Magnetic core device, magnetic core device group, and transformer

Abstract

The application provides a magnetic core device, a magnetic core device group and a transformer. The magnetic core device comprises a first magnetic core assembly and a second magnetic core assembly. The first magnetic core assembly comprises a first magnetic core body and a first winding. The first winding is arranged in a circumferential ring around the first magnetic core body. The second magnetic core assembly comprises a second magnetic core body and a second winding. The second magnetic core body is located on a side of the first winding away from the first magnetic core body. The second winding is arranged in a circumferential ring around at least part of the outer periphery of the first winding and at least part of the outer periphery of the second magnetic core body. The magnetic core device can reduce the copper loss, iron loss and volume of the winding coil transformer.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and more specifically to a magnetic core device, a magnetic core device assembly, and a transformer. Background Technology

[0002] In related technologies, traditional leakage inductance integrated transformers typically use primary and secondary coils wound simultaneously on the same core column. There can be one or more primary and secondary coils. By controlling the spacing between the primary and secondary coils, the leakage inductance of the transformer can be regulated. However, in this coil arrangement, the magnetic field strength is high near the position between two adjacent coils, which leads to a larger copper loss in the coils. Summary of the Invention

[0003] In view of the above-mentioned technical problems, the present invention provides a magnetic core device, a magnetic core device assembly and a transformer to reduce the copper loss, iron loss and volume of the transformer, so as to at least partially solve the above-mentioned technical problems.

[0004] In a first aspect, the present invention provides a magnetic core device, comprising: a first magnetic core assembly including a first magnetic core body and a first winding, the first winding being arranged circumferentially around the first magnetic core body; and a second magnetic core assembly including a second magnetic core body and a second winding, the second magnetic core body being located on the side of the first winding opposite to the first magnetic core body, the second winding being arranged circumferentially around at least a portion of the outer periphery of the first winding and at least a portion of the outer periphery of the second magnetic core body.

[0005] Optionally, the direction from the graphic center of the first magnetic core body toward the graphic center of the second magnetic core body is a first direction, and the direction perpendicular to the first direction and perpendicular to the thickness direction of the first magnetic core body is a second direction; the magnetic core device further includes side posts, the number of side posts is two, and the two side posts are arranged about the first direction on the outer periphery of the second winding; or, the two side posts are arranged about the second direction on the outer periphery of the second winding.

[0006] Optionally, the first magnetic core body is divided into at least two first magnetic core units along the first direction; and / or, the second magnetic core body is divided into at least two second magnetic core units along the first direction.

[0007] Optionally, the magnetic core device has a first symmetry plane extending along the first direction, and the magnetic core device is at least partially symmetrical about the first symmetry plane.

[0008] Optionally, in a third direction perpendicular to the first and second directions, the side post includes a first column and a second column, and an air gap channel is formed between the first column and the second column in the third direction.

[0009] Optionally, the first magnetic core body is a circular magnetic core or an elliptical magnetic core, and the second magnetic core body is a crescent-shaped magnetic core.

[0010] Optionally, the number of the second magnetic core bodies is multiple.

[0011] Optionally, a first heat dissipation duct is provided at the center of the first magnetic core body.

[0012] In a second aspect, the present invention provides a magnetic core assembly comprising at least three magnetic core devices as described in any of the above optional embodiments, wherein the at least three magnetic core devices are arranged sequentially along the same direction, which is the arrangement direction of the magnetic core assembly; the magnetic core assembly further comprises at least two side posts and / or multiple inner posts, wherein at least two side posts are arranged opposite to each other along the arrangement direction, at least one side post is located on one side of the first magnetic core device in the arrangement direction, at least another side post is located on one side of the last magnetic core device in the arrangement direction, and one or more inner posts are arranged between any two adjacent magnetic core devices.

[0013] Optionally, the first direction of each of the magnetic core devices is parallel to the arrangement direction of the magnetic core device group.

[0014] Optionally, the second direction of each of the magnetic core devices is parallel to the arrangement direction of the magnetic core device group.

[0015] Optionally, the first magnetic core body includes a plurality of first sub-magnetic cores arranged at intervals along its own thickness direction, and a first gap is provided between any two adjacent first sub-magnetic cores; and / or, the second magnetic core body includes a plurality of second sub-magnetic cores arranged at intervals along its own thickness direction, and a second gap is provided between any two adjacent second sub-magnetic cores.

[0016] Optionally, the second magnetic core body is provided with a second heat dissipation duct at its edge along the second direction.

[0017] Optionally, the edge of the first magnetic core body is provided with a notch, and the notch and the side post together form a third heat dissipation air duct.

[0018] Thirdly, the present invention provides a transformer comprising the magnetic core assembly described in any of the above-mentioned alternative embodiments.

[0019] Through the above technical solution, namely the magnetic core device provided by this invention, by changing the winding method of the winding coils, that is, changing the winding method of the first winding and the second winding, the first winding is made to wrap around the circumference of the first magnetic core body, and the second magnetic core body is placed on the side of the first winding away from the first magnetic core body. Then, the second winding is made to wrap around the outer circumference of the first winding, and the second magnetic core body is also wrapped inside it. Through the above-mentioned new winding method, the cutting length of the magnetic field lines cutting the first winding and the second winding can be significantly improved without basically increasing the winding length of the first winding and the second winding. This is because the cutting length of the magnetic field lines cutting the winding is related to the cutting length of the first winding and the cutting length of the second winding. The product of the magnetomotive force of the windings is equal to the product of the number of turns of the first or second winding and the corresponding current magnitude, i.e., H×l=N×I, where H represents the magnetomotive force of the cutting winding, l represents the cutting length of the magnetic field line cutting the winding, N represents the number of turns of the first or second winding, and I represents the current magnitude. When N and I are constant, H decreases as l increases. When H decreases, i.e. the magnetomotive force decreases, the eddy currents of the first and second windings can be significantly reduced, thereby reducing the copper losses of the first and second windings. When this magnetic core device is applied to a transformer, it can also reduce the copper losses, iron losses, and volume of the transformer. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the magnetic core device provided in an exemplary embodiment of the present invention; Figure 2 This is a right view of the magnetic core device provided in an exemplary embodiment of the present invention; Figure 3 for Figure 2 Cross-sectional view of position AA in the middle; Figure 4 This is an exploded view of the magnetic core device provided in an exemplary embodiment of the present invention; Figure 5 This is a front view of a magnetic core device provided in an exemplary embodiment of the present invention; Figure 6 for Figure 5 Cross-sectional view of the DD position in the middle; Figure 7 A top view of another embodiment of the magnetic core device provided in an exemplary embodiment of the present invention; Figure 8 for Figure 7 Cross-sectional view of the middle BB position; Figure 9 This is a schematic diagram of the structure of the magnetic core device assembly provided in an exemplary embodiment of the present invention; Figure 10 This is a top view of the magnetic core assembly provided in an exemplary embodiment of the present invention; Figure 11 for Figure 10 Cross-sectional view at position CC; Figure 12 This is a schematic diagram of another embodiment of the magnetic core device assembly provided in an exemplary embodiment of the present invention; Figure 13 This is a front view of another embodiment of the magnetic core device assembly provided in an exemplary embodiment of the present invention; Figure 14 This is an equivalent circuit diagram of the magnetic core device provided in an exemplary embodiment of the present invention; Figure 15 This is a magnetic circuit model of the magnetic core device provided in an exemplary embodiment of the present invention; Figure 16 This is an equivalent circuit diagram of the magnetic core device assembly provided in an exemplary embodiment of the present invention; Figure 17 This is a magnetic circuit model of the magnetic core device assembly provided in an exemplary embodiment of the present invention; Figure 18 This is a schematic diagram of the structure of a traditional leakage inductance integrated transformer in related technologies; Figure 19 for Figure 6 A magnified view of the area at position E in the middle.

[0022] Explanation of reference numerals in the attached figures: 1. First magnetic core assembly; 110. First magnetic core body; 111. First sub-core; 112. First spacer; 113. First heat dissipation duct; 114. Notch; 115. Second heat dissipation duct; 116. Third heat dissipation duct; 120. First winding; 2. Second magnetic core assembly; 210. Second magnetic core body; 211. Second sub-core; 212. Second spacer; 220. Second winding; 3. Side pillars; 4. First plane of symmetry; 5. Inner column. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In related technologies, traditional leakage inductance integrated transformers typically use a primary coil and a secondary coil wound simultaneously on a core column. The primary and secondary coils can each be one or more. By controlling the spacing between the primary and secondary coils, the leakage inductance of the transformer can be regulated. However, in this coil arrangement, the magnetic field strength is high near the position between two adjacent coils, which leads to a larger copper loss in the coils.

[0025] In view of the above-mentioned technical problems, a first aspect of the present invention provides a magnetic core device, with reference to... Figures 1 to 17 As shown, the magnetic core device includes a first magnetic core assembly 1 and a second magnetic core assembly 2. The first magnetic core assembly 1 includes a first magnetic core body 110 and a first winding 120, with the first winding 120 arranged circumferentially around the first magnetic core body 110. The second magnetic core assembly 2 includes a second magnetic core body 210 and a second winding 220. The second magnetic core body 210 is located on the side of the first winding 120 opposite to the first magnetic core body 110, and the second winding 220 is arranged circumferentially around at least a portion of the outer periphery of the first winding 120 and at least a portion of the outer periphery of the second magnetic core body 210.

[0026] Through the above-described solution, namely the magnetic core device provided by the present invention, by changing the winding method of the winding coils, that is, changing the winding method of the first winding 120 and the second winding 220, the first winding 120 is wound around the circumference of the first magnetic core body 110, and the second magnetic core body 210 is positioned on the side of the first winding 120 away from the first magnetic core body 110. Then, the second winding 220 is wound around the outer periphery of the first winding 120, and the second magnetic core body 210 is also wrapped within it. Through the above-described new winding method, the cutting length of the magnetic field lines cutting the first winding 120 and the second winding 220 can be significantly increased without increasing the winding length of the first winding 120 and the second winding 220. This is because the product of the cutting length of the magnetic field line cutting winding and the magnetic field strength of the cutting winding is equal to the product of the number of coil turns of the first winding 120 or the second winding 220 and the corresponding current magnitude, i.e., H×l=N×I, where H represents the magnetic field strength of the cutting winding, l represents the cutting length of the magnetic field line cutting winding, N represents the number of coil turns of the first winding 120 or the second winding 220, and I represents the current magnitude. When N and I are constant, H decreases accordingly when l increases. When H decreases, i.e., the magnetic field strength decreases, the copper loss of the first winding 120 and the second winding 220 is reduced. When this magnetic core device is applied to a transformer, it can also reduce the copper loss, iron loss and volume of the transformer.

[0027] In the above embodiments, the first winding 120 can be the primary winding and the second winding 220 can be the secondary winding. By arranging the windings in the above manner, the copper loss of the primary winding and the secondary winding can be significantly reduced. Alternatively, the first winding 120 can also be the secondary winding and the second winding 220 can also be the primary winding.

[0028] Specifically, you can refer to Figure 6 As shown, magnetic field lines wrap around and cut the first winding 120 and the second winding 220 in the direction of the arrow, respectively. The cutting length l of the magnetic field lines cutting the windings is already shown. Figure 6 As shown in the diagram, this can be understood as, when multiple magnetic core devices move along... Figure 6 When the top and bottom directions of the windings are arranged in a parallel manner, with N and I being constant, increasing the length of l will decrease H, thereby reducing the copper loss of the first winding 120 and the second winding 220.

[0029] In embodiments of the present invention, an XY coordinate system is established for the magnetic core device and the magnetic core device assembly, with reference to... Figures 1 to 13 As shown, the direction pointed to by the X arrow can be the first direction, and the direction pointed to by the Y arrow can be the second direction.

[0030] The direction of the cutting length l of the aforementioned magnetic field line winding can be understood as a direction perpendicular to the aforementioned first and second directions.

[0031] Further, refer to Figures 1 to 17 As shown, the direction from the graphic center of the first magnetic core body 110 toward the graphic center of the second magnetic core body 210 is the first direction, and the direction perpendicular to the first direction and perpendicular to the thickness direction of the first magnetic core body 110 is the second direction; the magnetic core device also includes side posts 3, the number of side posts 3 is two, the two side posts 3 are arranged about the outer periphery of the second winding 220 about the first direction; or, the two side posts 3 are arranged about the outer periphery of the second winding 220 along the second direction.

[0032] Using the methods described above, the arrangement of the side pillars 3 can be any of the suitable arrangements mentioned above, for example... Figure 3 The first direction is arranged on the outer periphery of the second winding 220, or Figure 8 The two side posts 3 can be arranged along the second direction around the outer periphery of the second winding 220. Furthermore, when the second winding 220 is axially symmetrical, the two side posts 3 can also be arranged symmetrically about the second winding 220. The appropriate arrangement can be selected based on the actual available space. With the first winding 120 and the second winding 220, as well as the first core body 110 and the second core body 210 arranged as described above, the leakage flux and excitation flux can be shunted through the two cores. This can be referenced... Figure 6 As shown, the outer ring of the magnetic field line cutting can represent the excitation flux, and the inner ring can represent the leakage flux. The flux after shunting moves along the cutting direction of the magnetic field line, and there is no change in amplitude in the direction of the magnetic circuit. This allows the magnetic flux of the first magnetic core body 110 and the second magnetic core body 210 to be more uniform, which can also reduce the volume occupied by the first magnetic core body 110 and the second magnetic core body 210 and the iron loss.

[0033] Furthermore, the number of side posts 3 is not limited to two in the above embodiment, and the arrangement position of the side posts 3, that is, the relative position of the side posts 3 and the second winding 220, can also be any suitable. For example, there can be more than two side posts 3. Multiple side posts 3 can be arranged at intervals around the outer periphery of the second winding 220. Moreover, the multiple side posts 3 can be arranged symmetrically or asymmetrically with respect to the symmetry plane of the second winding 220.

[0034] This can be understood as referring to related technologies. Figure 18 As shown, the magnetic core device used in traditional leakage inductance integrated transformers typically involves simultaneously winding the primary winding (corresponding to the first winding 120) and the secondary winding (corresponding to the second winding 220) onto the same core column, and the cutting direction of the magnetic field lines can be as follows: Figure 18As shown by the arrow, there can be one or more primary windings and secondary windings. By controlling the spacing between the primary and secondary windings, the leakage inductance of the transformer can be adjusted.

[0035] In the aforementioned traditional leakage inductance integrated transformer core assembly, due to the side posts and center posts of the core (i.e. Figure 18 The area other than the first winding 120 and the second winding 220 accounts for a high proportion of the core volume. However, the magnetic flux distribution in the side columns and the middle column is uneven. That is, at the junction of two adjacent windings (i.e., the area adjacent to the first winding 120 and the second winding 220), the magnetic flux density is greater due to the superposition of excitation flux and leakage flux. In contrast, the magnetic core at the location far from the junction of two adjacent windings is dominated by excitation flux and has a smaller magnetic flux density. This uneven magnetic flux distribution leads to the magnetic core being designed according to the magnetic flux density at the maximum point, resulting in an increase in the core volume.

[0036] Therefore, through the above-described arrangement, the magnetic flux of the first magnetic core body 110 and the second magnetic core body 210 is more uniform, which not only reduces the volume occupied by the first magnetic core body 110 and the second magnetic core body 210, but also reduces the iron loss of the first magnetic core body 110 and the second magnetic core body 210.

[0037] It should be noted that the magnetic core device mentioned in this embodiment may also include a magnetic core holder, which can connect and fix the first magnetic core body 110, the second magnetic core body 210, the first winding 120 and the second winding 220 together to form a complete magnetic core device.

[0038] You can refer to it Figure 3 , Figure 4 and Figure 5 As shown, in this embodiment, the magnetic core base and the side post 3 are integrated into one unit. In this way, the integration of the magnetic core device can be improved, and effective support stability and stable limiting effect can be provided for the first magnetic core body 110, the second magnetic core body 210, the first winding 120 and the second winding 220.

[0039] In some implementation methods, reference may be made to Figure 3 As shown, the first magnetic core body 110 can be divided into at least two first magnetic core units along the first direction; and / or, the second magnetic core body 210 can be divided into at least two second magnetic core units along the first direction.

[0040] By dividing the first magnetic core body 110 into multiple first magnetic core units along the first direction and / or dividing the second magnetic core body 210 into multiple second magnetic core units along the first direction in the above manner, the eddy current loss of the magnetic core device can be further reduced. That is, the first magnetic core body 110 and / or the second magnetic core body 210 can be cut and divided. Furthermore, the cut surfaces between every two adjacent first magnetic core units and / or second magnetic core units after cutting can be insulated.

[0041] Furthermore, the number of the aforementioned first magnetic core unit and / or second magnetic core unit can be any suitable number of two or more, and the cutting surfaces of the multiple first magnetic core units and / or second magnetic core units can all be parallel to the first direction, thereby reducing the eddy current loss of the magnetic core device as a whole.

[0042] In some implementations, reference Figures 1 to 17 As shown, the magnetic core device has a first symmetry plane 4 extending along a first direction, and the magnetic core device as a whole is at least partially symmetrical about the first symmetry plane 4.

[0043] By arranging the magnetic core device in the above manner, at least partially symmetrical about the first symmetry plane 4, eddy current losses can be reduced.

[0044] The equivalent magnetic circuit scheme corresponding to the above-mentioned magnetic core device (i.e., single-phase transformer) is as follows: Figure 15 As shown, Figure 15 From left to right, the following are the locations for setting magnetic resistance. The first magnetic branch is equipped with The second magnetic branch, and two parallel branches The two third magnetic branches, on the first magnetic branch, correspond to the corresponding magnetic circuit of the first magnetic core body 110. Let the current of the first winding 120 be... The current in the second winding 220 is , This represents the 120 turns of the first winding. This represents the 220 turns of the second winding. This represents the magnetic reluctance generated by the 120-segment air gap of the first winding connected in series.

[0045] The second magnetic branch corresponds to the magnetic circuit of the second magnetic core body 210, and the second winding 220 is provided on this magnetic circuit. The generated magnetomotive force is connected in series with the magnetic reluctance generated by the 220-segment air gap of the second winding. .

[0046] The third magnetic branch corresponds to the magnetic branch of side post 3. This magnetic branch has no series winding magnetomotive force, only the equivalent magnetic reluctance after parallel connection. When the side column 3 has no air gap or the middle column has no air gap, their corresponding magnetic resistance is zero.

[0047] The equivalent circuit diagram of the above magnetic core device is as follows: Figure 14 As shown, based on reasonable physical turns and target transformer parameters, including n, and Where n represents the equivalent turns ratio, Represents leakage inductance. Representing the magnetizing inductance, the values ​​of the three reluctances are adjusted, i.e., the values ​​mentioned above are adjusted. , as well as The target value can be obtained by adjusting the size of the air gap. The three formulas for adjusting the magnetic reluctance are shown below. This scheme replaces the traditional method of adjusting the winding spacing by adjusting the air gap size, resulting in better consistency.

[0048]

[0049]

[0050]

[0051] Where Ns is the number of turns on the primary side and Np is the number of turns on the secondary side.

[0052] Based on the above methods, combined with Figure 3 , Figure 6 and Figure 19 As shown, in a third direction perpendicular to the first and second directions, the side post 3 includes a first post 310 and a second post 320, and in the third direction, an air gap channel 301 is formed between the first post 310 and the second post 320.

[0053] In the above manner, the length of the air gap channel 301 between the first column 310 and the second column 320, that is, the distance between the first column 310 and the second column 320, which corresponds to the air gap of the side column 3, can be adjusted by changing the length of the air gap channel 301. The size is adjustable to achieve the function of adjustable turns ratio of the magnetic core device.

[0054] Specifically, this embodiment describes the overall scheme of the above-mentioned magnetic core device as follows.

[0055] The overall magnetic core device includes a primary winding coil (corresponding to the first winding 120), a secondary winding coil (corresponding to the second winding 120), a first magnetic core body 110, and a second magnetic core body 210. The first magnetic core body 110 can be circular or elliptical, and the second magnetic core body 210 can be crescent-shaped. The second magnetic core body 210 is sandwiched between the first winding 120 and the second winding 220. Both the first magnetic core body 110 and the second magnetic core body 210 adopt multiple air gaps and magnetic pillars (corresponding to the first sub-core 111 and the second sub-core 211 below). The magnetic pillars can be separated by air gap plates (corresponding to the first gap plate 112 and the second gap plate 212 below). However, the number of segments and the length of the air gaps of the first magnetic core body 110 and the second magnetic core body 210 can be the same or different. Furthermore, a first heat dissipation duct 113 can be provided on the first magnetic core body 110 to improve the overall heat dissipation capacity of the magnetic core device.

[0056] Furthermore, there can be multiple second magnetic core bodies 210. For example, there can be two second magnetic core bodies 210. The two second magnetic core bodies 210 are arranged circumferentially between the first magnetic core body 110. The two second magnetic core bodies 210 can be arranged symmetrically or axially about the first magnetic core body 110. Under the above arrangement, the overall structure of the magnetic core device can be more symmetrical, so as to further balance the magnetic flux and reduce magnetic loss.

[0057] In a second aspect, the present invention provides a magnetic core assembly comprising at least three magnetic core devices as described in the above embodiments, wherein the at least three magnetic core devices are arranged sequentially in the same direction; the direction is the arrangement direction of the magnetic core assembly; and the magnetic core assembly also has all the beneficial effects of the above embodiments, wherein the magnetic core assembly further comprises at least two side posts 3 and / or multiple inner posts 5, wherein the at least two side posts 3 are arranged opposite each other in the arrangement direction, at least one side post 3 is located on one side of the first magnetic core device in the arrangement direction, at least another side post 3 is located on one side of the last magnetic core device in the arrangement direction, and one or more inner posts 5 are arranged between any two adjacent magnetic core devices.

[0058] In the above manner, when the magnetic core assembly includes three magnetic core devices, the assembly can be installed in a three-phase transformer. This three-phase transformer can be a transformer used in a dual active bridge converter. (Refer to...) Figure 16The transformer is a YY-type (star-star) connected LCC (Line commutated converter) topology transformer, wherein the transformer may include three independent phases, each phase includes two core columns, corresponding to the first core body 110 and the second core body 210 mentioned in the above embodiment. Each phase includes a first core body 110, a second core body 210, a first winding 120 and a second winding 220, and two side columns 3 on the outside. The orientation of the two side columns 3 can be collinear with or perpendicular to the arrangement direction of the three phases.

[0059] Furthermore, when multiple magnetic core devices are arranged, the orientation of the first magnetic core body 110 and the second magnetic core body 210 can be arbitrarily suitable.

[0060] For example, in some implementations, reference Figure 11 As shown, the first direction of each magnetic core device is parallel to the arrangement direction of the magnetic core device group.

[0061] Alternatively, in other implementations, refer to Figure 12 and Figure 13 As shown, the second direction of each magnetic core assembly is parallel to the arrangement direction of the magnetic core assembly group. Further, referring to... Figures 1 to 15 As shown, the first magnetic core body 110 is a circular magnetic core or an elliptical magnetic core, and the second magnetic core body 210 is a crescent-shaped magnetic core.

[0062] In the above manner, the circular or elliptical first magnetic core body 110 and the crescent-shaped second magnetic core body 210 can cooperate with each other to further improve the integration of the magnetic core device and the magnetic core device assembly. This can be referred to... Figure 8 As shown, the inner arc surface of the crescent-shaped second magnetic core body 210 can face the outer wall of the circular or elliptical first magnetic core body 110, so as to further improve the space occupied by the magnetic core device and the magnetic core device assembly.

[0063] In some implementations, reference Figures 1 to 15 As shown, the first magnetic core body 110 includes a plurality of first sub-magnetic cores 111 arranged at intervals along its own thickness direction, and a first spacer 112 is provided between any two adjacent first sub-magnetic cores 111; and / or, the second magnetic core body 210 includes a plurality of second sub-magnetic cores 211 arranged at intervals along its own thickness direction, and a second spacer 212 is provided between any two adjacent second sub-magnetic cores 211.

[0064] By setting the first gap plate 112 and the second gap plate 212, the air gap length of the first magnetic core body 110 and the second magnetic core body 210 can be adjusted, thereby controlling the equivalent parameters of the transformer and realizing the free adjustment of the equivalent turns ratio of the transformer.

[0065] This can be understood as follows: between any two adjacent first sub-cores 111, the air gap length of any two adjacent first sub-cores 111 can be adjusted by adjusting the number and length of the first gap plates 112; and / or, between any two adjacent second sub-cores 211, the air gap length of any two adjacent second sub-cores 211 can be adjusted by adjusting the number of the second gap plates 212.

[0066] Furthermore, in order to further reduce the eddy current loss of the magnetic core assembly, the first sub-core 111 and / or the second sub-core 211 can be further split into separate parts. That is, the first sub-core 111 and / or the second sub-core 211 can be split into separate parts again along the direction perpendicular to their own thickness. Each first sub-core 111 includes at least two first core units arranged at intervals; and / or each second sub-core 211 includes at least two second core units arranged at intervals. Moreover, the cut surfaces between each pair of adjacent first core units and / or between each pair of adjacent second core units can be insulated, thereby further reducing eddy current loss.

[0067] Further, refer to Figures 1 to 15 As shown, a first heat dissipation duct 113 is provided at the center of the first magnetic core body 110. The first heat dissipation duct 113 can provide heat dissipation for the first winding 120 and the second winding 220. Alternatively, the first heat dissipation duct 113 can be provided in other locations, such as the side of the circular magnetic core, the fixed point of the elliptical magnetic core, or the edge of the second magnetic core body 210.

[0068] The first heat dissipation duct 113 can blow air into the entire magnetic core assembly, and at the same time dissipate heat for the first winding 120 and the second winding 220, as well as the first magnetic core body 110 and the second magnetic core body 210.

[0069] Or, in another implementation, in Figure 8 In the example, the second magnetic core body 210 is provided with a second heat dissipation duct 115 at the edge along the second direction.

[0070] In the above manner, that is, the opening provided by the side post 3 and the edge of the second magnetic core body 210 together form the second heat dissipation air duct 115, which can further improve the heat dissipation of the second magnetic core body 210.

[0071] Alternatively, in another implementation, refer to Figure 3 and Figure 8 As shown, the edge of the first magnetic core body 110 is provided with a notch 114, and the notch 114 and the side post 3 together form the third heat dissipation air duct 116.

[0072] In the above manner, that is, by slotting the surface of the first magnetic core body 110 and setting a notch 114, the notch 114 is connected to the opening of the side post 3, so that a third heat dissipation air channel 116 can be formed together to dissipate heat from the first magnetic core body 110 and the second magnetic core body 210.

[0073] For circuit topologies using three-phase transformers, such as LLC, three-phase dual active bridge converter DAB, and three-phase CLLC resonant converter using YY or other connection methods, where LLC is a dual-inductor single-capacitor resonant converter; DAB is a dual active full-bridge transformer; and CLLC is a dual-inductor dual-capacitor resonant converter, the three aforementioned magnetic core devices can be integrated into one. Since the three phases ABC are staggered by 120° and the sum of the three-phase currents is approximately zero under Y connection (star connection), the total volume and cross-sectional area of ​​the side column 3 can be significantly reduced, and magnetic integration of the transformer can be achieved, increasing the voltage regulation range of the converter.

[0074] Specifically, the overall structure of the magnetic core assembly described above is described below in this embodiment.

[0075] In a three-phase integrated transformer, the graphic center of the first magnetic core body 110 can face the graphic center of the second magnetic core body 210, and the arrangement direction of the three magnetic core devices can be the same. In this way, the side posts 3 are located on the left and right sides of the transformer, and the inner posts 5 are set in the gap of the middle post of each phase magnetic core. The side posts 3 mainly serve to provide a path for interference flux, circulating flux, and unbalanced flux. The number of inner posts 5 and side posts 3 can be reduced as needed. To reduce eddy current losses, the first magnetic core body 110 and the second magnetic core body 210 in each magnetic core device can be divided into two along the first direction. In order to further improve the processing of the first magnetic core body 110 and the second magnetic core body 210, they can be cut again on the basis of being divided into two. To ensure three-phase balance, it is generally necessary to control the number of turns of each phase to be equal, that is, the number of turns of the first winding 120 in each phase is equal, and the number of turns of the second winding 220 is also equal. The air gap length is controlled so that the three-phase magnetic reluctance is equal or approximately equal.

[0076] By opening an air gap in the side post 3 and controlling the length of the air gap, the magnetic reluctance in the side post 3 can be controlled. This allows adjustment of the magnetic flux of the core holder and the side post, thereby reducing magnetic loss or core volume. At the same time, the magnetic reluctance of the side post air gap should be much smaller than that of the middle post.

[0077] In another approach, the direction from the center of the pattern of the first magnetic core body 110 toward the center of the pattern of the second magnetic core body 210 can be perpendicular to the three-phase arrangement direction. In order to reduce eddy current losses, the first magnetic core body 110 and the second magnetic core body 210 can also be divided into two parts along the first direction. In this approach, the center or edge of the first magnetic core body 110 and the edge of the second magnetic core body 210 can be provided with a first heat dissipation channel 113.

[0078] Since the magnetic reluctance of the side post 3 is much smaller than that of the first magnetic core body 110 and the second magnetic core body 210, it plays a role in magnetic flux decoupling. Furthermore, the three phases are completely decoupled electrically, and the electrical parameters of the three phases can be adjusted independently.

[0079] It should be noted that the three-phase electrical complete decoupling mentioned above refers to eliminating the mutual coupling relationship between the electrical quantities (current, voltage, magnetic flux, etc.) of each phase of the three-phase system through specific control strategies or coordinate system transformations, so that the three-phase variables can be equivalent to independent unidirectional variables for independent control. The core objective is to simplify the control logic and improve control accuracy and dynamic response.

[0080] A three-phase integrated transformer has three phases; you can refer to [the relevant documentation]. Figure 11 As shown, each phase consists of a first magnetic core body 110, a second magnetic core body 210, a first winding 120, and a second winding 220. Specifically, refer to... Figure 11 or Figure 13 As shown, the magnetic circuit consists of three phases, A, B, and C. Further, refer to... Figure 17 As shown, each phase has two magnetic branches, namely: reluctance R m,A1 Magnetic resistance R m,A2 Two magnetomotive force sources N p I pA Voltage source N s I sA Constitutes phase A, with magnetic reluctance R m,B1 Magnetic resistance R m,B2 Two voltage sources N p I pB Voltage source N s I sB Constitutes phase B, with magnetic reluctance R m,C1 Magnetic resistance R m,C2 Two voltage sources N p I pC Voltage source N s I sC The C phase is formed, and their configuration is related to... Figure 15 Similar to the above, the entire transformer also has several parallel magnetic circuits composed of side posts, that is, it has two 2· Magnetic circuit.

[0081] To ensure the balance of the three phases A, B, and C mentioned above, it is generally necessary to control the number of turns of each phase to be equal and to control the air gap length so that the magnetic reluctance of the three phases is equal or approximately equal. Figure 17 In , .

[0082] Furthermore, the equivalent circuit diagram of the aforementioned magnetic core assembly can also be referenced. Figure 16 As shown, the equivalent turns ratio of each phase in the three phases A, B, and C can be n, and the leakage inductance of each phase can be [missing information]. The magnetizing inductance of each phase can be Furthermore, the magnetic reluctance of the three phases can be adjusted by referring to the three formulas in the above magnetic core device, which will not be elaborated further in this embodiment.

[0083] And the two 2 mentioned above The turns ratio of the magnetic circuit is adjustable, which can also be achieved by adjusting the length of the air gap channel 301 between the first column 310 and the second column 320. Furthermore, in the magnetic core assembly of this application, when phases A, B, and C are included, the side column 3 and the magnetic core base of the magnetic core assembly can be designed as an integral unit. In this way, the magnetic flux of the magnetic core base and the side column 3 can be adjusted, which can reduce magnetic loss or reduce the overall volume of the magnetic core assembly. In addition, the magnetic resistance of the air gap channel 301 at the side column 3 should be much smaller than the magnetic resistance of the first magnetic core body 110 and the second magnetic core body 210.

[0084] The above embodiments of the present invention have the following beneficial effects: reducing winding copper losses. By separating leakage flux and excitation flux in advance, the present invention can reduce the volume or iron loss of the first core body 110 and the second core body 210 by making the flux of the first core body 110, the second core body 210 and the side column 3 uniform. In particular, for a three-phase integrated transformer, since the currents of the three phases ABC are out of phase by 120° and the sum of the three phases is zero, the sum of leakage flux and excitation flux is approximately zero, and the area of ​​the side column 3 can be greatly reduced. Correspondingly, the volume and loss of the first core body 110 and the second core body 210 are also greatly reduced.

[0085] Reduce core volume or iron loss: By designing the first core body 110 and the second core body 210 separately, the eddy current loss of the core is reduced while ensuring that the uniform distribution of magnetic flux among the cores is not affected.

[0086] Improved inductance consistency: Adjusting transformer parameters by regulating the air gap length is more controllable and provides better consistency compared to controlling the winding spacing.

[0087] By adjusting the air gap length of the first magnetic core body 110, the second magnetic core body 210, and the side post 3, the transformer parameters can be freely adjusted to achieve an equivalent turns ratio that differs from the physical turns ratio.

[0088] For a three-phase transformer, due to the design of the side column 3, the three phases can be completely decoupled electrically, and the circuit parameters of the three phases can be adjusted independently.

[0089] A third aspect of the present invention provides a transformer that includes the magnetic core assembly mentioned in the above embodiments and has all the beneficial effects of the above embodiments.

[0090] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope of protection claimed by the present invention.

Claims

1. A magnetic core device, characterized in that, include: The first magnetic core assembly (1) includes a first magnetic core body (110) and a first winding (120), wherein the first winding (120) is arranged around the first magnetic core body (110) in a circumferential manner. The second magnetic core assembly (2) includes a second magnetic core body (210) and a second winding (220). The second magnetic core body (210) is located on the side of the first winding (120) away from the first magnetic core body (110). The second winding (220) is arranged around at least a portion of the outer periphery of the first winding (120) and at least a portion of the outer periphery of the second magnetic core body (210).

2. The magnetic core device according to claim 1, characterized in that, The direction from the center of the pattern of the first magnetic core body (110) toward the center of the pattern of the second magnetic core body (210) is the first direction, and the direction perpendicular to the first direction and perpendicular to the thickness direction of the first magnetic core body (110) is the second direction. The magnetic core device also includes two side posts (3), which are arranged about the first direction on the outer periphery of the second winding (220). or, The two side posts (3) are arranged along the second direction on the outer periphery of the second winding (220).

3. The magnetic core device according to claim 2, characterized in that, The first magnetic core body (110) is divided into at least two first magnetic core units along the first direction; and / or, the second magnetic core body (210) is divided into at least two second magnetic core units along the first direction.

4. The magnetic core device according to claim 2, characterized in that, The magnetic core device has a first symmetry plane (4) extending along the first direction, and the magnetic core device is at least partially symmetrical about the first symmetry plane (4).

5. The magnetic core device according to claim 2, characterized in that, In a third direction perpendicular to the first and second directions, the side post (3) includes a first post (310) and a second post (320), and an air gap channel (301) is formed between the first post (310) and the second post (320) in the third direction.

6. The magnetic core device according to any one of claims 1-5, characterized in that, The first magnetic core body (110) is a circular magnetic core or an elliptical magnetic core, and the second magnetic core body (210) is a crescent-shaped magnetic core.

7. The magnetic core device according to any one of claims 1-5, characterized in that, The number of the second magnetic core body (210) is multiple.

8. The magnetic core device according to claim 6, characterized in that, The first magnetic core body (110) has a first heat dissipation duct (113) at its center.

9. A magnetic core assembly, characterized in that, It includes at least three magnetic core devices as described in any one of claims 1-8, wherein the at least three magnetic core devices are arranged sequentially in the same direction, which is the arrangement direction of the magnetic core device group; The magnetic core assembly further includes at least two side posts (3) and / or multiple inner posts (5), at least two of the side posts (3) are arranged opposite each other along the arrangement direction, at least one of the side posts (3) is located on one side of the first magnetic core assembly in the arrangement direction, at least another side post (3) is located on one side of the last magnetic core assembly in the arrangement direction, and one or more of the inner posts (5) are arranged between any two adjacent magnetic core assemblies.

10. The magnetic core assembly according to claim 9, characterized in that, The first direction of each of the magnetic core devices is parallel to the arrangement direction of the magnetic core device group.

11. The magnetic core assembly according to claim 9, characterized in that, The second direction of each of the magnetic core devices is parallel to the arrangement direction of the magnetic core device group.

12. The magnetic core assembly according to claim 11, characterized in that, The first magnetic core body (110) includes a plurality of first sub-magnetic cores (111) arranged at intervals along its own thickness direction, and a first spacer (112) is provided between any two adjacent first sub-magnetic cores (111); and / or, the second magnetic core body (210) includes a plurality of second sub-magnetic cores (211) arranged at intervals along its own thickness direction, and a second spacer (212) is provided between any two adjacent second sub-magnetic cores (211).

13. The magnetic core assembly according to claim 11, characterized in that, The second magnetic core body (210) is provided with a second heat dissipation air duct (115) along the edge of the second direction.

14. The magnetic core assembly according to any one of claims 9-12, characterized in that, The edge of the first magnetic core body (110) is provided with a notch (114), and the notch (114) and the side post (3) together form a third heat dissipation air duct (116).

15. A transformer, characterized in that, Includes the magnetic core assembly as described in any one of claims 9-14.

Images