Common mode inductor with inner and outer step annular structure

Abstract

The utility model 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, strong 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 utility model relates to the technical field of common mode inductor, specifically to a ring structure common mode inductor with inner and outer steps. BACKGROUND

[0002] As an important electromagnetic compatibility (EMC) component, common mode inductor is widely used in various power supplies 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 design is simple and has relatively low manufacturing cost, thus meeting the basic application requirements to some extent.

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

[0004] However, the pure circular magnetic core has no step or separation structure, so it is impossible to accurately control the distance between the 1 / 2 coil and the other 1 / 2 coil of each winding during winding. This inconsistency in distance will cause fluctuations in the electrical performance parameters of the inductor (such as impedance, inductance, etc.), affecting the consistency and stability of the product. In addition, the inaccuracy of the distance 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 meet the high requirements of high-efficiency high-power switching power supplies on the performance of common mode inductors, it is necessary to develop a new ring structure common mode inductor with inner and outer steps. SUMMARY

[0006] In view of the shortcomings of the prior art, the utility model provides a ring structure common mode inductor with inner and outer steps, which solves the problems raised in the background art.

[0007] In order to achieve the above object, the utility model discloses a kind of inside and outside step annular structure common mode inductor, including magnetic core, first coil winding, second coil winding and PCB board, wherein, magnetic core outer edge and inner edge are respectively provided with equidistant distribution outer convex step and inner convex step, magnetic core is divided into four winding intervals, first coil winding and second coil winding are wound in two opposite winding intervals respectively, four coil distribution is realized, and the whole of magnetic core, first coil winding, second coil winding is fixed on PCB board.

[0008] Further, the outer convex step and the inner convex step are integrally formed with the magnetic core, and the height of the outer convex step and the inner convex 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] Further, the common mode inductor further comprises:

[0010] The partition plate is arranged between the first coil winding and the second coil winding and is fixed between the two opposite inner convex steps through the clamping structure to avoid mutual interference.

[0011] Further, the clamping structure comprises a limiting groove opened at the end of the inner convex step, a clamping groove located in the limiting groove, and a clamping protrusion at the end of the partition plate, and the clamping groove and the clamping protrusion are mutually adapted hemispherical structures.

[0012] Further, the first coil winding and the second coil winding are each provided with a pin at the bottom, and the PCB board is preformed with a reserved hole matched with the pin, and the pin is inserted into the reserved hole and extends below the PCB board.

[0013] Further, a rubber seat is coated between the bottom of the magnetic core and the upper surface of the PCB board for bonding and fixing the magnetic core on the PCB board.

[0014] Further, the outer convex step and the inner convex step are arranged to keep a fixed distance between the first coil winding and the second coil winding, ensuring product consistency.

[0015] Further, the partition plate is firmly connected with the inner convex step through the clamping structure, ensuring that the partition plate will not naturally fall off after installation, and enhancing the stability of the structure.

[0016] The utility model provides a kind of inside and outside step annular structure common mode inductor.Compared with prior art, it has the following beneficial effects:

[0017] 1. The common mode inductor, by increasing 4 convex steps on the inner and outer sides of the magnetic core, and the step height is about 1mm, successfully divides the magnetic ring into 4 symmetrical winding intervals. This design makes the 2 coils of the common mode inductor can be divided into 4 coils, and the 4 coils can keep a fixed distance. This accurate winding layout not only improves the accuracy and controllability of winding, but also effectively realizes the consistency of the product, ensures the stability and reliability of the inductance electrical performance parameters.

[0018] 2. After increasing the step, the surface area of the magnetic core is significantly increased, thereby expanding the heat dissipation area. This improvement makes the common mode inductor better dissipate the heat generated during work, reduces the temperature rise, and improves the thermal stability and service life of the inductor. Especially in high-efficiency high-power switching power supply, this improvement is particularly important because it helps to maintain the stability of the inductor under long-time high-load work.

[0019] 3. The increase of the step also increases the weight of the magnetic core, thereby increasing the magnetic flux of the magnetic core. This change directly improves the inductance of the finished product, making the inductor perform better in suppressing common mode interference. At the same time, due to the increase of inductance, the EMI suppression effect of the inductor is also significantly enhanced, providing more effective electromagnetic compatibility protection for the circuit.

[0020] In summary, the proposed inside and outside step ring structure common mode inductor through the innovative step design, not only solves the shortcomings of traditional pure circular magnetic ring common mode inductor in the winding process, but also brings significant improvement in heat dissipation performance, inductance and EMI effect. This improvement not only meets the high requirements of high-efficiency high-power switching power supply on the performance of common mode inductor, but also provides new ideas and technical support for the development of electronic component field. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a split structure schematic diagram of the utility model;

[0022] Figure 2 It is a front view of the magnetic core in the utility model;

[0023] Figure 3 It is a split structure schematic diagram of the magnetic core in the utility model;

[0024] Figure 4 It is a split structure schematic diagram of the utility model;

[0025] Figure 5 It is a front view of the assembled utility model;

[0026] Figure 6 It is a half sectional view of the assembled utility model.

[0027] In the figure: 1, magnetic core; 11, outer convex step; 12, inner convex step; 121, limiting groove; 122, clamping groove; 13, partition plate; 131, clamping protrusion; 2, first coil winding; 21, pin; 3, second coil winding; 4, PCB board; 41, reserved hole; 5, glue seat. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0029] Please refer to Figures 1-6 The utility model provides a kind of technical solutions: a inside and outside step annular structure common mode inductor, it is mainly by magnetic core 1, first coil winding 2, second coil winding 3, PCB board 4 is composed, wherein, magnetic core 1 is set to annular structure, several outer convex steps 11 and inner convex step 12 are connected respectively on the outer edge and inner edge of magnetic core 1, several outer convex steps 11 and outer convex step 11 are equidistant distribution on magnetic core 1, first coil winding 2 and second coil winding 3 are wound and set respectively in the outside of two opposite winding intervals, that is, first coil winding 2 and second coil winding 3 can be effectively divided into four coils, let four coils keep a fixed distance, to realize the consistency of product, after winding first coil winding 2 and second coil winding 3, magnetic core 1 is integrally fixed on the upper portion of PCB board 4;

[0030] Several outer convex steps 11, inner convex step 12 and magnetic core 1 are all integrally formed structure, the height of outer convex step 11 and inner convex step 12 is all set as 1mm, the width of outer convex step 11 is set as 2.4mm, the width of inner convex step 12 is set as 1.16mm;

[0031] In addition, partition plate 13 is arranged between first coil winding 2 and second coil winding 3, partition plate 13 can avoid first coil winding 2, second coil winding 3 mutual interference when working, partition plate 13 is fixed between two opposite inner convex steps 12 by clamping structure;

[0032] The engagement structure includes a limiting groove 121 opened at the end of the inner protruding step 12, a plurality of clamping grooves 122 opened at both sides of the limiting groove 121, and a plurality of clamping protrusions 131 integrally connected at both sides of the end of the partition plate 13. The number and position of the clamping grooves 122 and the clamping protrusions 131 correspond to each other, and the clamping grooves 122 and the clamping protrusions 131 are mutually adapted hemispherical structures. When fixing the partition plate 13, the partition plate 13 is directly inserted into the inside of the limiting groove 121. During the insertion process, the clamping grooves 122 will be clamped one by one with the clamping protrusions 131. After the partition plate 13 is completely inserted into the inside of the limiting groove 121, all the clamping grooves 122 will be clamped with the corresponding clamping protrusions 131, so as to ensure that the partition plate 13 will not naturally fall off after installation.

[0033] After the first coil winding 2 and the second coil winding 3 are wound, the bottom has two pins 21. The inside of the PCB board 4 is reserved to open a plurality of reserved holes 41. After the magnetic core 1 is assembled to the upper part of the PCB board 4, the pins 21 are inserted into the inside of the reserved holes 41 and extend below the PCB board 4.

[0034] The bottom of the magnetic core 1 and the upper surface of the PCB board 4 are coated with a rubber seat 5. The magnetic core 1 can be adhered and fixed to the upper part of the PCB board 4 through the rubber seat 5. The assembled structure is more stable.

[0035] Finally, it needs to be pointed out that:

[0036] 1. After the outer protruding step 11 and the inner protruding step 12 are added, the surface area of the magnetic core 1 is increased, thereby increasing the heat dissipation area of the magnetic core 1, which can reduce the temperature of the common mode inductor during operation.

[0037] 2. After the outer protruding step 11 and the inner protruding step 12 are added, the weight of the magnetic core 1 is increased, that is, the magnetic flux of the magnetic core 1 is increased, which can improve the inductance of the finished common mode inductor, and the EMI effect is better.

Claims

1. A common mode inductor of a 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 the inner edge of the magnetic core (1) are respectively provided with equidistantly distributed outer convex steps (11) and inner convex steps (12), which divide the magnetic core (1) into four winding intervals, the first coil winding (2) and the second coil winding (3) are wound in opposite two winding intervals, four coil uniform distribution is realized, and the whole of the magnetic core (1), the first coil winding (2) and the second coil winding (3) is fixed on the PCB (4).

2. The common mode inductor of claim 1, wherein, The outer convex steps (11) and the inner convex steps (12) are an integral molding structure with the magnetic core (1), and the height of each is 1mm, the width of the outer convex steps (11) is 2.4mm, and the width of the inner convex steps (12) is 1.16mm.

3. The common mode inductor of claim 1, wherein, Further comprising: The partition plate (13) is arranged between the first coil winding (2) and the second coil winding (3), and is fixed between two opposite inner convex steps (12) through a clamping structure to avoid mutual interference.

4. The common mode inductor of claim 3, wherein, The clamping structure comprises a limiting groove (121) opened at the end of the inner convex step (12), a clamping groove (122) located inside the limiting groove (121), and a clamping protrusion (131) at the end of the partition plate (13), and the clamping groove (122) and the clamping protrusion (131) are mutually adapted hemispherical structures.

5. The common mode inductor of claim 1, wherein, The first coil winding (2) and the second coil winding (3) are both provided with pins (21) at the bottom, and the PCB (4) is provided with reserved holes (41) matched with the pins (21), the pins (21) are inserted into the reserved holes (41) and extended to below the PCB (4).

6. The common mode inductor of claim 1, wherein, The bottom of the magnetic core (1) and the upper surface of the PCB (4) are coated with a rubber seat (5) for bonding and fixing the magnetic core (1) on the PCB (4).

7. The common mode inductor of claim 2, wherein, The arrangement of the outer convex steps (11) and the inner convex steps (12) enables the first coil winding (2) and the second coil winding (3) to maintain a fixed distance, ensuring product consistency.

8. The common mode inductor of claim 4, wherein, The partition plate (13) is firmly connected with the inner convex step (12) through the clamping structure, ensuring that the partition plate (13) will not naturally fall off after installation, and enhancing the stability of the structure.

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