Open type common mode inductor and preparation method

Abstract

The invention is applicable to the technical field of inductors, and provides an open type common mode inductor and a preparation method thereof, and the open type common mode inductor comprises a base, a connecting conductive piece and a common mode magnetic core group. The common-mode magnetic core set is fixedly arranged on the second side face and comprises a magnetic frame and two winding coils, the two winding coils are wound at different positions of the magnetic frame, each winding coil is provided with two connecting ends, and the connecting ends correspond to the connecting conductive pieces in a one-to-one mode and are electrically connected with the connecting conductive pieces. When the common mode inductor is installed, the surface-mounted surface on the connecting conductive piece can abut against a bonding pad of a circuit board, and then the surface-mounted part of the connecting conductive piece is connected with the bonding pad in a welding mode, so that surface-mounted installation of the whole common mode inductor is achieved, installation of the common mode inductor can be more convenient and faster, and installation efficiency is improved. Meanwhile, due to the arrangement of the mounting surface, the contact area of the connecting conductive piece and the bonding pad is increased, so that the connecting conductive piece and the bonding pad are welded more firmly, and the common-mode inductor can be installed more firmly.

Description

Technical Field

[0001] The invention belongs to the technical field of inductors, and in particular relates to an open common-mode inductor and a preparation method thereof. Background Art

[0002] Inductors are one of the three major passive components in electronic circuits. They mainly play the role of filtering, oscillating, delaying, trapping, screening signals, filtering noise, stabilizing current, and suppressing electromagnetic interference in circuits. With the rapid development of electronic technology, especially the rapid popularization of mobile consumer electronic terminals, inductor devices are developing in the direction of miniaturization, lightness, high frequency, high current, high efficiency, and low EMI. At present, most existing inductors are installed by pin plug-in, which makes the inductor inconvenient to install. Summary of the invention

[0003] The object of the present invention is to provide an open common mode inductor and a preparation method thereof, aiming to solve the technical problem of inconvenient installation of the common mode inductor in the prior art when in use.

[0004] The present invention is implemented in this way. In a first aspect, an open common-mode inductor is provided, comprising:

[0005] A base having a first side surface and a second side surface arranged opposite to each other;

[0006] A plurality of connecting conductive members, each of which has a mounting portion and a mounting portion, wherein the mounting portion is used to be connected to the base, the mounting portion is abutted against the first side surface, a side of the mounting portion facing away from the base is a mounting surface, and the mounting surface is used to contact a pad on a circuit board, and

[0007] The common mode magnetic core group is fixed on the second side, and includes a magnetic frame and two winding coils. The two winding coils are wound at different positions of the magnetic frame. The winding coils have two connecting ends. The connecting ends correspond to the connecting conductive parts one by one and are electrically connected to the connecting conductive parts.

[0008] In an optional embodiment, after the connecting conductive members are mounted to the base, the mounting surfaces of the plurality of connecting conductive members are all in the same plane.

[0009] In an optional embodiment, the first side surface also has a plurality of supporting protrusions, and the plurality of supporting protrusions are all arranged to protrude from the first side surface. The plurality of supporting protrusions are arranged one-to-one correspondingly to the plurality of connecting conductive parts. The end of the supporting protrusion facing away from the base has a clamping support surface, and the mounting portion abuts against the clamping support surface.

[0010] In an optional embodiment, a mounting structure is provided on the supporting protrusion, and the mounting portion is connected to the supporting protrusion via the mounting structure.

[0011] In an optional embodiment, the mounting structure includes a mounting socket disposed on the supporting protrusion, both ends of the mounting socket are open, and the mounting portion is inserted into the mounting socket and passes through the supporting protrusion through the mounting socket.

[0012] In an optional embodiment, a partition component is provided on the base, the partition component is protruded from the second side surface, the magnetic frame is sleeved on the circumference of the partition component, and the two winding coils are respectively located on both sides of the partition component.

[0013] In an optional embodiment, two positioning grooves are further provided on the second side surface, and the two positioning grooves are respectively located on both sides of the partition component, and the positioning grooves are used to accommodate the winding coil and locate the position of the common mode magnetic core group.

[0014] In an optional embodiment, the winding coil is formed by winding a flat wire, the cross-section of the flat wire is rectangular, and after the flat wire is wound, the thickness of the flat wire is set along the axial direction of the winding coil, and the width of the flat wire is set along the radial direction of the winding coil, and the winding coil is a single-layer structure in the radial direction.

[0015] In an optional embodiment, the connecting conductive member is a plate-like structure, and the plate-like structure is bent to form the mounting portion and the mounting portion.

[0016] In a second aspect, a method for preparing an open common-mode inductor is provided, comprising the following steps:

[0017] A base, a flat wire and a plurality of connecting conductive members are provided, wherein the base has a first side surface and a second side surface arranged opposite to each other, and the connecting conductive member has a mounting portion and a mounting portion;

[0018] The magnetic material is compacted according to a preset shape and then sintered to obtain a magnetic frame;

[0019] The flat wires are respectively wound around two different regions on the magnetic frame to obtain a common mode magnetic core group;

[0020] Connecting the mounting portion of the connecting conductive member to the base, and the mounting portion of the connecting conductive member abuts against the first side surface of the base, and pasting the common mode magnetic core group to the first side surface of the base;

[0021] The connecting ends of the winding coils are welded to the corresponding connected conductive parts.

[0022] The technical effect of the present invention relative to the prior art is: by winding two winding coils at different positions of the magnetic frame to form a common mode magnetic core group, and then fixing the common mode magnetic core group on the second side of the base. A plurality of connecting conductive parts are arranged on the base, and the connecting conductive parts have a mounting part and a mounting part, the mounting part is used to connect with the base, the mounting part abuts against the first side, and the side of the mounting part away from the base is the mounting surface. At the same time, the connecting end of the winding coil is corresponded to the connecting conductive part one by one and electrically connected. Compared with the common mode inductor in the prior art, when the common mode inductor is installed, the mounting surface on the connecting conductive part can be abutted against the pad of the circuit board, and then the mounting part of the connecting conductive part is connected to the pad by welding, so as to realize the surface mounting of the entire common mode inductor, which can make the installation of the inductor more convenient and quick, and at the same time, the setting of the mounting surface also increases the contact area between the connecting conductive part and the pad, so that the welding of the connecting conductive part and the pad is more firm, so that the installation of the common mode inductor can be more firm.

[0023] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 Schematic diagram of the structure of an open common-mode inductor provided in an embodiment of the present invention Figure 1 ;

[0026] Figure 2 Schematic diagram of the structure of an open common-mode inductor provided in an embodiment of the present invention Figure 2 ;

[0027] Figure 3 The structure of the base used in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 4 The structure of the base used in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0030] Figure 6 It is a schematic structural diagram of the connecting conductive member used in the embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Base; 11. First side; 12. Second side; 13. Support protrusion; 131. Pressing support surface; 14. Mounting structure; 141. Mounting socket; 15. Partition component; 16. Accommodating groove; 17. Pressing rib; 18. Positioning groove; 2. Connecting conductive part; 21. Mounting part; 22. Mounting part; 221. Mounting surface; 3. Common mode core group; 31. Magnetic frame; 32. Winding coil; 33. Connection end. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which 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 present invention, and should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] 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 invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] Please refer to Figures 1 to 4 As shown, in an embodiment of the present invention, in the first aspect, an open common-mode inductor is provided, and the open common-mode inductor includes a base 1, a connecting conductive member 2, and a common-mode magnetic core group 3. The base 1 has a first side surface 11 and a second side surface 12 arranged opposite to each other. There are multiple connecting conductive members 2, and the connecting conductive member 2 has a mounting portion 21 and a mounting portion 22. The mounting portion 21 is used to be connected to the base 1, and the mounting portion 22 abuts against the first side surface 11. The side of the mounting portion 22 facing away from the base 1 is a mounting surface 221, and the mounting surface 221 is used to contact the pad on the circuit board. The common-mode magnetic core group 3 is fixed on the second side surface 12, and includes a magnetic frame 31 and two winding coils 32. The two winding coils 32 are wound at different positions of the magnetic frame 31. The winding coil 32 has two connection ends 33, and the connection ends 33 correspond to the connecting conductive member 2 one by one and are electrically connected to the connecting conductive member 2.

[0039] Specifically, the base 1 refers to a component with a certain volume. The base 1 is usually made of insulating material, such as PPS (PolyphenyleneSulfide) or bakelite, so that the base 1 has good insulation performance and can also have good high temperature resistance and good structural strength. The base 1 can be formed by injection molding or machining. The connecting conductive part 2 refers to a conductor component with a certain volume, such as a metal material with good conductivity such as gold, silver or copper. The connecting conductive part 2 can be block-shaped, plate-shaped or column-shaped, and the connecting conductive part 2 can also be a combination of multiple shapes. The magnetic frame 31 refers to a structural component that plays a key supporting and magnetic guiding role in electromagnetic equipment. It is mainly used to fix the coil winding and provide a low magnetic resistance path for the magnetic flux, so that the magnetic field can be more effectively concentrated and guided, thereby enhancing the performance of the electromagnetic equipment. The overall shape of the magnetic frame 31 is usually a closed frame structure. The winding coil 32 refers to a coil structure formed by winding a metal wire according to certain rules and turns. The winding coil 32 with an insulating layer on the outside of the metal wire is the core component of many electromagnetic devices. The metal wire in the winding coil 32 can generate a magnetic field when current passes through it, and the change of the magnetic field will induce an electromotive force in the coil itself or an adjacent coil. The winding coil 32 is wound around different parts of the magnetic frame 31 to form a common mode magnetic core group 3. The common mode magnetic core group 3 as a whole can be fixed to the second side 12 of the base 1 by means of clamping, bonding or fastener fixing.

[0040] The open common-mode inductor provided in the embodiment of the present invention is formed by winding two winding coils 32 at different positions of the magnetic frame 31 to form a common-mode magnetic core group 3, and then the common-mode magnetic core group 3 is fixed on the second side 12 of the base 1. A plurality of connecting conductive members 2 are arranged on the base 1, and the connecting conductive members 2 have a mounting portion 21 and a mounting portion 22, the mounting portion 21 is used to connect with the base 1, the mounting portion 22 abuts against the first side 11, and the side of the mounting portion 22 facing away from the base 1 is a mounting surface 221. At the same time, the connecting ends 33 of the winding coils 32 correspond to the connecting conductive members 2 one by one and are electrically connected. Compared with the common-mode inductor in the prior art, when installing the common-mode inductor, the mounting surface 221 on the connecting conductive part 2 can be abutted against the pad of the circuit board, and then the mounting portion 22 of the connecting conductive part 2 is connected to the pad by welding, thereby realizing the surface-mount installation of the entire common-mode inductor, which can make the installation of the inductor more convenient and quick. At the same time, the setting of the mounting surface 221 also increases the contact area between the connecting conductive part 2 and the pad, making the welding of the connecting conductive part 2 and the pad more firmly, thereby making the installation of the common-mode inductor more firmly.

[0041] In addition, by installing the common mode magnetic core group 3 composed of the magnetic frame 31 and the two winding coils 32 on the second side 12 of the base 1, and connecting the connecting end 33 of the winding coil 32 to the connecting conductive member 2 on the base 1, an overall open inductor structure is formed, so that the overall heat dissipation of the inductor is better. At the same time, due to the small number of parts of the inductor, the overall structure of the inductor is simpler, the volume of the inductor is reduced, and the production cost of the inductor is reduced.

[0042] In one embodiment, see Figure 2 , after the connecting conductive member 2 is installed on the base 1, the mounting surfaces 221 of the multiple connecting conductive members 2 are all in the same plane. Specifically, the above-mentioned plane can be set parallel to the first side surface 11 of the base 1. By making the mounting surfaces 221 of the multiple connecting conductive members 2 in the same plane, the height difference between the mounting surfaces 221 can be avoided. And because the pads on the circuit board are generally in the same plane, when the common-mode inductor is installed on the circuit board by surface mounting, by making the mounting surfaces 221 of the multiple connecting conductive members 2 in the same plane, when the mounting surface 221 of one of the connecting conductive members 2 contacts the pad on the circuit board, the mounting surfaces 221 of the other connecting conductive members 2 will also contact the pad on the circuit board, so that the entire base 1 can be connected to the circuit board more conveniently by surface mounting, and the installation of the inductor is more stable.

[0043] In one embodiment, see Figure 4, the first side surface 11 also has a plurality of supporting protrusions 13, the plurality of supporting protrusions 13 are all protruding from the first side surface 11, the plurality of supporting protrusions 13 are arranged one by one with the plurality of connecting conductive members 2, the end of the supporting protrusion 13 away from the base 1 has a pressing support surface 131, and the mounting portion 22 abuts against the pressing support surface 131. Specifically, the supporting protrusion 13 refers to a protruding structure with a certain height, and the supporting protrusion 13 can be a block, a column or a plate. The supporting protrusion 13 can be an integrally formed structure with the base 1, and the supporting protrusion 13 can also be an additional component installed on the first side surface 11 by welding, bonding or clamping. The pressing support surface 131 refers to a surface structure with a certain area, and the pressing support surface 131 can be a plane structure or a curved surface structure. In this embodiment, by further providing a plurality of supporting protrusions 13 on the first side surface 11, the plurality of supporting protrusions 13 are arranged one by one with the plurality of connecting conductive members 2. And a clamping support surface 131 is provided at one end of the supporting protrusion 13 facing away from the base 1. When installing the connecting conductive member 2, the mounting portion 21 of the connecting conductive member 2 can be installed on the base 1 or the supporting protrusion 13, and the mounting portion 22 of the connecting conductive member 2 can be abutted against the clamping support surface 131. The mounting portion 22 can be spaced apart from the first side surface 11 by the support of the supporting protrusion 13, leaving space for the welding installation of the mounting portion 22, avoiding the base 1 from blocking the connection between the mounting portion 22 and the pad on the circuit board, making the installation of the inductor more convenient. In addition, after the connecting conductive member 2 is installed, the mounting portion 22 of the connecting conductive member 2 can be pressed by the clamping support surface 131, so that the mounting portion 22 of the connecting conductive member 2 is smoother and the mounting portion 22 is fixed more firmly.

[0044] In an alternative embodiment, see Figure 4 The supporting protrusion 13 and the base 1 are an integrally formed structure. Specifically, for example, when the base 1 is made of materials such as PPS or bakelite, the supporting protrusion 13 and the base 1 can be integrally formed by injection molding, which can make the installation of the supporting protrusion 13 more firm and reliable.

[0045] In one embodiment, see Figure 4 and Figure 5, a mounting structure 14 is provided on the supporting protrusion 13, and the mounting portion 21 is connected to the supporting protrusion 13 through the mounting structure 14. Specifically, the mounting structure 14 refers to a structure for fixing an object, and the mounting structure 14 can fix the object by means of snap-on, plug-in or fastener connection. In this embodiment, when the connecting conductive member 2 is installed, the mounting portion 21 of the connecting conductive member 2 can be connected to the supporting protrusion 13 through the mounting structure 14. Firstly, since the volume of the supporting protrusion 13 is smaller than the volume of the base 1, by setting the mounting structure 14 on the supporting protrusion 13, the processing difficulty of the mounting structure 14 can be reduced, thereby reducing the overall manufacturing cost of the base 1. Secondly, the mounting structure 14 is arranged on the supporting protrusion 13 so that the mounting structure 14 can be closer to the clamping support surface 131 on the supporting protrusion 13. At this time, when the mounting portion 21 is fixed by the mounting structure 14 and the mounting portion 22 is abutted against the clamping support surface 131, the mounting structure 14 is arranged at a position close to the clamping support surface 131, which can reduce the distance between the mounting portion 21 and the mounting portion 22 of the connecting conductive member 2, thereby reducing the overall volume of the connecting conductive member 2.

[0046] In one embodiment, see Figure 5 , the mounting structure 14 includes a mounting socket 141 disposed on the supporting protrusion 13, the two ends of the mounting socket 141 are open, and the mounting portion 21 is inserted and disposed in the mounting socket 141, and penetrates the supporting protrusion 13 through the mounting socket 141. Specifically, the mounting socket 141 refers to a hole structure with a certain depth, and the two ends of the mounting socket 141 are open, so that the mounting socket 141 forms a through-hole structure that penetrates the entire supporting protrusion 13. In this embodiment, the mounting socket 141 can be arranged in a direction parallel to the pressing support surface 131. When the connecting conductive member 2 is installed, the mounting portion 21 of the connecting conductive member 2 can be inserted into the mounting socket 141 from one end opening of the mounting socket 141, and extended from the other end opening of the mounting socket 141 to form a connecting end 33 connected to the winding coil 32. At this time, the mounting portion 22 of the connecting conductive member 2 can abut against the pressing support surface 131 at the same time, making the installation of the connecting conductive member 2 more convenient.

[0047] In an alternative embodiment, see Figure 5 , a pressing rib 17 is also provided on the inner wall of the mounting hole 141, and the pressing rib 17 is provided along the axial direction of the mounting hole 141. Specifically, the pressing rib 17 refers to a protruding structure with a certain length, and the pressing rib 17 is convexly provided on the inner wall of the mounting hole 141. After the mounting portion 21 of the connecting conductive member 2 is inserted into the mounting hole 141, the pressing rib 17 abuts against the side surface of the connecting conductive member 2, so that the connecting conductive member 2 is inserted into the mounting hole 141 more firmly and reliably, thereby improving the safety of the inductor.

[0048] Based on the above-mentioned characteristic pressing rib 17, please refer to Figure 5 , the number of the pressing ribs 17 is multiple, and the multiple pressing ribs 17 are spaced apart. Specifically, by providing multiple spaced pressing ribs 17 on the inner wall of the mounting socket 141, after the connecting conductive member 2 is inserted into the mounting socket 141, an accommodation gap can be formed between the connecting conductive member 2 and the mounting socket 141, and the accommodation gap can be used to accommodate adhesive, so that the connecting conductive member 2 and the supporting protrusion 13 can be fixed by bonding, so that the connecting conductive member 2 can be installed more firmly.

[0049] In one embodiment, see Figure 1 The common mode core group 3 is fixed to the second side surface 12 of the base 1 by adhesive. Specifically, the adhesive refers to a substance that can connect two or more objects together by surface adhesion. The adhesive can be epoxy resin glue. The common mode core group 3 is fixed by adhesive, which can make the installation of the common mode core group 3 more convenient on the basis of firmly fixing the common mode core group 3.

[0050] In one embodiment, see Figure 1 and Figure 3 , a partition member 15 is provided on the base 1, the partition member 15 is convexly provided on the second side surface 12, the magnetic frame 31 is mounted on the circumference of the partition member 15, and the two winding coils 32 are respectively located on both sides of the partition member 15. Specifically, the partition member 15 refers to a member with a certain height, and the partition member 15 can be an integrally formed structure with the base 1, and the partition member 15 can also be installed on the second side surface 12 by pasting, welding or clamping connection. By convexly providing the partition member 15 on the second side surface 12 of the base 1, when the common mode magnetic core group 3 is installed on the second side surface 12 of the base 1, the magnetic frame 31 can be mounted on the circumference of the partition member 15, and the two winding coils 32 are respectively located on both sides of the partition member 15, and the two sides of the partition member 15 can be respectively abutted on the two winding coils 32, and the two ends of the partition member 15 can be respectively abutted on the inner wall of the magnetic frame 31, so that the common mode magnetic core group 3 is limited in the direction parallel to the second side surface 12 by the partition member 15, so that the common mode magnetic core group 3 is installed more firmly.

[0051] In an alternative embodiment, see Figure 3 , the partition component 15 is a partition plate. Specifically, the partition plate refers to a plate-like structure with a certain thickness, and one side of the partition plate is connected to the first side surface 11 of the base 1, and the two plate surfaces of the partition plate are respectively in contact with the two winding coils 32, wherein the plate surface refers to the two sides with the largest area on the partition plate. At the same time, the two ends of the partition plate are respectively in contact with the inner wall of the magnetic frame 31, which can make the overall structure of the base 1 lighter while positioning the common mode magnetic core group 3, reducing the manufacturing cost.

[0052] Based on the above feature partitions, please refer to Figure 3 , the thickness of the partition plate gradually decreases from close to the second side surface 12 to away from the second side surface 12 in the direction perpendicular to the second side surface 12. Specifically, the thickness of the partition plate refers to the distance between the two plate surfaces of the partition plate. In the direction perpendicular to the second side surface 12, by gradually reducing the thickness of the partition plate from close to the second side surface 12 to away from the second side surface 12, as the common mode core group 3 approaches the second side surface 12, the abutment between the plate surface of the partition plate and the winding coil 32 will become closer and closer, rather than being very close from the beginning, making the installation of the common mode core group 3 more convenient.

[0053] In one embodiment, see Figure 3 , two positioning grooves 18 are also provided on the second side surface 12, and the two positioning grooves 18 are respectively located on both sides of the partition component 15. The positioning grooves 18 are used to accommodate the winding coil 32 and locate the position of the common-mode core group 3. Specifically, the positioning groove 18 refers to a groove structure with a certain depth. Since the winding coil 32 on the common-mode core group 3 is generally in contact with the second side surface 12 when the common-mode core group 3 is installed, the bottom surface shape of the positioning groove 18 can match the shape of the winding coil 32, for example, an arc shape. In this embodiment, by providing the positioning groove 18 on the second side surface 12, on the one hand, the installation position of the common-mode core group 3 can be located, so that the installation position of the common-mode core group 3 is more accurate. On the other hand, the contact area between the winding coil 32 and the base 1 is increased by providing the positioning groove 18, so that the adhesion between the winding coil 32 and the base 1 is more firmly.

[0054] In an alternative embodiment, see Figure 3 , a receiving groove 16 is provided on the side of the base 1, and the receiving groove 16 is used to receive the connection end 33 of the winding coil 32. Specifically, the receiving groove 16 refers to a groove structure with a certain depth. By providing the receiving groove 16 on the side of the base 1, when the connection end 33 of the winding coil 32 is welded to the connecting conductive member 2, the connection end 33 of the winding coil 32 can be arranged in the receiving groove 16, so as to avoid the connection end 33 of the winding coil 32 protruding from the base 1, thereby making the overall appearance of the common mode inductor neater.

[0055] In one embodiment, see Figure 1, the winding coil 32 is wound by a flat wire, the cross section of the flat wire is rectangular, after the flat wire is wound, the thickness of the flat wire is set along the axial direction of the winding coil 32, the width of the flat wire is set along the radial direction of the winding coil 32, and the winding coil 32 is a single-layer structure in the radial direction. Specifically, the flat wire is also called a flat cable or a flat wire, which is a conductive material with a flat appearance. Compared with the traditional round wire, it has a larger width and a smaller thickness. The main body of the flat wire is usually made of metal, and the outside of the flat wire is usually provided with an insulating layer. The material of the insulating layer can be a polyester imide enamel film material, which can make the flat wire have better insulation and extend the service life. In this embodiment, by using a flat wire to wind the winding coil 32, and the thickness of the flat wire is set along the axial direction of the winding coil 32, and the width of the flat wire is set along the radial direction of the winding coil 32, more turns can be wound per unit length, so that the inductor can have a larger working power. In addition, the winding coil 32 wound by the flat wire can make the effective cross-sectional area of ​​the common mode inductor larger, and the skin effect at high frequency is less affected. Thirdly, the winding coil 32 is a single-layer structure in the radial direction, which can effectively avoid the interlayer proximity effect of the winding coil 32 and reduce the influence of the parasitic capacitance of the inductor, thereby improving the overall performance of the common-mode inductor.

[0056] In one embodiment, see Figure 2 and Figure 6 The connecting conductive member 2 is a plate-like structure, and the plate-like structure is bent to form the mounting portion 21 and the mounting portion 22. Specifically, by making the connecting conductive member 2 into a plate-like structure and bending the connecting conductive member 2 to form the mounting portion 21 and the mounting portion 22, the overall structure of the connecting conductive member 2 can be made more solid and reliable, and the manufacturing of the connecting conductive member 2 can be made simpler and more convenient.

[0057] In a second aspect, a method for preparing an open common-mode inductor is provided, comprising the following steps:

[0058] A base 1 , a flat wire and a plurality of connecting conductive members 2 are provided. The base 1 has a first side surface 11 and a second side surface 12 which are arranged opposite to each other. The connecting conductive member 2 has a mounting portion 21 and a mounting portion 22 .

[0059] Specifically, the base 1 is generally made of insulating material. The material of the base 1 can be PPS (polyphenylene sulfide), which has a melting point of 285°C to 300°C. The base 1 can also be made of bakelite, which also has good mechanical properties and heat resistance. The first side 11 and the second side 12 refer to the two sides with larger areas on the base 1. The first side 11 can be the bottom surface of the base 1, and the second side 12 can be the top surface of the base 1. Flat wire is a conductive material with a flat shape. Compared with traditional round wires, it has a larger width and a smaller thickness. The connecting conductive part 2 can be formed by cutting and bending the metal plate to form a mounting portion 21 and a mounting portion 22.

[0060] The magnetic material is compacted according to a preset shape and then sintered to obtain a magnetic frame 31;

[0061] Specifically, the magnetic material and the doping material are mixed in a certain ratio, the mixed material is compacted through a mold, and then sintered at a high temperature. The magnetic material can be a magnetic material with high saturation magnetic induction intensity, high Curie temperature, and high power. The mixing ratio of the magnetic material and the doping material is well known to those skilled in the art and will not be described in detail here.

[0062] The flat wires are respectively wound around two different regions of the magnetic frame 31 to obtain a common mode magnetic core set 3;

[0063] Specifically, the flat wire can be wound around two different areas of the magnetic frame 31 by a winding device to form two winding coils 32 . The two winding coils 32 and the magnetic frame 31 form a common-mode magnetic core group 3 .

[0064] The mounting portion 21 of the connecting conductive member 2 is connected to the base 1 , and the mounting portion 22 of the connecting conductive member 2 is in contact with the first side surface 11 of the base 1 , and the common mode magnetic core group 3 is attached to the first side surface 11 of the base 1 ;

[0065] Specifically, the common mode magnetic core group 3 can be fixed to the base 1 by adhesive, and the connecting conductive member 2 can also be fixed to the base 1 by adhesive, and the adhesive is epoxy resin glue.

[0066] The connection end 33 of the winding coil 32 is welded to the corresponding connected conductive member 2 .

[0067] Specifically, the connection end 33 of the winding coil 32 can be directly connected to the connection conductive member 2, or a lead-out end can be provided between the connection end 33 of the winding coil 32 and the connection conductive member 2 to connect to the connection conductive member 2, wherein the lead-out end is generally made of a conductive material, and the lead-out end can be made of tin bronze. The lead-out end can also be attached to the side of the base 1 by an adhesive, so that the setting of the lead-out end can be more stable and reliable.

[0068] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementations of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. An open common mode inductor, characterized in that: include; A base having a first side surface and a second side surface arranged opposite to each other; A plurality of connecting conductive members, each of which has a mounting portion and a mounting portion, wherein the mounting portion is used to be connected to the base, the mounting portion is in contact with the first side surface, and a side of the mounting portion facing away from the base is a mounting surface, and the mounting surface is used to contact a pad on a circuit board; and The common mode magnetic core group is fixed on the second side, and includes a magnetic frame and two winding coils. The two winding coils are wound at different positions of the magnetic frame. The winding coils have two connecting ends. The connecting ends correspond to the connecting conductive parts one by one and are electrically connected to the connecting conductive parts.

2. The open common mode inductor according to claim 1, characterized in that After the connecting conductive members are mounted on the base, the mounting surfaces of the plurality of connecting conductive members are all located in the same plane.

3. The open common mode inductor according to claim 2, characterized in that The first side surface also has a plurality of supporting protrusions, which are all protruding from the first side surface, and are arranged one-to-one with the plurality of connecting conductive parts. The end of the supporting protrusion facing away from the base has a clamping support surface, and the mounting portion abuts against the clamping support surface.

4. The open common mode inductor according to claim 3, characterized in that The supporting protrusion is provided with a mounting structure, and the mounting portion is connected to the supporting protrusion through the mounting structure.

5. The open common mode inductor according to claim 4, characterized in that The mounting structure comprises a mounting socket arranged on the supporting protrusion, both ends of the mounting socket are open, the mounting part is inserted into the mounting socket and penetrates the supporting protrusion through the mounting socket.

6. The open common mode inductor according to any one of claims 1 to 5, characterized in that: A partition component is arranged on the base, the partition component is protruded on the second side surface, the magnetic frame is sleeved on the circumference of the partition component, and the two winding coils are respectively located on both sides of the partition component.

7. The open common mode inductor according to claim 6, characterized in that Two positioning grooves are also arranged on the second side surface. The two positioning grooves are respectively located on two sides of the partition component. The positioning grooves are used to accommodate the winding coils and locate the position of the common mode magnetic core group.

8. The open common mode inductor according to any one of claims 1 to 5, characterized in that: The winding coil is formed by winding a flat wire, the cross-section of the flat wire is rectangular, and after the flat wire is wound, the thickness of the flat wire is set along the axial direction of the winding coil, and the width of the flat wire is set along the radial direction of the winding coil. The winding coil is a single-layer structure in the radial direction.

9. The open common mode inductor according to any one of claims 1 to 5, characterized in that: The connecting conductive member is a plate-shaped structure, and the plate-shaped structure is bent to form the mounting portion and the mounting portion.

10. A method for preparing an open common-mode inductor, characterized in that: The steps include: A base, a flat wire and a plurality of connecting conductive members are provided, wherein the base has a first side surface and a second side surface arranged opposite to each other, and the connecting conductive member has a mounting portion and a mounting portion; The magnetic material is compacted according to a preset shape and then sintered to obtain a magnetic frame; The flat wires are respectively wound around two different regions on the magnetic frame to obtain a common mode magnetic core group; Connecting the mounting portion of the connecting conductive member to the base, and the mounting portion of the connecting conductive member abuts against the first side surface of the base, and pasting the common mode magnetic core group to the first side surface of the base; The connecting ends of the winding coils are welded to the corresponding connected conductive parts.

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