Multi-turn double-spliced copper-iron co-fired inductor and manufacturing method thereof

Abstract

A multi-turn, double-layered copper-iron co-fired inductor and its manufacturing method are disclosed. The co-fired inductor includes an electrode coil, an inductor body, and a connecting magnetic core. The electrode coil is partially disposed inside the inductor body and partially protrudes from the inductor body. The electrode coil is wound into a rectangle and has two end electrodes extending outwards. The end electrodes protrude from the inductor body and are located on the outside. The inductor body includes a separating magnetic core and a receiving magnetic core. The electrode coil is located inside the receiving magnetic core. The bottom of the separating magnetic core has multiple parallel and evenly distributed protrusions. The bottom of the receiving magnetic core has a groove that fits into the protrusions. The end electrodes of the electrode coil are bent and attached to the side of the receiving magnetic core and the top of the separating magnetic core. The electrode coil and the inductor body form a main inductor. The connecting magnetic core is disposed between two main inductors and formed into a co-fired inductor by sintering. This invention adopts a multi-turn, double-layered copper-iron co-fired design, which can increase the inductance to nearly 1 μH.

Description

Technical Field

[0001] This invention relates to the field of inductors, and more particularly to a multi-turn double-copper-iron co-fired inductor and its manufacturing method. Background Technology

[0002] Copper-iron co-fired inductors are widely used in the power supply circuits of AI computing chips because of their high saturation magnetic induction intensity, high permeability, and low power consumption. Since copper-iron co-fired inductors need to be sintered at around 700℃, the insulating varnish cannot withstand such a high temperature. Therefore, copper-iron co-fired inductors usually use bare copper electrodes and are single-turn designs. If the common multi-turn design is used, the wires will short-circuit.

[0003] Co-fired copper-iron inductors can only be designed with a single turn, so their inductance is generally below 300nH, making them unsuitable for applications requiring higher inductance. Furthermore, co-fired copper-iron inductors typically require two molding processes. The coil must be assembled onto the first-molded core, which needs to have sufficient strength. This assembly process can cause core damage, resulting in a high defect rate and a significant number of scrapped semi-finished products. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the existing copper-iron co-fired inductor, which has a low single-turn design inductance value and is prone to defect rate due to two-stage molding. The present invention provides a multi-turn double-layer copper-iron co-fired inductor and its manufacturing method.

[0005] The technical solution adopted by this invention to solve its technical problem is a multi-turn double-copper-iron co-fired inductor and its manufacturing method, including an electrode coil, an inductor body and a connecting magnetic core. The electrode coil is partially disposed inside the inductor body and partially protrudes from the inductor body. The electrode coil is wound into a rectangle and leads out two end electrodes. The end electrodes protrude from the inductor body and are located on the outside. The inductor body includes a distributing magnetic core and a receiving magnetic core. The electrode coil is located inside the receiving magnetic core. The bottom of the distributing magnetic core is provided with multiple parallel and evenly distributed protrusions. The bottom of the receiving magnetic core has a groove that fits into the protrusions. The end electrodes of the electrode coil are bent and attached to the side of the receiving magnetic core and the top of the distributing magnetic core. The electrode coil and the inductor body form a main inductor, and the connecting magnetic core is placed between the two main inductors and formed into a co-fired inductor by sintering.

[0006] Furthermore, the electrode coil includes multiple straight segments, multiple arc segments, two misaligned segments, and two end electrodes. The two ends of the straight segments are connected to the arc segments. One end of the arc segments is connected to the straight segments, and the other end is connected to either the straight segments or the misaligned segments. The end of the misaligned segments away from the arc segments is connected to the end electrodes. The projection of the arc segments is a curved line segment, so that the straight segments, arc segments, and misaligned segments are wound into a rectangle.

[0007] Furthermore, the bending angle of the arc segment is 90°, and the two ends of the arc segment are staggered so that the staggered segments no longer intersect. At the same time, the staggered segments are parallel to each other, and the two end electrodes are oriented in opposite directions.

[0008] Furthermore, the electrode coil is a one-piece molded circular copper wire, and the end electrode is flattened into an elongated shape.

[0009] Furthermore, the differentiated magnetic core has three protruding ridges. In the projection method, the middle protruding ridge is positioned between two misaligned segments, which are located between the two protruding ridges.

[0010] Furthermore, the size of the connecting magnetic core is smaller than the size of the electrode coil wound into a rectangle, and the thickness is 1.5mm.

[0011] The present invention further solves the technical problem by providing a manufacturing method based on the above-mentioned multi-turn double-copper-iron co-fired inductor, comprising the following steps: S1. Preparation of finished powder: Iron-silicon-aluminum and iron-nickel atomized powders coated with silica or alumina are used as raw materials. The raw materials are mixed with 0.5-3wt% silicone resin and 8-15wt% acetone or anhydrous ethanol to form wet clay blocks, which are then granulated through a 40-60 mesh sieve and dried for later use. S2. Select copper wire with a diameter greater than 0.5mm and a circular cross-section, wind it into a square shape, make two end electrodes parallel to each other and staggered, and flatten the end electrodes at the same time. S3. Place the electrode coil into the mold cavity and cover it with the upper mold cover; S4. Use the powder from step S1 to press it into a fractionated magnetic core using a cold pressing process. S5. Pour powder into the mold cavity, vibrate to compact, and cover with the disintegrating magnetic core. After cold pressing and holding at 600-900MPa for 3 seconds, demold. S6. Bend the protruding end electrode upwards; S7. Use the powder from step S1 to press it into a connecting magnetic core using a cold pressing process; S8. Clamp the connecting magnetic core between the two main inductors, and then press it with a press plate to make the two main inductors and the connecting magnetic core combine and form. S9. Apply an insulating layer to the entire surface of the blank using a roller spraying process; then, use a laser to ablate a rectangular area at the bottom end and electroplate a tin layer.

[0012] Furthermore, in step S5, when the differentiation core is covered, the two end electrodes are just separated by the three protruding ridges of the differentiation core. During pressing, the presence of the three protruding ridges (211) can change the pressure distribution in the powder, effectively preventing the two misaligned lines from being squeezed together by pressure.

[0013] Furthermore, in steps S4 and S7, the cold pressing process is carried out under a pressure of 200-300 MPa and requires holding the pressure for 3 seconds.

[0014] Furthermore, in step S8, the two main inductors and the connecting magnetic core are placed in an airtight space, protected by nitrogen, and the pressure is controlled at 200-300MPa. A resistance wire in the plate heats the plate to 480-500℃ at 3℃ / minute and holds it at this temperature for 40-60 minutes. Then, after cooling, the pressure is removed. Under the combined action of pressure and temperature, the two main inductors and the connecting magnetic core are completely combined.

[0015] The present invention has the following beneficial technical effects: 1. By adopting a design that uses two main inductors and connecting magnetic cores to form a co-fired inductor, both main inductors have electrode coils. After being connected by the connecting magnetic core, they form a multi-turn double-layer design, which allows the inductance to be increased compared to a single-turn inductor. The inductance is increased by about 3 to 4 times compared to a single-turn inductor, that is, the inductance can be increased to close to 1μH. At the same time, it also has the characteristics of a compact space layout. 2. By adopting the preparation method of the present invention, the electrode coil is directly formed together with the magnetic core in the mold cavity, eliminating the electrode assembly step and avoiding the possibility of magnetic core breakage during the assembly process, thus avoiding a step that generates a defect rate. In the process of preparing the magnetic core, the presence of protrusions on the magnetic core can change the pressure distribution in the powder, effectively preventing the two misaligned segments from being squeezed together by pressure, and also reducing the defect rate. The position of the connecting magnetic core corresponds to the area surrounded by the electrode coil, squeezing the hard-to-press core area surrounded by the electrode coil into a dense state, realizing a tight combination of the two main inductors and the connecting magnetic core, ensuring the compactness of the entire inductor. 3. At the same time, the high-pressure hot pressing is not in the mold cavity, which improves production efficiency. For both the split magnetic core and the housing magnetic core, they are formed by cold pressing during preparation. Accordingly, under the same press size, the press time is also shorter, and more magnetic cores can be formed in the same amount of time. The main inductor formed thereafter is placed under the press plate. Since there is no mold cavity to occupy space, more main inductors can be placed. Then, hot pressing can be performed to press more co-fired inductors at once. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the electrode coil winding of an embodiment of the multi-turn double-copper-iron co-fired inductor and its manufacturing method according to the present invention; Figure 2 This is a schematic diagram of the electrode coil structure of an embodiment of the multi-turn double-copper-iron co-fired inductor and its manufacturing method according to the present invention; Figure 3 This is a side view of the electrode coil of an embodiment of the multi-turn double-copper-iron co-fired inductor and its manufacturing method according to the present invention; Figure 4 This is a schematic diagram of the mold cavity of an embodiment of the multi-turn double-copper-iron co-fired inductor and its manufacturing method according to the present invention; Figure 5 This is a schematic diagram of the mold cavity and upper mold cover of an embodiment of the multi-turn double-copper-iron co-fired inductor and its manufacturing method according to the present invention; Figure 6 This is a schematic diagram of the structure of the differentiated magnetic core and the housing magnetic core in an embodiment of the multi-turn double-copper-iron co-fired inductor and its manufacturing method according to the present invention; Figure 7 This is a schematic diagram of the forming of the differentiated magnetic core and the housing magnetic core in an embodiment of the multi-turn double-copper-iron co-fired inductor and its manufacturing method according to the present invention; Figure 8 This is a schematic diagram of the main inductor structure of an embodiment of the multi-turn double-copper-iron co-fired inductor and its manufacturing method according to the present invention; Figure 9 This is a schematic diagram of the main inductor and connecting magnetic core structure of an embodiment of the multi-turn double-copper-iron co-fired inductor and its manufacturing method according to the present invention; Figure 10 This is a schematic diagram of the main inductor and connecting magnetic core being pressed by a press in an embodiment of the multi-turn double-copper-iron co-fired inductor and its manufacturing method of the present invention; Figure 11 This is a schematic diagram of the co-fired inductor blank according to an embodiment of the present invention, which describes a multi-turn double-copper-iron co-fired inductor and its manufacturing method. Figure 12 This is a schematic diagram of the insulating layer plated on the co-fired inductor, which is an embodiment of the multi-turn double-copper-iron co-fired inductor and its manufacturing method according to the present invention. Figure 13 This is a schematic diagram of the co-fired inductor structure according to an embodiment of the present invention, which describes a multi-turn double-copper-iron co-fired inductor and its manufacturing method.

[0017] Explanation of reference numerals in the attached figures: 1. Electrode coil; 11. Straight segment; 12. Arc segment; 13. Misaligned segment; 14. End electrode; 2. Inductor body; 21. Differentiated magnetic core; 211. Protruding ridge; 22. Receiver core; 3. Connecting magnetic core; 4. Main inductor; 5. Mold cavity; 6. Upper mold cover. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] Reference Figure 8 and Figure 10In this embodiment, the multi-turn double-copper-iron co-fired inductor consists of two main inductors 4 and a connecting magnetic core 3. The connecting magnetic core 3 is pressed down by a flat plate, which simultaneously bonds the two main inductors 4, thereby forming a double-copper co-fired inductor. The main inductor 4 includes an electrode coil 1 and an inductor body 2. The electrode coil 1 is embedded in the inductor body 2, with a portion protruding from the inductor body 2.

[0020] Reference Figure 2 The electrode coil 1 includes multiple straight segments 11, multiple arc segments 12, two misaligned segments 13, and two end electrodes 14. The axes of the straight segments 11 are perpendicular to each other, and both ends of all the straight segments 11 are connected to the arc segments 12. Among the arc segments 12, two arc segments 12 are connected to both ends of the straight segments 11, and the remaining arc segments 12 are connected to the straight segments 11 at one end and to the misaligned segments 13 at the other end. The misaligned segments 13 are connected to the arc segments 12 at one end and to the end electrodes 14 at the other end. The end electrodes 14 are the parts of the electrode coil 1 that protrude from the inductor body 2 and are located on the outside. It should be noted that the misaligned segment 13 is actually another form of the straight segment 11. Both are straight lines, but they differ in length, function, etc. The arc segment 12, viewed from the front, is an arc with a 90° curvature. However, viewed from the side, the center points of the two ends of the arc are not located on the same vertical plane; that is, the two ends are misaligned left and right. Therefore, under the influence of the 90° arc segment 12, the electrode coil 1 will be wound into a square shape when viewed from the front. However, when viewed from the side, the straight segments 11 on the left and right sides will be misaligned rather than overlapping. That is, the two straight segments 11 will be located on the left and right sides of the vertical plane between them. Therefore, the straight segments 11 on the left and right sides, connected to the misaligned segment 13 via the arc segment 12, will make the two misaligned segments 13 parallel and non-intersecting when viewed from above. Ultimately, this also makes the end electrodes 14 parallel and non-intersecting. In fact, the entire electrode coil 1 is wound on a cube with rounded corners, and the coil is misaligned during the winding process. In this embodiment, three straight segments 11 and three curved segments 12 are provided, and the distance between two misaligned segments 13 is close to the diameter of the copper wire.

[0021] It should also be noted that the electrode coil 1 uses copper wire with a diameter greater than 0.5 mm and a circular cross-section, which is easier to bend and shape during the winding process; the end electrode 14 protruding from the inductor body 2 will be flattened into a long strip, and since the two misaligned segments 13 face opposite directions, the two end electrodes 14 are located on the left and right sides of the inductor body 2.

[0022] Reference Figure 8The inductor body 2 is rectangular, specifically comprising a splitting magnetic core 21 and a receiving magnetic core 22. The splitting magnetic core 21 and the receiving magnetic core 22 are made of the same material, differing only in structure. The electrode coil 1 is disposed within the receiving magnetic core 22, and the splitting magnetic core 21 is disposed on top of the receiving magnetic core 22. The bottom surface of the splitting magnetic core 21 has three protruding ridges 211, with the middle ridge 211 positioned precisely between two misaligned segments 13 in a projection method. Simultaneously, the misaligned segments 13 are located between the middle ridge 211 and either the right or left ridge 211. This design prevents the misaligned segments 13 from converging due to pressure when the electrode coil 1 is compressed, thanks to the presence of the ridges 211. Correspondingly, to fit the splitting magnetic core 21, the top surface of the receiving magnetic core 22 has grooves corresponding to the receiving ridges 211. Furthermore, the end electrode 14 of the electrode coil 1 is bent and attached to the side of the receiving magnetic core 22 and the top of the splitting magnetic core 21.

[0023] In this embodiment, the differentiating magnetic core 21 and the receiving magnetic core 22 are manufactured separately. The differentiating magnetic core 21 is manufactured before the receiving magnetic core 22. Specifically, the electrode coil 1 is placed in the mold cavity 5 and fixed and restricted by the upper mold cover 6. The molding material is poured into the mold cavity 5 and covered by the differentiating magnetic core 21. In this way, the molded receiving material not only wraps the electrode coil 1 but also fits perfectly with the differentiating magnetic core 21.

[0024] It should be noted that the position where the connecting magnetic core 3 is attached to the main inductor 4 is the position directly opposite the rectangle formed by the electrode coil 1. That is, the side of the main inductor 4 to which the connecting magnetic core 3 is attached must be the side directly opposite the rectangle formed on the electrode coil 1.

[0025] An embodiment of the present invention discloses a multi-turn double-copper-iron co-fired inductor and its manufacturing method, comprising the following steps: S1. Preparation of finished powder: Iron-silicon-aluminum and iron-nickel atomized powders coated with silica or alumina are used as raw materials. The raw materials are mixed with 0.5-3wt% silicone resin and 8-15wt% acetone or anhydrous ethanol to form wet clay blocks, which are then granulated through a 40-60 mesh sieve and dried for later use. S2. Select copper wire with a diameter greater than 0.5mm and a circular cross-section. Wrap the copper wire around a cube with rounded corners to form a square shape. The two end electrodes 14 are parallel to each other and staggered. Figure 1 As shown; S3. Flatten the terminal electrode 14, as follows: Figure 2 As shown; S4. Place the electrode coil 1 into the mold cavity 5 and cover it with the upper mold cover 6. In addition to accommodating the electrical coil, the mold cavity 5 also has a slot for holding the upper electrode 14 of the electrode coil 1 in place. After the upper mold cover 6 is closed, it will press down on the end electrode 14. Figure 4 , Figure 5 As shown; S5. Using the powder from step S1, press the powder in the mold of the differentiated magnetic core 21 using a cold pressing process at a pressure of 200-300MPa for 3 seconds to form the differentiated magnetic core 21. Figure 6 As shown in the green section; S6. Powder is poured into the mold cavity 5 and compacted by vibration. The cavity is then covered by the separating magnetic core 21. After cold pressing and holding at 600-900 MPa for 3 seconds, the mold is removed. With the separating magnetic core 21 covering the cavity, the two end electrodes 14 are separated by the three protruding ridges 211 of the separating magnetic core 21. During pressing, the presence of the three protruding ridges 211 changes the pressure distribution in the powder, effectively preventing the two misaligned segments 13 from being squeezed together by pressure. Figure 7 As shown; S7. Remove the molded housing core 22 from the film, and bend the protruding end electrodes 14 at both ends of the housing core 22 upwards to form the main inductor 4, as shown. Figure 8 As shown; S8. Using the powder from step S1, a cold pressing process is employed, pressing it under a pressure of 200-300 MPa for 3 seconds to form the connecting magnetic core 3. The area of ​​the connecting magnetic core 3 is slightly smaller than the area enclosed by the electrode coil 1, and its thickness is 1.5 mm. Figure 9 The green part attached to the middle of the main inductor 4 on the right side is shown; S9. Clamp the connecting magnetic core 3 between the two main inductors 4, then press it down with a press plate and place it in an airtight space, such as... Figure 10 As shown; under nitrogen protection, the pressure is controlled at 200-300MPa. A resistance wire in the plate heats the material to 480-500℃ at a rate of 3℃ / minute and holds it at this temperature for 40-60 minutes. After cooling, the pressure is removed. Under the combined effect of pressure and temperature, the two main inductors 4 and the connecting magnetic core 3 are completely bonded together, as shown. Figure 11 As shown; S10. Apply an insulating layer to the entire surface of the blank using a roller spraying process, such as... Figure 11 As shown; then, in the bottom end area, a rectangular area is laser-etched and a layer of tin is electroplated to form a co-fired inductor, as shown. Figure 13 As shown.

[0026] In step S2, copper wire is used to facilitate shaping during winding. In step S3, the end electrode 14 is flattened into a long strip to facilitate bending in subsequent steps. Bending the end electrode 14 simultaneously aligns it with the receiving core 22 and the separating core 21, and the bent portion fixes the separating core 21 to the top of the receiving core 22. In step S4, the mold cavity 5 and the upper mold cover 6 are both pre-made molds. In step S6, the presence of the protruding ridge 211 on the separating core 21 effectively prevents the two misaligned segments 13 from being squeezed together by pressure, reducing the defect rate. In step S8, the connecting... The presence of the magnetic core 3 connects the two main inductors 4, and the two main inductors 4 are bonded together by pressing them with a press plate. At the same time, the magnetic core 3 compresses the hard-to-press hollow area surrounding the electrode coil 1, and finally, the two main inductors 4 are combined into one by sintering. In step S9, since the press plate is pressing the main inductors without a mold cavity, there is no large mold cavity, which allows hundreds or thousands of sandwich-like double inductors to be pressed at once. During this process, the magnetic core, under the compression, compresses the originally loose part surrounding the electrode coil 1, which also ensures the compactness of the main inductors.

[0027] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component. Therefore, all equivalent changes made to the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A multi-turn, double-layered copper-iron co-fired inductor, characterized in that, The inductor includes an electrode coil (1), an inductor body (2), and a connecting magnetic core (3). The electrode coil (1) is partially located inside the inductor body (2) and partially protrudes from it. The electrode coil (1) is wound into a rectangle and has two end electrodes (14) extending outwards. The end electrodes (14) protrude from the inductor body (2) and are located externally. The inductor body (2) includes a separating magnetic core (21) and a receiving magnetic core (22). The electrode coil (1) is located inside the receiving magnetic core (22). The bottom of the differentiated magnetic core (21) is provided with a plurality of parallel and evenly distributed protrusions (211), and the bottom of the receiving magnetic core (22) has a groove that fits into the protrusions (211). The end electrode (14) of the electrode coil (1) is bent and attached to the side of the receiving magnetic core (22) and the top of the differentiated magnetic core (21). The electrode coil (1) and the inductor body (2) form a main inductor (4), and the connecting magnetic core (3) is disposed between the two main inductors (4) and forms a co-fired inductor by sintering.

2. The multi-turn double-copper-iron co-fired inductor according to claim 1, characterized in that, The electrode coil (1) includes multiple straight segments (11), multiple arc segments (12), two misaligned segments (13), and two end electrodes (14). The two ends of the straight segments (11) are connected to the arc segments (12). One end of the arc segments (12) is connected to the straight segments (11), and the other end is connected to either the straight segments (11) or the misaligned segments (13). The end of the misaligned segments (13) away from the arc segments (12) is connected to the end electrodes (14). The projection of the arc segments (12) is a curved line segment, so that the straight segments (11), arc segments (12), and misaligned segments (13) are wound into a rectangle.

3. The multi-turn double-copper-iron co-fired inductor according to claim 2, characterized in that, The bending angle of the arc segment (12) is 90°, and the two ends of the arc segment (12) are staggered so that the staggered segments (13) no longer intersect. At the same time, the staggered segments (13) are parallel to each other, and the two end electrodes (14) are oriented in opposite directions.

4. The multi-turn double-copper-iron co-fired inductor according to claim 2, characterized in that, The electrode coil (1) is a one-piece formed circular copper wire, and the end electrode (14) is flattened into a long strip shape.

5. A multi-turn double-copper-iron co-fired inductor according to claim 2, characterized in that, The differentiated magnetic core (21) has three protruding ridges (211). In the projection method, the middle protruding ridge (211) is located between two misaligned segments (13), which are located between the two protruding ridges (211).

6. The multi-turn double-copper-iron co-fired inductor according to claim 1, characterized in that, The size of the connecting magnetic core (3) is smaller than the size of the electrode coil (1) wound into a rectangle, and the thickness is 1.5mm.

7. A method for manufacturing a multi-turn double-copper-iron co-fired inductor according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Preparation of finished powder: Iron-silicon-aluminum and iron-nickel atomized powders coated with silica or alumina are used as raw materials. The raw materials are mixed with 0.5-3wt% silicone resin and 8-15wt% acetone or anhydrous ethanol to form wet clay blocks, which are then granulated through a 40-60 mesh sieve and dried for later use. S2. Select copper wire with a diameter greater than 0.5 mm and a circular cross-section, wind it into a square shape, and make the two end electrodes (14) parallel to each other and staggered, while flattening the end electrodes (14). S3. Place the electrode coil (1) into the mold cavity (5) and cover it with the upper mold cover (6); S4. Use the powder from step S1 to press it into a fractionated magnetic core using a cold pressing process (21); S5. Powder is poured into the mold cavity (5) and compacted. It is then covered by the split magnetic core (21). After cold pressing and holding for 3 seconds at 600-900MPa, the mold is demolded. S6. Bend the protruding end electrode (14) upwards; S7. The powder from step S1 is pressed into a connecting magnetic core using a cold pressing process (3); S8. The connecting magnetic core (3) is sandwiched between the two main inductors (4), and then pressed with a press plate to make the two main inductors (4) and the connecting magnetic core (3) combine and form. S9. Apply an insulating layer to the entire surface of the blank using a roller spraying process; then, use a laser to ablate a rectangular area at the bottom end and electroplate a tin layer.

8. The method for manufacturing a multi-turn double-copper-iron co-fired inductor according to claim 7, characterized in that, In step S5, when the splitting core (21) is covered, the two end electrodes (14) are just separated by the three protrusions (211) of the splitting core (21). During pressing, the presence of the three protrusions (211) can change the pressure distribution in the powder and effectively prevent the two misaligned lines from being squeezed together by the pressure.

9. The method for manufacturing a multi-turn double-copper-iron co-fired inductor according to claim 7, characterized in that, In steps S4 and S7, the cold pressing process is carried out at a pressure of 200-300 MPa and requires holding the pressure for 3 seconds.

10. The method for manufacturing a multi-turn double-copper-iron co-fired inductor according to claim 7, characterized in that, In step S8, the two main inductors (4) and the connecting magnetic core (3) are placed in an airtight space, protected by nitrogen, and the pressure is controlled at 200-300MPa. The plate contains a resistance wire that heats the plate to 480-500℃ at 3℃ / minute and holds it at this temperature for 40-60 minutes. Then, the pressure is removed after cooling. The two main inductors (4) and the connecting magnetic core (3) are completely combined under the combined action of pressure and temperature.

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