Transformer core, power conversion apparatus including transformer core, and photovoltaic module including power conversion apparatus

Abstract

A transformer core having an advantageous shape in terms of processing is disclosed. The present invention provides a transformer core, a power conversion apparatus including the transformer core, and a photovoltaic module including the power conversion apparatus. The transformer core includes a body having an inner wall, an intermediate wall, and an outer wall formed from the center thereof, with a first wire wound between the inner wall and the intermediate wall, and a second wire wound between the intermediate wall and the outer wall, wherein the body includes: a first body in which a portion of the inner wall and the outer wall are formed protruding from a base; and a second body in which a remaining portion of the intermediate wall and the outer wall are formed protruding from the base, wherein the second body is coupled to the first body to be overlapped thereby.

Description

Transformer core, power conversion device including transformer core, and solar module including same

[0001] The present invention relates to a transformer core, a power conversion device including the transformer core, and a solar module including the same, and more particularly, to a transformer core having a shape advantageous in terms of processing, a power conversion device including the transformer core, and a solar module including the same.

[0002] Typically, power converters are employed to provide power to solar modules, which generate renewable energy. In particular, transformers and leakage inductors are used within converters to convert the DC power generated by solar modules.

[0003] Meanwhile, when using a conventional resonant transformer, the winding space of the transformer is divided into upper and lower layers, with an air gap placed between the two layers. However, this method has the disadvantage of making it difficult to control leakage inductance because the central core space is fixed.

[0004] Meanwhile, if the transformer and leakage inductor are mounted on the circuit board separately, there is a disadvantage in that they take up a considerable amount of space.

[0005] Accordingly, efforts are being made to miniaturize the size of the transformer and leakage inductor in order to miniaturize the power conversion device, and in particular, research is being conducted on an integrated transformer that integrates the transformer and leakage inductor.

[0006] Meanwhile, in order to determine the size of leakage inductance in a transformer having leakage inductance, a gap must be machined. However, since there is a space (Area2) for machining the gap between the external space (Area3) and the internal space (Area1) of the transformer core, a process of machining only a specific space must be performed.

[0007] Referring to FIGS. 1 and 2, a conventional transformer core has an outer space (12c, 22c), an intermediate space (12b, 22b), and an inner space (12a, 22a) protruding from a base (11, 21) having the same or similar heights, and the outer and inner heights of the core (10, 20) are the same, and a gap processing portion is located in a specific space within the interior. In addition, only a specific space is processed for processing, and at this time, the interior and exterior can be processed together.

[0008] That is, the shape of the top and bottom of the transformer is the same, and the height of the outer transformer core is the same as the height of the inner transformer core, so only a specific space must be processed for processing the inner transformer core, making milling processing difficult, and ultimately, mass production was impossible, resulting in a problem of high production costs.

[0009] The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to provide a transformer core designed to enable milling operations by allowing the gap processing space and the external space of the transformer to be opened and closed by designing the shapes of the upper core and the lower core of the transformer differently.

[0010] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0011] According to one aspect of the present invention, a transformer core is provided, which includes a body in which an inner wall, an intermediate wall, and an outer wall are formed from the center, a first wire is wound between the inner wall and the intermediate wall, and a second wire is wound between the intermediate wall and the outer wall, the transformer core including: a first body in which the inner wall and a portion of the outer wall are formed protruding from a base; and a second body in which the intermediate wall and the remaining portion of the outer wall are formed protruding from a base, and is coupled to be covered by the first body.

[0012] At this time, the area of ​​the first surface of the outer wall of the first body is defined as the first area, the area of ​​the second surface of the outer wall of the second body is defined as the second area, the area of ​​the third surface of the middle wall is defined as the third area, the area of ​​the fourth surface of the inner wall is defined as the fourth area, and the sum of the first area, the second area, and the third area may be relatively larger than the fourth area.

[0013] At this time, the outer wall and the middle wall of the second body are formed to protrude from the base, and the height at which the middle wall protrudes from the base is defined as a first height, and the height at which the outer wall of the second body protrudes from the base is defined as a second height, and the first height may be relatively lower than the second height.

[0014] At this time, a part of the intermediate wall may be formed parallel to a part of the outer wall of the second body.

[0015] At this time, a pair of outer walls formed on the second body are provided and can be arranged parallel to each other on both sides of the middle wall.

[0016] At this time, the outer walls formed on the first body are provided in a pair, and can be arranged in parallel on the front and rear sides of the middle wall formed on the second body when the first body and the second body are combined.

[0017] At this time, the outer walls formed on the second body are provided in pairs and can be arranged in parallel on the front and rear sides of the middle wall.

[0018] At this time, the outer walls formed on the first body are provided in a pair, and can be arranged in parallel on both sides of the middle wall formed on the second body when the first body and the second body are combined.

[0019] At this time, among the inner wall, middle wall, and outer wall, the inner wall can be formed to have the thickest thickness.

[0020] At this time, the heights of the outer walls formed on the first body and the second body can be formed to be the same.

[0021] At this time, an entrance through which the first wire and the second wire enter and exit may be formed by partially cutting the outer wall and the middle wall.

[0022] At this time, the entrance can be formed in the same direction on the outer wall and the middle wall.

[0023] At this time, the widths of the entrances formed in the outer wall and the middle wall can be formed to be the same.

[0024] At this time, the outer surface of the inner wall facing the entrance may be formed into a curved surface.

[0025] At this time, the edge of the outer wall of the first body can come into contact with the edge of the outer wall of the second body.

[0026] At this time, when the first body and the second body are combined, the inner surface of the corner of the outer wall can be formed into a curved surface.

[0027] At this time, the outer wall of the first body and the outer wall of the second body may be formed so that a portion thereof forms a right angle.

[0028] According to one aspect of the present invention, a power conversion device including a transformer core is provided.

[0029] At this time, the power conversion device may further include a first wire wound between the inner wall and the middle wall formed in the transformer core; and a second wire wound between the middle wall and the outer wall formed in the transformer core.

[0030] According to one aspect of the present invention, a solar module is provided, including a power conversion device having a transformer core.

[0031] According to the above configuration, the transformer core according to the embodiment of the present invention is capable of being milled, so that mass production is possible, thereby drastically reducing the unit cost.

[0032] In addition, the transformer core according to the embodiment of the present invention has the advantage of being able to design a wide space for controlling leakage inductance because gap processing for controlling leakage inductance is easy.

[0033] Figure 1 is a drawing showing one type of transformer core according to the prior art.

[0034] Figure 2 is a drawing showing another type of transformer core according to the prior art.

[0035] Figure 3 is an exploded perspective view of a transformer core according to one embodiment of the present invention.

[0036] FIG. 4 is a perspective view of a second body, which is a component of a transformer core according to one embodiment of the present invention.

[0037] FIG. 5 is an operational diagram showing the direction of magnetic flux according to the current flow of the first wire of the transformer core according to one embodiment of the present invention.

[0038] FIG. 6 is an operational diagram showing the direction of magnetic flux according to the current flow of the second wire of the transformer core according to one embodiment of the present invention.

[0039] FIG. 7 is an operational diagram showing the direction of magnetic flux according to current flow in both the first and second wires of a transformer core according to one embodiment of the present invention.

[0040] Figure 8 is a circuit diagram to which a transformer core according to one embodiment of the present invention can be applied.

[0041] FIG. 9 is a circuit diagram of a dual active bridge converter to which a transformer core according to one embodiment of the present invention can be applied.

[0042] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts irrelevant to the description are omitted in the drawings, and the same reference numerals designate identical or similar components throughout the specification.

[0043] The words and terms used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, but should be interpreted in a way that is consistent with the technical idea of ​​the present invention, in accordance with the principles by which the inventor can define terms and concepts in order to best explain his or her invention.

[0044] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to a preferred embodiment of the present invention, and do not represent all of the technical ideas of the present invention, so there may be various equivalents and modified examples that can replace the configuration at the time of filing of the present invention.

[0045] In this specification, terms such as “include” or “have” are intended to describe the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0046] When a component is said to be "in front of," "behind," "above," or "below" another component, this includes not only being placed "in front of," "behind," "above," or "below" the other component in direct contact with it, but also if there is another component intervening therebetween. Furthermore, when a component is said to be "connected" to another component, this includes not only being directly connected to one another, but also being indirectly connected to one another, unless there are special circumstances.

[0047] Hereinafter, a transformer core (100) according to an embodiment of the present invention will be described with reference to the drawings.

[0048] A transformer core (100) according to an embodiment of the present invention may include a body (110, 120) in which an inner wall (112a), an intermediate wall (122b), and an outer wall (112c, 122c) are formed from the center, a first wire is wound between the inner wall (112a) and the intermediate wall (122b), and a second wire is wound between the intermediate wall (122b) and the outer walls (112c, 122c), as shown in FIGS. 1 to 7.

[0049] A transformer core (100) according to an embodiment of the present invention may include a first body (110) and a second body (120).

[0050] Referring to FIGS. 1 to 7, the first body (110) may be formed by a portion of the inner wall (112a) and the outer wall (112c) protruding from the base (111).

[0051] At this time, the entire inner wall (112a) is formed in the first body (110), a part of the outer wall (112c) is formed, and an intermediate wall such as an intermediate wall (122b) formed in the second body (120) is not formed between the inner wall (112a) and the outer wall (112c).

[0052] At this time, the outer wall (112c) of the first body (110) and the outer wall (122c) of the second body (120) may be formed so that a portion thereof forms a right angle.

[0053] That is, the outer wall (112c) formed on the first body (110) may have a portion that is perpendicular to the longitudinal direction, and the outer wall (122c) formed on the second body (120) may have a portion that is parallel to the longitudinal direction. Of course, when the first body (110) and the second body (120) are combined, the respective outer walls (112c, 122c) may be in close contact with each other to form a single outer wall (112c, 122c).

[0054] That is, as illustrated in FIG. 3, at least one end of the longitudinal end of the outer wall (112c) formed on the first body (110) can be in contact with and in close contact with the end of the outer wall (122c) formed on the second body (120), thereby forming one outer wall (112c, 122c).

[0055] Referring to FIGS. 3 to 7, the second body (120) is formed by the intermediate wall (122b) protruding from the base (121) in a predetermined direction (from the upper side to the lower side in FIG. 3) and the remaining part (122c) of the outer wall (112c, 122c), and can be combined to be covered by the first body (110).

[0056] Specifically, an intermediate wall (122b) may be formed protrudingly in the central portion of the second body (120), and an outer wall (122c) may be formed protrudingly on the outer side of the intermediate wall (122b).

[0057] The outer walls (122c) formed on the second body (120) may be provided in pairs and may be arranged parallel to each other on both sides of the middle wall (122b).

[0058] In other words, a pair of outer walls (122c) formed on the second body (120) can be arranged in parallel.

[0059] Here, as described above, a first wire can be wound between the inner wall (112a) formed in the first body (110) and the intermediate wall (122b) formed in the second body (120), and a second wire can be wound between the intermediate wall (122b) and the outer walls (112c, 122c) formed in the first body (110) and the second body (120).

[0060] At this time, the outer wall (122c) formed on the second body (120) may be formed such that a portion of the outer walls (112c, 122c) is parallel along the longitudinal direction on a plane.

[0061] Referring to Fig. 4, a pair of outer walls (122c) formed on the second body (120) are provided and can be placed on both sides based on the middle wall (122b).

[0062] That is, since a pair of outer walls (122c) formed on the second body (120) are arranged on both sides of the intermediate wall (122b), no outer walls are formed on the front and rear sides of the intermediate wall (122b), and the intermediate wall (122b) can be milled without interference from the outer walls with the front and rear direction as the milling direction (M).

[0063] From another perspective, a pair of outer walls (122c) formed on the second body (120) can be formed parallel to the milling processing direction (M).

[0064] In addition, when the first body (110) and the second body (120) are combined to form a transformer core (100), an outer wall (112c) formed on the first body (110) may be placed on the front and rear sides of the middle wall (122b) formed on the second body (120).

[0065] In the present invention, a pair of outer walls (112c) formed on the first body (110) are arranged on the front and rear sides based on the middle wall (122b), and a pair of outer walls (122c) formed on the second body (120) are arranged on both sides based on the middle wall (122b), but this is not limited to the first body (110) and various modifications are possible, such as a pair of outer walls (112c) formed on the first body (110) are arranged on both sides based on the middle wall (122b), and a pair of outer walls (122c) formed on the second body (120) are arranged on the front and rear sides based on the middle wall (122b).

[0066] At this time, the inner wall (112a), the middle wall (122b), and the outer wall (112c, 122c) of the transformer core (100) in which the first and second bodies (110, 120) are combined may be formed in the shape of a rectangular parallelepiped or cylinder with curved edges on a plane.

[0067] Specifically, when the first body (110) and the second body (120) are combined, the inner surface of the corner of the outer wall (112c, 122c) can be formed into a curved surface. At this time, among the inner wall (112a), the middle wall (122b), and the outer wall (112c, 122c), the inner wall (112a) can be formed to have the thickest thickness.

[0068] At this time, an entrance (112d, 122d) through which the first wire and the second wire enter and exit may be formed by partially cutting the outer wall (112c, 122c) and the middle wall (122b).

[0069] At this time, the entrance (112d, 122d) can be formed in the same direction on the outer wall (112c, 122c) and the middle wall (122b).

[0070] At this time, the widths of the entrances (112d, 122d) formed in the first body (110) and the second body (120) can be formed to be the same.

[0071] Referring to FIG. 3, the outer surface of the inner wall (112a) facing the entrance (112d) according to one embodiment of the present invention may be formed into a curved surface. This has the effect of enabling smooth movement of the first wire surrounding the inner wall.

[0072] Referring to FIG. 3, an exploded perspective view of a transformer core (100) according to one embodiment of the present invention is shown.

[0073] The body (110, 120) of the transformer core (100) according to one embodiment of the present invention can be completed by combining the first body (110) and the second body (120) with each other as shown in FIG. 3.

[0074] The first body (110) has the entire inner wall (112a) and part of the outer wall (112c) formed on the base (111), and the second body (120) has the entire middle wall (122b) and part of the outer wall (122c) formed on the base (121).

[0075] The first body (110) and the second body (120) can be combined with the base (111, 121) positioned on the outside.

[0076] Specifically, each base (111, 121) of the first body (110) and the second body (120) can be placed facing each other so that an outer wall (112c, 122c), an inner wall (112a), and an intermediate wall (122b) are placed therebetween.

[0077] At this time, the partition walls (112a, 122b, 112c, 122c) formed in each body (110, 120) are formed so as not to overlap each other, so that when they are combined with each other, the ends of the partition walls of each body (110, 120) can be in close contact with the base (111, 121) of the opposite body (110, 120) and come into surface contact.

[0078] That is, when combined, the end of the inner wall (112a) of the first body (110) can be in close contact with the base (121) of the second body (120), and the end of the middle wall (122b) of the second body (120) can be in close contact with the base (111) of the first body (110).

[0079] In addition, when combined, the outer wall (112c) end of the first body (110) and the outer wall (122c) end of the second body (120) can be brought into close contact with each other's opposite bases (111, 121), and the side ends of the outer walls (112c, 122c) can also be brought into close contact with each other when combined.

[0080] By combining the first body (110) and the second body (120) in this way, the bases (111, 121) are placed above and below each other, and an inner wall (112a), an outer wall (112c, 122c), and an intermediate wall (122b) are formed between them. As described above, a first wire and a second wire can be wound between each of the partition walls, and as a result, a transformer core (100) can be completed.

[0081] Of course, entrances (112d, 122d) can be formed in the middle wall (122b) and the outer wall (112c) so that the first wire and the second wire can come out to the outside.

[0082] In addition, according to one embodiment of the present invention, the outer wall (112c) of the first body (111) includes a first outer wall having a first upper side (A1), a second outer wall having a second upper side (A2), and a third outer wall having a third upper side (A3).

[0083] The first upper side surface (A1), the second upper side surface (A2), and the third upper side surface (A3) provided on the first outer wall, the second outer wall, and the third outer wall, respectively, can be formed to have the same area along the height direction.

[0084] At this time, the first surface (A) of the outer wall (112c) of the first body (111) includes the first upper surface (A1), the second upper surface (A2), and the third upper surface (A3).

[0085] And, the area of ​​the first surface (A) of the outer wall (112c) of the first body (111) is defined as the first area. And, the first area is equal to the sum of the area of ​​the first upper surface (A1), the area of ​​the second upper surface (A2), and the area of ​​the third upper surface (A3).

[0086] And, the outer wall (112c) of the second body (121) includes a fourth outer wall having a fourth upper side surface (B1), a fifth outer wall having a fifth upper side surface (B2), and a sixth outer wall having a sixth upper side surface (B3).

[0087] At this time, the second surface (B) of the outer wall (122c) of the second body (121) includes the fourth upper surface (B1), the fifth upper surface (B2), and the sixth upper surface (B3).

[0088] And, the area of ​​the second surface (B) of the outer wall (122c) of the second body (121) is defined as the second area. And, the second area is equal to the sum of the area of ​​the fourth upper surface (B1), the area of ​​the fifth upper surface (B2), and the area of ​​the sixth upper surface (B3).

[0089] And, the area of ​​the third surface (C) of the above intermediate wall (122b) is defined as the third area.

[0090] And, the area of ​​the fourth surface (D) of the inner wall (112a) is defined as the fourth area.

[0091] At this time, the sum of the first area, the second area, and the third area is greater than the fourth area.

[0092] Accordingly, the transformer core (100) according to one embodiment of the present invention improves the efficiency of the transformer by controlling the leakage inductance as the sum of the first area, the second area, and the third area becomes larger than the fourth area.

[0093] In addition, the edge (112e) of the outer wall (112c) of the first body (110) is in contact with the edge (122e) of the outer wall (122c) of the second body (120). Accordingly, the outer wall (112c) of the first body (110) and the outer wall (122c) of the second body (120) are electromagnetically connected to each other, thereby preventing the characteristics of the transformer from changing.

[0094] Referring to FIG. 4, a perspective view of a second body (120), which is a component of a transformer core according to one embodiment of the present invention, is illustrated.

[0095] It is shown that both the first body (110) and the second body (120) are in a form that allows milling processing.

[0096] Referring to FIG. 3, in the case of the first body (110), milling processing is sufficiently possible because the space between the inner wall (112a) and the outer wall (112c) is wide.

[0097] Specifically, the outer wall (112c) formed on the first body (110) is provided in a pair and can be arranged parallel to the front and rear sides of the inner wall (112a) based on the milling processing direction (M) illustrated in FIG. 4.

[0098] That is, an open space is formed on both sides of the inner wall (112a) based on the milling processing direction (M), and milling processing of the inner wall (112a) is possible along a direction perpendicular to the milling processing direction (M).

[0099] Referring to FIG. 4, in the case of the second body (120), the outer wall (122c) is open with respect to the milling direction (M), and the outer wall (122c) and the middle wall (122b) are formed in a form that is approximately parallel to each other along the length direction, so it is shown that milling is possible along the milling direction (M).

[0100] That is, a part of the intermediate wall (122b) is formed parallel to a part of the outer wall (122c) of the second body (120).

[0101] Conversely, in conventional milling processes, not only is the space between the bulkheads narrow, but even if the tool blade can be inserted between the bulkheads, there are many areas where it gets caught on the outer wall, making milling impossible or inefficient, necessitating the selection of other processing methods. Figure 4 demonstrates that such milling is now possible.

[0102] Additionally, the outer wall (122c) and the middle wall (122b) of the second body (120) are formed to protrude from the base (121).

[0103] And, the height at which the intermediate wall (122b) protrudes from the base (121) is defined as the first height (H1). And, the height at which the outer wall (122c) of the second body (120) protrudes from the base (121) is defined as the second height (H2).

[0104] At this time, the first height (H1) is relatively lower than the second height (H2). Accordingly, according to one embodiment of the present invention, the transformer core improves the efficiency of the transformer by controlling the leakage inductance as the first height (H1) becomes lower than the second height (H2).

[0105] Meanwhile, the space formed between the third surface (C) of the intermediate wall (122b) and the intermediate wall (122b) determines the main inductance and leakage inductance.

[0106] And, since the first height (H1) is formed relatively lower than the second height (H2), when the third area (C, see FIG. 3) of the middle wall (122b) is made wider, there is an advantage in that the fourth area (D, see FIG. 3) of the inner wall (112a, see FIG. 3) can be designed narrower.

[0107] In addition, when the third area (C, see FIG. 3) of the intermediate wall (122b) is made wider, there is an advantage of generating the necessary leakage inductance even if the space between the intermediate walls (122b) is made smaller.

[0108] Referring to FIG. 5, an operational diagram showing the direction of magnetic flux according to the current flow of the first wire of the transformer core (100) according to one embodiment of the present invention is illustrated. The perspective view of (a) shows a state in which the base (111, 121) is removed, and the drawing of (b) shows a cross-section. When the first wire between the inner wall (112a) and the middle wall (122b) rotates counterclockwise around the inner wall (112a), the magnetic flux of the inner wall (112a) is directed upward, and the magnetic flux of the middle wall (122b) and the outer walls (112c, 122c) is directed downward.

[0109] Referring to FIG. 6, an operational diagram showing the direction of magnetic flux according to the current flow of the second wire of the transformer core (100) according to one embodiment of the present invention is illustrated.

[0110] As a drawing similar to FIG. 5, when the second wire between the middle wall (122b) and the outer walls (112c, 122c) rotates counterclockwise around the middle wall (122b), the magnetic flux is directed upwards at the inner wall (112a) and the middle wall (122b), and downwards at the outer walls (112c, 122c).

[0111] Referring to FIG. 7, an operating diagram showing the direction of magnetic flux according to the current flow of both the first and second wires of the transformer core (100) according to one embodiment of the present invention is illustrated.

[0112] When the first wire rotates counterclockwise around the inner wall (112a) and the second wire rotates counterclockwise around the middle wall (122b), the magnetic flux of the middle wall (122b) is canceled out, creating leakage inductance. At this time, the size of the leakage inductance can be determined depending on the gap of the middle wall (122b).

[0113] Referring to FIGS. 8 and 9, an example of a circuit diagram to which a transformer core (100) according to one embodiment of the present invention can be applied is illustrated. Such leakage inductance can be used in an LLC inductance or an inverter utilizing a transformer and inductance. Here, FIG. 8 shows an equivalent circuit of an LLC resonant converter and a transformer, and FIG. 9 shows that it can be applied to a dual active bridge converter.

[0114] Although not shown in the drawing, the solar power system may include a solar module and a gateway. The solar module may include a solar cell module and a power converter (not shown) that converts direct current from the solar cell module into alternating current and outputs it.

[0115] A transformer core according to one embodiment of the present invention is provided in a power conversion device. As the specific configuration of the gateway and the power conversion device is known, a detailed description thereof will be omitted.

[0116] Although the embodiments of the present invention have been described, the spirit of the present invention is not limited to the embodiments presented in this specification, and those skilled in the art who understand the spirit of the present invention will be able to easily propose other embodiments by adding, changing, deleting, or adding components within the scope of the same spirit, but this will also be considered to fall within the spirit of the present invention.

[0117] According to the present invention, a transformer core, a power conversion device including the transformer core, and a solar module including the same are provided. Furthermore, embodiments of the present invention can be applied to solar power systems capable of generating solar power for industrial use.

Claims

1. A transformer core including a body in which an inner wall, a middle wall, and an outer wall are formed from the center, a first wire is wound between the inner wall and the middle wall, and a second wire is wound between the middle wall and the outer wall. A first body formed with the inner wall and a portion of the outer wall protruding from the base; and A second body formed by protruding from the base the middle wall and the remaining part of the outer wall, and combined to be covered by the first body; A transformer core, including:

2. In paragraph 1, The area of ​​the first surface of the outer wall of the first body is defined as the first area, The area of ​​the second surface of the outer wall of the second body is defined as the second area, The area of ​​the third surface of the above intermediate wall is defined as the third area, The area of ​​the fourth side of the inner wall is defined as the fourth area, A transformer core, wherein the sum of the first area, the second area, and the third area is relatively larger than the fourth area.

3. In paragraph 1, The outer wall and the middle wall of the second body are formed to protrude from the base, The height at which the above intermediate wall protrudes from the base is defined as the first height, The height at which the outer wall of the second body protrudes from the base is defined as the second height, A transformer core, wherein the first height is relatively lower than the second height.

4. In paragraph 1, A transformer core, wherein a portion of the intermediate wall is formed parallel to a portion of the outer wall of the second body.

5. In paragraph 1, A transformer core having a pair of outer walls formed on the second body and arranged parallel to each other on both sides of the middle wall.

6. In paragraph 5, A transformer core, wherein a pair of outer walls formed on the first body are provided and are arranged parallel to the front and rear sides of the middle wall formed on the second body when the first body and the second body are combined.

7. In paragraph 1, A transformer core having a pair of outer walls formed on the second body and arranged parallel to the front and rear sides of the intermediate wall.

8. In paragraph 7, A transformer core, wherein a pair of outer walls formed on the first body are provided and are arranged parallel to both sides of the middle wall formed on the second body when the first body and the second body are combined.

9. In paragraph 1, A transformer core in which the inner wall is formed to be the thickest among the inner wall, middle wall, and outer wall.

10. In paragraph 1, A transformer core in which the heights of the outer walls formed on the first body and the second body are formed to be the same.

11. In paragraph 1, A transformer core, in which an entrance through which a first wire and a second wire enter and exit is formed by cutting a portion of the outer wall and the middle wall.

12. In paragraph 11, The above-mentioned entrance is formed in the same direction on the outer wall and the middle wall, the transformer core.

13. In paragraph 12, A transformer core in which the widths of the entrances and exits formed in the outer wall and the middle wall are formed to be the same.

14. In paragraph 11, A transformer core, wherein the outer surface of the inner wall facing the entrance is formed into a curved surface.

15. In paragraph 1, A transformer core, wherein an edge of the outer wall of the first body can come into contact with an edge of the outer wall of the second body.

16. In paragraph 1, A transformer core in which the inner surface of the corner of the outer wall is formed into a curved surface when the first body and the second body are combined.

17. In paragraph 1, A transformer core in which the outer wall of the first body and the outer wall of the second body are formed so that a portion thereof forms a right angle.

18. A power conversion device comprising a transformer core according to any one of claims 1 to 17.

19. In paragraph 18, A first wire wound between the inner wall and the middle wall formed in the transformer core; and A power conversion device further comprising a second wire wound between the middle wall and the outer wall formed in the transformer core.

20. A solar module comprising a power conversion device of Article 18.

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