Integrally-formed inductor and preparation method and application thereof

Abstract

The invention provides an integrally-formed inductor and a preparation method and application thereof. The integrally-formed inductor comprises at least one heat dissipation copper sheet and at least one magnetic core. The heat dissipation copper sheet comprises a central electrode part, a winding part, a heat dissipation part and an outer electrode part which are integrally connected in sequence; the heat dissipation part is arranged on the outer surface of the magnetic core; the heat dissipation copper sheet is wound by taking the central electrode part as a starting point; the magnetic core is filled in the winding part of the heat dissipation copper sheet; the magnetic core is an integrally formed magnetic core. The integrally-formed inductor has the high-density characteristic, the magnetic core and the winding are tightly combined, good heat conduction and heat dissipation effects are achieved, the inductor is kept at the low working temperature, meanwhile, the heat dissipation copper sheets can dissipate heat of the inductor, and the overcurrent capacity of the inductor can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrally formed inductors, and relates to an integrally formed inductor and a preparation method and application thereof. Background Art

[0002] As electronic terminal products continue to develop in the direction of miniaturization, integration, multi-function and high power, traditional plug-in inductors can no longer meet the needs of downstream complete machines, while one-piece molded inductors with small size, low cost, low loss, excellent shielding performance, high reliability and suitable for high-density surface mounting are widely used in consumer electronics, digital products, mobile communications, computers, high-resolution TVs, set-top boxes, switches, routers, optical fiber communication equipment, broadcasting, satellites, automotive electronics and industrial control, and gradually become the mainstream direction of the inductor market. Among them, the one-piece molded inductor has a closed magnetic circuit and good magnetic shielding. It will not interfere with the surrounding components and will not be interfered by adjacent components. That is, it has good EMI performance, which is conducive to the high-density installation of components. The integrated monolithic structure has high density, good mechanical strength, high reliability, heat resistance, good solderability, regular and neat shape, and is suitable for modern automated surface mounting line production process.

[0003] CN118824695A discloses an integrally formed inductor, comprising: a winding, comprising a conductor coil, a first lead terminal and a second lead terminal, wherein the conductor coil is formed by winding a strip-shaped conductor around a receiving area in circles, and the first lead terminal and the second lead terminal are respectively electrically connected to two ends of the conductor along the winding direction; a magnetic center column, which is arranged in the receiving area of ​​the conductor coil; and a magnetic body, which is an integrally formed structural component, wherein the winding and the magnetic center column are enclosed in the magnetic body, and the first lead terminal and the second lead terminal respectively extend from the inside of the magnetic body to the outside of the magnetic body.

[0004] CN118782344A discloses an integrally formed inductor and a preparation method thereof, wherein the integrally formed inductor comprises a base magnetic powder core, a coil, a soft magnetic composite material filler and a reinforcing sheet, wherein the coil is wound on the base magnetic powder core, the coil and the base magnetic powder core are embedded in the magnetic composite material filler, the pins of the coil are formed on the outer surface of the magnetic composite material filler, and the reinforcing sheet is coated on the upper surface of the magnetic composite material filler and the outer surface except the pins.

[0005] The current passing through a single inductor of the one-piece molded inductor described in the above solution is as high as 30A, so the inductor generates severe heat. Summary of the invention

[0006] The object of the present invention is to provide an integrally formed inductor and a preparation method and application thereof. The integrally formed inductor of the present invention has high-density characteristics, and the magnetic core and the winding are tightly combined, which not only has good thermal conductivity and heat dissipation effects, so that it can maintain a low operating temperature, but also the heat dissipation copper sheet can dissipate heat for the inductor, thereby improving the inductor's current carrying capacity.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides an integrally formed inductor, at least one heat dissipation copper sheet and at least one magnetic core;

[0009] The heat dissipation copper sheet comprises a central electrode portion, a winding portion, a heat dissipation portion and an outer electrode portion which are integrally connected in sequence;

[0010] The heat dissipation portion is arranged on the outer surface of the magnetic core;

[0011] The heat dissipation copper sheet is wound around the central electrode portion as a starting point;

[0012] The magnetic core is filled inside the winding of the heat dissipation copper sheet;

[0013] The magnetic core is an integrally formed magnetic core.

[0014] The winding arrangement of the present invention is a hollow winding arrangement, that is, during the winding process, there is a hollow space between each layer of winding and the previous layer of winding, and the hollow space is filled with a magnetic core.

[0015] In the one-piece molded inductor of the present invention, there is no specific limit on the number of windings of the heat dissipation copper sheet, and the number of windings can be appropriately increased to improve the inductance. Since the heat dissipation part of the heat dissipation copper sheet of the present invention is integrated with the winding part, it can better dissipate heat for the inductor. The magnetic core of the present invention is an one-piece molded magnetic core, which can fully contact with the winding part of the heat dissipation copper sheet by virtue of its unique structure, so as to achieve the purpose of rapid heat transfer.

[0016] The magnetic core of the inductor of the present invention is an integrally formed magnetic core, which can not only save volume and achieve a small volume but also improve power density.

[0017] The special structure of the integrally formed inductor of the present invention can not only improve the dynamic response characteristics of the circuit, but also reduce the inductor current ripple.

[0018] Preferably, the one-piece molded inductor comprises a first heat dissipation copper sheet, a second heat dissipation copper sheet and a magnetic core, and the magnetic core comprises a first magnetic core portion, a second magnetic core portion and an insulating partition disposed between the first magnetic core portion and the second magnetic core portion.

[0019] Preferably, the first heat dissipation copper sheet and the second heat dissipation copper sheet are wound in opposite directions.

[0020] Preferably, the first magnetic core portion and the second magnetic core portion are respectively filled inside the windings of the first heat dissipation copper sheet and the second heat dissipation copper sheet to be insulated and connected.

[0021] The one-piece molded inductor of the present invention comprises two coiled heat dissipation copper sheets, which are symmetrically arranged. Since the windings are symmetrical about the central axis of the magnet, the directions of the magnetic fields generated are opposite. The two windings are coplanar for input and coplanar for output, and the currents on the windings have the effect of opposite directions, so the coupling coefficient is extremely low and approaches 0, which can improve the dynamic response and the dynamic efficiency of the whole machine.

[0022] Preferably, the heat dissipation copper sheet is wound around the central electrode portion.

[0023] Preferably, the central electrode portion extends out of a side surface of the magnetic core.

[0024] Preferably, the outer electrode portion is located at the bottom of the magnetic core.

[0025] The present invention can use the heat dissipation copper sheet at the bottom of the magnetic core as the external electrode part, or can connect a metal block to the heat dissipation copper sheet at the bottom of the magnetic core as the external electrode part.

[0026] Preferably, the winding portion is located inside the magnetic core.

[0027] Preferably, the material of the magnetic core includes any one of iron powder, iron-silicon alloy powder, sendust alloy magnetic powder, amorphous powder or iron-nickel alloy powder, or a combination of at least two thereof.

[0028] Preferably, the winding cross-sectional shape of the heat dissipation copper sheet independently includes an arc shape or a rectangle.

[0029] In a second aspect, the present invention provides a method for preparing the integrally formed inductor as described in the first aspect, the preparation method comprising the following steps:

[0030] The material of the magnetic core is subjected to molding treatment to obtain the magnetic core, and the heat dissipation copper sheets are respectively attached to the magnetic core, and the integrally formed inductor is obtained through pressing treatment and annealing treatment.

[0031] The method of the present invention can make the magnetic core and the winding fully contact, so as to achieve rapid heat transfer. The pressing and molding under high pressure makes the whole device have no gap inside, so as to achieve full space utilization, and at the same time increase the heat dissipation area, so as to achieve high power density.

[0032] Preferably, the pressure of the pressing treatment is 15t to 20t, for example, 15t, 16t, 17t, 18t, 19t or 20t, etc., and is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0033] Preferably, the annealing temperature is 700°C to 800°C, for example, 700°C, 720°C, 750°C, 780°C or 800°C, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0034] In a third aspect, the present invention provides an application of the one-piece molded inductor as described in the first aspect, wherein the one-piece molded inductor is used in a server.

[0035] The server of the present invention includes an artificial intelligence (AI) server.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) The one-piece molded inductor of the present invention has high density characteristics, and the magnetic core and the winding are tightly combined, which not only has good thermal conductivity and heat dissipation effects, so that it can maintain a low operating temperature, but also the heat dissipation copper sheet can dissipate heat for the inductor, which can improve the inductor's current carrying capacity.

[0038] (2) The present invention adopts reasonable structural design so that the heat sink copper sheet can not only dissipate heat for the inductor, but also improve the inductance of the inductor. The coupling coefficient of the inductor is extremely low. The lower the coupling coefficient is, the higher the coupling coefficient is in the dual reverse coupling application. In the reverse coupling application, the output ripple can be reduced and the dynamic response of the inductor can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of an integrated molded inductor provided in an embodiment of the present invention, wherein 1 is a first heat dissipation portion, 2 is a first winding portion, 3 is a first central electrode portion, 4 is a first magnetic core portion, 5 is a first outer electrode portion, 6 is an insulating partition, 7 is a second heat dissipation portion, 8 is a second winding portion, 9 is a second central electrode portion, 10 is a second magnetic core portion, and 11 is a second outer electrode portion.

[0040] Figure 2 4 is a schematic structural diagram of a magnetic core of an integrally formed inductor provided in an embodiment of the present invention, wherein 4 is a first magnetic core portion, 6 is an insulating partition, and 10 is a second magnetic core portion.

[0041] Figure 3 This is a crack diagram of the inductor obtained in Example 5 of the present invention. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0043] Example 1

[0044] This embodiment provides an integrally formed inductor, the structural schematic diagram of the integrally formed inductor is as shown in FIG. Figure 1 As shown, the one-piece molded inductor includes a first heat dissipation copper sheet, a second heat dissipation copper sheet and a magnetic core, and the magnetic core includes a first magnetic core portion 4, a second magnetic core portion 10 and an insulating partition 6;

[0045] The first heat dissipation copper sheet and the second heat dissipation copper sheet are symmetrically arranged with the insulating partition plate 6 as the center;

[0046] The first heat dissipation copper sheet comprises a first central electrode portion 3, a first winding portion 2, a first heat dissipation portion 1 and a first outer electrode portion 5 which are connected in sequence;

[0047] The second heat dissipation copper sheet comprises a second central electrode portion 9, a second winding portion 8, a second heat dissipation portion 7 and a second outer electrode portion 11 which are connected in sequence;

[0048] The first heat dissipation copper sheet is wound around the first central electrode portion 3 as a starting point, and the second heat dissipation copper sheet is wound around the second central electrode portion 9 as a starting point, and the winding directions of the first heat dissipation copper sheet and the second heat dissipation copper sheet are opposite;

[0049] The first magnetic core part 4, the insulating partition 6 and the second magnetic core part 10 are respectively filled inside the winding of the first heat dissipation copper sheet and the second heat dissipation copper sheet to be insulated and connected;

[0050] The magnetic core is an integrally formed magnetic core;

[0051] The first outer electrode portion 5 and the second outer electrode portion 11 are respectively located at the bottom of the magnetic core.

[0052] The one-piece molded inductor is manufactured by the following method:

[0053] The iron-silicon alloy powder is pressed into a one-piece molding Figure 2 The magnetic core shown includes a first magnetic core portion 4, an insulating partition 6 and a second magnetic core portion 10. Heat dissipation copper sheets are respectively attached to the magnetic cores, pressed under a pressure of 18t and then annealed at 750°C to obtain the one-piece molded inductor.

[0054] Example 2

[0055] This embodiment provides an integrally formed inductor, the structural schematic diagram of the integrally formed inductor is as shown in FIG. Figure 1 As shown, the one-piece molded inductor includes a first heat dissipation copper sheet, a second heat dissipation copper sheet and a magnetic core, and the magnetic core includes a first magnetic core portion 4, a second magnetic core portion 10 and an insulating partition 6;

[0056] The first heat dissipation copper sheet and the second heat dissipation copper sheet are symmetrically arranged with the insulating partition plate 6 as the center;

[0057] The first heat dissipation copper sheet comprises a first central electrode portion 3, a first winding portion 2, a first heat dissipation portion 1 and a first outer electrode portion 5 which are connected in sequence;

[0058] The second heat dissipation copper sheet comprises a second central electrode portion 9, a second winding portion 8, a second heat dissipation portion 7 and a second outer electrode portion 11 which are connected in sequence;

[0059] The first heat dissipation copper sheet is wound around the first central electrode portion 3 as a starting point, and the second heat dissipation copper sheet is wound around the second central electrode portion 9 as a starting point, and the winding directions of the first heat dissipation copper sheet and the second heat dissipation copper sheet are opposite;

[0060] The first magnetic core part 4, the insulating partition 6 and the second magnetic core part 10 are respectively filled inside the winding of the first heat dissipation copper sheet and the second heat dissipation copper sheet to be insulated and connected;

[0061] The magnetic core is an integrally formed magnetic core;

[0062] The first outer electrode portion 5 and the second outer electrode portion 11 are respectively located at the bottom of the magnetic core.

[0063] The one-piece molded inductor is manufactured by the following method:

[0064] The iron-silicon alloy powder is pressed into a one-piece molding Figure 2 The magnetic core shown includes a first magnetic core portion 4, an insulating partition 5 and a second magnetic core portion 9. Heat dissipation copper sheets are respectively attached to the magnetic cores, pressed under a pressure of 15t and then annealed at 700°C to obtain the one-piece molded inductor.

[0065] Example 3

[0066] This embodiment provides an integrally formed inductor, the structural schematic diagram of the integrally formed inductor is as shown in FIG. Figure 1 As shown, the one-piece molded inductor includes a first heat dissipation copper sheet, a second heat dissipation copper sheet and a magnetic core, and the magnetic core includes a first magnetic core portion 4, a second magnetic core portion 10 and an insulating partition 6;

[0067] The first heat dissipation copper sheet and the second heat dissipation copper sheet are symmetrically arranged with the insulating partition plate 6 as the center;

[0068] The first heat dissipation copper sheet comprises a first central electrode portion 3, a first winding portion 2, a first heat dissipation portion 1 and a first outer electrode portion 5 which are connected in sequence;

[0069] The second heat dissipation copper sheet comprises a second central electrode portion 9, a second winding portion 8, a second heat dissipation portion 7 and a second outer electrode portion 11 which are connected in sequence;

[0070] The first heat dissipation copper sheet is wound around the first central electrode portion 3 as a starting point, and the second heat dissipation copper sheet is wound around the second central electrode portion 9 as a starting point, and the winding directions of the first heat dissipation copper sheet and the second heat dissipation copper sheet are opposite;

[0071] The first magnetic core part 4, the insulating partition 6 and the second magnetic core part 10 are respectively filled inside the winding of the first heat dissipation copper sheet and the second heat dissipation copper sheet to be insulated and connected;

[0072] The magnetic core is an integrally formed magnetic core;

[0073] The first outer electrode portion 5 and the second outer electrode portion 11 are respectively located at the bottom of the magnetic core.

[0074] The one-piece molded inductor is manufactured by the following method:

[0075] The iron-silicon alloy powder is pressed into a one-piece molding Figure 2 The magnetic core shown includes a first magnetic core portion 4, an insulating partition 6 and a second magnetic core portion 10. Heat dissipation copper sheets are attached to the magnetic cores respectively, pressed under a pressure of 20t and then annealed at 800°C to obtain the one-piece molded inductor.

[0076] Example 4

[0077] This embodiment provides an integrally formed inductor, the structural schematic diagram of the integrally formed inductor is as shown in FIG. Figure 1 As shown, the one-piece molded inductor includes a first heat dissipation copper sheet, a second heat dissipation copper sheet and a magnetic core, and the magnetic core includes a first magnetic core portion 4, a second magnetic core portion 10 and an insulating partition 6;

[0078] The first heat dissipation copper sheet and the second heat dissipation copper sheet are symmetrically arranged with the insulating partition plate 6 as the center;

[0079] The first heat dissipation copper sheet comprises a first central electrode portion 3, a first winding portion 2, a first heat dissipation portion 1 and a first outer electrode portion 5 which are connected in sequence;

[0080] The second heat dissipation copper sheet comprises a second central electrode portion 9, a second winding portion 8, a second heat dissipation portion 7 and a second outer electrode portion 11 which are connected in sequence;

[0081] The first heat dissipation copper sheet is wound around the first central electrode portion 3 as a starting point, and the second heat dissipation copper sheet is wound around the second central electrode portion 9 as a starting point, and the winding directions of the first heat dissipation copper sheet and the second heat dissipation copper sheet are opposite;

[0082] The first magnetic core part 4, the insulating partition 6 and the second magnetic core part 10 are respectively filled inside the winding of the first heat dissipation copper sheet and the second heat dissipation copper sheet to be insulated and connected;

[0083] The magnetic core is an integrally formed magnetic core;

[0084] The first outer electrode portion 5 and the second outer electrode portion 11 are respectively located at the bottom of the magnetic core.

[0085] The one-piece molded inductor is manufactured by the following method:

[0086] The iron-silicon alloy powder is pressed into a one-piece molding Figure 2 The magnetic core shown includes a first magnetic core portion 4, an insulating partition 6 and a second magnetic core portion 10. Heat dissipation copper sheets are respectively attached to the magnetic cores, pressed under a pressure of 10t and then annealed at 750°C to obtain the one-piece molded inductor.

[0087] Example 5

[0088] This embodiment provides an integrally formed inductor, the structural schematic diagram of the integrally formed inductor is as shown in FIG. Figure 1 As shown, the one-piece molded inductor includes a first heat dissipation copper sheet, a second heat dissipation copper sheet and a magnetic core, and the magnetic core includes a first magnetic core portion 4, a second magnetic core portion 10 and an insulating partition 6;

[0089] The first heat dissipation copper sheet and the second heat dissipation copper sheet are symmetrically arranged with the insulating partition plate 6 as the center;

[0090] The first heat dissipation copper sheet comprises a first central electrode portion 3, a first winding portion 2, a first heat dissipation portion 1 and a first outer electrode portion 5 which are connected in sequence;

[0091] The second heat dissipation copper sheet comprises a second central electrode portion 9, a second winding portion 8, a second heat dissipation portion 7 and a second outer electrode portion 11 which are connected in sequence;

[0092] The first heat dissipation copper sheet is wound around the first central electrode portion 3 as a starting point, and the second heat dissipation copper sheet is wound around the second central electrode portion 9 as a starting point, and the winding directions of the first heat dissipation copper sheet and the second heat dissipation copper sheet are opposite;

[0093] The first magnetic core part 4, the insulating partition 6 and the second magnetic core part 10 are respectively filled inside the winding of the first heat dissipation copper sheet and the second heat dissipation copper sheet to be insulated and connected;

[0094] The magnetic core is an integrally formed magnetic core;

[0095] The first outer electrode portion 5 and the second outer electrode portion 11 are respectively located at the bottom of the magnetic core.

[0096] The one-piece molded inductor is manufactured by the following method:

[0097] The iron-silicon alloy powder is pressed into a one-piece molding Figure 2The magnetic core shown in FIG. 1 includes a first magnetic core portion 4, an insulating partition 6 and a second magnetic core portion 10. The heat dissipation copper sheets are respectively attached to the magnetic cores, and are pressed under a pressure of 25t and then annealed at 750°C to obtain the one-piece molded inductor. The cracks in the inductor are as shown in FIG. Figure 3 shown.

[0098] Cracks appeared in the manufactured inductor, extending from the copper end to the front of the product, and longitudinal cracks appeared. Comprehensive analysis showed that this crack was a hidden crack caused by excessive pressure, and the crack was magnified after annealing.

[0099] Comparative Example 1

[0100] The only difference between this comparative example and the first embodiment is that the first heat dissipation part 1 and the second heat dissipation part 7 are not provided, and other conditions and parameters are exactly the same as those of the first embodiment.

[0101] The dynamic test performance test results are shown in Table 1:

[0102] Table 1

[0103]

[0104] It can be seen from Table 1 that the use of the inductor of the present invention can meet the output voltage undershoot of ≤29.126mV, the output voltage overshoot of ≤88.124mV, and the efficiency can reach more than 86.888%.

[0105] By comparing Example 1 with Examples 4-5, it can be seen that during the preparation process of the one-piece molded inductor of the present invention, the pressure of the pressing treatment will affect its performance. When the pressure of the pressing treatment is controlled at 15t-20t, the performance of the one-piece molded inductor is better. If the pressure of the pressing treatment is too high, the inductor will crack. If the pressure of the pressing treatment is too low, the inductor will not be pressed into shape, and the output voltage undershoot and output voltage overshoot will increase.

[0106] By comparing Example 1 with Comparative Example 1, it can be seen that the output voltage undershoot and output voltage overshoot of the inductor described in the present invention meet the xPU industry indicators, and the dynamic characteristic indicators are good. If the heat dissipation part is not provided, the output voltage undershoot and output voltage overshoot will increase significantly, and the efficiency will be reduced.

[0107] Among them, in the embodiment of the present invention, the present invention can adjust the size and dimensions of the winding according to actual needs to meet various circuit requirements. The volume ratio of the winding to the magnetic core can be 1:5 to 1:6.

[0108] In the one-piece molded inductor described in the present invention, there is no specific limitation on the number of windings of the heat dissipation copper sheet, and the number of windings can be appropriately increased to improve the inductance. The size and dimensions of the winding can be arbitrarily adjusted according to actual needs to meet various circuit requirements. It has a wide range of uses and is more practical.

[0109] In an embodiment of the present invention, the first heat dissipation copper sheet and the second heat dissipation copper sheet may be symmetrically arranged with the insulating partition as the center.

[0110] The one-piece molded inductor of the present invention comprises two coiled heat dissipation copper sheets, which are symmetrically arranged. Since the windings are symmetrical about the central axis of the magnet, the directions of the generated magnetic fields are opposite.

[0111] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. An integrally formed inductor, characterized in that: The one-piece molded inductor includes at least one heat dissipation copper sheet and at least one magnetic core; The heat dissipation copper sheet comprises a central electrode portion, a winding portion, a heat dissipation portion and an outer electrode portion which are integrally connected in sequence; The heat dissipation portion is arranged on the outer surface of the magnetic core; The heat dissipation copper sheet is wound around the central electrode portion as a starting point; The magnetic core is filled inside the winding of the heat dissipation copper sheet; The magnetic core is an integrally formed magnetic core.

2. The one-piece molded inductor according to claim 1, characterized in that: The one-piece molded inductor comprises a first heat dissipation copper sheet, a second heat dissipation copper sheet and a magnetic core, wherein the magnetic core comprises a first magnetic core portion, a second magnetic core portion and an insulating partition disposed between the first magnetic core portion and the second magnetic core portion; Preferably, the first heat dissipation copper sheet and the second heat dissipation copper sheet are wound in opposite directions.

3. The one-piece molded inductor according to claim 2, characterized in that: The first magnetic core portion and the second magnetic core portion are respectively filled in the winding interior of the first heat dissipation copper sheet and the second heat dissipation copper sheet to be insulated and connected.

4. The one-piece molded inductor according to any one of claims 1 to 3, characterized in that: The central electrode portion extends out of a side surface of the magnetic core.

5. The one-piece molded inductor according to any one of claims 1 to 4, characterized in that: The winding portion is located inside the magnetic core.

6. The one-piece molded inductor according to any one of claims 1 to 5, characterized in that: The material of the magnetic core includes any one of iron powder, iron-silicon alloy powder, sendust alloy magnetic powder, amorphous powder or iron-nickel alloy powder, or a combination of at least two thereof.

7. The one-piece molded inductor according to any one of claims 1 to 6, characterized in that: The winding cross-sectional shape of the heat dissipation copper sheet independently includes an arc shape or a rectangle shape.

8. A method for preparing the integrally formed inductor according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: The material of the magnetic core is subjected to molding treatment to obtain the magnetic core, and the heat dissipation copper sheets are respectively attached to the magnetic core, and the integrally formed inductor is obtained through pressing treatment and annealing treatment.

9. The preparation method according to claim 8, characterized in that: The pressure of the pressing treatment is 15t to 20t; Preferably, the annealing treatment is performed at a temperature of 700°C to 800°C.

10. An application of the one-piece molded inductor according to any one of claims 1 to 7, characterized in that: The one-piece molded inductor is used in a server.

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