Reactors and power converters

Abstract

The present application discloses a reactor and a power converter, wherein the reactor includes a core unit and a winding; wherein the core unit includes a core group, the core group includes two U-shaped cores with openings facing each other, the closed end of the U-shaped core is located outside the winding, and the closed end is adjacent to and facing one end of the winding, the two sides of the U-shaped core are located inside and outside the same winding, respectively, and the core group is used to form a closed magnetic circuit under the action of the corresponding winding. In the above reactor, the side of the U-shaped core and the winding can limit each other in the radial direction of the winding; the closed end of the U-shaped core and the winding can limit each other in the axial direction of the winding, which reduces the dimensional deviation of the winding, reduces the volume of the winding, thereby reducing the volume of the entire reactor, and improving the energy density of the reactor, so as to facilitate the improvement of the power density of the power converter.

Description

Technical Field

[0001] The present application relates to the technical field of renewable energy power generation, and more specifically, to a reactor and a power converter. Background Art

[0002] As the power density of power converters such as inverters increases, the reactors on the inverter side need to have high energy density and high heat dissipation performance to ensure that the reactors maintain stable electrical performance under high current conditions.

[0003] However, the existing reactors are usually of a U-shaped magnetic core combination structure, which is relatively large in size, resulting in limited improvement in the energy density of the reactor, hindering the improvement in the power density of the power converter.

[0004] In addition, in the U-shaped magnetic core combination structure, the winding accuracy of the winding is relatively high, and the winding of the winding relies on advanced CNC winding equipment, which leads to a high cost of the winding and also a high cost of the reactor.

[0005] In summary, how to design a reactor to reduce the volume of the reactor and increase the energy density of the reactor, thereby facilitating the improvement of the power density of the power converter, is a problem that needs to be urgently solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of the present application is to provide a reactor and a power converter to reduce the volume of the reactor and improve the energy density of the reactor, thereby facilitating the improvement of the power density of the power converter.

[0007] In order to achieve the above objectives, this application provides the following technical solutions:

[0008] A reactor comprises a magnetic core unit and a winding; wherein the magnetic core unit comprises a magnetic core group, the magnetic core group comprises two U-shaped magnetic cores with openings facing each other, the closed end of the U-shaped magnetic core is located outside the winding, and the closed end is adjacent to and opposite to one end of the winding, the two side portions of the U-shaped magnetic core are respectively located inside and outside the same winding, and the magnetic core group is used to form a closed magnetic circuit under the action of the winding corresponding to it.

[0009] Optionally, the magnetic core unit further includes an I-type magnetic core;

[0010] Wherein, in the first direction, at least one side of at least one of the magnetic core groups is distributed with the I-type magnetic core; the first direction is the direction in which the two side portions of the U-shaped magnetic core are distributed in sequence;

[0011] At least one of the windings corresponds to the I-type magnetic core, and the I-type magnetic core is used to form a magnetic circuit under the action of the corresponding winding.

[0012] Optionally, in the corresponding winding and the I-type magnetic core, the I-type magnetic core passes through the winding along the axial direction of the winding.

[0013] Optionally, in the first direction, the I-type magnetic cores are distributed on one side of at least one of the magnetic core groups.

[0014] Optionally, in the first direction, there are at least two magnetic core groups, and every two magnetic core groups form a magnetic core assembly; in each magnetic core assembly, the I-type magnetic core is distributed between the two magnetic core groups.

[0015] Optionally, in the magnetic core assembly, the winding is sleeved between two side portions of the U-shaped magnetic core.

[0016] Optionally, there are at least two magnetic core components and they are distributed in sequence along the first direction; and / or, there are at least two magnetic core components and they are distributed in sequence along a second direction, the second direction is the direction in which the two U-shaped magnetic cores in the magnetic core group are distributed in sequence, and the second direction is perpendicular to the first direction.

[0017] Optionally, in the first direction, there are at least two magnetic core groups and at least two I-type magnetic cores; wherein all the magnetic core groups are distributed between the two I-type magnetic cores.

[0018] Optionally, in the first direction, there are two magnetic core groups, and the winding is coated on the I-type magnetic core and the side adjacent to the I-type magnetic core.

[0019] Optionally, in the first direction, the I-type magnetic cores are distributed on both sides of each of the magnetic core groups.

[0020] Optionally, the two side portions of the U-shaped magnetic core are respectively located in different windings.

[0021] Optionally, in the first direction, there are at least two magnetic core groups;

[0022] The two side portions located in different U-shaped magnetic cores and adjacent to each other in the first direction are located in the same winding, and / or the same I-shaped magnetic core is provided between two magnetic core groups adjacent to each other in the first direction.

[0023] Optionally, in the first direction, there are at least three magnetic core groups; in the first direction, the I-type magnetic cores are distributed between two adjacent magnetic core groups.

[0024] Optionally, in any two adjacent magnetic core groups in the first direction, the winding is arranged between the two side portions of the U-shaped magnetic core, and the winding is shared by two side portions located in different U-shaped magnetic cores and adjacent in the first direction.

[0025] Optionally, there are at least two magnetic core groups, and at least two of the magnetic core groups are sequentially distributed along a third direction, the third direction is a thickness direction of the U-shaped magnetic core, and the magnetic core groups sequentially distributed along the third direction share the winding;

[0026] And / or, there are at least two windings, and at least two of the windings are distributed in sequence along a second direction, and the second direction is the axial direction of the winding; and at least two of the windings distributed in sequence along the second direction correspond to the same magnetic core unit.

[0027] Optionally, the number of the winding is one; or, the number of the winding is at least two, each two windings are relatively independent, and any one of the windings can enable the corresponding magnetic core group to form a closed magnetic circuit.

[0028] Based on the reactor provided above, the present application also provides a power converter, which includes the reactor described in any one of the above items.

[0029] In the reactor provided by the present application, the magnetic core group includes two U-shaped magnetic cores with openings facing each other, the closed end of the U-shaped magnetic core is opposite to the end of the winding and is located outside the winding, and the two sides of the U-shaped magnetic core are respectively located inside and outside the same winding, so that the side of the U-shaped magnetic core and the winding can limit each other in the radial direction of the winding, and the side constrains the radial size of the winding, reducing the deviation in the outer diameter size of the winding, thereby reducing the size of the winding; because the closed end of the U-shaped magnetic core is opposite to the end of the winding, and the closed end is located outside the winding, so that the closed end of the U-shaped magnetic core and the winding can limit each other in the axial direction of the winding, the closed end constrains the axial size of the winding, reducing the deviation in the axial size of the winding, thereby reducing the size of the winding. Therefore, the above-mentioned reactor reduces the size of the winding, thereby reducing the volume of the winding, and then reducing the volume of the entire reactor, and improving the energy density of the reactor, so as to facilitate the improvement of the power density of the power converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of the structure of a reactor provided by the prior art;

[0032] Figure 2 An axonometric diagram of the reactor provided in Embodiment 1 of the present application;

[0033] Figure 3 for Figure 2 The front view of the reactor shown;

[0034] Figure 4 for Figure 2 Schematic diagram of the structure of the middle magnetic group and the I-type magnetic core;

[0035] Figure 5 Another isometric view of the reactor provided in the first embodiment of the present application;

[0036] Figure 6 for Figure 5 The front view of the reactor shown;

[0037] Figure 7 Another isometric view of the reactor provided in the first embodiment of the present application;

[0038] Figure 8 for Figure 7 A top view of the reactor shown;

[0039] Fig. 9 Another isometric view of the reactor provided in the first embodiment of the present application;

[0040] Fig.10 An axonometric diagram of the reactor provided in the second embodiment of the present application;

[0041] Fig.11 for Fig.10 The front view of the reactor shown;

[0042] Fig.12 Another isometric view of the reactor provided in the second embodiment of the present application;

[0043] Fig.13 for Fig.12 The front view of the reactor shown;

[0044] Fig.14 An axonometric diagram of the reactor provided in Example 3 of the present application;

[0045] Fig.15 for Fig.14 The front view of the reactor shown;

[0046] Fig.16 An axonometric diagram of the reactor provided in Embodiment 4 of the present application;

[0047] Fig.17for Fig.16 The front view of the reactor shown;

[0048] Fig.18 An axonometric diagram of the reactor provided in Embodiment 5 of the present application;

[0049] Fig.19 for Fig.18 The front view of the reactor is shown.

[0050] Description of reference numerals:

[0051] 01 is the magnetic core, 02 is the winding, 03 is the series connection, 04 is the magnetic circuit, and 05 is the external angle;

[0052] 1 is a core group, 11 is a U-shaped core, 111 is a closed end, 112 is a side, 113 is an opening, 2 is a winding, 21 is a winding body, 22 is a connection end, 3 is an I-shaped core, 4 is a closed magnetic circuit, and 5 is a magnetic circuit. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be used as limitations on the present application. As used in the specification and the appended claims of the present application, the singular expressions "one", "a kind", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the embodiments of the present application, "one or more" refers to one, two or more; "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0055] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0056] At present, the reactor is a combination structure of a square-shaped magnetic core, such as Figure 1 As shown, in the U-shaped magnetic core combination structure, two windings 02 are connected in series through a series line 03, and the magnetic core 01 forms a magnetic circuit 04 under the action of the two series-connected windings 02.

[0057] In the U-shaped magnetic core combination structure, the outer diameter of winding 02 is difficult to limit, and the upper deviation of the outer diameter of winding 02 (the upper limit deviation refers to the algebraic difference obtained by subtracting the maximum limit size from its basic size) is large, which makes the outer diameter of the entire winding 02 larger, that is, the volume of the entire winding 02 is larger, resulting in a larger volume of the entire inductor, which limits the improvement of the energy density of the inductor and hinders the improvement of the power density of the power converter.

[0058] In addition, part of the winding 02 is located outside the entire magnetic core 01, and there is a vacant space at the outer corner 05 of the winding 02 and the magnetic core 01. The vacant space is not occupied, so that the entire inductor occupies a larger space, resulting in limited improvement in the energy density of the inductor, which hinders the improvement of the power density of the power converter.

[0059] In addition, in the U-shaped magnetic core combination structure, the spacing accuracy requirements for the two windings 02 and the length accuracy requirements for the series line 03 are relatively high, resulting in a high winding accuracy for the winding 02. The winding of the winding 02 relies on advanced CNC winding equipment, resulting in a high cost for the winding 02, which also makes the cost of the reactor higher.

[0060] In order to solve the above problems, the present invention provides a reactor to reduce the volume of the reactor and increase the energy density of the reactor, thereby facilitating the improvement of the power density of the power converter.

[0061] Combination Figure 2-Figure 19 As shown, the reactor provided in the embodiment of the present application includes a magnetic core unit and a winding 2. The magnetic core unit includes a magnetic core group 1.

[0062] like Figure 2As shown, the magnetic core group 1 includes two U-shaped magnetic cores 11 with openings facing each other. The U-shaped magnetic core 11 includes a closed end 111 and two side portions 112 both fixedly connected to the closed end 111, wherein the two side portions 112 are located on the same side of the closed end 111, there is a preset distance between the two side portions 112, and an opening 113 is formed at one end of the two side portions 112 away from the closed end 111.

[0063] In the U-shaped magnetic core 11, the two side portions 112 can be arranged in parallel or can be relatively inclined. In order to facilitate winding the winding 2, the two side portions 112 can be selected to be parallel. The closed end portion 111 can be a straight-line structure, or a curved structure or a broken-line structure. In order to reduce the volume, the closed end portion 111 can be selected to be a straight-line structure, and the two side portions 112 are perpendicular to the closed end portion 111.

[0064] The closed end portion 111 and the side portion 112 may be a split structure or an integrated structure, which may be selected according to actual conditions.

[0065] like Figure 3 As shown, in the U-shaped magnetic core 11, the direction in which the two side portions 112 are sequentially distributed is the first direction; in the magnetic core group 1, the direction in which the two U-shaped magnetic cores 11 are sequentially distributed is the second direction, and the second direction is perpendicular to the first direction. The length direction of the side portion 112 can also be the second direction.

[0066] In the reactor, the closed end 111 of the U-shaped magnetic core 11 is located outside the winding 2, and the closed end 111 is adjacent to and opposite to one end of the winding 2. The two side portions 112 of the U-shaped magnetic core 11 are respectively located inside and outside the same winding 2. The magnetic core group 1 is used to form a closed magnetic circuit 4 under the action of the corresponding winding 2.

[0067] It should be noted that part of the winding 2 is located between the two side portions 112. The length direction of the side portion 112 is consistent with the axial direction of the winding 2. For example, the length direction of the side portion 112 is parallel to the axial direction of the winding 2, and the axial direction of the winding 2 is the second direction. The end of the winding 2 is the end of the winding 2 in the axial direction.

[0068] In the reactor provided in the embodiment of the present application, since the two side portions 112 of the U-shaped magnetic core 11 are respectively located inside and outside the same winding 2, part of the winding 2 is located between the two side portions 112, and the side portions 112 of the U-shaped magnetic core 11 and the winding 2 can limit each other in the radial direction of the winding 2. The side portions constrain the radial dimension of the winding 2, reduce the deviation in the outer diameter dimension of the winding 2, and thus reduce the size of the winding 2.

[0069] It should be noted that the side portion 112 can directly constrain the inner diameter of the winding 2. Since the diameter of the cable in the winding 2 is determined, the side portion 112 indirectly constrains the outer diameter of the winding 2. The side portion 112 can also directly constrain the outer diameter of the winding 2.

[0070] In the reactor provided in the embodiment of the present application, since the closed end 111 of the U-shaped magnetic core 11 is opposite to the end of the winding 2, and the closed end 111 is located outside the winding 2, the closed end 111 of the U-shaped magnetic core 11 and the winding 2 can limit each other in the axial direction of the winding 2, and the closed end 111 constrains the axial dimension of the winding 2, reduces the axial dimension deviation of the winding 2, and thus reduces the size of the winding 2.

[0071] As described above, the reactor provided in the embodiment of the present application reduces the size of the winding 2, thereby reducing the volume of the winding 2, and further reducing the volume of the reactor, thereby increasing the energy density of the reactor, thereby facilitating improving the power density of the power converter.

[0072] It should be noted that, when the cross section of the winding 2 is non-circular, the radial direction mentioned above is the width direction of the winding 2. The width direction of the winding 2 is parallel to the first direction.

[0073] In the above reactor, there can be one or more windings 2. When there is one winding 2, compared with the prior art, two windings 2 do not need to be connected in series, which reduces the winding accuracy of the winding 2, thereby reducing the cost of the winding 2 and further reducing the cost of the reactor.

[0074] When there are two or more windings 2 (including two), each two windings 2 are relatively independent, and any winding 2 can make the corresponding magnetic core group 1 form a closed magnetic circuit 4. In this way, there is no need to connect two windings 2 in series, which reduces the winding accuracy of the winding 2 compared with the prior art, thereby reducing the cost of the winding 2 and further reducing the cost of the reactor.

[0075] It should be noted that the above-mentioned winding 2 includes: a winding body 21, and two connection ends 22 that are electrically connected to the winding body 21, wherein the two connection ends 22 are respectively an input connection end and an output connection end, the input connection end is used to electrically connect to the AC output end of the power module of the power converter, and the output connection end is used to electrically connect to the AC input end of the AC module of the power converter.

[0076] In some embodiments, the magnetic core unit may further include an I-type magnetic core 3 .

[0077] As mentioned above, the two side portions 112 of the U-shaped magnetic core 11 are sequentially distributed along the first direction. In the above reactor, in the first direction, at least one side of at least one magnetic core group 1 is distributed with an I-shaped magnetic core 3. At least one winding 2 corresponds to the I-shaped magnetic core 3, and the I-shaped magnetic core 3 is used to form a magnetic circuit 5 under the action of the corresponding winding 2.

[0078] It should be noted that the I-type magnetic core 3 is in the shape of a long strip, for example, the I-type magnetic core 3 is in the shape of a rectangular parallelepiped. The length direction of the I-type magnetic core 3 is consistent with the axial direction of the winding 2, for example, the length direction of the I-type magnetic core 3 is parallel to the axial direction of the winding 2, that is, the length direction of the I-type magnetic core 3 is parallel to the second direction.

[0079] In the above reactor, there is a gap between the I-type magnetic core 3 and the U-type magnetic core 11 . When the winding 2 is energized, the magnetic flux lines outside the I-type magnetic core 3 enter the air, and the magnetic flux lines inside the I-type magnetic core 3 pass through the I-type magnetic core 3 .

[0080] In the above reactor, by adding the I-type magnetic core 3, the inductance of the reactor is increased, and the size of the winding 2 can be reduced when the inductance of the reactor remains unchanged, and the space reduced after reducing the size of the winding 2 is much larger than the space occupied by the I-type magnetic core 3. Therefore, the above structure reduces the space occupied by the reactor and improves the energy density of the reactor, thereby facilitating the improvement of the power density of the power converter, and can meet the application trend of heavy load or even multiple overload working inductance and improving power density.

[0081] In the corresponding winding 2 and I-type magnetic core 3, the I-type magnetic core 3 may pass through the winding 2 or may not pass through the winding 2. In order to increase the magnetic flux of the magnetic circuit 5, the I-type magnetic core 3 may be selected to pass through the corresponding winding 2, thereby increasing the heavy-load working inductance of the reactor. In some embodiments, in the corresponding winding 2 and I-type magnetic core 3, the I-type magnetic core 3 passes through the winding 2 along the axial direction of the winding 2.

[0082] In the above reactor, each winding 2 may have an I-type magnet 3 corresponding thereto, or only some windings 2 may have an I-type magnetic core 3 corresponding thereto. In order to increase the inductance of the reactor, each winding 2 may have an I-type magnet 3 corresponding thereto, and further, each winding 2 may have an I-type magnetic core 3 passing therethrough.

[0083] The distribution mode of the I-type magnetic core 3 and the magnetic core group 1 is selected according to actual conditions.

[0084] In some embodiments, in the first direction, an I-type magnetic core 3 is distributed on one side of at least one magnetic core group 1. In this case, there may be one or more than two magnetic core groups 1.

[0085] When there are two or more magnetic core groups 1, on the one hand, Figure 2-Figure 13As shown, in the first direction, there are at least two magnetic core groups 1; every two magnetic core groups 1 form a magnetic core assembly; in each magnetic core assembly, there is an I-type magnetic core 3 distributed between the two magnetic core groups 1. Of course, in each magnetic core assembly, there can also be more than two I-type magnetic cores 3 between the two magnetic core groups 1.

[0086] On the other hand, Fig.14 and Fig.15 As shown, in the first direction, there are at least two magnetic core groups 1 and at least two I-type magnetic cores 3, wherein all magnetic core groups 1 are distributed between two I-type magnetic cores 3. It should be noted that, in the first direction, the I-type magnetic core 3 is distributed on the side away from each other of the two magnetic core groups 1 at both ends.

[0087] In other embodiments, Fig.16 and Fig.17 As shown, in the first direction, I-type magnetic cores 3 are distributed on both sides of each magnetic core group 1. In this case, in the first direction, the number of I-type magnetic cores 3 is greater than the number of magnetic core groups 1, and the difference between the number of I-type magnetic cores 3 and the number of magnetic core groups 1 is one.

[0088] In other embodiments, Fig.18 and Fig.19 As shown, in the first direction, there are at least three magnetic core groups 1; in the first direction, the I-type magnetic cores 3 are distributed between two adjacent magnetic core groups 1. In this case, in the first direction, the number of I-type magnetic cores 3 is less than the number of magnetic core groups 1, and the difference between the number of magnetic core groups 1 and the number of I-type magnetic cores 3 is one.

[0089] In the above reactor, when there are at least two magnetic core groups 1, the magnetic core groups 1 can be selected to be distributed along other directions. Figure 7 and Figure 8 As shown, at least two magnetic core groups 1 are sequentially distributed along the third direction, and the third direction is the thickness direction of the U-shaped magnetic core 11. It should be noted that the third direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction.

[0090] In order to reduce the volume of the reactor, the common winding 2 of the magnetic core groups 1 distributed in sequence along the third direction may be selected.

[0091] In the above reactor, the winding 2 may be one or more than two. In the case where the winding 2 is at least two, as Fig. 9 As shown, at least two windings 2 can be selected to be distributed in sequence along the second direction, and at least two windings 2 distributed in sequence along the second direction correspond to the same magnetic core unit.

[0092] In the above reactor, the relative positions of the winding 2 and the magnetic core unit are selected according to actual conditions.

[0093] Five arrangements of the winding 2 and the magnetic core unit are described below in conjunction with five embodiments.

[0094] Embodiment 1

[0095] like Figure 2-Figure 9 As shown, the reactor provided in the first embodiment includes a magnetic core unit and a winding 2.

[0096] In the first embodiment, the magnetic core unit includes a magnetic core group 1 and an I-type magnetic core 3 .

[0097] The magnetic core group 1 includes two U-shaped magnetic cores 11 with openings facing each other. The closed end 111 of the U-shaped magnetic core 11 faces the end of the winding 2, and the closed end 111 is located outside the winding 2. The two side portions 112 of the U-shaped magnetic core 11 are respectively located inside and outside the same winding 2. The magnetic core group 1 is used to form a closed magnetic circuit 4 under the action of the winding 2 corresponding to it.

[0098] In the U-shaped magnetic core 11, the direction in which the two side portions 112 are sequentially distributed is the first direction, the axial direction of the winding 2 is the second direction, and the second direction is perpendicular to the first direction. In the magnetic core group 1, the direction in which the two U-shaped magnetic cores 11 are sequentially distributed is the second direction.

[0099] In the first direction, at least one side of at least one magnetic core group 1 is distributed with an I-type magnetic core 3. At least one winding 2 corresponds to the I-type magnetic core 3, and the I-type magnetic core 3 is used to form a magnetic circuit 5 under the action of the corresponding winding 2. Among the corresponding windings 2 and I-type magnetic cores 3, the I-type magnetic core 3 passes through the winding 2.

[0100] like Figure 2-Figure 4 As shown, there are two magnetic core groups 1 and they are sequentially distributed along the first direction, and the two magnetic core groups 1 form a magnetic core assembly. In the magnetic core assembly, an I-type magnetic core 3 is distributed between the two magnetic core groups 1. In the magnetic core assembly, a winding 2 is sleeved between the two side portions 112 of the U-shaped magnetic core 11.

[0101] It should be noted that in the magnetic core assembly, there are four side portions 112 and they are distributed in sequence in the first direction, the two side portions 112 located in the middle in the first direction are located inside the winding 2, and the two side portions 112 located at both ends in the first direction are located outside the winding 2. That is, in each U-shaped magnetic core 11, one side portion 112 is located inside the winding 2, and the other side portion 112 is located outside the winding 2. In this way, it is ensured that the I-type magnetic core 3 can pass through the corresponding winding 2, and each winding 2 has an I-type magnetic core 3 passing through, which increases the inductance of the reactor and can reduce the volume of the reactor.

[0102] Figure 3 In the figure, the direction of the closed magnetic circuit 4 is counterclockwise, and the direction of the magnetic circuit 5 is vertically downward. Figure 3In the figure, the directions of the closed magnetic circuit 4 and the magnetic circuit 5 are only for illustration, and the direction of the closed magnetic circuit 4 may be clockwise and the direction of the magnetic circuit 5 may be vertically upward.

[0103] like Figure 5 and Figure 6 As shown, it is also possible to select a core assembly in which two windings 2 are sleeved between the two side portions 112 of the U-shaped core 11. In this case, the two windings 2 are sequentially distributed along the axial direction of the winding 2, that is, the two windings 2 are sequentially distributed along the second direction; the two windings 2 are relatively independent, and any one of the windings 2 can form a closed magnetic circuit 4 with the corresponding core group 1, and can form a magnetic circuit 5 with the corresponding I-type core 3. In this way, there is no need to connect the two windings 2 in series, and compared with the prior art, the winding accuracy of the winding 2 is reduced, thereby reducing the cost of the winding 2, and further reducing the cost of the reactor. Moreover, the above-mentioned reactor can be used as two inductors, saving space occupation.

[0104] It should be noted that each winding 2 makes the closed magnetic circuit 4 formed by the magnetic core group 1 have the same direction, and each winding 2 makes the magnetic circuit 5 formed by the I-type magnetic core 3 have the same direction.

[0105] Figure 6 In the figure, the direction of the closed magnetic circuit 4 is counterclockwise, and the direction of the magnetic circuit 5 is vertically downward. Figure 6 In the figure, the directions of the closed magnetic circuit 4 and the magnetic circuit 5 are only for illustration, and the direction of the closed magnetic circuit 4 may be clockwise and the direction of the magnetic circuit 5 may be vertically upward.

[0106] In actual situations, it is also possible to select that in the magnetic core assembly, more than three windings 2 are sleeved between the two side portions 112 of the U-shaped magnetic core 11, and the present invention is not limited to Figure 5 and Figure 6 The two windings 2 are shown. In this way, the reactor can be used as three or more inductors, which reduces the space occupied.

[0107] Figure 2-Figure 4 If the inductance of the reactor shown in FIG. 1 cannot meet the requirement, a magnetic core group 1 and / or an I-type magnetic core 3 can be added. Figure 7 and Figure 8 As shown, along the third direction, Figure 2-Figure 4 A magnetic core assembly and an I-shaped magnetic core 3 are added to the structure shown. In this way, the inductance of the reactor is effectively increased, and the size of the winding 2 is avoided from being increased. The third direction is the thickness direction of the U-shaped magnetic core 11.

[0108] In actual situations, you can also choose to go along the third direction. Figure 2-Figure 4On the basis of the structure shown, the same number of magnetic core components and I-type magnetic cores 3 are added, or at least one magnetic core component is added. Based on this, there are at least two magnetic core groups 1, and at least two magnetic core groups 1 are sequentially distributed along the third direction, and the magnetic core groups 1 sequentially distributed along the third direction share the winding 2. When there are at least two I-type magnetic cores 3 along the third direction, the I-type magnetic cores 3 sequentially distributed along the third direction share the winding 2.

[0109] It should be noted that the thickness direction of the U-shaped magnetic core 11 is perpendicular to the first direction and the axial direction of the winding 2 .

[0110] Figure 5 and Figure 6 The structure shown, and Figure 7 and Figure 8 The structures shown can be combined, and the combined structure is as follows Fig. 9 As shown, in this way, the inductance of the reactor is increased and it can also be used as two inductors, reducing the space occupied.

[0111] As shown above, in Fig. 9 On the basis of the structure shown, the number of windings 2 can be increased in the second direction, and the number of magnetic core components and the number of I-type magnetic cores 3 can be increased in the third direction.

[0112] In the first embodiment, the side 112 of the U-shaped magnetic core 11 directly limits the outer diameter of the winding 2, which is beneficial to reducing the deviation in the outer diameter of the winding 2, thereby reducing the volume of the winding 2, and further reducing the volume of the entire inductor, improving the energy density of the inductor, and facilitating the improvement of the power density of the power converter; moreover, there is also a partial structure of the U-shaped magnetic core 11 on the periphery of the winding 2, so that there is no vacancy on the periphery of the entire inductor. Compared with the prior art in which there is a vacancy at the outer corner of the winding and the magnetic core, the space occupied by the inductor is effectively reduced, the energy density of the inductor is improved, and the power density of the power converter is facilitated to improve the power density of the power converter.

[0113] Embodiment 2

[0114] like Figure 10-13 As shown, the difference between the reactor provided in the second embodiment and the reactor provided in the first embodiment mainly lies in that the distribution direction of the magnetic core components is different.

[0115] like Fig.10 and Fig.11 As shown, in the first direction, the number of the magnetic core components is three. Accordingly, in the first direction, the number of the I-type magnetic cores 3 is three, and the number of the windings 2 is three. In the first direction, every two magnetic core components correspond to different windings 2.

[0116] Of course, the number of the magnetic core components in the first direction may be two or more than four, and the number of the I-type magnetic cores 3 in the first direction and the number of the windings 2 in the first direction may be adjusted accordingly.

[0117] It should be noted that Fig.11 The directions of the closed magnetic circuit 4 and the magnetic circuit 5 shown are only schematic, and the directions of the closed magnetic circuit 4 and the magnetic circuit 5 may also be selected to be other directions, which are not limited in this embodiment 2.

[0118] like Fig.12 and Fig.13 As shown, in the second direction, the number of the magnetic core components is three. Correspondingly, in the second direction, the number of the I-type magnetic cores 3 is three, and the number of the windings 2 is three. In the second direction, every two magnetic core components correspond to different windings 2.

[0119] Of course, the number of magnetic core components can also be two or more than four in the distribution direction of the two U-shaped magnetic cores 11 of the magnetic core group 1. Accordingly, the number of I-shaped magnetic cores 3 in the first direction and the number of windings 2 in the first direction are adjusted.

[0120] It should be noted that Fig.13 The directions of the closed magnetic circuit 4 and the magnetic circuit 5 shown are only schematic, and the directions of the closed magnetic circuit 4 and the magnetic circuit 5 may also be selected to be other directions, which are not limited in this embodiment 2.

[0121] In the second embodiment, the distribution direction of the magnetic core components can be selected according to the space requirements, thereby improving the flexibility of use. Fig.10 and Fig.11 The structure shown, and Fig.12 and Fig.13 The structures shown can be combined to meet different needs.

[0122] In the second embodiment, the number of windings 2 may be increased in the second direction, and the number of magnetic core components and the number of I-type magnetic cores 3 may be increased in the third direction. Please refer to the description of the first embodiment for details, which will not be repeated here.

[0123] It can be seen from the second embodiment and the first embodiment that in the first embodiment Figure 2-Figure 4 The structure shown is a basic structure. Based on the basic structure, the number of magnetic core components, I-type magnetic cores 3, and windings can be adjusted according to needs, providing flexibility in use.

[0124] In the second embodiment, the side 112 of the U-shaped magnetic core 11 directly limits the outer diameter of the winding 2, which is beneficial to reducing the deviation in the outer diameter of the winding 2, thereby reducing the volume of the winding 2, and then reducing the volume of the entire inductor, improving the energy density of the inductor, and facilitating the improvement of the power density of the power converter; moreover, there is also a partial structure of the U-shaped magnetic core 11 on the periphery of the winding 2, so that there is no vacancy on the periphery of the entire inductor. Compared with the prior art in which there is a vacancy at the outer corner of the winding and the magnetic core, the space occupied by the inductor is effectively reduced, the energy density of the inductor is improved, and the power density of the power converter is facilitated to improve the power density of the power converter.

[0125] Embodiment 3

[0126] like Fig.14 and Fig.15 As shown, the difference between the reactor provided in the third embodiment and the reactor provided in the first embodiment mainly lies in that the relative positions of the I-type magnetic core 3 and the magnetic core group 1 are different.

[0127] In the third embodiment, in the first direction, there are two magnetic core groups 1 and two I-shaped magnetic cores 3. The two magnetic core groups 1 are distributed between the two I-shaped magnetic cores 3, and the winding 2 is jacketed on the I-shaped magnetic core 3 and the side portion 112 adjacent thereto.

[0128] In the third embodiment, one side portion 112 of the U-shaped magnetic core 11 is located inside the winding 2 , and the other side portion 112 is located outside the winding 2 .

[0129] The reactor provided in the third embodiment has an increased number of magnetic cores, thereby increasing the inductance of the reactor, which is beneficial for reducing the width of the winding 2 and thus the volume of the reactor.

[0130] It should be noted that Fig.15 The directions of the closed magnetic circuit 4 and the magnetic circuit 5 shown are only schematic, and the directions of the closed magnetic circuit 4 and the magnetic circuit 5 may also be selected to be other directions, which are not limited in this embodiment 3.

[0131] In the third embodiment, at least one magnetic core assembly can be added between two magnetic core groups 1. In the magnetic assembly, a winding 2 is sleeved between two side portions 112 of the U-shaped magnetic core 11; in the magnetic assembly, no I-shaped magnetic core 3 is arranged between the two magnetic core groups 1. Thus, in the first direction, there are at least two magnetic core groups 1 and at least two I-shaped magnetic cores 3; in the first direction, all magnetic core groups 1 are distributed between the two I-shaped magnetic cores 3.

[0132] In the third embodiment, the number of windings 2 may be increased in the second direction, and the number of magnetic core components and the number of I-type magnetic cores 3 may be increased in the third direction. Please refer to the description of the first embodiment for details, which will not be repeated here.

[0133] In the third embodiment, the side 112 of the U-shaped magnetic core 11 directly limits the outer diameter of the winding 2, which is beneficial to reducing the deviation in the outer diameter of the winding 2, thereby reducing the volume of the winding 2, and then reducing the volume of the entire inductor, improving the energy density of the inductor, and facilitating the improvement of the power density of the power converter; moreover, there is also an I-type magnetic core 3 passing through the winding 2, and the I-type magnetic core 3 occupies the space at the outer corners of the winding 2 and the U-shaped magnetic core 11, reducing the empty space at the outer corners of the winding 2 and the U-shaped magnetic core 11, and compared with the prior art, the inductance of the inductor is increased, and the space occupied by the inductor is reduced when the reactor capacity density is equal, that is, the energy density of the inductor is improved, which is convenient for improving the power density of the power converter.

[0134] Embodiment 4

[0135] like Fig.16 and Fig.17 As shown, the difference between the reactor provided in the fourth embodiment and the reactor provided in the third embodiment mainly lies in that the number of windings 2 and the number of I-type magnetic cores 3 are increased.

[0136] In the fourth embodiment, in the first direction, there are two magnetic core groups 1 and three I-type magnetic cores 3; in the first direction, I-type magnetic cores 3 are distributed on both sides of each magnetic core group 1; the same I-type magnetic core 3 is arranged between two adjacent magnetic core groups 1 in the first direction; the two side portions 112 of the U-shaped magnetic core 11 are respectively located in different windings 2, and the two side portions 112 located in different U-shaped magnetic cores 11 and adjacent in the first direction are located in the same winding 2.

[0137] In the fourth embodiment, in the first direction, the number of the magnetic core group 1 may be one or more than three, and the number of the I-type magnetic cores 3 may be adjusted accordingly. Fig.16 and Fig.17 Two shown.

[0138] It should be noted that Fig.17 The directions of the closed magnetic circuit 4 and the magnetic circuit 5 shown are only schematic, and the directions of the closed magnetic circuit 4 and the magnetic circuit 5 may also be selected to be other directions, which are not limited in this embodiment 4.

[0139] In the fourth embodiment, the number of windings 2 may be increased in the second direction, and the number of magnetic core components and the number of I-type magnetic cores 3 may be increased in the third direction. Please refer to the first embodiment for details, which will not be repeated here.

[0140] In the fourth embodiment, the side 112 of the U-shaped magnetic core 11 directly limits the outer diameter of the winding 2, which is beneficial to reducing the deviation in the outer diameter of the winding 2, thereby reducing the volume of the winding 2, and then reducing the volume of the entire inductor, improving the energy density of the inductor, and facilitating the improvement of the power density of the power converter; moreover, there is also an I-type magnetic core 3 passing through the winding 2, and the I-type magnetic core 3 occupies the space at the outer corners of the winding 2 and the U-shaped magnetic core 11, reducing the empty space at the outer corners of the winding 2 and the U-shaped magnetic core 11, compared with the prior art, the inductance of the inductor is increased, and the space occupied by the inductor is reduced when the reactor capacity density is equal, that is, the energy density of the inductor is improved, which is convenient for improving the power density of the power converter.

[0141] Embodiment 5

[0142] like Fig.18 and Fig.19 As shown, in the reactor provided by the fifth embodiment, in the first direction, there are at least three magnetic core groups 1; in the first direction, an I-type magnetic core 3 is distributed between two adjacent magnetic core groups 1. In the first direction, in two adjacent magnetic core groups 1, a winding 2 is sleeved between two side portions 112 of a U-shaped magnetic core 11, and two side portions 112 located in different U-shaped magnetic cores 11 and adjacent in the first direction share the winding 2.

[0143] In the fifth embodiment, in the first direction, one side of two magnetic core groups 1 at both ends of all magnetic core groups 1 is provided with I-type magnetic cores 3, and both sides of the other magnetic core groups 1 are provided with I-type magnetic cores 3. In the first direction, two side portions 112 at both ends of all side portions 112 are located outside the winding 2, and the other side portions 112 are located inside the corresponding winding 2.

[0144] In this fifth embodiment, Fig.18 and Fig.19 On the basis of the structure shown, in the first direction, the number of magnetic core groups 1, the number of I-type magnetic cores 3 and the number of windings 2 are increased to meet the use requirements.

[0145] It should be noted that Fig.19 The directions of the closed magnetic circuit 4 and the magnetic circuit 5 shown are only schematic, and the directions of the closed magnetic circuit 4 and the magnetic circuit 5 may also be selected to be other directions, which are not limited in this embodiment 4.

[0146] In the fifth embodiment, the number of windings 2 may be increased in the second direction, and the number of magnetic core components and the number of I-type magnetic cores 3 may be increased in the third direction. Please refer to the first embodiment for details, which will not be repeated here.

[0147] In the fifth embodiment, the side 112 of the U-shaped magnetic core 11 directly limits the inner diameter and outer diameter of the winding 2, which is beneficial to reducing the deviation in the outer diameter of the winding 2, thereby reducing the volume of the winding 2, and then reducing the volume of the entire inductor, improving the energy density of the inductor, and facilitating the improvement of the power density of the power converter; moreover, there is also a partial structure of the U-shaped magnetic core 11 on the periphery of the winding 2, so that there is no vacancy on the periphery of the entire inductor. Compared with the prior art in which there is a vacancy at the outer corner of the winding and the magnetic core, the space occupied by the inductor is effectively reduced, the energy density of the inductor is improved, and the power density of the power converter is facilitated to improve the power density.

[0148] The above five embodiments merely provide five structures that are easy to use. In actual situations, other structures other than the above five embodiments may also be formed according to the above description, and this embodiment does not limit this.

[0149] In the reactor provided in the above embodiment, the combination of the U-shaped magnetic core 11 and the I-shaped magnetic core 3 has the advantages of simple structure, high power density, high reliability, and high portability, and improves the level of automated manufacturing; the magnetic circuit structure can be flexibly combined, and the full load and overload electrical performance can be improved under the same volume, thereby reducing costs, such as material costs.

[0150] Based on the reactor provided in the above embodiment, this embodiment further provides a power converter, which includes the reactor described in the above embodiment.

[0151] Since the reactor provided in the above embodiment has the above technical effect, and the above power converter includes the above reactor, the above power converter also has the corresponding technical effect, which will not be described in detail herein.

[0152] The power converter may be an inverter or a converter, etc. This embodiment does not limit the type of the power converter.

[0153] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reactor, characterized in that: It comprises a magnetic core unit and a winding; wherein the magnetic core unit comprises a magnetic core group, the magnetic core group comprises two U-shaped magnetic cores with openings facing each other, the closed end of the U-shaped magnetic core is located outside the winding, and the closed end is adjacent to and opposite to one end of the winding, the two side portions of the U-shaped magnetic core are respectively located inside and outside the same winding, and the magnetic core group is used to form a closed magnetic circuit under the action of the winding corresponding to it.

2. The reactor according to claim 1, characterized in that: The magnetic core unit also includes an I-type magnetic core; Wherein, in the first direction, at least one side of at least one of the magnetic core groups is distributed with the I-type magnetic core; the first direction is the direction in which the two side portions of the U-shaped magnetic core are distributed in sequence; At least one of the windings corresponds to the I-type magnetic core, and the I-type magnetic core is used to form a magnetic circuit under the action of the corresponding winding.

3. The reactor according to claim 2, characterized in that: In the corresponding winding and the I-type magnetic core, the I-type magnetic core passes through the winding along the axial direction of the winding.

4. The reactor according to claim 2, characterized in that: In the first direction, the I-type magnetic cores are distributed on one side of at least one of the magnetic core groups.

5. The reactor according to claim 4, characterized in that: In the first direction, there are at least two magnetic core groups, and every two magnetic core groups form a magnetic core assembly; in each magnetic core assembly, the I-type magnetic core is distributed between the two magnetic core groups.

6. The reactor according to claim 5, characterized in that: In the magnetic core assembly, the winding is sleeved between two side portions of the U-shaped magnetic core.

7. The reactor according to claim 6, characterized in that: There are at least two magnetic core components and they are distributed in sequence along the first direction; and / or, there are at least two magnetic core components and they are distributed in sequence along a second direction, the second direction is the direction in which the two U-shaped magnetic cores in the magnetic core group are distributed in sequence, and the second direction is perpendicular to the first direction.

8. The reactor according to claim 4, characterized in that: In the first direction, there are at least two magnetic core groups and at least two I-type magnetic cores; wherein all the magnetic core groups are distributed between the two I-type magnetic cores.

9. The reactor according to claim 8, characterized in that: In the first direction, there are two magnetic core groups, and the winding is coated on the I-shaped magnetic core and the side adjacent to the I-shaped magnetic core.

10. The reactor according to claim 2, characterized in that: In the first direction, the I-type magnetic cores are distributed on both sides of each magnetic core group.

11. The reactor according to claim 10, characterized in that: The two side portions of the U-shaped magnetic core are respectively located in different windings.

12. The reactor according to claim 11, characterized in that: In the first direction, there are at least two magnetic core groups; The two side portions located in different U-shaped magnetic cores and adjacent to each other in the first direction are located in the same winding, and / or the same I-shaped magnetic core is provided between two magnetic core groups adjacent to each other in the first direction.

13. The reactor according to claim 2, characterized in that: In the first direction, there are at least three magnetic core groups; in the first direction, the I-type magnetic cores are distributed between two adjacent magnetic core groups.

14. The reactor according to claim 13, characterized in that: In any two adjacent magnetic core groups in the first direction, the winding is sleeved between the two side portions of the U-shaped magnetic core, and the two side portions located in different U-shaped magnetic cores and adjacent in the first direction share the winding.

15. The reactor according to claim 1, characterized in that: There are at least two magnetic core groups, and at least two of the magnetic core groups are sequentially distributed along a third direction, the third direction is the thickness direction of the U-shaped magnetic core, and the magnetic core groups sequentially distributed along the third direction share the winding; And / or, there are at least two windings, and at least two of the windings are distributed in sequence along a second direction, and the second direction is the axial direction of the winding; and at least two of the windings distributed in sequence along the second direction correspond to the same magnetic core unit.

16. The reactor according to any one of claims 1 to 15, characterized in that: There is one winding; or, there are at least two windings, each two windings are relatively independent, and any one of the windings can make the corresponding magnetic core group form a closed magnetic circuit.

17. A power converter, characterized in that: The invention comprises a reactor as claimed in any one of claims 1 to 16.

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