Metal magnetic ring structure, mainboard and electronic product
By using metal magnetic ring structures in electronic products and using the hysteresis loss mechanism of ferrite cores and grounding parts, the problem of high-frequency noise suppression in electronic products is solved, achieving efficient noise suppression and space savings.
Patent Information
- Application Number
- CN202421907759.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-07
AI Technical Summary
The prior art has high cost, complex materials and poor results in suppressing the noise generated during high-frequency and high-speed transmission of electronic products. In particular, the use of conductive foam/metal barrier walls requires specific conditions, and common solutions increase the risk of short circuit on the motherboard.
The metal magnetic ring structure is adopted, including a ferrite core and a grounding member. The ferrite core is used to convert the current radiation on the cable into hysteresis loss, and is connected to the system grounding electrode through the grounding member to form a low-pass filter to suppress noise.
Effectively suppress high-frequency noise, reduce component number, save space, increase cable structure strength, and consume noise energy through hysteresis loss to improve transmission quality.
Smart Images
Figure CN223092653U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of noise suppression of electronic products, in particular to a metal magnetic ring structure, a main board and an electronic product. Background Technique
[0002] The application of external devices for electronic products has been very popular. For example, the use of large-capacity external hard drives, wireless keyboard and mouse receivers, and display outputs of more than two screens. With the popularization of external devices and the update of technology, the application frequency has also increased. When using high-frequency and high-speed data transmission, the generated noise will affect wireless transmission, and in severe cases, it will even interrupt the connection. To improve this problem, some countermeasures are usually added to improve the transmission quality.
[0003] Common solutions include: attaching aluminum foil and polyester film (Mylar) to the noise source to shield the noise or vent the noise to the system ground; or, attaching wave-absorbing materials to the noise source, and converting the noise into hysteresis loss by magnetic materials to suppress the noise; or, attaching conductive foam to the metal structural member to vent the noise to the system ground; or, using metal or sputtered shell parts near the antenna to form an isolation noise file wall.
[0004] However, in the above solutions, when using conductive mechanism auxiliary materials, insulating auxiliary materials need to be added to avoid short-circuiting of the main board, so the cost will increase; the wave-absorbing material is a composite magnetic material with high cost; the conductive foam / metal barrier needs to meet certain conditions to be introduced. Content of the Utility Model
[0005] To solve at least the above technical problems existing in the prior art, the utility model provides a metal magnetic ring structure, a main board and an electronic product.
[0006] On the one hand, the utility model provides a metal magnetic ring structure, including a ferrite core and a grounding part; the ferrite core includes a perforation for sleeving on the outer wall of a cable, and the ferrite core is used for converting the current radiation on the cable into hysteresis loss; the grounding part is connected to the ferrite core and is used for connecting to the grounding electrode of the system connected to the ferrite core.
[0007] In some embodiments, the ferrite core is cylindrical, the cross-sectional shape of the perforation is circular; and the center line of the perforation coincides with the axis of the ferrite core.
[0008] In some embodiments, the grounding member includes a conductive foam ring, and the cross-sectional shape of the conductive foam ring is rectangular; the top edge of the conductive foam ring is located within the perforation, arranged along the center line direction of the perforation, and is in contact with the inner wall of the perforation, the bottom edge of the conductive foam ring is located outside the outer wall of the ferrite core and is in contact with the outer wall of the ferrite core, and the two side edges of the conductive foam ring are respectively in contact with the side ends of the outer wall of the ferrite core on the same side; the bottom edge of the conductive foam ring is used to connect to the grounding electrode of the system connected to the ferrite core.
[0009] In some embodiments, the diameter of the ferrite core ranges from 4 mm to 8 mm, and the length of the ferrite core ranges from 10 mm to 14 mm; the aperture of the perforation ranges from 2 mm to 4 mm.
[0010] In some embodiments, the width of the conductive foam ring ranges from 1 mm to 2 mm, and the thickness of the conductive foam ring ranges from 0.5 mm to 1.5 mm.
[0011] On the other hand, the present utility model also provides a main board, including the above metal magnetic ring structure.
[0012] In some embodiments, it includes multiple such cables, and the multiple cables are sleeved with the ferrite core.
[0013] On yet another aspect, the present utility model also provides an electronic product, including the above metal magnetic ring structure or the above main board.
[0014] For a metal magnetic ring structure, a main board and an electronic product provided by the present utility model, in use, the ferrite core is sleeved on the cable. When current passes through the ferrite core, magnetic flux will be generated on the ferrite core, and the current energy is converted into magnetic energy; when the current changes, the magnetic flux will be converted back into current through electromagnetic induction. At this time, not all of the magnetic flux energy returns to the current energy, and some are lost as magnetic losses. Based on this principle, current radiation can be converted into hysteresis loss to suppress noise. In the technical solution of the present utility model, the metal magnetic ring structure is used as a low-pass filter to block high-frequency current, which can effectively suppress high-frequency noise; in addition, the metal magnetic ring structure is connected to the cable, which can fix the cable routing, increase the structural strength of the cable, and reduce the number of mechanical accessories, thereby increasing the system space. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present utility model will become readily understood. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, wherein:
[0016] In the drawings, the same or corresponding reference numerals denote the same or corresponding parts.
[0017] Figure 1 This is a schematic diagram of the metal magnetic ring structure provided by an embodiment of the present invention. Figure One ;
[0018] Figure 2 This is a schematic diagram of the metal magnetic ring structure provided by an embodiment of the present invention. Figure Two ;
[0019] Figure 3 This is a schematic diagram of the metal magnetic ring structure with a single cable provided by an embodiment of the present invention.
[0020] In the figure:
[0021] 10: Ferrite core; 20: Grounding part;
[0022] 11: Perforation; 21: Conductive foam ring;
[0023] A: Data current; B: Noise current; C: Data current magnetic field; D: Noise current magnetic field. Specific embodiments
[0024] To make the objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.
[0025] An embodiment of the present invention provides a metal magnetic ring structure, including a ferrite core and a grounding part; when in use, the ferrite core needs to be sleeved on a current-carrying cable, and the ferrite core is connected to the grounding electrode of the cable system through the grounding part. The ferrite core is used as a low-pass filter to block high-frequency current and can effectively suppress high-frequency noise.
[0026] The following will describe in detail the structures of the metal magnetic ring structure provided by the embodiments of the present invention, the connection relationships and positional relationships between the structures with reference to the accompanying drawings.
[0027] As Figures 1 to 3 shown, in the embodiment of the present invention, the ferrite core 10 includes a perforation 11, and the perforation 11 is used to be sleeved on the outer wall of the cable. The material of the ferrite core 10 is a ferrite magnetic material.
[0028] Among them, the impedance is proportional to the change in frequency. The impedance of an ordinary coil is mostly the reactance (X) component, while the impedance of the ferrite core 10 is mostly the resistance (R) component. According to the impedance and frequency change curve, for the ferrite core 10 made of ferrite material, the effect of consuming noise energy by magnetic loss is significant.
[0029] When the ferrite core 10 is in use, it is connected to a cable and used as a low-pass filter to block high-frequency current, so as to effectively suppress high-frequency noise. The principle of noise suppression is as follows: when current passes through the ferrite core 10, magnetic flux will be generated on the ferrite core 10, and the current energy is converted into magnetic energy; when the current changes, the magnetic flux will be converted back into current through electromagnetic induction. At this time, not all of the magnetic flux energy returns to the current energy, and some are lost as magnetic loss, that is, hysteresis loss. Based on this, the noise energy can be consumed through hysteresis loss, so as to achieve the purpose of noise suppression.
[0030] In the embodiment of the present invention, the grounding member 20 is connected to the ferrite core 10 and is used to connect to the grounding electrode of the system connected to the ferrite core 10. For example, the grounding member 20 includes a conductive foam ring 21, and the cross-sectional shape of the conductive foam ring 21 is rectangular; the top side of the conductive foam ring 21 is located in the through hole 11, is arranged along the center line direction of the through hole 11, and fits with the inner wall of the through hole 11. The bottom side of the conductive foam ring 21 is located outside the outer wall of the ferrite core 10 and fits with the outer wall of the ferrite core 10. The two side edges of the conductive foam ring 21 are respectively in contact with the side ends of the outer wall of the ferrite core 10 on the same side.
[0031] The conductive foam ring 21 is sleeved on the ferrite core 10. Among them, the conductive foam ring 21 has a certain width and thickness, and the bottom edge of the conductive foam ring 21 on the bottom surface is used to connect to the grounding electrode of the system connected to the ferrite core 10. For example, the bottom edge of the conductive foam ring 21 can be connected to the grounding electrode of the system by means of bonding or abutting.
[0032] In the embodiment of the present invention, the ferrite core 10 is cylindrical, and the cross-sectional shape of the through hole 11 is circular; and the center line of the through hole 11 coincides with the axis of the ferrite core 10. The impedance of the ferrite core 10 is mainly determined according to the external dimensions of the ferrite core 10, that is, determined by the length of the ferrite core 10, the diameter of the ferrite core 10, and the diameter of the through hole 11. Specifically
[0033]
[0034] Among them, N is the number of turns, Ae is the cross-sectional area of the ferrite core 10, and le is the magnetic path length of the ferrite core 10;
[0035]
[0036] Wherein, H is the length of the ferrite core 10, A is the diameter of the ferrite core 10, and B is the aperture diameter B of the perforation 11.
[0037] For example, the diameter range of the ferrite core 10 is from 4 mm to 8 mm, the length range of the ferrite core 10 is from 10 mm to 14 mm; the aperture diameter range of the perforation 11 is from 2 mm to 4 mm. Preferably, the diameter of the ferrite core 10 is 6 mm, the length of the ferrite core 10 is 12 mm, and the aperture diameter of the perforation 11 is 3 mm.
[0038] For example, the width range of the conductive foam ring 21 is from 1 mm to 2 mm, and the thickness range of the conductive foam ring 21 is from 0.5 mm to 1.5 mm. Preferably, the width of the conductive foam ring 21 is 1.5 mm, and the thickness of the conductive foam ring 21 is 1 mm.
[0039] An embodiment of the present utility model provides a main board, including the above-mentioned metal magnetic force ring structure. The ferrite core 10 in the metal magnetic force ring structure is sleeved on a cable. After an external device is connected to the interface of the main board, the noise generated due to the external device can be improved.
[0040] For example, after adding the metal magnetic force ring structure, the noise suppression can be effectively improved in the frequency band below 2.4 GHz; for example, the noise suppression of the main antenna reaches 0.7 dB, and the noise suppression of the diversity antenna reaches 3.3 dB.
[0041] In the embodiment of the present utility model, by arranging the metal magnetic force ring structure on the cable, the strength of the cable can be increased, and the cable can be fixed. When the cable is routed and arranged in the system, the metal magnetic force ring structure is used for fixing, that is, the metal magnetic force ring structure can not only achieve the purpose of noise suppression, but also play other auxiliary roles.
[0042] When using the metal magnetic force ring structure on the main board for noise suppression, compared with the prior art, the number of components used for noise suppression is small, and the occupied space is small. Therefore, it can save a certain amount of space for the main board and the system where the main board is located.
[0043] In the embodiment of the present utility model, the ferrite core 10 of the metal magnetic force ring structure can be sleeved on one cable for noise suppression, or can be sleeved on multiple cables for noise suppression. For example, the cable is an existing antenna wire. As Figure 3 shown, taking one cable as an example, the figure shows that when the data circuit A and the noise current B flow through the metal magnetic force ring structure, a data current magnetic field C and a noise current magnetic field D are respectively generated.
[0044] An electronic product according to an embodiment of the present utility model includes the above-mentioned metal magnetic ring structure or the above-mentioned main board. Taking a notebook computer as an example of the electronic product, the external devices connected to the notebook computer include receivers, hard disks, etc. By setting the above-mentioned metal magnetic ring structure, the magnetic hysteresis loss is used to consume the noise energy, thereby reducing the influence of the external device on the notebook antenna.
[0045] A metal magnetic ring structure, a main board and an electronic product provided by the present utility model. When in use, the ferrite core 10 is sleeved on the cable. When current passes through the ferrite core 10, magnetic flux will be generated on the ferrite core 10, and the current energy is converted into magnetic energy; when the current changes, the magnetic flux will be converted back into current through electromagnetic induction. At this time, not all of the magnetic flux energy returns to the current energy, and some are lost as magnetic losses. Based on this principle, the current radiation can be converted into magnetic hysteresis loss to suppress noise. According to the technical solution of the present utility model, the metal magnetic ring structure is used as a low-pass filter for blocking high-frequency current, which can effectively suppress high-frequency noise; in addition, the metal magnetic ring structure is connected to the cable, which can fix the cable routing, increase the structural strength of the cable, and reduce the number of mechanical accessories, thereby increasing the system space.
[0046] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.
[0048] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered by the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.
Claims
1. A metal magnetic ring structure, characterized in that, It includes a ferrite core (10) and a grounding part (20); The ferrite core (10) includes a perforation (11) which is used to sleeved on the outer wall of a cable, and the ferrite core (10) is used to convert the current radiation on the cable into hysteresis loss; The grounding part (20) is connected to the ferrite core (10) and is used to connect to the grounding electrode of the system connected to the ferrite core (10).
2. The metal magnetic ring structure according to claim 1, characterized in that, The ferrite core (10) is cylindrical, and the cross-sectional shape of the perforation (11) is circular; and The center line of the perforation (11) coincides with the axis of the ferrite core (10).
3. The metal magnetic ring structure according to claim 2, characterized in that, The grounding part (20) includes a conductive foam ring (21), and the cross-sectional shape of the conductive foam ring (21) is rectangular; The top edge of the conductive foam ring (21) is located within the perforation (11), is arranged along the center line direction of the perforation (11), and fits against the inner wall of the perforation (11). The bottom edge of the conductive foam ring (21) is located outside the outer wall of the ferrite core (10) and fits against the outer wall of the ferrite core (10). The two side edges of the conductive foam ring (21) respectively fit against the side ends of the outer wall of the ferrite core (10) on the same side; The bottom edge of the conductive foam ring (21) is used to connect to the grounding electrode of the system connected to the ferrite core (10).
4. The metal magnetic ring structure according to claim 2, wherein The diameter range of the ferrite core (10) is from 4 mm to 8 mm, and the length range of the ferrite core (10) is from 10 mm to 14 mm; The aperture range of the perforation (11) is from 2 mm to 4 mm.
5. The metal magnetic ring structure according to claim 3, characterized in that, The width range of the conductive foam ring (21) is from 1 mm to 2 mm, and the thickness range of the conductive foam ring (21) is from 0.5 mm to 1.5 mm.
6. A main board, characterized in that, It includes the metal magnetic ring structure according to any one of claims 1 to 5.
7. The motherboard according to claim 6, characterized in that, It includes a plurality of such cables, and the ferrite core (10) is sleeved outside the plurality of cables.
8. An electronic product, characterized in that, It includes the metal magnetic ring structure according to any one of claims 1 to 5 or the main board according to claim 6 or 7.