Magnetic core and PFC inductor

Abstract

The magnetic core and the PFC inductor comprise two U-shaped magnetic cores, the two U-shaped magnetic cores are in butt joint to form a closed loop, each U-shaped magnetic core comprises a connecting part and two vertical parts, the two vertical parts are arranged at the two ends of the connecting part respectively in the same direction, one end of each vertical part is connected with one end of the connecting part, and the other end of each vertical part is connected with the other end of the connecting part. The other end of each vertical part extends in the direction away from the connecting part, and the longitudinal section of each vertical part is in a drum shape or a regular octagon shape. Compared with a vertical part with a circular longitudinal section, the vertical part has the advantages that the longitudinal section of the vertical part is arranged to be drum-shaped or regular octagonal, when the U-shaped magnetic core is pressed, raw materials are placed in a magnetic core mold, and the stress of the U-shaped magnetic core is more uniform by extruding the straight surface of the connecting part, so that the density distribution of the magnetic core is uniform, and the yield of the magnetic core is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of magnetic core, specifically, relate to a magnetic core and PFC inductance. BACKGROUND

[0002] PFC inductance is used in PFC circuit, and the English full name of PFC is "Power Factor Correction", which means "power factor correction", and the power factor refers to the relationship between effective power and total power consumption (apparent power), that is, the ratio of effective power to total power consumption (apparent power). Basically, the power factor can measure the degree of effective use of electric power, and the larger the power factor value is, the higher the power utilization rate is.

[0003] PFC inductance usually has U-shaped magnetic core and ring-shaped magnetic core, and the U-shaped magnetic core is widely used because of its convenient winding. However, the existing U-shaped magnetic core usually includes a base and two vertical parts, and the winding is arranged along the vertical part. However, in the existing U-shaped magnetic core, the cross section of the vertical part is usually circular. However, the magnetic core of this structure is prone to uneven force during manufacturing, resulting in uneven density of the U-shaped magnetic core, which is prone to cracking during use, thereby reducing the service life of the U-shaped magnetic core. SUMMARY

[0004] In view of the deficiencies of the prior art, a magnetic core and a PFC inductance are provided.

[0005] To achieve the above-mentioned purpose, the utility model provides a kind of magnetic core, including two U-shaped magnetic cores, two described U-shaped magnetic cores butt joint form closed loop, each described U-shaped magnetic core includes connecting portion and two vertical parts, two described vertical parts are symmetrically arranged at the two ends of the connecting portion, one end of each described vertical part is connected with one end of the connecting portion, and the other end extends away from the connecting portion, and the longitudinal section of each described vertical part is drum-shaped or regular octagonal.

[0006] According to an embodiment of the utility model, the connecting portion and the two vertical parts are of an integral structure.

[0007] According to an embodiment of the utility model, the connecting portion and the two vertical parts are any one of metal powder core, manganese-zinc magnetic ring, nickel-zinc magnetic ring, silicon steel strip magnetic ring and nanocrystalline strip magnetic ring.

[0008] The utility model also provides a kind of PFC inductance, including above-mentioned magnetic core, still including winding, the winding is wound in the vertical part of two described U-shaped magnetic cores.

[0009] According to an embodiment of the utility model, the winding includes two groups of coils, and each group of coils is wound on the vertical part on the same side of the two U-shaped magnetic cores.

[0010] According to an embodiment of the present application, the coil adopts round wire or flat wire.

[0011] According to an embodiment of the present application, the coil adopts copper, aluminum or copper-clad aluminum material.

[0012] The present application has the advantages that, compared with the vertical part with a circular longitudinal section, the vertical part has a drum-shaped or regular octagonal longitudinal section, the raw material is placed in the magnetic core mold during pressing of the U-shaped magnetic core, the flat side of the extrusion connecting part is pressed, the stress of the U-shaped magnetic core is more uniform, the density distribution of the magnetic core is uniform, and the yield of the magnetic core is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application. In the drawings:

[0014] Figure 1 FIG. 1 is a schematic view of the magnetic core in the embodiment;

[0015] Figure 2 FIG. 2 is a schematic view of the vertical part with a drum-shaped longitudinal section in the embodiment;

[0016] Figure 3 FIG. 3 is a schematic view of the vertical part with a regular octagonal longitudinal section in the embodiment;

[0017] Figure 4 FIG. 4 is a schematic view of the PFC inductor in the embodiment.

[0018] Reference numerals

[0019] 1-U-shaped magnetic core; 11-Connecting part; 12-Vertical part; 2-Winding; 21-Coil. DETAILED DESCRIPTION

[0020] In the following, a plurality of embodiments of the present application will be disclosed with reference to the drawings. For the purpose of clear illustration, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0021] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0022] Please refer to Figure 1 , Figure 1 is a schematic view of the magnetic core. The present application provides a magnetic core, which comprises two U-shaped magnetic cores 1. When connected, the two U-shaped magnetic cores 1 are arranged opposite to each other, and the two U-shaped magnetic cores 1 are abutted with each other so that the two U-shaped magnetic cores 1 form a closed loop. Specifically, each U-shaped magnetic core 1 comprises a connecting portion 11 and two vertical portions 12, which are respectively arranged at two ends of the connecting portion 11, and the two vertical portions 12 are arranged in the same direction. One end of each vertical portion 12 is connected with one end of the connecting portion 11, and the other end thereof extends away from the connecting portion 11, so that the U-shaped magnetic core 1 has a "U" shape structure. Further, the longitudinal section of each vertical portion 12 is arranged as a drum shape or a regular octagon. It should be noted that the longitudinal section is a surface of the body 1 after the body 1 is cut along the axial direction of the body 1, and the longitudinal section is perpendicular to the horizontal plane.

[0023] Please refer to Figures 2-3 , Figure 2 is a schematic view of the vertical portion with the longitudinal section as a drum shape, Figure 3 is a schematic view of the vertical portion with the longitudinal section as a regular octagon. Compared with the vertical portion 12 with the longitudinal section as a circle, the longitudinal section of the vertical portion 12 is arranged as a drum shape or a regular octagon, so that when the U-shaped magnetic core 1 is pressed, the raw material is placed in the magnetic core mold, and the flat side of the connecting portion 11 is extruded, so that the stress of the U-shaped magnetic core 1 is more uniform, thereby making the density distribution of the magnetic core uniform, and effectively improving the yield of the magnetic core.

[0024] When the longitudinal section of the body 1 is a drum shape, it should be noted that the drum shape is formed by two vertical lines and two arc lines. During the pressing process of the body 1, the opposite sides of the body 1 are arranged as planes, which effectively reduces the stress generated by the body 1 during pressing, so that the body 1 is not easy to crack during the manufacturing of the body 1.

[0025] When the longitudinal section of the body 1 is a regular octagon, since the regular octagon is similar to a circle, when the winding 2 is arranged on the body 1, the gap between the winding 2 and the body 1 can be reduced, thereby effectively reducing the volume of the inductance. Moreover, the regular octagon is convenient for the pressing forming of the magnetic core, compared with the magnetic core with the longitudinal section as a drum shape, the stress generated by the arc edge is further reduced, so that the magnetic core is not easy to be cracked during the manufacturing of the magnetic core, thereby effectively improving the yield of the magnetic core.

[0026] At the same time, compared with the vertical portion 12 with the longitudinal section as a square, the longitudinal section of the vertical portion 12 is arranged as a drum core or a regular octagon, which reduces the gap between the winding 2 and the magnetic core, so that the consumption of the winding 2 is less, thereby effectively saving the manufacturing cost.

[0027] The vertical portion 12 is used for winding the winding 2, and the longitudinal section of the vertical portion 12 is set to be drum-shaped or octagonal. When the winding 2 is wound on the magnetic core, the gap between the winding 2 and the magnetic core is reduced, thus effectively reducing the volume of the inductor.

[0028] Preferably, the connecting portion 11 and the two vertical portions 12 of the U-shaped magnetic core 1 are an integral structure. This eliminates the need for an adhesive bonding step during the fabrication of the U-shaped magnetic core 1, effectively simplifying the manufacturing process.

[0029] Furthermore, the connecting part 11 and the two vertical parts 12 can be any one of a metal powder core, a manganese-zinc magnetic ring, a nickel-zinc magnetic ring, a silicon steel strip magnetic ring, or a nanocrystalline strip magnetic ring. Metal powder cores have the advantages of low loss and high permeability. Manganese-zinc magnetic rings have strong anti-interference capabilities and high wear resistance, effectively improving the lifespan of the magnetic core. Nickel-zinc magnetic rings have excellent high-frequency performance and low loss at high frequencies, and their low cost allows for control over the manufacturing cost of the magnetic core. Silicon steel strip magnetic rings have the advantages of high permeability and high durability, while nanocrystalline strip magnetic rings have the advantages of small size and light weight. In actual production, any one of the following can be selected according to the needs of different application scenarios: metal powder core, manganese-zinc magnetic ring, nickel-zinc magnetic ring, magnesium-zinc magnetic ring, silicon steel strip magnetic ring, or nanocrystalline strip magnetic ring.

[0030] Please refer to Figure 4 , Figure 4 This is a schematic diagram of a PFC inductor. This application also provides a PFC inductor, which includes the aforementioned magnetic core and winding 2, the winding 2 being wound around the vertical portion 12 of the two magnetic cores.

[0031] Furthermore, the winding 2 includes two sets of coils 21, each set of coils 21 being wound on the vertical portion 12 on the same side of the two magnetic cores.

[0032] The coil 21 is made of round or flat wire, preferably flat wire. Compared to a round wire coil 21, the turns of the flat coil 21 are tightly and flatly spaced. The cross-section of the flat wire is rectangular, which has a larger cross-sectional area than the circular cross-section of the round wire, allowing it to withstand a larger current and with lower resistance. In addition, the tight and flat arrangement of the turns of the flat coil 21 allows it to provide higher output power within a limited space.

[0033] Furthermore, coil 21 is made of any of the following materials: copper, aluminum, or copper-clad aluminum.

[0034] In summary, by setting the longitudinal cross-section of the vertical part 12 of the U-shaped magnetic core 1 to a drum shape or a regular octagon, the longitudinal cross-section of the vertical part 12 is made close to a circle. This reduces the gap between the coil 21 and the vertical part 12, makes the coil 21 fit more closely with the winding 2, facilitates the fabrication and shaping of the U-shaped magnetic core 1, and avoids uneven stress that could cause the U-shaped magnetic core 1 to break easily.

[0035] The above merely describes the embodiments of the present application and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A magnetic core, characterized by, The application relates to a magnetic core, which comprises: two U-shaped magnetic cores (1), the two U-shaped magnetic cores (1) are connected to form a closed loop, each U-shaped magnetic core (1) comprises a connecting part (11) and two vertical parts (12), the two vertical parts (12) are arranged on the two ends of the connecting part (11) in the same direction, one end of each vertical part (12) is connected with one end of the connecting part (11), and the other end extends away from the connecting part (11), and the longitudinal section of each vertical part (12) is drum-shaped or regular octagonal.

2. The magnetic core of claim 1, wherein, The connecting part (11) and the two vertical parts (12) are integrated.

3. The magnetic core of claim 1, wherein, The connecting part (11) and the two vertical parts (12) are any one of the following: metal powder core, manganese-zinc magnetic ring, nickel-zinc magnetic ring, silicon steel strip magnetic ring and nanocrystalline strip magnetic ring.

4. A PFC inductor characterized by, The magnetic core as claimed in any one of claims 1-3 further comprises a winding (2), and the winding (2) is arranged around the vertical parts (12) of the two U-shaped magnetic cores (1).

5. The PFC inductor of claim 4, wherein, The winding (2) comprises two groups of coils (21), and each group of coils (21) is arranged around the vertical parts (12) on the same side of the two U-shaped magnetic cores (1).

6. The PFC inductor of claim 5, wherein, The coil (21) adopts round wire or flat wire.

7. The PFC inductor of claim 5, wherein, The coil (21) adopts copper, aluminum or copper-coated aluminum.

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