High-current coupling inductor

Abstract

High-current coupling inductor, characterized in that it comprises a magnetic core and a coil, wherein the coil comprises a first winding and a second winding, and wherein the first winding and the second winding each comprise a base body and a pin connected to the base body, and wherein the magnetic core has a receiving cavity, and wherein the base body is wound circumferentially in the receiving cavity.

Description

TECHNICAL FIELD

[0001] The present utility model relates to the technical field of inductors, in particular a high-current coupling inductor. STATE OF THE ART

[0002] Currently, high efficiency, energy saving, and environmental protection have become the development direction of the electronics industry, and designs with small dimensions, low radiation, and high power density have become the mainstream design in the market. Gallium nitride, silicon carbide, and other semiconductor technologies can significantly improve the switching frequency of power supplies and reduce losses, thereby further compressing product sizes. With increased frequency, the inductor only requires a smaller inductance value to meet design requirements, so by reducing the number of turns of the winding, a lower DCR (DC resistance) can be achieved, meeting the needs of high-power design.The coupling inductor is formed by combining two windings and is a key component in multiphase voltage stabilizers such as SEPIC, ZETA, or CuK converters. The two inductors can each carry half the ripple, reducing the inductance requirement by half. Furthermore, the use of coupled dual inductors saves space on the circuit board due to their smaller size compared to two separate power inductors.

[0003] In the actual use of existing coupling inductors, two windings are wound helically, which increases the distance between the two windings and affects the coupling coefficient. CONTENTS OF THE PRESENT UTILITY MODEL

[0004] Based on this, there is a need to provide a high-current coupling inductor to solve the technical problems that in the actual use of existing coupling inductors, two windings are wound helically, which increases the distance between the two windings and affects the coupling coefficient.

[0005] The present utility model provides a high-current coupling inductor comprising a magnetic core and a coil, wherein the coil comprises a first winding and a second winding, and wherein the first winding and the second winding each comprise a base body and a pin connected to the base body, and wherein the magnetic core has a receiving cavity, and wherein the base body is wound in the receiving cavity in the circumferential direction.

[0006] In one embodiment, the magnetic core further comprises a conduction slot communicating with the receiving cavity, wherein the base body is installed in the receiving cavity, and wherein the pin can be led out of the conduction slot and used for external electrical connection.

[0007] In one embodiment, the magnetic core is provided with a center post connected to the wall surface of the receiving cavity, wherein the first winding and the second winding are each provided with an inner hole, and wherein the center post is passed through the inner hole.

[0008] In one embodiment, the high current coupling inductor further comprises a seat provided with a conduction hole, the seat being connected to the magnetic core and covering a part of the conduction slot, and the pin being passed through the conduction hole.

[0009] In one embodiment, the seat comprises a seat body and a positioning element connected to the seat body, wherein the positioning element is used to position the pin.

[0010] In one embodiment, the seat further comprises a tin-permeable protrusion connected to the seat body to provide a tin climbing clearance.

[0011] In one embodiment, the tin-permeable projections are provided in a number of more than 1 and arranged at four corners of the seat body.

[0012] In one embodiment, the base body has a flat shape.

[0013] In one embodiment, the magnetic core is a structural element consisting of a soft, saturated material of the magnetic core.

[0014] In one embodiment, the magnetic core is a structural element made of iron-silicon-aluminum, iron-silicon, iron-nickel, or iron-silicon-nickel.

[0015] The implementation of the embodiment of the present utility model has the following advantageous effects: A high-current coupling inductor according to the present utility model is used, wherein the coil of the high-current coupling inductor comprises a first winding and a second winding, and wherein the first winding and the second winding each comprise a base body and a pin connected to the base body, and wherein the magnetic core has a receiving cavity, and wherein the base body is wound circumferentially in the receiving cavity in order to reduce the distance between the first winding and the second winding, reduce magnetic leakage, increase the coupling coefficient, shorten the length of the magnetic circuit, increase the inductance value for the same volume, reduce the number of turns of the coil for the same inductance value, reduce the DCR, and simultaneously reduce the amount of copper consumed, and reduce costs.to make the volume of the inductor as compact as possible and achieve a higher power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly explain the technical solutions in the embodiments of the present utility model or in the prior art, the figures to be used in the explanation of the embodiments or the prior art are briefly presented below. Obviously, the figures described below show only some embodiments of the present utility model. A person of ordinary skill in the art can obtain the structures illustrated in these attached drawings without any creative work.

[0017] Below shows: Fig. 1 is an axonometric schematic diagram of a high current coupling inductor in one embodiment; Fig. 2 a schematic exploded view of a high current coupling inductor according to Fig. 1; and Fig. 3 a schematic diagram of a seat of the high current coupling inductor according to Fig. 2. List of reference symbols 1 magnetic core 11 Receiving cavity 12 cable slot 13 center posts 2 coils 21 First winding 211 basic body 212 pen 214 Inner Hole 22 Second winding 3 seats 31 Pipe hole 32 seat bodies 33 Positioning element 34 Tin-permeable projection DETAILED DESCRIPTION

[0018] In conjunction with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model are explained clearly and completely below. Obviously, the explained embodiments do not represent all embodiments, but only a part of the embodiments of the present utility model. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present utility model without creative work should be considered to be covered by the scope of protection of the present utility model.

[0019] It should be noted that similar reference symbols and alphabets do not represent similar elements, if an element is defined in one attached drawing, there is no need to further define and explain the item in further attached drawings.

[0020] It should be noted that in the explanation of the present utility model, the directional or positional relationships with terms such as "top," "bottom," "inside," "outside," etc., are based on the directional or positional relationships shown in the figures, or represent the directional or positional relationships with which the product of the utility model is normally placed. They are provided only to explain the present utility model and to facilitate explanation. They do not show or imply that the illustrated devices or elements have specific directions or should be constructed and operated in specific directions. Therefore, they cannot be understood as limiting the present utility model.

[0021] Furthermore, the terms “the first” and “the second” are used only to explain the purpose and cannot be understood to indicate or imply relative importance.

[0022] It should be noted that the features in the embodiments of the present utility model can be combined with each other in the case of no conflicts.

[0023] In combination with Fig. 1 to 3, a high-current coupling inductor provided by the present utility model is explained.

[0024] The high-current coupling inductor comprises a magnetic core 1 and a coil 2, wherein the coil 2 comprises a first winding 21 and a second winding 22, and wherein the first winding 21 and the second winding 22 each comprise a base body 211 and a pin 212 connected to the base body 211, and wherein the magnetic core 1 has a receiving cavity 11, and wherein the base body 211 is wound in the receiving cavity 11 in the circumferential direction.

[0025] It is understood that the coil 2 of the high-current coupling inductor comprises a first winding 21 and a second winding 22, wherein the first winding 21 and the second winding 22 each comprise a base body 211 and a pin 212 connected to the base body 211, and wherein the magnetic core 1 has a receiving cavity 11, and wherein the base body 211 is wound circumferentially in the receiving cavity 11 in order to reduce the distance between the first winding 21 and the second winding 22, reduce magnetic leakage, increase the coupling coefficient, shorten the length of the magnetic circuit, increase the inductance value for a same volume, reduce the number of turns of the coil for a same inductance value, reduce the DCR, at the same time reduce the consumption amount of copper, reduce costs, make the volume of the inductor as compact as possible, and achieve a higher power density.

[0026] It should be noted that the first winding 21 and the second winding 22 can be both self-adhesive wires (small volume inductor) and non-self-adhesive wires (large volume inductor).

[0027] It should be added that the magnetic core 1 has a split structure. Specifically, the magnetic core 1 includes a first magnet and a second magnet, with the first magnet and the second magnet enclosing the receiving cavity 11. The split configuration of the magnetic core 1 can facilitate the installation of the coil 2.

[0028] In the present embodiment, the magnetic core 1 further includes a lead slot 12 communicating with the receiving cavity 11, the base body 211 is installed in the receiving cavity 11, and the pin 212 can be led out from the lead slot 12 and used for external electrical connection. In the existing technology, after soldering between the pin 212 and the terminal, the terminal is bent and then electrically connected to an external circuit board. During the bending process, there is a risk of welding loosening between the terminal and the pin 212. Therefore, the pin 212 is led out from the lead slot 12 and can be directly used as an electrode for electrical connection to an external circuit board, avoiding the risk of welding loosening.

[0029] In an embodiment, as in Fig. As shown in Figure 2, the magnetic core 1 is provided with a center post 13 connected to the wall surface of the receiving cavity 11, wherein the first winding 21 and the second winding 22 are each provided with an inner hole 214, and wherein the center post 13 is passed through the inner hole 13. With the arrangement of the center post 13, the positions of the first winding 21 and the second winding 22 in the receiving cavity 11 can be fixed to facilitate the installation of the first winding 21 and the second winding 22.

[0030] In the present embodiment, the inner holes 214 of the first winding 21 and the second winding 22 may be rectangular, oval or polygonal.

[0031] In an embodiment, as in Fig. 1 and Fig. 2, the high-current coupling inductor further includes a seat 3 provided with a conduction hole 31, the seat 3 being connected to the magnetic core 1 and covering a part of the conduction slot 12, and the pin 212 being passed through the conduction hole 31. With the arrangement of the seat 3, the seat 3 can cover a part of the conduction slot 12, with the pin 212 being led out of the conduction hole 31 to achieve the construction of a completely closed magnetic shield, which effectively prevents the magnetic field from radiating to the outside and enhances the EMC (electromagnetic compatibility) effect.

[0032] In an embodiment, as in Fig. 2 and Fig. As shown in Figure 3, the seat 3 includes a seat body 32 and a positioning member 33 connected to the seat body 32, wherein the positioning member 33 is used to position the pin 212. Since the first coil 21 and the second coil 22 each have two pins 212, in order to allow the pins 212 to be easily led out of the lead hole 31, a positioning member 33 is arranged to fix the distance between the two pins 212.

[0033] In an embodiment, as in Fig. As shown in Figure 2, the seat 3 further includes a tin-permeable protrusion 34 connected to the seat body 32 to provide a tin climbing clearance. In this way, the welding climbing effect and welding reliability can be improved during the connection process between the seat 3 and the external circuit board.

[0034] In the present embodiment, the tin-permeable protrusions 34 are provided in a number of more than one and arranged at four corners of the seat body 32. With the arrangement of the plurality of tin-permeable protrusions 34, the reliability of the external connection can be further improved.

[0035] In an embodiment, as in Fig. As shown in Figure 2, the base body 211 has a flat shape. Through vertical winding with flat wire, the coil 2 is manufactured by winding, replacing the conventional method of winding the conventional I-magnetic core 1 with round enameled wire, thereby significantly reducing the gap between the layers and the gap between the turns. With the same number of turns, the cross-sectional area of ​​the wire is increased to reduce the DCR (direct current resistance), achieve greater overcurrent capability, and realize energy savings and high efficiency.

[0036] The flat wire winding can effectively reduce the high-frequency skin effect and further reduce the copper wire loss caused by the high-frequency ripple.

[0037] The vertical flat-wire winding allows the coil 2 to be neatly and regularly arranged, the inductance value of the first winding 21 and the second winding 22 is balanced, precision is improved, and the maximum coupling coefficient can be achieved. Leakage inductance is reduced and conversion efficiency is improved. At the same time, the distribution capacitance can be effectively reduced, the cutoff frequency of the inductor can be improved, and the operating frequency can be further increased.

[0038] In an embodiment, as in Fig. 1 and Fig. As shown in Figure 2, the magnetic core 1 is a structural element consisting of a soft, saturated material. This allows the inductor to withstand larger current peaks.

[0039] In the present embodiment, the magnetic core 1 is a structural element made of iron-silicon-aluminum, iron-silicon, iron-nickel or iron-silicon-nickel.

[0040] Of course, in other embodiments, the material of the magnetic core 1 can be selected to combine ferrite and powder magnetic cores to adapt the performance of the inductor to different design requirements.

[0041] The respective technical features of the above embodiments can be combined arbitrarily. To simplify the explanation, not all possible combinations of the respective technical features in the above embodiments are explained. However, the combinations of the technical features shall be considered to be within the scope of the description in the case of no conflicts.

[0042] Only preferred embodiments of the present utility model are disclosed above, of course the scope of the rights of the present utility model may be limited thereto, therefore the equivalent changes made according to the claims of the present utility model should be considered to be covered by the scope of protection of the present utility model.

Claims

[1] High current coupling inductor, characterized by that it comprises a magnetic core and a coil, wherein the coil comprises a first winding and a second winding, and wherein the first winding and the second winding each comprise a base body and a pin connected to the base body, and wherein the magnetic core has a receiving cavity, and wherein the base body is wound circumferentially in the receiving cavity. [2] High-current coupling inductor according to claim 1, characterized by that the magnetic core further comprises a conduction slot communicating with the receiving cavity, wherein the base body is installed in the receiving cavity, and wherein the pin can be led out of the conduction slot and is used for external electrical connection. [3] High-current coupling inductor according to claim 1, characterized bythat the magnetic core is provided with a center post which is connected to the wall surface of the receiving cavity, wherein the first winding and the second winding are each provided with an inner hole, and wherein the center post is passed through the inner hole. [4] High-current coupling inductor according to claim 1, characterized by that the high-current coupling inductor further comprises a seat provided with a conduction hole, the seat being connected to the magnetic core and covering a part of the conduction slot, and the pin being passed through the conduction hole. [5] High-current coupling inductor according to claim 4, characterized by that the seat comprises a seat body and a positioning element connected to the seat body, wherein the positioning element is used to position the pin. [6] High-current coupling inductor according to claim 5, characterized bythat the seat further comprises a tin-permeable projection connected to the seat body to provide a tin climbing clearance. [7] High-current coupling inductor according to claim 6, characterized by that the tin-permeable projections are provided in a number of more than 1 and arranged at four corners of the seat body. [8] High-current coupling inductor according to claim 1, characterized by that the base body has a flat shape. [9] High-current coupling inductor according to claim 1, characterized by that the magnetic core is a structural element consisting of a soft, saturated material of the magnetic core. [10] High-current coupling inductor according to claim 9, characterized by that the magnetic core is a structural element made of iron-silicon-aluminium, iron-silicon, iron-nickel or iron-silicon-nickel.

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