core and a pair of F type magnetic core, a pair of E type magnetic core concatenation forms first concatenation piece, first concatenation piece has two that set up side by side magnetic column and a decoupling zero magnetic column, the decoupling zero magnetic column sets up adjacent two between the magnetic column, a pair of F type magnetic core concatenation forms the second concatenation piece, the second concatenation piece has one magnetic column and a decoupling zero magnetic column, a pair of T type magnetic core concatenation forms the third concatenation piece, the third concatenation piece has a decoupling zero magnetic column on the length direction of heterogeneous coupling inductance, adjacent two be equipped with one between the first concatenation piece the third concatenation piece, the second concatenation piece is located the head end or the end that the length direction of heterogeneous coupling inductance was arranged.

9. The poly-phase coupled inductor of claim 8, wherein the decoupling pole has a second air gap, the second air gap being used to adjust a leakage inductance.

10. A multiphase interleaved DCDC converter comprising a multiphase coupled inductor according to any of claims 1 to 9.