Inductor

Abstract

The utility model provides an inductor which comprises an inductor assembly, an injection molding body and two ceramic cooling fins. The inductor assembly comprises a magnetic core and a coil, the coil is wound on the magnetic core, the coil is fixedly connected with the magnetic core, and the ceramic cooling fin is a hard component; the injection molding body forms an inductor assembly through an injection molding process, the injection molding body is connected with the ceramic cooling fins and the inductor assembly to form an integrated inductor, the outer surfaces of the ceramic cooling fins are exposed out of the injection molding body, and the two ceramic cooling fins are opposite to two side faces of the coil one by one. The inductor assembly and the two ceramic cooling fins are connected into an integrated structure through the injection molding process, the injection molding body formed through injection molding wraps the inductor assembly, the two ceramic cooling fins are exposed out of the two side faces of the injection molding body respectively, and the heat dissipation performance of the inductor can be greatly improved due to the existence of the two ceramic cooling fins; therefore, the wire diameter of the wire rod of the coil and the overall size of the inductor can be greatly reduced, and both the improvement of the heat dissipation performance and the reduction of the product size are considered.

Description

Technical Field

[0001] This utility model relates to the field of inductors, and specifically to an inductor. Background Technology

[0002] Currently, new energy vehicles and hybrid vehicles, characterized by electrification, are gradually replacing traditional gasoline-powered vehicles, becoming one of the important means for countries to address the greenhouse effect. The core of vehicle electrification is to achieve efficient electromechanical coupling through energy storage in power batteries and electric motor drive, thereby saving fuel or eliminating the need for fuel altogether. In the operating mechanism of vehicle electrification, a significant characteristic of charging the battery and discharging the battery to drive the motor is the high-power voltage conversion of high-voltage electrical energy. Therefore, high-power inductors in the conversion circuit become one of its essential core components.

[0003] Currently, high-power inductors used in automobiles typically consist of a coil, a magnetic core, and an insulator. During operation, the coil and magnetic core generate significant heat. To maintain the inductor's normal operation, heat dissipation is usually required. However, existing inductors cannot effectively balance heat dissipation performance and size; the aforementioned issues are technical problems that urgently need to be solved in this field. Utility Model Content

[0004] The main technical problem solved by this invention is to provide an inductor that can balance heat dissipation performance and product size.

[0005] The solution to achieve the technical objective of this utility model is an inductor, comprising:

[0006] An inductor assembly, which includes a magnetic core and a coil, wherein the coil is wound on the magnetic core and the coil is connected and fixed to the magnetic core;

[0007] Two ceramic heat sinks, which are rigid components;

[0008] And the injection molded body, which is formed into an inductor component through injection molding process. The injection molded body connects the ceramic heat sink and the inductor component to form an integrated inductor. The outer surface of the ceramic heat sink is exposed on the injection molded body, and the two ceramic heat sinks are opposite to two sides of the coil.

[0009] In one alternative embodiment, two ceramic heat sinks are arranged opposite each other, and the two ceramic heat sinks are respectively positioned and in contact with the two sides of the coil.

[0010] In one optional embodiment, the thickness of the ceramic heat sink is 0.2mm to 0.5mm, and the outer surfaces of the two ceramic heat sinks are flush with the outer surfaces of the sides of the injection molded body.

[0011] In one optional embodiment, the area of ​​the ceramic heat sink exposed on the injection molded body is S1, and the area of ​​the side of the injection molded body where the ceramic heat sink is located is S2, satisfying S1:S2≥30%.

[0012] In one optional embodiment, on a cross-section perpendicular to the winding axis of the coil, the length dimension of the closed shape formed by the four sides of the injection molded body is L and the thickness dimension is H, satisfying L:H≥3:1; ceramic heat sinks are provided on the side of the injection molded body corresponding to the length dimension L.

[0013] In one alternative embodiment, the two ends of the coil wire extend out of the injection molding body to form two pins for external connection; the magnetic core includes a connecting center core and a connecting core, the coil is wound on the center core, the shape of the center core matches the shape of the coil; the connecting core has a placement cavity for placing the center core and the coil, the placement cavity has an opening opposite to the ceramic heat sink, and the connecting core has a clearance for the pins to pass through.

[0014] In one alternative embodiment, the central core includes at least two first sub-cores, which are arranged sequentially along the winding axis, and each first sub-core is wound with coil wire.

[0015] In one optional embodiment, the coil and the central core are connected as a pre-structure by injection molding. The outer surface of the first sub-core has a drainage groove for the injection molding material to flow in the gap between the first sub-core and the coil. The drainage grooves on two adjacent first sub-cores are connected. The injection molded body connects and fixes the pre-structure, connects the core and the ceramic heat sink.

[0016] In one optional embodiment, the connecting core includes at least two second sub-cores, which are connected end to end to form a placement cavity, and an avoidance portion is provided on at least one of the second sub-cores.

[0017] In one optional embodiment, there are four second sub-cores, each in the shape of a flat plate; two of the second sub-cores are yoke cores, and the remaining two are bypass cores. The two yoke cores are arranged opposite each other along the winding axis of the coil and are respectively connected to both ends of the central core. The two bypass cores are arranged opposite each other and distributed on both sides of the winding axis of the inductor assembly. The inductor assembly is arranged between the four second sub-cores, and both ends of the coil wire extend out of the placement cavity through the corresponding clearance portion.

[0018] According to the inductor of the above embodiment, the inductor component and two ceramic heat sinks are connected into an integral structure through injection molding. The injection-molded body covers the inductor component, and the two ceramic heat sinks are exposed on two sides of the injection-molded body. The ceramic heat sinks are directly used as part of the inductor. When the inductor is applied in scenarios such as automotive inductors, contact heat exchange can be achieved directly through the ceramic heat sinks without the need for additional thermal pads. The thermal conductivity of the ceramic heat sinks is much greater than that of common soft thermal pads such as silicone thermal pads. The presence of two ceramic heat sinks can significantly improve the heat dissipation performance of the inductor, thereby significantly reducing the wire diameter of the coil and the overall size of the inductor. The smaller size of the inductor can reduce the depth of heat transfer, which is conducive to further improving the heat dissipation rate, thus achieving both improved heat dissipation performance and reduced product size. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an inductor provided for some embodiments of the present invention.

[0020] Figure 2 for Figure 1 Exploded view of the inductor in the image.

[0021] Figure 3 for Figure 2 Another perspective illustration.

[0022] Figure 4 for Figure 1 A front view of an inductor.

[0023] Figure 5 for Figure 4 A schematic diagram of AA.

[0024] Figure 6 for Figure 4 A schematic diagram of BB.

[0025] Figure 7 for Figure 1 A schematic diagram of the coil structure in an inductor.

[0026] Figure 8 for Figure 1 A schematic diagram of the prestructure in an inductor.

[0027] Figure 9 for Figure 1 A schematic diagram of the pre-structure, connecting magnetic core, and heat sink in an inductor.

[0028] Reference numerals: 1000-Inductor; 100-Inductor assembly; 110-Magnetic core; 111-Center core; 112-First sub-core; 113-Connecting core; 114-Second sub-core; 115-Yoke core; 116-Bypass core; 117-Allowing section; 120-Coil; 121-Pin; 122-Main body; 123-Extension section; 200-Injection molded body; 300-Ceramic heat sink. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0030] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0031] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0032] To address the issue that existing inductors 1000 cannot simultaneously achieve good heat dissipation performance and a small size, this invention provides an inductor 1000, which includes an inductor assembly 100, two ceramic heat sinks 300, and an injection-molded body 200. Please refer to... Figures 1-7The inductor assembly 100, as the main heat-generating component of the inductor 1000, stores and releases electrical energy through electromagnetic induction generated in the magnetic core 110 by the coil 120. The inductor assembly 100 includes a magnetic core 110 and a coil 120, with the coil 120 wound around the magnetic core 110 and fixedly connected to it. The ceramic heat sink 300 is a rigid component with a thermal conductivity of 20 W / m·K to 250 W / m·K. It also possesses good insulation properties, airtightness, and compressive strength, meeting the requirements for electrical isolation. The injection molded body 200 is formed onto the inductor assembly 100 using an injection molding process. The injection molded body 200 connects the ceramic heat sink 300 and the inductor assembly 100 to form an integrated inductor 1000, thereby ensuring a stable connection and fixation between the ceramic heat sink 300 and the inductor assembly 100. The outer surface of the ceramic heat sink 300 is exposed on the injection molded body 200, and the two ceramic heat sinks 300 are opposite to two sides of the coil 120. The inductor 1000 achieves external connection for heat exchange through the exposed ceramic heat sinks 300. The ceramic heat sink 300 can exchange heat directly with the air, or it can contact external heat exchange equipment, or even directly contact metal for heat dissipation. The presence of the ceramic heat sink 300 can significantly improve the heat dissipation performance of the inductor 1000. With the significantly improved heat dissipation performance of the inductor 1000, a coil 120 with a smaller wire diameter can be selected, thereby effectively reducing the overall size of the inductor 1000 while improving heat dissipation performance, thus achieving a good balance between heat dissipation performance and product size. In addition, by injection molding, the inductor assembly 100 and the ceramic heat sink 300 are connected as a whole, and ceramic heat sinks 300 are respectively provided on two sides of the inductor assembly 100. The two ceramic heat sinks 300 achieve double-sided heat dissipation of the inductor 1000, which is beneficial to improving the heat dissipation effect.

[0033] The aforementioned "two ceramic heat sinks 300 and two sides of the coil 120 are opposite each other" means that there is no injection molding layer between the ceramic heat sink 300 and the coil 120. That is, the heat generated by the inductor component 100 can be directly transferred to the ceramic heat sink 300, and then quickly exchanged with the air or external heat exchange equipment through the ceramic heat sink 300.

[0034] The inductor 1000 according to this technical solution differs from related technologies primarily in that: firstly, the ceramic heat sink 300 is directly integrated into the inductor 1000. When the inductor 1000 is applied in scenarios such as automotive inductors, contact heat exchange can be achieved directly through the ceramic heat sink 300, for example, by placing the ceramic heat sink 300 directly in contact with a water cooler. This differs in composition and structure from the inductors 1000 commonly found in related technologies where part of the coil 120 is directly exposed, eliminating the need for additional thermal pads. Furthermore, the double-sided heat dissipation solution significantly improves the heat dissipation performance of the inductor 1000. On the other hand, this solution uses a rigid ceramic heat sink 300. The thermal conductivity of the ceramic heat sink 300 is much greater than that of common soft thermal pads such as silicone thermal pads, which can significantly improve the heat dissipation performance of the inductor 1000. As a result, the wire diameter of the coil 120 and the overall size of the inductor 1000 can also be significantly reduced. The reduction in the size of the inductor 1000 can reduce the depth of heat transfer, which is conducive to further improving the heat dissipation rate, thus balancing the improvement of heat dissipation performance and the reduction of product size.

[0035] It should be noted that the other sides of the injection-molded body 200 besides the two sides where the ceramic heat sinks 300 are located will also assist in heat dissipation. The inductor 1000 mentioned above includes two ceramic heat sinks 300, which means that it can include at least two ceramic heat sinks 300. In some other embodiments, if there is a higher requirement for the heat dissipation performance of the inductor 1000, more than two ceramic heat sinks 300 can be set. The heat dissipation rate can be further improved by using more than two ceramic heat sinks 300 on different sides. That is, the number of ceramic heat sinks 300 can be adaptively adjusted according to actual needs.

[0036] In addition, the above-mentioned "coil 120 is wound on magnetic core 110" means that in some embodiments, magnetic core 110 may have multiple parts, and coil 120 may be wound on only part of magnetic core 110. In other embodiments, magnetic core 110 may be a complete structure, and coil 120 may be directly wound on the outside of magnetic core 110.

[0037] This invention does not limit the selection of injection molding material or the molding preparation scheme for injection body 200. It can be any material that is feasible in the prior art, such as PPS, PA, PET, etc. It will not be elaborated here. For details, please refer to the relevant technology.

[0038] In some embodiments, please refer to Figure 2 , Figure 3 and Figure 9Two ceramic heat sinks 300 are positioned opposite each other, with each heat sink 300 corresponding to and in contact with one of the two sides of the coil 120. The two ceramic heat sinks 300 clamp the inductor assembly 100, significantly improving the heat dissipation performance of the inductor 1000. This allows for a reduction in wire diameter and a substantial reduction in the size of the inductor 1000. By ensuring direct contact and opposition between the ceramic heat sinks 300 and the sides of the coil 120, sufficient direct contact area is provided between the ceramic heat sinks 300 and the inductor assembly 100, forming a direct contact heat transfer method. The heat generated by the inductor assembly 100 is directly transferred to the ceramic heat sinks 300, and then the ceramic heat sinks transfer heat to the outside environment. This further shortens the heat transfer path, effectively improving heat dissipation performance and also contributing to the overall size control of the inductor 1000.

[0039] In some embodiments, please refer to Figure 5 and Figure 6 The ceramic heat sink 300 has a thickness of 0.2mm to 0.5mm. Due to its excellent insulation and airtightness, the relatively thin ceramic heat sink 300 can still meet the requirements for electrical isolation. Therefore, by controlling the thickness of the ceramic heat sink 300 between 0.2mm and 0.5mm, the dimensions of the inductor 1000 in the thickness direction can be further controlled while ensuring the performance of the inductor 1000, which is beneficial for reducing the overall volume of the inductor 1000. The outer surfaces of the two ceramic heat sinks 300 are flush with the outer surfaces of the sides of the injection molded body 200. By ensuring that the ceramic heat sinks 300 do not protrude from the sides of the injection molded body 200, the dimensions of the inductor 1000 in the thickness direction corresponding to the ceramic heat sink 300 can be controlled, and the length of the heat transfer path can be effectively shortened, thus balancing heat dissipation performance and the volume control of the inductor 1000. In addition, since the outer surface of the ceramic heat sink 300 is flush with the outer surface of the side of the injection molded body 200, the exposed side of the inductor 1000 with the ceramic heat sink 300 is a plane. Therefore, during use, the ceramic heat sink 300 and the side of the injection molded body 200 can simultaneously contact and connect with the external structure. The ceramic heat sink 300 and the injection molded body 200 can simultaneously achieve contact heat exchange with the external structure, which can increase the overall heat exchange area between the inductor 1000 and the external structure.

[0040] In some embodiments, referring to the figures, the area of ​​the ceramic heat sink 300 exposed on the injection molded body 200 is S1, and the area of ​​the side of the injection molded body 200 where the ceramic heat sink 300 is located is S2, satisfying S1:S2≥30%, to further improve the overall heat dissipation performance of the inductor 1000. For example, the percentage of S1:S2 can be 30%, 35%, 38%, 40%, 45%, or 50%, etc.

[0041] In some embodiments, referring to the figures, on a cross-section perpendicular to the winding axis of the coil 120, the length dimension L and the thickness dimension H of the closed shape formed by the four sides of the injection molded body 200 satisfy L:H≥3:1; the ceramic heat sink 300 is disposed on the side of the injection molded body 200 corresponding to the length dimension L, that is, the ceramic heat sink 300 is located on the large surface of the injection molded body 200. In other words, by increasing the length-to-thickness ratio of the entire product, and ensuring that the length-to-thickness ratio is not less than 3, the heat dissipation path to the ceramic heat sink 300 is mainly along the direction of the thickness dimension H of the injection molded body 200, which can further shorten the heat transfer depth of the inductor component 100 and is beneficial to overall heat dissipation. In addition, a larger dimension L of the injection molded body 200 is beneficial to increasing the size of the ceramic heat sink 300, i.e., the exposed heat dissipation area, which is beneficial to further improving the heat dissipation performance of the inductor 1000.

[0042] In some embodiments, referring to the figures, to achieve external electrical connection of the inductor 1000, both ends of the wire of the coil 120 extend outside the injection molded body 200 to form two pins 121 for external connection. Both pins 121 can be located on either side of the injection molded body 200; that is, in different embodiments, the two pins 121 can be located on the same side of the injection molded body 200 or on different sides of the injection molded body 200. Adaptive adjustments can be made according to specific needs, and this invention does not impose specific limitations.

[0043] In some embodiments, referring to the figures, the magnetic core 110 includes a connected central core 111 and a connecting core 113. A coil 120 is wound on the central core 111, and the shape of the central core 111 matches the shape of the coil 120. The connecting core 113 has a placement cavity for placing the central core 111 and the coil 120. The placement cavity has an opening that is opposite to the ceramic heat sink 300. The connecting core 113 has a clearance portion 117 for the pins 121 to pass through. The two ends of the wire of the coil 120 pass through the clearance portion 117 and the injection molded body 200. The magnetic core 110 is divided into a central core 111 and a connecting core 113. The coil 120 is wound only on the central core 111. The connecting core 113 forms a protective frame structure around the central core 111 and the coil 120. This structure not only improves the inductance performance, but also serves as the positioning basis when assembling the inductor assembly 100 with the injection molded body 200. It can also improve the rigidity and compressive strength of the inductor assembly 100 to a certain extent.

[0044] In some embodiments, referring to the figures, the central core 111 includes at least two first sub-cores 112, which are arranged sequentially along the winding axis. Each first sub-core 112 is wound with wire of coil 120 to improve the inductance of the central core 111. For example, in some embodiments, the number of first sub-cores 112 may be three.

[0045] In some embodiments, referring to the figures, the coil 120 and the central core 111 are integrally connected by injection molding to form a pre-structure. The outer surface of the first sub-core 112 has a drainage groove for the injection molding material to flow in the gap between the first sub-core 112 and the coil 120. The drainage grooves on two adjacent first sub-cores 112 are connected to ensure the connection strength between the coil 120 and the central core 111. The injection molded body 200 connects and fixes the pre-structure, connects the core 113 and the ceramic heat sink 300. During the process of obtaining the pre-structure through injection molding, the mold can be used to make the surface of the coil 120 more flat. Therefore, during the molding process of the injection molded body 200, the ceramic heat sink 300 can be pressed tightly against the surface of the coil 120, while effectively avoiding the problem of stress concentration and damage to the ceramic heat sink 300 caused by unevenness or protrusions on the surface of the coil 120.

[0046] In other words, the molding of inductor 1000 involves two injection molding processes. The first injection molding process obtains a pre-structure, ensuring the flatness and smoothness of the outer surface of coil 120. The second injection molding process, which forms injection molded body 200, connects the pre-structure, connecting magnetic core 113, and ceramic heat sink 300 into one unit, resulting in the final inductor 1000. The injection mold ensures that the ceramic heat sink 300 is pressed tightly against the surface of coil 120 and that the ceramic heat sink 300 is not crushed. Furthermore, the ceramic heat sink 300 can be made thinner as needed, shortening the heat transfer depth of inductor component 100 and further improving the heat dissipation performance of inductor 1000. In addition, the injection molding process of the injection body 200 directly forms the connecting magnetic core 113, ceramic heat sink 300 and pre-structured body, which can obtain an integrated inductor 1000 more directly and quickly. It can better make the outer surface of the ceramic heat sink 300 flush with the outer surface of the injection body 200, and the ceramic heat sink 300 and coil 120 can fit more tightly in the resulting product. This can effectively improve the contact degree between the ceramic heat sink 300 and coil 120, thereby effectively improving the heat transfer effect and the stability of the product.

[0047] In some embodiments, referring to the figures, the connecting magnetic core 113 includes at least two second sub-magnetic cores 114. The two second sub-magnetic cores 114 are connected end to end and enclose a placement cavity. A clearance portion 117 is provided on at least one of the second sub-magnetic cores 114. The connecting magnetic core 113 is designed as a split structure, which facilitates the assembly of the connecting magnetic core 113 and the pre-structure. On the other hand, the structure of the second sub-magnetic core 114 is simpler and the performance is better, which is beneficial to the improvement of the inductance performance of the inductor 1000.

[0048] In some embodiments, referring to the figures, there are four second sub-cores 114, each in a flat plate shape. Two of the second sub-cores 114 are yoke cores 115, and the remaining two are bypass cores 116. The two yoke cores 115 are arranged opposite each other along the winding axis of the coil 120 and are respectively connected to both ends of the central core 111. The two bypass cores 116 are arranged opposite each other and distributed on both sides of the winding axis of the inductor assembly 100. The inductor assembly 100 is arranged between the four second sub-cores 114, and both ends of the coil 120 wires extend out of the placement cavity through the corresponding clearance portions 117. All four second sub-cores 114 are flat plates without inflection points or corners, further simplifying the structure of the second sub-cores 114 and contributing to further improvement in the inductance performance of the inductor assembly 100.

[0049] In some embodiments, referring to the figures, the extension direction of pin 121 is consistent with the winding axis of coil 120, and along the winding axis of coil 120, the two pins 121 are located at the same end of coil 120; both yoke cores 115 have clearance portions 117. The coil 120 includes a main body 122 and an extension portion 123 of an integral structure. The main body 122 is formed by winding wire around the central core 111. One end of the wire in the main body 122 is bent toward the adjacent yoke core 115 to pass through the relief portion 117 and extend out of the injection molding body 200, forming one pin 121. The other end of the wire in the main body 122 is bent toward another yoke core 115 to pass through the relief portion 117 and connect to the extension portion 123. The extension portion 123 is U-shaped and is located outside the placement cavity and extends along the outer surface of the bypass core 116. One end of the U-shaped extension portion 123 is connected to the main body 122, and the other end of the U-shaped extension portion 123 is bent to extend out of the injection molding body 200, forming another pin 121. On the one hand, the other end of the wire in the main body 122 is bent multiple times and extended around the yoke core 115 and the bypass core 116, effectively controlling the overall volume of the inductor assembly 100. The yoke core 115 and the bypass core 116 can also provide rigid support for the wire. On the other hand, the two pins 121 are set on the same side of the insulating shell, and the two pins 121 extend in the same direction, which facilitates the inductor 1000 to make external electrical connections.

[0050] In summary, the inductor 1000 provided by this utility model has at least the following beneficial effects:

[0051] The ceramic heat sink 300 is directly integrated into the inductor 1000. When the inductor 1000 is applied in scenarios such as automotive inductors, contact heat exchange can be achieved directly through the ceramic heat sink 300. For example, the ceramic heat sink 300 can be directly in contact with a water cooler. This differs in composition and structure from the inductors 1000 in which the coil 120 is commonly exposed in related technologies, eliminating the need for additional thermal pads. Furthermore, the use of a double-sided heat dissipation solution significantly improves the heat dissipation performance of the inductor 1000. On the other hand, this solution uses a rigid ceramic heat sink 300. The thermal conductivity of the ceramic heat sink 300 is much greater than that of common soft thermal pads such as silicone thermal pads, which can significantly improve the heat dissipation performance of the inductor 1000. As a result, the wire diameter of the coil 120 and the overall size of the inductor 1000 can also be significantly reduced. The reduction in the size of the inductor 1000 can reduce the depth of heat transfer, which is conducive to further improving the heat dissipation rate, thus balancing the improvement of heat dissipation performance and the reduction of product size.

[0052] This solution uses a rigid ceramic heat sink 300, which possesses excellent insulation properties, airtightness, and compressive strength, meeting electrical isolation requirements. The thermal conductivity of the ceramic heat sink 300 ranges from 20 W / m·K to 250 W / m·K, significantly higher than that of common soft thermal pads such as silicone thermal pads. This substantially improves the heat dissipation performance of the inductor 1000, leading to a significant reduction in the wire diameter of the coil 120 and the overall size of the inductor 1000. The reduced size of the inductor 1000 decreases the depth of heat transfer, further enhancing the heat dissipation rate, thus balancing improved heat dissipation performance with reduced product size.

[0053] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. An inductor, characterized in that, include: An inductor assembly, the inductor assembly including a magnetic core and a coil, the coil being wound on the magnetic core and the coil being connected and fixed to the magnetic core; Two ceramic heat sinks, wherein the ceramic heat sinks are rigid components; The inductor assembly is formed by injection molding. The inductor assembly is connected to the ceramic heat sink and the inductor assembly to form an integral inductor. The outer surface of the ceramic heat sink is exposed on the inductor assembly, and the two ceramic heat sinks are opposite to two sides of the coil.

2. The inductor as described in claim 1, characterized in that, The two ceramic heat sinks are arranged opposite each other, and the two ceramic heat sinks are respectively positioned and in contact with the two sides of the coil.

3. The inductor as described in claim 1 or 2, characterized in that, The thickness of the ceramic heat sink is 0.2mm to 0.5mm, and the outer surfaces of the two ceramic heat sinks are flush with the outer surfaces of the side surfaces of the injection molded body.

4. The inductor as described in claim 1 or 2, characterized in that, The area of ​​the ceramic heat sink exposed on the injection molded body is S1, and the area of ​​the side of the injection molded body where the ceramic heat sink is located is S2, satisfying S1:S2≥30%.

5. The inductor as described in claim 2, characterized in that, On a cross-section perpendicular to the winding axis of the coil, the length dimension of the closed shape formed by the four sides of the injection molded body is L and the thickness dimension is H, satisfying L:H≥3:1; the ceramic heat sink is provided on the side of the injection molded body corresponding to the length dimension L.

6. The inductor as described in claim 5, characterized in that, The two ends of the coil wire extend out of the injection molded body to form two pins for external connection; The magnetic core includes a central core and a connecting core, the coil is wound on the central core, and the shape of the central core matches the shape of the coil; the connecting core has a placement cavity for placing the central core and the coil, the placement cavity has an opening, and the opening is opposite to the ceramic heat sink, and the connecting core has a clearance portion for the pin to pass through.

7. The inductor as described in claim 6, characterized in that, The central core includes at least two first sub-cores, which are arranged sequentially along the winding axis, and each first sub-core is wound with the wire of the coil.

8. The inductor as claimed in claim 7, characterized in that, The coil and the central core are connected as a pre-structured body by injection molding. The outer surface of the first sub-core has a drainage groove for the injection molding material to flow in the gap between the first sub-core and the coil. The drainage grooves on two adjacent first sub-cores are connected. The injection molded body connects and fixes the pre-structured body, the connecting core and the ceramic heat sink.

9. The inductor as claimed in claim 6, characterized in that, The connecting magnetic core includes at least two second sub-magnetic cores, which are connected end to end to form the placement cavity, and the clearance portion is provided in at least one of the second sub-magnetic cores.

10. The inductor as claimed in claim 9, characterized in that, There are four second sub-cores, and each second sub-core is flat. Two of the second sub-cores are yoke cores, and the remaining two are bypass cores. The two yoke cores are arranged opposite each other along the winding axis of the coil and are respectively connected to both ends of the central core. The two bypass cores are arranged opposite each other and distributed on both sides of the winding axis of the inductor assembly. The inductor assembly is arranged between the four second sub-cores, and both ends of the coil wire pass through the corresponding clearance portion and extend out of the placement cavity.

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