CN117292923A - Magnetic element integrating coupling inductance and transformer - Google Patents

Abstract

The invention provides a magnetic element integrating a coupling inductor and a transformer, which comprises an upper magnetic core and a lower magnetic core which are mutually matched, wherein the lower magnetic core comprises a magnetic cover, M coupling inductor magnetic columns, N transformer magnetic columns and Q side columns, wherein M, N and Q are integers which are larger than or equal to 1, the coupling inductor magnetic columns are used for winding coupling inductor windings, the transformer magnetic columns are used for winding primary windings and secondary windings of the transformer, the M coupling inductor magnetic columns and the N transformer magnetic columns are arranged on the magnetic cover in parallel, and the Q side columns are arranged on the magnetic cover. Therefore, the magnetic element of the integrated coupling inductor and the transformer is adopted, the volume and the weight of the magnetic element can be reduced, the efficiency and the power density of the converter are improved, and the cost of the converter is reduced.

Description

Magnetic element integrating coupling inductance and transformer

Technical Field

The invention relates to the technical field of electronic elements, in particular to a magnetic element integrating a coupling inductor and a transformer.

Background

In recent years, with the development of new energy industry, it is very important to improve the efficiency and power density of the charging pile. Discrete inductors, transformers occupy large volumes, weights and losses, and are complex to wire and costly.

In the related art, the inductor and the transformer are integrated in one magnetic core by adopting a magnetic integration technology, so that the volume and the loss of the whole magnetic element are reduced, the efficiency and the power density of the converter are improved, but the effect is insufficient, and therefore, the magnetic integration technology still has room for further improvement.

Disclosure of Invention

The invention provides the following technical scheme for solving one of the technical problems.

The embodiment of the first aspect of the invention provides a magnetic element integrating a coupling inductor and a transformer, which comprises an upper magnetic core and a lower magnetic core which are mutually matched, wherein the lower magnetic core comprises a magnetic cover, M coupling inductor magnetic columns, N transformer magnetic columns and Q side columns, wherein M, N and Q are integers which are more than or equal to 1, the coupling inductor magnetic columns are used for winding coupling inductor windings, the transformer magnetic columns are used for winding primary side windings and secondary side windings of the transformer, the M coupling inductor magnetic columns and the N transformer magnetic columns are arranged on the magnetic cover in parallel, and the Q side columns are arranged on the magnetic cover.

In addition, the magnetic element of the integrated coupling inductor and transformer according to the above embodiment of the present invention may have the following additional technical features.

According to one embodiment of the invention, the upper core is identical in structure and symmetrically arranged to the lower core.

According to one embodiment of the invention, the upper core is structurally different from the lower core.

According to one embodiment of the invention, the upper core comprises a magnetic cover.

According to one embodiment of the invention, an air gap is formed between the coupling inductance magnetic pole and the transformer magnetic pole.

According to one embodiment of the invention, a 2X-turn coupling inductance winding is integrally wound on M coupling inductance magnetic poles, a Y-turn transformer primary winding and a Z-turn transformer secondary winding are integrally wound on N transformer magnetic poles, wherein X, Y and Z are integers greater than or equal to 1, and winding directions of the coupling inductance winding and the transformer primary winding are the same or opposite.

According to one embodiment of the invention, when the number of turns of the coupling inductance winding and the primary winding of the transformer are the same, one set of windings is integrally wound on the M coupling inductance magnetic columns and the N transformer magnetic columns; when the number of turns of the coupling inductance winding is smaller than that of the primary winding of the transformer, one set of 2X-turn winding is integrally wound on M coupling inductance magnetic columns and N transformer magnetic columns, and the other set of Y-2X-turn winding is integrally wound on N transformer magnetic columns; when the number of turns of the coupling inductance winding is larger than that of the primary winding of the transformer, one set of Y-turn winding is integrally wound on M coupling inductance magnetic columns and N transformer magnetic columns, and the other set of 2X-Y-turn winding is integrally wound on M coupling inductance magnetic columns.

According to one embodiment of the invention, the M coupling inductance magnetic columns and the N transformer magnetic columns are combined into a group, and the number of the groups is three, and the three groups are respectively used as an A phase coupling inductance and a transformer, a B phase coupling inductance and a transformer and a C phase coupling inductance and a transformer.

According to one embodiment of the invention, the a-phase coupled inductor and transformer, the B-phase coupled inductor and transformer, and the C-phase coupled inductor and transformer are arranged in a transverse, longitudinal or delta-like arrangement.

According to one embodiment of the invention, Q of the legs are disposed around or in the middle of the a-phase coupled inductor and transformer, the B-phase coupled inductor and transformer, and the C-phase coupled inductor and transformer.

According to the technical scheme, the magnetic element of the transformer and the coupling inductor are integrated, so that the size and weight of the magnetic element can be reduced, the efficiency and the power density of the transformer are improved, and the cost of the transformer is reduced.

Drawings

Fig. 1 is a cross-sectional view of a lower core of a magnetic element of an integrated coupled inductor and transformer in accordance with an embodiment of the present invention.

Fig. 2A is a schematic diagram of a magnetic component of an integrated coupled inductor and transformer according to an embodiment of the present invention.

Fig. 2B is a schematic diagram of a magnetic component of an integrated coupling inductor and transformer according to another embodiment of the present invention.

Fig. 3A is a schematic diagram of winding windings of a 2X turn coupled inductor winding and a Y turn transformer primary winding in the same direction according to an embodiment of the present invention.

Fig. 3B is a schematic diagram of winding reverse to the primary winding of a 2X turn coupled inductor winding and a Y turn transformer in accordance with one embodiment of the present invention.

Fig. 4 is a schematic diagram of winding windings when the number of turns of the coupled inductor winding and the primary winding of the transformer is the same in an example of the present invention.

Fig. 5A is a cross-sectional view of a lower core of three-phase integration by laterally expanding the core in accordance with one embodiment of the present invention.

Fig. 5B is a cross-sectional view of a lower core of an embodiment of the present invention with three-phase integration by longitudinally expanding the core.

Fig. 5C is a cross-sectional view of a lower core of a three-phase integration by a delta-shaped expanded core in accordance with one embodiment of the present invention.

Fig. 6 is a schematic structural view of a single-phase magnetic element according to a first embodiment of the present invention.

Fig. 7 is a schematic structural view of a single-phase magnetic element according to a second embodiment of the present invention.

Fig. 8 is a schematic structural view of a single-phase magnetic element according to a third embodiment of the present invention.

Fig. 9 is a schematic structural view of the three-phase magnetic element obtained by the lateral expansion of fig. 6.

Fig. 10 is a schematic structural view of the three-phase magnetic element obtained by longitudinal expansion of fig. 6.

Reference numerals: 1. a lower magnetic core; 2. a top magnetic core; 11. a magnetic cover; 12. coupling an inductance magnetic column; 13. a transformer magnetic pole; 14. a side column; 15. coupling an inductance winding; 16. primary winding of transformer; 17. a secondary winding of the transformer; 15 a.a. phase coupled inductor winding; 16a. Primary winding of a phase transformer; 17 a.a. phase transformer secondary winding; 15 b.b. phase coupled inductor winding; 16b. primary winding of phase b transformer; 17 b.b. secondary winding of phase transformer; 15 c.c. phase coupled inductor winding; 16 c.c. primary winding of phase transformer; 17 c.c. phase transformer secondary winding.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Aiming at the problems of larger volume, larger loss and higher cost in the related technology, the embodiment of the invention adopts the magnetic integration technology, so that the coupling inductance and the transformer can be integrated in one magnetic core, the number of turns and the winding direction of the winding can be flexibly adjusted, the magnetic density distribution is optimized, the winding loss and the magnetic core loss are further reduced, the volume and the weight are reduced, the cost is reduced, and the efficiency and the power density of the converter are further improved.

Fig. 1 is a cross-sectional view of a lower core of a magnetic element of an integrated coupled inductor and transformer in accordance with an embodiment of the present invention.

Fig. 2A is a schematic diagram of a magnetic component of an integrated coupled inductor and transformer according to an embodiment of the present invention.

Fig. 2B is a schematic diagram of a magnetic component of an integrated coupling inductor and transformer according to another embodiment of the present invention.

As shown in fig. 1, 2A and 2B, the magnetic element of the integrated coupling inductor and the transformer includes an upper magnetic core 2 and a lower magnetic core 1 which are mutually matched, the lower magnetic core 1 includes a magnetic cover 11, M coupling inductor magnetic columns 12, N transformer magnetic columns 13 and Q side columns 14, wherein M, N and Q are integers greater than or equal to 1, the coupling inductor magnetic columns 12 are used for winding coupling inductor windings, the transformer magnetic columns 13 are used for winding primary windings and secondary windings of the transformer, the M coupling inductor magnetic columns 12 and the N transformer magnetic columns 13 are arranged on the magnetic cover 11 in parallel, and the Q side columns 14 are arranged on the magnetic cover 11.

The coupling inductance magnetic pole 12 and the transformer magnetic pole 13 may be disposed on the magnetic cover 11, and then Q side poles 14 may be disposed at other positions of the magnetic cover 11. For example, Q side posts 14 are disposed around the whole of the M coupling inductance magnetic posts 12 and the N transformer magnetic posts 13, that is, Q side posts 14 fully enclose or partially enclose the M coupling inductance magnetic posts 12 and the N transformer magnetic posts 13, referring to fig. 1, the side posts 14 are used for providing a freewheel path; or other locations, such as the middle, the periphery, etc., of the M coupled inductor studs 12 and the N transformer studs, as long as they do not conflict with the stud locations, the side studs 14 are used to provide a freewheel path. Referring to fig. 2A and 2B, the number of side posts may be two, and one side post 14 is symmetrically disposed on each of left and right sides or front and rear sides of the whole magnetic posts, that is, one end and the other end of the magnetic cover 11 in the front-rear direction or the left-right direction.

Referring to fig. 1, 2A and 2b, m coupling inductor magnetic columns 12 are arranged in one column (equally spaced or unequally spaced), N transformer magnetic columns 13 are arranged in another column (equally spaced or unequally spaced) on the surface of the magnetic cover 11, and may have a matrix structure.

The cross sections of the magnetic columns and the side columns can be round, square or polygonal. The shape of the magnetic cover 11 may be various shapes such as a square body and a column body.

Specifically, the coupling inductance magnetic columns 12 are wound with a plurality of turns of coupling inductance windings, the transformer magnetic columns 13 are wound with a plurality of turns of transformer primary windings and transformer secondary windings, the lower magnetic core 1 and the upper magnetic core 2 are mutually matched and arranged (upper and lower covers) to obtain a magnetic element of the integrated coupling inductance and transformer, wherein M coupling inductance magnetic columns 12 and N transformer magnetic columns 13 are used as a group of coupling inductances and transformers, and when the magnetic element is provided with a group of coupling inductances and transformers, the magnetic element is a single-phase magnetic element; when the magnetic element has three sets of coupled inductors and transformers, the magnetic element is a three-phase magnetic element, wherein two sets of coupled inductors and transformers are extended by one set of coupled inductors and transformers.

If M or N or Q is larger than 1, the eddy current effect of magnetic flux can be weakened, the utilization rate of the magnetic conduction area of the magnetic column can be improved, and the magnetic core loss can be reduced.

In the converter circuit topology of the embodiment of the invention, the coupling inductor is connected with the transformer.

Compared with the related art, the embodiment of the invention can integrate the single-phase or three-phase coupling inductor and the transformer, and has smaller volume and weight compared with the discrete coupling inductor and the transformer, thereby improving the power density of the converter. The coupling inductor and the transformer are integrated, so that the number of turns and the winding direction of the coupling inductor winding and the transformer winding are convenient to adjust, the magnetic density distribution is optimized, the winding loss and the magnetic core loss are reduced, the volume is reduced, and the cost is reduced. By flexibly adjusting the position and number of magnetic posts or side posts (i.e., M or N or Q), core losses can be further reduced.

Therefore, the magnetic element integrating the coupling inductor and the transformer is obtained by integrating the coupling inductor and the transformer, and has smaller volume, weight, lower loss and lower cost.

In one embodiment of the present invention, the upper magnetic core 2 and the lower magnetic core 1 have the same structure and are symmetrically arranged, that is, the upper magnetic core 2 and the lower magnetic core 1 have a symmetrical structure.

Specifically, referring to fig. 2A, each of the upper core 2 and the lower core 1 includes a magnetic cover 11, M coupling inductance magnetic columns 12, N transformer magnetic columns 13, and 2 side columns 14 provided on both left and right sides of the magnetic cover 1, and the magnetic columns provided on both cores have the same height and the same side column height.

Therefore, the magnetic integration can be realized through 2 identical magnetic cores, the die can be saved, and the cost is reduced.

In another embodiment of the present invention, the upper core 2 and the lower core 1 are different in structure, i.e., the upper core 2 and the lower core 1 are asymmetric in structure.

Further, the upper core 2 includes a magnetic cover.

Specifically, the structure of the upper core 2 is different from that of the lower core 1, for example, referring to fig. 2B, the upper core 2 may include only a magnetic cover, and in addition, the upper core 2 may be another structure different from that of the lower core 1, for example, the heights of the magnetic columns of the upper core 2 and the lower core 1 are different, the number and the heights of the side columns of the upper core 2 and the lower core 1 are different, and the like. The structure of the upper core 2 may be specifically determined according to practical requirements, and the embodiment of the present invention is not limited thereto.

In one embodiment of the present invention, the coupling inductor pole 12 and the transformer pole 13 are provided with an air gap, which may be a centralized air gap (see fig. 2A), or a distributed air gap (located at any position of the pole, such as the middle). The side posts 14 may be free of air gaps.

Specifically, the magnetizing inductance value of the transformer or the inductance value of the coupling inductance can be controlled by adjusting the length of the centralized air gap or the distributed air gap. The length of the air gap on the coupling inductance pole 12 and the transformer 13 is the same or different.

In one embodiment of the present invention, the 2X-turn coupling inductor winding is integrally wound around the M coupling inductor magnetic poles 12, the y-turn transformer primary winding and the Z-turn transformer secondary winding are integrally wound around the N transformer magnetic poles 13, wherein X, Y and Z are integers greater than or equal to 1, and the winding directions of the coupling inductor winding and the transformer primary winding are the same or opposite.

Wherein, the whole winding is wound on a certain object, namely, the certain object is taken as a whole magnetic column, and the winding is wound on the whole magnetic column. For example, the winding is integrally wound around the M coupling inductance magnetic poles, that is, the M coupling inductance magnetic poles as a whole, and the winding is wound around the M coupling inductance magnetic poles instead of being wound separately.

Specifically, as shown in fig. 3A, all the coupling inductance magnetic columns 12 are taken as one integral magnetic column, and the 2X-turn coupling inductance winding 15 is wound on the integral magnetic column, namely, the coupling inductance winding 15 surrounds all the coupling inductance magnetic columns 12; all transformer magnetic poles 13 are used as an integral magnetic pole, the primary winding 16 of the Y-turn transformer is wound on the integral magnetic pole, the secondary winding 17 of the Z-turn transformer is also wound on the integral magnetic pole, and the winding direction of the 2X-turn winding 15 is the same as that of the Y-turn winding 16.

As shown in fig. 3B, all the coupling inductance magnetic columns 12 are used as a whole magnetic column, and the 2X-turn coupling inductance winding 15 is wound on the whole magnetic column, namely, the coupling inductance winding 15 surrounds all the coupling inductance magnetic columns 12; all transformer magnetic poles 13 are used as an integral magnetic pole, the primary winding 16 of the Y-turn transformer is wound on the integral magnetic pole, the secondary winding 17 of the Z-turn transformer is also wound on the integral magnetic pole, and the winding directions of the 2X-turn winding 15 and the Y-turn winding 16 are opposite.

In fig. 3A and 3B, the magnetic element has 2 side posts symmetrically disposed on the upper and lower sides of the magnetic cover.

For example, the 2-turn coupling inductance winding is integrally wound on the 3 coupling inductance magnetic poles 12, the 2-turn transformer primary winding and the 2-turn transformer secondary winding are integrally wound on the 3 transformer magnetic poles, and the winding directions of the 2-turn transformer primary winding and the 2-turn coupling inductance winding are opposite.

Therefore, the magnetic flux paths can be fully optimized by introducing a plurality of magnetic columns, and when the winding directions of the coupling inductance winding and the primary winding of the transformer are opposite, magnetic fluxes can be mutually offset, so that the magnetic core loss is reduced, and the efficiency of the converter is improved.

In one example of the present invention, when the number of turns of the coupling inductance winding 15 and the primary winding 16 of the transformer are the same, one set of windings is integrally wound around the M coupling inductance magnetic poles 12 and the N transformer magnetic poles 13; when the number of turns of the coupling inductance winding 15 is smaller than that of the primary winding 16 of the transformer, one set of 2X turns of windings is integrally wound on the M coupling inductance magnetic columns 12 and the N transformer magnetic columns 13, and the other set of Y-2X (Y minus 2X) turns of windings is integrally wound on the N transformer magnetic columns 13; when the number of turns of the coupling inductance winding 15 is larger than that of the primary winding 16 of the transformer, one set of Y-turn windings is integrally wound on the M coupling inductance magnetic poles 12 and the N transformer magnetic poles 13, and the other set of 2X-Y (2X minus Y) turn windings is integrally wound on the M coupling inductance magnetic poles 12.

Wherein, the winding integrally around the M coupling inductance magnetic columns 12 and the N transformer magnetic columns 13 means that the M coupling inductance magnetic columns 12 and the N transformer magnetic columns 13 (i.e. all magnetic columns) are used as an integral magnetic column, and a set of windings is wound around the integral magnetic column.

Specifically, for a single-phase magnetic element, it is determined whether two sets of windings or three sets of windings are used, depending on the magnitude relation of 2X and Y. Each set of windings can be realized by litz wire, multi-strand enameled wire, flat wire or PCB windings, etc.

As shown in fig. 4, if 2 x=y, a set of windings may be integrally wound around all the coupling inductance pole 12 and the transformer pole 13 by 2X (or Y) turns, i.e., all the coupling inductance pole 12 and the transformer pole 13 are formed as one integral pole, and a set of windings may be wound around the integral pole to surround all the poles. Therefore, only two sets of windings are used at this time, namely, the coupling inductance winding 15 and the primary winding 16 of the transformer share one set of windings with 2X (or Y) turns, and the secondary winding of the transformer uses the other set of windings with Z turns. In fig. 4, the magnetic element has 2 side posts 14 symmetrically disposed on the upper and lower sides of the magnetic cover.

If 2X < y, a set of windings may be integrally wound around all of the coupling inductor post 12 and the transformer post 13 by 2X turns, i.e., all of the coupling inductor post 12 and the transformer post 13 are formed as a unitary post around which a set of windings is wound to surround all of the posts. And then another set of windings is wound around all of the transformer poles 12 by Y-2X turns to surround all of the transformer poles 12. Therefore, three sets of windings are used at this time, namely, the coupling inductance winding 15 and the primary winding 16 of the transformer share one set of windings with 2X turns, the primary winding 16 of the transformer also uses another set of windings with Y-2X turns, and the secondary winding of the transformer uses another set of windings with Z turns.

If 2x > Y, a set of windings may be integrally wound Y turns around all of the coupling inductor pole 12 and the transformer pole 13, i.e., all of the coupling inductor pole 12 and the transformer pole 13 are formed as a unitary pole around which a set of windings is wound to surround all of the poles. A further set of windings is wound around all coupled inductor poles 12 by 2X-Y turns to surround all coupled inductor poles 12. Therefore, three sets of windings are used at this time, namely, the coupling inductance winding 15 and the primary winding 16 of the transformer share one set of Y-turn windings, the coupling inductance winding 15 also uses another set of 2X-Y-turn windings, and the secondary winding of the transformer uses another set of Z-turn windings.

When 2 X=Y, the primary side of the transformer and the coupling inductance are all realized by one winding, and compared with other modes such as winding respectively, the winding length can be reduced by about 30%, so that the winding loss is reduced, and the efficiency of the converter is improved. When the winding length is not equal to 2X and is not equal to Y, the primary side of the transformer and the coupling inductance are realized by one winding part, and compared with other modes such as winding respectively, the winding length can be reduced by about 20%, so that the winding loss is reduced, and the efficiency of the converter is improved.

Therefore, the coupling inductance winding and the primary winding of the transformer share one set of winding, so that the winding length can be reduced, the winding loss can be reduced, and the efficiency of the converter can be improved.

The magnetic integration scheme is aimed at a single-phase magnetic element, and for a three-phase magnetic element, the M coupling inductance magnetic columns 12 and the N transformer magnetic columns 13 can be used as a group of expansion objects to be expanded, so that three groups of M coupling inductance magnetic columns 12 and N transformer magnetic columns 13 are obtained, and the three-phase magnetic element is obtained.

That is, in one embodiment of the present invention, the M coupling inductors and the N transformer magnetic poles are combined into one group, and the number of the groups of the combinations is three, which are respectively used as an a-phase coupling inductor and a transformer, a B-phase coupling inductor and a transformer, and a C-phase coupling inductor and a transformer.

Further, as shown in fig. 5A, 5B and 5C, the a-phase coupled inductor and the transformer, the B-phase coupled inductor and the transformer, and the C-phase coupled inductor and the transformer are arranged in a transverse, longitudinal or delta shape.

Specifically, in order to obtain a three-phase magnetic element, three groups of M coupling inductance magnetic columns 12 and N transformer magnetic columns 13, that is, three-phase coupling inductances and transformers, each phase coupling inductance and transformer including M coupling inductance magnetic columns and N transformer magnetic columns, may be obtained by expanding a single-phase magnetic element. For the three-phase magnetic integration expansion mode, it may be a lateral expansion as shown in fig. 5A, a longitudinal expansion as shown in fig. 5B, or a delta expansion as shown in fig. 5C. The winding mode of each phase in the three-phase magnetic integration scheme is the same as that of the single-phase magnetic integration scheme.

The positions and numbers of the Q side posts 14 may be kept unchanged during the expansion, or the number and/or positions of the Q side posts 14 may be changed according to actual requirements, for example, when the single-phase magnetic element includes two side posts 14 disposed on the left and right sides of the magnetic cover during the lateral expansion, referring to fig. 5A, the three-phase magnetic element may also include two side posts 14 disposed on the left and right sides of the magnetic cover; in the case where the longitudinal expansion is performed and the single-phase magnetic element includes two legs 14 provided at both upper and lower sides of the magnetic cover, referring to fig. 5B, the three-phase magnetic element may also include two legs 14 provided at both upper and lower sides of the magnetic cover.

In one example of the invention, Q legs 14 are disposed around or in the middle of the A-phase coupled inductor and transformer, the B-phase coupled inductor and transformer, and the C-phase coupled inductor and transformer.

Specifically, Q side posts 14 are disposed on the magnetic cover at positions other than the a-phase coupling inductor and the transformer, the B-phase coupling inductor and the transformer, and the C-phase coupling inductor and the transformer, for example, may be located at positions around all coupling inductors and transformers, that is, Q side posts surround all coupling inductors and transformers, or may be located at intermediate positions of all coupling inductors and transformers.

Further, when the a-phase coupling inductor and the transformer, the B-phase coupling inductor and the transformer, and the C-phase coupling inductor and the transformer are arranged in a delta shape, Q side posts are provided at the middle position of the magnetic cover 11.

Specifically, in the case of delta expansion, a plurality of side posts without air gaps may be placed around or in the middle of each magnetic post, and referring to fig. 5C, 1 cylindrical side post may be disposed in the middle position of the magnetic cover 11, i.e., q=1 at this time, to provide a freewheel path.

Therefore, when the three-phase magnetic element is arranged in the delta shape, 1 side column is arranged at the middle position of the delta shape, so that the space can be fully utilized, the volume of the three-phase magnetic element is reduced, the loss is reduced, and the efficiency of the converter is improved.

The structure of the embodiment of the present invention will be described below by taking a coupling inductor (having 1 coupling inductor pole) and a transformer with a center tap (having 1 transformer pole) as examples. Fig. 6 to 8 are schematic structural views of a single-phase magnetic element, and fig. 9 and 10 are schematic structural views of a three-phase magnetic element.

As shown in fig. 6, the upper core 2 and the lower core 1 are identical cores, and the 2 legs 14 provided on the left and right sides have no air gap, and the 2 legs 12 and 13 have air gaps. The number of turns (2X) of the coupled inductor winding is equal to the number of turns (Y) of the primary winding of the transformer. The winding 17 is the winding of the secondary side of the transformer, and has Z turns. Winding 15 (or 16) is a common winding coupling the inductor and the primary side of the transformer, for a total of 2X (or Y) turns.

As shown in fig. 7, the upper core 2 and the lower core 1 are identical cores, and 2 legs have no air gap and 2 legs have an air gap. The number of turns (2X) of the coupled inductor winding is greater than the number of turns (Y) of the primary winding of the transformer. The winding 17 is the winding of the secondary side of the transformer, and has Z turns. One set of windings 15 (or 16) is a common winding coupling the inductor and the primary side of the transformer, for Y turns. The other set of windings 15 is a winding of coupled inductance for a total of 2X-Y turns. The difference from fig. 6 is that the number of turns (2X) of the coupling inductor is larger than the number of turns (Y) of the primary side of the transformer, and the coupling inductor needs to be wound with 2X-Y turns of windings.

As shown in fig. 8, the upper core 2 and the lower core 1 are identical cores, and 2 legs have no air gap and 2 legs have an air gap. The number of turns (2X) of the coupled inductor winding is smaller than the number of turns (Y) of the primary winding of the transformer. The winding 17 is the winding of the secondary side of the transformer, and has Z turns. One set of windings 15 (or 16) is a common winding coupling the inductor and the primary side of the transformer for a total of 2X turns. The other set of windings 16 is the primary winding of the transformer, for Y-2X turns. The difference from fig. 6 is that the number of turns (2X) of the coupling inductance is smaller than the number of turns (Y) of the primary side of the transformer, and the winding is needed to be wound around the magnetic pole of the transformer by more than Y-2X turns.

As shown in fig. 9, the upper core 2 and the lower core 1 are identical cores, 2 legs have no air gap, and 6 legs have an air gap. The number of turns (2X) of each phase coupling inductance winding is equal to the number of turns (Y) of the primary winding of the transformer. Winding 17A is the winding on the secondary side of the a-phase transformer, for a total of Z turns. Winding 15A (or 16A) is a common winding of the a-phase coupled inductor and the primary side of the transformer for a total of 2X (or Y) turns. Winding 17B is the secondary winding of the B-phase transformer, with Z turns. Winding 15B (or 16B) is a common winding of the B-phase coupled inductor and the primary side of the transformer for a total of 2X (or Y) turns. The winding 17C is the winding of the secondary side of the C-phase transformer and has Z turns. Winding 15C (or 16C) is a common winding of the C-phase coupled inductor and the primary side of the transformer for a total of 2X (or Y) turns. The core of this embodiment is laterally expanded from the core shown in fig. 6, and wound in a similar manner to fig. 6.

As shown in fig. 10, the upper core 2 and the lower core 1 are identical cores, 2 legs have no air gap, and 6 legs have an air gap. The number of turns (2X) of the inductor windings coupled per phase is equal to the number of turns (Y) of the primary winding of the transformer. Winding 17A is the winding on the secondary side of the a-phase transformer, for a total of Z turns. Winding 15A (or 16A) is a common winding of the a-phase coupled inductor and the primary side of the transformer for a total of 2X (or Y) turns. Winding 17B is the secondary winding of the B-phase transformer, with Z turns. Winding 15B (or 16B) is a common winding of the B-phase coupled inductor and the primary side of the transformer for a total of 2X (or Y) turns. The winding 17C is the winding of the secondary side of the C-phase transformer and has Z turns. Winding 15C (or 16C) is a common winding of the C-phase coupled inductor and the primary side of the transformer for a total of 2X (or Y) turns. The difference from fig. 9 is that the core of this embodiment is expanded longitudinally from the core shown in fig. 6, and the winding is similar to that of fig. 6.

FIG. 9 corresponds to FIG. 5A, having 2 side posts disposed on the left and right sides of the magnetic cover; fig. 10 corresponds to fig. 5B, and has 2 side posts disposed on the upper and lower sides of the magnetic cover.

In summary, the embodiment of the invention not only can integrate the coupling inductor and the transformer in one magnetic core, but also can flexibly adjust the number of turns and the winding direction of the winding, optimize the magnetic density distribution, reduce the winding loss and the magnetic core loss, reduce the volume and reduce the cost; the coupling inductor and the transformer can be integrated in a single phase or three phases, and compared with a discrete magnetic element, the coupling inductor and the transformer have smaller volume and weight, and the power density of the converter is improved; can be realized through 2 identical magnetic cores, so that the die is saved, and the cost is reduced; the winding length can be reduced, the winding loss can be reduced, and the efficiency of the converter can be improved; the magnetic flux can be cancelled, so that the magnetic core loss is reduced, and the efficiency of the converter is improved.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily for the same embodiment or example. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. The utility model provides a magnetic element of integrated coupling inductance and transformer, its characterized in that, includes the upper magnetic core, the lower magnetic core that mutually support the setting, the lower magnetic core includes magnetic cover, M coupling inductance magnetic pillar, N transformer magnetic pillar and Q limit post, wherein M, N and Q are the integer that is greater than or equal to 1, coupling inductance magnetic pillar is used for winding coupling inductance winding, the transformer magnetic pillar is used for winding transformer primary winding and transformer secondary winding, M coupling inductance magnetic pillar and N the transformer magnetic pillar sets up side by side on the magnetic cover, Q the limit post sets up on the magnetic cover.

2. The magnetic component of the integrated coupled inductor and transformer of claim 1, wherein the upper core is identical in structure and symmetrically disposed to the lower core.

3. The magnetic component of the integrated coupled inductor and transformer of claim 1, wherein the upper core is structurally different from the lower core.

4. A magnetic component for integrating a coupled inductor and a transformer as recited in claim 3, wherein the upper core comprises a magnetic cover.

5. The magnetic component of the integrated coupling inductor and transformer of claim 1, wherein the coupling inductor magnetic leg and the transformer magnetic leg are provided with an air gap.

6. The magnetic component of claim 1, wherein a 2X turn coupling inductor winding is integrally wound around M coupling inductor magnetic poles, a Y turn transformer primary winding and a Z turn transformer secondary winding are integrally wound around N transformer magnetic poles, wherein X, Y and Z are integers greater than or equal to 1, and the winding directions of the coupling inductor winding and the transformer primary winding are the same or opposite.

7. The magnetic component of the integrated coupled inductor and transformer of claim 6, wherein,

when the number of turns of the coupling inductance winding is the same as that of the primary winding of the transformer, a set of windings is integrally wound on M coupling inductance magnetic columns and N transformer magnetic columns;

when the number of turns of the coupling inductance winding is smaller than that of the primary winding of the transformer, one set of 2X-turn winding is integrally wound on M coupling inductance magnetic columns and N transformer magnetic columns, and the other set of Y-2X-turn winding is integrally wound on N transformer magnetic columns;

when the number of turns of the coupling inductance winding is larger than that of the primary winding of the transformer, one set of Y-turn winding is integrally wound on M coupling inductance magnetic columns and N transformer magnetic columns, and the other set of 2X-Y-turn winding is integrally wound on M coupling inductance magnetic columns.

8. The magnetic component of integrated coupled inductor and transformer according to any one of claims 1-7, wherein M said coupled inductor magnetic poles and N said transformer magnetic poles are combined, said combined number being three groups of three as a-phase coupled inductor and transformer, B-phase coupled inductor and transformer and C-phase coupled inductor and transformer, respectively.

9. The magnetic component of claim 8, wherein the a-phase coupled inductor and transformer, the B-phase coupled inductor and transformer, and the C-phase coupled inductor and transformer are arranged in a lateral, longitudinal, or delta configuration.

10. The magnetic component of claim 9, wherein Q legs are disposed around or in-between the a-phase coupled inductor and transformer, the B-phase coupled inductor and transformer, and the C-phase coupled inductor and transformer.