Inductor

Abstract

The inductor comprises a bottom plate and a cover plate which are arranged at an interval, the first magnetic column, the second magnetic column and the third magnetic column are arranged between the bottom plate and the cover plate, the first magnetic column and the third magnetic column are located on the two opposite sides of the second magnetic column respectively in a first plane, and the first plane is parallel to the bottom plate; the secondary winding is wound on the second magnetic column; the primary winding is wound on the secondary winding, the primary winding comprises a first section, a second section and a third section, the first section is located between the secondary winding and the first magnetic column, the third section is located between the secondary winding and the third magnetic column, and the second section is located between the first section and the third section; the extension part is arranged on the second section, and the extension part is exposed out of a space defined by the bottom plate, the cover plate, the first magnetic column and the third magnetic column. According to the scheme, the heat dissipation efficiency of the inductor can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of inductors, in particular to an inductor. Background Art

[0002] With the continuous development of high-tech technologies such as computers and the Internet of Things in recent years, the update and iteration of various intelligent electrical equipment, which are the hardware foundation of the above technologies, have become increasingly frequent, and the design and manufacturing of these electrical equipment have gradually begun to develop towards integration and miniaturization. Taking the electric vehicle industry as an example, in order to further improve space utilization and reduce the weight of the vehicle to reduce energy consumption, the inductors adapted to the vehicle also need to be miniaturized accordingly. How to make the inductor take into account the dual advantages of high power and small size has become one of the problems that the industry urgently needs to solve.

[0003] In order to solve the above technical problems, some manufacturers have made improvements to the structure of the inductor. Figure 1 This is a schematic diagram of an existing inductor A0. Figure 1 The inductor A0 includes an upper magnetic core A1 and a lower magnetic core A2, and a first coil A3 and a second coil A4 surrounded by the upper magnetic core A1 and the lower magnetic core A2, wherein the second coil A4 is accommodated in the internal space surrounded by the first coil A3, thereby reducing the external size of the inductor A0 to a certain extent. However, under high-power working conditions, due to the thermal effect caused by the resistance of the first coil A3 and the second coil A4 themselves, the temperature of the inductor A0 will gradually increase. Excessive temperature will affect the efficiency of voltage conversion, increase losses, and even burn the internal parts of the inductor A0. Utility Model Content

[0004] The technical problem solved by the utility model is to provide an inductor with better heat dissipation effect.

[0005] To solve the above technical problems, an embodiment of the utility model provides an inductor, comprising: a base plate and a cover plate arranged at intervals; a first magnetic column, a second magnetic column and a third magnetic column, which are arranged between the base plate and the cover plate, and the first magnetic column and the third magnetic column are respectively located on opposite sides of the second magnetic column in a first plane, wherein the first plane is parallel to the base plate; a secondary winding, which is wound around the second magnetic column; a primary winding, which is wound around the secondary winding, and the primary winding comprises a first section, a second section and a third section, the first section is located between the secondary winding and the first magnetic column, the third section is located between the secondary winding and the third magnetic column, and the second section is located between the first section and the third section; an extension portion, which is arranged at the second section, and the extension portion is exposed outside the space enclosed by the base plate, the cover plate, the first magnetic column and the third magnetic column.

[0006] Optionally, the extension portion includes a main body portion, and the main body portion extends from the second section toward the base plate and / or the cover plate.

[0007] Optionally, a connection between the main body and the second section is located in the middle of the second section.

[0008] Optionally, at least at the connection between the main body and the second section, a width of the main body along a direction from the first magnetic column to the second magnetic column is greater than or equal to a width of the second section along a direction from the bottom plate to the cover plate.

[0009] Optionally, along the direction from the first magnetic column to the second magnetic column, the width of the main body is not less than the width of the second magnetic column.

[0010] Optionally, the main body portion extends to be flush with the outer surface of the base plate, and the base plate and / or the cover plate are provided with a clearance gap for accommodating the extension portion.

[0011] Optionally, the main body portion extends to be flush with the outer surface of the cover plate, and the bottom plate and / or the cover plate are provided with a clearance gap for accommodating the extension portion.

[0012] Optionally, the extension portion further includes a wing portion, which is arranged on at least one side of the main body portion along a direction from the bottom plate to the cover plate, and an extension direction of the wing portion is parallel to a direction from the first magnetic column to the second magnetic column.

[0013] Optionally, a projection of the wing portion along the extension direction of the second magnetic column at least partially overlaps with the bottom plate or the cover plate on the side.

[0014] Optionally, the extension portion and the second section are integrally formed.

[0015] Optionally, the extension portion is plate-shaped and covers the second section, the bottom plate, the cover plate, the first magnetic column and the end portions of the third magnetic column along the extension direction of the second magnetic column, and the extension portion is made of metal material.

[0016] Optionally, the extension portion is plate-shaped and covers the second section, the bottom plate, the cover plate, the first magnetic column and the end portions of the third magnetic column along the extension direction of the second magnetic column, and the extension portion is made of metal material.

[0017] Optionally, for any one of the first magnetic column, the second magnetic column and the third magnetic column, an air gap exists on the magnetic column.

[0018] Optionally, there is an air gap between the magnetic column and the bottom plate and / or cover plate.

[0019] Optionally, at least two of the multiple air gaps have different widths.

[0020] Optionally, the width of a single air gap varies along the extension direction of the magnetic column.

[0021] Optionally, the inductor further includes: a non-magnetic electrical insulation layer for adjusting the width of the air gap, wherein the thickness of the non-magnetic electrical insulation layer arranged on the first magnetic column is different from the thickness of the non-magnetic electrical insulation layer arranged on the third magnetic column.

[0022] Optionally, the inductor further includes: a non-magnetic electrical insulation layer, which is used to adjust the width of the air gap, and the non-magnetic electrical insulation layer with the same thickness is respectively arranged on the third magnetic column and the second magnetic column.

[0023] Compared with the prior art, the technical solution of the embodiment of the utility model has the following beneficial effects:

[0024] An embodiment of the utility model provides an inductor, comprising: a base plate and a cover plate arranged at intervals; a first magnetic column, a second magnetic column and a third magnetic column, which are arranged between the base plate and the cover plate, and the first magnetic column and the third magnetic column are respectively located on opposite sides of the second magnetic column in a first plane, wherein the first plane is parallel to the base plate; a secondary winding, which is wound around the second magnetic column; a primary winding, which is wound around the secondary winding, and the primary winding comprises a first section, a second section and a third section, the first section is located between the secondary winding and the first magnetic column, the third section is located between the secondary winding and the third magnetic column, and the second section is located between the first section and the third section; an extension portion, which is arranged at the second section, and the extension portion is exposed outside the space enclosed by the base plate, the cover plate, the first magnetic column and the third magnetic column.

[0025] Compared with the design of the existing inductor structure, the present embodiment increases the area of ​​the primary winding exposed outside the base plate and the cover plate by arranging an extension portion on the primary winding, thereby effectively transferring the heat generated by the primary winding and the secondary winding during operation to the outside of the inductor to achieve a better heat dissipation effect, thereby preventing the inductor temperature from being too high, thereby reducing the working efficiency and even burning the internal parts.

[0026] Furthermore, by designing the extension part, the area of ​​the top of the primary winding (i.e., the location of the second section and the extension part) can be increased, and when the inductor is assembled to the circuit board, the vacuum suction cup of the assembly machine can directly suck the intersection of the extension part and the second section, without having to attach an additional plastic label to the top of the inductor as in the prior art. This can save production costs and also prevent the label from affecting the heat dissipation effect.

[0027] Furthermore, by designing that at least two of the multiple air gaps have different widths, or that the width of a single air gap varies along the extension direction of the magnetic column, the inductance between the primary winding and the secondary winding is saturated in stages, thereby increasing the saturation current of the inductance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of an inductor in the prior art;

[0029] Figure 2 is a schematic diagram of an inductor according to the first embodiment of the utility model;

[0030] Figure 3 yes Figure 2 A top view of the inductor shown;

[0031] Figure 4 yes Figure 2 Schematic diagram of the primary winding;

[0032] Figure 5 yes Figure 2 The assembly flow chart of the inductor shown;

[0033] Figure 6 is a schematic diagram of an inductor according to the second embodiment of the utility model;

[0034] Figure 7 yes Figure 6 Exploded diagram of the inductor shown;

[0035] Figure 8 is a schematic diagram of an inductor according to the third embodiment of the utility model;

[0036] Fig. 9 yes Figure 8 Exploded diagram of the inductor shown;

[0037] Fig.10 is a schematic diagram of an inductor according to a fourth embodiment of the utility model;

[0038] Fig.11 yes Fig.10 Exploded diagram of the inductor shown;

[0039] Fig.12 is a schematic diagram of an inductor according to a fifth embodiment of the utility model;

[0040] Fig.13 yes Fig.12 Exploded diagram of the inductor shown;

[0041] Fig.14 It is an exploded diagram of an inductor according to the sixth embodiment of the utility model;

[0042] Fig.15It is an exploded diagram of an inductor according to the seventh embodiment of the utility model. DETAILED DESCRIPTION

[0043] As mentioned in the background technology, under high-power working conditions, the temperature of the inductor will gradually increase due to the thermal effect caused by the resistance of the internal winding (also called "coil") of the inductor. Excessive temperature will affect the efficiency of voltage conversion, increase losses, and even burn the internal parts of the inductor.

[0044] To solve the above technical problems, an embodiment of the utility model provides an inductor, comprising: a base plate and a cover plate arranged at intervals; a first magnetic column, a second magnetic column and a third magnetic column, which are arranged between the base plate and the cover plate, and the first magnetic column and the third magnetic column are respectively located on opposite sides of the second magnetic column in a first plane, wherein the first plane is parallel to the base plate; a secondary winding, which is wound around the second magnetic column; a primary winding, which is wound around the secondary winding, and the primary winding comprises a first section, a second section and a third section, the first section is located between the secondary winding and the first magnetic column, the third section is located between the secondary winding and the third magnetic column, and the second section is located between the first section and the third section; an extension portion, which is arranged at the second section, and the extension portion is exposed outside the space enclosed by the base plate, the cover plate, the first magnetic column and the third magnetic column.

[0045] This embodiment of the invention increases the area of ​​the primary winding exposed outside the bottom plate and the cover plate by providing an extension portion on the primary winding, so that the heat generated by the primary winding and the secondary winding during operation can be effectively transferred to the outside of the inductor. Therefore, the inductor of this embodiment can achieve a better heat dissipation effect while taking into account high power and small size, so as to avoid the inductor temperature being too high to reduce the working efficiency or even burn the internal parts.

[0046] Next, the embodiments of the utility model are described in detail with reference to the accompanying drawings. The same reference numerals are used to mark the same parts in each figure. Each embodiment is only an example, and of course, the structures shown in different embodiments can be partially replaced or combined. In the modified example, the description of the matters common to the first embodiment is omitted, and only the differences are described. In particular, the same effects produced by the same structure are no longer mentioned one by one according to each embodiment.

[0047] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] For ease of description, in the following embodiments, the direction from the bottom plate 1 to the cover plate 2 is recorded as the x direction, the direction from the first magnetic column 3 to the second magnetic column 4 is recorded as the y direction, and the extending direction (also called the length direction) of the first magnetic column 3, the second magnetic column 4 and the third magnetic column 5 is recorded as the z direction. The up-down direction refers to the z direction and its opposite direction, the front-back direction refers to the x direction and its opposite direction, and the left-right direction refers to the y direction and its opposite direction.

[0049] (Example 1)

[0050] Figure 2 FIG. 1 is a schematic diagram of an inductor 100 according to the first embodiment of the present invention. Figure 3 yes Figure 2 A top view of the inductor 100 is shown. Figure 4 yes Figure 2 Schematic diagram of the primary winding 7. Figure 5 yes Figure 2 The inductor 100 is shown as an assembly flow chart. The inductor 100 described in this embodiment can be applied to application scenarios such as communication and server power supply.

[0051] Specifically, refer to Figure 2 , Figure 3 and Figure 5 , the inductor 100 includes a base plate 1 and a cover plate 2 which are spaced apart. Further, a first magnetic column 3, a second magnetic column 4 and a third magnetic column 5 are disposed between the base plate 1 and the cover plate 2. Further, in a first plane, the first magnetic column 3 and the third magnetic column 5 are respectively located on opposite sides of the second magnetic column 4, wherein the first plane is parallel to the base plate 1. For example, the first magnetic column 3, the second magnetic column 4 and the third magnetic column 5 are sequentially spaced apart along the y direction between the base plate 1 and the cover plate 2. Further, along the x direction, the cover plate 2 is disposed in front of the base plate 1.

[0052] Furthermore, the first magnetic column 3 , the second magnetic column 4 , the third magnetic column 5 , the bottom plate 1 and the cover plate 2 are all made of magnetic materials.

[0053] Further, if Figure 5 , along the y direction, the first magnetic column 3 and the third magnetic column 5 are respectively arranged on both sides of the bottom plate 1. Moreover, the surfaces of the first magnetic column 3 and the third magnetic column 5 facing away from the second magnetic column 4 can be flush with the two side surfaces of the bottom plate 1 and the cover plate 2 in the y direction.

[0054] Furthermore, during production, half of the first magnetic column 3, the second magnetic column 4, and the third magnetic column 5 (for example, the half divided along the z direction) can be pre-connected to the base plate 1, and the other half can be pre-connected to the cover plate 2. As a result, the appearance and shape of the base plate 1 and the cover plate 2 can be the same, and both are prefabricated as E-type magnetic cores, and no distinction can be made during production, which is conducive to simplifying the process flow and reducing production costs. Further, when the base plate 1 and the cover plate 2 are buckled, for each of the first magnetic column 3, the second magnetic column 4, and the third magnetic column 5, the two halves divided along the z direction touch each other. Further, there can be an air gap 10 at the connection between the two halves. Further, the size ratio of the air gap 10 formed in the first magnetic column 3 and the air gap 10 formed in the third magnetic column 5 can be selected from the following range: 1:1 to 1:10.

[0055] Further, combined with Figure 4 , the inductor 100 also includes a secondary winding 6 and a primary winding 7, the secondary winding 6 is wound around the second magnetic column 4, and the primary winding 7 is wound around the secondary winding 6. Further, the lower ends of the secondary winding 6 and the primary winding 7 along the z direction are respectively configured as a secondary pin 61 and a primary pin 71. Specifically, the lower end of the secondary winding 6 includes two secondary pins 61 arranged at intervals, and there is a non-zero gap between the two secondary pins 61 to prevent the secondary winding 6 from being turned on to form a closed loop. Further, a pair of primary pins 71 of the primary winding 7 are bent outward, that is, bent in directions away from each other; a pair of primary pins 61 of the secondary winding 6 are bent inward, that is, bent in directions close to each other.

[0056] Furthermore, the outer surface of the second magnetic column 4 and the inner surface of the secondary winding 6 are in contact with each other to reduce the assembly gap, which is beneficial to reducing the overall size of the compressor 100 and improving space utilization.

[0057] Furthermore, the lower end of the primary winding 7 also includes two primary pins 71 spaced apart. Furthermore, a pair of secondary pins 61 and a pair of primary pins 71 are in the same plane. For any pair of pins, one of them can be used as a current introduction terminal, and the other of them can be used as a current extraction terminal.

[0058] Further, the material of the secondary winding 6 may be, for example, tinned copper. Further, an insulating material may be provided between the secondary winding 6 and the primary winding 7. For example, an insulating double-sided adhesive tape 62 may be attached to the surface of the secondary winding 6 facing the primary winding 7. Thus, the assembly between the secondary winding 6 and the primary winding 7 can be made more stable, and an insulating connection between the secondary winding 6 and the primary winding 7 can be achieved.

[0059] In a variation of this embodiment, insulation connection between the primary winding 7 and the secondary winding 6 can also be achieved by spraying or electroplating an insulating material on the surface of the secondary winding 6.

[0060] Further, along the x direction, the primary winding 7 is clamped between the bottom plate 1 and the cover plate 2. Further, the primary winding 7 can be bonded to the bottom plate 1 and the cover plate 2 by dispensing 1001.

[0061] Further, the primary winding 7 includes a first section 72, a second section 73, and a third section 74. The first section 72 is located between the secondary winding 6 and the first magnetic post 3. The third section 74 is located between the secondary winding 6 and the third magnetic post 5. The second section 73 is located between the first section 72 and the third section 74.

[0062] Along the x direction, the projection of the primary winding 7 can be in a "ji" shape. Further, the primary pins 71 are respectively formed at the ends of the first section 72 and the third section 74 that face away from the second section 73. More specifically, the ends of the first section 72 and the third section 74 of the primary winding 7 that face away from the second section 73 are bent away from each other. In the assembled state, the end faces of the primary pins 71 are exposed on two sides of the inductor 100 along the y direction. And for any one side, the primary pins 71 are located in the notch surrounded by the first magnetic post 3 (or the third magnetic post 5), the bottom plate 1, and the cover plate 2.

[0063] Further, continue to refer to Figures 2 to 5 , the inductor 100 further includes an extension portion 8. The extension portion 8 is provided on the second section 73. The extension portion 8 and the second section 73 are jointly exposed outside the space surrounded by the bottom plate 1, the cover plate 2, the first magnetic post 3, and the third magnetic post 5.

[0064] Further, the extension portion 8 and the second section 73 can be integrally formed.

[0065] Further, the second magnetic post 4, the primary winding 7, and the secondary winding 6 are accommodated in the space.

[0066] Further, along the z direction, both the top and the bottom of the space have openings. Among them, the opening at the top is used to expose the second section 73 and the extension portion 8 to increase the heat dissipation area and improve the heat dissipation rate. The opening at the bottom is used to expose the primary pins 71 and the secondary pins 61 to connect to input and output devices.

[0067] Further, the extension portion 8 includes a main body portion 81. The main body portion 81 extends from the second section 73 towards the bottom plate 1 and the cover plate 2. Further, the extending direction of the main body portion 81 can be parallel to the x direction.

[0068] In a feasible solution of this embodiment, the main body 81 may also extend from the second section 73 toward the bottom plate 1, or toward the cover plate 2. In this way, the manufacturing process can be simplified and the production cost can be saved.

[0069] Furthermore, a connection point between the main body 81 and the second section 73 is located in the middle of the second section 73 .

[0070] Furthermore, at least at the connection between the main body 81 and the second section 73, the width of the main body 81 along the direction from the first magnetic column 3 to the second magnetic column 4 (for example, the y direction) is greater than or equal to the width of the second section 73 along the direction from the bottom plate 1 to the cover plate 2 (for example, the x direction). Thus, the heat dissipation area can be effectively increased and the heat dissipation effect can be optimized.

[0071] Furthermore, the main body 81 extends to be flush with the outer surfaces of the bottom plate 1 and the cover plate 2, and the bottom plate 1 and the cover plate 2 are provided with a gap 9 for accommodating the extension portion 8. Thus, the appearance of the inductor 100 can be made more concise and beautiful, and the overall size can be reduced.

[0072] In a feasible solution of this embodiment, the main body 81 may also extend to be flush with the outer surface of the bottom plate 1 or the cover plate 2 , and accordingly, a clearance notch 9 for avoiding the extension portion 8 is provided on the bottom plate 1 or the cover plate 2 .

[0073] Furthermore, the shape of the clearance notch 9 may be adapted to the shape of the extension portion 8 to reduce the assembly gap and increase the structural stability.

[0074] In a typical application scenario, the assembly process of the inductor 100 described in this embodiment may include the following steps:

[0075] First, an insulating double-sided tape 62 is pasted on the outer surface of the secondary winding 6, and then the secondary winding 6 is placed in the space surrounded by the primary winding 7, and the inner surface of the primary winding 7 and the outer surface of the secondary winding 6 are bonded to each other.

[0076] Then, the secondary winding 6 is wound on the second magnetic column 4 connected to the bottom plate 1. At this time, the first section 72 and the third section 74 of the primary winding 7 are respectively located in the gaps between the first magnetic column 3 and the second magnetic column 4 and the second magnetic column 4 and the third magnetic column 5, and the extension 8 is located in the clearance gap 9 on the bottom plate 1. Further, glue 1001 can be dispensed on the bottom plate 1 in advance, and then the primary winding 7 and the secondary winding 6 can be installed on the bottom plate 1 to increase the stability of the connection.

[0077] Further, the cover plate 2 is covered on the base plate 1 in the opposite direction of the x-direction. At this time, each of the first magnetic column 3, the second magnetic column 4 and the third magnetic column 5 is respectively connected to the two parts of the base plate 1 and the cover plate 2 and combined into one. In addition, one end of the extension portion 8 facing the x-direction is located in the clearance gap 9 on the cover plate 2. Further, glue 1001 can be pre-dotted on the surface of the primary winding 7 facing the x-direction. When the cover plate 2 is buckled onto the base plate 1, the primary winding 7 can be bonded to the cover plate 2, which is beneficial to improving the structural stability. Further, the complete first magnetic column 3 and the complete third magnetic column 5 can close the two sides of the second magnetic column 4 along the y-direction to form a closed magnetic flux loop on the plane formed by the y-direction and the x-direction.

[0078] As described above, by adopting the technical solution of the first embodiment of the utility model, by providing the extension portion 8 on the primary winding 7, the area of ​​the primary winding 7 exposed outside the bottom plate 1 and the cover plate 2 is increased, so that the heat generated by the primary winding 7 and the secondary winding 6 during operation can be effectively transferred to the outside of the inductor 100. Therefore, the inductor 100 of this embodiment can achieve a better heat dissipation effect while taking into account high power and small size, so as to avoid the inductor 100 from having too high a temperature, thereby reducing the working efficiency, or even burning the internal parts.

[0079] Furthermore, by designing the extension 8, the area of ​​the top of the primary winding 7 (i.e., the location of the second section 73 and the extension 8) can be increased, and when the inductor 100 is assembled to the circuit board, the vacuum suction cup of the assembly machine can directly suck the intersection of the extension 8 and the second section 73, without having to attach an additional plastic label to the top of the inductor 100 as in the prior art. This can save production costs and also prevent the label from affecting the heat dissipation effect.

[0080] To verify the above conclusion, the inventors conducted simulation experiments on the inductor 100 shown in the first embodiment and an inductor A0 in the prior art. The experimental results show that under the same loss, the maximum temperature of the inductor 100 in the first embodiment is about 107 degrees Celsius (°C), while the maximum temperature of the inductor A0 in the prior art is about 113 degrees Celsius (°C). At the same time, the area of ​​the inductor 100 with a temperature higher than 105°C is significantly less than that of the inductor A0 in the prior art.

[0081] From this, we can conclude that Figure 2 The inductor 100 of the first embodiment shown in the figure increases the area of ​​the primary winding 7 exposed outside the base plate 1 and the cover plate 2 through the design of the extension portion 8, thereby effectively enhancing the heat dissipation effect.

[0082] (Example 2)

[0083] Figure 6 It is a schematic diagram of an inductor 200 according to the second embodiment of the utility model. Figure 7 yes Figure 6 An exploded diagram of the inductor 100 is shown.

[0084] In this embodiment, the main difference from the above-mentioned embodiment 1 is that the base plate 1, the first magnetic column 3, the second magnetic column 4 and the third magnetic column 5 are integrally formed and made of ferrite material, and the cover plate 2 is made of a metal powder core.

[0085] Specifically, if Figure 7 In this embodiment, the first magnetic column 3, the second magnetic column 4 and the third magnetic column 5 are integrally formed with the base plate 1 to form an E-type magnetic core. Correspondingly, the cover plate 2 is a plate-like structure to form an I-type magnetic core. Furthermore, the surface of the cover plate 2 facing the base plate 1 is a flat plane. When the cover plate 2 is buckled onto the base plate 1, the plane of the base plate 1 facing the cover plate 2 simultaneously touches the end faces of the first magnetic column 3, the second magnetic column 4, the third magnetic column 5, and the primary winding 7 and the secondary winding 6 facing the x direction.

[0086] In a feasible solution of this embodiment, the first magnetic column 3, the second magnetic column 4, the third magnetic column 5, the primary winding 7 and the secondary winding 6 can be connected to the cover plate 2 by using glue dispensing 1001, and there can be an air gap 10 between them.

[0087] Furthermore, the thicknesses of the first magnetic column 3, the second magnetic column 4 and the third magnetic column 5 in the x direction may be the same. In other words, the end surfaces of the first magnetic column 3, the second magnetic column 4 and the third magnetic column 5 facing the x direction may be flush.

[0088] Furthermore, during the assembly process, the end surfaces of the primary winding 7 and the secondary winding 6 facing the x direction may also be flush with the end surfaces of the first magnetic column 3 , the second magnetic column 4 and the third magnetic column 5 facing the x direction.

[0089] Therefore, by adopting the scheme described in Example 2, the loss of the first magnetic column 3, the second magnetic column 4 and the third magnetic column 5 made of ferrite material is reduced, which is conducive to cost saving. Furthermore, the cover plate made of metal powder core has low magnetic permeability, which can reduce the air gap 10, thereby reducing magnetic leakage and improving the efficiency of the transformer.

[0090] (Example 3)

[0091] Figure 8 It is a schematic diagram of an inductor 300 according to the third embodiment of the utility model. Fig. 9 yes Figure 8 An exploded view of the inductor 300 is shown.

[0092] The present embodiment is different from the above-mentioned embodiment 1 mainly in that, along the direction from the first magnetic column 3 to the second magnetic column 4 (eg, the y direction), the width of the main body 81 is not less than the width of the second magnetic column 4 .

[0093] Specifically, Figure 7 As shown, in this embodiment, the surface area of ​​the main body 81 in the x direction can be enlarged by increasing the width of the main body 81 in the y direction, thereby increasing the area of ​​the connection between the main body 81 and the second section 73.

[0094] Furthermore, the width of the avoidance notch 9 on the bottom plate 1 and the cover plate 2 in the y direction is also adjusted accordingly to match the main body 81 .

[0095] Therefore, by adopting the solution described in Example 3, the area of ​​the top of the primary winding 7 can be further increased to increase the area that can dissipate heat and further improve the heat dissipation rate.

[0096] In a variation, the upper surface of the main body 81 may also be in a trapezoidal shape. The upper base of the trapezoid is connected to the second segment 73, and the length of the upper base is at least equal to the length of the second segment 73 in the y direction. Furthermore, the length of the lower base of the trapezoid may be equal to the length of the bottom plate 1 in the y direction. In this way, the exposed area of ​​the primary winding 7 can be further increased, and the heat dissipation rate can be improved.

[0097] Furthermore, through the design of the extension portion 8, the area of ​​the top of the primary winding 7 can be increased. When the inductor 100 is assembled to the circuit board, the vacuum suction cup of the assembly machine can directly suck the intersection of the extension portion 8 and the second section 73, which is convenient for taking and assembling the inductor 300.

[0098] (Example 4)

[0099] Fig.10 FIG. 4 is a schematic diagram of an inductor 400 according to a fourth embodiment of the present invention. Fig.11 yes Fig.10 An exploded view of the inductor 400 is shown.

[0100] In this embodiment, the main difference from the above-mentioned Embodiment 1 is that the extension portion 8 also includes a wing portion 82, which is arranged on at least one side of the main body portion 81 along the direction of the base plate 1 pointing to the cover plate 2 (for example, the x direction), and the extension direction of the wing portion 82 is parallel to the direction of the first magnetic column 3 pointing to the second magnetic column 4 (for example, the y direction).

[0101] Furthermore, since the extension portion 8 covers the top of the bottom plate 1 and the cover plate 2 along the z direction, there is no need to provide an additional avoidance notch 9. Thus, the manufacturing steps can be simplified and the processing complexity of the bottom plate 1 and the cover plate 2 can be reduced.

[0102] Specifically, combined Fig.10 and Fig.11, in this embodiment, further, the wing portions 82 are disposed on both sides of the main body portion 81 in the x direction. Further, the projections of the extension portion 8 and the second section 73 in the x direction may, for example, be in the shape of a "king" character or a "worker" character.

[0103] Further, the projection of the wing portion 82 along the extending direction of the second magnetic column 4 overlaps with the bottom plate 1 or the cover plate 2 on the corresponding side. In other words, the length of the wing portion 82 in the y direction is equal to the length of the bottom plate 1 or the cover plate 2 on the corresponding side. Thereby, the appearance of the inductor 400 can be made more tidy, and it is also beneficial to maximize the heat dissipation efficiency without increasing the size of the inductor 400.

[0104] Further, in the x direction, the front surface and the rear surface of the wing portion 82 are flush with the bottom plate 1 and the cover plate 2 respectively.

[0105] In a variant, the wing portion 82 may also be disposed on any one side of the main body portion 81 in the x direction.

[0106] Thereby, by adopting the solution of Embodiment 4, the area at the top of the primary winding 7 can be further increased to enlarge the heat dissipation area, and the heat dissipation rate can be further improved. Further, the area of the extension portion 8 is further increased. When assembling the inductor 100 onto the circuit board, the vacuum chuck of the assembling machine can directly suck the intersection of the extension portion 8 and the second section 73, which is convenient for the taking and assembling of the inductor 300.

[0107] (Embodiment 5)

[0108] Fig.12 It is a schematic diagram of an inductor 500 according to the fifth embodiment of the present invention. Fig.13 is Fig.12 an exploded view of the shown inductor 500.

[0109] In this embodiment, the main difference from the above Embodiment 1 is that the extension portion 8 is in a plate shape and covers the ends of the second section 73, the bottom plate 1, the cover plate 2, the first magnetic column 3 and the third magnetic column 5 along the extending direction of the second magnetic column 4, and the extension portion 8 is made of a metal material.

[0110] Further, since the extension portion 8 covers the tops of the bottom plate 1 and the cover plate 2 in the z direction at this time, there is no need to additionally provide an avoidance notch (such as Fig. 9 the shown avoidance notch 9). Thereby, the manufacturing steps can be simplified.

[0111] Furthermore, the extension part 8 can be an independent metal sheet structure. After the bottom plate 1, the primary winding 7, the secondary winding 6 and the cover plate 2 are assembled, the extension part 8 can be covered on the top of the assembly. At this time, the upper surfaces of the bottom plate 1, the primary winding 7 and the cover plate 2 are in contact with the lower surface of the extension part 8.

[0112] Further, the extension part 8 and the primary winding 7 can be connected by gluing or other methods to avoid accidental falling. Further, the material of the extension part 8 can be metal, and the extension part 8 can be electrically connected to the primary winding 7. In this case, the extension part 8 can be regarded as a part of the primary winding 7.

[0113] Therefore, by adopting the scheme described in Example 5, the area of ​​the top of the primary winding 7 can be further increased to increase the heat dissipation area and further improve the heat dissipation rate. In addition, by designing the extension portion 8, the area of ​​the top of the primary winding 7 can be increased, which facilitates the use and assembly of the inductor 300.

[0114] (Example 6)

[0115] Fig.14 It is an exploded diagram of an inductor 600 according to the sixth embodiment of the utility model.

[0116] The present embodiment is different from the above-mentioned embodiment 1 mainly in that there are air gaps 10 (such as Figure 3 ). Further, the inductor 600 further includes: a non-magnetic electrical insulation layer 101, which is used to adjust the width of the air gap 10, wherein the thickness of the non-magnetic electrical insulation layer 101 arranged on the first magnetic column 3 is different from the thickness of the non-magnetic electrical insulation layer 101 arranged on the third magnetic column 5.

[0117] Furthermore, for each of the first magnetic column 3 and the third magnetic column 5, the air gap 10 can be set in the middle of the magnetic column. For example, the air gap 10 can be set at the connection between the first magnetic column 3 (or the third magnetic column 5) and the two halves of the bottom plate 1 and the cover plate 2. Alternatively, the air gap 10 can also be set between the magnetic column and the bottom plate 1 or the cover plate 2.

[0118] Furthermore, the non-magnetic electrical insulating layer 101 may be a non-magnetic electrical insulating film or glue mixed with non-magnetic electrical insulating particles. The non-magnetic electrical insulating particles may be, for example, glass beads 1011. Thus, the thickness of the non-magnetic electrical insulating layer 101 may be adjusted by adjusting the diameter of the glass beads 1011, thereby adjusting the width of the air gap 10.

[0119] In this embodiment, the diameter of the glass bead 1011 in the first magnetic column 3 is greater than the diameter of the glass bead 1011 in the third magnetic column 5 . In other words, the width of the air gap 10 in the first magnetic column 3 is greater than the width of the air gap 10 in the third magnetic column 5 .

[0120] In a feasible solution of this embodiment, the width of a single air gap 10 varies along the extension direction of the magnetic column.

[0121] In a variation of this embodiment, air gaps 10 may exist on the first magnetic column 3, the second magnetic column 4, and the third magnetic column 5. Moreover, at least two of the three air gaps 10 have different widths.

[0122] Therefore, by adopting the scheme described in Example 6, the side with a smaller air gap 10 (for example, the side of the third magnetic column 5) reaches saturation first by varying the size of the air gap 10, thereby achieving phased saturation and increasing the saturation current. Furthermore, the air gap 10 can also be used to optimize the heat dissipation effect.

[0123] (Example 7)

[0124] Fig.15 It is an exploded view of an inductor 700 according to the seventh embodiment of the present invention.

[0125] In this embodiment, the main difference from the above-mentioned embodiment 6 is that the non-magnetic electrical insulation layer 101 with the same thickness is respectively provided on the third magnetic column 5 and the second magnetic column 4 .

[0126] Furthermore, the size of the air gap 10 at the first magnetic column 3 can be adjusted by grinding or the like. In this scenario, the air gap 10 at the second magnetic column 4 is equal to the air gap 10 at the third magnetic column 5 and is smaller than the air gap 10 at the first magnetic column 3 .

[0127] Therefore, by adopting the scheme described in Example 7, the side with a smaller air gap 10 (for example, the side of the third magnetic column 5) reaches saturation first by varying the size of the air gap 10, thereby achieving phased saturation and increasing the saturation current. Furthermore, the air gap 10 can also be used to optimize the heat dissipation effect.

[0128] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

[0129] Description of Reference Numerals

[0130] A1 Upper core

[0131] A2 Lower core

[0132] A3 First coil

[0133] A4 Second coil

[0134] A0, 100, 200, 300, 400, 500, 600, 700 inductance

[0135] 1001 Glue

[0136] 1 Bottom plate

[0137] 2 Cover

[0138] 3 First magnetic column

[0139] 4 Second magnetic column

[0140] 5 The third magnetic column

[0141] 6 Secondary Winding

[0142] 61 Secondary pin

[0143] 62 Insulation double-sided tape

[0144] 7 Primary Winding

[0145] 71 Primary Pin

[0146] 72 first paragraph

[0147] 73 Second paragraph

[0148] 74 Paragraph 3

[0149] 8 Extension

[0150] 81 Main body

[0151] 82 Wing

[0152] 9. Give way

[0153] 10 Air Gap

[0154] 101 Non-magnetic electrical insulation layer

[0155] 1011 Glass Beads

[0156] x Bottom plate points towards cover plate

[0157] yThe first magnetic column points to the direction of the second magnetic column

[0158] z The length direction of the first magnetic column, the second magnetic column and the third magnetic column.

Claims

1. An inductor, characterized in that: include: Base plates and cover plates arranged at intervals; A first magnetic column, a second magnetic column and a third magnetic column are arranged between the bottom plate and the cover plate, and the first magnetic column and the third magnetic column are respectively located on two opposite sides of the second magnetic column in a first plane, wherein the first plane is parallel to the bottom plate; A secondary winding, wound around the second magnetic column; A primary winding, wound around the secondary winding, the primary winding comprising a first section, a second section and a third section, the first section being located between the secondary winding and the first magnetic column, the third section being located between the secondary winding and the third magnetic column, and the second section being located between the first section and the third section; An extension portion is arranged in the second section, and the extension portion is exposed outside the space surrounded by the bottom plate, the cover plate, the first magnetic column and the third magnetic column.

2. The inductor according to claim 1, characterized in that: The extension portion includes a main body portion extending from the second section toward the bottom plate and / or the cover plate.

3. The inductor according to claim 2, characterized in that: The connection between the main body and the second section is located in the middle of the second section.

4. The inductor according to claim 2, characterized in that: At least at the connection between the main body and the second section, the width of the main body along the direction from the first magnetic column to the second magnetic column is greater than or equal to the width of the second section along the direction from the bottom plate to the cover plate.

5. The inductor according to claim 2, characterized in that: Along the direction from the first magnetic column to the second magnetic column, the width of the main body is not less than the width of the second magnetic column.

6. The inductor according to claim 2, characterized in that: The main body portion extends to be flush with the outer surface of the bottom plate and / or the cover plate, and the bottom plate and / or the cover plate are provided with a clearance gap to avoid the extension portion.

7. The inductor according to claim 2, characterized in that: The extension portion further includes a wing portion, which is arranged on at least one side of the main body portion along a direction from the bottom plate to the cover plate, and an extending direction of the wing portion is parallel to a direction from the first magnetic column to the second magnetic column.

8. The inductor according to claim 7, characterized in that: A projection of the wing portion along the extension direction of the second magnetic column at least partially overlaps with the bottom plate or the cover plate on the side.

9. The inductor according to claim 1, characterized in that: The extension portion is integrally formed with the second section.

10. The inductor according to claim 1, characterized in that: The extension part is plate-shaped and covers the second section, the bottom plate, the cover plate, the first magnetic column and the end of the third magnetic column along the extension direction of the second magnetic column. The extension part is made of metal material.

11. The inductor according to claim 1, characterized in that: The bottom plate, the first magnetic column, the second magnetic column and the third magnetic column are integrally formed and made of ferrite material, and the cover plate is made of a metal powder core.

12. The inductor according to any one of claims 1 to 11, characterized in that: For any one of the first magnetic column, the second magnetic column and the third magnetic column, an air gap exists on the magnetic column, and / or an air gap exists between the magnetic column and the bottom plate and / or the cover plate.

13. The inductor according to claim 12, characterized in that: At least two of the multiple air gaps have different widths, and / or the width of a single air gap varies along the extension direction of the magnetic column.

14. The inductor according to claim 12, characterized in that: Also includes: The non-magnetic electrical insulating layer is used to adjust the width of the air gap, wherein the thickness of the non-magnetic electrical insulating layer arranged on the first magnetic column is different from the thickness of the non-magnetic electrical insulating layer arranged on the third magnetic column.

15. The inductor according to claim 12, characterized in that: Also includes: The non-magnetic electrical insulation layer is used to adjust the width of the air gap. The non-magnetic electrical insulation layer with the same thickness is respectively arranged on the third magnetic column and the second magnetic column.

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