Large-current coupling inductor

Abstract

The embodiment of the utility model discloses a heavy current coupling inductor which comprises a magnetic core and a coil, the coil comprises a first winding and a second winding, each of the first winding and the second winding comprises a body and a pin connected with the body, the magnetic core is provided with a containing cavity, the bodies are wound in the containing cavity in the circumferential direction, and the pins are wound in the containing cavity in the circumferential direction. The distance between the first winding and the second winding is shortened, magnetic leakage is reduced, the coupling coefficient is improved, the length of a magnetic circuit is shortened, under the same size condition and the same inductance value condition, the number of turns of the coil can be reduced, the DCR can be reduced, meanwhile, the copper consumption can be reduced, the cost can be reduced, the size of the inductor is the most compact, and the power density is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of inductance, in particular to a large current coupled inductor. Background Art

[0002] At present, high efficiency, energy saving and environmental protection have become the development direction of the electronics industry, and small size, low radiation and high power density design have become the mainstream design in the market. Since the technology of semiconductors such as gallium nitride and silicon carbide can greatly increase the switching frequency of the power supply and reduce losses, the product size can be further compressed. While the frequency is increased, the inductor needs a smaller inductance value to meet the design requirements. In this way, a lower DCR (direct current resistance) can be achieved by reducing the number of turns of the winding to meet the requirements of high-power design. The coupled inductor is composed of two windings and is a key component in multi-phase regulators such as SEPIC, ZETA or CuK converters. The two inductors can each bear half of the ripple, thereby reducing the inductor quantity requirement by half. Compared with using two separate power inductors, the coupled dual inductor is smaller in size, thereby saving board space.

[0003] In actual use, the existing coupled inductor is to spirally wind the two windings. This winding method increases the distance between the two windings, thereby affecting the coupling coefficient. Utility Model Content

[0004] Based on this, it is necessary to provide a large current coupled inductor to solve the technical problem that the existing coupled inductor, when actually used, is to spirally wind the two coils, which increases the distance between the two coils and thus affects the coupling coefficient.

[0005] The utility model provides a large current coupled inductor, which comprises a magnetic core and a coil, wherein the coil comprises a first winding and a second winding, wherein the first winding and the second winding both comprise a body and pins connected to the body, wherein the magnetic core has a receiving cavity, and the body is circumferentially wound in the receiving cavity.

[0006] In one embodiment, the magnetic core further has a lead groove communicating with the accommodating cavity, the body is installed in the accommodating cavity, and the pin can be led out from the lead groove and used for external electrical connection.

[0007] In one embodiment, the magnetic core is provided with a middle column, the middle column is connected to the wall of the accommodating cavity, the first winding and the second winding are both provided with an inner hole, and the middle column passes through the inner hole.

[0008] In one embodiment, the large current coupled inductor further includes a base, the base is provided with a lead hole, the base is connected to the magnetic core and covers a portion of the lead groove, and the pin passes through the lead hole.

[0009] In one embodiment, the base includes a base body and a positioning member connected to the base body, and the positioning member is used to position the pin.

[0010] In one embodiment, the base further includes a tin-penetrating boss, which is connected to the base body and is used to provide a tin creeping distance.

[0011] In one embodiment, the tin-penetrating bosses are provided in plurality and are arranged at the four corners of the seat body.

[0012] In one embodiment, the body is flat.

[0013] In one embodiment, the magnetic core is a structural member made of soft saturation magnetic core material.

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

[0015] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0016] The utility model adopts a large current coupled inductor, the coil of which includes a first winding and a second winding, the first winding and the second winding both include a body and a pin connected to the body, the magnetic core has a receiving cavity, the body is circumferentially wound in the receiving cavity, so that the distance between the first winding and the second winding is reduced, the magnetic leakage is reduced, the coupling coefficient is improved, the magnetic path length is shortened, and the inductance value is also improved under the same volume condition. Under the same inductance value condition, the number of turns of the coil can be reduced, the DCR can be reduced, and the copper usage can be reduced, the cost can be reduced, the volume of the inductor is made the most compact, and the power density is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] in:

[0019] Figure 1 FIG. 4 is an isometric diagram of a high current coupled inductor according to an embodiment.

[0020] Figure 2 for Figure 1 Exploded schematic of a high current coupled inductor shown.

[0021] Figure 3 for Figure 2 Schematic diagram of the base in the high current coupled inductor shown.

[0022] Reference numerals:

[0023] 1. Magnetic core; 11. Accommodating cavity; 12. Lead groove; 13. Middle column;

[0024] 2. Coil; 21. First winding; 211. Body; 212. Pin; 214. Inner hole; 22. Second winding;

[0025] 3. Base; 31. Lead hole; 32. Base body; 33. Positioning piece; 34. Tin-through boss. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0029] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0030] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0031] Please combine Figures 1 to 3, the large current coupled inductor provided by the utility model is now described.

[0032] The high current coupled inductor includes a magnetic core 1 and a coil 2. The coil 2 includes a first winding 21 and a second winding 22. The first winding 21 and the second winding 22 both include a body 211 and a pin 212 connected to the body 211. The magnetic core 1 has a receiving cavity 11. The body 211 is circumferentially wound in the receiving cavity 11.

[0033] It can be understood that the coil 2 of the large current coupled inductor includes a first winding 21 and a second winding 22, and the first winding 21 and the second winding 22 both include a body 211 and a pin 212 connected to the body 211. The magnetic core 1 has a receiving cavity 11, and the body 211 is circumferentially wound in the receiving cavity 11, so that the distance between the first winding 21 and the second winding 22 is reduced, the magnetic leakage is reduced, the coupling coefficient is improved, and the length of the magnetic circuit is shortened. Under the same volume conditions, the inductance value is also improved. Under the same inductance value conditions, the number of turns of the coil can be reduced, the DCR can be reduced, and the copper usage can be reduced, and the cost can be reduced. The volume of the inductor is made the most compact and the power density is higher.

[0034] It should be noted that the first winding 21 and the second winding 22 may be self-adhesive wires (small volume inductors) or non-self-adhesive wires (large volume inductors).

[0035] It should be added that the magnetic core 1 is a split configuration. Specifically, the magnetic core 1 includes a first magnet and a second magnet, and the first magnet and the second magnet enclose the accommodating cavity 11. The split configuration of the magnetic core 1 can facilitate the installation of the coil 2.

[0036] In this embodiment, the magnetic core 1 also has a lead groove 12 connected to the accommodating cavity 11, the body 211 is installed in the accommodating cavity 11, and the pin 212 can be led out from the lead groove 12 and used for external electrical connection. In the prior art, after the pin 212 is soldered to the terminal, the terminal is bent and then electrically connected to the external circuit board. There is a risk of open welding between the terminal and the pin 212 during the bending process. Therefore, the pin 212 is led out from the lead groove 12, and can be directly used as an electrode to be electrically connected to the external circuit board, avoiding the risk of open welding.

[0037] In one embodiment, if Figure 2 As shown, the magnetic core 1 is provided with a middle column 13, which is connected to the wall of the accommodating cavity 11, and the first winding 21 and the second winding 22 are both provided with an inner hole 214, and the middle column 13 penetrates the inner hole 214. By providing the middle column 13, the positions of the first winding 21 and the second winding 22 in the accommodating cavity 11 can be positioned, thereby facilitating the installation of the first winding 21 and the second winding 22.

[0038] In this embodiment, the inner holes 214 of the first winding 21 and the second winding 22 may be rectangular, elliptical or polygonal.

[0039] In one embodiment, if Figure 1 and Figure 2 As shown, the high current coupled inductor also includes a base 3, the base 3 is provided with a lead hole 31, the base 3 is connected to the magnetic core 1, and covers part of the lead slot 12, and the pin 212 passes through the lead hole 31. By providing the base 3, the base 3 can cover part of the lead slot 12, and the pin 212 passes through the lead hole 31, thereby achieving a fully enclosed magnetic shielding design, effectively preventing the magnetic field from radiating outward, and increasing the EMC (electromagnetic compatibility) effect.

[0040] In one embodiment, if Figure 2 and Figure 3 As shown, the base 3 includes a base body 32 and a positioning member 33 connected to the base body 32, and the positioning member 33 is used to position the pin 212. Since the first winding 21 and the second winding 22 respectively have two pins 212, in order to facilitate the pins 212 to pass through the lead hole 31, the positioning member 33 is provided to position the distance between the two pins 212.

[0041] In one embodiment, if Figure 2 As shown, the base 3 also includes a tin-penetrating boss 34, which is connected to the base body 32 and is used to provide a tin creeping distance. In this way, the soldering tin creeping effect can be improved and the soldering reliability can be enhanced during the connection between the base 3 and the external circuit board.

[0042] In this embodiment, a plurality of tin-penetrating bosses 34 are provided, and are arranged at the four corners of the base body 32. By providing a plurality of tin-penetrating bosses 34, the reliability of the external connection can be further improved.

[0043] In one embodiment, continue as Figure 2 As shown, the body 211 is flat. The coil 2 is wound by vertically winding a flat wire, replacing the traditional I-shaped magnetic core 1 with round enameled wire, and the gaps between layers and turns of the coil 2 are significantly reduced. The same number of turns increases the cross-sectional area of ​​the wire, reduces DCR (direct current resistance), achieves a greater overcurrent capacity, and achieves energy saving and high efficiency.

[0044] Flat wire winding can effectively reduce the high-frequency skin effect and further reduce the copper wire loss caused by high-frequency ripple.

[0045] By winding the flat wire vertically, the coil 2 is arranged neatly and regularly, the inductance values ​​of the first winding 21 and the second winding 22 are balanced, the accuracy is improved, the maximum coupling coefficient can be obtained, the leakage inductance is reduced, and the conversion efficiency is improved. At the same time, the distributed capacitance can be effectively reduced, the cutoff frequency of the inductance is increased, and the operating frequency is further improved.

[0046] In one embodiment, if Figure 1 and Figure 2 As shown, the magnetic core 1 is a structural member made of a soft saturation magnetic core 1 material. In this way, the inductor can withstand a larger current spike impact.

[0047] In this embodiment, the magnetic core 1 is a structural member made of sendust aluminum, iron silicon, iron nickel or iron silicon nickel.

[0048] Of course, in other embodiments, the material of the magnetic core 1 can be selected by combining ferrite and magnetic powder core to adjust the inductance performance to meet various design requirements.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A high current coupled inductor, characterized in that: The large current coupled inductor includes a magnetic core and a coil, the coil includes a first winding and a second winding, the first winding and the second winding both include a body and pins connected to the body, the magnetic core has a receiving cavity, and the body is circumferentially wound in the receiving cavity.

2. The high current coupled inductor according to claim 1, characterized in that: The magnetic core also has a lead groove communicated with the accommodating cavity, the body is installed in the accommodating cavity, the pin can be led out from the lead groove and used for external electrical connection.

3. The high current coupled inductor according to claim 1, characterized in that: The magnetic core is provided with a middle column, and the middle column is connected to the wall surface of the accommodating cavity. The first winding and the second winding are both provided with inner holes, and the middle column passes through the inner holes.

4. The high current coupled inductor according to claim 2, characterized in that: The large current coupled inductor also includes a base, the base is provided with a lead hole, the base is connected to the magnetic core and covers a part of the lead groove, and the pin passes through the lead hole.

5. The high current coupled inductor according to claim 4, characterized in that: The base includes a base body and a positioning member connected to the base body, and the positioning member is used to position the pin.

6. The high current coupled inductor according to claim 5, characterized in that: The base also includes a tin-penetrating boss, which is connected to the base body and is used to provide a tin creeping distance.

7. The high current coupled inductor according to claim 6, characterized in that: The tin-penetrating bosses are provided in plurality and arranged at the four corners of the seat body.

8. The high current coupled inductor according to claim 1, characterized in that: The body is flat.

9. The high current coupled inductor according to claim 1, characterized in that: The magnetic core is a structural member made of soft saturation magnetic core material.

10. The high current coupled inductor according to claim 9, characterized in that: The magnetic core is made of a structure made of aluminum-silicon-iron, iron-silicon, iron-nickel or iron-silicon-nickel.

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