TWI744104B - 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 inductive components, are often used to meet 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 will have a coating layer, resulting in a larger volume of traditional inductors requiring larger windings. The wire space, in turn, makes the volume of the traditional inductor relatively large, which is not conducive to miniaturization, and because each coil of the winding of the traditional inductor has a coating layer, the copper loss of the winding increases and the efficiency of the traditional inductor is reduced.

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

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

Another objective of this case is to provide an inductor which can improve heat dissipation.

To achieve the above objective, the present application provides an inductor including: at least one first magnetic core, including a connecting portion, a first pillar and a second pillar, wherein the first pillar and the second pillar are disposed on the top surface of the connecting portion The upper side is respectively adjacent to two opposite outer sides of the top surface, and a winding slot is included between the first column and the second column; the second magnetic core is arranged adjacent to the first magnetic core; and at least one winding , Each winding is formed by winding at least one turn of a single metal conductive sheet, and each winding is sleeved on the corresponding first cylinder and partly located in the winding slot of the corresponding first magnetic core, and the thickness of the winding Less than or equal to the width of the winding groove, and greater than 0.9 times the width of the winding groove.

In order to achieve the above-mentioned purpose, this case also provides an inductor, including: 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 connecting part, a first column and a second column, wherein the first column and the second column are arranged on the top surface of the connecting part, and a winding groove is included between the first column and the second column And at least one winding, each winding is formed by winding at least one turn of a single metal conductive sheet, and each winding is sleeved on the first cylinder of the corresponding first magnetic core, and is partially located in the corresponding first magnetic In the winding groove of the core, the overall thickness of the winding in the winding groove is less than or equal to the width of the winding groove and greater than 0.9 times the width of the winding groove; among them, the first core located between the two first magnetic cores The first column system of a magnetic core is adjacent to the first column of one of the two first magnetic cores located on the outer side, and the connection part of the first magnetic core located between the two first magnetic cores It is adjacent to the first column of the other magnetic core group of the two first magnetic cores located on the outer side.

Some typical embodiments embodying the features and advantages of this case will be described in detail in the following description. It should be understood that this case can have various changes in different aspects, which do not deviate from the scope of this case, and the descriptions and drawings therein are essentially for illustrative purposes, rather than being constructed to limit the case. In addition, numerical ranges or parameters inherently contain errors that exist in individual tests or measurements, and, as used herein, the term "about" or "substantially" generally means 10% of a given value or range, Within 5%, 1% or 0.5%. Alternatively, the term "approximately" or "substantially" means within the error acceptable to those skilled in the art.

Please refer to Figure 1, Figure 2, and Figure 3. Figure 1 is a schematic diagram of the combined structure of the inductor in the first preferred embodiment of the present invention, Figure 2 is a schematic diagram of the exploded structure of the inductor shown in Figure 1. Figure 3 is a schematic diagram showing the structure of the inductor winding 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 pillar 21, and a second pillar 22. The first pillar 21 and the second pillar 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, and the first column 21 and the second column 22 and the connecting portion 20 can be, but not limited to, integrally formed. In addition, the first column 21 and the second column 22 further include a winding groove 23.

The second magnetic core 3 is arranged adjacent to the first magnetic core 2 to cover part of the structure of the first magnetic core 2, for example, at least covers the top surface 210 of the first column 21 and the top surface 220 of the second column 22. In some embodiments, the second magnetic core 3 is preferably an I-type magnetic core, but it is 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, wound by at least one turn, and the winding 4 is directly sleeved on the first without using a bobbin. On a cylinder 21, part of the winding 4 is located in the winding slot 23, and there are other parts of the winding 4 exposed outside the first magnetic core 2 and the second magnetic core 3, of which the winding 4 is located in the winding slot 23 The overall thickness T1 is substantially less than or equal to the width W1 of the winding groove 23, and substantially greater than 0.9 times the width W1 of the winding groove 23. In some embodiments, the winding 4 may further include a first end 400 and a second end 401 opposite to each other.

It can be seen from the above that, compared with the traditional inductor which is 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 in this embodiment is wound by a single metal conductive sheet, The winding 4 of this embodiment has only a single coating layer due to a single metal conductive sheet. As a result, not only the volume of the winding 4 is smaller, the required winding space is reduced, and the volume of the inductor 1 is reduced. 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 Figure 2, the structure of the first magnetic core 3 of the inductor 1 in this case is actually similar to removing one of the two side legs of the E-shaped core, 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. Therefore, compared with the E-shaped core, the heat dissipation direction has only two sides (similar to the first column). 2 shows the directions A, B), the first magnetic core 1 in this case can provide a total of three winding 4 heat dissipation directions (such as the directions A, B, C shown in the second diagram), so that the inductor of this embodiment 1 The heat dissipation efficiency is improved.

In some embodiments, the first cylinder 21 may be circular, and the second cylinder 22 may be arcuate, circular, square, rectangular, trapezoidal, elliptical, irregular geometric shape, or a combination of at least two of the above. . In addition, the area of the top surface 210 of the first column 21 is substantially equal to the area of the top surface 220 of the second column 22. Furthermore, 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 may be formed by winding a single metal conductive sheet 40 with two turns, or the winding 4 may be formed by winding a single metal conductive sheet 40 with less than three turns. 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, and preferably 2 mm, and the width W2 of the single metal conductive sheet 40 is substantially greater than or equal to 6 mm, but It is less than or equal to 25 mm, and preferably 12.8 mm.

Please refer to FIG. 4 in conjunction with FIG. 3. FIG. 4 is a schematic diagram of an exploded structure of the inductor of 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. 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 400, a second end 401, and a first connecting portion 41. The first end 400 and the second end 401 are located at opposite ends of the winding 4, for example, as shown in Figure 4, the first The end 400 is located on the opposite outer side of the winding 4, and the second end 401 is located on the opposite inner side of the winding 4. The first conductive portion 41 is integrally formed with the first end 400 of the winding 4, and extends from the first end 400 of the winding 4 in the direction of the first magnetic core 2. The first conductive portion 41 is used to connect with the transformer (not (Pictured) and/or system motherboard (not shown) are connected by soldering.

In some embodiments, the winding 4 further includes a second conductive portion 42, which is integrally formed with the second end 401 of the winding 4, and the second end 401 of the winding 4 faces the second magnetic core. Extending in the direction of 3, the second connecting portion 42 is used to connect with the transformer and/or the system main board by welding.

In the inductor 1a of this embodiment, by directly extending the first conductive portion 41 and the second conductive portion 42 from the first end 400 and the second end 401 of the winding 4, the winding 4 does not require additional The copper bar can be directly connected to the transformer and/or the system motherboard by welding. Therefore, the welding points on the winding 4 of the inductor 1a of this embodiment can be reduced a lot. As a result, the current flow area on the winding 4 is increased, so the current The inductor 1a of the embodiment can be more suitable for applications where the power design is relatively large due to the increase in the current flow area.

Of course, the directions in which the first connecting portion 41 and the second connecting portion 42 respectively extend from the first end 400 and the second end 401 of the winding 4 are not limited to those shown in FIG. 4, and can be based on actual needs. Instead, it extends in an appropriate direction in a manner such as bending.

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

Please refer to FIG. 5, which is a schematic diagram of an exploded structure of the inductor of 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, in which two first magnetic cores 2a, The structure of 2b is the same as the structure of the first magnetic core 2 shown in Figure 1, and the structure of the second magnetic core 3 of the inductor 1b is the same as the structure of the second magnetic core 3 shown in Figure 1. The structure of the two windings 4 is also the same as the structure of the winding 4 shown in FIG.

In this embodiment, the number of windings 4 corresponds to the number of first magnetic cores, that is, corresponds to the two first magnetic cores 2a, 2b. Therefore, the inductor 1b includes two windings 4, and each winding 4 is directly sheathed. It is arranged on the first cylinder 21 of the corresponding first magnetic core of the two first magnetic cores 2a, 2b, 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 second magnetic core 3. 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, in which two first magnetic cores 2a, The structure of 2b is the same as the structure of the first magnetic core 2 shown in Figure 1, and the structure of the second magnetic core 3 of the inductor 1c is the same as the structure of the second magnetic core 3 shown in Figure 1. The structure of the two windings 4 is also the same as the structure of the winding 4 shown in FIG.

In this embodiment, the number of windings 4 corresponds to the number of first magnetic cores, that is, corresponds to the two first magnetic cores 2a, 2b. Therefore, the inductor 1c includes two windings 4, and each winding 4 is directly sheathed. It is arranged on the first cylinder 21 of the corresponding first magnetic core of the two first magnetic cores 2a, 2b, and part of the winding 4 is located in the 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. The first pillars 21 of the core 2b are adjacent to each other.

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

In this embodiment, the number of windings 4 corresponds to the number of first magnetic cores, that is, corresponds to the three first magnetic cores 2a, 2b, 2c, so the inductor 1d includes three windings 4, and each winding 4 is 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, and the connecting portion 20 of the first column 21 of the first magnetic core 2b relative to the first magnetic core 2b is connected to the outer side 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 outside The bodies 21 are adjacent.

In addition, the aforementioned inductors 1, 1a, 1b, 1c, and 1d can be used in the power conversion circuit of a power supply to form the output inductor of the power conversion circuit. 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.

In summary, this case provides an inductor, in which 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 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 pillars, the first pillar and the second pillar. Therefore, the first magnetic core can provide the heat dissipation direction of the winding on three sides, so that the heat dissipation efficiency of the inductor in this case is improved. .

It should be noted that the above is only a preferred embodiment for explaining the case, and the case is not limited to the described embodiment. The scope of the case is determined by the scope of the patent application attached. Moreover, this case can be modified in many ways by those who are familiar with this technology, but none of them deviates from the protection of the scope of the patent application.

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

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

1: inductance

2: The first core

3: The second core

4: winding

20: Connection part

21: The first cylinder

22: second cylinder

200, 210, 220: top surface

23: Winding groove

W1: width

T1: thickness

A, B, C: direction

Claims (14)

An inductance that contains: At least one first magnetic core includes a connecting portion, a first pillar and a second pillar, wherein the first pillar and the second pillar are disposed on a top surface of the connecting portion, and the first pillar A winding groove is included between a column and the second column; A second magnetic core, adjacent to the first magnetic core; and At least one winding, each winding is formed by winding at least one turn of a single metal conductive sheet, and each winding is sleeved on the first cylinder corresponding to the first magnetic core, and each winding part The overall thickness of the winding located in the winding slot of the corresponding first magnetic core and 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 according to claim 1, wherein the second magnetic core is an I-type magnetic core. The inductor according to claim 1, wherein the first cylinder is circular, and the second cylinder is arcuate, circular, square, rectangular, trapezoidal, elliptical, irregular geometric shape, or at least two of the above Combination shape. The inductor according to claim 1, wherein the first column includes a top surface, the second column includes a top surface, and the area of the top surface of the first column is equal to that of the second column The area of the top surface. The inductor according to claim 1, wherein each of the windings is formed by winding the single metal conductive sheet with less than two turns, or each of the windings is formed by winding the single metal conductive sheet with less than three turns. The inductor according to claim 1, wherein the 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 according to 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 according to claim 1, wherein each of the windings includes a first end, a second end, and a first conductive portion, and the first end and the second end are located at two opposite sides of the winding The first connecting portion extends from the first end toward the first magnetic core. The inductor according to claim 8, wherein each of the windings includes a second conductive portion, and the second conductive portion extends from the second end portion toward the second magnetic core. The inductor according to claim 9, wherein the first conductive portion and the second conductive portion each include a hole. The inductor according to claim 1, wherein the inductor constitutes at least one output inductor and is applied to a full-bridge phase-shift converter, a half-bridge converter, a full-bridge converter, a forward converter, and a push-pull Type converter, a buck converter, a half-bridge LLC series resonant converter, or a full-bridge LLC series resonant converter. The inductor according to claim 1, wherein the inductor includes two of the first magnetic cores and two of the windings, and one of the two first magnetic cores is located on the other of the first magnetic cores And the second magnetic core, 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 according to claim 1, wherein the inductor includes two first magnetic cores and two windings, the second magnetic core is located between the two first magnetic cores, and two of the second magnetic cores The opposite side surfaces are respectively adjacent to the first pillars of the two first magnetic cores. An inductance 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 portion, a first A column and a second column, wherein the first column and the second column are disposed on a top surface of the connecting portion, and a winding is included between the first column and the second column Slot; and At least one winding, each winding is formed by winding at least one turn of a single metal conductive sheet, and each winding is sleeved on the first cylinder corresponding to the first magnetic core, and is partially located on the corresponding one 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; The first column system of the first magnetic core located between the two first magnetic cores is adjacent to one of the two first magnetic cores located outside the first column of the magnetic core group , The connecting portion of the first magnetic core located between the two first magnetic cores is adjacent to the first column in the other magnetic core group of the two first magnetic cores located on the outer side.

Images