TW202221734A - Inductor - Google Patents

Abstract

An inductor is disclosed. The inductor comprises at least one first magnetic core, a second magnetic core and at least one winding assembly. The at least one first magnetic core comprises a connecting part, a first pillar and a second pillar, wherein the first pillar and the second pillar are disposed on a top surface of the connecting part, and a winding groove is included between the first pillar and the second pillar. The second magnetic core is adjacent to the first magnetic core. Each winding assembly is composed of a single metal conductive sheet wound at least one turn, and each winding is wound on the corresponding first pillar and partly located in the winding groove of the corresponding first magnetic core. The thickness of the winding assembly is less than or equal to the width of the winding groove and greater than 0.9 times the width of the winding groove.

Description

inductance

This case is an inductor, especially an inductor that can be miniaturized, and can improve efficiency and heat dissipation.

In electronic products, various magnetic components, such as transformers and inductance components, are often used to satisfy the required circuit design through the principle of electromagnetic induction. However, for example, the windings of traditional inductors are usually composed of multiple sets of coils in parallel, and each set of coils has a coating layer, which results in a larger volume of the windings of traditional inductors and requires larger windings. Therefore, the volume of the traditional inductor is relatively large, which is not conducive to miniaturization, and each coil of the winding of the traditional inductor has a coating layer, which increases the copper loss of the winding and reduces the efficiency of the traditional inductor.

Therefore, it is necessary to develop an inductor to solve the problems faced by the prior art.

The main purpose of this application is to provide an inductor that can be miniaturized and can improve efficiency.

Another object of the present application is to provide an inductor which can improve heat dissipation.

In order to achieve the above purpose, the present application provides an inductor, comprising: at least one first magnetic core, including a connecting part, a first cylinder and a second cylinder, wherein the first cylinder and the second cylinder are arranged on the top surface of the connecting part The upper part is adjacent to two opposite outer sides of the top surface respectively, and a winding slot is included between the first cylinder and the second cylinder; the second magnetic core is arranged adjacent to the first magnetic core; and at least one winding , each winding is composed of a single metal conductive sheet wound at least one turn, and each winding is sleeved on the corresponding first cylinder and partially located in the winding slot of the corresponding first magnetic core, and the thickness of the winding is Less than or equal to the width of the winding slot, and greater than 0.9 times the width of the winding slot.

In order to achieve the above purpose, the present application further provides an inductor, comprising: three first magnetic cores, one of the three first magnetic cores is located between the other two first magnetic cores, and each first magnetic core The core includes a connection part, a first cylinder and a second cylinder, wherein the first cylinder and the second cylinder are arranged on the top surface of the connection part, and a winding slot is included between the first cylinder and the second cylinder and at least one winding, each winding is formed by winding a single metal conductive sheet for at least one turn, and each winding is sleeved on the first cylinder of the corresponding first magnetic core, and is partially located in the corresponding first magnetic core In the winding slot of the core, the overall thickness of the winding located in the winding slot is less than or equal to the width of the winding slot, and is greater than 0.9 times the width of the winding slot; among which the first core is located between the two first magnetic cores. The first column system of a magnetic core is adjacent to the first column body of one of the two first magnetic cores located on the outer side, and the connecting part of the first magnetic core is located between the two first magnetic cores It is adjacent to the first column of the other one of the two first magnetic cores located on the outer side.

Some typical embodiments embodying the features and advantages of the present case will be described in detail in the description of the latter paragraph. It should be understood that this case can have various changes in different aspects, all of which do not depart from the scope of this case, and the descriptions and drawings therein are essentially used for illustration rather than limiting the present case. Furthermore, numerical ranges or parameters inherently contain errors found in the respective tests or measurements, and, as used herein, the terms "about" or "substantially" generally mean 10%, Within 5%, 1% or 0.5%. Alternatively, the terms "about" or "substantially" mean within an error acceptable to one of ordinary skill in the art.

Please refer to Figure 1, Figure 2 and Figure 3, wherein Figure 1 is a schematic diagram of the combined structure of the inductor according to the first preferred embodiment of the present application, Figure 2 is a schematic diagram of the exploded structure of the inductor shown in Figure 1, Figure 3 is a schematic diagram of the structure of the winding of the inductor shown in Figure 1 when it is not wound. As shown in FIGS. 1 to 3 , the inductor 1 of this embodiment can constitute a single inductor and includes a first magnetic core 2 , a second magnetic core 3 and a winding 4 .

The first magnetic core 2 includes a connecting portion 20 , a first cylinder 21 and a second cylinder 22 , wherein the first cylinder 21 and the second cylinder 22 are disposed on the top surface 200 of the connecting portion 20 and are respectively connected to the top surface 200 . The two opposite outer sides are adjacent to each other, wherein the first column body 21 and the second column body 22 and the connecting portion 20 can be formed in one piece, but not limited to. In addition, a winding slot 23 is further included between the first column 21 and the second column 22 .

The second magnetic core 3 is disposed adjacent to the first magnetic core 2 and covers part of the structure of the first magnetic core 2 , for example, at least covering the top surface 210 of the first cylinder 21 and the top surface 220 of the second cylinder 22 . In some embodiments, the second magnetic core 3 is preferably an I-shaped magnetic core, but not limited thereto.

The winding 4 is composed of a single metal conductive sheet 40 (as shown in FIG. 3 ), such as a copper sheet, which is wound for at least one turn, and the winding 4 is directly sleeved on the first coil without using a bobbin. On a cylinder 21, and part of the winding 4 is located in the winding slot 23, and other parts of the winding 4 are exposed to the first magnetic core 2 and the second magnetic core 3, wherein the winding 4 located in the winding slot 23 The overall thickness T1 is substantially smaller than or equal to the width W1 of the wire winding groove 23 , and substantially greater than 0.9 times the width W1 of the wire winding groove 23 . In some embodiments, the winding 4 may further include a first end portion 400 and a second end portion 401 opposite to each other.

As can be seen from the above, compared with the traditional inductor composed of multiple sets of coils in parallel, and each set of coils has a coating layer, since the winding 4 of the inductor 1 of this embodiment is wound by a single metal conductive sheet, so The winding 4 of this embodiment has only a single coating layer due to a single metal conductive sheet, which not only reduces the volume of the winding 4 but also reduces the required winding space, thereby reducing the volume of the inductor 1 This is beneficial to miniaturization, and the copper loss of the winding 4 can also be reduced to improve the efficiency of the inductor 1 . In addition, as shown in Fig. 2, the structure of the first magnetic core 3 of the inductor 1 in this case is actually similar to that of the E-shaped magnetic core by removing one of the two side legs, that is, the first magnetic core of this case. The core 2 only includes a first column 21 similar to the center column and a second column 22 similar to the side column, so compared with the E-type magnetic core, the heat dissipation direction has only two sides (similar to the first column). 2), the first magnetic core 1 in this case can provide the direction of heat dissipation on three sides of the winding 4 (as shown in the directions A, B, and C in Fig. 2), so that the inductance of this embodiment is 1 The heat dissipation efficiency is improved.

In some embodiments, the first column 21 can be circular, and the second column 22 can be arcuate, circular, square, rectangular, trapezoidal, oval, irregular geometric shape, or a combination of at least any of the above. . In addition, the area of the top surface 210 of the first cylinder 21 is substantially equal to the area of the top surface 220 of the second cylinder 22 . What's more, the area of the top surface 200 of the connecting portion 20 is larger than the area of the bottom surface (not shown) of the first column 21 connected to the top surface 200 of the connecting portion 20 .

In other embodiments, the winding 4 can be formed by winding a single metal conductive sheet 40 for two turns, or the winding 4 can be formed by winding a single metal conductive sheet 40 three times or less. In addition, the ratio of the width W2 to the thickness T2 of the single metal conductive sheet 40 is substantially greater than or equal to 0.5, but less than or equal to 20. The thickness T2 of the single metal conductive sheet 40 is substantially greater than or equal to 1 mm, but less than or equal to 3 mm, preferably 2 mm, and the width W2 of the single metal conductive sheet 40 is substantially greater than or equal to 6 mm, but less than or equal to 25 mm, preferably 12.8 mm.

Please refer to FIG. 4 in conjunction with FIG. 3 , wherein FIG. 4 is a schematic diagram of the exploded structure of the inductor according to the second preferred embodiment of the present invention. As shown in FIG. 4, the structure of the inductor 1a of this embodiment is similar to the structure of the inductor 1 shown in FIG. 1, and the same components are given the same symbols and the description is omitted, except for the winding 4 of the inductor 1a of this embodiment. It further includes a first end portion 400, a second end portion 401 and a first conducting portion 41, wherein the first end portion 400 and the second end portion 401 are located at opposite ends of the winding 4. For example, as shown in FIG. The end portion 400 is located on the opposite outer side of the winding 4 , and the second end portion 401 is located on the opposite inner side of the winding 4 . The first conducting portion 41 is integrally formed with the first end portion 400 of the winding 4, and extends from the first end portion 400 of the winding 4 toward the direction of the first magnetic core 2. The first conducting portion 41 is used for connecting with the transformer (not shown). shown) and/or the system motherboard (not shown), etc. are connected by soldering.

In some embodiments, the winding 4 further includes a second conducting portion 42 . The second conducting portion 42 is integrally formed with the second end portion 401 of the winding 4 , and the second end portion 401 of the winding 4 faces the second magnetic core. The second conducting portion 42 is used for connecting with the transformer and/or the system motherboard by welding.

In the inductor 1a of this embodiment, the first lead portion 41 and the second lead portion 42 are directly extended from the first end portion 400 and the second end portion 401 of the winding 4, respectively, so the winding 4 does not need any additional Soldering the copper bars can be directly connected to the transformer and/or the system motherboard, so the welding points on the winding 4 of the inductor 1a of this embodiment can be reduced a lot, so that the current flow area on the winding 4 is increased. The inductor 1a of the embodiment can be more suitable for applications with relatively large power design due to the increase in the area where the current can flow.

Of course, the extending directions of the first conducting portion 41 and the second conducting portion 42 from the first end portion 400 and the second end portion 401 of the winding 4 are not limited to those shown in FIG. 4 , and can be determined according to actual needs. Instead, it extends in an appropriate direction, for example, by bending.

In some embodiments, the first conducting portion 41 and the second conducting portion 42 may include holes 410 and 420 respectively. The arrangement of the holes 410 and 420 can help the winding 4 to be more effectively welded to the transformer and/or the system. On the main board, the heat energy of the welding is blocked from being conducted to the winding 4 at the same time, so as to achieve the effect of heat insulation.

Please refer to FIG. 5 , which is a schematic diagram of the exploded structure of the inductor according to the third preferred embodiment of the present invention. As shown in FIG. 5, the inductor 1b of this embodiment includes two first magnetic cores 2a, 2b, a second magnetic core 3 and two windings 4 to form a multi-inductance structure, wherein the two first magnetic cores 2a, The structures of 2b are the same as those of the first magnetic core 2 shown in Fig. 1, respectively. The structure of the second magnetic core 3 of the inductor 1b is the same as that of the second magnetic core 3 shown in Fig. 1. The structures of the two windings 4 are also the same as the structures of the windings 4 shown in FIG. 1 , and the same elements are given the same reference numerals, and the description thereof will be omitted.

In this embodiment, the number of the windings 4 corresponds to the number of the first magnetic cores, that is, corresponding to the two first magnetic cores 2a and 2b, so the inductor 1b includes two windings 4, and each winding 4 is directly sleeved. It is arranged on the first cylinder 21 of the corresponding first magnetic core among the two first magnetic cores 2a, 2b, and part of the winding 4 is located in the wire winding slot 23 of the corresponding first magnetic core. In addition, the first magnetic core 2b is located between the first magnetic core 2a and the second magnetic core 3, wherein the connecting portion 20 of the first magnetic core 2b is connected to the first column 21 of the first magnetic core 2b compared to the first column 21 of the first magnetic core 2b. The first pillars 21 of the magnetic core 2a are adjacent to each other.

Please refer to FIG. 6 , which is a schematic diagram of an exploded structure of the inductor according to the fourth preferred embodiment of the present invention. As shown in FIG. 6, the inductor 1c of this embodiment includes two first magnetic cores 2a, 2b, a second magnetic core 3 and two windings 4 to form a multi-inductance structure, wherein the two first magnetic cores 2a, The structures of 2b are respectively the same as those of the first magnetic core 2 shown in FIG. 1, the structure of the second magnetic core 3 of the inductor 1c is the same as that of the second magnetic core 3 shown in FIG. The structures of the two windings 4 are also the same as the structures of the windings 4 shown in FIG. 1 , and the same elements are given the same reference numerals, and the description thereof will be omitted.

In this embodiment, the number of the windings 4 corresponds to the number of the first magnetic cores, that is, corresponding to the two first magnetic cores 2a and 2b. Therefore, the inductor 1c includes two windings 4, each of which is directly sleeved. It is arranged on the first cylinder 21 of the corresponding first magnetic core among the two first magnetic cores 2a, 2b, and part of the winding 4 is located in the wire winding slot 23 of the corresponding first magnetic core. In addition, the second magnetic core 3 is located between the first magnetic core 2a and the first magnetic core 2b, wherein two opposite sides of the second magnetic core 3 are respectively connected to the first cylinder 21 and the second magnetic core of the first magnetic core 2a. The first pillars 21 of the core 2b are adjacent to each other.

Please refer to FIG. 7 , which is a schematic diagram of the exploded structure of the inductor according to the fifth preferred embodiment of the present invention. As shown in FIG. 7, the inductor 1d of this embodiment includes three first magnetic cores 2a, 2b, 2c and three windings 4 to form a multi-inductance structure, wherein the three first magnetic cores 2a, 2b, 2c The structures are respectively the same as those of the first magnetic core 2 shown in FIG. 1, and the structures of the three windings 4 of the inductor 1d are also the same as the structures of the windings 4 shown in FIG. 1, so the same elements are assigned the same structure. Symbols are omitted, and descriptions are omitted.

In this embodiment, the number of the windings 4 corresponds to the number of the first magnetic cores, that is, corresponds to the three first magnetic cores 2a, 2b, 2c, so the inductor 1d includes three windings 4, each of which is respectively It is directly sleeved on the first cylinder 21 of the corresponding first magnetic core among the three first magnetic cores 2a, 2b, 2c, and part of the winding 4 is located in the winding slot 23 of the corresponding first magnetic core. In addition, the first magnetic core 2b is located between the first magnetic core 2a and the first magnetic core 2c, wherein the first column 21 of the first magnetic core 2b is connected to the connecting portion 20 of the first magnetic core 2b with respect to the connecting portion 20 of the first magnetic core 2b. The first column 21 of the first magnetic core 2a is adjacent, and the connecting portion 20 of the first magnetic core 2b is opposite to the first column 21 of the first magnetic core 2b and the first column of the first magnetic core 2c located on the outside The bodies 21 are adjacent.

In addition, the inductances 1, 1a, 1b, 1c, 1d mentioned above can all be applied to the power conversion circuit of the power supply to form the output inductance of the power conversion circuit, wherein the topology of the power conversion circuit includes but is not limited to Full Bridge Phase Shift Converter, Half Bridge Converter, Full Bridge Converter, Forward Converter, Push-Pull Converter ( Push Pull Converter), Buck Converter, Half Bridge LLC Series Resonant Converter, Full Bridge LLC Series Resonant Converter, etc.

To sum up, the present application provides an inductor, wherein the winding of the inductor is wound by a single metal conductive sheet, so that the volume of the winding is small and the required winding space is reduced, thereby reducing the volume of the inductor, which is beneficial to the Miniaturization, and the copper loss of the winding can also be reduced to improve the efficiency of the inductor. In addition, the first magnetic core of the inductor in this case only includes two cylinders, a first cylinder and a second cylinder, so the first magnetic core can provide heat dissipation directions on three sides of the winding, so that the heat dissipation efficiency of the inductor in this case is improved. .

It should be noted that the above-mentioned preferred embodiments are only proposed to illustrate the present case, and the present case is not limited to the described embodiments, and the scope of the present case is determined by the scope of the appended patent application. And this case can be modified by Shi Jiangsi, a person who is familiar with this technology, but none of them can be protected as attached to the scope of the patent application.

1, 1a, 1b, 1c, 1d: Inductance 2, 2a, 2b, 2c: the first magnetic core 3: The second magnetic core 4: Winding 20: Connection part 21: The first cylinder 22: Second cylinder 200, 210, 220: top surface 23: Winding slot 40: Single metal conductive sheet W1, W2: width T1, T2: Thickness 41: The first lead part 42: The second lead part

Figure 1 is a schematic diagram of the combined structure of the inductor according to the first preferred embodiment of the present application; Figure 2 is a schematic diagram of the exploded structure of the inductor shown in Figure 1; Figure 3 is a schematic diagram of the structure of the winding of the inductor shown in Figure 1 when it is not wound; FIG. 4 is a schematic diagram of the exploded structure of the inductor according to the second preferred embodiment of the present application; FIG. 5 is a schematic diagram of the exploded structure of the inductor according to the third preferred embodiment of the present application; FIG. 6 is a schematic diagram of the exploded structure of the inductor according to the fourth preferred embodiment of the present application; FIG. 7 is a schematic diagram of the exploded structure of the inductor according to the fifth preferred embodiment of the present invention.

1: Inductance

2: The first magnetic core

3: The second magnetic core

4: Winding

20: Connection part

21: The first cylinder

22: Second cylinder

200, 210, 220: top surface

23: Winding slot

W1: width

T1: Thickness

A, B, C: direction

Claims (14)

An inductor that contains: At least one first magnetic core includes a connecting part, a first cylinder and a second cylinder, wherein the first cylinder and the second cylinder are arranged on a top surface of the connecting part, and the first cylinder A winding slot is included between a cylinder and the second cylinder; a second magnetic core disposed adjacent to the first magnetic core; and At least one winding, each of which is formed by winding a single metal conductive sheet for at least one turn, and each of the windings is sleeved on the first cylinder of the corresponding first magnetic core, and each of the windings is partially Located in the winding slot of the corresponding first magnetic core, and the overall thickness of the winding located in the winding slot is less than or equal to a width of the winding slot and greater than 0.9 of the width of the winding slot times. The inductor of claim 1, wherein the second magnetic core is an I-shaped magnetic core. The inductor as claimed in claim 1, wherein the first cylinder is circular, and the second cylinder is arcuate, circular, square, rectangular, trapezoidal, oval, irregular geometric shape, or at least any two of the above. Combine shapes. The inductor of claim 1, wherein the first cylinder includes a top surface, the second cylinder includes a top surface, and the area of the top surface of the first cylinder is equal to the area of the second cylinder area of the top surface. The inductor as claimed in claim 1, wherein each of the windings is composed of two or less turns of the single metal conductive sheet, or each of the windings is composed of three or less turns of the single metal conductive sheet. The inductor according to claim 1, wherein a ratio of a width to a thickness of the single metal conductive sheet is greater than or equal to 0.5 and less than or equal to 20. The inductor as claimed in claim 1, wherein a thickness of the single metal conductive sheet is greater than or equal to 1 mm and less than or equal to 3 mm, and a width of the single metal conductive sheet is greater than or equal to 6 mm and less than or equal to 25 mm . The inductor of claim 1, wherein each of the windings includes a first end portion, a second end portion and a first conductive portion, the first end portion and the second end portion are located at opposite two ends of the winding. end, the first conducting portion extends from the first end portion toward the direction of the first magnetic core. The inductor of claim 8, wherein each of the windings includes a second conductive portion extending from the second end toward the direction of the second magnetic core. The inductor as claimed in claim 9, wherein the first conducting portion and the second conducting portion respectively comprise a hole. The inductor of claim 1, wherein the inductor constitutes at least one output inductor for use in a full-bridge phase-shift converter, a half-bridge converter, a full-bridge converter, a forward converter, a push-pull converter in a buck converter, a half-bridge LLC series resonant converter, or a full-bridge LLC series resonant converter. The inductor as claimed in claim 1, wherein the inductor comprises two of the first magnetic cores and two of the windings, one of the two first magnetic cores is located on the other of the first magnetic cores and between the second magnetic cores, and the connecting portion of one of the first magnetic cores is adjacent to the first column of the other first magnetic core. The inductor of claim 1, wherein the inductor comprises two of the first magnetic cores and two of the windings, the second magnetic core is located between the two of the first magnetic cores, and two of the second magnetic cores The opposite side surfaces are respectively adjacent to the first cylinders of the two first magnetic cores. An inductor that contains: Three first magnetic cores, one of the three first magnetic cores, the magnetic core group is located between the other two first magnetic cores, and each of the first magnetic cores includes a connecting part, a first magnetic core A cylinder and a second cylinder, wherein the first cylinder and the second cylinder are arranged on a top surface of the connecting portion, and a winding is included between the first cylinder and the second cylinder slot; and At least one winding, each of which is formed by winding a single metal conductive sheet for at least one turn, and each of the windings is sleeved on the first cylinder of the corresponding first magnetic core, and is partially located in the corresponding In the winding slot of the first magnetic core, and the overall thickness of the winding is less than or equal to a width of the winding slot, and greater than 0.9 times the width of the winding slot; Wherein the first column body of the first magnetic core located between the two first magnetic cores is adjacent to the first column body of the magnetic core set, one of the two first magnetic cores located outside , the connecting portion of the first magnetic core located between the two first magnetic cores is adjacent to the first cylinder in the other magnetic core group of the two first magnetic cores located outside.

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