Symmetrical Coupled Inductors
The symmetrical coupled inductor addresses the challenge of low energy consumption and high power density by optimizing iron core and coil configurations, achieving efficient noise filtering and reduced magnetic flux leakage.
Patent Information
- Application Number
- JP2025004156U
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-12-02
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-12-02
AI Technical Summary
Existing inductor designs face challenges in achieving low energy consumption and meeting structural needs for applications requiring high power density and efficient noise filtering.
A symmetrical coupled inductor structure is designed with specific iron cores and coils configurations, including air gaps and L-shaped extensions, to enhance magnetic coupling and reduce energy losses.
The symmetrical coupled inductor achieves high power density, low energy consumption, and effective noise filtering with reduced magnetic flux leakage and volume, while maintaining a high coupling coefficient.
Smart Images
Figure 0003254627000001_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to an inductor structure, and more particularly to a coupled inductor having a symmetrical structure. [Background technology]
[0002] Inductors have the functions of noise filtering, suppressing instantaneous current, reducing EMI, and converting power, etc. Inductors have a wide range of applications and are used in electronic technology fields such as transformers, energy storage, sensors, induction motors, filters, and electromagnetic relays.
[0003] How to improve the structural design to make the inductor element have the characteristics of low energy consumption and meet the usage needs is a very important subject for those skilled in the art. Summary of the Invention
[0004] To solve the above technical problems, the technical solution adopted by the present invention provides a symmetrical coupled inductor. The symmetrical coupled inductor includes a first iron core, a second iron core, a first coil, and a second coil. The first iron core includes a first body, first and second pillars, the first and second pillars being located on the first body, with a first gap between the first and second pillars. The second iron core is arranged to correspond to the first iron core, and includes a second body, third and fourth pillars, the third and fourth pillars being located on the second body, with a second gap between the third and fourth pillars. The first pillar is adjacent to the third pillar, with a first air gap between the first and third pillars, and the second pillar is adjacent to the fourth pillar, with a second air gap between the second and fourth pillars. The first coil is mounted on the first body of the first core and includes a first arch portion and a first L-shaped extension portion connected to each other. The first arch portion has a first lead, and the first L-shaped extension portion has a second lead. The first arch portion surrounds the first pillar, the first lead extends in a first direction, the first L-shaped extension portion is located below the second pillar, and the second lead extends in the first direction. The second coil is mounted on the second body of the second core and includes a second arch portion and a second L-shaped extension portion connected to each other. The second arch portion has a third lead, and the second L-shaped extension portion has a fourth lead. The second arch portion surrounds the fourth pillar, the third lead extends in the first direction, the second L-shaped extension portion is located below the third pillar, and the fourth lead extends in the first direction. [Brief explanation of the drawings]
[0005] [Figure 1] 1 is a schematic diagram of a symmetrical coupled inductor according to an embodiment of the present invention; [Figure 2] FIG. 2 is a top view of the embodiment shown in FIG. [Figure 3] FIG. 2 is a bottom view of the embodiment shown in FIG. [Figure 4] 2 is an exploded schematic view of a first iron core and a first coil of the embodiment shown in FIG. 1. [Figure 5] 2 is an assembly schematic diagram of a first core and a first coil of the embodiment shown in FIG. 1. FIG. [Figure 6]2 is an exploded schematic view of a second core and a second coil of the embodiment shown in FIG. 1. FIG. [Figure 7] 2 is an assembly schematic diagram of a second core and a second coil of the embodiment shown in FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION
[0006] 1 to 7, FIG. 1 is a three-dimensional schematic diagram of a symmetrical coupled inductor Z according to an embodiment of the present invention, FIG. 2 is a top view of the embodiment shown in FIG. 1, FIG. 3 is a bottom view of the embodiment shown in FIG. 1, FIG. 4 is an exploded schematic diagram of the first iron core 1 and the first coil 3 of the embodiment shown in FIG. 1, FIG. 5 is an assembled schematic diagram of the first iron core 1 and the first coil 3 of the embodiment shown in FIG. 1, FIG. 6 is an exploded schematic diagram of the second iron core 2 and the second coil 4 of the embodiment shown in FIG. 1, and FIG. 7 is an assembled schematic diagram of the second iron core 2 and the second coil 4 of the embodiment shown in FIG. 1.
[0007] As shown in FIG. 1, the symmetrical coupled inductor Z includes a first core 1, a second core 2, a first coil 3 and a second coil 4.
[0008] The first core 1 includes a first body 10, a first columnar body 11, and a second columnar body 12, and the first columnar body 11 and the second columnar body 12 are located in the first body 10, with a first gap W1 between the first columnar body 11 and the second columnar body 12. The second core 2 is provided to correspond to the first core 1, and includes a second body 20, a third columnar body 21, and a fourth columnar body 22, and the third columnar body 21 and the fourth columnar body 22 are located in the second body 20, with a second gap W2 between the third columnar body 21 and the fourth columnar body 22. The first columnar body 11 is adjacent to the third columnar body 21, and a first air gap G1 is located between the first columnar body 11 and the third columnar body 21. The second columnar body 12 is adjacent to the fourth columnar body 22, and a second air gap G2 is formed between the second columnar body 12 and the fourth columnar body 22. The first coil 3 is provided on the first body 10 of the first core 1 and includes a first arch portion 31 and a first L-shaped extension portion 32 that are connected to each other. The first arch portion 31 has a first lead 3111, and the first L-shaped extension portion 32 has a second lead 322. The first arch portion 31 surrounds the first columnar body 11, and the first lead 3111 extends in the first direction D1. The first L-shaped extension portion 32 is located below the second columnar body 12, and the second lead 322 extends in the first direction D1. The second coil 4 is provided on the second body 20 of the second core 2 and includes a second arch portion 41 and a second L-shaped extension portion 42 that are connected to each other. The second arch portion 41 has a third lead 4111, and the second L-shaped extension portion 42 has a fourth lead 422. The second arch portion 41 surrounds the fourth columnar body 22, and the third lead 4111 extends in the first direction D1. The second L-shaped extension portion 42 is located below the third columnar body 21, and the fourth lead 422 extends in the first direction D1.
[0009] In this embodiment, first columnar body 11, second columnar body 12, third columnar body 21, and fourth columnar body 22 are rectangular parallelepipeds and have the same shape. However, in some embodiments, first columnar body 11, second columnar body 12, third columnar body 21, and fourth columnar body 22 may be cylindrical and are not limited to rectangular parallelepipeds. Preferably, length L1 of the rectangular parallelepiped in first direction D1 is 2.5 mm to 3.0 mm, and length L2 of the rectangular parallelepiped in second direction D2 perpendicular to first direction D1 is 2.5 mm to 3.5 mm.
[0010] As shown in Figures 1, 5 and 7, the first lead 3111 protrudes from the first body 10, the second lead 322 protrudes from the first body 10, the third lead 4111 protrudes from the second body 20, and the fourth lead 422 protrudes from the second body 20.
[0011] Furthermore, the first arch portion 31 includes a first side arm portion 311, a first connecting portion 312, and a second side arm portion 313 of the first lead 3111. The first side arm portion 311 is located on a side surface of the first columnar body 11, the first connecting portion 312 is located on the top surface of the first columnar body 11, and the second side arm portion 313 is located on another side surface of the first columnar body 11. The first L-shaped extension portion 32 further includes a first straight portion 321 located on the bottom surface of the second columnar body 12, and both ends of the first straight portion 321 are connected to the second side arm portion 313 and the second lead 322, respectively.
[0012] Furthermore, the second arch portion 41 includes a third side arm portion 411, a second connecting portion 412, and a fourth side arm portion 413 of a third lead 4111. The third side arm portion 411 is located on a side surface of the fourth columnar body 22, the second connecting portion 412 is located on the top surface of the fourth columnar body 22, and the fourth side arm portion 413 is located on another side surface of the fourth columnar body 22. The second L-shaped extension portion 42 further includes a second straight portion 421 located on the bottom surface of the third columnar body 22, and both ends of the second straight portion 421 are connected to the fourth side arm portion 413 and the fourth lead 422, respectively.
[0013] 1, in the first coil 3, the first side arm portion 311 protrudes from the first body 10 along the second direction D2, and the first straight portion 321 protrudes from the first body 10 along the second direction D2 (see FIG. 5). In the second coil 4, the third side arm portion 411 protrudes from the second body 20 along the second direction D2, and the second straight portion 421 protrudes from the second body 20 along the second direction D2 (see FIG. 7).
[0014] The lower ends of the first lead 3111 and the second lead 322 are located at the same position in the first direction D1. The lower ends of the third lead 4111 and the fourth lead 422 are located at the same position. According to the embodiment shown in FIG. 1, the lower ends of the first lead 3111, the second lead 322, the third lead 4111, and the fourth lead 422 are located at the same position in the first direction D1, but the present invention is not limited thereto. The lower ends of the first lead 3111 and the second lead 322 may be located at different positions, and the lower ends of the third lead 4111 and the fourth lead 422 may also be located at different positions. In other words, the user determines the lengths of these leads in the first direction D1 as needed.
[0015] Referring again to FIG. 3, the dimensional relationships in several embodiments of the present invention are described. The length of the rectangular parallelepiped in the first direction D1 is 2.9 mm, and the length in the second direction D2 is 3.0 mm (see FIG. 1). The first air gap G1 between the first columnar member 11 and the third columnar member 21 is 0.01 mm to 0.05 mm (corresponding to the second air gap G2 between the second columnar member 12 and the fourth columnar member 22). The length L3 of the first body 10 and the second body 20 in the second direction D2 is 7.1 mm, and the width W3 in the third direction D3 (perpendicular to the second direction D2) is 1.7 mm. The distance W4 between the first lead 3111 and the fourth lead 422 is 3 mm (see FIG. 1). The width W5 of the first coil 3 (or the second coil 4) in the third direction D3 is 1.2 mm. The length L4 of the columnar body corresponding to each protrusion in the second direction D2 of the lead is 0.7 mm. In some embodiments, the leakage inductance is 10 nH to 50 nH, the mutual inductance is 150 nH to 500 nH, and the coupling coefficient is 0.5 to 0.99. The symmetrical coupled inductor Z of these embodiments can be applied to devices such as transformers, inductors, and switching power supplies, and can maintain low energy losses (e.g., iron losses).
[0016] One of the beneficial effects of the present invention is that the symmetrical coupled inductor of the embodiment can achieve the technical effects of high power density and low energy consumption.
[0017] Another beneficial effect of the present invention is that the structure and installation of the symmetric coupled inductors can achieve the technical effect of anti-coupling.
[0018] According to some embodiments, the symmetric coupled inductor of the present invention can be applied on multiple magnetic paths.
[0019] Furthermore, the symmetric coupled inductors of the present invention can cancel out magnetic fluxes, thereby reducing the overall volume of the inductor structure.
[0020] Furthermore, the symmetrical coupled inductor of this invention achieves a very high coupling coefficient between the two coupled inductors through a rational magnetic path design, allowing them to influence each other.The air gap design between the first and second iron cores achieves the technical effects of high voltage resistance and low energy consumption. [Explanation of symbols]
[0021] Z: symmetric coupled inductor 1: First core 10: First body 11: 1st columnar body 12:Second columnar body 2: Second core 20: Second body 21:Third columnar body 22: 4th columnar body 3: First coil 31: First arch part 311: First side arm 3111: 1st lead 312: First connection part 313: Second side arm 32: 1st L-shaped extension part 321: First straight section 322: Second Lead 4: Second coil 41: Second arch part 411: Third Side Arm 4111: Third Lead 412: Second connection part 413: 4th Side Arm 42: 2nd L-shaped extension part 421: Second straight section 422: 4th lead D1: 1st direction D2:Second direction D3: Third direction W1: First interval W2: Second interval W3:Width W4: Distance W5: Width G1: First air gap G2: Second air gap L1~L4: Length
Claims
1. a first core including a first body, a first columnar body, and a second columnar body, the first columnar body and the second columnar body being located on the first body, and a first gap being defined between the first columnar body and the second columnar body; a second core provided to correspond to the first core and including a second body, a third columnar body, and a fourth columnar body, wherein the third columnar body and the fourth columnar body are located in the second body, a second gap is defined between the third columnar body and the fourth columnar body, the first columnar body is adjacent to the third columnar body, a first air gap is defined between the first columnar body and the third columnar body, and the second columnar body is adjacent to the fourth columnar body, and a second air gap is defined between the second columnar body and the fourth columnar body; a first coil provided on the first body of the first iron core, the first coil including a first arch portion and a first L-shaped extension portion connected to each other, the first arch portion having a first lead, the first L-shaped extension portion having a second lead, the first arch portion surrounding the first pillar-shaped body, the first lead extending in a first direction, the first L-shaped extension portion being located below the second pillar-shaped body, and the second lead extending in the first direction; a second coil provided on the second body of the second iron core and including a second arch portion and a second L-shaped extension portion connected to each other, the second arch portion having a third lead, the second L-shaped extension portion having a fourth lead, the second arch portion surrounding the fourth columnar body, the third lead extending in the first direction, the second L-shaped extension portion being located below the third columnar body, and the fourth lead extending in the first direction.
2. The symmetrical coupled inductor according to claim 1 , wherein the first columnar body, the second columnar body, the third columnar body, and the fourth columnar body are rectangular parallelepipeds and have the same shape.
3. The symmetrical coupled inductor of claim 1 , wherein the first lead protrudes from the first body and the second lead protrudes from the first body.
4. The symmetrical coupled inductor of claim 1 , wherein the third lead protrudes from the second body and the fourth lead protrudes from the second body.
5. the first arch portion includes a first side arm portion, a first connection portion, and a second side arm portion of the first lead; the first side arm portion is located on a side surface of the first pillar, the first connection portion is located on a top surface of the first pillar, and the second side arm portion is located on another side surface of the first pillar, 2. The symmetrical coupled inductor according to claim 1, wherein the first L-shaped extension portion further includes a first straight portion located on a bottom surface of the second columnar body, and both ends of the first straight portion are connected to the second side arm portion and the second lead, respectively.
6. 6. The symmetrical coupled inductor of claim 5, wherein the first side arm portion protrudes from the first body along a second direction perpendicular to the first direction, and the first straight portion protrudes from the first body along the second direction.
7. the second arch portion includes a third side arm portion, a second connection portion, and a fourth side arm portion of the third lead; the third side arm portion is located on a side surface of the fourth pillar, the second connection portion is located on a top surface of the fourth pillar, and the fourth side arm portion is located on another side surface of the fourth pillar, 2. The symmetrical coupled inductor according to claim 1, wherein the second L-shaped extension portion further includes a second straight portion located on a bottom surface of the third columnar body, and both ends of the second straight portion are connected to the fourth side arm portion and the fourth lead, respectively.
8. 8. The symmetrical coupled inductor of claim 7, wherein the third side arm portion protrudes from the second body along a second direction perpendicular to the first direction, and the second straight portion protrudes from the second body along the second direction.
9. The symmetrical coupled inductor according to claim 1 , wherein a bottom end of the first lead and a bottom end of the second lead are at the same or different positions in the first direction.
10. The symmetrical coupled inductor according to claim 1 , wherein a bottom end of the third lead and a bottom end of the fourth lead are at the same or different positions in the first direction.