SMD (Surface Mount Device) common-mode inductor
By setting through holes in the housing to connect the magnetic ring and the coil by inserting guide pins, the production process of surface mount common mode inductors is simplified, solving the problems of high production difficulty and cumbersome procedures, and achieving more efficient production.
Patent Information
- Application Number
- CN202520122252.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-01-17
AI Technical Summary
Existing surface-mount common-mode inductors are difficult to manufacture and involve complicated production processes.
A through hole is provided on the outer casing to allow the guide pin to be inserted. The magnetic ring and coil are connected to the guide pin respectively, simplifying the production process.
This reduces the difficulty of manufacturing common-mode inductors and improves production efficiency.
Smart Images
Figure CN223784962U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of inductor technology, specifically to a surface-mount common-mode inductor. Background Technology
[0002] A common-mode inductor, also called a common-mode choke, is a common-mode interference suppression device with a ferrite core. In balanced circuits, it effectively suppresses common-mode interference signals without affecting the normal transmission of differential-mode signals. A common-mode inductor consists of two coils of the same size and number of turns symmetrically wound on the same ferrite toroidal core, forming a four-terminal device.
[0003] Existing surface mount common mode inductors fix the pins to the magnetic ring, and then fix the magnetic ring to the housing. This not only makes production more difficult, but also requires more production steps. Utility Model Content
[0004] To address the cumbersome manufacturing process of existing surface-mount inductors, this invention provides a surface-mount common-mode inductor. The specific technical solution of this invention is as follows:
[0005] A surface-mount common-mode inductor includes: a housing, a magnetic ring, a coil, and pins. The housing has a receiving cavity, and a baffle is provided in the receiving cavity. The magnetic ring is located in the receiving cavity and is sleeved on the baffle. The coil is wound on both sides of the magnetic ring and is located on both sides of the baffle. The housing has vertical through holes distributed around the receiving cavity. The pins are disposed in the through holes and are connected to the coil. Each pin includes a solder joint, which is disposed on the bottom surface of the housing.
[0006] Furthermore, the outer shell is rectangular in shape, and the through holes are respectively located at the four corners of the rectangular shell.
[0007] Furthermore, the first opening of the receiving cavity is located below the outer shell.
[0008] Furthermore, the guide pin includes an upper end extending from above the through hole, and the receiving cavity is provided with a second opening the same number as the guide pin. The second opening is located on the top of the housing, and the wire ends of the coil pass through the second opening and the upper end of the guide pin respectively.
[0009] Furthermore, the end of the coil is welded to the upper end of the guide pin, and the coil is a round copper wire or a flat copper wire.
[0010] Furthermore, the guide pin also includes an extension portion, which is vertically disposed on the side of the housing and connected to the welding portion.
[0011] Furthermore, a groove is provided at the bottom of the outer casing, and the extension and welding portion are disposed in the groove.
[0012] Compared with existing technologies, the advantages of this utility model are as follows: The surface mount common mode inductor described in this application has through holes on the outer shell, so that the guide pins can be inserted into the through holes. Then, the magnetic ring is placed in the receiving cavity, and the coils are connected to the guide pins respectively, thus completing the production of the common mode inductor. The common mode inductor has a simple structure, which reduces the production difficulty of the common mode inductor and improves the production efficiency of the common mode inductor. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of a surface-mount common-mode inductor in one embodiment of the present invention. Figure 1 ;
[0014] Figure 2 This is an exploded view of a surface-mount common-mode inductor in one embodiment of the present invention. Figure 1 ;
[0015] Figure 3 This is a schematic diagram of the structure of a surface-mount common-mode inductor in one embodiment of the present invention. Figure 2 ;
[0016] Figure 4 This is an exploded view of a surface-mount common-mode inductor in one embodiment of the present invention. Figure 2 . Detailed Implementation
[0017] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
[0018] In the description of this utility model, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are 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 element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.
[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature, and in this description of the utility model, "at least" means one or more, unless otherwise explicitly specified.
[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0021] In this utility model, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "below," and "over" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Above," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0022] The following description, in conjunction with the accompanying drawings, further illustrates specific embodiments of the present invention, making the technical solution and beneficial effects of the present invention clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.
[0023] like Figures 1 to 4As shown, a surface-mount common-mode inductor includes: a housing 1, a magnetic ring 2, a coil 3, and a lead pin 4. The housing 1 has a receiving cavity 5, and the receiving cavity 5 has a baffle 6. The baffle 6 is integrated with the housing 1, which can reduce the production steps of the inductor. It is not necessary to produce the housing 1 first, then the baffle 6, and then combine the baffle 6 with the housing 1. The magnetic ring 2 is a square magnetic ring, which is relatively easy to manufacture. The magnetic ring 2 is located in the receiving cavity 5 and is sleeved on the baffle 6. The coil 3 is wound on both sides of the magnetic ring 2 and is located on both sides of the baffle 6. The baffle 6 separates the coils 3 on both sides to prevent the coils 3 from contacting each other and causing a short circuit. The outer shell 1 is provided with vertical through holes 7, which are distributed around the receiving cavity 5. The guide pins 4 are inserted into the through holes 7. Inductors generally have four connection ports, so the number of guide pins 4 and through holes 7 is 4. The guide pins 4 are connected to the wire ends of the coils 3 respectively. The guide pins 4 include a welding part 10, which is located on the bottom surface of the outer shell 1. The welding part 10 is used to weld to the metal contacts of the circuit board.
[0024] In one embodiment, the outer shell 1 is rectangular, and the through holes 7 are respectively disposed at the four corners of the rectangular shell 1.
[0025] In one embodiment, the first opening 8 of the receiving cavity 5 is located below the outer shell 1. When the inductor is soldered onto the circuit board, the first opening 8 is closed by the circuit board to prevent the magnetic ring 2 from falling out of the outer shell 1.
[0026] In one embodiment, the guide pin 4 includes an upper end portion 9 extending from above the through hole 7, and the receiving cavity 5 is provided with a second opening 13 in the same number as the guide pin 4. The second opening 13 is located on the top of the outer shell 1, and the wire end of the coil 3 extends out from the receiving cavity 5 through the second opening 13 and connects to the guide pin 4.
[0027] In one embodiment, the ends of the coil 3 are welded to the upper end 9 of the guide pin 4 through the second opening 13. The coil 3 is a round copper wire or a flat copper wire. During welding, the ends of the coil are hung on the upper end 9 and then welded by a machine to improve welding efficiency.
[0028] In one embodiment, the guide pin 4 further includes an extension portion 11, which is vertically disposed on the side of the housing 1 and connected to the solder portion 10. When the inductor is soldered onto the circuit board, the extension portion 11 can increase the connection area between the guide pin 4 and the metal contacts of the circuit board. The extension portion 11, the solder portion 10, and the upper end portion 9 constitute a J-shaped guide pin 4.
[0029] In one embodiment, the bottom of the outer casing 1 is provided with a groove 12, and the extension portion 11 and the welding portion 10 are disposed in the groove 12.
[0030] The surface mount common mode inductor described in this application has a through hole 7 on the housing 1, so that the guide pin 4 can be inserted into the through hole 7. Then, the magnetic ring 2 is placed in the receiving cavity 5, and the coil 3 is connected to the guide pin 4 respectively, thus completing the production of the common mode inductor. The common mode inductor has a simple structure, which reduces the production difficulty of the common mode inductor and improves the production efficiency of the common mode inductor.
[0031] In the description of this specification, the terms "in one embodiment," "preferred," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. The connection methods linked in the description of this specification have significant effects and practical utility.
[0032] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions based on this utility model using techniques known in the art all fall within the protection scope of this utility model and should be defined by the claims.
Claims
1. A surface-mount common-mode inductor, characterized in that, include: The device comprises a housing, a magnetic ring, a coil, and guide pins. The housing has a receiving cavity, and a baffle is provided in the receiving cavity. The magnetic ring is located in the receiving cavity and is sleeved on the baffle. The coil is wound on both sides of the magnetic ring and is located on both sides of the baffle. The housing has vertical through holes distributed around the receiving cavity. The guide pins are disposed in the through holes and are connected to the coils. The guide pins include a welding part, which is located on the bottom surface of the housing.
2. The surface-mount common-mode inductor according to claim 1, characterized in that, The outer shell is rectangular, and the through holes are respectively located at the four corners of the rectangular shell.
3. The surface-mount common-mode inductor according to claim 2, characterized in that, The first opening of the receiving cavity is located at the bottom of the outer shell.
4. The surface-mount common-mode inductor according to claim 3, characterized in that, The guide pin includes an upper end extending from above the through hole. The receiving cavity is provided with a second opening equal in number to the guide pin. The second opening is located on the top of the housing. The wire ends of the coil pass through the second opening and are connected to the upper end of the guide pin.
5. The surface-mount common-mode inductor according to claim 4, characterized in that, The end of the coil is welded to the upper end of the guide pin, and the coil is a round copper wire or a flat copper wire.
6. The surface-mount common-mode inductor according to claim 4, characterized in that, The guide pin also includes an extension portion, which is vertically disposed on the side of the housing and connected to the welding portion.
7. The surface mount common mode inductor according to claim 6, characterized in that, The bottom of the outer casing is provided with a groove, and the extension and welding part are disposed in the groove.