A structurally stable common mode inductor

Abstract

The utility model discloses a kind of structure stable common mode inductance, comprising: magnetic core assembly, it is set as a frame structure;Coil winding, winding in the magnetic core assembly, the coil winding is equipped with lead-out wire;Magnetic sheet, along the magnetic core assembly axial and be provided in the magnetic core assembly;Base, for fixing the magnetic core assembly, coil winding and magnetic sheet;The first side of the base is equipped with the installation area for installing the magnetic core assembly, the installation area is connected with the outer side wall of the magnetic core assembly;The second side of the base is equipped with the installation groove extending along the magnetic core assembly axial, the magnetic sheet is inserted in the installation groove;The base is also equipped with the clamping groove for clamping the lead-out wire.The utility model solves the problem of poor structure stability of existing common mode inductance.

Description

Technical Field

[0001] This utility model relates to the field of inductor technology, and in particular to a structurally stable common-mode inductor. Background Technology

[0002] A common-mode inductor, also called a common-mode choke, is an electromagnetic component used to suppress common-mode interference. A common-mode inductor typically consists of a magnetic core, around which a coil winding is wound and then mounted in a base. In existing common-mode inductors, the magnetic core, magnetic sheet, and coil winding are fixed to the base with adhesive, which is labor-intensive and time-consuming. Furthermore, there is no physical plastic insulation between the magnetic sheet and the coil winding, posing safety risks during vibration. The adhesive application point for the coil winding is on the mounting surface of the magnetic core in the base, resulting in excessively long leads that are prone to deformation, shaking, and retraction. All of these factors contribute to the overall instability of the common-mode inductor's structure. Utility Model Content

[0003] The main purpose of this invention is to provide a structurally stable common-mode inductor, aiming to solve the problem of poor structural stability of existing common-mode inductors.

[0004] To achieve the above objectives, this utility model proposes a structurally stable common-mode inductor, comprising:

[0005] The magnetic core assembly is arranged in a frame structure;

[0006] A coil winding is wound around the magnetic core assembly, and the coil winding is provided with lead wires;

[0007] A magnetic sheet is disposed axially within the magnetic core assembly;

[0008] The base is used to fix the magnetic core assembly, coil winding and magnetic sheet; the first side of the base is provided with a mounting area for mounting the magnetic core assembly, the mounting area is snapped into the outer wall of the magnetic core assembly; the second side of the base is provided with a mounting groove extending along the axial direction of the magnetic core assembly, the magnetic sheet is inserted into the mounting groove; the base is also provided with a slot for snapping into the lead wire.

[0009] Optionally, the magnetic core assembly includes a magnetic core and a protective upper cover and a protective lower cover that wrap around the outside of the magnetic core.

[0010] Optionally, the installation area includes several baffles that fit against the outer wall of the magnetic core assembly, the baffles having locking holes, and the outer side of the magnetic core assembly having a buckle that engages with the locking holes.

[0011] Optionally, the outer side of the buckle is provided with a first guide slope along its insertion direction.

[0012] Optionally, the inner side of the baffle is provided with a second guide slope along the buckle insertion direction, and the second guide slope is located above the buckle hole.

[0013] Optionally, the magnetic core assembly is configured as a rectangular frame structure, and several of the baffles are respectively attached to the end corners of the magnetic core assembly.

[0014] Optionally, the sidewall of the card slot is also provided with an opening communicating with its interior.

[0015] Optionally, the mounting groove and the base are configured as an integrally formed structure.

[0016] Optionally, the base is configured as a one-piece molded structure made of plastic.

[0017] Optionally, the coil windings are configured as two sets, and the two sets of coil windings are symmetrically wound on the sidewall of the magnetic core assembly.

[0018] The beneficial effects of this utility model are as follows: it improves the structure of existing common mode inductors, wherein the magnetic core assembly is fixed to the base by a snap-fit ​​structure, eliminating the need for glue application, improving production efficiency and reducing production costs; the magnetic sheet is installed by inserting it into the mounting slot on the other side of the base, eliminating the need for glue application, and the magnetic sheet and the magnetic core assembly are physically isolated by the mounting slot, improving safety performance; the lead wire is fixed to the base by snap-fit ​​through a snap-fit ​​mechanism, eliminating the need for glue application, improving the stability of the coil winding and the lead wire. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the common mode inductor of this utility model;

[0021] Figure 2 This is an exploded view of the common-mode inductor structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the base structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the base structure from another perspective of the present invention;

[0024] Figure 5 This is an exploded view of the magnetic core assembly structure of this utility model;

[0025] Label Explanation:

[0026] 1. Magnetic core assembly; 11. Magnetic core; 12. Protective upper cover; 13. Protective lower cover; 14. Buckle; 15. First guide slope;

[0027] 2. Coil winding; 21. Lead wire;

[0028] 3. Magnetic disc;

[0029] 4. Base; 41. Mounting slot; 42. Slot; 43. Baffle; 44. Slot hole; 45. Second guide slope; 46. Opening.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] One embodiment of this utility model proposes a structurally stable common-mode inductor, comprising:

[0035] The magnetic core assembly 1 is arranged in the form of a frame structure;

[0036] A coil winding 2 is wound around the magnetic core assembly 1, and the coil winding 2 is provided with a lead wire 21;

[0037] The magnetic sheet 3 is axially disposed in the magnetic core assembly 1;

[0038] The base 4 is used to fix the magnetic core assembly 1, the coil winding 2 and the magnetic sheet 3; the first side of the base 4 is provided with an installation area for installing the magnetic core assembly 1, and the installation area is snapped into the outer side wall of the magnetic core assembly 1; the second side of the base 4 is provided with an installation groove 41 extending along the axial direction of the magnetic core assembly 1, and the magnetic sheet 3 is inserted into the installation groove 41; the base 4 is also provided with a slot 42 for snapping into the lead wire 21.

[0039] This embodiment achieves a glue-free mechanical connection by using a snap-fit ​​design between the first mounting area of ​​the base 4 and the outer wall of the magnetic core assembly 1, and a plug-in fit between the second mounting groove 41 and the magnetic sheet 3. This design directly solves the technical pain points of "high labor costs for dispensing and long baking time" in traditional processes, significantly reducing manufacturing costs (saving labor and glue material costs in the dispensing process) and shortening the production cycle (no need to wait for glue to cure), while avoiding the risk of structural failure caused by glue aging. The mounting groove 41 extends axially along the magnetic core assembly 1, creating a rigid physical barrier between the magnetic sheet 3 and the coil winding 2, effectively solving the safety risks caused by the lack of plastic insulation between the magnetic sheet 3 and the coil winding 2. Especially under equipment vibration conditions, it can prevent accidental contact between the magnetic sheet 3 and the energized coil, meeting the mandatory requirements of safety standards such as IEC 60950 for electrical clearance and creepage distance. The glue dispensing between the lead wire 21 and the base 4 is eliminated, and it is fixed by snap-fitting through the slot 42, improving the stability of the coil winding 2 and the lead wire 21.

[0040] Furthermore, the magnetic core assembly 1 includes a magnetic core 11 and a protective upper cover 12 and a protective lower cover 13 wrapped around the magnetic core 11. The protective upper cover 12 and the protective lower cover 13 form a rigid protective layer by wrapping around the magnetic core 11, which can effectively resist mechanical stresses such as vibration and impact during transportation, installation, or use, preventing the magnetic core 11 from deforming, displacing, or breaking due to external forces, and ensuring the structural integrity of the magnetic core 11. The wrapping design of the protective upper cover 12 and the protective lower cover 13 reduces direct contact between the magnetic core 11 and the external environment, lowers the risk of mechanical damage caused by friction, collision, or dust intrusion, and extends the service life of the common-mode inductor.

[0041] Furthermore, the mounting area includes several baffles 43 that fit against the outer wall of the magnetic core assembly 1. Each baffle 43 has a locking hole 44, and the outer side of the magnetic core assembly 1 is provided with a buckle 14 that engages with the locking hole 44. The baffles 43 fit against the outer wall of the magnetic core assembly 1, physically restricting the horizontal (perpendicular to the axial) freedom of movement of the magnetic core assembly 1. Combined with the engagement of the buckle 14 and the locking hole 44, precise three-dimensional positioning of the magnetic core assembly 1 on the base 4 can be achieved, effectively preventing loosening, displacement, or tilting of the magnetic core assembly 1 due to vibration, impact, or long-term use, ensuring stable electromagnetic performance of the common-mode inductor during operation.

[0042] Furthermore, a first guide slope 15 is provided on the outer side of the buckle 14 along its insertion direction. The first guide slope 15 forms a wedge-shaped guide structure when the buckle 14 is inserted into the buckle hole 44. This slope structure transforms the traditional "vertical pressing" action required for buckling into a composite motion of "sloping surface sliding + elastic deformation," reducing the pressing force required for assembly, facilitating assembly convenience, and improving assembly efficiency. The guide slope replaces the rigid collision of the right-angle buckle 14 with sliding contact, reducing frictional loss between the buckle 14 and the edge of the buckle hole 44.

[0043] Furthermore, a second guide slope 45 is provided on the inner side of the baffle 43 along the insertion direction of the buckle 14, and the second guide slope 45 is located above the buckle hole 44. The first guide slope 15 and the second guide slope 45 form a double guide structure. When the buckle 14 is inserted, the second guide slope 45 first contacts the top of the buckle 14, guiding the buckle 14 to shift towards the buckle hole 44 through the slope sliding. Subsequently, the first guide slope 15 further adjusts the angle of the buckle 14 to improve assembly accuracy and efficiency.

[0044] Furthermore, the magnetic core assembly 1 is configured as a rectangular frame structure, with several baffles 43 respectively abutting the end corners of the magnetic core assembly 1. The symmetrical design of the rectangular frame structure allows for a more uniform distribution of the magnetic field within the magnetic core 11, reducing magnetic leakage caused by structural asymmetry. Simultaneously, the axial arrangement of the rectangular frame and the magnetic sheet 3 forms a closed magnetic circuit, further reducing magnetic resistance and increasing the inductance of the common-mode inductor and its ability to suppress common-mode interference. The geometric constraints of the rectangular frame and the baffles 43 restrict the horizontal movement freedom of the magnetic core assembly 1, and combined with the snap-fit ​​of the buckle 14 and the snap-fit ​​hole 44, a three-dimensional fixation is formed, significantly improving the overall structure's vibration resistance.

[0045] Furthermore, the side wall of the slot 42 is also provided with an opening 46 communicating with its interior. In this embodiment, by opening the opening 46 in the side wall of the slot 42, the stability of the lead wire 21 can be improved. The lead wire 21 and the base 4 can be connected without glue. Specifically, after the lead wire 21 is inserted into the slot 42 of the base 4, pressure can be applied to the lead wire 21 through the opening 46 with the help of an external tool, so that the lead wire 21 deforms along the direction of the opening 46 and engages with the buckle 14, thereby ensuring that the lead wire 21 can be stably limited in the slot 42.

[0046] Furthermore, the mounting groove 41 and the base 4 are configured as an integrally formed structure. In this embodiment, the integrally formed structure avoids the accumulation of gaps or tolerances between the mounting groove 41 and the base 4 caused by independent processing and assembly, ensuring the fitting accuracy between the magnetic sheet 3 and the mounting groove 41. Under vibration or impact environments, the risk of loosening, displacement, or abnormal noise of the magnetic sheet 3 can be reduced, significantly improving the vibration resistance of the common mode inductor.

[0047] Furthermore, the base 4 is a one-piece molded structure made of plastic. The plastic material has insulating properties, which can effectively isolate the magnetic core assembly 1, the coil winding 2 and the external circuit, avoiding the risk of short circuit or leakage caused by accidental contact, and is especially suitable for high voltage, high frequency or high power application scenarios.

[0048] Furthermore, the coil windings 2 are configured as two sets, and the two sets of coil windings 2 are symmetrically wound on the sidewalls of the magnetic core assembly 1. The two sets of coil windings 2 are symmetrically wound on the two sidewalls of the magnetic core 11. Through the symmetrical layout, the magnetic flux generated by the common-mode current enhances each other, and the differential-mode magnetic flux cancels each other out, thus optimizing the filtering performance.

[0049] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A structurally stable common-mode inductor, characterized in that, include: The magnetic core assembly is arranged in a frame structure; A coil winding is wound around the magnetic core assembly, and the coil winding is provided with lead wires; A magnetic sheet is disposed axially within the magnetic core assembly; The base is used to fix the magnetic core assembly, coil winding and magnetic sheet; the first side of the base is provided with a mounting area for mounting the magnetic core assembly, the mounting area is snapped into the outer wall of the magnetic core assembly; the second side of the base is provided with a mounting groove extending along the axial direction of the magnetic core assembly, the magnetic sheet is inserted into the mounting groove; the base is also provided with a slot for snapping into the lead wire.

2. The structurally stable common-mode inductor according to claim 1, characterized in that, The magnetic core assembly includes a magnetic core and a protective upper cover and a protective lower cover that wrap around the outside of the magnetic core.

3. The structurally stable common-mode inductor according to claim 1, characterized in that, The installation area includes several baffles that fit against the outer wall of the magnetic core assembly. The baffles have locking holes, and the outer side of the magnetic core assembly is provided with buckles that engage with the locking holes.

4. The structurally stable common-mode inductor according to claim 3, characterized in that, The buckle has a first guide slope on its outer side along its insertion direction.

5. The structurally stable common-mode inductor according to claim 3, characterized in that, The inner side of the baffle is provided with a second guide slope along the buckle insertion direction, and the second guide slope is located above the buckle hole.

6. The structurally stable common-mode inductor according to claim 3, characterized in that, The magnetic core assembly is configured as a rectangular frame structure, and several baffles are respectively attached to the end corners of the magnetic core assembly.

7. The structurally stable common-mode inductor according to claim 1, characterized in that, The card slot sidewall is also provided with an opening that communicates with its interior.

8. The structurally stable common-mode inductor according to claim 1, characterized in that, The mounting slot and the base are designed as a single molded structure.

9. The structurally stable common-mode inductor according to claim 8, characterized in that, The base is a one-piece molded structure made of plastic.

10. The structurally stable common-mode inductor according to claim 1, characterized in that, The coil windings are configured in two sets, and the two sets of coil windings are symmetrically wound on the sidewall of the magnetic core assembly.

Images