Magnetic assembly

Abstract

The present invention relates to a magnetic assembly comprising a magnetic core, at least two sets of windings, and a magnetic coating. The magnetic core includes a magnetic core body and a hollow portion that penetrates the magnetic core body. At least two sets of windings are each wound around the magnetic core body, and each winding penetrates at least partially the hollow portion. At least a portion of the at least two sets of windings is located between a portion of the magnetic coating and the other portion of the magnetic coating.

Description

Technical Field

[0001] The present invention relates to the field of power electronics, and particularly to a magnetic assembly.

Background Art

[0002] Currently, the filter circuit in a power supply is used to suppress electromagnetic interference (EMI) generated during the switching of a switch. The filter circuit includes two stages of filter modules. The first-stage filter module includes a common-mode inductor (i.e., a common-mode magnetic component) and an X capacitor, and the second-stage filter module includes a differential-mode inductor (i.e., a differential-mode magnetic component) and a Y capacitor. And both stages of filter modules are mounted on the main circuit board together. Among these, the filter circuit realizes the function of suppressing differential-mode noise of electromagnetic interference by using a differential-mode inductor. However, since the filter circuit has a two-stage configuration including two magnetic components, its volume is large, the number of components is also large, leading to the enlargement of the entire power supply, and it is difficult to miniaturize. Therefore, developing a magnetic assembly to overcome the above drawbacks has become an urgent issue at present.

Summary of the Invention

[0003] The object of the present invention is to provide a magnetic assembly that improves leakage inductance and impedance during high-frequency applications by utilizing the placement of the magnetic coating, thereby suppressing differential mode noise, by arranging the first and second windings between a part of the magnetic coating and other parts of the magnetic coating. Furthermore, since the magnetic assembly of the present invention is a single component, it has a small volume and a small number of parts, and the volume of the power supply unit using the magnetic assembly of the present invention is also small, making it easy to achieve miniaturization, improve power density and power efficiency. In addition, the magnetic assembly of the present invention can have an open structure for the coating method composed of soft magnetic sheets by reducing the number of soft magnetic sheets and covering only two sides of the magnetic core body. This improves the heat dissipation capacity of the magnetic assembly and, consequently, can lower the overall temperature of the power supply unit using the magnetic assembly. To achieve the above objective, a magnetic assembly according to one embodiment of the present invention comprises a magnetic core, at least two sets of windings, and a magnetic coating. The magnetic core includes a magnetic core body and a hollow portion, the hollow portion penetrating the magnetic core body. At least two sets of windings are each wound around the magnetic core body, and each winding at least partially penetrates the hollow portion. At least a portion of the at least two sets of windings is located between a portion of the magnetic coating and the other portion of the magnetic coating. [Brief explanation of the drawing]

[0004] [Figure 1A] This is a conceptual diagram of the structure of a magnetic assembly according to the first embodiment of the present invention. [Figure 1B] Figure 1A is an exploded view of the magnetic assembly shown. [Figure 2A] This is a conceptual diagram of the structure of a magnetic assembly according to a second embodiment of the present invention. [Figure 2B] Figure 2A is an exploded view of the magnetic assembly shown. [Figure 3A] This is a conceptual diagram of the structure of a magnetic assembly according to the third embodiment of the present invention. [Figure 3B] Figure 3A is an exploded view of the magnetic assembly shown. [Figure 4A]This is a conceptual diagram of the structure of a magnetic assembly according to the fourth embodiment of the present invention. [Figure 4B] Figure 4A is an exploded view of the magnetic assembly shown. [Figure 5A] This is a conceptual diagram of the structure of a magnetic assembly according to the fifth embodiment of the present invention. [Figure 5B] Figure 5A is an exploded view of the magnetic assembly shown. [Figure 6A] This is a conceptual diagram of the structure of a magnetic assembly according to the sixth embodiment of the present invention. [Figure 6B] Figure 6A is an exploded view of the magnetic assembly shown. [Figure 7A] This is a conceptual diagram of the structure of a magnetic assembly according to the seventh embodiment of the present invention. [Figure 7B] Figure 7A is an exploded view of the magnetic assembly shown. [Figure 8A] This is a conceptual diagram of the structure of a magnetic assembly according to the eighth embodiment of the present invention. [Figure 8B] Figure 8A is an exploded view of the magnetic assembly shown. [Figure 9] This is an exploded view of a magnetic assembly according to the ninth embodiment of the present invention. [Figure 10A] This is a conceptual diagram of the structure of a magnetic assembly according to the 10th embodiment of the present invention. [Figure 10B] Figure 10A is an exploded view of the magnetic assembly shown. [Figure 11A] This is a conceptual diagram of the structure of a magnetic assembly according to the 11th embodiment of the present invention. [Figure 11B] Figure 11A is an exploded view of the magnetic assembly shown. [Figure 12A] This is a conceptual diagram of the structure of a magnetic assembly according to the 12th embodiment of the present invention. [Figure 12B] Figure 12A is an exploded view of the magnetic assembly shown. [Figure 13A] This is a conceptual diagram of the structure of a magnetic assembly according to the 13th embodiment of the present invention. [Figure 13B] Figure 13A is an exploded view of the magnetic assembly shown. [Figure 14A] This is a voltage-frequency waveform diagram of a conventional magnetic assembly. [Figure 14B]It is a voltage-frequency waveform diagram of the magnetic assembly of the present invention.

Explanation of Signs

[0005] 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i, 1j, 1k, 1m: Magnetic assembly 2: Magnetic core 21: Magnetic core body 211: First side pillar 212: Second side pillar 213: First connection pillar 214: Second connection pillar 21a: Outer annular surface 21b: Inner annular surface 21c: First side surface 21d: Second side surface 22: Hollow part 23: Gap 3: First winding 4: Second winding 5: Magnetic coating part 51: First soft magnetic sheet 52: Second soft magnetic sheet 53: Third soft magnetic sheet 54: Fourth soft magnetic sheet 55: First coating member 56: Second coating member [[ID=5२]]57: Opening 6: Fixing part 71: First interval 72: Second interval 8: Magnetic sheet 81: Separator 82: Protrusion 9: Pedestal 91: Bottom plate 92: Positioning member 93: First positioning groove 94: Second positioning groove

Embodiment for Carrying Out the Invention

[0006] Several typical embodiments that embody the features and advantages of the present invention will be described in detail below. The present invention can be modified in various ways in different embodiments, none of which will deviate from the scope of the invention. Furthermore, the description and drawings herein are for illustrative purposes only and should not be understood as limiting the invention.

[0007] Please refer to Figures 1A and 1B. Figure 1A is a conceptual structural diagram of a magnetic assembly according to the first embodiment of the present invention, and Figure 1B is an exploded view of the magnetic assembly shown in Figure 1A. As shown, the magnetic assembly 1 according to this embodiment comprises a magnetic core 2, a first winding 3, a second winding 4, and a magnetic coating portion 5. The magnetic core 2 includes a magnetic core body 21 and a hollow portion 22. As shown in Figure 1B, the magnetic core body 21 of this embodiment is a hollow rectangular body and includes a first side column 211, a second side column 212, a first connecting column 213, and a second connecting column 214. The first side column 211 and the second side column 212 are arranged opposite each other, and the first connecting column 213 and the second connecting column 214 are arranged opposite each other. Here, the first connecting column 213 is connected between the first end of the first side column 211 and the first end of the second side column 212, and the second connecting column 214 is connected between the second end of the first side column 211 and the second end of the second side column 212. The hollow portion 22 penetrates the magnetic core body 21, for example, through the center of the magnetic core body 21, and is located between the first side column 211 and the second side column 212, and between the first connecting column 213 and the second connecting column 214.

[0008] The first winding 3 is wound around a portion of the magnetic core body 21, for example, the first side column 211 of the magnetic core body 21, and a portion of the first winding 3 penetrates the hollow portion 22 and is located on one side of the magnetic core body 21. The second winding 4 is wound around another portion of the magnetic core body 21, for example, the second side column 212 of the magnetic core body 21, and a portion of the second winding 4 penetrates the hollow portion 22 and is located on the other side of the magnetic core body 21. In this embodiment, there is a gap 23 between the first winding 3 located in the hollow portion 22 and the second winding 4 located in the hollow portion 22.

[0009] The magnetic coating portion 5 may, but is not limited to, be composed of a foldable soft magnetic sheet or magnetic tape, and its thickness is less than 1.5 mm and it is an insulating material. In this embodiment, the magnetic coating portion 5 includes a first soft magnetic sheet 51, a second soft magnetic sheet 52, a third soft magnetic sheet 53, and a fourth soft magnetic sheet 54, the first soft magnetic sheet 51 and the second soft magnetic sheet 52 being arranged opposite each other, the third soft magnetic sheet 53 and the fourth soft magnetic sheet 54 being arranged opposite each other and positioned between the first soft magnetic sheet 51 and the second soft magnetic sheet 52. Here, the first soft magnetic sheet 51, the second soft magnetic sheet 52, the third soft magnetic sheet 53, and the fourth soft magnetic sheet 54 are integrally molded. The first soft magnetic sheet 51, third soft magnetic sheet 53, second soft magnetic sheet 52, and fourth soft magnetic sheet 54 of the magnetic coating portion 5 cover and adhere closely to (attach) the first winding 3 and the second winding 4, and surround the first side pillar 211 and the second side pillar 212 of the magnetic core body 21. Here, the first winding 3 is located between the first side pillar 211 of the magnetic core body 21 and the first soft magnetic sheet 51 of the magnetic coating portion 5, between the first side pillar 211 of the magnetic core body 21 and the second soft magnetic sheet 52 of the magnetic coating portion 5, and between the first side pillar 211 of the magnetic core body 21 and the third soft magnetic sheet 53 of the magnetic coating portion 5. The second winding 4 is located between the second side column 212 of the magnetic core body 21 and the first soft magnetic sheet 51 of the magnetic coating 5, between the second side column 212 of the magnetic core body 21 and the second soft magnetic sheet 52 of the magnetic coating 5, and between the second side column 212 of the magnetic core body 21 and the fourth soft magnetic sheet 54 of the magnetic coating 5. In this embodiment, the first winding 3 is located between the third soft magnetic sheet 53 of the magnetic coating 5 and the second winding 4, and the second winding 4 is located between the fourth soft magnetic sheet 54 of the magnetic coating 5 and the first winding 3. Also in this embodiment, the first soft magnetic sheet 51, the second soft magnetic sheet 52, the third soft magnetic sheet 53, and the fourth soft magnetic sheet 54 of the magnetic coating 5 do not penetrate the hollow portion 22, nor do they penetrate the gap 23 between the first winding 3 and the second winding 4.In this embodiment, the permeability of the magnetic coating portion 5, the number of layers in the internal structure, the cross-sectional area, and the number of turns are related to the leakage inductance of the magnetic assembly 1, and the leakage inductance of the entire magnetic assembly 1 can be adjusted by changing the permeability of the magnetic coating portion 5, the number of layers in the internal structure, the cross-sectional area, and the number of turns. In one embodiment, the magnetic assembly 1 is provided with a fixing bracket (not shown) for fixing the magnetic core 2, for example, the second connecting column 214 of the magnetic core body 21 of the magnetic core 2 is installed on the fixing bracket, and the magnetic core 2 is fixed on the fixing bracket.

[0010] As can be seen from the above, the magnetic assembly 1 of the present invention, by positioning the first winding 3 and the second winding 4 between a part of the magnetic coating 5 and the other part of the magnetic coating 5, can improve leakage inductance and impedance during high-frequency applications by utilizing the placement of the magnetic coating 5, thereby realizing a differential mode noise suppression function. Compared with conventional filter circuits, which can only achieve differential mode noise suppression using two magnetic components (common mode magnetic component and differential mode magnetic component), the magnetic assembly 1 of the present invention is a single component, so it has a small volume and fewer parts, and the volume of a power supply that applies the magnetic assembly 1 of the present invention is also small, making it easier to miniaturize, improve power density and power efficiency.

[0011] In some embodiments, the manner in which the magnetic coating portion 5 covers the first winding 3 and the second winding 4 is adjustable. Refer to Figures 2A and 2B. Figure 2A is a conceptual structural diagram of a magnetic assembly according to a second embodiment of the present invention, and Figure 2B is an exploded view of the magnetic assembly shown in Figure 2A. As shown, compared to the magnetic assembly 1 shown in Figures 1A and 1B, the magnetic coating portion 5 of the magnetic assembly 1a of this embodiment has its third soft magnetic sheet 53, first soft magnetic sheet 51, fourth soft magnetic sheet 54 and second soft magnetic sheet 52 surrounding the first side column 211, first connecting column 213, second side column 212 and second connecting column 214. Here, the first winding 3 is located between the first side column 211 of the magnetic core body 21 and the third soft magnetic sheet 53 of the magnetic coating portion 5, and the second winding 4 is located between the second side column 212 of the magnetic core body 21 and the fourth soft magnetic sheet 54 of the magnetic coating portion 5. Furthermore, in this embodiment, the first winding 3 is located between the third soft magnetic sheet 53 of the magnetic coating portion 5 and the second winding 4, and the second winding 4 is located between the fourth soft magnetic sheet 54 of the magnetic coating portion 5 and the first winding 3.

[0012] Please refer to Figures 3A and 3B. Figure 3A is a conceptual structural diagram of a magnetic assembly according to a third embodiment of the present invention, and Figure 3B is an exploded view of the magnetic assembly shown in Figure 3A. As shown, compared to the magnetic assembly 1 shown in Figures 1A and 1B, the magnetic coating portion 5 of the magnetic assembly 1b of this embodiment has its first soft magnetic sheet 51, third soft magnetic sheet 53, second soft magnetic sheet 52, and fourth soft magnetic sheet 54 surrounding the first connecting column 213 and the second connecting column 214. Here, the first winding 3 is located between the first side column 211 of the magnetic core body 21 and the first soft magnetic sheet 51 of the magnetic coating portion 5, and between the first side column 211 of the magnetic core body 21 and the second soft magnetic sheet 52 of the magnetic coating portion 5. The second winding 4 is located between the second side column 212 of the magnetic core body 21 and the first soft magnetic sheet 51 of the magnetic coating 5, and between the second side column 212 of the magnetic core body 21 and the second soft magnetic sheet 52 of the magnetic coating 5. In this embodiment, the first winding 3 and the second winding 4 are located between the third soft magnetic sheet 53 and the fourth soft magnetic sheet 54 of the magnetic coating 5, respectively.

[0013] Please refer to Figures 4A and 4B. Figure 4A is a conceptual structural diagram of a magnetic assembly according to a fourth embodiment of the present invention, and Figure 4B is an exploded view of the magnetic assembly shown in Figure 4A. As shown, compared to the magnetic assembly 1 shown in Figures 1A and 1B, the magnetic coating portion 5 of the magnetic assembly 1c of this embodiment includes a first coating member 55 and a second coating member 56. The first coating member 55 surrounds the first side column 211 of the magnetic core body 21, and the first winding 3 is located between the first side column 211 of the magnetic core body 21 and the first coating member 55 of the magnetic coating portion 5. The second coating member 56 surrounds the second side column 212 of the magnetic core body 21, and the second winding 4 is located between the second side column 212 of the magnetic core body 21 and the second coating member 56 of the magnetic coating portion 5. In this embodiment, at least a portion of the first covering member 55 and at least a portion of the second covering member 56 each penetrate the hollow portion 22 and also penetrate the gap 23 between the first winding 3 and the second winding 4.

[0014] Please refer to Figures 5A and 5B. Figure 5A is a conceptual structural diagram of a magnetic assembly according to the fifth embodiment of the present invention, and Figure 5B is an exploded view of the magnetic assembly shown in Figure 5A. As shown, compared to the magnetic core body 21 of the magnetic core 2 of the magnetic assembly 1 shown in Figures 1A and 1B, which is a hollow rectangular body, the magnetic core body 21 of the magnetic core 2 of the magnetic assembly 1d of this embodiment is an annular member. The first winding 3 is wound around a part of the magnetic core body 21, and a part of the first winding 3 penetrates the hollow portion 22. The second winding 4 is wound around another part of the magnetic core body 21, and a part of the second winding 4 penetrates the hollow portion 22. The first winding 3 and the second winding 4 are located on opposite sides of the magnetic core body 21 of the magnetic core 2 and do not come into contact with each other. Here, the first end 31 of the first winding 3 is located on the first side of the magnetic core body 21, the first end 41 of the second winding 4 is located on the first side of the magnetic core body 21, and there is a first gap 71 between the first end 31 of the first winding 3 and the first end 41 of the second winding 4. The second end 32 of the first winding 3 is located on the second side of the magnetic core body 21, the second end 42 of the second winding 4 is located on the second side of the magnetic core body 21, and there is a second gap 72 between the second end 32 of the first winding 3 and the second end 42 of the second winding 4.

[0015] In this embodiment, the magnetic core body 21 of the magnetic core 2 includes an outer annular surface 21a, an inner annular surface 21b, a first side surface 21c, and a second side surface 21d. The outer annular surface 21a surrounds the inner annular surface 21b, and the space surrounded by the inner annular surface 21b forms a hollow portion 22. The first side surface 21c and the second side surface 21d are arranged opposite each other and are connected between the outer annular surface 21a and the inner annular surface 21b, respectively. The first soft magnetic sheet 51, the third soft magnetic sheet 53, the second soft magnetic sheet 52, and the fourth soft magnetic sheet 54 of the magnetic coating portion 5 surround a portion of the outer annular surface 21a, the first side surface 21c, and the second side surface 21d of the magnetic core body 21. In this embodiment, the first spacing 71 and the second spacing 72 are exposed to the outside of the magnetic assembly 1d through two openings 57 on both sides of the magnetic coating portion 5, respectively.

[0016] In some embodiments, the manner in which the magnetic coating portion 5 covers the first winding 3 and the second winding 4 is adjustable. See Figures 6A and 6B. Figure 6A is a conceptual structural diagram of a magnetic assembly according to the sixth embodiment of the present invention, and Figure 6B is an exploded view of the magnetic assembly shown in Figure 6A. As shown, compared to the magnetic assembly 1d shown in Figures 5A and 5B, the first and second spacings 71 and 72 of the magnetic assembly 1e of this embodiment are covered by the magnetic coating portion 5 and are not exposed to the outside of the magnetic assembly 1e. On the other hand, the first winding 3 and the second winding 4 are exposed to the outside of the magnetic assembly 1e through two openings 57 on both sides of the magnetic coating portion 5.

[0017] Please refer to Figures 7A and 7B. Figure 7A is a conceptual structural diagram of a magnetic assembly according to the seventh embodiment of the present invention, and Figure 7B is an exploded view of the magnetic assembly shown in Figure 7A. As shown, compared to the magnetic assembly 1d shown in Figures 5A and 5B, the magnetic coating portion 5 of the magnetic assembly 1f of this embodiment has its first soft magnetic sheet 51, third soft magnetic sheet 53, second soft magnetic sheet 52, and fourth soft magnetic sheet 54 surrounding the outer annular surface 21a of the magnetic core body 21. Here, a part of the first winding 3 is located between the outer annular surface 21a of the magnetic core body 21 and the first soft magnetic sheet 51 of the magnetic coating portion 5, and a part of the second winding 4 is located between the outer annular surface 21a of the magnetic core body 21 and the second soft magnetic sheet 52 of the magnetic coating portion 5. Furthermore, in this embodiment, the first winding 3 is located between the first soft magnetic sheet 51 and the second winding 4 of the magnetic coating portion 5, and the second winding 4 is located between the second soft magnetic sheet 52 and the first winding 3 of the magnetic coating portion 5.

[0018] Please refer to Figures 8A and 8B. Figure 8A is a conceptual structural diagram of a magnetic assembly according to the eighth embodiment of the present invention, and Figure 8B is an exploded view of the magnetic assembly shown in Figure 8A. As shown, compared to the magnetic assembly 1d shown in Figures 5A and 5B, the magnetic coating portion 5 of the magnetic assembly 1g of this embodiment includes a first coating member 55 and a second coating member 56. The first coating member 55 surrounds the first winding 3, and the first winding 3 is located between the magnetic core body 21 and the first coating member 55 of the magnetic coating portion 5. The second coating member 56 surrounds the second winding 4, and the second winding 4 is located between the magnetic core body 21 and the second coating member 56 of the magnetic coating portion 5. In this embodiment, at least a portion of the first coating member 55 and at least a portion of the second coating member 56 penetrate the hollow portion 22.

[0019] Please refer to Figure 9. Figure 9 is an exploded view of a magnetic assembly according to the ninth embodiment of the present invention. As shown, compared to the magnetic assembly 1e shown in Figures 6A and 6B, the magnetic assembly 1h of this embodiment further comprises a magnetic sheet 8 and a base 9. The magnetic sheet 8 is installed in the hollow portion 22 of the magnetic core 2 and includes a separator 81 and a projection 82. The extension direction of the separator 81 is from the first interval 71 toward the second interval 72. The projection 82 is configured to extend from the surface of the separator 81 in a direction perpendicular to the separator 81. The base 9 includes a bottom plate 91 and a plurality of positioning members 92. Each of the plurality of positioning members 92 extends from the surface of the bottom plate 91 in a direction perpendicular to the bottom plate 91, and the plurality of positioning members 92 jointly define a first positioning groove 93 and a second positioning groove 94. Here, the first positioning groove 93 corresponds to the separator 81 of the magnetic sheet 8, and the second positioning groove 94 corresponds to the protrusion 82 of the magnetic sheet 8. The separator 81 of the magnetic sheet 8 is placed in the first positioning groove 93, and the protrusion 82 of the magnetic sheet 8 is placed in the second positioning groove 94. The magnetic sheet 8 is fitted between the multiple positioning members 92 using the separator 81 and the protrusion 82 and connected to the base 9.

[0020] In some embodiments, the number of soft magnetic sheets in the magnetic coating can be adjusted to improve heat dissipation. See Figures 10A and 10B. Figure 10A is a conceptual structural diagram of a magnetic assembly according to a 10th embodiment of the present invention, and Figure 10B is an exploded view of the magnetic assembly shown in Figure 10A. As shown, compared to the magnetic assembly 1d shown in Figures 5A and 5B, which includes four soft magnetic sheets, the magnetic coating 5 of the magnetic assembly 1i of this embodiment includes only two soft magnetic sheets, namely a first soft magnetic sheet 51 and a second soft magnetic sheet 52. The first soft magnetic sheet 51 and the second soft magnetic sheet 52 are arranged opposite each other, with the first soft magnetic sheet 51 covering the first side surface 21c of the magnetic core body 21 and the second soft magnetic sheet 52 covering the second side surface 21d of the magnetic core body 21. In this embodiment, the first winding 3 and the second winding 4 are located between the first soft magnetic sheet 51 and the second soft magnetic sheet 52, respectively. Furthermore, in this embodiment, the magnetic assembly 1i further includes a fixing part 6, which is arranged to surround the outside of the first soft magnetic sheet 51 and the outside of the second soft magnetic sheet 52, and fixes the first soft magnetic sheet 51 and the second soft magnetic sheet 52 to each other on the magnetic core body 21 of the magnetic core 2. In this embodiment, the number of soft magnetic sheets is reduced and only two sides of the magnetic core body 21 are covered, so the covering method of the magnetic assembly 1i composed of soft magnetic sheets in this embodiment is an open structure. Therefore, the heat dissipation capacity of the magnetic assembly 1i is excellent, and consequently the overall temperature of the power supply unit using the magnetic assembly 1i can be reduced. In this embodiment, the fixing part 6 is an adhesive material, such as tape, but is not limited thereto.

[0021] Please refer to Figures 11A and 11B. Figure 11A is a conceptual structural diagram of a magnetic assembly according to the 11th embodiment of the present invention, and Figure 11B is an exploded view of the magnetic assembly shown in Figure 11A. As shown, compared to the magnetic assembly 1i shown in Figures 10A and 10B, the magnetic assembly 1j of this embodiment further includes a third soft magnetic sheet 53, which is connected between one end of the first soft magnetic sheet 51 and one end of the second soft magnetic sheet 52. In this embodiment, the fixing part 6 is arranged to surround the outside of the first soft magnetic sheet 51, the outside of the third soft magnetic sheet 53, and the outside of the second soft magnetic sheet 52, fixing the first soft magnetic sheet 51, the third soft magnetic sheet 53, and the second soft magnetic sheet 52 to each other on the magnetic core body 21 of the magnetic core 2.

[0022] Of course, the installation position of the soft magnetic sheets can also be adjusted according to the requirements. Please refer to Figures 12A and 12B. Figure 12A is a conceptual structural diagram of a magnetic assembly according to the 12th embodiment of the present invention, and Figure 12B is an exploded view of the magnetic assembly shown in Figure 12A. As shown, compared to the magnetic assembly 1d shown in Figures 5A and 5B, which includes four soft magnetic sheets, the magnetic coating portion 5 of the magnetic assembly 1k of this embodiment includes only two soft magnetic sheets, namely the first soft magnetic sheet 51 and the second soft magnetic sheet 52. The first soft magnetic sheet 51 and the second soft magnetic sheet 52 are arranged opposite each other, and here the first soft magnetic sheet 51 and the second soft magnetic sheet 52 each cover both sides of the outer annular surface 21a of the magnetic core body 21. In this embodiment, the first winding 3 is located between the second winding 4 and the first soft magnetic sheet 51, and the second winding 4 is located between the first winding 3 and the second soft magnetic sheet 52. Furthermore, in this embodiment, the magnetic assembly 1k further includes a fixing portion 6, which is arranged to surround the outside of the first soft magnetic sheet 51 and the outside of the second soft magnetic sheet 52, and fixes the first soft magnetic sheet 51 and the second soft magnetic sheet 52 to each other on the magnetic core body 21 of the magnetic core 2.

[0023] Please refer to Figures 13A and 13B. Figure 13A is a conceptual diagram of the structure of a magnetic assembly according to the thirteenth embodiment of the present invention, and Figure 13B is an exploded view of the magnetic assembly shown in Figure 13A. As shown, compared to the magnetic assembly 1k shown in Figures 12A and 12B, the magnetic assembly 1m of this embodiment further includes a third soft magnetic sheet 53, the third soft magnetic sheet 53 is connected between one end of the first soft magnetic sheet 51 and one end of the second soft magnetic sheet 52, and the third soft magnetic sheet 53 has an arc-shaped structure.

[0024] Please refer to Figures 14A and 14B. Figure 14A is a voltage-frequency waveform diagram of a conventional magnetic assembly, and Figure 14B is a voltage-frequency waveform diagram of the magnetic assembly of the present invention. As can be seen from the waveform diagrams, the conventional magnetic assembly has high noise at low frequencies, for example, as shown in Figure 14A, the maximum noise reaches 78 dBuV. On the other hand, the magnetic assembly of the present invention has low noise at low frequencies, for example, as shown in Figure 14B, the maximum noise is only 70 dBuV, demonstrating that the structural design of the magnetic assembly of the present invention can achieve noise suppression.

[0025] As described above, the magnetic assembly of the present invention, by arranging the first and second windings between a part of the magnetic coating and other parts of the magnetic coating, can improve leakage inductance and impedance during high-frequency applications by utilizing the placement of the magnetic coating, thereby achieving differential mode noise suppression. Furthermore, since the magnetic assembly of the present invention is a single component, it has a small volume and a small number of parts, and the volume of the power supply unit using the magnetic assembly of the present invention is also small, making it easy to achieve miniaturization, improve power density, and improve power efficiency. In addition, the magnetic assembly of the present invention can have an open structure for the coating method composed of soft magnetic sheets by reducing the number of soft magnetic sheets and covering only two sides of the magnetic core body. This improves the heat dissipation capacity of the magnetic assembly and, consequently, can lower the overall temperature of the power supply unit using the magnetic assembly.

Claims

1. A magnetic core having a magnetic core body and a hollow portion penetrating the magnetic core body, At least two sets of windings are wound around the magnetic core body, with at least a portion of them penetrating the hollow portion, A magnetic assembly comprising: a magnetic coating portion arranged to sandwich at least a portion of the at least two sets of windings.

2. The aforementioned at least two sets of windings include a first winding and a second winding, The first winding is wound around a part of the magnetic core body and is located on one side of the magnetic core body. The second winding is wound around a part of the magnetic core body and is located on the other side of the magnetic core body. The magnetic core body comprises a first side column, a second side column, a first connecting column, and a second connecting column. The first side column and the second side column are arranged opposite each other. The first connecting column and the second connecting column are arranged opposite each other and are connected between the first side column and the second side column, The hollow portion is located between the first side column and the second side column, and between the first connecting column and the second connecting column, The first winding is wrapped around the first side column, and a portion of the first winding penetrates the hollow portion. The magnetic assembly according to claim 1, characterized in that the second winding is wound around the second side column, and a portion of the second winding penetrates the hollow portion.

3. The magnetic coating portion includes a first soft magnetic sheet, a second soft magnetic sheet, a third soft magnetic sheet, and a fourth soft magnetic sheet. The first soft magnetic sheet and the second soft magnetic sheet are arranged facing each other. The third soft magnetic sheet and the fourth soft magnetic sheet are arranged facing each other and are located between the first soft magnetic sheet and the second soft magnetic sheet. The magnetic assembly according to claim 2, characterized in that the first soft magnetic sheet, the second soft magnetic sheet, the third soft magnetic sheet, and the fourth soft magnetic sheet are integrally molded.

4. The first soft magnetic sheet, the third soft magnetic sheet, the second soft magnetic sheet, and the fourth soft magnetic sheet of the magnetic coating portion surround the first side column and the second side column, The first winding is located between the first side column and the first soft magnetic sheet of the magnetic coating, between the first side column and the second soft magnetic sheet of the magnetic coating, and between the first side column and the third soft magnetic sheet of the magnetic coating. The second winding is located between the second side column and the first soft magnetic sheet of the magnetic coating, between the second side column and the second soft magnetic sheet of the magnetic coating, and between the second side column and the fourth soft magnetic sheet of the magnetic coating, and the first winding is located between the third soft magnetic sheet of the magnetic coating and the second winding, The magnetic assembly according to claim 3, characterized in that the second winding is located between the fourth soft magnetic sheet of the magnetic coating portion and the first winding, there is a gap between the first winding located in the hollow portion and the second winding located in the hollow portion, and the magnetic coating portion does not penetrate the gap.

5. The third soft magnetic sheet, the first soft magnetic sheet, the fourth soft magnetic sheet, and the second soft magnetic sheet of the magnetic coating portion surround the first side column, the first connecting column, the second side column, and the second connecting column. The first winding is located between the first side column and the third soft magnetic sheet of the magnetic coating portion. The second winding is located between the second side column and the fourth soft magnetic sheet of the magnetic coating, and the first winding is located between the third soft magnetic sheet of the magnetic coating and the second winding. The second winding is located between the fourth soft magnetic sheet of the magnetic coating portion and the first winding. The magnetic assembly according to claim 3, characterized in that there is a gap between the first winding located in the hollow portion and the second winding located in the hollow portion, and the magnetic coating portion does not penetrate the gap.

6. The first soft magnetic sheet, the third soft magnetic sheet, the second soft magnetic sheet, and the fourth soft magnetic sheet of the magnetic coating portion surround the first connecting column and the second connecting column, The first winding is located between the first side column and the first soft magnetic sheet of the magnetic coating, and between the first side column and the second soft magnetic sheet of the magnetic coating. The second winding is located between the second side column and the first soft magnetic sheet of the magnetic coating, and between the second side column and the second soft magnetic sheet of the magnetic coating, and the first winding and the second winding are each located between the first soft magnetic sheet of the magnetic coating and the second soft magnetic sheet of the magnetic coating, The magnetic assembly according to claim 3, characterized in that there is a gap between the first winding located in the hollow portion and the second winding located in the hollow portion, and the magnetic coating portion does not penetrate the gap.

7. The magnetic coating portion includes a first coating member and a second coating member. The first covering member surrounds the first side column, The first winding is located between the first side column and the first covering member. The second covering member surrounds the second side column, The second winding is located between the second side column and the second covering member. The magnetic assembly according to claim 2, characterized in that there is a gap between the first winding located in the hollow portion and the second winding located in the hollow portion, and at least a portion of the first covering member and at least a portion of the second covering member each penetrate the gap.

8. The aforementioned at least two sets of windings include a first winding and a second winding, The magnetic core body of the magnetic core is an annular member, The first winding is wound around a part of the magnetic core body, and a part of the first winding penetrates the hollow portion. The second winding is wound around another part of the magnetic core body, and a portion of the second winding penetrates the hollow portion. The first winding and the second winding are located on opposite sides of the magnetic core body and do not come into contact with each other. One first end of the first winding is located on the first side of the magnetic core body, and one first end of the second winding is located on the first side of the magnetic core body, and there is a first gap between the first end of the first winding and the first end of the second winding. The magnetic assembly according to claim 1, characterized in that one second end of the first winding is located on the second side of the magnetic core body, one second end of the second winding is located on the second side of the magnetic core body, and there is a second gap between the second end of the first winding and the second end of the second winding.

9. The magnetic coating portion includes a first soft magnetic sheet, a second soft magnetic sheet, a third soft magnetic sheet, and a fourth soft magnetic sheet. The first soft magnetic sheet and the second soft magnetic sheet are arranged facing each other. The third soft magnetic sheet and the fourth soft magnetic sheet are arranged facing each other and are located between the first soft magnetic sheet and the second soft magnetic sheet. The magnetic assembly according to claim 8, characterized in that the first soft magnetic sheet, the second soft magnetic sheet, the third soft magnetic sheet, and the fourth soft magnetic sheet are integrally molded.

10. The magnetic core body of the magnetic core includes an outer annular surface, an inner annular surface, a first side surface, and a second side surface. The outer annular surface surrounds the inner annular surface, The first side and the second side are arranged opposite each other and are connected between the outer annular surface and the inner annular surface, The first soft magnetic sheet, the third soft magnetic sheet, the second soft magnetic sheet, and the fourth soft magnetic sheet of the magnetic coating portion surround a part of the outer annular surface, the first side surface, and the second side surface. The magnetic assembly according to claim 9, characterized in that the first and second intervals are each exposed to the outside of the magnetic assembly through two openings in the magnetic coating portion, and the magnetic coating portion does not penetrate the hollow portion.

11. The magnetic core body of the magnetic core includes an outer annular surface, an inner annular surface, a first side surface, and a second side surface. The outer annular surface surrounds the inner annular surface, The first side and the second side are arranged opposite each other and are connected between the outer annular surface and the inner annular surface, The first soft magnetic sheet, the third soft magnetic sheet, the second soft magnetic sheet, and the fourth soft magnetic sheet of the magnetic coating portion surround a part of the outer annular surface, the first side surface, and the second side surface. The magnetic assembly according to claim 9, characterized in that the first winding and the second winding are each exposed to the outside of the magnetic assembly through two openings in the magnetic coating portion, and the magnetic coating portion does not penetrate the hollow portion.

12. The magnetic core body of the magnetic core includes an outer annular surface, an inner annular surface, a first side surface, and a second side surface. The outer annular surface surrounds the inner annular surface, The first side and the second side are arranged opposite each other and are connected between the outer annular surface and the inner annular surface, The first soft magnetic sheet, the third soft magnetic sheet, the second soft magnetic sheet, and the fourth soft magnetic sheet of the magnetic coating portion surround the outer annular surface, A portion of the first winding is located between the outer annular surface and the first soft magnetic sheet of the magnetic coating portion. A portion of the second winding is located between the outer annular surface and the second soft magnetic sheet of the magnetic coating portion. The first winding is located between the first soft magnetic sheet and the second winding of the magnetic coating portion. The second winding is located between the second soft magnetic sheet of the magnetic coating portion and the first winding. The magnetic assembly according to claim 9, characterized in that the magnetic coating portion does not penetrate the hollow portion.

13. The magnetic coating portion includes a first coating member and a second coating member. The first covering member surrounds the first winding, The first winding is located between the magnetic core body and the first covering member. The second covering member surrounds the second winding, The second winding is located between the magnetic core body and the second covering member. The magnetic assembly according to claim 8, characterized in that at least a portion of the first covering member and at least a portion of the second covering member each penetrate the hollow portion.

14. The magnetic assembly comprises a magnetic sheet and a base, The magnetic sheet is installed in the hollow portion and includes a separator and a protruding portion. The direction in which the separator extends is from the first interval toward the second interval. The aforementioned protrusion is configured to extend from the surface of the separator in a direction perpendicular to the separator, The base includes a base plate and a plurality of positioning members. Each of the aforementioned positioning members extends from the surface of the bottom plate in a direction perpendicular to the bottom plate, The aforementioned multiple positioning members jointly define a first positioning groove and a second positioning groove, The first positioning groove corresponds to the separator, The second positioning groove corresponds to the protrusion, The separator is installed in the first positioning groove, The magnetic assembly according to claim 8, characterized in that the protrusion is installed in the second positioning groove, and the magnetic sheet is fitted between the plurality of positioning members by the separator and the protrusion and connected to the base.

15. The magnetic coating portion includes a first soft magnetic sheet and a second soft magnetic sheet. The first soft magnetic sheet and the second soft magnetic sheet are arranged facing each other. The magnetic core body of the magnetic core includes an outer annular surface, an inner annular surface, a first side surface, and a second side surface. The outer annular surface surrounds the inner annular surface, The first side and the second side are arranged opposite each other and are connected between the outer annular surface and the inner annular surface, The first soft magnetic sheet and the second soft magnetic sheet of the magnetic coating portion cover the first side and the second side, respectively. The first winding and the second winding are located between the first soft magnetic sheet and the second soft magnetic sheet, respectively. The magnetic assembly further comprises a fixing portion, The magnetic assembly according to claim 8, characterized in that the fixing portion surrounds the outside of the first soft magnetic sheet and the outside of the second soft magnetic sheet so as to fix the first soft magnetic sheet and the second soft magnetic sheet to each other on the magnetic core body of the magnetic core.

16. The magnetic coating portion further includes a third soft magnetic sheet connected between one end of the first soft magnetic sheet and one end of the second soft magnetic sheet. The magnetic assembly according to claim 15, characterized in that the fixing portion surrounds the outside of the first soft magnetic sheet, the outside of the third soft magnetic sheet, and the outside of the second soft magnetic sheet so as to fix the first soft magnetic sheet, the third soft magnetic sheet, and the second soft magnetic sheet to each other on the magnetic core body of the magnetic core.

17. The magnetic coating portion includes a first soft magnetic sheet and a second soft magnetic sheet. The first soft magnetic sheet and the second soft magnetic sheet are arranged facing each other. The magnetic core body of the magnetic core includes an outer annular surface, an inner annular surface, a first side surface, and a second side surface. The outer annular surface surrounds the inner annular surface, The first side and the second side are arranged opposite each other and are connected between the outer annular surface and the inner annular surface, The first soft magnetic sheet and the second soft magnetic sheet of the magnetic coating portion each cover both sides of the outer annular surface. The first winding is located between the second winding and the first soft magnetic sheet. The second winding is located between the first winding and the second soft magnetic sheet. The magnetic assembly further comprises a fixing part, The magnetic assembly according to claim 8, characterized in that the fixing portion surrounds the outside of the first soft magnetic sheet and the outside of the second soft magnetic sheet so as to fix the first soft magnetic sheet and the second soft magnetic sheet to each other on the magnetic core body of the magnetic core.

18. The magnetic coating portion further includes a third soft magnetic sheet connected between one end of the first soft magnetic sheet and one end of the second soft magnetic sheet. The magnetic assembly according to claim 17, characterized in that the third soft magnetic sheet has an arc-shaped structure.

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