Large-current-difference common-mode inductor

Abstract

The utility model relates to a large current difference common mode inductor which comprises a base and a magnetic core assembled on the base, the magnetic core is in a square shape and comprises two connecting arms arranged oppositely, a first installation arm and a second installation arm, and the first installation arm and the second installation arm are connected between the two connecting arms respectively. The outer surface of the first installation arm and the outer surface of the second installation arm are respectively and correspondingly provided with two windings formed by winding flat wires, and the positions, corresponding to the windings on the corresponding sides, of the base are provided with first pins and second pins which are used for electrically connecting the wire inlet ends and the wire outlet ends of the windings on the corresponding sides. The base is further provided with a magnetic sheet, the magnetic core is installed on the top face of the base in an attached mode, and the magnetic sheet is correspondingly arranged in the magnetic core and is adjacent to the two windings. According to the inductor provided by the embodiment of the utility model, the overall structure is simplified, the production cost is reduced, the current resistance is strong, and the inductor can cope with a large-current working environment.

Description

Technical Field

[0001] This utility model relates to the field of inductor devices, and in particular to a large current difference common-mode inductor. Background Technology

[0002] Differential and common-mode inductors are inductor devices that can filter out differential-mode and common-mode interference, and are widely used in power supply circuits, communication equipment, and other fields. The traditional manufacturing of differential and common-mode inductors mainly relies on the enameled wire winding process. The specific steps include winding the enameled wire onto a bobbin according to preset winding parameters to form a coil structure with a certain inductance and turns ratio, and then fixing the magnetic core onto the wound coil bobbin.

[0003] However, the inventors discovered in practice that as electronic products tend to be miniaturized and integrated, inductor components need to have stronger current resistance, but the current resistance of traditional enameled wire is difficult to meet this requirement; moreover, the skeleton structure design required for traditional differential and common mode inductors is complex and needs to be adapted to irregular magnetic cores, which increases the production cost of the product. Utility Model Content

[0004] Therefore, it is necessary to provide a common-mode inductor with large current difference, strong current withstand capability, optimized installation structure, and reduced production cost.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A large current difference common mode inductor includes a base and a magnetic core assembled on the base. The magnetic core is U-shaped and includes two connecting arms arranged opposite each other and a first mounting arm and a second mounting arm respectively connected between the two connecting arms. The outer surfaces of the first mounting arm and the second mounting arm are respectively provided with two windings made of flat wire. The base is provided with a first pin and a second pin at the position corresponding to the winding on the corresponding side for electrically connecting the input end and the output end of the winding on the corresponding side. The base is also provided with a magnetic sheet. The magnetic core is attached to the top surface of the base, and the magnetic sheet is placed inside the magnetic core and adjacent to the two windings.

[0006] In one embodiment, the central region of the base is further provided with a mounting platform, and the magnetic sheet is adhered to the top surface of the mounting platform by adhesive.

[0007] In one embodiment, the base is further provided with wire grooves at the positions of the inlet and outlet ends of the windings corresponding to the respective sides.

[0008] In one embodiment, the top surface of the base has a limiting step that abuts against the connecting arm, and the limiting step is further recessed to form a receiving groove for accommodating the winding.

[0009] In one embodiment, the receiving groove is an arc-shaped groove, and the bottom wall of the receiving groove is adapted to the shape of the outer contour of the winding.

[0010] In one embodiment, the end face of the receiving groove near the side end of the base is further provided with an opening.

[0011] In one embodiment, the bottom surfaces of the two connecting arms are fixed to the top surface of the base by adhesive.

[0012] In one embodiment, the base is integrally machined.

[0013] The beneficial effects of this utility model are as follows: The large current difference common-mode inductor provided by this utility model adopts a U-shaped magnetic core and directly winds two windings on the first and second mounting arms of the magnetic core. After the windings are completed, the magnetic core with assembled windings is assembled with the base. Therefore, it eliminates the need for the complex skeleton structure and irregular magnetic design of traditional methods, greatly simplifying the overall structure and effectively reducing production costs. In addition, the windings are made of flat wire, which has a large contact area between each other and less internal gap, resulting in stronger current resistance compared to traditional enameled wire. Moreover, a magnetic sheet is set between the two windings on the base for separation, which can guide the magnetic flux path and reduce leakage flux. In summary, the inductor provided by this embodiment simplifies the overall structure, reduces production costs, and has strong current resistance, enabling it to cope with high-current operating environments. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of a possible embodiment of the large current difference common-mode inductor of this utility model, showing a combined state.

[0016] Figure 2 This is a three-dimensional structural diagram of a split state of an optional embodiment of the large current difference common-mode inductor of this utility model.

[0017] In the attached diagram, 1 is the base; 11 is the first pin; 12 is the second pin; 13 is the magnetic sheet; 14 is the mounting platform; 15 is the wire channel; 17 is the limiting step; 18 is the receiving slot; 19 is the opening; 3 is the magnetic core; 31 is the connecting arm; 32 is the first mounting arm; 33 is the second mounting arm; 5 is the winding; and 50 is the flat wire. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments. The present invention is not limited to the specific embodiments described below.

[0019] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "front," "rear," "left," "right," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0020] In one embodiment, such as Figure 1 and Figure 2 As shown, a large current difference common-mode inductor includes a base 1 and a magnetic core 3 assembled on the base 1. The magnetic core 3 is U-shaped and includes two oppositely arranged connecting arms 31 and a first mounting arm 32 and a second mounting arm 33 respectively connected between the two connecting arms 31. The outer surfaces of the first mounting arm 32 and the second mounting arm 33 are respectively provided with two windings 5 ​​made of flat wire 50. The base 1 is provided with a first pin 11 and a second pin at the position corresponding to the windings 5 ​​on the corresponding side for electrically connecting the input and output ends of the windings 5 ​​on the corresponding side. The base 1 is also provided with a magnetic sheet 13. The magnetic core 3 is attached to the top surface of the base 1, and the magnetic sheet 13 is placed inside the magnetic core 3 and is arranged adjacent to the two windings 5.

[0021] Compared with the prior art, the present invention has at least the following advantages: The large current difference common-mode inductor provided by the present invention uses a U-shaped magnetic core 3, and directly winds two windings 5 ​​on the first mounting arm 32 and the second mounting arm 33 of the magnetic core 3. After the windings 5 ​​are completed, the magnetic core 3 with the assembled windings 5 ​​is assembled with the base 1. Therefore, it eliminates the need for the complex skeleton structure and irregular magnetic design of the traditional method, greatly simplifying the overall structure and effectively reducing production costs. In addition, the windings 5 ​​are also made of flat wires 50. The flat wires 50 have a large contact area between each other and few internal gaps, which has a stronger current resistance than traditional enameled wires. Moreover, a magnetic sheet 13 located on the base 1 is set between the two windings 5 ​​for separation, which can guide the magnetic flux path and reduce magnetic leakage. In summary, the inductor provided by this embodiment simplifies the overall structure, reduces production costs, and has strong current resistance, which can cope with high current working environments.

[0022] In one embodiment, such as Figure 1 and Figure 2 As shown, a mounting platform 14 protrudes outward from the middle region of the base 1, and the magnetic sheet 13 is glued to the top surface of the mounting platform 14. In this embodiment, by setting the mounting platform 14 on the base 1, the mounting platform 14 can reasonably raise the height of the magnetic sheet 13, so that the magnetic sheet 13 can just meet the requirements of separating the two windings 5 ​​and guiding the magnetic flux; in addition, it is not necessary to use too many magnetic sheets 13, which effectively reduces the consumption of raw materials of magnetic sheets 13, lowers production costs, and improves the economics of the product.

[0023] In one embodiment, such as Figure 1 and Figure 2 As shown, the base 1 also has wire-passing grooves 15 at the positions corresponding to the inlet and outlet ends of the winding 5 on the corresponding side. In this embodiment, two wire-passing grooves 15 are provided on each of the opposite sides of the base 1, so that the two wire-passing grooves on one side can provide a wiring path for the inlet and outlet ends of the winding 5 on the corresponding side. This allows the inlet and outlet ends of the winding 5 on the corresponding side to pass through the corresponding wire-passing grooves 15 and then connect precisely with the first pin 11 and the second pin 12, thus reasonably optimizing the spatial layout of the base 1 and effectively shortening the wiring distance.

[0024] In one embodiment, such as Figure 1 and Figure 2As shown, the top surface of the base 1 has a limiting step 17 that abuts against the connecting arm 31. The limiting step 17 also has a recessed receiving groove 18 for accommodating the winding 5. In this embodiment, the limiting step 17 abuts against the connecting arm 31 on the top surface of the base 1 effectively supports the magnetic core 3. Simultaneously, two receiving grooves 18 for accommodating the two windings 5 ​​are recessed on both sides of the limiting step 17, resulting in a more compact installation structure, effectively reducing the overall height of the inductor, and miniaturizing the product.

[0025] In one embodiment, such as Figure 1 and Figure 2 As shown, the receiving groove 18 is an arc-shaped groove, and the bottom wall of the receiving groove 18 is adapted to the shape of the outer contour of the winding 5. In this embodiment, an arc-shaped groove is used as the receiving groove 18, and its bottom wall is adapted to the outer contour of the winding 5, fitting the contour of the winding 5, so that the winding 5 can be smoothly embedded in the receiving groove 18, and the structure is more compact.

[0026] In one embodiment, such as Figure 1 and Figure 2 As shown, the receiving groove 18 is provided with an opening 19 on the end face of the side end near the base 1. In this embodiment, by forming an opening 19 on the corresponding side of the receiving groove 18, the heat of the winding 5 can be prevented from accumulating in the receiving groove, and the heat can be transferred to the external environment through the opening 19, resulting in good stability in use.

[0027] In one embodiment, such as Figure 1 and Figure 2 As shown, the bottom surfaces of the two connecting arms 31 are fixed to the top surface of the base 1 using adhesive. In this embodiment, the bottom surfaces of the two connecting arms 31 are fixed to the top surface of the base 1 using adhesive, which allows the magnetic core 3 to be easily fixed to the base 1 as a whole, resulting in high installation efficiency.

[0028] In one embodiment, such as Figure 1 and Figure 2 As shown, the base 1 is integrally formed. In this embodiment, the base 1 is made of plastic and integrally formed using injection molding, resulting in high overall structural strength.

[0029] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A large current differential common mode inductor comprising a base and a magnetic core assembled on the base, characterized in that, The magnetic core is in a mouth-shaped form and comprises two oppositely arranged connecting arms and a first mounting arm and a second mounting arm respectively connected between the two connecting arms, two windings respectively wound by flat wires are arranged on the outer surfaces of the first mounting arm and the second mounting arm, the base is provided with a first pin and a second pin for electrically connecting the wire-in end and the wire-out end of the winding on the corresponding side at the position corresponding to the winding on the corresponding side, a magnetic sheet is further arranged on the base, the magnetic core is attached and mounted on the top surface of the base, and the magnetic sheet is correspondingly arranged in the magnetic core and adjacent to the two windings.

2. The high current differential common mode inductor of claim 1, wherein, The middle region of the base is further provided with an outwardly protruding mounting table, and the magnetic sheet is attached to the top surface of the mounting table by adhesive.

3. The high current differential common mode inductor of claim 1, wherein, The base is further provided with a wire passing groove at the position corresponding to the wire-in end and the wire-out end of the winding on the corresponding side.

4. The high current differential common mode inductor of claim 1, wherein, The top surface of the base is provided with a limiting step abutting against the connecting arm, and the limiting step is further provided with an accommodating groove in the form of an arc-shaped groove body for accommodating the winding.

5. The high current differential mode inductor of claim 4, wherein, The accommodating groove is in the form of an arc-shaped groove body, and the groove bottom wall of the accommodating groove is matched with the shape of the outer contour of the winding.

6. The high current differential common mode inductor of claim 5, wherein, The end surface of the accommodating groove adjacent to the side end of the base is further provided with an opening.

7. The high current differential common mode inductor of claim 1, wherein, The bottom surfaces of the two connecting arms and the top surface of the base are fixed by adhesive.

8. The high current differential common mode inductor of claim 1, wherein, The base is integrally formed.

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