Common mode inductor with inner and outer step annular structure

Abstract

The invention discloses a common mode inductor with an inner and outer step annular structure, relates to the technical field of common mode inductors, and aims to solve the problem that a traditional pure circular magnetic ring common mode inductor cannot guarantee product consistency in the winding process. The four protruding steps with the height being about 1 mm are additionally arranged on the inner side and the outer side of the magnetic core respectively, the magnetic ring is equally divided into four symmetrical winding intervals, two coils of the common mode inductor are equally divided into four coils, the fixed distance is kept, and the product consistency is improved. In addition, the step design increases the surface area of the magnetic core, enhances the heat dissipation performance and reduces the temperature rise; meanwhile, the weight of the magnetic core is increased, the inductance value is improved, and the EMI effect is better. The common-mode inductor has the advantages of being novel in structure, accurate in winding, good in consistency, high in heat dissipation performance, high in inductance value and remarkable in EMI suppression effect, is suitable for the electronic field of high-efficiency and high-power switching power supplies and the like, and provides stable and reliable electromagnetic compatibility protection for circuits.

Description

Technical Field

[0001] The invention relates to the technical field of common-mode inductors, and in particular to a common-mode inductor with an inner and outer stepped ring structure. Background Art

[0002] As an important electromagnetic compatibility (EMC) component, common mode inductors are widely used in various power and signal lines to suppress common mode interference and improve the stability and reliability of circuits. Traditional common mode inductors mostly use pure circular magnetic rings as their core components. This pure circular magnetic ring has a simple design and relatively low manufacturing cost, so it meets basic application requirements to a certain extent.

[0003] However, with the continuous advancement of electronic technology and the increasing requirements for power efficiency, especially in the application of high-efficiency and high-power switching power supplies, the traditional pure circular magnetic ring common-mode inductor has gradually exposed some shortcomings. In order to improve the impedance and efficiency of the common-mode inductor and improve the electromagnetic interference (EMI) suppression effect, the inductor often needs to adopt the cross winding method. The cross winding method is a special winding layout method, which requires the inductor coil to be divided into two parts, which are wound along two perpendicular directions of the magnetic ring, so that the two parts of the coil form a cross on the magnetic ring.

[0004] However, since the pure circular core has no steps or separation structures, it is impossible to accurately control the spacing between the 1 / 2 coil of each winding and the other 1 / 2 coil during the winding process. This inconsistency in spacing will cause fluctuations in the electrical performance parameters of the inductor (such as impedance, inductance, etc.), thus affecting the consistency and stability of the product. In addition, inaccurate spacing may also cause changes in the electromagnetic coupling effect between the coils, further affecting the EMI suppression effect of the inductor.

[0005] Therefore, in order to overcome the shortcomings of traditional pure circular magnetic ring common-mode inductors in the winding process, improve the consistency and stability of the product, and at the same time meet the high requirements of high-efficiency and high-power switching power supplies for common-mode inductor performance, it is necessary to develop a new type of common-mode inductor with inner and outer step ring structure. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a common-mode inductor with an inner and outer stepped ring structure, which solves the problems raised by the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a common-mode inductor with an inner and outer step ring structure, comprising a magnetic core, a first coil winding, a second coil winding and a PCB board, wherein the outer edge and the inner edge of the magnetic core are respectively provided with equidistantly distributed outer convex steps and inner convex steps, the magnetic core is divided into four winding sections, the first coil winding and the second coil winding are respectively wound in two opposite winding sections to achieve uniform distribution of the four coils, and the magnetic core, the first coil winding and the second coil winding are fixed as a whole on the PCB board.

[0008] Furthermore, the outer convex step and the inner convex step are integrally formed with the magnetic core, and the height of each step is 1 mm, the width of the outer convex step is 2.4 mm, and the width of the inner convex step is 1.16 mm.

[0009] Furthermore, the common mode inductor further includes: The partition is arranged between the first coil winding and the second coil winding and is fixed between two opposite inner convex steps through a snap-fit ​​structure to avoid mutual interference.

[0010] Furthermore, the engaging structure includes a limiting groove provided at the end of the inner convex step, a clamping groove located inside the limiting groove, and a clamping protrusion at the end of the partition, and the clamping groove and the clamping protrusion are mutually adapted hemispherical structures.

[0011] Furthermore, pins are provided at the bottom of the first coil winding and the second coil winding, and reserved holes matching the pins are reserved on the PCB board, and the pins are inserted into the reserved holes and extend to the bottom of the PCB board.

[0012] Furthermore, a glue seat is coated between the bottom of the magnetic core and the upper surface of the PCB board, which is used to bond and fix the magnetic core to the PCB board.

[0013] Furthermore, the provision of the outer convex step and the inner convex step enables the first coil winding and the second coil winding to maintain a fixed distance, thereby ensuring product consistency.

[0014] Furthermore, the partition is firmly connected to the inner convex step through a snap-fit ​​structure, ensuring that the partition will not fall off naturally after installation, thereby enhancing the stability of the structure.

[0015] The present invention provides a common mode inductor with inner and outer step ring structure. Compared with the prior art, it has the following beneficial effects: 1. This common-mode inductor successfully divides the magnetic ring into four symmetrical winding sections by adding four raised steps on both sides of the inner and outer sides of the magnetic core, and the step height is about 1mm. This design allows the two coils of the common-mode inductor to be divided into four coils, and these four coils can maintain a fixed distance. This precise winding layout not only improves the accuracy and controllability of the winding, but also effectively achieves product consistency and ensures the stability and reliability of the electrical performance parameters of the inductor.

[0016] 2. After adding the steps, the surface area of ​​the core of the common-mode inductor has been significantly increased, thereby expanding the heat dissipation area. This improvement enables the common-mode inductor to better dissipate the heat generated during operation, reduces the temperature rise, and improves the thermal stability and service life of the inductor. This improvement is particularly important in high-efficiency and high-power switching power supplies because it helps maintain the stable performance of the inductor under long-term high-load operation.

[0017] 3. The increase in steps of the common-mode inductor also increases the weight of the magnetic core, which in turn increases the magnetic flux of the magnetic core. This change directly increases the inductance of the finished product, making the inductor perform better in suppressing common-mode interference. At the same time, due to the increase in inductance, the EMI suppression effect of the inductor has also been significantly enhanced, providing more effective electromagnetic compatibility protection for the circuit.

[0018] In summary, the proposed inner and outer step ring structure common mode inductor not only solves the shortcomings of the traditional pure circular magnetic ring common mode inductor in the winding process through the innovative step design, but also brings significant improvements in heat dissipation performance, inductance and EMI effect. This improvement not only meets the high requirements of high-efficiency and high-power switching power supplies for common mode inductor performance, but also provides new ideas and technical support for the development of the electronic component field. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the split structure of the present invention; Figure 2 It is a front view of the magnetic core of the present invention; Figure 3 It is a schematic diagram of the split structure of the magnetic core in the present invention; Figure 4 It is a schematic diagram of the assembly structure of the present invention; Figure 5 It is a front view after the present invention is assembled; Figure 6 It is a half-section view after the present invention is assembled.

[0020] In the figure: 1. magnetic core; 11. outer convex step; 12. inner convex step; 121. limiting groove; 122. clamping groove; 13. partition; 131. clamping protrusion; 2. first coil winding; 21. pin; 3. second coil winding; 4. PCB board; 41. reserved hole; 5. rubber seat. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1-6 The present invention provides a technical solution: a common-mode inductor with inner and outer step ring structure, mainly composed of a magnetic core 1, a first coil winding 2, a second coil winding 3, and a PCB board 4, wherein the magnetic core 1 is set to a ring structure, and a plurality of outer convex steps 11 and inner convex steps 12 are respectively connected to the outer edge and the inner edge of the magnetic core 1, and the plurality of outer convex steps 11 and the outer convex steps 11 are distributed at equal distances on the magnetic core 1, and the magnetic core 1 is divided into four equal winding intervals, and the first coil winding 2 and the second coil winding 3 are respectively wound and arranged outside the two opposite winding intervals, that is, the first coil winding 2 and the second coil winding 3 can be effectively divided into four coils, so that the four coils maintain a fixed distance, thereby achieving product consistency, and the magnetic core 1 is fixed as a whole on the upper part of the PCB board 4 after winding the first coil winding 2 and the second coil winding 3; Several outer convex steps 11, inner convex steps 12 and the magnetic core 1 are all integrally formed structures, the height of the outer convex step 11 and the inner convex step 12 are both set to 1 mm, the width of the outer convex step 11 is set to 2.4 mm, and the width of the inner convex step 12 is set to 1.16 mm; In addition, a partition 13 is provided between the first coil winding 2 and the second coil winding 3. The partition 13 can prevent the first coil winding 2 and the second coil winding 3 from interfering with each other during operation. The partition 13 is fixed between two opposing inner convex steps 12 through a snap-fit ​​structure. The engaging structure includes a limiting groove 121 provided at the end of the inner convex step 12, a plurality of engaging grooves 122 provided at both sides of the limiting groove 121, and a plurality of engaging protrusions 131 integrally connected to both sides of the end of the partition 13. The number and position of the engaging grooves 122 and the engaging protrusions 131 correspond to each other, and the engaging grooves 122 and the engaging protrusions 131 are mutually adapted hemispherical structures. When fixing the partition 13, the partition 13 is directly inserted into the limiting groove 121. During the insertion process, the engaging grooves 122 will engage with the engaging protrusions 131 one by one until the partition 13 is completely inserted into the limiting groove 121, and all the engaging grooves 122 will engage with the corresponding engaging protrusions 131, thereby ensuring that the partition 13 will not fall off naturally after installation. After the first coil winding 2 and the second coil winding 3 are wound, the bottoms of the first coil winding 2 and the second coil winding 3 are provided with two pins 21. A plurality of reserved holes 41 are reserved inside the PCB board 4. After the magnetic core 1 is assembled to the upper part of the PCB board 4, the pins 21 are inserted into the reserved holes 41 and extend to the bottom of the PCB board 4. A glue seat 5 is applied between the bottom of the magnetic core 1 and the upper surface of the PCB board 4, and the magnetic core 1 can be bonded and fixed to the upper part of the PCB board 4 through the glue seat 5, so that the assembled structure will be more stable; Finally, it should be noted that: 1. After adding the outer convex step 11 and the inner convex step 12, the surface area of ​​the magnetic core 1 is increased, thereby increasing the heat dissipation area of ​​the magnetic core 1, and reducing the working temperature of the common mode inductor; 2. After adding the outer convex step 11 and the inner convex step 12, the weight of the magnetic core 1 increases, that is, the magnetic flux of the magnetic core 1 increases, which can improve the inductance of the finished common mode inductor and improve the EMI effect.

Claims

1. A common-mode inductor with an inner and outer stepped ring structure, comprising a magnetic core (1), a first coil winding (2), a second coil winding (3) and a PCB board (4), characterized in that: The outer edge and inner edge of the magnetic core (1) are respectively provided with equidistantly distributed outer convex steps (11) and inner convex steps (12), dividing the magnetic core (1) into four winding sections, the first coil winding (2) and the second coil winding (3) are respectively wound in two opposite winding sections, so that the four coils are evenly distributed, and the magnetic core (1), the first coil winding (2) and the second coil winding (3) are fixed as a whole on a PCB board (4).

2. The common mode inductor according to claim 1, characterized in that: The outer convex step (11) and the inner convex step (12) are integrally formed with the magnetic core (1), and both have a height of 1 mm, a width of the outer convex step (11) of 2.4 mm, and a width of the inner convex step (12) of 1.16 mm.

3. The common mode inductor according to claim 1, characterized in that: Also includes: A partition (13) is arranged between the first coil winding (2) and the second coil winding (3), and is fixed between two opposing inwardly convex steps (12) via a snap-fit ​​structure to avoid mutual interference.

4. The common mode inductor according to claim 3, characterized in that: The snap-fit ​​structure comprises a limiting groove (121) provided at the end of the inner convex step (12), a snap-fitting groove (122) located inside the limiting groove (121), and a snap-fitting protrusion (131) at the end of the partition (13); the snap-fitting groove (122) and the snap-fitting protrusion (131) are mutually adapted hemispherical structures.

5. The common mode inductor according to claim 1, characterized in that: The first coil winding (2) and the second coil winding (3) are both provided with pins (21) at the bottom, and a reserved hole (41) matching the pin (21) is reserved on the PCB board (4), and the pin (21) is inserted into the reserved hole (41) and extends to the bottom of the PCB board (4).

6. The common mode inductor according to claim 1, characterized in that: A glue seat (5) is provided between the bottom of the magnetic core (1) and the upper surface of the PCB board (4), and is used to glue and fix the magnetic core (1) to the PCB board (4).

7. The common mode inductor according to claim 2, characterized in that: The provision of the outer convex step (11) and the inner convex step (12) enables the first coil winding (2) and the second coil winding (3) to maintain a fixed distance, thereby ensuring product consistency.

8. The common mode inductor according to claim 4, characterized in that: The partition (13) is firmly connected to the inner convex step (12) via a snap-fit ​​structure, ensuring that the partition (13) will not fall off naturally after installation, thereby enhancing the stability of the structure.

Images