Semi-open type common mode inductor and preparation method

Abstract

The invention is applicable to the technical field of inductors, and provides a semi-open type common mode inductor and a preparation method thereof, and the semi-open type common mode inductor comprises a protective shell, a connecting conductive piece and a common mode magnetic core group. When the common mode inductor is installed, the protective shell can be buckled on the circuit board along the direction from the installation opening to the circuit board, and meanwhile, due to the fact that the surface-mounting part and the installation opening are both located on the installation face, the surface-mounting face can abut against a bonding pad on the circuit board after the protective shell is installed. According to the common mode inductor provided by the invention, the surface-mounted part of the connecting conductive piece is connected with the bonding pad through welding, so that the surface-mounted installation of the whole common mode inductor is realized, the installation of the inductor is more convenient and quicker, and meanwhile, the arrangement of the surface-mounted surface also increases the contact area of the connecting conductive piece and the bonding pad, so that the welding of the connecting conductive piece and the bonding pad is firmer; 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 a semi-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 a semi-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, a semi-open common-mode inductor comprises:

[0005] A protective shell, wherein the protective shell has a mounting surface, the protective shell also has a receiving cavity and a mounting opening for connecting the receiving cavity with the outside, and the mounting opening is located on the mounting surface;

[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 protective housing, the mounting portion is abutted against the mounting surface, and a side of the mounting portion facing away from the protective housing is a mounting surface, and the mounting surface is used to contact a pad on a circuit board;

[0007] The common mode magnetic core group is fixed in the accommodating cavity, 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, and 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, a mounting structure is provided on the protective shell, and the mounting portion is connected to the protective shell via the mounting structure.

[0009] In an optional embodiment, the mounting structure includes a mounting socket, and the mounting socket has a first opening and a second opening, the first opening is located on the mounting surface, the second opening is located on the surface of the protective shell other than the mounting surface, and the mounting portion is inserted into the mounting socket from the first opening and extends out from the second opening.

[0010] In an optional embodiment, a sidewall of the protective shell is further provided with an avoidance opening, and the avoidance opening is used for allowing the connection end of the winding coil to pass through, and the connection end of the winding coil is electrically connected to the mounting portion after passing through the avoidance opening.

[0011] In an optional embodiment, a sidewall of the protective shell is further provided with an avoidance opening, and the avoidance opening is used for allowing the connection end of the winding coil to pass through, and the connection end of the winding coil is electrically connected to the mounting portion after passing through the avoidance opening.

[0012] In an optional embodiment, an inner wall of the accommodating cavity opposite to the mounting opening is a mounting wall, and the common-mode magnetic core group is connected to the mounting wall.

[0013] In an optional embodiment, the accommodating cavity further includes a partition component, one end of the partition component is connected to the mounting wall, the other end of the partition component extends in a direction toward the mounting opening, the magnetic frame is mounted on the circumference of the partition component, and the two winding coils on the magnetic frame are respectively located on both sides of the partition component.

[0014] In an optional embodiment, two positioning grooves are provided on the installation wall, and the two positioning grooves are located on two side areas 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.

[0015] 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.

[0016] 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.

[0017] In a second aspect, a method for preparing a semi-open common-mode inductor is provided, comprising the following steps:

[0018] A protective shell, a flat wire and a plurality of connecting conductive members are provided, wherein the protective shell has a mounting surface, and the protective shell also has a receiving cavity and a mounting opening for connecting the receiving cavity with the outside;

[0019] The magnetic material is compacted according to a preset shape and then sintered to obtain a magnetic frame;

[0020] The flat wires are respectively wound around two different regions on the magnetic frame to obtain a common mode magnetic core group;

[0021] Connecting the mounting portion of the connecting conductive member to the protective housing, and abutting the mounting portion of the connecting conductive member against the mounting surface, and pasting the common mode magnetic core group on the inner wall of the accommodating cavity;

[0022] The connecting ends of the winding coils are welded to the corresponding connected conductive parts.

[0023] 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 installing the common mode magnetic core group into the accommodating cavity through the installation opening. In addition, a plurality of connecting conductive parts are arranged on the protective shell, and the connecting conductive parts have a mounting part and a mounting part. When the connecting conductive parts are installed, they are connected to the protective shell through the mounting part, and the mounting part abuts against the mounting surface. After the connecting conductive parts are installed, the connecting ends of the winding coils correspond to the connecting conductive parts one by one, and the connecting ends are electrically connected to the connecting conductive parts. Compared with the common-mode inductor in the prior art, when the common-mode inductor is installed, the protective shell can be buckled on the circuit board along the direction of the installation opening toward the circuit board. At the same time, since the mounting portion and the mounting opening are both located on the mounting surface, the mounting surface can also abut against the pad on the circuit board after the protective shell is installed, and then the mounting portion of the connecting conductive part 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 also increases the contact area between the connecting conductive part and the pad, making the welding of the connecting conductive part and the pad more firm, which can make the installation of the common-mode inductor more secure.

[0024] 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

[0025] 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.

[0026] Figure 1 Schematic diagram of the structure of the semi-open common mode inductor provided by the embodiment of the present invention Figure 1 ;

[0027] Figure 2 Schematic diagram of the structure of the semi-open common mode inductor provided by the embodiment of the present invention Figure 2 ;

[0028] Figure 3 The structure of the protective housing used in the embodiment of the present invention is schematically shown in FIG. Figure 1 ;

[0029] Figure 4 The structure of the protective housing used in the embodiment of the present invention is schematically shown in FIG. Figure 2 ;

[0030] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0031] Figure 6 It is a schematic structural diagram of the connecting conductive member used in the embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 1. Protective shell; 11. Accommodating cavity; 12. Installation opening; 13. Installation surface; 14. Installation structure; 141. Installation socket; 142. First opening; 143. Second opening; 144. Pressure rib; 15. Avoidance opening; 16. Installation wall; 17. Partition component; 18. Positioning groove; 2. Connecting conductive part; 21. Installation part; 22. Mounting part; 3. Common mode core group; 31. Magnetic frame; 32. Winding coil; 33. Connection end. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

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

[0037] 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.

[0038] 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.

[0039] Please refer to Figures 1 to 4 As shown, in an embodiment of the present invention, in the first aspect, a semi-open common-mode inductor is provided, and the semi-open common-mode inductor comprises a protective shell 1, a connecting conductive member 2, and a common-mode magnetic core group 3. The protective shell 1 has a mounting surface 13, and the protective shell 1 also has a receiving cavity 11 and a mounting opening 12 for connecting the receiving cavity 11 with the outside, and the mounting opening 12 is located on the mounting surface 13. There are multiple connecting conductive members 2, and the connecting conductive member 2 has a mounting portion 21 and a mounting portion 22, and the mounting portion 21 is used to be connected to the protective shell 1, and the mounting portion 22 is abutted against the mounting surface 13, and the side of the mounting portion 22 facing away from the protective shell 1 is a mounting surface, and the mounting surface is used to contact the pad on the circuit board. The common-mode magnetic core group 3 is fixed in the accommodating cavity 11. The common-mode magnetic core group 3 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 coils 32 have two connecting ends 33. The connecting ends 33 are arranged in a one-to-one correspondence with the connecting conductive parts 2, and the connecting ends 33 are electrically connected to the connecting conductive parts 2.

[0040] Specifically, the protective shell 1 refers to a component with a certain volume. The protective shell 1 is usually made of insulating material, and the base is usually made of insulating material, such as PPS (PolyphenyleneSulfide) or Bakelite, so that the base has good insulation performance and can also have good high temperature resistance and good structural strength. The base can be formed by injection molding or machining. The mounting surface 13 refers to a surface with a certain area on the protective shell 1, and the mounting surface 13 can be a flat structure or a curved structure. The accommodating cavity 11 refers to a cavity structure with a certain accommodating space arranged inside the protective shell 1, and the mounting opening 12 refers to an opening structure used to connect the accommodating cavity 11 with the outside, wherein the area of ​​the mounting opening 12 is larger than the volume of the common mode core group 3.

[0041] The connecting conductive part 2 refers to a conductor part 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, etc., 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 outside of the metal wire is provided with an insulating layer. The winding coil 32 is a core component of many electromagnetic devices. The metal wire in the winding coil 32 can generate a magnetic field when current passes through, and the change in the magnetic field will induce an electromotive force in the coil itself or an adjacent coil. By winding the metal wire around different parts of the magnetic frame 31 in a moving order, a common mode magnetic core group 3 is formed with the magnetic frame 31.

[0042] The semi-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 installing the common-mode magnetic core group 3 into the accommodating cavity 11 through the installation opening 12. In addition, a plurality of connecting conductive members 2 are arranged on the protective shell 1, and the connecting conductive members 2 have a mounting portion 21 and a mounting portion 22. When the connecting conductive members 2 are installed, they are connected to the protective shell 1 through the mounting portion 21, and the mounting portion 22 abuts against the mounting surface 13. After the connecting conductive members 2 are installed, the connecting ends 33 of the winding coils 32 correspond to the connecting conductive members 2 one by one, and the connecting ends 33 are electrically connected to the connecting conductive members 2. Compared with the common-mode inductor in the prior art, when installing the common-mode inductor, the protective shell 1 can be buckled on the circuit board along the direction of the installation opening 12 toward the circuit board. At the same time, since the mounting portion 22 and the mounting opening 12 are both located on the mounting surface 13, the mounting surface can also abut against the pad on the circuit board after the protective shell 1 is installed, and then the mounting portion 22 of the connecting conductive member 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 also increases the contact area between the connecting conductive member 2 and the pad, making the welding of the connecting conductive member 2 to the pad more firmly, which can make the installation of the common-mode inductor more firmly.

[0043] In addition, by installing the common-mode magnetic core group 3 composed of a magnetic frame 31 and two winding coils 32, and installing the common-mode magnetic core group 3 into the accommodating cavity 11 through the installation opening 12, and connecting the connecting end 33 of the winding coil 32 to the connecting conductive member 2 on the protective shell 1, a semi-open inductor structure is formed. The winding coil 32 can be protected to a certain extent by the protective shell 1 while ensuring that the inductor has a certain heat dissipation performance. It can also prevent welding slag from falling onto the common-mode magnetic core group 3 when the mounting part 22 is welded to the circuit board, thereby ensuring the overall quality of the inductor and the safety of use. At the same time, the semi-open common-mode inductor has a small number of parts, which makes the overall structure of the inductor simpler, reduces the volume of the inductor, and reduces the production cost of the inductor.

[0044] In one embodiment, see Figure 3 and Figure 4 , a mounting structure 14 is provided on the protective shell 1, and the mounting portion 21 is connected to the protective shell 1 through the mounting structure 14. Specifically, the mounting structure 14 refers to a structure used to fix an object, and the mounting structure 14 can fix the object by means of snap-on, plug-in or fastener connection. There can be multiple mounting structures 14, and the number of mounting structures 14 matches the number of connecting conductive parts 2, that is, each mounting structure 14 is installed with a connecting conductive part 2. In this embodiment, by providing the mounting structure 14 on the protective shell 1, when the connecting conductive part 2 is installed, the mounting portion 21 of the connecting conductive part 2 can be connected to the protective shell 1 through the mounting structure 14, which can make the installation of the connecting conductive part 2 more convenient and firm.

[0045] In one embodiment, see Figure 3 and Figure 4 The mounting structure 14 includes a mounting socket 141, and the mounting socket 141 has a first opening 142 and a second opening 143. The first opening 142 is located on the mounting surface 13, and the second opening 143 is located on the surface of the protective shell 1 other than the mounting surface 13. The mounting portion 21 is inserted into the mounting socket 141 from the first opening 142 and extends out from the second opening 143. Specifically, the mounting socket 141 refers to a hole structure with a certain depth, and the mounting socket 141 has a first opening 142 and a second opening 143. The first opening 142 is located on the mounting surface 13, and the second opening 143 is located on the surface of the protective shell 1 other than the mounting surface 13. The second opening 143 is usually located on the surface of the protective shell 1 opposite to the mounting surface 13. When the mounting portion 21 is connected to the protective shell 1, the mounting portion 21 and the mounting socket 141 are plugged and fixed to each other, so that the mounting portion 21 can be inserted into the mounting socket 141 from the first opening 142 and extend out from the second opening 143, which can make the installation of the connecting conductive member 2 more convenient.

[0046] In an alternative embodiment, see Figure 5 , a pressing rib 144 is also provided on the inner wall of the mounting hole 141, and the pressing rib 144 is provided along the axial direction of the mounting hole 141. Specifically, the pressing rib 144 refers to a protruding structure with a certain length, and the pressing rib 144 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 144 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 common mode inductor.

[0047] Based on the above-mentioned characteristic pressure rib 144, please refer to Figure 5 , there are multiple pressing ribs 144, and the multiple pressing ribs 144 are spaced apart from each other. Specifically, by providing multiple spaced pressing ribs 144 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 can be fixed by bonding, so that the connecting conductive member 2 can be installed more firmly.

[0048] In one embodiment, see Figure 1 , Figure 3 and Figure 4 , a sidewall of the protective shell 1 is also provided with an avoidance opening 15, and the avoidance opening 15 is used for the connection end 33 of the winding coil 32 to pass through, and the connection end 33 of the winding coil 32 is electrically connected to the mounting portion 21 after passing through the avoidance opening 15. Specifically, the avoidance opening 15 refers to an opening structure with a certain area, and the avoidance opening 15 is arranged on the sidewall of the protective shell 1 and is arranged through. In this embodiment, by providing the avoidance opening 15 on the sidewall of the protective shell 1, it is avoided that the connection end 33 of the winding coil 32 needs to extend from the mounting opening 12 to the accommodating cavity 11 and then connect to the conductive member 2, and the unevenness of the mounting surface 13 affects the installation of the entire inductor. After the common-mode core group 3 is installed in the accommodating cavity 11, the connection end 33 of the winding coil 32 can be extended to the outside of the accommodating cavity 11 through the avoidance opening 15, so that the connection end 33 of the winding coil 32 is more convenient to be electrically connected to the mounting portion 21.

[0049] In one embodiment, see Figure 3 The inner wall of the accommodating cavity 11 opposite to the mounting opening 12 is the mounting wall 16, and the common-mode magnetic core group 3 is connected to the mounting wall 16. Specifically, the mounting wall 16 refers to the inner wall of the accommodating cavity 11 opposite to the mounting opening 12, and by connecting the common-mode magnetic core group 3 to the mounting wall 16, the installation of the common-mode magnetic core group 3 can be made more convenient and quick.

[0050] It should be understood that the depth dimension of the accommodating cavity 11 is greater than the height dimension of the common-mode core group 3. When the common-mode core group 3 is connected to the mounting wall 16, it can prevent a part of the common-mode core group 3 from protruding from the protective shell 1 at the mounting opening 12, thereby making it more convenient to install the protective shell 1 on the circuit board.

[0051] In an alternative embodiment, see Figure 3 The common mode core group 3 is fixed to the mounting wall 16 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.

[0052] In one embodiment, see Figure 2 and Figure 3 The accommodating cavity 11 further includes a partition component 17, one end of which is connected to the mounting wall 16, and the other end of which extends in the direction toward the mounting opening 12. A magnetic frame 31 is mounted on the circumference of the partition component 17, and two winding coils 32 on the magnetic frame 31 are respectively located on both sides of the partition component 17. Specifically, the partition component 17 refers to a component with a certain height, and the partition component 17 can be an integrally formed structure with the base, and the partition component 17 can also be installed on the mounting wall 16 by pasting, welding, or clamping. By protruding a partition component 17 on the installation wall 16, when the common-mode core group 3 is installed in the accommodating cavity 11, the magnetic frame 31 can be mounted on the circumference of the partition component 17, and the two winding coils 32 are respectively located on both sides of the partition component 17. The two sides of the partition component 17 can respectively abut against the two winding coils 32, and the two ends of the partition component 17 can respectively abut against the inner wall of the magnetic frame 31, so that the common-mode core group 3 is limited in the depth direction along the installation wall 16 by the partition component 17, so that the common-mode core group 3 can be installed more firmly and the position of the common-mode core group 3 can be more precise.

[0053] In an alternative embodiment, see Figure 3 , the partition member 17 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 mounting wall 16 and the other end extends toward the mounting port, and the two plate surfaces of the partition plate are respectively in contact with the two winding coils 32, wherein the plate surface of the partition plate refers to the two side surfaces with the largest area on the partition plate. While positioning the common mode core group 3, the overall structure of the protective housing 1 can be made lighter, thereby reducing the overall manufacturing cost of the protective housing 1.

[0054] Based on the above feature partitions, please refer to Figure 3, the thickness of the partition plate gradually decreases along the depth direction of the accommodating cavity 11, from close to the mounting wall 16 to away from the mounting wall 16. Specifically, the thickness of the partition plate refers to the distance between the two plate surfaces of the partition plate. In this embodiment, the thickness of the partition plate is gradually reduced along the depth direction of the accommodating cavity 11 from close to the mounting wall 16 to away from the mounting wall 16. In the process of the common-mode core group 3 approaching the mounting wall 16, 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, so that the installation of the common-mode core group 3 is more convenient.

[0055] In one embodiment, see Figure 3 , two positioning grooves 18 are provided on the mounting wall 16, and the two positioning grooves 18 are located on both side areas of the partition component 17. The positioning grooves 18 are used to accommodate the winding coils 32 and to position the common-mode core group 3. Specifically, the positioning groove 18 refers to a groove structure with a certain depth. Since the winding coils 32 on the common-mode core group 3 are generally in contact with the mounting wall 16 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 coils 32, for example, an arc shape. In this embodiment, by providing the positioning grooves 18 on the mounting wall 16, on the one hand, the installation position of the common-mode core group 3 can be positioned, so that the installation position of the common-mode core group 3 is more accurate, and on the other hand, the contact area between the winding coils 32 and the mounting wall 16 is increased by the provision of the positioning grooves 18, so that the winding coils 32 and the protective housing 1 are more firmly adhered.

[0056] In one embodiment, see Figure 2, 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.

[0057] In one embodiment, see Figure 2 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.

[0058] In a second aspect, a method for preparing a semi-open common-mode inductor is provided, comprising the following steps:

[0059] A protective shell 1, a flat wire and a plurality of connecting conductive members 2 are provided. The protective shell 1 has a mounting surface 13, and the protective shell 1 also has a receiving cavity 11 and a mounting opening 12 for connecting the receiving cavity 11 with the outside.

[0060] Specifically, the protective shell 1 is generally made of insulating material, and the material of the base can be PPS (polyphenylene sulfide), which has a melting point of 285°C to 300°C. The protective shell 1 can also be made of bakelite, which also has good mechanical properties and heat resistance. The mounting surface 13 refers to a surface with a certain area on the protective shell 1, and the mounting surface 13 can be a flat structure or a curved structure. The accommodating cavity 11 refers to a cavity structure with a certain accommodating space arranged inside the protective shell 1, and the mounting opening 12 refers to an opening structure for connecting the accommodating cavity 11 with the outside, wherein the area of ​​the mounting opening 12 is greater than the volume of the common mode core group 3. Flat wire is a conductive material with a flat shape. Compared with traditional round metal wires, it has a larger width and a smaller thickness. The connecting conductive part 2 can be formed by cutting and bending the metal sheet to form the mounting portion 21 and the mounting portion 22.

[0061] The magnetic material is compacted into a preset shape and then sintered to obtain a magnetic frame 31 .

[0062] 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.

[0063] The flat conductors are respectively wound around two different regions of the magnetic frame 31 to form a common mode magnetic core assembly 3 .

[0064] 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 .

[0065] The mounting portion 21 of the connecting conductive member 2 is connected to the protective housing 1 , and the mounting portion 22 of the connecting conductive member 2 is abutted against the mounting surface 13 , and the common mode magnetic core assembly 3 is pasted on the inner wall of the accommodating cavity 11 .

[0066] Specifically, the common mode magnetic core group 3 is fixed to the protective shell 1 by adhesive bonding, and the connecting conductive member 2 can also be fixed to the protective shell 1 by adhesive bonding, and the adhesive is epoxy resin glue.

[0067] The connection end 33 of the winding coil 32 is welded to the corresponding connected conductive member 2 .

[0068] Specifically, the connection end 33 of the winding coil 32 can be directly connected to the connection conductive member 2, or a lead-out terminal 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 terminal is generally made of a conductive material, and the lead-out terminal can be made of tin bronze. The lead-out terminal can extend from the inside of the accommodating cavity 11 to the outside of the protective shell 1 through the avoidance opening 15. At the same time, the lead-out terminal can also be attached to the surface of the protective shell 1 by an adhesive, so that the setting of the lead-out terminal can be more stable and reliable.

[0069] 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.

[0070] 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. A semi-open common-mode inductor, characterized in that: include: A protective shell, wherein the protective shell has a mounting surface, the protective shell also has a receiving cavity and a mounting opening for connecting the receiving cavity with the outside, and the mounting opening is located on the mounting surface; 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 protective housing, the mounting portion is abutted against the mounting surface, and a side of the mounting portion facing away from the protective housing is a mounting surface, and the mounting surface is used to contact a pad on a circuit board; The common mode magnetic core group is fixed in the accommodating cavity, 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, and the connecting ends correspond to the connecting conductive parts one by one and are electrically connected to the connecting conductive parts.

2. The semi-open common mode inductor according to claim 1, characterized in that: The protective shell is provided with a mounting structure, and the mounting portion is connected to the protective shell through the mounting structure.

3. The semi-open common mode inductor according to claim 2, characterized in that: The mounting structure includes a mounting socket, and the mounting socket has a first opening and a second opening, the first opening is located on the mounting surface, the second opening is located on the surface of the protective shell other than the mounting surface, and the mounting portion is inserted into the mounting socket from the first opening and extends from the second opening.

4. The semi-open common mode inductor according to claim 3, characterized in that: The side wall of the protective shell is also provided with an escape opening, and the escape opening is used for allowing the connection end of the winding coil to pass through, and the connection end of the winding coil is electrically connected to the mounting portion after passing through the escape opening.

5. The semi-open common-mode inductor according to claim 1, characterized in that: The inner wall of the accommodating cavity opposite to the mounting opening is a mounting wall, and the common mode magnetic core group is connected to the mounting wall.

6. The semi-open common mode inductor according to claim 5, characterized in that: The accommodating cavity also has a partition component, one end of which is connected to the mounting wall, and the other end of which extends in the direction toward the mounting opening. The magnetic frame is mounted on the circumference of the partition component, and the two winding coils on the magnetic frame are respectively located on both sides of the partition component.

7. The semi-open common mode inductor according to claim 6, characterized in that: The installation wall is provided with two positioning grooves, the two positioning grooves are located at two side areas of the partition component, and the positioning grooves are used to accommodate the winding coils and locate the position of the common mode magnetic core group.

8. The semi-open common mode inductor according to any one of claims 1 to 7, 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 semi-open common mode inductor according to any one of claims 1 to 7, 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 a semi-open common-mode inductor, characterized in that: The steps include: A protective shell, a flat wire and a plurality of connecting conductive members are provided, wherein the protective shell has a mounting surface, and the protective shell also has a receiving cavity and a mounting opening for connecting the receiving cavity with the outside; 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 protective housing, and abutting the mounting portion of the connecting conductive member against the mounting surface, and pasting the common mode magnetic core group on the inner wall of the accommodating cavity; The connecting ends of the winding coils are welded to the corresponding connected conductive parts.

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