Magnetic core structure
By integrating alloy and ferrite cores into a single structure, the segmented air gap technology is replaced, which solves the problems of high eddy current loss and manufacturing complexity of manganese-zinc ferrite cores. This results in lower temperature rise and loss, simplifies the process, and improves product performance and consistency.
Patent Information
- Application Number
- CN202423322390.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In the existing technology, the air gap design of manganese zinc ferrite cores is complex and difficult to be uniform, resulting in high eddy current losses, excessive temperature rise, and complex and unstable manufacturing process.
An integrated structure of alloy magnetic core and ferrite magnetic core is adopted. The alloy magnetic core is set in the middle mounting position of the ferrite magnetic core, replacing the segmented air gap technology. The low permeability and low loss characteristics of the alloy magnetic core are utilized to form an integrated alloy magnetic core structure.
It reduces temperature rise and losses, simplifies the manufacturing process, improves the DC superposition bias characteristics and consistency of the product, and reduces costs.
Smart Images
Figure CN223857976U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of transformer core technology, and in particular to a core structure. Background Technology
[0002] Magnetic components used in the design of power electronic products, such as transformers and inductors, typically use manganese-zinc ferrite as the core material. Manganese-zinc ferrite, as the main core material, has advantages such as high initial permeability, low loss in low-to-medium frequency (less than 1MHz) applications, a wide variety of magnetic materials available, and low cost.
[0003] To meet the design requirements of power electronic products, the magnetic core typically needs to be polished to create an air gap to adjust the inductance. The size of the air gap depends on both the required inductance and the need to ensure that the maximum magnetic flux density during operation does not exceed the saturation flux density of the manganese-zinc ferrite magnet. Due to the high initial permeability of manganese-zinc ferrite magnets, the air gap is usually relatively large to ensure sufficient design margin for magnetic flux density. Therefore, if... Figure 1 As shown, in the prior art, the magnetic core structure includes a magnetic core body 1 forming an air gap. On the central column 2 on one side of the magnetic core body 1, multiple layers of epoxy boards 3 or ceramic sheets and segmented air gap magnetic materials 4 with the same magnetic material as the magnetic core body 1 are spaced apart. This divides a large air gap into multiple segmented air gaps by combining epoxy boards 3 and segmented air gap magnetic materials 4, forming multiple smaller air gaps. This reduces the eddy current loss caused by the large air gap, thus reducing the problem of excessive temperature rise. However, such technology is extremely complex in the manufacturing process and is not easy to control. Moreover, the air gap cannot be evenly distributed, and the product is unstable after reliability testing.
[0004] Therefore, a new technology needs to be developed to solve the above problems. Utility Model Content
[0005] In view of this, the present invention addresses the deficiencies of the existing technology and its main purpose is to provide a magnetic core structure that replaces the existing segmented air gap technology by integrating an alloy magnetic core and a ferrite magnetic core, thereby improving the DC superposition bias characteristics of the product, reducing temperature rise, simplifying the manufacturing process, and improving consistency.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] The utility model provides a magnetic core structure, including two magnetic core bodies, the two magnetic core bodies are opposite to each and are butt-jointed together, the two magnetic core bodies all include ferrite core and alloy core, the ferrite core is concave structure, the inner side wall of ferrite core is provided with middle installation position perpendicularly to butt-jointed direction, the alloy core is set up on middle installation position, and the alloy core of two magnetic core bodies is opposite to each other.
[0008] As a preferred scheme, the alloy cores of the two magnetic core bodies abut against each other.
[0009] As a preferred scheme, an air gap is formed between the alloy cores of the two magnetic core bodies.
[0010] As a preferred scheme, the middle installation position of the ferrite core integrally protrudes a middle column, a non-ferromagnetic medium is arranged on the side of the middle column away from the middle installation position, the alloy cores of the two magnetic core bodies are integrally connected to form an integrated alloy core structure, and the two ends of the integrated alloy core structure are connected to the non-ferromagnetic mediums of the two magnetic core bodies respectively.
[0011] As a preferred scheme, the non-ferromagnetic medium is an epoxy plate or a ceramic sheet.
[0012] As a preferred scheme, the integrated alloy core structure and the middle column have the same shape, and the width of the integrated alloy core structure and the middle column in the direction perpendicular to the butt-jointed direction is the same.
[0013] As a preferred scheme, the alloy core is arranged on the middle installation position by press forming.
[0014] As a preferred scheme, the ferrite core is a PQ type ferrite core.
[0015] The utility model has apparent advantages and beneficial effects compared with the prior art, specifically speaking, from the above technical scheme, it mainly is through including ferrite core and alloy core with magnetic core body, makes alloy core set up on the middle installation position of ferrite core, makes the alloy core of two magnetic core bodies opposite to each other, so, can make its through the integration of alloy core and ferrite core, replaces the existing sectional air gap technology, because alloy core has low magnetic permeability, low loss, high Bs, excellent direct current superimposed bias characteristic and so on, thereby can improve the direct current superimposed bias characteristic of product, reduces temperature rise and loss to a greater extent, and the manufacturing process is simpler, and the consistency is better, is favorable to improve product performance and reduce cost.
[0016] To make the structure characteristics, technical means and the specific purpose and function reached by the utility model clearer, the utility model will be further explained in detail in combination with the specific embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a structural schematic diagram of a magnetic core structure of the prior art;
[0018] Figure 2 is a structural schematic diagram of embodiment one of the present application;
[0019] Figure 3 is a structural schematic diagram of embodiment two of the present application;
[0020] Figure 4 is a structural schematic diagram of embodiment three of the present application.
[0021] Explanation of the drawing:
[0022] 10, magnetic core body 11, ferrite magnetic core
[0023] 12, alloy magnetic core 13, air gap
[0024] 14, center column 15, non-ferromagnetic medium
[0025] 16, integrated alloy magnetic core structure. DETAILED DESCRIPTION
[0026] Please refer to Figures 2 to 4 , which shows the specific structure of the three embodiments of the present application.
[0027] As Figure 2 shown, in embodiment one, a magnetic core structure includes two magnetic core bodies 10, which are butted together; the two magnetic core bodies 10 each include a ferrite magnetic core 11 and an alloy magnetic core 12, the ferrite magnetic core 11 is a PQ type ferrite magnetic core 11, the ferrite magnetic core 11 has a concave structure, the inner side wall of the ferrite magnetic core 11 perpendicular to the butt joint direction is provided with a middle mounting position, the alloy magnetic core 12 is arranged on the middle mounting position by compression molding, the alloy magnetic cores 12 of the two magnetic core bodies 10 are arranged opposite to each other, so that the existing segmented air gap technology can be replaced by the integration of the alloy magnetic core 12 and the ferrite magnetic core 11, and the alloy magnetic core 12 has the advantages of low magnetic permeability, low loss, high Bs, excellent DC superimposed bias characteristics, etc., so that the DC superimposed bias characteristics of the product can be improved, the temperature rise and loss can be reduced to a greater extent, the manufacturing process is simpler, the consistency is better, which is conducive to improving the product performance and reducing the cost. In addition, the alloy magnetic cores 12 of the two magnetic core bodies 10 abut each other to realize zero air gap design according to product parameter requirements.
[0028] As Figure 3As shown in Embodiment 2, a magnetic core structure includes two magnetic core bodies 10, which are mated together. Each of the two magnetic core bodies 10 includes a ferrite core 11 and an alloy core 12. The alloy core 12 has advantages such as low permeability, low loss, high Bs, and excellent DC superposition bias characteristics, thereby improving the DC superposition bias characteristics of the product. The ferrite core 11 is a PQ-type ferrite core 11 with a concave structure. A central mounting position is provided on the inner sidewall of the ferrite core 11 perpendicular to the mating direction. The alloy core 12 is set at the central mounting position by pressing. The alloy cores 12 of the two magnetic core bodies 10 are arranged opposite each other. Furthermore, an air gap 13 is formed between the alloy cores 12 of the two magnetic core bodies 10 to achieve a small air gap design according to product parameter requirements.
[0029] like Figure 4 As shown in Embodiment 3, a magnetic core structure includes two magnetic core bodies 10, which are docked together. Each of the two magnetic core bodies 10 includes a ferrite core 11 and an alloy core 12. Since the alloy core 12 has advantages such as low permeability, low loss, high Bs, and excellent DC superposition bias characteristics, it can improve the DC superposition bias characteristics of the product. The ferrite core 11 is a PQ type ferrite core 11 with a concave structure. The inner sidewall of the ferrite core 11 perpendicular to the docking direction is provided with a central mounting position. The alloy core 12 is disposed on the central mounting position, and the alloy cores 12 of the two magnetic core bodies 10 are disposed opposite each other.
[0030] Specifically, in Embodiment 3, a central post 14 is integrally protruding from the middle mounting position of the ferrite core 11. A non-ferromagnetic medium 15 is provided on the side of the central post 14 away from the middle mounting position. The alloy cores 12 of the two core bodies 10 are integrally connected to form an integral alloy core structure 16. The two ends of the integral alloy core structure 16 are respectively connected to the non-ferromagnetic mediums 15 of the two core bodies 10. Since the permeability μ of the non-ferromagnetic medium 15 is approximately equal to μ0 (air permeability), the gap formed by these non-ferromagnetic media 15 is basically consistent with the effect of an air gap, that is, it is equivalent to setting an air gap at both ends of the alloy core 12. Furthermore, the non-ferromagnetic medium 15 is preferably an epoxy board or a ceramic sheet.
[0031] Furthermore, in Embodiment 3, the integral alloy magnetic core structure 16 and the central column 14 have the same shape, and the integral alloy magnetic core structure 16 and the central column 14 have the same width in the direction perpendicular to the docking direction.
[0032] In summary, the design of the utility model mainly is through the main body of the magnetic core including ferrite magnetic core and alloy magnetic core, makes the alloy magnetic core set up in the middle part installation position of the ferrite magnetic core, makes the alloy magnetic core of two main bodies of magnetic core relative arrangement, so, can make it through the integration of alloy magnetic core and ferrite magnetic core, replace the existing sectional air gap technology, because alloy magnetic core has low magnetic conductivity, low loss, high Bs, excellent direct current superimposed bias characteristic and other advantages, thereby can improve the direct current superimposed bias characteristic of product, reduce temperature rise and loss to a greater extent, manufacturing process is simpler, consistency is better, is favorable for improving product performance, reduces cost.
[0033] The above is only the preferred embodiment of the utility model, and does not make any limitation on the technical range of the utility model, so any slight modification, equivalent change and modification made according to the technical essence of the utility model to the above embodiment still belongs to the range of the technical scheme of the utility model.
Claims
1. A magnetic core structure comprising two magnetic core bodies which are butted against each other; characterized in that: The two magnetic core bodies each comprise a ferrite magnetic core and an alloy magnetic core, the ferrite magnetic core is in a concave structure, an inner side wall of the ferrite magnetic core perpendicular to the butt joint direction is provided with a middle mounting position, the alloy magnetic core is arranged on the middle mounting position, and the alloy magnetic cores of the two magnetic core bodies are oppositely arranged.
2. A magnetic core structure as claimed in claim 1, characterized in that: The alloy magnetic cores of the two magnetic core bodies abut against each other.
3. A magnetic core structure as claimed in claim 1, characterized in that: An air gap is formed between the alloy magnetic cores of the two magnetic core bodies.
4. A magnetic core structure as claimed in claim 1, characterized in that: The middle mounting position of the ferrite magnetic core is integrally provided with a middle column, one side of the middle column away from the middle mounting position is provided with a non-ferromagnetic medium, the alloy magnetic cores of the two magnetic core bodies are integrally connected to form an integrated alloy magnetic core structure, and two ends of the integrated alloy magnetic core structure are connected to the non-ferromagnetic mediums of the two magnetic core bodies respectively.
5. A magnetic core structure as claimed in claim 4, characterized in that: The non-ferromagnetic medium is an epoxy plate or a ceramic sheet.
6. A magnetic core structure as claimed in claim 4, characterized in that: The integrated alloy magnetic core structure and the middle column are of the same shape, and the width of the integrated alloy magnetic core structure and the middle column in a direction perpendicular to the butt joint direction is the same.
7. A magnetic core structure as claimed in claim 1, characterized in that: The alloy magnetic core is arranged on the middle mounting position by means of press forming.
8. A core structure as claimed in claim 1, characterized in that: The ferrite magnetic core is a PQ type ferrite magnetic core.