TWM548349U - Inductor structure - Google Patents

Description

Inductive structure

This case relates to an inductive structure, especially an inductive structure with high winding utilization.

The inductive component with choke coils is composed of a magnetic core and a coil wound around the magnetic core, which can suppress electromagnetic interference in the circuit or prevent clutter signals generated by electromagnetic interference, which is common in Power supply for electronic equipment and appliances, power electronics and high frequency equipment.

The traditional choke coil adopts a ring design, which mainly uses a hook to wind the coil around the closed toroidal core, which is time-consuming and labor-intensive, and since the inner circle of the core needs to reserve the space required for the hook to pull the wire, the coil is The wire winding utilization rate is poor, which is not conducive to miniaturization. In addition, the annular core structure is also disadvantageous for opening an air gap thereon, because the opening of the air gap not only affects the integrity of the overall structure, but is more likely to cause damage and breakage of the core during assembly or hook winding.

On the other hand, in order to improve the power quality, Power Factor Correction (PFC) has become an important consideration in circuit design. Among the circuit application systems with stricter size requirements, the interleaved PFC (Interleaved PFC) design is more inclined. In the original single large power PFC section, the power is changed to two powers of half of the smaller power PFC. Paragraphs are replaced to facilitate miniaturization of the system circuitry. If the traditional PFC circuit system with choke coil is designed, the system needs to load two toroidal coils. However, it is limited by the hook and hook process. The low rate is not conducive to the miniaturization of the interleaved PFC circuit system.

Therefore, how to provide an inductive structure with high wire-wound utilization is an extremely problem to be solved in the field.

The purpose of this case is to provide an inductor structure. By combining the U-type and I-type magnetic cores, the choke coil is more mirror-symmetrically wound around the two arms of the U-shaped core, and the resulting inductive magnetic circuit is more symmetrical. Sex. The pre-wound coil group can be directly sleeved on the two arms of the U-shaped magnetic core, and the space for the hook wire is not required to be reserved, and the wire winding utilization rate is high, which is advantageous for reducing the overall volume of the inductor structure.

Another object of the present invention is to provide an inductive structure, which is formed by integrating a U-shaped and an I-shaped magnetic core to form an integrated PFC circuit instead of a two-piece double-ring structure, thereby facilitating miniaturization of the overall structure. Improve the density of construction and space utilization. In addition, when the I-type magnetic core is made of a high magnetic permeability material, in addition to helping to improve light load efficiency and reduce core loss, the material cost can be reduced.

To achieve the foregoing objective, the present invention provides an inductive structure including a first magnetic core, a second magnetic core, and at least one coil assembly. The first core has a first surface. The second core has two arms and a connecting portion. The connecting portion is connected to the first surface of the first magnetic core, and is connected between the two arms, and is respectively connected to the first surface of the first magnetic core through the two arms. The coil set has two openings respectively corresponding to the two arms of the second magnetic core, and is disposed on the two arms through the two openings.

To achieve the foregoing objective, the present invention further provides an inductive structure including a first magnetic core, a second magnetic core, a third magnetic core, at least one first coil, and at least one second coil. The first magnetic core has a first surface and a second surface, and the first surface and the second surface are opposite to each other. The second core has two first arms and a first connecting portion. The first connecting portion is connected between the first arm and the first surface of the first magnetic core, and is connected to the first surface of the first magnetic core through the two first arms. The third core has two second branches An arm and a second connecting portion, wherein the second connecting portion is connected between the second arm and the second surface of the first magnetic core, and is connected to the second magnetic core by the second arm surface. The at least one first coil group has two first openings respectively corresponding to the two first arms of the second magnetic core, and the two first openings are sleeved on the two first arms. The at least one second coil group has two second openings respectively corresponding to the second arms of the third magnetic core, and the second openings are sleeved on the second second arms.

1, 1a‧‧‧Inductive structure

10‧‧‧First core

11‧‧‧ first surface

12‧‧‧ second surface

20‧‧‧second core

21‧‧‧First connection (connection)

22, 23‧‧‧ first arm (arm)

30‧‧‧First coil set (coil set)

30a, 30b‧‧‧ coil set

31‧‧‧First opening (opening)

32‧‧‧Guide end

40‧‧‧Substrate

41‧‧‧ hole

50‧‧‧Three core

51‧‧‧Second connection

52, 53‧‧‧ second arm

60‧‧‧second coil set

61‧‧‧second opening

62‧‧‧Guide end

AA, BB‧‧ ‧ line segments

D ₁ , D ₂ , D ₃ , D ₄ , D ₅ , D ₆ , D ₇ , D ₈ ‧‧‧ thickness

Fig. 1 is an exploded view showing the inductance structure of the first preferred embodiment of the present invention.

Figure 2 is a perspective view showing the inductance structure of the first preferred embodiment of the present invention.

Figure 3 is a cross-sectional view along line AA of Figure 2.

4A and 4B are diagrams showing the coil assembly of the inductive structure in the first preferred embodiment of the present invention.

Figure 5 is an exploded view showing the inductance structure of the second preferred embodiment of the present invention.

Figure 6 is a perspective view showing the inductance structure of the second preferred embodiment of the present invention.

Figure 7 is a cross-sectional view along line BB of Figure 6.

Fig. 8 is a cross-sectional view showing another embodiment of the BB line in Fig. 6.

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in the various aspects of the present invention, and the description and drawings are intended to be illustrative and not limiting.

Fig. 1 is an exploded view showing the inductance structure of the first preferred embodiment of the present invention. Figure 2 is a perspective view showing the inductance structure of the first preferred embodiment of the present invention. As shown in FIGS. 1 and 2, the inductive structure 1 includes a first core 10, a second core 20, and at least one coil assembly 30. The first core 10 has a first surface 11. The second core 20 has a connecting portion 21 and two arms 22, 23. The connecting portion 21 is connected between the two arms 22, 23 with respect to the first surface 11 of the first magnetic core 10, and is connected to the first surface 11 of the first magnetic core 10 through the two arms 22, 23, respectively. The first magnetic core 10 and the second magnetic core 20 are configured together to form a magnetic circuit. The coil assembly 30 has two openings 31 corresponding to the two arms 22, 23 of the second core 20, and is sleeved on the two arms 22, 23 through the two openings 31, so that the first core 10 and the second core The magnetic circuit of the 20 common architecture passes through the coil assembly 30. In the present embodiment, the inductive structure 1 further includes a substrate 40, wherein the first core 10, the second core 20 and the coil assembly 30 are disposed on the substrate 40, and the coil assembly 30 has at least two guiding ends 32. The substrate 40 is bored corresponding to the hole 41 provided in the substrate 40. In one embodiment, the first core 10, the second core 20 and the coil assembly 30 are further fixed to the substrate 40 through a fixing colloid (not disclosed), and the guiding end 32 of the coil assembly 30 penetrates the substrate through the hole 41. 40 and lead. However, the substrate 40 and the fixed colloid are not necessary for limiting the technical features of the present invention, and will not be described herein.

Specifically, the first magnetic core 10 and the second magnetic core 20 of the inductive structure 1 of the present invention are respectively an I-type magnetic core and a U-shaped magnetic core, so that the coil assembly 30 is mirror-symmetrically wound around the second magnetic core 20 The two arms 22, 23 have a more symmetrical magnetic circuit. Figure 3 is a cross-sectional view along line AA of Figure 2. As shown in the figure, in the inductor structure 1 of the present invention, the thickness D ₁ of the connecting portion 21 of the second core 20 is the same as the thicknesses D ₂ and D _{3 of the} two arms 22 and 23, and also the thickness of the first core 10 D _{4 is the} same. In other words, the connecting portion 21 of the second magnetic core 20, the two arms 22, 23 and the first magnetic core 10 have the same vertical cross-sectional area on the formed magnetic circuit, so that the coil assembly 30 is mirror-symmetrically wound around the second magnetic core. The two arms 22, 23 of the core 20 are used to achieve a stable inductive magnetic circuit.

It should be noted that, in this embodiment, the coil assembly 30 is further a pre-wound forming structure to form a structure of the two openings 31 in advance. 4A and 4B are diagrams showing the coil assembly of the inductive structure in the first preferred embodiment of the present invention. As shown, in the present embodiment, the coil group 30 can be constituted by two separate coil groups 30a and 30b as shown in Fig. 4A. The coil groups 30a and 30b have the same structure and have two guiding ends 32 for pre-winding the two openings 31 of the forming structure, so that the coil group 30 can be mirror-symmetrically disposed on the two arms of the second magnetic core 20. 22, 23. In another embodiment, the coil assembly 30 can be pre-wound by the single wire body to form the two openings 31, so that the coil assembly 30 can be mirror-symmetrically disposed on the two arms 22, 23 of the second magnetic core 20. It should be emphasized that the number of the coil sets 30, the number of the guiding ends 32, the number of turns that are sleeved on the two arms 22, 23, etc., can be formed together when the two openings 31 are pre-wound, and can be visually observed. Modulation of application requirements is not a necessary condition to limit the technical characteristics of this case. The coil structure 30 of the present invention can be directly sleeved on the two arms 22, 23 of the second core 20 through the pre-wound coil assembly 30, and there is no need to reserve space for the hook wire between the two arms 23, 23. The space utilization ratio between the two arms 22 and 23 of the coil assembly 30 is effectively improved, the winding utilization ratio is improved, and the overall volume of the inductor structure 1 is advantageously reduced.

Figure 5 is an exploded view showing the inductance structure of the second preferred embodiment of the present invention. Figure 6 is a perspective view showing the inductance structure of the second preferred embodiment of the present invention. In the present embodiment, the inductive structure 1a is similar to the inductive structure 1 shown in FIGS. 1 and 2, and the same reference numerals are given to the same elements, structures, and functions, and will not be described again. Different from the inductive structure 1 shown in FIG. 1 and FIG. 2 , the inductive structure 1 a of the embodiment further adopts an inductive design of an interleaved PFC circuit, and the structure includes a first magnetic core 10 and a second magnetic core 20 . The third core 50, the at least one first coil group 30, and the at least one second coil group 60. The first magnetic core 10 has a first surface 11 and a second surface 12, and the first surface 11 and the second surface 12 are opposite to each other. The second core 20 has a first connecting portion 21 and two first arms 22, 23. The first connecting portion 21 is connected to the first surface 11 of the first magnetic core 10 and connected to the two first arms 22, 23 And connected to the first surface 11 of the first magnetic core 10 through the two first arms 22, 23, respectively. The third core 50 has a second connecting portion 51 and two second arms 52, 53. The second connecting portion 51 is connected to the second surface 52 of the first magnetic core 10 and the second arm 52, 53. And connected to the second surface 12 of the first magnetic core 10 through the two second arms 52, 53, respectively. The at least one first coil assembly 30 has two first openings 31 corresponding to the two first arms 22, 23 of the second core 20, and the two first openings 31 are sleeved on the two first arms 22, 23. The at least one second coil group 60 has two second openings 61 corresponding to the second arms 52, 53 of the third core 50, and the second openings 61 are sleeved on the second arms 52, 53. In the embodiment, the inductive structure 1a further includes a substrate 40, wherein the first core 10, the second core 20, the third core 50, the first coil group 30 and the second coil group 60 are disposed on the substrate 40. . In addition, the first coil assembly 30 has at least two guiding ends 32 extending through the substrate 40, and the second coil group 60 has at least two guiding ends 62, and is penetrated through the holes 41 corresponding to the substrate 40. 40. It should be noted that, in this embodiment, the first coil group 30 and the second coil group 60 are pre-formed to form two first openings 31 and two second openings 61 in advance. Of course, the number of the first coil group 30 and the second coil group 60, the number of the leading ends 32 of the first coil group 30 and the second coil group 60 are set on the first arm 22, The number of turns on the second and second arms 52, 53 and the like can be combined together with the second opening 31 and the second opening 61, and can be modulated according to actual application requirements, not limited. The necessary conditions of the technical features of this case will not be described here. The first coil assembly 30 of the present invention is directly sleeved on the first arm 22, 23 of the second core 20 and the second coil group 60 is directly sleeved on the third core 50. On the second arms 52, 53, there is no need to reserve a hook wire between the first arms 23, 23 of the second core 20 and the second arms 52, 53 of the second core 50. The space can effectively improve the utilization of the winding, and the advantage of reducing the overall volume of the inductor structure 1a.

In the embodiment, the first core 10 is an I-type core, and the second core 20 and the third core 50 are a U-shaped core, so that the first coil group 30 and the second coil group 60 are respectively The first arm 22, 23 of the second core 20 and the second arm 52, 53 of the third core 50 are mirror-symmetrically symmetrical, and the first coil group 30 and the second coil group 60 are also The two sides of the first core 10 are mirror symmetrical. The resulting inductive magnetic circuit is more symmetrical. Figure 7 is a cross-sectional view along line BB of Figure 6. As shown in the figure, in the inductor structure 1a of the present invention, the thickness D ₁ of the first connecting portion 21 of the second core 20 is the same as the thicknesses D ₂ and D _{3 of the} first arms 22 and 23, and also the third magnetic The thickness D ₅ of the second connecting portion 51 of the core 50 and the thicknesses D ₆ and D _{7 of the} second and second arms 52, 53 are the same. In this embodiment, the thickness D ₈ of the first magnetic core 10 is twice the thickness D ₁ , D ₂ , D ₃ , D ₅ , D ₆ , D ₇ , so that the second core 20 and the first coil The combination of the groups 30 and the combination of the third core 50 and the second coil group 60 are respectively symmetrical with the first magnetic core 10 and magnetic paths in the same direction at the first core 10. In addition, in another embodiment, the combination of the second core 20 and the first coil set 30 and the combination of the third core 50 and the second coil set 60 are respectively symmetric with the first core 10 and A magnetic circuit that is opposite in direction and cancels each other at the first core 10. Fig. 8 is a cross-sectional view showing another embodiment of the BB line in Fig. 6. As shown in the figure, in the inductor structure 1a of the present invention, the thickness D ₁ of the first connecting portion 21 of the second core 20 and the thicknesses D ₂ and D _{3 of the} first arms 22 and 23 and the third core 50 The thickness D _{5 of the} second connecting portion 51 is the same as the thicknesses D ₆ , D _{7 of the} second and second arms 52, 53 and the thickness D _{4 of the} first core 10. In other words, the first connecting portion 21 of the second core 20 and the two first arms 22, 23, and the second connecting portion 51 and the second arms 52, 53 of the third core 50 are formed in the inductive structure 1a. The magnetic circuit has the same vertical cross-sectional area, so that the first coil group 30 and the second coil group 60 are combined with the second core 20 and the third core 50, and the interleaved PFC circuit is commonly used with the first core 10 Inductive structure of the design.

It is worth noting that the first core 10 can be adjusted in thickness according to actual application requirements. Moreover, in other embodiments of the interleaved PFC inductor, the second U core 20 has the same magnetic permeability as the third core 50 to maintain symmetry. Compared with the second magnetic core 20 and the third magnetic core 50, the first magnetic core 10 of the I-type is more optional with a magnetic core of high magnetic permeability, so that the magnetic permeability of the first magnetic core 10 is greater than that of the second magnetic core. The magnetic permeability of the 20 and the third core 50 is advantageous for improving the efficiency of the inductive structure 1a at light loads. As the inductive structure 1a in the foregoing embodiment, when the first magnetic core 10 adopts a high magnetic permeability design, the inductance at a light load will be higher, which helps to improve the efficiency and lower the iron of the first magnetic core 10. Core loss. Further, since the material of high magnetic permeability is inexpensive, when applied to the inductance structure 1a in the foregoing embodiment, the thickness of the first magnetic core 10 can be further reduced. For example, in the inductive structure 1a similar to that shown in FIG. 7, when the second core 20 and the third core 50 have the same magnetic permeability and are smaller than the magnetic permeability of the first core 10, the second magnetic the first connecting portion 20 of the core 21 is of _a thickness D and the thickness of the two arms 22 and 23 of the first D _2, D _3, the thickness D of the third core 50 of the second connector portion 51 and two second arms ₅ The thicknesses D ₆ and D _{7 of} 52, 53 are all the same and greater than one-half of the thickness D ₈ of the first core 10. Further, in the inductive structure 1a similar to that shown in FIG. 8, when the second core 20 and the third core 50 have the same magnetic permeability and are smaller than the magnetic permeability of the first core 10, the second core 20 the first connection portion 21 has a thickness D of the thickness of the _{titanium. 1} and 22 and 23 of the first arm D _2, D _3, thickness D of the core 50 of the third portion 51 of the second connector ₅ and the two second arms 52, 53 The thicknesses D ₆ and D ₇ are the same and larger than the thickness D _{4 of the} first core 10 . It should be emphasized that the materials and sizes of the first magnetic core 10, the second magnetic core 20, and the third magnetic core 50 can be modulated according to actual needs. The foregoing embodiments are merely illustrative and are not necessary to limit the technical features of the present invention. This will not be repeated here.

In summary, the present invention provides an inductive structure that combines U-shaped and I-shaped magnetic cores to make the choke coil more mirror-symmetrically wound around the two arms of the U-shaped magnetic core, resulting in an inductive magnetic circuit. Symmetrical. The pre-wound coil group can be directly sleeved on the two arms of the U-shaped magnetic core, and there is no need to reserve the space for the hook pull wire, and the wire winding utilization rate is high, which is advantageous for reducing the volume of the overall inductor structure. In addition, the inductive structure of the present case is combined with the U-type and I-type magnetic cores, so that the interleaved PFC design is integrated, instead of being formed by a two-piece double-ring structure, thereby facilitating the miniaturization of the overall structure and improving the structure. Density and Space utilization. When the type I core is made of a high magnetic permeability material, in addition to helping to improve the light load efficiency and reduce the core loss, the material cost can be reduced.

This case has been modified by people who are familiar with the technology, but it is not intended to be protected by the scope of the patent application.

1a‧‧‧Inductive structure

10‧‧‧First core

11‧‧‧ first surface

12‧‧‧ second surface

20‧‧‧second core

21‧‧‧First connection

22, 23‧‧‧ first arm

30‧‧‧First coil set

31‧‧‧ first opening

32‧‧‧Guide end

40‧‧‧Substrate

41‧‧‧ hole

50‧‧‧Three core

51‧‧‧Second connection

52, 53‧‧‧ second arm

60‧‧‧second coil set

61‧‧‧second opening

62‧‧‧Guide end

Claims (18)

An inductive structure includes: a first magnetic core having a first surface; a second magnetic core having two arms and a connecting portion, wherein the connecting portion is opposite to the first surface of the first magnetic core, Connected between the two arms, and connected to the first surface of the first magnetic core through the two arms respectively; and at least one coil group having two openings respectively corresponding to the two cores of the second magnetic core An arm is disposed on the two arms through the two openings. The inductive structure of claim 1, wherein the first magnetic core is an I-type magnetic core, and the second magnetic core is a U-shaped magnetic core. The inductive structure of claim 1, wherein the first magnetic core and the second magnetic core have the same magnetic permeability. The inductive structure of claim 1, wherein the connecting portion of the second magnetic core has the same thickness as the two arms and the first magnetic core. The inductive structure of claim 1, wherein the at least one coil assembly is pre-formed to structure the two openings. The inductive structure of claim 1, further comprising a substrate, wherein the first magnetic core, the second magnetic core and the at least one coil group are disposed on the substrate, and the at least one coil group has at least two leads The end is disposed on the substrate. An inductive structure includes: a first magnetic core having a first surface and a second surface, wherein the first surface and the second surface are opposite to each other; a second magnetic core having two first arms and a first connecting portion, wherein the first connecting portion is opposite to the first surface of the first magnetic core, and is connected between the two first arms, and respectively Connecting to the first surface of the first magnetic core through the two first arms; a third magnetic core having two second arms and a second connecting portion, wherein the second connecting portion is opposite to the first magnetic portion The second surface of the core is connected between the two second arms, and is respectively connected to the second surface of the first magnetic core through the two second arms; at least one first coil group has two An opening corresponding to the two first arms disposed on the second core; and at least one second coil group having two second openings respectively corresponding to the second and second sleeves of the third core Arm. The inductive structure of claim 7, wherein the first magnetic core is an I-type magnetic core, and the second magnetic core and the third magnetic core are a U-shaped magnetic core. The inductive structure of claim 7, further comprising a substrate, wherein the first magnetic core, the second magnetic core, the third magnetic core, the at least one first coil and the at least one second coil group are disposed on And the at least one first coil and the at least one second coil group respectively have at least two guiding ends disposed on the substrate. The inductive structure of claim 7, wherein the first coil set and the second coil set are pre-formed to frame the first opening and the second opening, respectively. The inductive structure of claim 7, wherein the first magnetic core has the same magnetic permeability as the third magnetic core. The inductive structure of claim 11, wherein the first connecting portion of the second magnetic core has the same thickness as the first arm, the second connecting portion of the third magnetic core, and the second arm . The inductive structure of claim 12, wherein the thickness of the first magnetic core is the thickness of the first connecting portion of the second magnetic core, the thickness of the first arm, and the third magnetic core The thickness of the two joints is twice the thickness of the second arm. The inductive structure of claim 12, wherein the thickness of the first magnetic core and the thickness of the first connecting portion of the second magnetic core, the thickness of the first arm, and the third magnetic core are respectively The thickness of the two connecting portions is the same as the thickness of the second arm. The inductive structure of claim 7, wherein the second magnetic core and the third magnetic core have the same magnetic permeability and less than the magnetic permeability of the first magnetic core. The inductive structure of claim 15, wherein the first connecting portion of the second magnetic core has the same thickness as the first arm, the second connecting portion of the third magnetic core, and the second arm And greater than the thickness of the first core. The inductive structure of claim 15, wherein the first connecting portion of the second magnetic core has the same thickness as the first arm, the second connecting portion of the third magnetic core, and the second arm And greater than one-half of the thickness of the first core. The inductive structure of claim 7, wherein the inductive structure is an interleaved power factor correction inductor.