Common mode inductor

Abstract

The utility model relates to a common mode inductor, which is connected with a printed circuit board (PCB). The magnetic core is annular and is positioned on one side of the insulating bottom plate; each coil group comprises two coils which are linearly wound on the magnetic core at intervals, and the coil groups are arranged at intervals; and the plurality of magnetic blocks are positioned on one side, far away from the insulating bottom plate, of the magnetic core, and each magnetic block is mounted between two adjacent coil groups. The structure of the common mode inductor is changed, and the leakage inductance requirement is increased, so that low-frequency harmonic waves are inhibited, and the manufacturing cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of inverter inductance, especially relates to a common mode inductance. BACKGROUND

[0002] At present, when the photovoltaic system starts to operate, the current will be transmitted in the circuit, which contains common mode current component. The common mode inductor is composed of two groups of coils wound on the same core, and the two groups of coils have the same winding direction and number of turns.

[0003] However, in the actual operation process of the photovoltaic system in the related art, the whole machine is seriously disturbed by low-frequency harmonics, which has a great negative impact on the stability and performance of the whole system. INVENTION CONTENTS

[0004] In view of the deficiencies in the related art, the utility model provides a common mode inductance, changes the structure of the common mode inductance, increases the leakage inductance requirement, thereby suppresses the low-frequency harmonic, and reduces the manufacturing cost.

[0005] The utility model provides a kind of common mode inductance, connect PCB board, comprising:

[0006] Insulating base plate;

[0007] Magnetic core, annular, located at the side of the insulating base plate;

[0008] Multiple coil groups, each coil group includes two coils wound on the magnetic core in a straight line, and the coil groups are arranged at intervals;

[0009] Multiple magnetic blocks, located at the side of the magnetic core away from the insulating base plate, each magnetic block is installed between two adjacent coil groups.

[0010] Multiple magnetic blocks are arranged between multiple coil groups to increase the leakage of the original magnetic field, increase the leakage inductance effect, and replace the differential mode inductance with leakage inductance, thereby suppressing low-frequency harmonics.

[0011] In some embodiments, the magnetic core includes two parallel flat sections, one coil of each coil group is wound on one flat section, and the other coil is wound on the other flat section, and multiple coil groups and multiple magnetic blocks are arranged alternately side by side on the flat section.

[0012] Multiple coil groups and magnetic blocks are arranged alternately side by side, compact structure, save space.

[0013] In some embodiments, in the direction of the coil group arrangement, the two sides of any magnetic block are respectively arranged with a gap between two adjacent coil groups.

[0014] The gap between the magnetic block and the coil group avoids electrical interference or hysteresis loss caused by direct contact, and improves the safety of the common mode inductor.

[0015] In some embodiments, the distance between two adjacent coil groups is 9.9-10.1 mm, and the distance between the magnetic block and the two adjacent coil groups is 1.9-2.1 mm.

[0016] The distance between the coil group and the magnetic block improves the stability of the common mode inductor and improves the heat dissipation performance.

[0017] In some embodiments, the magnetic block is a cuboid, the length of each magnetic block extends perpendicular to the flat section of the magnetic core, and the length of any magnetic block in its extension direction is equal to the length of any coil group in the extension direction of the magnetic block.

[0018] The structure design of the cuboid magnetic block makes the magnetic flux more concentrated and uniformly distributed, improving the efficiency and stability of the common mode inductor.

[0019] In some embodiments, in any two coils of a coil group, each coil includes a starting end and an ending end, the ending end of one coil is connected to the starting end of the other coil, a plurality of openings are provided on the insulating base plate, and the starting end of one coil and the ending end of the other coil pass through the openings of the insulating base plate respectively to connect with the PCB.

[0020] The two coils of each coil group are connected in series and connected with the PCB, improving the structural stability.

[0021] In some embodiments, the common mode inductor further comprises a fixing member, in each coil group, a fixing member is provided at the bottom of any coil, the connection between the starting end and the opening, and the connection between the ending end and the other opening, and the bottom of each coil group is fixed on the insulating base plate.

[0022] The fixing member fixes the coil group and the insulating base plate together, improving the structural stability.

[0023] In some embodiments, a fixing member is provided at the contact point between each magnetic block and the magnetic core, and each magnetic block is fixed on the magnetic core.

[0024] The fixing member fixes the magnetic block on one side of the magnetic core, increasing the structural stability.

[0025] In some embodiments, in a coil group, the outer diameter of one coil is 54.6-54.8 mm, the number of turns is 4T, and the distance between turns is 1.4-1.6 mm.

[0026] The outer diameter and the inter-turn spacing of the coil are set, so that the working efficiency of the common mode inductor is improved.

[0027] In some embodiments, any of the magnetic blocks has a length of 120 mm, a width of 6 mm, and a height of 6 mm.

[0028] The magnetic blocks have reasonable volumes, so that the magnetic field is concentrated and distributed in the volumes, and the efficiency of the common mode inductor in suppressing low-frequency harmonics is improved.

[0029] Based on the above technical solutions, in the embodiment of the utility model, the magnetic core, the coil group and the magnetic block are arranged on the insulating bottom plate, the arrangement mode of the coil group and the magnetic block is optimized, the problem of low-frequency harmonic interference with the common mode inductor in the prior art is solved, and the structural stability and the working efficiency of the common mode inductor are improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings described herein are used to provide further understanding of the utility model, and constitute a part of the application, the illustrative embodiment of the utility model and the explanation thereof are used to explain the utility model, and do not constitute improper limitation on the utility model.

[0031] Figure 1 It is a structural schematic view of one embodiment of the common mode inductor of the utility model;

[0032] Figure 2 It is a structural schematic view of another embodiment of the common mode inductor of the utility model;

[0033] Figure 3 It is a structural schematic view of another embodiment of the common mode inductor of the utility model;

[0034] Figure 4 It is a structural schematic view of the magnetic core in one embodiment of the common mode inductor of the utility model;

[0035] Figure 5 It is a structural schematic view of the magnetic block in one embodiment of the common mode inductor of the utility model;

[0036] Figure 6 It is a structural schematic view of the insulating bottom plate in one embodiment of the common mode inductor of the utility model;

[0037] Figure 7 It is a structural schematic view of a coil in the coil group in one embodiment of the common mode inductor of the utility model;

[0038] Figure 8 It is a structural schematic view of another coil in the coil group in one embodiment of the common mode inductor of the utility model;

[0039] Figure 9 It is a structural schematic view of the fixing part in one embodiment of the common mode inductor of the utility model.

[0040] In the drawings:

[0041] 1, insulating base plate; 2, magnetic core; 201, flat section; 3, coil group; 301, coil; 3011, starting end; 3012, end; 4, magnetic block; 5, opening; 6, gasket; 7, fixing member. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0043] In the description of the present application, it should be understood that the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0044] The terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include one or more of the features.

[0045] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] As Figure 1 , 2 and 3, in one illustrative embodiment of the common mode inductor of the present application, the common mode inductor is connected to a PCB board, and the common mode inductor comprises an insulating base plate 1, a magnetic core 2, a plurality of coil groups 3 and a plurality of magnetic blocks 4.

[0047] The insulating base plate 1 is in the shape of a rectangular flat plate.

[0048] The magnetic core 2 is ring-shaped and located on one side of the insulating base plate 1.

[0049] Multiple coil groups 3, each coil group 3 includes two coils 301 wound in a straight line on the magnetic core 2, and the coil groups 3 are arranged at intervals.

[0050] Multiple magnetic blocks 4 are located on the side of the magnetic core 2 away from the insulating base plate 1, and each magnetic block 4 is installed between two adjacent coil groups 3.

[0051] In the above illustrative embodiment, a magnetic core 2 is disposed on an insulating base plate 1, and coil groups 3 are wound on the magnetic core 2. Each coil group 3 includes two coils 301 wound in a straight line at intervals. Magnetic blocks 4 are installed between the coil groups 3 to optimize the structure of the common-mode inductor, set a new magnetic field, and enhance the anti-interference capability of the common-mode inductor. The spacing arrangement between the coil groups 3 reduces mutual interference between the coils 301 and improves working performance.

[0052] Magnetic block 4 can be configured as a high-conductivity manganese-zinc ferrite core 2.

[0053] In some embodiments, such as Figure 1 , 2 As shown in Figures 3 and 4, the magnetic core 2 includes two parallel straight sections 201, with the two ends of the two straight sections 201 connected together to form a closed annular magnetic core structure. One coil 301 of each coil group 3 is wound on one straight section 201, and the other coil 301 is wound on the other straight section 201. Multiple coil groups 3 and multiple magnetic blocks 4 are arranged alternately side by side on the straight sections 201.

[0054] The straight section 201 of the magnetic core 2 is designed as two parallel parts, with the coil group 3 distributed between the two straight sections 201, optimizing the structure of the common-mode inductor and making the structure more compact. The coil group 3 and the magnetic block 4 are arranged alternately to make the magnetic field distribution more uniform and improve the anti-interference capability of the common-mode inductor. The straight section 201 of the magnetic core 2 facilitates the wiring of the coil 301 and the installation of the magnetic block 4, thereby improving manufacturing efficiency.

[0055] In some embodiments, as shown in the appendix Figure 1 , 2 In the direction in which the coil groups 3 are arranged, each magnetic block 4 is spaced apart from two adjacent coil groups 3 on both sides. In this embodiment, there are three coil groups 3, and correspondingly, two magnetic blocks 4.

[0056] By creating a gap between the magnetic block 4 and the two adjacent coil groups 3, the heat dissipation capacity of the overall structure can be improved, protecting the structural safety and the operational safety of each component. Simultaneously, by arranging the magnetic block 4 according to this structure, the original magnetic field distribution is altered, increasing the transverse magnetic field and optimizing the magnetic field distribution.

[0057] In some embodiments, the spacing between two adjacent coil groups 3 ranges from 9.9mm to 10.1mm, and the spacing between a magnetic block 4 and two adjacent coil groups 3 ranges from 1.9mm to 2.1mm. In this embodiment, the spacing between coil groups 3 refers to the distance between the opposite sides of two adjacent coils 301 within the coil group.

[0058] The spacing design improves inductor stability and optimizes inductor structure, further enhancing the common-mode rejection capability of the circuit system. By strictly controlling the spacing range between coil group 3 and magnet 4, the accuracy and consistency of the inductor can be ensured, reducing the impact of manufacturing errors. Furthermore, precise spacing control optimizes the magnetic flux path, improving the inductor's frequency response performance.

[0059] In some embodiments, such as Figure 5 As shown, the magnetic block 4 is a cuboid, and the length of each magnetic block 4 extends perpendicularly to the straight section 201 of the magnetic core 2. The length of any magnetic block 4 along its extension direction is equal to the length of any coil group 3 along the extension direction of the magnetic block 4.

[0060] The length of the magnetic block 4 is equal to the length of the coil group 3, which allows the magnetic field generated by the magnetic block 4 to cover the coil group 3, thereby blocking the longitudinal magnetic field of the original inductor, increasing the leakage magnetic field of the original magnetic field, and improving the collusion suppression effect.

[0061] In some embodiments, such as Figure 7 As shown, a coil 301 is provided with a start end 3011 and an end end 3012. (As...) Figure 8 As shown, another coil 301 is provided with a start end 3011 and an end end 3012. (As...) Figure 3 As shown, in any two coils 301 of coil group 3, each coil 301 includes a start end 3011 and an end end 3012. The end end 3012 of one coil 301 is connected to the start end 3011 of the other coil 301, as shown. Figure 6 As shown, multiple openings 5 ​​are provided on the insulating base plate 1. The starting end 3011 of one coil 301 and the ending end 3012 of another coil 301 pass through the openings 5 ​​of the insulating base plate 1 and are connected to the PCB board.

[0062] The end 3012 of coil 301 is directly connected to the start 3011 of another coil 301, connecting the two coils 301 in series, which simplifies the manufacturing process. After being connected in series, they pass through the insulating base plate 1 and connect to the PCB board, which enhances structural stability, reduces the number of external leads of coil 301, and improves the overall compactness of the inductor.

[0063] In some embodiments, such as Figure 6 As shown, rectangular pads 6 are provided on both sides of the insulating base plate 1. When the insulating base plate 1 contacts the PCB board, the pads 6 are used to reduce vibrations generated during operation and improve structural stability.

[0064] In some embodiments, the fixing member 7 is further included, and the fixing member 7 is arranged at the bottom of each coil group 3, at the connection between the starting end 3011 of any coil 301 and one opening 5, and at the connection between the ending end 3012 of any coil 301 and another opening 5, and the bottom of each coil group 3 is fixed on the insulating bottom plate 1.

[0065] The fixing member 7 connects and fixes the coil group 3 and the insulating bottom plate 1 together, and improves the structural stability. The coil group 3 is fixed through the starting end 3011 and the ending end 3012 of the coil 301 by using the fixing member 7, so as to avoid the coil 301 from shaking or moving in operation.

[0066] The fixing member 7 can adopt various forms such as buckles, pressing tablets, adhesives and the like, and effectively fixes and protects the key positions of the coil 301, so as to ensure the stability and reliability of the inductor under the conditions of mechanical vibration and thermal expansion.

[0067] In some embodiments, the fixing member 7 is arranged at the contact position between each magnetic block 4 and the magnetic core 2, and each magnetic block 4 is fixed on the magnetic core 2.

[0068] The fixing member 7 is arranged at the contact position between the magnetic block 4 and the magnetic core 2, and the stability of the magnetic block 4 is enhanced, so as to prevent the magnetic block 4 from being displaced in operation, improve the stability of the magnetic block 4 on the magnetic core 2, and thus keep the magnetic circuit unchanged and avoid the change of the magnetic flux distribution.

[0069] In some embodiments, in one coil group 3, the outer diameter of one coil 301 ranges from 54.6 mm to 54.8 mm, the number of turns of the coil 301 is 4T, and the turn-to-turn spacing ranges from 1.4 mm to 1.6 mm.

[0070] The specific limitation of the outer diameter and the number of turns of the coil 301 makes the electromagnetic characteristics of the inductor more controllable. By controlling the outer diameter, the number of turns and the turn-to-turn spacing, the performance stability of the inductor in the specified frequency range can be ensured, and the inconsistency and error of the inductor are reduced, which is beneficial to reducing the deviation of the produced products.

[0071] In some embodiments, the length, the width and the height of any magnetic block 4 are 120 mm, 6 mm and 6 mm, respectively.

[0072] The length, the width and the height of the magnetic block 4 are set to ensure that the magnetic block 4 can cooperate with the coil 301 and further optimize the magnetic flux path. By setting the size of the magnetic block 4, the unified production and assembly are facilitated.

[0073] From the description of the plurality of embodiments of the common mode inductor of the utility model, it can be seen that the common mode inductor of the utility model has at least one or more of the following advantages:

[0074] 1. Add a magnetic block to one side of the magnetic core to increase the transverse magnetic field, thereby blocking the original inductor's longitudinal magnetic field and increasing the leakage magnetic field of the original magnetic field, thus increasing the leakage inductance. This leakage inductance replaces the differential mode inductor, thereby suppressing low-frequency harmonics.

[0075] 2. The coil groups and magnetic blocks are arranged at intervals, optimizing the common mode inductor structure, making the structure more compact and saving manufacturing costs.

[0076] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0077] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A common mode inductor connected to a PCB board, characterized in that, The utility model relates to a magnetic core, and particularly relates to a magnetic core for a transformer. The utility model discloses a magnetic core for a transformer, which comprises an insulating base plate, a magnetic core in the shape of a ring located on one side of the insulating base plate, a plurality of coil groups, each of which comprises two coils wound in a straight line on the magnetic core, and a plurality of magnetic blocks located on the side of the magnetic core away from the insulating base plate, each of which is mounted between two adjacent coil groups. The magnetic core comprises two parallel flat sections, one coil of each coil group is wound on one flat section, and the other coil is wound on the other flat section, and the plurality of coil groups and the plurality of magnetic blocks are arranged alternately side by side on the flat sections. In the direction in which the coil groups are arranged, each magnetic block is arranged with a gap on both sides between two adjacent coil groups. The distance between two adjacent coil groups is in the range of 9.9mm-10.1mm, and the distance between a magnetic block and two adjacent coil groups is in the range of 1.9mm-2.1mm.

2. The common mode inductance of claim 1, wherein, The magnetic block is in the shape of a cuboid, the length of each magnetic block extends perpendicularly to the flat sections of the magnetic core, and the length of any magnetic block in the direction of extension is equal to the length of any coil group in the direction of extension of the magnetic block.

3. The common mode inductance of claim 2, wherein, In any coil group, each coil comprises a starting end and an ending end, the ending end of one coil is connected to the starting end of the other coil, a plurality of openings are provided on the insulating base plate, and the starting end of one coil and the ending end of the other coil pass through the openings of the insulating base plate to be connected to a PCB.

4. The common mode inductance of claim 3, wherein, The utility model also comprises a fixing member, in each coil group, a fixing member is arranged on both sides of the bottom of any coil, the connection between the starting end and the opening, and the connection between the ending end and the other opening, and the bottom of each coil group is fixed on the insulating base plate.

5. The common mode inductance of claim 2, wherein, A fixing member is arranged on the contact point between each magnetic block and the magnetic core, and each magnetic block is fixed on the magnetic core.

6. The common mode inductance according to claim 1 or 2, characterized in that In one coil group, the outer diameter of one coil is in the range of 54.6mm-54.8mm, the number of turns of the coil is 4T, and the distance between turns is in the range of 1.4mm-1.6mm.

7. The common mode inductance of claim 6, wherein, The length of any magnetic block is 120mm, the width is 6mm, and the height is 6mm.

8. The common mode inductance of claim 7, wherein, ​ 9. The common mode inductance according to any of claims 1-8, characterized in that, ​ 10. The common mode inductance of claim 9, wherein, ​

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