A 5G high-efficiency PFC inductor

Abstract

The present invention relates to the technical field of inductors, and particularly relates to a 5G high-efficiency PFC inductor, which includes a silicon steel core and a coil wound around the silicon steel core; first connecting pieces and second connecting pieces are respectively connected to both sides of the coil; an insulating film is provided at the bottom of the silicon steel core; the 5G high-efficiency PFC inductor further includes a first copper strip and a second copper strip respectively connected to the first connecting piece and the second connecting piece; the first copper strip and the second copper strip both penetrate through the insulating film; air ducts are provided between both ends of the coil and the silicon steel core. By leaving air ducts between the coil and the silicon steel core, the present invention is beneficial to the heat dissipation of the silicon steel core, thereby improving the inductor efficiency; in addition, by using the first copper strip and the second copper strip for signal transmission, the current-carrying capacity of the inductor can be increased and heat dissipation is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of inductors, and particularly to a 5G high-efficiency PFC inductor. Background Art

[0002] With the development of communication information, 5G technology has gradually entered people's lives. In the field of 5G, such as in 5G mobile phones or 5G base stations, PFC inductors are often required. During the use of PFC inductors, heat is easily generated, and the current PFC inductors have poor heat dissipation performance, thus affecting the inductance efficiency of the inductor and reducing the efficiency of 5G devices. Summary of the Invention

[0003] The purpose of the present invention is to address the above deficiencies in the prior art and provide a 5G high-efficiency PFC inductor.

[0004] The purpose of the present invention is achieved through the following technical solutions: A 5G high-efficiency PFC inductor includes a silicon steel core and a coil wound around the silicon steel core; a first connecting piece and a second connecting piece are respectively connected to both sides of the coil;

[0005] An insulating film is provided at the bottom of the silicon steel core; the 5G high-efficiency PFC inductor further includes a first copper strip and a second copper strip respectively connected to the first connecting piece and the second connecting piece; the first copper strip and the second copper strip both penetrate through the insulating film;

[0006] Air ducts are provided between both ends of the coil and the silicon steel core.

[0007] The present invention is further configured such that a first fixing glue is provided between the silicon steel core, the insulating film, the first copper strip, and the second copper strip.

[0008] The present invention is further configured such that a second fixing glue is provided between the silicon steel core and the insulating film; the first fixing glue and the second fixing glue are respectively provided on both sides of the silicon steel core.

[0009] The present invention is further configured such that the shapes of the first connecting piece and the second connecting piece are both U-shaped.

[0010] The present invention is further configured such that the silicon steel core is stacked by a plurality of E-shaped sheets and a plurality of I-shaped sheets; first wire-passing holes are respectively provided on both sides of one end of the E-shaped sheet away from the I-shaped sheet; second wire-passing holes are respectively provided on both sides of the I-shaped sheet.

[0011] The present invention is further configured such that one end of the E-shaped sheet away from the I-shaped sheet is provided with a first U-shaped positioning hole; the first U-shaped positioning hole is provided between the two first wire-passing holes; a second U-shaped positioning hole is provided between the two second wire-passing holes of the I-shaped sheet.

[0012] The present invention is further configured such that clamping grooves are respectively provided on both sides of one end of the E sheet close to the I sheet; clamping buckles respectively engaged with the clamping grooves are provided on both sides of the I sheet.

[0013] Advantages of the present invention: By leaving an air duct between the coil and the silicon steel core, it is beneficial to the heat dissipation of the silicon steel core, thereby improving the inductance efficiency; in addition, by using the first copper strip and the second copper strip for signal transmission, the current-carrying capacity of the inductor can be increased and heat dissipation is facilitated. Description of the Drawings

[0014] The invention is further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the following drawings without creative efforts.

[0015] Figure 1 is a schematic structural diagram of the present invention;

[0016] Figure 2 is a front view of the present invention;

[0017] Figure 3 is an exploded structural view of the E sheet and the I sheet of the present invention;

[0018] Wherein: 1, silicon steel core; 2, coil; 31, first connecting piece; 32, second connecting piece; 4, insulating film; 51, first copper strip; 52, second copper strip; 6, air duct; 71, first fixing glue; 72, second fixing glue; 8, E sheet; 81, first wire threading hole; 82, first U-shaped positioning hole; 83, clamping groove; 9, I sheet; 91, second wire threading hole; 92, second U-shaped positioning hole; 93, clamping buckle. Detailed Embodiments

[0019] The present invention is further described in conjunction with the following embodiments.

[0020] As Figures 1 to 3 can be seen, a 5G high-efficiency PFC inductor described in this embodiment includes a silicon steel core 1 and a coil 2 wound around the silicon steel core 1; first connecting pieces 31 and second connecting pieces 32 are respectively connected to both sides of the coil 2;

[0021] An insulating film 4 is provided at the bottom of the silicon steel core 1; the 5G high-efficiency PFC inductor further includes a first copper strip 51 and a second copper strip 52 respectively connected to the first connecting piece 31 and the second connecting piece 32; the first copper strip 51 and the second copper strip 52 both penetrate through the insulating film 4;

[0022] Air ducts 6 are provided between both ends of the coil 2 and the silicon steel core 1.

[0023] Specifically, for the 5G high-efficiency PFC inductor described in this embodiment, by leaving an air duct 6 between the coil 2 and the silicon steel core 1, it is beneficial to the heat dissipation of the silicon steel core 1, thereby improving the inductor efficiency. In addition, in this embodiment, the first copper strip 51 and the second copper strip 52 are used for signal transmission, which can increase the current-carrying capacity of the inductor and is beneficial to heat dissipation. In addition, the process scheme of using copper strips and the insulating film 4 can improve production efficiency and has good consistency.

[0024] For the 5G high-efficiency PFC inductor described in this embodiment, a first fixing glue 71 is provided between the silicon steel core 1, the insulating film 4, the first copper strip 51 and the second copper strip 52. For the 5G high-efficiency PFC inductor described in this embodiment, a second fixing glue 72 is provided between the silicon steel core 1 and the insulating film 4; the first fixing glue 71 and the second fixing glue 72 are respectively arranged on both sides of the silicon steel core 1. Through the above settings, it is convenient to fix the silicon steel core 1, the insulating film 4, the first copper strip 51 and the second copper strip 52.

[0025] For the 5G high-efficiency PFC inductor described in this embodiment, the shapes of the first connecting piece 31 and the second connecting piece 32 are both U-shaped. The above settings facilitate the connection of the first connecting piece 31 and the second connecting piece 32 to the first copper strip 51 and the second copper strip 52 respectively.

[0026] For the 5G high-efficiency PFC inductor described in this embodiment, the silicon steel core 1 is formed by stacking a plurality of E-shaped sheets 8 and a plurality of I-shaped sheets 9; first threading holes 81 are respectively provided on both sides of one end of the E-shaped sheet 8 away from the I-shaped sheet 9; second threading holes 91 are respectively provided on both sides of the I-shaped sheet 9. Specifically, by providing the first threading holes 81 and the second threading holes 91 on the E-shaped sheet 8 and the I-shaped sheet 9 respectively, it is convenient for wire leading during inductor assembly, thereby improving wire leading efficiency.

[0027] For the 5G high-efficiency PFC inductor described in this embodiment, a first U-shaped positioning hole 82 is provided at one end of the E-shaped sheet 8 away from the I-shaped sheet 9; the first U-shaped positioning hole 82 is provided between the two first threading holes 81; a second U-shaped positioning hole 92 is provided between the two second threading holes 91 on the I-shaped sheet 9. Specifically, by providing the first U-shaped positioning hole 82 and the second U-shaped positioning hole 92 on the E-shaped sheet 8 and the I-shaped sheet 9 respectively, it is convenient for positioning during lamination, improving the efficiency and precision of the lamination process.

[0028] For the 5G high-efficiency PFC inductor described in this embodiment, clamping grooves 83 are respectively provided on both sides of one end of the E-shaped sheet 8 close to the I-shaped sheet 9; clamping buckles 93 are respectively provided on both sides of the I-shaped sheet 9 and are clamped with the clamping grooves 83. In this embodiment, the E-shaped sheet 8 and the I-shaped sheet 9 are connected by a snap connection method, getting rid of the dependence on argon arc welding, improving production efficiency and reducing costs; in addition, an interference fit is formed between the E-shaped sheet 8 and the I-shaped sheet 9, and the connection is firm, which can meet the relevant product standards.

[0029] In addition, during the processing of the silicon steel core 1 of the 5G high-efficiency PFC inductor described in this embodiment, internal stress is likely to be generated, which changes the local metallographic structure, reduces the magnetic permeability, and increases the hysteresis loss. Therefore, annealing treatment is required to eliminate the internal stress and restore the electromagnetic properties of the material itself. However, after annealing, the surface of the silicon steel core 1 is prone to a series of problems such as turning white, yellow, red, and caking.

[0030] Therefore, the silicon steel core 1 of this embodiment adopts the following annealing process:

[0031] Example 1

[0032] An annealing process for a silicon steel core 1 includes the following steps:

[0033] (1) Load the silicon steel core 1 into the furnace liner and lift it into the annealing furnace. Heat it to 600 °C, hold for 1.5 h, and replace the nitrogen in the furnace liner to remove oil fume.

[0034] (2) Continue to heat the silicon steel core 1 to 770 °C, and then hold for 2.5 h.

[0035] (3) Transfer the furnace liner to the heat preservation pit for cooling. After the silicon steel core 1 cools to 310 °C, evacuate the furnace liner, then open the air inlet valve of the furnace liner to introduce air, and control the air flow rate to be 5 m 3 / h;

[0036] (4) When the furnace liner returns to normal pressure, take out the silicon steel core 1 and let it cool naturally in the air.

[0037] Among them, in the step (1), the nitrogen gas pressure in the furnace liner is 0.06 MPa.

[0038] Among them, in the step (1), the nitrogen gas flow rate is controlled at 5 m 3 / h during the air replacement process.

[0039] Among them, in the step (3), the cooling rate of the furnace liner in the heat preservation pit is controlled at 25 °C / min.

[0040] Among them, the silicon steel core 1 is made of the following components by weight percentage: 6 wt% of silicon powder, and the balance is iron powder.

[0041] Among them, the purity of the iron powder is greater than 90.5%, and the purity of the silicon powder is greater than 99%.

[0042] Among them, the particle size of the iron powder is 80 mesh, and the particle size of the silicon powder is 450 mesh.

[0043] Among them, the preparation method of the silicon steel core 1 includes the following steps: A. Mix silicon powder and iron powder according to the ratio under the protection atmosphere of inert gas to obtain a mixed powder; B. Roll the mixed powder to roll out a strip blank with a thickness of 0.4 mm and a density of 6.1 g / cm 3 ; C. Sinter the strip blank in vacuum at 1050 °C for 1.5 h, and then sinter it in vacuum at 1200 - 1300 °C for 2 - 3 h to obtain a strip.

[0044] Example 2

[0045] An annealing process for the silicon steel core 1 includes the following steps:

[0046] (1) Load the silicon steel core 1 into the furnace liner and lift it into the annealing furnace, heat it to 600 °C, keep it warm for 1.5 h, and ventilate the nitrogen in the furnace liner to remove oil fume;

[0047] (2) Continue to heat the silicon steel core 1 to 770 °C, and then keep it warm for 2.5 h;

[0048] (3) Transfer the furnace liner to the heat preservation pit for cooling. After the silicon steel core 1 cools down to 310 °C, evacuate the furnace liner, and then open the intake valve of the furnace liner to introduce air, and control the air flow rate to be 5 m 3 / h;

[0049] (4) When the furnace liner returns to normal pressure, take out the silicon steel core 1 and let it cool naturally in the air.

[0050] Among them, in the step (1), the nitrogen gas pressure in the furnace liner is 0.06 MPa.

[0051] Among them, in the step (1), the nitrogen gas flow rate is controlled at 5 m 3 / h during the ventilation process.

[0052] Among them, in the step (3), the cooling rate of the furnace liner in the heat preservation pit is controlled at 25 °C / min.

[0053] Among them, the silicon steel core 1 is made of the following components by weight percentage: 2 wt% of aluminum powder, 4.5 wt% of silicon powder, 1.5 wt% of boron powder, and the balance is iron powder.

[0054] Among them, the purity of the iron powder is greater than 90.5%, the purity of the aluminum powder is greater than 99%, the purity of the silicon powder is greater than 99%, and the purity of the boron powder is greater than 99%.

[0055] Among them, the particle size of the iron powder is 80 mesh, the particle size of the aluminum powder is 7.5 μm, the particle size of the silicon powder is 450 mesh, and the particle size of the boron powder is 15 μm.

[0056] Among them, the preparation method of the silicon steel core 1 includes the following steps: A. Mix aluminum powder, silicon powder, boron powder and iron powder according to the ratio under the protection atmosphere of inert gas to obtain a mixed powder; B. Roll the mixed powder to roll out a strip blank with a thickness of 1.1 mm and a density of 6.2 g / cm 3 of the strip blank; C. Vacuum sinter the strip blank at 1050 °C for 1.5 h, and then vacuum sinter it at 1250 °C for 2.5 h to obtain a strip; D. Cold roll the strip multiple times until the thickness of the strip is reduced to 0.4 mm, that is, the silicon steel core 1 is obtained.

[0057] Example 3

[0058] An annealing process for the silicon steel core 1 includes the following steps:

[0059] (1) Load the silicon steel core 1 into the furnace liner and lift it into the annealing furnace, heat it to 500 °C, keep it warm for 2 h, and replace the nitrogen in the furnace liner to remove oil fume;

[0060] (2) Continue to heat the silicon steel core 1 to 750 °C, and then keep it warm for 3 h;

[0061] (3) Transfer the furnace liner to the heat preservation pit for cooling. After the silicon steel core 1 cools down to 300 °C, evacuate the furnace liner, and then open the air inlet valve of the furnace liner to introduce air, and control the air flow rate to be 4 m 3 / h;

[0062] (4) When the furnace liner returns to normal pressure, take out the silicon steel core 1 and let it cool naturally in the air.

[0063] Among them, in the step (1), the nitrogen gas pressure in the furnace liner is 0.04 MPa.

[0064] Among them, in the step (1), the nitrogen gas flow rate is controlled at 4 m 3 / h during the air replacement process.

[0065] Among them, in the step (3), the cooling rate of the furnace liner in the heat preservation pit is controlled at 20 °C / min.

[0066] Among them, the silicon steel core 1 is made of the following components by weight percentage: 1 wt% of aluminum powder, 4 wt% of silicon powder, 1 wt% of boron powder, and the balance is iron powder.

[0067] Among them, the purity of the iron powder is greater than 90.5%, the purity of the aluminum powder is greater than 99%, the purity of the silicon powder is greater than 99%, and the purity of the boron powder is greater than 99%.

[0068] Among them, the particle size of the iron powder is 60 mesh, the particle size of the aluminum powder is 5 μm, the particle size of the silicon powder is 300 mesh, and the particle size of the boron powder is 10 μm.

[0069] Among them, the preparation method of the silicon steel core 1 includes the following steps: A. Mix aluminum powder, silicon powder, boron powder and iron powder according to the ratio under the protection atmosphere of inert gas to obtain a mixed powder; B. Roll the mixed powder to roll out a strip blank with a thickness of 0.75 mm and a density of 6.0 g / cm 3 ; C. Sinter the strip blank in vacuum at 1000 °C for 2 h, and then sinter it in vacuum at 1200 °C for 3 h to obtain a strip; D. Cold roll the strip multiple times until the thickness of the strip is reduced to 0.3 mm, that is, the silicon steel core 1 is obtained.

[0070] Example 4

[0071] An annealing process for a silicon steel core 1 includes the following steps:

[0072] (1) Load the silicon steel core 1 into the furnace liner and lift it into the annealing furnace, heat it to 700 °C, keep it warm for 1 h, and replace the nitrogen in the furnace liner to remove oil fume;

[0073] (2) Continue to heat the silicon steel core 1 to 800 °C, and then keep it warm for 2 h;

[0074] (3) Transfer the furnace liner to the heat preservation pit for cooling. After the silicon steel core 1 cools down to 315 °C, evacuate the furnace liner, and then open the intake valve of the furnace liner to introduce air, and control the flow rate of the air to be 6 m 3 / h;

[0075] (4) When the furnace liner returns to normal pressure, take out the silicon steel core 1 and let it cool naturally in the air.

[0076] Among them, in the step (1), the nitrogen gas pressure in the furnace liner is 0.08 MPa.

[0077] Among them, in the step (1), the nitrogen gas flow rate is controlled at 6 m 3 / h during the air replacement process.

[0078] Among them, in the step (3), the cooling rate of the furnace liner in the heat preservation pit is controlled at 30 °C / min.

[0079] Among them, the silicon steel core 1 is made of the following components by weight percentage: 3 wt% of aluminum powder, 5 wt% of silicon powder, 2 wt% of boron powder, and the balance is iron powder.

[0080] Among them, the purity of the iron powder is greater than 90.5%, the purity of the aluminum powder is greater than 99%, the purity of the silicon powder is greater than 99%, and the purity of the boron powder is greater than 99%.

[0081] Among them, the particle size of the iron powder is 100 mesh, the particle size of the aluminum powder is 10 μm, the particle size of the silicon powder is 600 mesh, and the particle size of the boron powder is 20 μm.

[0082] Among them, the preparation method of the silicon steel core 1 includes the following steps: A. Mix aluminum powder, silicon powder, boron powder and iron powder according to the ratio in an inert gas protection atmosphere to obtain a mixed powder; B. Roll the mixed powder to roll out a strip blank with a thickness of 1.5 mm and a density of 6.4 g / cm 3 ; C. Sinter the strip blank in vacuum at 1100 °C for 1 h, and then sinter it in vacuum at 1300 °C for 2 h to obtain a strip; D. Cold-roll the strip multiple times until the thickness of the strip is reduced to 0.5 mm, that is, the silicon steel core 1 is obtained.

[0083] Comparative Example 1

[0084] The difference between this comparative example and Example 1 is that:

[0085] Among them, the silicon steel core 1 is made of components with the following weight percentages: 4.5 wt% of silicon powder, 1.5 wt% of boron powder, and the balance is iron powder.

[0086] Among them, the purity of the iron powder is greater than 90.5%, the purity of the silicon powder is greater than 99%, and the purity of the boron powder is greater than 99%.

[0087] Among them, the particle size of the iron powder is 80 mesh, the particle size of the silicon powder is 450 mesh, and the particle size of the boron powder is 15 μm.

[0088] Among them, the preparation method of the silicon steel core 1 includes the following steps: A. Mix silicon powder, boron powder and iron powder according to the ratio in an inert gas protection atmosphere to obtain a mixed powder; B. Roll the mixed powder to roll out a strip blank with a thickness of 1.1 mm and a density of 6.2 g / cm 3 ; C. Sinter the strip blank in vacuum at 1050 °C for 1.5 h, and then sinter it in vacuum at 1250 °C for 2.5 h to obtain a strip; D. Cold-roll the strip multiple times until the thickness of the strip is reduced to 0.4 mm, that is, the silicon steel core 1 is obtained.

[0089] Comparative Example 2

[0090] The difference between this comparative example and Example 1 is

[0091] Among them, the silicon steel core 1 is made of components with the following weight percentages: 2 wt% of aluminum powder, 6 wt% of silicon powder, and the balance is iron powder.

[0092] Among them, the purity of the iron powder is greater than 90.5%, the purity of the aluminum powder is greater than 99%, and the purity of the silicon powder is greater than 99%.

[0093] Among them, the particle size of the iron powder is 80 mesh, the particle size of the aluminum powder is 7.5 μm, and the particle size of the silicon powder is 450 mesh.

[0094] Among them, the preparation method of the silicon steel core 1 includes the following steps: A. Mix the aluminum powder, silicon powder and iron powder in proportion under the protection of inert gas to obtain a mixed powder; B. Roll the mixed powder to roll out a strip blank with a thickness of 1.1 mm and a density of 6.2 g / cm 3 ; C. Vacuum sinter the strip blank at 1050 °C for 1.5 h, and then vacuum sinter at 1250 °C for 2.5 h to obtain a strip; D. Cold roll the strip multiple times until the thickness of the strip is reduced to 0.4 mm, that is, the silicon steel core 1 is obtained.

[0095] The magnetic properties of the silicon steel produced by the annealing process in Examples 1-2 and Comparative Examples 1-2 are shown in the following table:

[0096]

[0097]

[0098] From the comparison between Example 1 and Example 2, it can be seen that the present invention has better magnetic property performance compared with the general high-silicon silicon steel core 1; from the comparison between Example 1 and Comparative Example 1, it can be seen that after the addition of aluminum powder is missing, boron powder is likely to appear in the precipitated state in iron, so it will also cause the brittleness of the silicon steel sheet to increase, the processing difficulty to increase, and the density of the core after sintering is not high, so the magnetic properties are not outstanding, but compared with the general high-silicon silicon steel core 1, it still has better performance; from the comparison between Example 1 and Comparative Example 2, it can be seen that the addition of aluminum powder has no benefit to the magnetic properties of the silicon steel core 1, and the magnetic property performance decreases significantly. (1) Place the silicon steel core 1 into the furnace chamber and lift it into the annealing furnace, heat it to 600 °C, keep it warm for 1.5 h, and replace the nitrogen in the furnace chamber to remove oil fume;

[0099] (2) Continue to heat the silicon steel core 1 to 770 °C, and then keep it warm for 2.5 h;

[0100] (3) Transfer the furnace chamber to the heat preservation pit for cooling. After the silicon steel core 1 cools down to 310 °C, evacuate the furnace chamber, then open the intake valve of the furnace chamber to introduce air, and control the air flow rate to be 5 m 3 / h;

[0101] (4) When the furnace chamber returns to normal pressure, take out the silicon steel core 1 and let it cool naturally in the air.

[0102] Among them, in the step (1), the nitrogen gas pressure in the furnace chamber is 0.06 MPa.

[0103] Among them, in the step (1), the nitrogen gas flow rate during the air exchange process is controlled at 5 m 3 / h.

[0104] Among them, in the step (3), the cooling rate of the furnace lining in the heat preservation pit is controlled at 25 °C / min.

[0105] Among them, the silicon steel core 1 is made of components with the following weight percentages: 6 wt% of silicon powder, and the balance is iron powder.

[0106] Among them, the purity of the iron powder is greater than 90.5%, and the purity of the silicon powder is greater than 99%.

[0107] Among them, the particle size of the iron powder is 80 mesh, and the particle size of the silicon powder is 450 mesh.

[0108] Among them, the preparation method of the silicon steel core 1 includes the following steps: A. Mix the silicon powder and the iron powder according to the ratio under the protection atmosphere of inert gas to obtain a mixed powder; B. Roll the mixed powder to roll out a strip blank with a thickness of 0.4 mm and a density of 6.1 g / cm 3 ; C. Sinter the strip blank in vacuum at 1050 °C for 1.5 h, and then sinter it in vacuum at 1200 - 1300 °C for 2 - 3 h to obtain a strip.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A 5G high-efficiency PFC inductor, characterized in that: it includes a silicon steel core (1) and a coil (2) wound around the silicon steel core (1); one side of the coil (2) is connected with a first connecting piece (31), and the other side of the coil (2) is connected with a second connecting piece (32); an insulating film (4) is provided at the bottom of the silicon steel core (1); the 5G high-efficiency PFC inductor further includes a first copper strip (51) connected to the first connecting piece (31) and a second copper strip (52) connected to the second connecting piece (32); both the first copper strip (51) and the second copper strip (52) pass through the insulating film (4); air ducts (6) are provided between both ends of the coil (2) and the silicon steel core (1); the shapes of both the first connecting piece (31) and the second connecting piece (32) are U-shaped; the silicon steel core (1) is stacked by a plurality of E-shaped sheets (8) and a plurality of I-shaped sheets (9); first wire-passing holes (81) are respectively provided on both sides of one end of the E-shaped sheet (8) far from the I-shaped sheet (9); second wire-passing holes (91) are respectively provided on both sides of the I-shaped sheet (9); one end of the E-shaped sheet (8) far from the I-shaped sheet (9) is provided with a first U-shaped positioning hole (82); the first U-shaped positioning hole (82) is arranged between the two first wire-passing holes (81); a second U-shaped positioning hole (92) is arranged between the two second wire-passing holes (91) of the I-shaped sheet (9); clamping grooves (83) are respectively provided on both sides of one end of the E-shaped sheet (8) close to the I-shaped sheet (9); clamping buckles (93) respectively engaged with the clamping grooves (83) are provided on both sides of the I-shaped sheet (9); the annealing process of the silicon steel core (1) includes the following steps: loading the silicon steel core (1) into the furnace liner and hoisting it into the annealing furnace, heating to 600 °C, keeping warm for 1.5 h, and replacing the nitrogen in the furnace liner to remove oil fume; continuing to heat the silicon steel core (1) to 770 °C, and then keeping warm for 2.5 h; Transfer the furnace lining to the heat preservation pit for cooling. After the silicon steel core (1) cools down to 310 °C, evacuate the furnace lining, and then open the air inlet valve of the furnace lining to introduce air, controlling the air flow rate at 5 m 3 / h; when the furnace liner returns to normal pressure, taking out the silicon steel core (1) and naturally cooling it in the air; wherein, the nitrogen gas pressure in the furnace liner is 0.06 MPa; Among them, the nitrogen flow rate during the air exchange process is controlled at 5 m 3 / h; wherein, the cooling rate of the furnace liner in the heat preservation pit is controlled at 25 °C / min; wherein, the silicon steel core (1) is made of the following components by weight percentage: 6 wt% of silicon powder, and the balance is iron powder; wherein, the purity of the iron powder is greater than 90.5%, and the purity of the silicon powder is greater than 99%; wherein, the particle size of the iron powder is 80 mesh, and the particle size of the silicon powder is 450 mesh; Among them, the preparation method of the silicon steel core (1) comprises the following steps: A. Mix silicon powder and iron powder according to a ratio under the protection atmosphere of inert gas to obtain a mixed powder; B. Roll the mixed powder to roll out a strip blank with a thickness of 0.4 mm and a density of 6.1 g / cm 3 ; C. Sinter the strip blank in vacuum at 1050 °C for 1.5 h, and then sinter it in vacuum at 1200-1300 °C for 2-3 h to obtain a strip.

2. A 5G high-efficiency PFC inductor according to claim 1, characterized in that: a first fixing glue (71) is provided between the silicon steel core (1), the insulating film (4), the first copper strip (51) and the second copper strip (52).

3. A 5G high-efficiency PFC inductor according to claim 2, characterized in that: a second fixing glue (72) is provided between the silicon steel core (1) and the insulating film (4); the first fixing glue (71) and the second fixing glue (72) are respectively arranged on both sides of the silicon steel core (1).

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