Low-noise inductor
By combining multilayer conductive and magnetic material shielding with flip-chip technology, the problem of electromagnetic interference in inductors is solved, achieving noise reduction and performance improvement without increasing size and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-20
AI Technical Summary
Existing inductors suffer from problems such as increased size, high cost, and decreased performance in terms of electromagnetic interference suppression. Furthermore, noise reduction measures are complex or costly, making it difficult to effectively reduce electromagnetic noise without increasing size and cost.
It employs a multi-layer conductive material shielding layer and a magnetic material shielding cover, combined with flip-chip technology and symmetrical winding of a toroidal inductor, and integrates a common-mode choke, optimizing the packaging structure, reducing electromagnetic noise and improving reliability.
Without significantly increasing size and cost, it effectively shields electromagnetic interference, reduces noise, improves inductor performance and reliability, simplifies packaging processes, and reduces heat buildup and dust ingress.
Smart Images
Figure CN224020587U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to inductor technical field especially relates to a low noise inductor. BACKGROUND
[0002] Inductor is a component that can convert electrical energy into magnetic energy and store it. Small inductors are usually made by directly winding enameled wire on a magnetic core, and are mainly used in circuits such as filtering, oscillation, wave limiting, and delay. It has two packaging forms: sealed and non-sealed, and both forms have two external structures: vertical and horizontal. The support for winding the coil becomes the skeleton. Some large fixed inductors or adjustable inductors such as oscillation coils and choke coils require small size, high efficiency, low noise, good heat dissipation, and resistance to electromagnetic interference as the electronic communication industry develops rapidly.
[0003] Currently, inductors are resistant to electromagnetic interference, usually adding a shield cover or shield layer around the inductor, and using metal materials to block electromagnetic radiation. However, this method increases the volume and weight of the inductor, and the manufacturing cost is high. The shielding effect may be limited by the packaging material and process. Some designs optimize the internal layout of the inductor to reduce electromagnetic interference, such as increasing the distance between the inductor coils or using staggered arrangement. However, this design increases the complexity and may cause performance degradation of the inductor, and is difficult to implement in some applications.
[0004] Currently, inductors achieve the purpose of noise reduction by selecting low electromagnetic interference (EMI) materials to manufacture the core components and packaging of the inductor. This method makes low-noise materials usually have a high price, and may not have enough mechanical strength or thermal stability in some applications, or integrates a filter in the inductor circuit to filter out high-frequency noise. However, this increases the complexity and cost of the circuit, and the design and debugging of the filter require additional technical support. SUMMARY
[0005] In view of the above problems in the prior art, the main purpose of the utility model is to provide a low noise inductor.
[0006] The technical scheme of the utility model is as follows: a low noise inductor, comprising a mounting plate, the top of the mounting plate is fixedly connected with a shield cover, the top end of the mounting plate is embedded with a substrate, the top end of the substrate is provided with an inductor body, the inside of the inductor body is provided with a chip, the chip is welded on the top end of the substrate through flip chip technology, the top end of the inner wall of the shield cover is provided with an access door, the inner wall of the shield cover and the bottom end of the access door are fixedly connected with a plurality of shielding layers, the shielding layers are all made of conductive materials, the inner wall of the shield cover and the bottom end of the access door are embedded with ferrite.
[0007] By adopting the technical scheme, the shielding cover outside the inductor body adopts a plurality of shielding layer structures, each layer is made of conductive material, electromagnetic interference can be effectively shielded, and magnetic materials such as ferrite are embedded in the shielding cover outside the inductor body, which has good electromagnetic shielding effect, so that the electromagnetic noise of the inductor can be effectively reduced by improving the packaging material and process without significantly increasing the volume and cost, and the overall performance and reliability of the inductor are improved.
[0008] As a preferred embodiment, the inductor body comprises a bracket, a ring inductor, a magnetic core and a fixing groove, the bracket is fixedly installed at the top end of the substrate, the magnetic core is fixedly connected inside the bracket, the ring inductor is symmetrically wound outside the magnetic core, and the fixing grooves are formed at both ends of the bracket.
[0009] By adopting the technical scheme, the common mode noise is reduced by the symmetric winding of the ring inductor, and the working noise of the inductor body can be reduced.
[0010] As a preferred embodiment, the top end of the shielding cover is provided with an inspection mechanism, the inspection mechanism comprises an opening and closing groove formed at the top of the shielding cover, the inspection door is slidably installed inside the opening and closing groove, a magnetic strip is embedded in one side of the inspection door, an iron strip is embedded in the inner wall of the opening and closing groove close to the inspection door, and the magnetic strip and the iron strip are attracted to each other.
[0011] By adopting the technical scheme, the magnetic strip and the iron strip are used in cooperation to realize the fixation and stability between the inspection door and the shielding cover.
[0012] As a preferred embodiment, the top of the shielding cover is provided with a heat dissipation mechanism, the heat dissipation mechanism comprises heat dissipation holes which are equidistantly formed in the inside of the shielding cover and located on both sides of the opening and closing groove.
[0013] By adopting the technical scheme, the heat generated by the inductor body in the shielding cover can be dissipated through the heat dissipation holes.
[0014] As a preferred embodiment, the heat dissipation mechanism further comprises a dust cover fixedly connected to the top of the shielding cover, and the dust cover is arranged above the heat dissipation holes.
[0015] By adopting the technical scheme, the dust cover shields the falling dust above the shielding cover, and reduces the entry of dust.
[0016] As a preferred implementation form, the inside of the opening and closing slot is provided with a limiting mechanism, the limiting mechanism comprises a sliding groove opened on the two sides of the inner wall of the opening and closing slot, and the sliding groove is slidably connected with a sliding block inside, and the two sliding blocks are fixedly connected with the two sides of the access door respectively.
[0017] By using the above technical scheme, through the cooperation of the sliding block and the sliding groove, the access door can be more stable during sliding.
[0018] As a preferred implementation form, the shielding cover is made of a packaging material with low dielectric constant and low loss factor.
[0019] By using the above technical scheme, through the setting of the packaging material, the use performance of the shielding cover can be improved.
[0020] As a preferred implementation form, the top of the access door is fixedly connected with a handle for opening and closing.
[0021] By using the above technical scheme, through the setting of the handle, the opening and closing operation of the access door is facilitated.
[0022] Compared with the prior art, the utility model has the advantages and positive effects that,
[0023] 1. In the utility model, the shielding cover outside the inductor body adopts a plurality of shielding layer structures, and each layer is made of conductive material, which can effectively shield electromagnetic interference, and by embedding magnetic materials such as ferrite in the shielding cover outside the inductor body, these materials have good electromagnetic shielding effect, and in the improvement of the packaging material: the shielding cover is made of a packaging material with low dielectric constant and low loss factor, such as polyimide, liquid crystal polymer, etc., these materials have excellent electromagnetic shielding performance and thermal stability, which can further improve the electromagnetic shielding performance of the inductor body, and in the design of the inductor body, a common mode choke coil is integrated, the common mode noise is reduced through the symmetrical winding of the ring inductor, the consistency and symmetry of the winding are ensured, and in the optimization of the packaging structure: the flip chip technology is adopted, the chip is directly welded on the substrate, the lead length and parasitic inductance are reduced, so that the electromagnetic noise of the inductor can be effectively reduced and the overall performance and reliability of the inductor can be improved without significantly increasing the volume and cost by improving the packaging material and process.
[0024] 2. In the utility model, through the setting of the heat dissipation hole, the heat generated by the inductor body in the shielding cover can be dissipated through the heat dissipation hole, the heat accumulation phenomenon in the shielding cover is reduced, and through the dust cover, the falling dust above the shielding cover is shielded, the entry of dust is reduced, and through the pulling of the access door in the opening and closing slot, the staff can maintain and repair the inductor body in the shielding cover through the opening and closing slot, and through the cooperation of the magnetic stripe and the iron strip, the fixing and stability between the access door and the shielding cover are realized. Attached Figure Description
[0025] Figure 1 This utility model provides an overall perspective view of a low-noise inductor;
[0026] Figure 2 A half-sectional view of a low-noise inductor provided by this utility model;
[0027] Figure 3 A cross-sectional view of a low-noise inductor provided by this utility model;
[0028] Figure 4 This invention provides a low-noise inductor. Figure 1 Enlarged view of point A in the middle.
[0029] Legend: 1. Mounting plate; 2. Shielding cover; 3. Magnetic strip; 4. Inspection door; 5. Opening and closing slot; 6. Dust cover; 7. Iron strip; 8. Bracket; 9. Fixing slot; 10. Toroidal inductor; 11. Substrate; 12. Heat dissipation hole; 13. Slider; 14. Slide groove; 15. Shielding layer; 16. Ferrite; 17. Chip; 18. Magnetic core. Detailed Implementation
[0030] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0031] Reference Figures 1-4The utility model provides a low noise inductor, including mounting plate 1, the top fixedly connected with shield case 2 of mounting plate 1, the top inlay of mounting plate 1 is embedded with base plate 11, the top of base plate 11 is provided with inductor body, the inside of inductor body is provided with chip 17, chip 17 is welded in the top of base plate 11 through flip chip technology, the top of shield case 2 inner wall is provided with access door 4, the inner wall of shield case 2 and the bottom of access door 4 are all fixedly connected with multilayer shielding layer 15, shielding layer 15 all are made of conductive material, the inner wall of shield case 2 and the bottom of access door 4 all are inlayed with ferrite 16, the shield case 2 outside inductor body adopts multiple shielding layers 15 structure, and every layer is made of conductive material, can effectively shield electromagnetic interference, and inlay magnetic material, such as ferrite 16 in the shield case 2 outside inductor body, these materials have good electromagnetic shielding effect, and in the improvement aspect of packaging material: shield case 2 selects low dielectric constant and low loss factor packaging material, such as polyimide, liquid crystal polymer etc., these materials have excellent electromagnetic shielding performance and thermal stability, can further improve the electromagnetic shielding performance of inductor body, and integrate common mode choke in the design of inductor body, reduce common mode noise through annular inductance 10 symmetrical winding mode, ensure the consistency and symmetry of winding, and in the optimization aspect of packaging structure: adopt flip chip technology, chip 17 is directly welded on base plate 11, reduce the length of lead and parasitic inductance, so that can effectively reduce the electromagnetic noise of inductor in the case where not significantly increasing the volume and cost through improving packaging material and process, improve the overall performance and reliability of inductor.
[0032] Specifically, the inductor body includes a bracket 8, an annular inductor 10, a magnetic core 18, and a fixing groove 9. The bracket 8 is fixedly installed at the top of the base plate 11. The magnetic core 18 is fixedly connected inside the bracket 8. The annular inductor 10 is symmetrically wound outside the magnetic core 18. The fixing grooves 9 are formed at both ends of the bracket 8. One end of the annular inductor 10 passes through the fixing grooves 9. The common mode choke is integrated in the design of the inductor body. The common mode noise is reduced through the symmetrical winding of the annular inductor 10, thereby reducing the working noise of the inductor body. The top of the shield case 2 is provided with a maintenance mechanism. The maintenance mechanism includes an opening and closing groove 5 formed at the top of the shield case 2. The access door 4 is slidingly installed inside the opening and closing groove 5. A magnetic strip 3 is inlaid on one side of the access door 4. An iron strip 7 is inlaid on the inner wall of the opening and closing groove 5 near the access door 4. The magnetic strip 3 is attracted to the iron strip 7. By pulling the access door 4 in the opening and closing groove 5, the staff can maintain and repair the inductor body in the shield case 2 through the opening and closing groove 5. The magnetic strip 3 and the iron strip 7 are used together to fix and stabilize the access door 4 and the shield case 2.
[0033] Specific, shield 2 top of both ends of the heat dissipation mechanism is provided with, heat dissipation mechanism includes equidistantly set in the shield 2 inside and located on both sides of the opening and closing slot 5 heat dissipation hole 12, through the heat dissipation hole 12 is set, can be shield 2 inductor body generated by heat through the heat dissipation hole 12 to dissipate, reduce the shield 2 in the phenomenon of heat accumulation, heat dissipation mechanism also includes fixedly connected to the top of the shield 2 dust cover 6, dust cover 6 is set above the heat dissipation hole 12, through the dust cover 6, the shield 2 above the dust cover is blocked, reduce the entry of dust, opening and closing slot 5 inside is provided with a limiting mechanism, limiting mechanism includes opening and closing slot 5 inner wall both sides of the sliding slot 14, the sliding slot 14 inside is slidably connected with the sliding block 13, two sliding block 13 is respectively fixedly connected with both sides of the access door 4, through the sliding block 13 and sliding slot 14 is used in coordination, can make the access door 4 in the sliding process is more stable, at the same time can play a certain limiting effect to the access door 4, shield 2 is selected with low dielectric constant and low loss factor of packaging material, the top of the access door 4 is fixedly connected with the handle for opening and closing, through the handle is set, in order to facilitate the opening and closing operation of the access door 4.
[0034] Working principle: first, the shield 2 outside the inductor body adopts a plurality of shielding layer 15 structure, and each layer is made of conductive material, can effectively shield electromagnetic interference, and by embedding magnetic material in the shield 2 outside the inductor body, such as ferrite 16, these materials have good electromagnetic shielding effect, and in the improvement of packaging material: shield 2 is selected with low dielectric constant and low loss factor of packaging material, such as polyimide, liquid crystal polymer, etc., these materials have excellent electromagnetic shielding performance and thermal stability, can further improve the electromagnetic shielding performance of the inductor body, and integrate common mode choke coil in the design of inductor body, through the symmetrical winding mode of ring inductor 10 to reduce common mode noise, ensure the consistency and symmetry of winding, and in the optimization of packaging structure: using flip chip technology, the chip 17 is directly welded on the substrate 11, reduce the length of lead and parasitic inductance, so as to be able to effectively reduce the electromagnetic noise of inductor by improving the packaging material and process without significantly increasing the volume and cost, improve the overall performance and reliability of inductor;
[0035] By pulling the access door 4 in the opening and closing slot 5, the staff can repair and maintain the inductor body in the shield 2 through the opening and closing slot 5, and realize the fixation and stability between the access door 4 and the shield 2 through the cooperation of the magnetic stripe 3 and the iron bar 7, and through the setting of the heat dissipation hole 12, the heat generated by the inductor body in the shield 2 can be dissipated through the heat dissipation hole 12, reducing the heat accumulation phenomenon in the shield 2, and the dust cover 6 is set above the shield 2 to block the dust falling on the shield 2, reducing the entry of dust.
[0036] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to some technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A low-noise inductor, comprising a mounting plate (1), characterized in that: The top of the mounting plate (1) is fixedly connected to a shield (2), and a substrate (11) is embedded in the top of the mounting plate (1). An inductor body is provided at the top of the substrate (11), and a chip (17) is provided inside the inductor body. The chip (17) is soldered to the top of the substrate (11) by flip chip technology. The top of the inner wall of the shield (2) is provided with an inspection door (4). The inner wall of the shield (2) and the bottom of the inspection door (4) are both fixedly connected with multiple layers of shielding (15). The shielding layers (15) are all made of conductive materials. Ferrite (16) is embedded in the inner wall of the shield (2) and the bottom of the inspection door (4).
2. The low-noise inductor according to claim 1, characterized in that: The inductor body includes a bracket (8), a toroidal inductor (10), a magnetic core (18), and a fixing groove (9). The bracket (8) is fixedly installed on the top of the substrate (11). The magnetic core (18) is fixedly connected inside the bracket (8). The toroidal inductor (10) is symmetrically wound on the outside of the magnetic core (18). Fixing grooves (9) are provided at both ends of the bracket (8). One end of the toroidal inductor (10) passes through the fixing groove (9).
3. A low-noise inductor according to claim 1, characterized in that: The top of the shield (2) is provided with a maintenance mechanism, which includes an opening and closing groove (5) on the top of the shield (2). The maintenance door (4) is slidably installed inside the opening and closing groove (5). A magnetic strip (3) is embedded in one side of the maintenance door (4). An iron strip (7) is embedded in the inner wall of the opening and closing groove (5) on the side close to the maintenance door (4). The magnetic strip (3) and the iron strip (7) are attracted to each other.
4. A low-noise inductor according to claim 3, characterized in that: The shield (2) is provided with heat dissipation mechanisms at both ends of the top. The heat dissipation mechanisms include heat dissipation holes (12) that are equidistantly opened inside the shield (2) and located on both sides of the opening and closing groove (5).
5. A low-noise inductor according to claim 4, characterized in that: The heat dissipation mechanism also includes a dust cover (6) fixedly connected to the top of the shield (2), and the dust cover (6) is positioned above the heat dissipation hole (12).
6. A low-noise inductor according to claim 3, characterized in that: The opening and closing groove (5) is provided with a limiting mechanism. The limiting mechanism includes sliding grooves (14) on both sides of the inner wall of the opening and closing groove (5). Sliding blocks (13) are slidably connected inside the sliding grooves (14). The two sliding blocks (13) are fixedly connected to both sides of the inspection door (4).
7. A low-noise inductor according to claim 1, characterized in that: The shield (2) is made of a packaging material with low dielectric constant and low loss factor.
8. A low-noise inductor according to claim 1, characterized in that: The top of the inspection door (4) is fixedly connected with a handle for opening and closing.