Magnetic shielding inductor

Abstract

The invention provides a magnetic shielding type inductor. The magnetic shielding type inductor comprises a magnetic shielding shell, a primary coil, a secondary coil and a magnetism isolating ring. The magnetic shielding shell is provided with a mounting cavity and a magnetic core arranged in the mounting cavity; the primary coil and the secondary coil are both arranged in the installation cavity, the magnetic shielding shell provides physical protection for the inductor, more importantly, the magnetic shielding shell can effectively isolate an external interference magnetic field, and stability and purity of the magnetic field in the inductor are guaranteed. And the magnetic core is used as a magnetic conductive medium of an inductance effect, so that the primary coil and the secondary coil are sleeved on the magnetic core and are sequentially arranged along the axis direction of the magnetic core to form the inductance effect. The magnetic isolation ring is arranged on the magnetic core in a sleeving mode and located between the primary coil and the secondary coil, so that mutual interference of magnetic fields between the primary coil and the secondary coil is effectively avoided, and the electromagnetic performance and the magnetic field stability of the inductor are further improved.

Description

Technical Field

[0001] The present application belongs to the technical field of inductors, and more specifically, relates to a magnetically shielded inductor. Background Art

[0002] With the rapid development of electronic technology, integrated circuits, as the core components of modern electronic devices, have a performance and stability that is directly related to the operating efficiency and reliability of the entire system. As electronic products continue to evolve towards miniaturization, high performance and integration, more stringent requirements are placed on the components that make up these circuits. Inductors, as one of the indispensable components in circuits, are mainly used for functions such as energy storage, filtering, oscillation and signal transmission, and their characteristics directly affect the overall performance of the circuit.

[0003] In some application scenarios, such as portable electronic devices, high-frequency communication modules, automotive electronic systems, and high-performance computing platforms, the requirements for inductors are particularly stringent. These applications require inductors to have not only excellent electrical properties, such as high Q value (quality factor) and low loss, but also require them to have magnetic shielding function to reduce electromagnetic interference and ensure the purity of signal transmission and system stability.

[0004] However, traditional inductors have limitations in meeting all of the above requirements. For example, although traditional wound inductors can provide good current handling capabilities, they are large in size and not conducive to system integration; while thin-film inductors, although small in size, often face problems such as severe heating and high DCR when handling large currents. In addition, inductors that lack effective magnetic shielding design can easily become the source or victim of electromagnetic interference, affecting the electromagnetic compatibility of the entire system. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a magnetically shielded inductor to solve the technical problem of poor magnetic shielding effect of the inductor in the prior art.

[0006] To achieve the above purpose, the technical solution adopted in this application is:

[0007] A magnetically shielded inductor is provided, comprising:

[0008] A magnetic shielding shell having a mounting cavity and a magnetic core arranged in the mounting cavity;

[0009] The primary coil and the secondary coil are both arranged in the installation cavity, and the primary coil and the secondary coil are both sleeved on the magnetic core and arranged in sequence along the axial direction of the magnetic core;

[0010] The magnetic isolation ring is sleeved on the magnetic core and located between the primary coil and the secondary coil.

[0011] As a further improvement of the above technical solution:

[0012] Optionally, the primary coil and the secondary coil are both formed by winding a flat enameled wire in a spiral direction.

[0013] Optionally, two ends of the primary coil are first end electrodes, and the first end electrodes are led out from the main body of the primary coil and then bent along the axis direction of the primary coil;

[0014] The two ends of the secondary coil are second end electrodes. The second end electrodes are led out from the main body of the secondary coil and then bent along the axial direction of the secondary coil.

[0015] Optionally, both the first end electrode and the second end electrode are provided with a conductive coating.

[0016] Optionally, the conductive coating includes a conductive middle layer and a conductive outer layer, the conductive middle layer is plated on the copper substrate of the first end electrode and the second end electrode, and the conductive outer layer is plated on the conductive middle layer.

[0017] Optionally, the conductive middle layer is a nickel-plated layer, and the conductive outer layer is a tin / lead-plated layer.

[0018] Optionally, the two first end electrodes of the primary coil are located on the same side of the magnetic shielding shell, the two second end electrodes of the secondary coil are located on the same side of the magnetic shielding shell, and the first end electrode and the second end electrode are respectively located on both sides of the magnetic shielding shell.

[0019] Optionally, the magnetic shielding shell is a soft ferrite shell.

[0020] Optionally, the magnetically shielded inductor further includes a bottom plate, which is disposed at the bottom of the magnetically shielded shell and is enclosed together with the magnetically shielded shell to form a mounting cavity.

[0021] The beneficial effects of the magnetic shielded inductor provided by the present application are:

[0022] The magnetic shielding inductor provided in the present application includes a magnetic shielding shell, a primary coil, a secondary coil and a magnetic isolation ring. Among them, the magnetic shielding shell has an installation cavity and a magnetic core arranged in the installation cavity; the primary coil and the secondary coil are both arranged in the installation cavity, and the magnetic shielding shell not only provides physical protection for the inductor, but more importantly, it can effectively isolate the external interference magnetic field to ensure the stability and purity of the magnetic field inside the inductor. The magnetic core serves as a magnetic conductive medium for the inductance effect. Therefore, the primary coil and the secondary coil are both sleeved on the magnetic core and arranged in sequence along the axial direction of the magnetic core to form an inductance effect. The magnetic isolation ring is sleeved on the magnetic core and is located between the primary coil and the secondary coil, so as to effectively avoid mutual interference between the magnetic fields of the primary coil and the secondary coil, thereby further improving the electromagnetic performance and magnetic field stability of the inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic cross-sectional view of the magnetically shielded inductor provided in this application;

[0025] Figure 2 A schematic diagram of the main structure of the magnetically shielded inductor provided in this application;

[0026] Figure 3 A schematic diagram of the side structure of the magnetically shielded inductor provided in this application;

[0027] Figure 4 A schematic diagram of the three-dimensional structure of the magnetically shielded inductor provided in this application;

[0028] Figure 5 A schematic diagram of the three-dimensional structure of the primary coil and the secondary coil of the magnetic shielding inductor provided in the present application.

[0029] Among them, the reference numerals in the figure are:

[0030] 1. Magnetic shielding shell; 11. Installation cavity;

[0031] 12. Magnetic core; 2. Primary coil;

[0032] 21. First terminal electrode; 3. Secondary coil;

[0033] 31. Second terminal electrode; 4. Magnetic isolation ring;

[0034] 5. Base plate. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of the present invention.

[0041] In the following description, suffixes such as "module", "component", "assembly" or "unit" are used only to facilitate the description of the present invention and have no specific meanings. Therefore, they can be used in combination.

[0042] The present invention will be further described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0043] like Figures 1 to 4 As shown, the present application provides a magnetic shielding inductor, including a magnetic shielding shell 1, a primary coil 2, a secondary coil 3 and a magnetic isolation ring 4.

[0044] Among them, the magnetic shielding shell 1 has an installation cavity 11 and a magnetic core 12 arranged in the installation cavity 11; the primary coil 2 and the secondary coil 3 are both arranged in the installation cavity 11. The magnetic shielding shell 1 not only provides physical protection for the inductor, but more importantly, it can effectively isolate the external interference magnetic field to ensure the stability and purity of the magnetic field inside the inductor. The magnetic core 12 serves as a magnetic conductive medium for the inductance effect. Therefore, the primary coil 2 and the secondary coil 3 are both sleeved on the magnetic core 12 and arranged in sequence along the axial direction of the magnetic core 12 to form an inductance effect. In order to further optimize the performance of the magnetic shielding inductor of the present application, a magnetic isolation ring 4 is also provided. The magnetic isolation ring 4 is sleeved on the magnetic core 12 and is located between the primary coil 2 and the secondary coil 3, thereby effectively avoiding mutual interference between the magnetic fields of the primary coil 2 and the secondary coil 3, thereby further improving the electromagnetic performance and magnetic field stability of the inductor.

[0045] like Figure 5 As shown, in a specific embodiment of the present application, the primary coil 2 and the secondary coil 3 are both formed by winding a flat enameled wire in a spiral direction.

[0046] When winding the primary coil 2 and the secondary coil 3, the lead wires of the coils are first fixed, and then the tail wires are moved independently to complete the winding process. The coils are more elastic after winding, which can easily cause the coils to become loose, and can also easily cause damage to the coils during the encapsulation resin. In order to solve these problems, in addition to having high insulation requirements, flat enameled wires must also have self-adhesive properties to ensure that the coils can fit tightly during the winding process and are not easy to become loose. The selection of flat enameled wire must meet the following key indicators: the surface elongation must be greater than 15% to ensure that it has sufficient flexibility and ductility during the winding process; the material must be not easy to break to improve the durability of the coil; good windability is convenient for efficient winding in a limited space; after winding, the surface enamel film should remain intact, and there should be no cracking and copper exposure to ensure its insulation performance; the insulation properties must reach an excellent level, and the surface insulation withstand voltage must exceed 1600V to ensure the safe operation of the coil in a high-voltage environment; the number of pinholes should be strictly controlled to less than 5 to reduce the risk of current leakage; in addition, it must also have the characteristics of high temperature resistance, and the temperature of the softening breakdown test should be greater than 300°C to ensure the long-term stable operation of the coil in a high-temperature environment.

[0047] In a limited space, enameled wires are arranged closely to maximize space utilization. Compared with round enameled wires, flat wires can better utilize the limited winding space, and their larger surface area also helps conduct and dissipate heat to withstand larger currents.

[0048] like Figure 5 As shown, in a specific embodiment of the present application, the two ends of the primary coil 2 are first end electrodes 21. After the first end electrode 21 is led out from the main body of the primary coil 2, it is bent along the axial direction of the primary coil 2. The bending angle is about 90° to ensure good fit and stable connection between the electrode and the subsequent connection component or circuit board, while optimizing the compactness and space utilization of the overall structure. Correspondingly, the two ends of the secondary coil 3 are second end electrodes 31. After the second end electrode 31 is led out from the main body of the secondary coil 3, it is bent along the axial direction of the secondary coil 3. The bending angle is about 90° to ensure good fit and stable connection between the electrode and the subsequent connection component or circuit board, while optimizing the compactness and space utilization of the overall structure.

[0049] In a specific embodiment of the present application, a conductive coating is provided on both the first end electrode 21 and the second end electrode 31, thereby improving the conductive efficiency and welding ability of the first end electrode 21 and the second end electrode 31. Before plating the conductive coating, the paint on the first end electrode 21 and the second end electrode 31 must be removed. A laser stripping method can be used to adjust the pulse and pulse width of the laser equipment according to different wire diameters to achieve a suitable energy value; laser stripping is to use high-energy laser pulses to locally heat the material in a small area, and the paint film on the surface of the lead wire is vaporized under high temperature conditions, ensuring that the paint film is destroyed without damaging the copper wire inside the enameled wire, and the stripping area can also be controlled. Finally, a conductive coating is plated on the first end electrode 21 and the second end electrode 31 where the paint film is removed.

[0050] In a specific embodiment of the present application, the conductive coating specifically includes a conductive middle layer and a conductive outer layer to further improve the conductivity and welding reliability of the first terminal electrode 21 and the second terminal electrode 31. The conductive middle layer is plated on the copper substrate of the first terminal electrode 21 and the second terminal electrode 31.

[0051] The copper substrate, as the main part of the electrode, already has good electrical conductivity. However, in order to further improve its electrical conductivity and corrosion resistance, a material with high conductivity, good corrosion resistance and excellent adhesion is selected as the conductive middle layer, which is evenly covered on the surface of the copper substrate to form a continuous and dense conductive layer, thereby effectively improving the electrical conductivity and durability of the electrode.

[0052] A conductive outer layer is plated on top of the conductive middle layer. The conductive outer layer uses a material that is different from the conductive middle layer but also has high conductivity and good welding properties, which not only further enhances the conductivity of the electrode, but also optimizes its welding performance. The conductive outer layer can serve as a bridge between the electrode and the solder, promoting the wetting and diffusion of the solder, making the welding point more firm and reliable. At the same time, the presence of the conductive outer layer can also protect the conductive middle layer from erosion by the external environment and extend the service life of the electrode.

[0053] In a specific embodiment of the present application, the conductive middle layer is specifically a nickel-plated layer, and the conductive outer layer is specifically a tin-plated / lead-plated layer.

[0054] like Figures 1 to 4As shown, in a specific embodiment of the present application, the two first end electrodes 21 of the primary coil 2 are located on the same side of the magnetic shielding shell 1, and the two second end electrodes 31 of the secondary coil 3 are located on the same side of the magnetic shielding shell 1. The first end electrode 21 and the second end electrode 31 are respectively located on both sides of the magnetic shielding shell 1, which not only ensures that the spatial layout between the electrodes and between the electrodes and the magnetic shielding shell is reasonable and compact, but also further optimizes the overall performance and stability of the circuit system. By arranging the first end electrode 21 and the second end electrode 31 on both sides of the magnetic shielding shell 1, we can effectively reduce the electromagnetic interference between the electrodes and improve the anti-interference ability of the circuit system. At the same time, this layout also helps to achieve convenient and stable connection between the electrodes and the external circuit or connector, thereby ensuring that the circuit system can operate normally and efficiently.

[0055] In a specific embodiment of the present application, the magnetic shielding shell 1 is a soft ferrite shell. As a magnetic material, soft ferrite has high resistivity, low loss and good temperature stability, and is also easy to process and shape. The magnetic shielding shell 1 can effectively absorb, guide and shield electromagnetic interference from the outside, and provide a relatively pure and stable electromagnetic environment for internal electronic components and circuits, which not only helps to improve the performance of the entire electronic device, but also prolongs its service life.

[0056] like Figures 1 to 4 As shown, in a specific embodiment of the present application, the magnetic shielding inductor further includes a bottom plate 5. The bottom plate 5 is also made of soft ferrite. The bottom plate 5 is bonded to the bottom of the magnetic shielding shell 1, and together with the magnetic shielding shell 1, forms a mounting cavity 11.

[0057] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A magnetically shielded inductor, characterized in that: include: A magnetic shielding shell (1) comprising a mounting cavity (11) and a magnetic core (12) arranged in the mounting cavity (11); The primary coil (2) and the secondary coil (3) are both arranged in the installation cavity (11); the primary coil (2) and the secondary coil (3) are both sleeved on the magnetic core (12) and arranged in sequence along the axial direction of the magnetic core (12); The magnetic isolation ring (4) is sleeved on the magnetic core (12) and is located between the primary coil (2) and the secondary coil (3).

2. The magnetically shielded inductor according to claim 1, wherein: The primary coil (2) and the secondary coil (3) are both formed by winding a flat enameled wire in a spiral direction.

3. The magnetically shielded inductor according to claim 1, wherein: The two ends of the primary coil (2) are first end electrodes (21), and the first end electrodes (21) are led out from the main body of the primary coil (2) and then bent along the axial direction of the primary coil (2); The two ends of the secondary coil (3) are second end electrodes (31); the second end electrodes (31) are led out from the main body of the secondary coil (3) and then bent along the axial direction of the secondary coil (3).

4. The magnetically shielded inductor according to claim 3, wherein: The first end electrode (21) and the second end electrode (31) are both provided with a conductive coating.

5. The magnetically shielded inductor according to claim 4, wherein: The conductive coating comprises a conductive middle layer and a conductive outer layer, the conductive middle layer is plated on the copper substrate of the first end electrode (21) and the second end electrode (31), and the conductive outer layer is plated on the conductive middle layer.

6. The magnetically shielded inductor according to claim 5, wherein: The conductive middle layer is a nickel-plated layer, and the conductive outer layer is a tin-plated / lead-plated layer.

7. The magnetically shielded inductor according to claim 3, wherein: The two first end electrodes (21) of the primary coil (2) are located on the same side of the magnetic shielding shell (1), the two second end electrodes (31) of the secondary coil (3) are located on the same side of the magnetic shielding shell (1), and the first end electrode (21) and the second end electrode (31) are respectively located on both sides of the magnetic shielding shell (1).

8. The magnetically shielded inductor according to any one of claims 1 to 7, wherein: The magnetic shielding shell (1) is a soft ferrite shell.

9. The magnetically shielded inductor according to any one of claims 1 to 7, wherein: It also comprises a bottom plate (5), wherein the bottom plate (5) is arranged at the bottom of the magnetic shielding shell (1) and together with the magnetic shielding shell (1) forms an installation cavity (11).

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