Copper-iron co-fired inductor with porous silicon carbide in copper tube electrode for improving heat dissipation

Abstract

A copper pipe electrode is provided with a porous silicon carbide for improving heat dissipation of a copper-iron co-fired inductor, which comprises an inductor body and an electrode body, the electrode body horizontally penetrating the inductor body; the electrode body comprises a copper electrode and a silicon carbide strip, the copper electrode comprises a fitting part and a folding part, the fitting part penetrating and fitting in the inside of the inductor body, and the fitting part is hollow with both ends open, the silicon carbide strip is fitted in the fitting part, and the folding part is integrally formed with the fitting part and is bent along the surface of the inductor body; the rated temperature rise current of the inductor can be higher than the saturation rated current, and the temperature rise current will not become the limit of the working current; the copper electrode is folded upward and downward, and the upward and downward symmetrical parts can be used as the mounting surface.

Description

Technical Field

[0001] This utility model relates to the field of inductors, and in particular to a copper-iron co-fired inductor with porous silicon carbide in the copper tube electrode to improve heat dissipation. Background Technology

[0002] Copper-iron co-fired inductors are widely used in power modules for AI chips that require long-term operation because their magnetic materials have high permeability and high saturation magnetization, and they are sintered at high temperatures in the range of 650-750℃, giving them high-temperature resistance.

[0003] However, as the components operate under high current for extended periods, they will continuously heat up. Excessive temperature will limit the inductor's operating current. Therefore, it is necessary to enhance the inductor's heat dissipation capacity through design to increase the inductor's operating temperature. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defect that excessively high temperature will limit the working current of the inductor in the existing technology, and to provide a copper-iron co-fired inductor with porous silicon carbide in the copper tube electrode to improve heat dissipation.

[0005] The technical solution adopted by this utility model to solve its technical problem is a copper-iron co-fired inductor with porous silicon carbide in the copper tube electrode to improve heat dissipation, including an inductor body and an electrode body. The electrode body extends horizontally through the inductor body. The electrode body includes a copper electrode and a silicon carbide strip. The copper electrode includes an interlocking part and a folded part. The interlocking part extends through and is interlocked inside the inductor body. The interlocking part is hollow inside with open ends. The silicon carbide strip is interlocked inside the interlocking part. The folded part is integrally formed with the interlocking part and bends along the surface of the inductor body.

[0006] Furthermore, the electrode body is perpendicular to the surface of the inductor body and extends through the geometric center of the inductor body.

[0007] Furthermore, the inductor body, the mating portion, and the silicon carbide strip are of the same length.

[0008] Furthermore, the silicon carbide strip is silicon carbide with a porous structure.

[0009] Furthermore, the folded portion has two symmetrical parts, which are located at both ends of the fitting portion.

[0010] Furthermore, the folded portion includes an upper folded end and a lower folded end. The upper folded end is connected to the upper edge of the fitting portion and folds towards the top surface of the inductor body. The lower folded end is connected to the lower edge of the fitting portion and folds towards the bottom surface of the inductor body.

[0011] Furthermore, the width of the inductor body is at least twice the width of the electrode body.

[0012] This utility model has the following beneficial technical effects: The rated temperature rise current of an inductor can be higher than the saturation rated current, and the temperature rise current will not be a limitation on the operating current; the copper electrodes are folded up and down, and both the top and bottom are symmetrical and can be used as mounting surfaces. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the electrode of an embodiment of a copper-iron co-fired inductor with porous silicon carbide in a copper tube electrode to enhance heat dissipation according to the present invention. Figure 2 This is a schematic diagram of the electrode of an embodiment of a copper-iron co-fired inductor with porous silicon carbide in a copper tube electrode to enhance heat dissipation according to the present invention. Figure 3 This is an inductor explosion diagram of an embodiment of the copper-iron co-fired inductor with porous silicon carbide in a copper tube electrode to improve heat dissipation according to this utility model. Figure 4 This is a schematic diagram of the inductor before bending, representing an embodiment of a copper-iron co-fired inductor with porous silicon carbide in a copper tube electrode to enhance heat dissipation according to this utility model. Figure 5 This is a schematic diagram of an embodiment of a copper-iron co-fired inductor with porous silicon carbide in a copper tube electrode to improve heat dissipation, according to the present invention.

[0014] Explanation of reference numerals in the attached figures: 1. Inductor body; 2. Electrode body; 21. Copper electrode; 211. Fitting part; 212. Folding part; 22. Silicon carbide strip. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0016] Reference Figure 5 This embodiment includes an inductor body 1 and an electrode body 2. The electrode body 2 is perpendicular to the left and right surfaces of the inductor body 1 and extends horizontally through the axis of the geometric center of the inductor body 1. The electrode body 2 includes a copper electrode 21 and a silicon carbide strip 22. The part of the copper electrode 21 located inside the inductor body 1 is a fitting part 211, while the part located outside the inductor body 1 is a folded part 212.

[0017] Specifically, the copper electrode 21 includes a fitting portion 211 and two symmetrical folded portions 212. The fitting portion 211 is hollow inside with openings at both ends and is rectangular in shape. The silicon carbide strip 22 is fitted inside the fitting portion 211, while the folded portions 212 are located at both ends of the fitting portion 211. In addition, the folded portion 212 includes an upper folded end and a lower folded end. The upper folded end is connected to the upper edge of the fitting portion 211 and folds towards the top surface of the inductor body 1. The lower folded end is connected to the lower edge of the fitting portion 211 and folds towards the bottom surface of the inductor body 1. At the same time, the width of the folded portion 212 is the same as the width of the fitting portion 211.

[0018] Furthermore, the inductor body 1, the mating portion 211, and the silicon carbide strip 22 have the same length, and all of them change with the length of the inductor body 1; that is, the lengths of the mating portion 211 and the silicon carbide strip 22 are always the same as the length of the inductor body 1. Moreover, the silicon carbide strip 22 is silicon carbide with a porous structure.

[0019] The manufacturing process of the inductor of this utility model is as follows: 1. Preparation of finished powder: Use iron-silicon-aluminum and iron-nickel atomized powders coated with silica or alumina as raw materials; mix the raw materials with 0.5~3wt% silicone resin and 8-15wt% acetone or anhydrous ethanol, stir into wet clay blocks, granulate through a 40~60 mesh sieve, and dry for later use. 2. Mix silicon carbide powder with a D50 of 1μm, 6.0-10.0 wt% low-melting-point (500-600℃) aluminoborosilicate glass powder, and 20-30 wt% paraffin powder of the mixed silicon carbide powder evenly. Press the mixture under a pressure of 5-20 MPa to form a silicon carbide strip 22 with a circular cross-section and a strip shape. Insert the strip into a copper tube electrode of a certain length. Figure 1 As shown; 3. Place the copper tube containing silicon carbide strip 22 into the mold cavity. The length of the mold cavity should be the same as the length of the copper tube, and the width should be the width of the designed electrode. Press the copper tube into a square copper tube of a specific width, such as... Figure 2 As shown; 4. Place the magnetic powder prepared in step 1 into the mold cavity, flatten it with a pressure of 1 MPa, insert the square copper tube electrode, and pour in magnetic powder again, as shown. Figure 3 Then it was flattened with a pressure of 1 MPa; 5. Press again. Before pressing, preheat the mold cavity at 110-130℃ for 60 seconds, press at 160-180℃ under a pressure of 600-1800MPa for 70-90 seconds, then demold. Figure 4 ; 6. Cut the copper electrode in half, remove the silicon carbide, and bend the cut copper electrode 21 in both upward and downward directions, as follows. Figure 5 As shown; 7. After forming, the green body is placed in an atmosphere furnace and sintered at 660-720℃ for 1-2 hours under nitrogen protection. After cooling, it is taken out. 8. Electroplat a layer of tin onto the copper electrode 21.

[0020] Furthermore, in step 6, when the folded portion 212 of the copper electrode 21 is cut open from the middle, the side of the folded portion 212 will unfold. However, after cutting, due to wear and direct removal, the width of the folded portion 212 and the width of the fitting portion 211 will be the same. The removed silicon carbide is the silicon carbide inside the folded portion 212, while the silicon carbide strip 22 inside the fitting portion 211 is still retained.

[0021] Example 1: External dimensions are 9×4×2.8mm. The inner electrode has a copper tube wall thickness of 0.35mm, a width of 2mm, and a length of 9mm. It has a porous silicon carbide core of 0.8mm thickness, with 1.6mm leads on each side of the top and bottom surfaces. The inductance is 120nH, the saturation current is 50A, the current at temperature rise (above room temperature 40℃) is 60A, and the RDC is 0.19mΩ. Comparative Example: External dimensions are 9×4×2.8mm. The inner electrode dimensions are 2×0.35×9mm, with a 1.6mm lead on the bottom surface. The inductance is 120nH, the saturation current is 50A, the current at temperature rise (above room temperature 40℃) is 42A, and the RDC is 0.33mΩ. With the same external dimensions, the inductor of this invention has a higher temperature rise current and a lower DC resistance RDC, and can be soldered in both directions. The above are preferred embodiments of this invention and are not intended to limit the scope of protection of this invention. Identical components are indicated 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 the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A copper-iron co-fired inductor with porous silicon carbide in the copper tube electrode for enhanced heat dissipation, characterized in that, The inductor body (1) and electrode body (2) are included. The electrode body (2) extends horizontally through the inductor body (1). The electrode body (2) includes a copper electrode (21) and a silicon carbide strip (22). The copper electrode (21) includes a fitting part (211) and a folding part (212). The fitting part (211) extends through and fits inside the inductor body (1). The fitting part (211) is hollow inside with open ends. The silicon carbide strip (22) is fitted inside the fitting part (211). The folding part (212) is integrally formed with the fitting part (211) and bends along the surface of the inductor body (1).

2. The copper-iron co-fired inductor with porous silicon carbide in the copper tube electrode according to claim 1, characterized in that, The electrode body (2) is perpendicular to the surface of the inductor body (1) and runs through the geometric center of the inductor body (1).

3. The copper-iron co-fired inductor with porous silicon carbide in the copper tube electrode to enhance heat dissipation according to claim 1, characterized in that, The inductor body (1), the fitting part (211), and the silicon carbide strip (22) are of the same length.

4. The copper-iron co-fired inductor with porous silicon carbide in the copper tube electrode to enhance heat dissipation according to claim 1, characterized in that, The silicon carbide strip (22) is silicon carbide with a porous structure.

5. The copper-iron co-fired inductor with porous silicon carbide in the copper tube electrode to enhance heat dissipation according to claim 1, characterized in that, The folded portion (212) has two symmetrical parts, which are located at both ends of the fitting portion (211).

6. The copper-iron co-fired inductor with porous silicon carbide in the copper tube electrode to enhance heat dissipation according to claim 1, characterized in that, The folding portion (212) includes an upper folding end and a lower folding end. The upper folding end is connected to the upper edge of the fitting portion (211) and folds towards the top surface of the inductor body (1). The lower folding end is connected to the lower edge of the fitting portion (211) and folds towards the bottom surface of the inductor body (1).

7. The copper-iron co-fired inductor with porous silicon carbide in the copper tube electrode to enhance heat dissipation according to claim 1, characterized in that, The width of the inductor body (1) is at least twice the width of the electrode body (2).

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