A low coupling TLVR inductor
Patent Information
- Application Number
- CN202522001193.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-17
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-09-17
AI Technical Summary
但是，现有TLVR耦合电感结构会产生过高的耦合系数（一般会超过0.9）进而导致电感的频率特征发生变化，影响电路的正常工作；同时，该结构线圈的分布电容较高，在降低电感对高频信号的阻抗时会影响电感在高频电路中的滤波、储能等性能，初级线圈和次级线圈之间需要考虑绝缘问题，会增加成本和生产难度
本实用新型将第一导体和第二导体中的第一PIN脚、第二PIN脚与第三PIN脚、第四PIN脚设置为反向折弯结构，以减少现有技术中的叠加式TLVR耦合电感叠加式PIN脚的正对面积，进而减少分布电容；同时，第一导体与第二导体之间不需要再额外增设绝缘，进一步降低了生产工艺难度和生产成本；同时，通过设置第一导体与第二导体之间的距离（第一中柱与第二中柱之间的距离，即第二空槽的空间大小）来调整耦合系数，进而精准获得所需的某个低耦合系数。
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Figure CN224720681U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of inductor technology, specifically relating to a low-coupling TLVR inductor. Background Technology
[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.
[0003] As data centers continue to grow their demand for computing power, the power consumption and current requirements of processors in servers are also increasing. TLVR coupled inductors can provide fast transient response, helping to stabilize the power supply output voltage and meet the power supply requirements of high-performance processors.
[0004] Existing TLVR inductors are constructed by stacking primary and secondary coils one on top of the other, then assembling and fixing the two magnetic cores to the coils, with the primary and secondary coils mounted on the same central column. However, the existing TLVR coupled inductor structure produces an excessively high coupling coefficient (typically exceeding 0.9), which alters the inductor's frequency characteristics and affects the normal operation of the circuit. Simultaneously, this structure results in high distributed capacitance of the coils, which can negatively impact the inductor's filtering and energy storage performance in high-frequency circuits when reducing the inductor's impedance to high-frequency signals. Furthermore, insulation between the primary and secondary coils needs to be considered, increasing cost and manufacturing complexity. Utility Model Content
[0005] To address the aforementioned issues, this invention proposes a low-coupling TLVR inductor. By modifying the dimensional parameters of the TLVR inductor, the coupling coefficient is determined, enabling adjustment of the coupling coefficient. This improves the inductor's impedance to high-frequency signals while reducing manufacturing complexity and cost.
[0006] According to some embodiments, the present invention provides a low-coupling TLVR inductor, employing the following technical solution: A low-coupling TLVR inductor includes a first magnetic core, a second magnetic core, and a first conductor and a second conductor disposed between the first magnetic core and the second magnetic core; wherein the first conductor and the second conductor are arranged in a symmetrical structure, the first conductor includes a first pin, a second pin, and a first intermediate portion for connecting the first pin and the second pin, and the second conductor includes a third pin, a fourth pin, and a second intermediate portion for connecting the third pin and the fourth pin; the first pin and the second pin are both bent in the same direction, and opposite to the bending direction of the third pin and the fourth pin.
[0007] As a further technical limitation, the first magnetic core adopts a U-shaped magnetic core structure, including a first side post, a second side post, a first central post, and a second central post; the first central post and the second central post are arranged in the length direction of the inner side surface of the U-shaped magnetic core; a first slot is formed between the first side post and the first central post, a second slot is formed between the first central post and the second central post, and a third slot is formed between the second central post and the second side post.
[0008] Furthermore, the second magnetic core adopts a U-shaped magnetic core structure, including a third side post, a fourth side post, a third central post, and a fourth central post; the third central post and the fourth central post are arranged along the length direction of the inner side surface of the U-shaped magnetic core; a fourth slot is formed between the third side post and the third central post, a fifth slot is formed between the third central post and the fourth central post, and a sixth slot is formed between the fourth central post and the fourth side post.
[0009] Furthermore, the first empty slot matches the fourth empty slot, the second empty slot matches the fifth empty slot, and the third empty slot matches the sixth empty slot.
[0010] Furthermore, the first middle portion near the first PIN is placed in the first slot and the fourth slot; the first middle portion near the second PIN and the second middle portion near the fourth PIN are placed in the second slot and the fifth slot; and the second middle portion near the third PIN is placed in the third slot and the sixth slot.
[0011] Furthermore, the first intermediate part is placed on one side of the first central column and the third central column; the second intermediate part is placed on one side of the second central column and the fourth central column.
[0012] As a further technical limitation, the surfaces of the first PIN, the second PIN, the third PIN, and the fourth PIN are all sequentially electroplated with a nickel layer and a tin layer.
[0013] As a further technical limitation, a third magnetic core, a third conductor, and a fourth conductor are also provided between the first conductor, the second conductor, and the second magnetic core.
[0014] Furthermore, the third magnetic core adopts a U-shaped magnetic core structure, including a fifth side post, a fifth middle post, a sixth middle post and a sixth side post disposed on the first conductor and the second conductor side, and a seventh side post, a seventh middle post, an eighth middle post and an eighth side post disposed on the third conductor and the fourth conductor side.
[0015] Furthermore, the first conductor is placed on the fifth central column, the second conductor is placed on the sixth central column, the third conductor is placed on the seventh central column, and the fourth conductor is placed on the eighth central column.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention sets the first, second, third, and fourth pins of the first and second conductors into a reverse bending structure to reduce the facing area of the superimposed pins of the superimposed TLVR coupled inductor in the prior art, thereby reducing the distributed capacitance. At the same time, no additional insulation is needed between the first and second conductors, further reducing the difficulty and cost of the manufacturing process. In addition, the coupling coefficient can be adjusted by setting the distance between the first and second conductors (the distance between the first and second central pillars, i.e., the size of the second slot), thereby accurately obtaining a certain low coupling coefficient.
[0017] This invention determines the coupling coefficient by modifying the size parameters of the TLVR inductor, thereby achieving adjustable coupling coefficient. This improves the inductor's impedance to high-frequency signals while reducing manufacturing difficulty and cost. Attached Figure Description
[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.
[0019] Figure 1 This is a schematic diagram of a low-coupling TLVR inductor in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the structure of the first conductor and the second conductor in Embodiment 1 of this utility model; Figure 3 This is an exploded structural diagram of a low-coupling TLVR inductor in Embodiment 2 of this utility model; Wherein, 1. First magnetic core; 101. First side post; 102. Second side post; 103. First central post; 104. Second central post; 105. First slot; 106. Second slot; 107. Third slot; 2. Second magnetic core; 201. Third side post; 202. Fourth side post; 203. Third central post; 204. Fourth central post; 205. Fourth slot; 206. Fifth slot; 207. Sixth slot; 3. First conductor; 301. First pin; 302. Second pin; 303. First middle part; 4. Second conductor; 401. Third pin; 402. Fourth pin; 403. Second 5. Middle section; 6. Third magnetic core; 7. Fifth side post; 8. Sixth side post; 9. Fifth central post; 10. Sixth central post; 11. Seventh side post; 12. Eighth side post; 13. Seventh central post; 14. Eighth central post; 15. Seventh empty slot; 16. Eighth empty slot; 17. Ninth empty slot; 18. Tenth empty slot; 19. Eleventh empty slot; 10. Twelfth empty slot; 11. Third empty slot; 12. Third conductor; 13. Fifth pin; 14. Sixth pin; 15. Third middle section; 16. Fourth conductor; 17. Seventh pin; 18. Eighth pin; 19. Fourth middle section. Detailed Implementation
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0021] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0023] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various components or elements of this utility model and do not specifically refer to any component or element in this utility model. They should not be construed as limiting this utility model.
[0024] In this utility model, terms such as "fixed connection," "connected," and "joined" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.
[0025] Example 1 This utility model embodiment introduces a low-coupling TLVR inductor.
[0026] like Figure 1 The low-coupling TLVR inductor shown includes a first magnetic core 1, a second magnetic core 2, and a first conductor 3 and a second conductor 4 disposed between the first magnetic core 1 and the second magnetic core 2; wherein, both the first magnetic core 1 and the second magnetic core 2 are U-shaped magnetic cores.
[0027] like Figure 1 As shown, the first magnetic core 1 includes a first side post 101, a second side post 102, a first central post 103, and a second central post 104. A first slot 105 is formed between the first side post 101 and the first central post 103, a second slot 106 is formed between the first central post 103 and the second central post 104, and a third slot 107 is formed between the second central post 104 and the second side post 102. The second magnetic core 2 includes a third side post 201, a fourth side post 202, a third central post 203, and a fourth central post 204. A fourth slot 205 is formed between the third side post 201 and the third central post 203, a fifth slot 206 is formed between the third central post 203 and the fourth central post 204, and a sixth slot 207 is formed between the fourth central post 204 and the fourth side post 202.
[0028] like Figure 1 and Figure 2 As shown, the first conductor 3 and the second conductor 4 are arranged in a symmetrical structure; specifically: The first conductor 3 includes a first pin 301, a second pin 302, and a first intermediate portion 303 connecting the first pin 301 and the second pin 302; the first pin 301 and the second pin 302 face the same direction; the first conductor 3 is sleeved on the first central post 103 and the third central post 203, the first intermediate portion 303 near the side of the first pin 301 is disposed in the first slot 105 and the fourth slot 205, and the first intermediate portion 303 near the side of the second pin 302 is disposed in the second slot 106 and the fifth slot 206; The second conductor 4 includes a third pin 401, a fourth pin 402, and a second intermediate portion 403 connecting the third pin 401 and the fourth pin 402; the third pin 401 and the fourth pin 402 are oriented in the same direction and opposite to the orientation of the first pin 301 and the second pin 302; the second conductor 4 is sleeved on the second central post 104 and the fourth central post 204, the second intermediate portion 403 near the third pin 401 is disposed in the third slot 107 and the sixth slot 207, and the second intermediate portion 403 near the fourth pin 402 is disposed in the second slot 106 and the fifth slot 206; It should be noted that the first side post 101 and the third side post 201, the first middle post 103 and the third middle post 203, the second middle post 104 and the fourth middle post 204, and the second side post 102 and the fourth side post 202 are all matched in position and size; the first slot 105 and the fourth slot 205, the second slot 106 and the fifth slot 206, and the third slot 107 and the sixth slot 207 are all matched in position and size.
[0029] In this embodiment, the outer surfaces of the first PIN 301, the second PIN 302, the third PIN 401, and the fourth PIN 402 are sequentially electroplated with a nickel layer and a tin layer.
[0030] In this embodiment, the first conductor 3 and the second conductor 4 are primary coils and secondary coils, respectively. The portions of the first conductor 3 and the second conductor 4 that are close to each other are both located in the second slot 106 and the fifth slot 206.
[0031] The bending directions of the first pin 301 and the second pin 302 are the same, and opposite to the bending directions of the third pin 401 and the fourth pin 402; there is a gap between the first conductor 3 and the second conductor 4, which must be greater than 1mm; at the same time, there is a height difference between the top of the first conductor 3 and the second conductor 4 and the top of the first central column 103, the second central column 104, the third central column 203 and the fourth central column 204, so that the top of the first conductor 3 and the second conductor 4 and the top of the first central column 103, the second central column 104, the third central column 203 and the fourth central column 204 form a space for accommodating the epoxy board, so as to facilitate subsequent adsorption and transfer by the equipment.
[0032] It should be noted that, in this embodiment, the bending angles between the first PIN 301, the second PIN 302 and the first intermediate portion 303, and between the third PIN 401, the fourth PIN 402 and the second intermediate portion 403 are all set to 90 degrees and extend to the end of the magnetic core. The first PIN 301, the second PIN 302, the third PIN 401, the fourth PIN 402 and the first magnetic core 1 and the second magnetic core 2 are fixed by dispensing adhesive.
[0033] In this embodiment, the area of the U-shaped magnetic core end is the same as that of the first central column 103 and the second central column 104 to achieve maximum magnetic flux utilization. The coupling coefficient is set between 0.2 and 0.5 to generate sufficient leakage inductance for use as the inductance value of the Lc compensation inductor in the compensation circuit. Alternatively, the coupling coefficient can be determined during the development and design process as needed: the distance between the two central columns is calculated and determined during product development and design to obtain the required coupling coefficient. This embodiment can effectively reduce mutual inductance to obtain a low coupling coefficient and improve leakage inductance. Combined with the compensation circuit, the leakage inductance can be used as the inductance value of the Lc compensation inductor in the compensation circuit, so as to directly affect the transient response of the circuit (such as voltage overshoot, oscillation, response speed, etc.) by influencing the rate of change of current (di / dt) and the characteristics of energy storage and release in the circuit.
[0034] In this embodiment, the first, second, third, and fourth pins of the first and second conductors are configured with a reverse bending structure to reduce the facing area of the superimposed pins of the superimposed TLVR coupled inductor in the prior art, thereby reducing the distributed capacitance. At the same time, no additional insulation is required between the first and second conductors, further reducing the difficulty and cost of the manufacturing process. In addition, the coupling coefficient is adjusted by setting the distance between the first and second conductors (the distance between the first and second central pillars, i.e., the size of the second slot), thereby accurately obtaining a certain low coupling coefficient.
[0035] Example 2 Embodiment 2 of this utility model introduces a low-coupling TLVR inductor.
[0036] Based on Example 1, such as Figure 3 As shown, in this embodiment, a third magnetic core 5, a third conductor 6, and a fourth conductor 7 are provided between the first conductor 3, the second conductor 4, and the second magnetic core 2.
[0037] like Figure 3 As shown, the third magnetic core 5 adopts a U-shaped magnetic core structure, including a fifth side post 501, a sixth side post 502, a fifth central post 503, and a sixth central post 504 disposed near the first magnetic core 1, and a seventh side post 505, an eighth side post 506, a seventh central post 507, and an eighth central post 508 disposed on the side of the second magnetic core 2; the first conductor 3 and the second conductor 4 are arranged in a symmetrical structure; specifically: A seventh slot 509 is formed between the fifth side post 501 and the fifth central post 503; an eighth slot 510 is formed between the fifth central post 503 and the sixth central post 504; a ninth slot 511 is formed between the sixth central post 504 and the sixth side post 502; a tenth slot 512 is formed between the seventh side post 505 and the seventh central post 507; an eleventh slot 513 is formed between the seventh central post 507 and the eighth central post 508; and a twelfth slot 514 is formed between the eighth central post 508 and the eighth side post. The third conductor 6 includes a fifth pin 601, a sixth pin 602, and a third intermediate portion 603 connecting the fifth pin 601 and the sixth pin 602; the fifth pin 601 and the sixth pin 602 face the same direction; the third conductor 6 is sleeved on the seventh central post 507 and the third central post 203, the third intermediate portion 603 near the fifth pin 601 is disposed in the tenth slot 512 and the fourth slot 205, and the third intermediate portion 603 near the sixth pin 602 is disposed in the eleventh slot 513 and the fifth slot 206; The fourth conductor 7 includes a seventh pin 701, an eighth pin 702, and a fourth intermediate portion 703 connecting the seventh pin 701 and the eighth pin 702; the seventh pin 701 and the eighth pin 702 are oriented in the same direction, and are oriented in the opposite direction to the fifth pin 601 and the sixth pin 602; the fourth conductor 7 is sleeved on the eighth central post 508 and the fourth central post 204, the fourth intermediate portion 703 near the seventh pin 701 is disposed in the twelfth slot 514 and the sixth slot 207, and the fourth intermediate portion 703 near the eighth pin 702 is disposed in the eleventh slot 513 and the fifth slot 206; The first conductor 3 is sleeved on the first central post 103 and the fifth central post 503. The first middle part 303 near the first PIN 301 is disposed in the first slot 105 and the seventh slot 509. The first middle part 303 near the second PIN 302 is disposed in the second slot 106 and the eighth slot 510. The second conductor 4 is sleeved on the second central post 104 and the sixth central post 504. The second middle part 403 near the third PIN 401 is disposed in the third slot 107 and the eighth slot 510. The second middle part 403 near the fourth PIN 402 is disposed in the second slot 106 and the ninth slot 511.
[0038] It should be noted that the first side post 101 and the fifth side post 501, the first middle post 103 and the fifth middle post 503, the second middle post 104 and the sixth middle post 504, the second side post 102 and the sixth side post 502, the seventh side post 505 and the third side post 201, the seventh middle post 507 and the third middle post 203, the eighth middle post 508 and the fourth middle post 204, and the eighth side post 506 and the fourth side post 202 are all matched in position and size; the first slot 105 and the seventh slot 509, the second slot 106 and the eighth slot 510, the third slot 107 and the ninth slot 511, the fourth slot 205 and the tenth slot 512, the fifth slot 206 and the eleventh slot 513, and the sixth slot 207 and the twelfth slot 514 are all matched in position and size.
[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
[0040] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.
Claims
1. A low-coupling TLVR inductor, characterized in that, The device includes a first magnetic core, a second magnetic core, and a first conductor and a second conductor disposed between the first magnetic core and the second magnetic core; wherein the first conductor and the second conductor are arranged in a symmetrical structure, the first conductor includes a first pin, a second pin, and a first intermediate portion for connecting the first pin and the second pin, and the second conductor includes a third pin, a fourth pin, and a second intermediate portion for connecting the third pin and the fourth pin; the first pin and the second pin are both bent in the same direction, and opposite to the bending direction of the third pin and the fourth pin.
2. The low-coupling TLVR inductor as described in claim 1, characterized in that, The first magnetic core adopts a U-shaped magnetic core structure, including a first side post, a second side post, a first middle post, and a second middle post; the first middle post and the second middle post are arranged in the length direction of the inner side surface of the U-shaped magnetic core; a first slot is formed between the first side post and the first middle post, a second slot is formed between the first middle post and the second middle post, and a third slot is formed between the second middle post and the second side post.
3. A low-coupling TLVR inductor as described in claim 2, characterized in that, The second magnetic core adopts a U-shaped magnetic core structure, including a third side post, a fourth side post, a third middle post, and a fourth middle post; the third middle post and the fourth middle post are arranged along the length direction of the inner side surface of the U-shaped magnetic core; a fourth slot is formed between the third side post and the third middle post, a fifth slot is formed between the third middle post and the fourth middle post, and a sixth slot is formed between the fourth middle post and the fourth side post.
4. A low-coupling TLVR inductor as described in claim 3, characterized in that, The first empty slot matches the fourth empty slot, the second empty slot matches the fifth empty slot, and the third empty slot matches the sixth empty slot.
5. A low-coupling TLVR inductor as described in claim 3, characterized in that, The first middle portion near the first pin is placed in the first slot and the fourth slot; The first middle portion near the second pin and the second middle portion near the fourth pin are placed in the second slot and the fifth slot, and the second middle portion near the third pin is placed in the third slot and the sixth slot.
6. A low-coupling TLVR inductor as described in claim 3, characterized in that, The first intermediate part is placed on one side of the first central column and the third central column; the second intermediate part is placed on one side of the second central column and the fourth central column.
7. A low-coupling TLVR inductor as described in claim 1, characterized in that, The surfaces of the first pin, the second pin, the third pin, and the fourth pin are sequentially electroplated with a nickel layer and a tin layer.
8. A low-coupling TLVR inductor as described in claim 1, characterized in that, A third magnetic core, a third conductor, and a fourth conductor are also disposed between the first conductor, the second conductor, and the second magnetic core.
9. A low-coupling TLVR inductor as described in claim 8, characterized in that, The third magnetic core adopts a U-shaped magnetic core structure, including a fifth side post, a fifth middle post, a sixth middle post and a sixth side post disposed on the first conductor and the second conductor side, and a seventh side post, a seventh middle post, an eighth middle post and an eighth side post disposed on the third conductor and the fourth conductor side.
10. A low-coupling TLVR inductor as described in claim 9, characterized in that, The first conductor is placed on the fifth central column, the second conductor is placed on the sixth central column, the third conductor is placed on the seventh central column, and the fourth conductor is placed on the eighth central column.