Anti-magnetic saturation magnetic core structure of high-frequency inductor

Abstract

The utility model relates to the technical field of electronic components, and concretely relates to the magnetic core structure of the prevention of magnetic saturation of high-frequency inductance, including the magnetic core main part, the magnetic core main part is composed of the outer ring magnetic core and the magnetic core middle column of setting at the outer ring magnetic core center position, a plurality of sectional air gap is provided on the surface of magnetic core middle column, and the air gap is filled with the leakage magnetic diffusion angle suppression strip in section, a plurality of magnetic shunt grooves are provided on the inner side surface of outer ring magnetic core, and the slope alloy piece is fixedly installed on the groove wall of magnetic shunt groove, the magnetic core main part is the layered composite structure, and the inside and outside are nanocrystalline alloy layer, ferrite layer and amorphous alloy layer in proper order, the upper surface of bottom support seat is detachably installed with the shield, and the shield covers the magnetic core main part inside. The utility model has the advantages of preventing magnetic saturation, and can reduce the magnetic core loss and eddy current loss.

Description

Technical Field

[0001] This utility model relates to the field of electronic component technology, and more specifically, to an antimagnetic saturation magnetic core structure for high-frequency inductors. Background Technology

[0002] High-frequency inductors play important roles in high-frequency circuits, such as energy storage, filtering, and signal coupling. Their performance directly affects the stability of the entire circuit system. Magnetic saturation is a key bottleneck that restricts the improvement of high-frequency inductor performance: when the magnetic flux density of the core exceeds the saturation value, the inductance will decrease sharply, leading to problems such as current distortion and a sharp drop in efficiency. In severe cases, it may even cause circuit failure.

[0003] Among the existing anti-magnetic saturation technologies, the single air gap magnetic core structure is the most widely used, but it has insurmountable defects. On the one hand, in order to improve the anti-saturation capability, the air gap width needs to be increased, which will lead to a sharp increase in leakage flux. This will not only increase the magnetic core loss by more than 30%, but also generate additional eddy current losses due to leakage flux cutting the coil, thus reducing the inductance conversion efficiency.

[0004] On the other hand, a single air gap can cause severe uneven distribution of the magnetic field inside the core. The magnetic field strength at the edge of the air gap can be 5-8 times that of the central region, which can easily lead to local magnetic saturation under high-frequency and high-current conditions. In addition, traditional magnetic cores often use a single magnetic material, which cannot simultaneously address high-frequency losses and anti-saturation capabilities. In view of this, we propose an anti-magnetic-saturation core structure for high-frequency inductors. Utility Model Content

[0005] The purpose of this invention is to provide a magnetic core structure for high-frequency inductors that is protected against magnetic saturation, so as to solve the defects mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A magnetic core structure for high-frequency inductors with anti-magnetic saturation includes a core body, which consists of an outer ring core and a core post located at the center of the outer ring core. Multiple segmented air gaps are provided on the surface of the core post, and these air gaps are filled with leakage flux diffusion angle suppression strips. Multiple magnetic shunt grooves are provided on the inner surface of the outer ring core, and permalloy sheets are fixedly installed on the groove walls. The core body has a layered composite structure, consisting of a nanocrystalline alloy layer, a ferrite layer, and an amorphous alloy layer, from the inside out.

[0008] Preferably, a spiral heat dissipation channel is provided on the annular side of the outer ring magnetic core, and the spiral heat dissipation channel is spiral in shape;

[0009] This setting enables heat dissipation.

[0010] Preferably, the cross-section of the spiral heat dissipation channel is an isosceles trapezoid, and a graphene heat-conducting strip is fixedly installed on the inner wall of the spiral heat dissipation channel;

[0011] This setting can further improve heat dissipation.

[0012] Preferably, the width of a single segmented air gap is between 0.1 and 0.3 mm, and the air gap spacing between two adjacent segmented air gaps is 5 to 8 times the air gap width.

[0013] Preferably, the bottom of the magnetic core body is integrally formed with a copper heat dissipation flange, which is fixedly installed on the bottom support.

[0014] Preferably, a shielding cover is detachably installed on the upper surface of the bottom support, and the shielding cover encloses the magnetic core body inside.

[0015] Preferably, a fixed base is fixedly installed at the bottom of the shielding cover, and the fixed base is detachably installed on the bottom support.

[0016] Preferably, the shielding cover consists of a permalloy shielding inner shell disposed on the inner layer and an aluminum shielding outer shell disposed on the outer side of the permalloy shielding inner shell, wherein the permalloy shielding inner shell and the aluminum shielding outer shell are integrally formed structures.

[0017] This design completely encloses the magnetic core, effectively preventing leakage flux and isolating it from external magnetic field interference.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model optimizes the magnetic field distribution inside the magnetic core by setting multiple segmented air gaps on the main body of the magnetic core and internal leakage flux diffusion angle suppression strips, combined with the permalloy sheet in the magnetic shunt groove. This avoids the problem of uneven magnetic field caused by a single air gap, reduces leakage flux, reduces magnetic core loss and eddy current loss, and achieves the effect of improving inductance conversion efficiency and preventing local magnetic saturation.

[0020] 2. This utility model achieves the goal of balancing high-frequency loss and anti-saturation capability by setting a layered composite structure for the magnetic core body, namely, a nanocrystalline alloy layer, a ferrite layer and an amorphous alloy layer from the inside out. The nanocrystalline alloy layer ensures high anti-saturation capability, the ferrite layer reduces high-frequency loss, and the amorphous alloy layer optimizes magnetic circuit conduction, thereby improving the overall performance of the magnetic core.

[0021] 3. This utility model achieves rapid heat dissipation of the magnetic core during operation by setting a spiral heat dissipation channel on the outer ring magnetic core and an internal graphene heat conduction strip, in conjunction with a copper heat dissipation flange at the bottom of the magnetic core body, thus avoiding the impact of high temperature on magnetic performance. At the same time, the permalloy shielding inner shell and aluminum shielding outer shell of the shielding cover effectively block leakage flux and external magnetic field interference, thereby ensuring the stable operation of the magnetic core. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a cross-sectional view of the magnetic core body of this utility model;

[0025] Figure 4 This is a cross-sectional view of the shielding cover of this utility model;

[0026] The meanings of the labels in the diagram are as follows:

[0027] 1. Magnetic core body; 10. Magnetic core center column; 11. Outer ring magnetic core; 12. Segmented air gap; 121. Leakage flux diffusion angle suppression strip; 13. Spiral heat dissipation channel; 131. Graphene heat conduction strip; 14. Magnetic shunt groove; 141. Permalloy sheet; 15. Copper heat dissipation flange; 16. Nanocrystalline alloy layer; 17. Ferrite layer; 18. Amorphous alloy layer;

[0028] 2. Shielding cover; 20. Fixed base; 21. Bottom support; 22. Permalloy shielding inner shell; 23. Aluminum shielding outer shell. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0030] Please see Figures 1-4This utility model provides a technical solution: a magnetic core structure for preventing magnetic saturation of a high-frequency inductor, including a core body 1. The core body 1 consists of an outer ring core 11 and a core column 10 located at the center of the outer ring core 11. Multiple segmented air gaps 12 are provided on the surface of the core column 10, and leakage flux diffusion angle suppression strips 121 are filled in the segmented air gaps 12. Multiple magnetic shunt grooves 14 are provided on the inner side of the outer ring core 11. Permalloy plates 141 are fixedly installed on the groove walls of the magnetic shunt grooves 14. With the cooperation of the permalloy plates 141, the magnetic field distribution inside the core is more uniform, the leakage flux diffusion angle is suppressed, and the permalloy plates 141 can shunt part of the magnetic flux to avoid excessive local magnetic flux density and effectively prevent magnetic saturation.

[0031] like Figure 1 and Figure 3 As shown, the magnetic core body 1 has a layered composite structure, consisting of a nanocrystalline alloy layer 16, a ferrite layer 17, and an amorphous alloy layer 18 from the inside out. The three layers are tightly bonded together with high-temperature resistant insulating adhesive to form a gradient magnetic performance structure. The nanocrystalline alloy layer 16 ensures high anti-saturation capability, the ferrite layer 17 reduces high-frequency loss, and the amorphous alloy layer 18 optimizes magnetic circuit conduction, achieving the goal of balancing high-frequency loss and anti-saturation capability, thus improving the overall performance of the magnetic core.

[0032] like Figure 1 and Figure 2 As shown, a spiral heat dissipation channel 13 is provided on the annular side of the outer ring magnetic core 11. The spiral heat dissipation channel 13 is spiral in shape, so that the heat generated by the magnetic core during operation can be dissipated along the spiral channel, which increases the heat dissipation area, accelerates the heat dissipation speed, and prevents the magnetic performance of the magnetic core from decreasing due to high temperature.

[0033] like Figure 2 As shown, the cross-section of the spiral heat dissipation channel 13 is an isosceles trapezoid. A graphene heat-conducting strip 131 is fixedly installed on the inner wall of the spiral heat dissipation channel 13. The isosceles trapezoidal structure facilitates heat transfer. The graphene heat-conducting strip 131 has excellent thermal conductivity, which further improves heat dissipation efficiency and ensures that the magnetic core works at a suitable temperature.

[0034] In this embodiment, the width of a single segmented air gap 12 is between 0.1 and 0.3 mm, and the air gap spacing between two adjacent segmented air gaps 12 is 5 to 8 times the air gap width. This size design not only ensures the anti-magnetic saturation effect, but also avoids the instability of magnetic properties caused by too many or too dense air gaps, making the magnetic core performance more reliable.

[0035] Specifically, the bottom of the magnetic core body 1 is integrally formed with a copper heat dissipation flange 15, which is fixedly installed on the bottom support 21. The copper heat dissipation flange 15 has good thermal conductivity and can quickly conduct the heat of the magnetic core body 1 to the bottom support 21, thereby enhancing the overall heat dissipation capacity. At the same time, the bottom support 21 provides stable support for the magnetic core.

[0036] Furthermore, a shielding cover 2 is detachably installed on the upper surface of the bottom support 21. The shielding cover 2 encloses the magnetic core body 1 inside, so that the magnetic core body 1 is enclosed in the shielding space, preventing the leakage flux generated by the magnetic core from leaking out, and also avoiding the interference of external magnetic fields on the magnetic core, thus ensuring stable inductance performance. The shielding cover 2 is provided with through holes for cables to pass through, so that wiring operations can be carried out normally.

[0037] like Figure 1 As shown, a fixed base 20 is fixedly installed at the bottom of the shield 2. The fixed base 20 can be detachably installed on the bottom support 21, which facilitates the installation and removal of the shield 2, makes it easier to inspect and maintain the magnetic core body 1, and enhances the practicality of the structure.

[0038] It is worth noting that the shielding cover 2 consists of a permalloy shielding inner shell 22 disposed on the inner layer and an aluminum shielding outer shell 23 disposed on the outer side of the permalloy shielding inner shell 22. The permalloy shielding inner shell 22 and the aluminum shielding outer shell 23 are integrally formed structures. The permalloy shielding inner shell 22 can effectively block magnetic fields, and the aluminum shielding outer shell 23 further enhances the shielding effect. The integrally formed structure ensures the integrity and reliability of the shielding and effectively improves the electromagnetic compatibility of the inductor. In addition, the permalloy shielding inner shell 22 and the aluminum shielding outer shell 23 themselves have thermal conductivity and can perform heat dissipation operations.

[0039] When using the anti-magnetic saturation magnetic core structure of the high-frequency inductor of this utility model, first fix the magnetic core body 1 to the bottom support 21 through the copper heat dissipation flange 15 at the bottom to ensure a stable installation; then connect the fixing base 20 of the shielding cover 2 to the bottom support 21, so that the magnetic core body 1 is wrapped by the permalloy shielding inner shell 22 and the aluminum shielding outer shell 23, and the cable passes through the through hole of the shielding cover 2 to complete the wiring.

[0040] During operation, the segmented air gap 12 of the core column 10 and the leakage flux diffusion angle suppression strip 121 suppress leakage flux, the permalloy sheet 141 in the outer ring core 11 diverts the magnetic flux to prevent saturation, and the nanocrystalline alloy layer 16, ferrite layer 17 and amorphous alloy layer 18 work together to ensure performance; heat is conducted through the graphene heat conduction strip 131 of the spiral heat dissipation channel 13 and dissipated by the copper heat dissipation flange 15.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A magnetic core structure for high-frequency inductors with anti-magnetic saturation, comprising a core body (1), characterized in that: The magnetic core body (1) consists of an outer ring magnetic core (11) and a magnetic core column (10) located at the center of the outer ring magnetic core (11). Multiple segmented air gaps (12) are provided on the surface of the magnetic core column (10), and the segmented air gaps (12) are filled with leakage flux diffusion angle suppression strips (121). Multiple magnetic shunt grooves (14) are provided on the inner side of the outer ring magnetic core (11), and permalloy sheets (141) are fixedly installed on the groove walls of the magnetic shunt grooves (14). The magnetic core body (1) is a layered composite structure, consisting of a nanocrystalline alloy layer (16), a ferrite layer (17), and an amorphous alloy layer (18) from the inside to the outside.

2. The antimagnetic saturation magnetic core structure of the high-frequency inductor according to claim 1, characterized in that: The outer ring magnetic core (11) has a spiral heat dissipation channel (13) on its annular side surface, and the spiral heat dissipation channel (13) is spiral in shape.

3. The antimagnetic saturation magnetic core structure of the high-frequency inductor according to claim 2, characterized in that: The cross-section of the spiral heat dissipation channel (13) is an isosceles trapezoid, and a graphene heat-conducting strip (131) is fixedly installed on the inner wall of the spiral heat dissipation channel (13).

4. The antimagnetic saturation magnetic core structure of the high-frequency inductor according to claim 1, characterized in that: The width of a single segmented air gap (12) is between 0.1 and 0.3 mm, and the air gap spacing between two adjacent segmented air gaps (12) is 5 to 8 times the air gap width.

5. The antimagnetic saturation magnetic core structure of the high-frequency inductor according to claim 1, characterized in that: The bottom of the magnetic core body (1) is integrally formed with a copper heat dissipation flange (15), which is fixedly installed on the bottom support base (21).

6. The antimagnetic saturation magnetic core structure of the high-frequency inductor according to claim 5, characterized in that: A shield (2) is detachably installed on the upper surface of the bottom support (21), and the shield (2) covers the magnetic core body (1) inside.

7. The antimagnetic saturation magnetic core structure of the high-frequency inductor according to claim 6, characterized in that: A fixed base (20) is fixedly installed at the bottom of the shield (2), and the fixed base (20) is detachably installed on the bottom support (21).

8. The antimagnetic saturation magnetic core structure of the high-frequency inductor according to claim 6, characterized in that: The shield (2) consists of a permalloy shield inner shell (22) disposed on the inner layer and an aluminum shield outer shell (23) disposed on the outer side of the permalloy shield inner shell (22). The permalloy shield inner shell (22) and the aluminum shield outer shell (23) are integrally formed structures.

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