Inductor

Abstract

The utility model provides an inductor which comprises a magnetic core pair and a coil. When the coil is wound on the middle column, the portions, passing through the two end faces of the middle column in the width extending direction, of the coil are surrounded by the middle column, the side columns and the bottom plate. The parts, wound through the two end faces of the middle column in the length extending direction, of the coil can also be at least partially surrounded by the middle column, the bottom plate and the two side columns, that is, in the direction perpendicular to the bottom plate, the projection of the first protruding part and / or the projection of the second protruding part are / is at least partially located in the projection of the coil containing groove. Compared with an inductor in the related technology, the inductor has the advantages that the area of the coil wrapped by the magnetic core pair is effectively increased, and the magnetic leakage of the inductor can be reduced.

Description

Technical Field

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

[0002] Inductors are usually composed of a core pair, a coil, and insulating materials, and are widely used in various electronic devices. An E-type core can form a core pair with another E-type core or an I-type core. By properly selecting the core structure, core material, and number of coil turns, the inductance performance can be optimized, such as increasing the inductance value and reducing the size. With the continuous development of electronic technology, the manufacturing process and performance of E-type core inductors are also constantly improving to meet the high requirements of modern electronic devices for inductance.

[0003] The current E-type core inductors are mainly faced with problems such as magnetic leakage, temperature rise, and size. The magnetic leakage of the E-type core will cause magnetic field interference to the surrounding circuits, and will cause energy loss and reduce the working efficiency of the core. Since the structure of the E-type core inductor limits the heat dissipation effect, long-term high-load operation may cause excessive temperature rise, affecting the life and performance of the inductor, limiting the power density of the inductor, and also affecting the application environment of surrounding components. In addition, compared with some inductors of new materials or structures, the E-type core may be relatively large in size and weight, and the inductor composed of it is not conducive to miniaturization or lightweight application scenarios. Utility Model Content

[0004] The technical purpose of the utility model is to provide an E-shaped magnetic core and an inductor, aiming to solve at least one problem mentioned in the background technology.

[0005] To solve the above technical problems, the utility model is implemented as follows: an inductor includes a magnetic core pair and a coil;

[0006] The magnetic core pair comprises two opposite bottom plates, two side columns and a middle column connecting the two bottom plates, the side columns are arranged at two opposite sides of the bottom plate, and the middle column is arranged between the two side columns; the bottom plate is in the shape of a flat plate; the intersection line between the bottom plate and the side columns is defined as the length direction, the side columns are flush with the two ends of the bottom plate in the length extension direction, and the length of the middle column is less than the length of the side columns and the bottom plate; the middle column, the side columns and the bottom plate enclose a coil accommodating groove;

[0007] The coil is wound on the middle column; the two end faces of the middle column along the length extension direction are respectively a first end face and a second end face; the portion of the coil extending beyond the outer side of the plane where the first end face and the second end face are located are respectively a first protrusion and a second protrusion;

[0008] In a direction perpendicular to the bottom plate, a projection of the first protrusion and / or the second protrusion is at least partially located within a projection of the coil accommodating groove.

[0009] Furthermore, in a direction parallel to the bottom plate, the sum of the cross-sectional areas of the two side columns is smaller than the cross-sectional area of ​​the middle column.

[0010] Further, the magnetic core pair includes an E-type magnetic core and an I-type magnetic core that are arranged opposite to each other;

[0011] The E-shaped magnetic core and the I-shaped magnetic core each include a bottom plate, and the E-shaped magnetic core also includes the middle column and the two side columns arranged on the corresponding bottom plate;

[0012] The middle column and each of the side columns of the E-type magnetic core are in contact with and connected to the bottom plate of the I-type magnetic core, and the E-type magnetic core and the I-type magnetic core are enclosed to form the coil accommodating groove.

[0013] Further, in a direction perpendicular to the bottom plate, a projection of the first protrusion is located within a projection of the coil accommodating groove.

[0014] Furthermore, an air duct is formed between the E-type magnetic core, the I-type magnetic core and the coil, and a side of the inductor close to the first protrusion is an air inlet side of the air duct.

[0015] Furthermore, in a direction perpendicular to the base plate, a projection of the second protrusion is outside a projection of the coil accommodating groove; a second end face of the middle column is flush with an end face of the base plate along a length extension direction, and a lead-out pin of the coil is provided on the second protrusion.

[0016] Furthermore, the inductor further comprises a base;

[0017] The base is fixed to a side of the E-shaped magnetic core that is away from the I-shaped magnetic core, or the base is fixed to a side of the I-shaped magnetic core that is away from the E-shaped magnetic core;

[0018] In the length extension direction of the side column, one end of the lead pin of the base close to the coil exceeds the outer edge of the E-type magnetic core and the I-type magnetic core to form an outlet portion of the base, and the lead pin of the coil passes through the outlet portion.

[0019] Furthermore, in the length extension direction of the side column, one end of the lead pin on the base away from the coil also exceeds the outer edge of the E-type magnetic core and the I-type magnetic core, forming a fixed part of the base; a fixing part is provided on the fixed part, and the fixing part is used to fix the inductor to a circuit board or a supporting structure.

[0020] Furthermore, the middle column is in a rectangular parallelepiped shape, and the edges of the middle column surrounding the circumference of the coil are rounded.

[0021] Furthermore, the inductor also includes two skeletons symmetrically arranged around the middle column, the coil is wound on the skeleton, and the direction in which the two bottom plates are relatively arranged is defined as the thickness direction of the middle column, and the two ends of the skeleton along the thickness direction of the middle column are bent toward the coil.

[0022] Compared with the prior art, the inductor of the utility model has the following beneficial effects:

[0023] When the coil is wound on the center column, the parts of the coil passing through the two end surfaces of the center column along the width extension direction are surrounded by the center column, side columns and bottom plate. Since the length of the center column is smaller than the length of the side columns and the bottom plate, the parts of the coil passing through the two end surfaces of the center column along the length extension direction can also be at least partially surrounded by the center column, bottom plate and two side columns, that is, in the direction perpendicular to the bottom plate, the projection of the first protrusion and / or the second protrusion is at least partially located within the projection of the coil accommodating groove.

[0024] While the first protrusion and the second protrusion of the inductor in the related art are often exposed outside the bottom plate and the side column, compared with the inductor in the related art, the inductor in the utility model effectively increases the area of ​​the coil wrapped by the magnetic core pair, and can reduce the leakage magnetic field of the inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall structure of the inductor in the embodiment of the utility model;

[0026] Figure 2 is an exploded view of an inductor in an embodiment of the utility model;

[0027] Figure 3 is a schematic structural diagram of an inductor from another perspective in an embodiment of the utility model;

[0028] Figure 4 It is a partial structural schematic diagram of an inductor in an embodiment of the utility model;

[0029] Figure 5 It is a top view of the E-type magnetic core in the embodiment of the utility model;

[0030] Figure 6 It is a side view of an E-shaped magnetic core in an embodiment of the utility model;

[0031] Figure 7 Schematic diagram of the average magnetic flux path of the magnetic core pair in the embodiment of the utility model;

[0032] Figure 8 It is a top view of the E-shaped magnetic core after the coil is assembled in the embodiment of the utility model.

[0033] In the accompanying drawings, the reference numerals represent: 10, magnetic core pair; 10a, coil accommodating groove; 11, E-type magnetic core; 111, middle column; 111a, first end surface; 111b, second end surface; 112, side column; 113, bottom plate; 12, I-type magnetic core; 20, coil; 21, lead pin; 22, first protrusion; 23, second protrusion; 30, skeleton; 40, base; 41, wire outlet portion; 42, fixing portion; 43, fixing part. DETAILED DESCRIPTION

[0034] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] Example:

[0038] like Figures 1 to 8 As shown, in this embodiment, an inductor includes a magnetic core pair 10 and a coil 20;

[0039] The magnetic core pair 10 includes two opposite bottom plates 113, two side columns 112 connecting the two bottom plates 113, and a middle column 111, the side columns 112 are arranged at two opposite sides of the bottom plate 113, and the middle column 111 is arranged between the two side columns 112; the bottom plate 113 is in a flat plate shape; the intersection line of the bottom plate 113 and the side columns 112 is defined as the length direction, the side columns 112 are flush with the two ends of the bottom plate 113 in the length extension direction, and the length of the middle column 111 is less than the length of the side columns 112 and the bottom plate 113; the middle column 111, the side columns 112 and the bottom plate 113 enclose a coil accommodating groove 10a;

[0040] The coil 20 is wound on the middle column 111; the two end faces of the middle column 111 along the length extension direction are respectively the first end face 111a and the second end face 111b; the portions of the coil 20 extending outside the plane where the first end face 111a and the second end face 111b are located are respectively the first protrusion 22 and the second protrusion 23;

[0041] In a direction perpendicular to the bottom plate 113 , a projection of the first protrusion 22 and / or the second protrusion 23 is at least partially located within a projection of the coil 20 accommodating groove 10 a .

[0042] In this embodiment, if Figure 8 As shown, when the coil 20 is wound on the middle column 111, the portions of the coil 20 wound through the two end surfaces of the middle column 111 along the width extension direction are surrounded by the middle column 111, the side columns 112 and the bottom plate 113. Since the length of the middle column 111 is less than the lengths of the side columns 112 and the bottom plate 113, the portions of the coil 20 wound through the two end surfaces of the middle column 111 along the length extension direction can also be at least partially surrounded by the middle column 111, the bottom plate 113 and the two side columns 112, that is, in a direction perpendicular to the bottom plate 113, the projection of the first protrusion 22 and / or the second protrusion 23 is at least partially located within the projection of the coil 20 accommodating groove 10a.

[0043] In the inductor of the related art, the first protrusion 22 and the second protrusion 23 are often exposed outside the bottom plate 113 and the side column 112, and the coil 20 has serious magnetic leakage. However, the magnetic core pair 10 structure of the present application can increase the area of ​​the coil 20 wrapped by the magnetic core pair 10, which can reduce the magnetic leakage of the inductor and the magnetic field interference of the coil 20 on the surrounding circuit, thereby improving the working efficiency of the inductor.

[0044] It should be noted that the distance between the first end surface 111 a of the center column 111 and one end of the adjacent bottom plate 113 along the length extension direction can be specifically adjusted according to the required working parameters of the magnetic core pair 10 .

[0045] Correspondingly, a coil accommodating groove 10a is formed inside the magnetic core pair 10, and the two ends along the length extension direction of the side column 112 are the outlets of the coil accommodating groove 10a, and the two lead pins 21 of the coil 20 can be led out through the outlets at the same end or different ends of the coil accommodating groove 10a. In this way, the lead pins 21 of the coil 20 can be flexibly located.

[0046] The magnetic core pair 10 can be composed of two E-type magnetic cores 11 arranged opposite to each other, wherein the middle columns 111 and side columns 112 of the two E-type magnetic cores 11 are in contact and connected, and the coil 20 is wound around the middle column 111 formed by the two E-type magnetic cores 11; the magnetic core pair 10 can also be composed of an E-type magnetic core 11 and an I-type magnetic core 12 arranged opposite to each other.

[0047] Furthermore, if Figure 5 As shown, in the direction parallel to the bottom plate 113 , the sum of the cross-sectional areas of the two side columns 112 is smaller than the cross-sectional area of ​​the middle column 111 .

[0048] Specific as Figure 5 and 6 As shown, ignoring the rounded corners of the middle column 111, the cross-sectional area of ​​the middle column 111 is , the sum of the cross-sectional areas of the two side columns 112 , C1<C2, C2 / C1 can be 70%, 80%, 90% or any other ratio. The core pair 10 forms a closed magnetic circuit, and the coil 20 is wound around the middle column 111. Assuming that the scattered magnetic flux and the fillet are ignored, the magnetic flux density is uniform on the entire cross section of the core pair 10, and the average path of the magnetic flux is as follows: Figure 7 Shown by the dashed line.

[0049] The cross-sectional area of ​​the middle column 111 is also called the effective cross-sectional area of ​​the magnetic core. When the effective cross-sectional area of ​​the magnetic core increases, more magnetic flux can pass through the magnetic core when the effective magnetic path length is relatively short, thereby increasing the inductance value of the inductor. This design minimizes the volume of the magnetic core while ensuring the same inductance output. Increasing the effective cross-sectional area of ​​the magnetic core within the same volume can improve the anti-saturation ability of the magnetic core.

[0050] Furthermore, if Figure 2 and 7 As shown, the magnetic core pair 10 includes an E-type magnetic core 11 and an I-type magnetic core 12 that are arranged opposite to each other;

[0051] The E-type magnetic core 11 and the I-type magnetic core 12 each include a bottom plate 113 , and the E-type magnetic core 11 also includes a middle column 111 and two side columns 112 disposed on the corresponding bottom plate 113 ;

[0052] The middle column 111 and each side column 112 of the E-shaped magnetic core 11 are in contact with and connected to the bottom plate of the I-shaped magnetic core 12 , and the E-shaped magnetic core 11 and the I-shaped magnetic core 12 enclose and form a coil accommodating groove 10 a .

[0053] In this embodiment, the E-type magnetic core 11 and the I-type magnetic core 12 are selected to facilitate the processing of the inductor and have good consistency. Those skilled in the art can also select two E-type magnetic cores 11 or other types of magnetic cores according to actual needs.

[0054] Furthermore, if Figure 3 and 4 As shown, in a direction perpendicular to the bottom plate 113 , the projection of the first protrusion 22 is located within the projection of the coil accommodating groove 10 a .

[0055] Such an arrangement enables the first protruding portion 22 of the coil 20 to be completely wrapped by the magnetic core, thereby reducing magnetic leakage.

[0056] Furthermore, if Figure 3 As shown, an air duct is formed between the E-type magnetic core 11, the I-type magnetic core 12 and the coil 20, and the side of the inductor close to the first protrusion 22 is the air inlet side of the air duct.

[0057] The coil accommodating groove 10a is generally concave near the first protrusion 22, which is conducive to the formation of an air duct. When air enters from this side, the airflow of the air duct can pass through the middle column 111 of the E-shaped magnetic core 11 and the coil 20, thereby improving the heat dissipation efficiency of the capacitor.

[0058] Furthermore, if Figure 1 and Figure 5 As shown, in the direction perpendicular to the bottom plate 113, the projection of the second protrusion 23 is located outside the projection of the coil 20 accommodating groove 10a; the second end face 111b of the middle column 111 is flush with an end face of the bottom plate 113 along the length extension direction, and the second protrusion 23 is provided with a lead pin 21 of the coil 20.

[0059] In this embodiment, if Figure 4 As shown, the coil 20 is made of a flat wire and wound vertically. After the flat wire is wound vertically around the center column 111, both ends of the flat wire are led out from the second protrusion 23 and are led out at the same end of the coil 20, so that the inductor can be easily connected to an external circuit.

[0060] Furthermore, if Figures 1 to 3 As shown, the inductor further includes a base 40;

[0061] The base 40 is fixed to a side of the E-shaped magnetic core 11 away from the I-shaped magnetic core 12, or the base 40 is fixed to a side of the I-shaped magnetic core 12 away from the E-shaped magnetic core 11;

[0062] In the length extension direction of the side column 112, one end of the lead pin 21 on the base 40 close to the coil 20 exceeds the outer edge of the E-type magnetic core 11 and the I-type magnetic core 12 to form an outlet portion 41 of the base 40, and the lead pin 21 of the coil 20 passes through the outlet portion 41.

[0063] The inductor has a base 40 with one side facing the circuit board or the supporting structure, and the base 40 has an outlet portion 41, which is used to lead out the lead pin 21 of the coil 20, so that the inductor is easily connected to the circuit. Specifically, the base 40 is provided with a square through hole for the lead wire to pass through. The lead wire and the E-shaped magnetic core 11 can be fixed to the base 40 by means of gluing or other connection methods, which are not limited here.

[0064] In addition, only a portion of the wire outlet portion 41 of the base 40 exceeds the outer edge of the E-type magnetic core 11 and the I-type magnetic core 12, and the wire outlet portion 41 may be rectangular, trapezoidal, or other shapes. It can be understood that the above-mentioned limitations on the size and shape of the wire outlet portion 41 of the base 40 are only examples. In other embodiments, the wire outlet portion 41 of the base 40 may exceed the entire edge of the E-type magnetic core 11 and the I-type magnetic core 12.

[0065] Furthermore, if Figure 3 As shown, in the length extension direction of the side column 112, one end of the lead pin 21 on the base 40 away from the coil 20 also exceeds the outer edge of the E-type magnetic core 11 and the I-type magnetic core 12, forming a fixed portion 42 of the base 40; a fixing member 43 is provided on the fixing portion 42, and the fixing member 43 is used to fix the inductor to the circuit board or the supporting structure.

[0066] The fixing member 43 may be a screw, and the fixing portion 42 of the base 40 may be provided with a through hole, and the fixing member 43 passes through the through hole to thread the base 40 onto the circuit board or other supporting structure, so that the base 40 can be more stably fixed to the circuit board or supporting structure. The fixing member 43 may also be a buckle or other types of fixing members 43.

[0067] Furthermore, if Figure 5 As shown, the middle column 111 is in a rectangular parallelepiped shape, and the edges of the middle column 111 surrounding the circumference of the coil 20 are rounded.

[0068] When the coil 20 is wound, both ends are usually in an arc shape. The rounded edges on the circumferential side of the middle column 111 surrounding the coil 20 are arranged to facilitate the winding of the coil 20 so that the shape of the middle column 111 matches that of the coil 20 .

[0069] Furthermore, if Figure 2 and 4 As shown, the inductor also includes two skeletons 30 symmetrically arranged around the middle column 111, and the coil 20 is wound on the skeleton 30. The direction in which the two bottom plates 113 are relatively arranged is defined as the thickness direction of the middle column 111, and the two ends of the skeleton 30 along the thickness direction of the middle column 111 are bent toward the coil 20.

[0070] This arrangement allows the skeleton 30 to create a gap between the coil 20 and the center column 111. Specifically, the skeleton 30 creates a gap between the coil 20 and the periphery of the center column 111, so that the airflow of the air duct can pass between the coil 20 and the periphery of the center column 111, thereby increasing the heat dissipation area.

[0071] The skeleton 30 also creates gaps at both ends of the coil 20 and the middle column 111 along the length extension direction. In the length extension direction along the side column 112, the length of the skeleton 30 exceeds the length of the middle column 111, and the two ends of the skeleton 30 are bent in an arc toward the middle column 111, so that gaps are formed at both ends of the coil 20 and the middle column 111, increasing the contact area between the coil 20 and the airflow in the air duct, and also enabling the middle column 111 of the E-type magnetic core 11 to contact the airflow in the air duct, thereby increasing the heat dissipation area. Under the same load working conditions, the inductor configured in this way has strong heat dissipation capacity, small temperature rise, good performance, and long service life.

[0072] In addition, the skeleton 30 also plays a role in fixing the coil 20 . The two ends of the skeleton 30 along the thickness direction of the center column 111 are bent toward the coil 20 to limit the movement of the coil 20 in the thickness direction, so that the coil 20 is tightened.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An inductor, characterized in that: including a core pair and a coil; The magnetic core pair comprises two opposite bottom plates, two side columns connecting the two bottom plates, and a middle column, wherein the side columns are arranged at two opposite sides of the bottom plates, and the middle column is arranged between the two side columns; The bottom plate is in the shape of a flat plate; the intersection line of the bottom plate and the side column is defined as the length direction, the side column is flush with both ends of the bottom plate in the length extension direction, and the length of the middle column is less than the length of the side column and the bottom plate; The middle column, the side columns and the bottom plate are enclosed to form a coil accommodating groove; The coil is wound on the middle column; the two end faces of the middle column along the length extension direction are respectively a first end face and a second end face; the portion of the coil extending beyond the outer side of the plane where the first end face and the second end face are located are respectively a first protrusion and a second protrusion; In a direction perpendicular to the bottom plate, a projection of the first protrusion and / or the second protrusion is at least partially located within a projection of the coil accommodating groove.

2. The inductor according to claim 1, characterized in that In a direction parallel to the bottom plate, the sum of the cross-sectional areas of the two side columns is smaller than the cross-sectional area of ​​the middle column.

3. The inductor according to claim 1, characterized in that The magnetic core pair comprises an E-type magnetic core and an I-type magnetic core which are arranged opposite to each other; The E-shaped magnetic core and the I-shaped magnetic core each include a bottom plate, and the E-shaped magnetic core also includes the middle column and the two side columns arranged on the corresponding bottom plate; The middle column and each of the side columns of the E-type magnetic core are in contact with and connected to the bottom plate of the I-type magnetic core, and the E-type magnetic core and the I-type magnetic core are enclosed to form the coil accommodating groove.

4. The inductor according to claim 3, characterized in that In a direction perpendicular to the bottom plate, a projection of the first protrusion is located within a projection of the coil accommodating groove.

5. The inductor according to claim 4, characterized in that An air duct is formed between the E-shaped magnetic core, the I-shaped magnetic core and the coil, and a side of the inductor close to the first protrusion is an air inlet side of the air duct.

6. The inductor according to claim 4, characterized in that In a direction perpendicular to the base plate, the projection of the second protrusion is outside the projection of the coil accommodating groove; the second end face of the middle column is flush with an end face of the base plate along the length extension direction, and the second protrusion is provided with a lead pin of the coil.

7. The inductor according to claim 6, characterized in that The inductor also includes a base; The base is fixed to a side of the E-shaped magnetic core that is away from the I-shaped magnetic core, or the base is fixed to a side of the I-shaped magnetic core that is away from the E-shaped magnetic core; In the length extension direction of the side column, one end of the lead pin of the base close to the coil exceeds the outer edge of the E-type magnetic core and the I-type magnetic core to form an outlet portion of the base, and the lead pin of the coil passes through the outlet portion.

8. The inductor according to claim 7, characterized in that In the length extension direction of the side column, one end of the lead pin on the base away from the coil also exceeds the outer edge of the E-type magnetic core and the I-type magnetic core, forming a fixed part of the base; a fixing part is provided on the fixed part, and the fixing part is used to fix the inductor to a circuit board or a supporting structure.

9. The inductor according to claim 1, wherein: The middle column is in a rectangular parallelepiped shape, and the edges of the middle column surrounding the circumference of the coil are rounded.

10. The inductor according to claim 1, wherein: The inductor also includes two frames symmetrically arranged around the middle column, the coil is wound on the frames, the direction in which the two bottom plates are relatively arranged is defined as the thickness direction of the middle column, and the two ends of the frames along the thickness direction of the middle column are bent toward the coil.

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