Inductor

Abstract

The utility model provides an inductor. The inductor comprises an inductor assembly, an insulating shell and a ceramic cooling fin. The inductor assembly comprises a magnetic core and a coil, and the coil is wound around the magnetic core and fixedly connected with the magnetic core. The insulating shell is provided with a containing cavity and a heat dissipation window communicated with the containing cavity, the magnetic core and the coil are installed in the containing cavity, and at least part of the coil right faces the heat dissipation window. The ceramic cooling fin is a hard component and is fixed to the insulating shell, at least part of the outer surface of the ceramic cooling fin is exposed out of the insulating shell, and the ceramic cooling fin covers the cooling window. According to the inductor disclosed by the utility model, the ceramic radiating fin is directly used as a part of the inductor, and the high heat-conducting property of the ceramic radiating fin is utilized, so that the radiating performance of the inductor is greatly improved, the wire diameter of the wire rod of the coil and the overall volume of the inductor can be greatly reduced, the radiating rate is further improved, and the service life of the inductor is prolonged. The heat dissipation performance is improved, and the product size is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of inductor, concretely relates to an inductor. BACKGROUND

[0002] At present, new energy vehicles, hybrid electric vehicles and the like characterized by automobile electrification are gradually replacing traditional fuel vehicles and becoming one of important means for countries to cope with climate greenhouse effect. The core of automobile electrification is to realize efficient electromechanical coupling of driving through power battery energy storage and motor driving, so as to achieve the purpose of saving oil or completely not using fuel. In the automobile electrification operation mechanism, the obvious feature of battery charging and battery energy discharge driving motor is high-voltage power conversion, and the high-power inductor element in the conversion circuit becomes one of the indispensable important core components.

[0003] At present, the high-power inductor for automobile generally includes a coil, a magnetic core and an insulator, and the coil and the magnetic core generate a large amount of heat during operation. In order to maintain the normal operation of the inductor, the inductor usually needs to be cooled. However, the existing inductor cannot well balance the heat dissipation performance and the volume, and the above problems are technical problems urgently to be solved in the field. UTILITY MODEL CONTENT

[0004] The technical problem solved by the utility model is to provide an inductor that can balance the heat dissipation performance and the volume of the product.

[0005] The scheme for achieving the technical purpose of the utility model is an inductor, comprising:

[0006] An inductor assembly, the inductor assembly comprising a magnetic core and a coil, the coil being wound around the magnetic core, and the coil being connected and fixed with the magnetic core;

[0007] An insulating shell, the insulating shell having a receiving cavity and a heat dissipation window communicating with the receiving cavity, the magnetic core and the coil being installed in the receiving cavity, and at least part of the coil being opposite to the heat dissipation window;

[0008] And a ceramic heat sink, the ceramic heat sink being a hard member, the ceramic heat sink being fixed to the insulating shell, at least part of the outer surface of the ceramic heat sink being exposed to the insulating shell, and the ceramic heat sink covering the heat dissipation window.

[0009] In an optional embodiment, the outer surface of the ceramic heat sink is flush with the outer surface of the side of the injection body.

[0010] In an optional embodiment, the thickness of the ceramic heat sink is 0.2mm-0.5mm.

[0011] In an optional embodiment, the ceramic heat sink is opposite to the outer surface of the coil, and the ceramic heat sink is in direct contact with the coil.

[0012] In an optional embodiment, two ends of the wire of the coil extend out of the insulating housing to form two pins for external connection;

[0013] The magnetic core includes a connected middle column magnetic core and a connecting magnetic core, the coil is wound on the middle column magnetic core, the connecting magnetic core has a placement cavity for placing the middle column magnetic core and the coil, the placement cavity has an opening, and the opening is opposite to the heat dissipation window, and the connecting magnetic core has an avoidance portion for the pin to pass through.

[0014] In an optional embodiment, the center column magnetic core includes at least two first sub-magnetic cores, and the at least two first sub-magnetic cores are arranged in sequence along the winding axis, and the wire of the coil is wound around each first sub-magnetic core.

[0015] In an optional embodiment, the coil and the middle column magnetic core are connected as one body by injection molding, and the outer surface of the first sub-magnetic core has a drainage groove for the injection molding material to flow in the gap between the middle column magnetic core and the coil, and the drainage grooves on two adjacent first sub-magnetic cores are connected.

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

[0017] In an optional embodiment, the number of the second sub-magnetic cores is four, and the second sub-magnetic cores are in a flat plate shape; two of the second sub-magnetic cores are yoke magnetic cores, and the remaining two second sub-magnetic cores are bypass magnetic cores;

[0018] The two yoke cores are arranged opposite to each other along the winding axis of the coil and are respectively connected to the two ends of the middle column core. The two bypass cores are arranged opposite to each other and are distributed on both sides of the winding axis of the inductor component. The inductor component is arranged between the four second sub-cores, and the two ends of the coil wire pass through the corresponding avoidance parts and extend out of the placement cavity.

[0019] In an optional embodiment, the extension direction of the pin is consistent with the winding axis of the coil, and along the winding axis of the coil, the two pins are located at the same end of the coil; the two yoke cores both have the avoidance portion,

[0020] The coil comprises a main body part and an extension part of an integral structure, the main body part is formed by winding wire around the middle column magnetic core, one end of the wire of the main body part is bent towards the yoke magnetic core close to the main body part to pass through the avoiding part and extend out of the insulating shell to form one of the pins, the other end of the wire of the main body part is bent towards the other yoke magnetic core to pass through the avoiding part and connect with the extension part, the extension part is in a U shape, the extension part is located outside the placing cavity and extends along the outer surface of the bypass magnetic core, one end of the U-shaped extension part is connected with the main body part, and the other end of the U-shaped extension part is bent to extend out of the insulating shell to form the other pin.

[0021] According to the inductor in the above embodiment, the ceramic heat dissipation fin is directly used as a part of the inductor, when the inductor is applied to a use scene such as a vehicle-mounted inductor, contact heat exchange can be directly realized through the ceramic heat dissipation fin, and a heat conduction pad does not need to be additionally added. The heat conductivity coefficient of the ceramic heat dissipation fin is much larger than that of a common soft heat conduction pad such as a silica gel heat conduction pad, the heat dissipation performance of the inductor can be greatly improved, and then the wire diameter of the wire of the coil and the overall volume of the inductor can also be greatly reduced, the size of the inductor is reduced, the heat transfer depth can be reduced, the heat dissipation rate can be further improved, and the improvement of the heat dissipation performance and the reduction of the product volume are balanced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The overall structure schematic diagram of the inductor provided for some embodiments of the utility model.

[0023] Figure 2 The Figure 1 explosion view of the inductor in the figure.

[0024] Figure 3 Another perspective view of the Figure 2 in the figure.

[0025] Figure 4 Front view of the inductor of Figure 1 .

[0026] Figure 5 A-A view of the inductor of Figure 4 .

[0027] Figure 6 B-B view of the inductor of Figure 4 .

[0028] Figure 7 Structure schematic diagram of the coil in the inductor of Figure 1 .

[0029] Figure 8 Structure schematic diagram of the pre-structure in the inductor of Figure 1 .

[0030] Figure 9 for Figure 1 Schematic diagram of the pre-structure, connecting core and heat sink in the inductor.

[0031] Figure numerals: 1000-inductor; 100-inductor assembly; 110-magnetic core; 111-middle column magnetic core; 112-first sub-magnetic core; 113-connecting magnetic core; 114-second sub-magnetic core; 115-yoke magnetic core; 116-bypass magnetic core; 117-avoidance part; 120-coil; 121-pin; 122-main body; 123-extension part; 200-insulating shell, 210-heat dissipation window; 300-ceramic heat sink; 400-injection molded body. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted under different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail. They can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0033] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0034] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0035] In order to solve the problem that the inductor 1000 in the prior art cannot have good heat dissipation performance and small size at the same time, the present invention provides an inductor 1000, which includes an inductor component 100, an insulating shell 200 and a ceramic heat sink 300. Figures 1-7, the inductor assembly 100 as the main part of the inductor 1000 generates heat, stores and releases electric energy through electromagnetic induction generated by the coil 120 in the magnetic core 110, the inductor assembly 100 comprises the magnetic core 110 and the coil 120, the coil 120 is arranged around the magnetic core 110, and the coil 120 is connected and fixed with the magnetic core 110. The insulating shell 200 is used as the basis for connecting and installing the inductor 1000 with external structures or other devices to ensure insulation and safety in use. The insulating shell 200 has a containing cavity and a heat dissipation window 210 communicating with the containing cavity, the magnetic core 110 and the coil 120 are installed in the containing cavity, and at least part of the coil 120 is opposite to the heat dissipation window 210. The ceramic heat sink 300 is a hard member, the ceramic heat sink 300 is fixed to the insulating shell 200, at least part of the outer surface of the ceramic heat sink 300 is exposed to the insulating shell 200, and the ceramic heat sink 300 covers the heat dissipation window 210, the thermal conductivity of the ceramic heat sink 300 can reach 20W / m·K-250W / m·K, and the ceramic heat sink 300 has good insulation properties, air tightness and pressure resistance, which can meet the requirements of electrical isolation, the inductor 1000 is connected externally through the ceramic heat sink 300 to exchange heat, the ceramic heat sink 300 can directly exchange heat with air, or contact with external heat exchange equipment to exchange heat, or even directly contact with metal to dissipate heat. The presence of the ceramic heat sink 300 can greatly improve the heat dissipation performance of the inductor 1000, and on the basis of greatly improving the heat dissipation performance of the inductor 1000, the coil 120 with smaller wire diameter can be selected, thereby effectively reducing the overall volume of the inductor 1000 while improving the heat dissipation performance, and the heat dissipation performance and product volume are well balanced.

[0036] According to the inductor 1000 of the technical solution, compared with the related art, the main difference is that: on the one hand, the ceramic heat sink 300 is directly used as part of the inductor 1000, when the inductor 1000 is applied to a use scenario such as a vehicle-mounted inductor 1000, contact heat exchange can be realized directly through the ceramic heat sink 300, such as directly contacting the ceramic heat sink 300 with a water cooler, which is different from the inductor 1000 with part of the coil 120 directly exposed in the related art in composition and structure, and no additional heat-conducting pad is needed in application. On the other hand, the hard ceramic heat sink 300 is used in the present solution, the thermal conductivity of the ceramic heat sink 300 is much higher than that of common soft heat-conducting pads such as silica gel heat-conducting pads, which can greatly improve the heat dissipation performance of the inductor 1000, and the wire diameter of the wire of the coil 120 and the overall volume of the inductor 1000 can also be greatly reduced. The size reduction of the inductor 1000 can reduce the depth of heat transfer, which is beneficial to further improving the heat dissipation rate, and the improvement of the heat dissipation performance and the reduction of the product volume are balanced.

[0037] It should be noted that the above-mentioned “coil 120120 is wound around the magnetic core 110110” means that, in some embodiments, the magnetic core 110 may have multiple parts, and the coil 120 may be wound only around part of the magnetic core 110. In other embodiments, the magnetic core 110 may be a complete structure, and the coil 120 may be directly wound outside the magnetic core 110.

[0038] In some embodiments, please refer to Figure 1 、 Figure 5 and Figure 6 The outer surface of the ceramic heat sink 300 is flush with the outer surface of the side surface of the molded body 400 in which it is located. By ensuring that the ceramic heat sink 300 does not protrude from the side surface of the molded body 400 in which it is located, the thickness dimension of the inductor 1000 relative to the ceramic heat sink 300 can be controlled and the length of the heat transfer path can be effectively shortened, thereby achieving a balance between heat dissipation performance and volume control of the inductor 1000. In addition, because the outer surface of the ceramic heat sink 300 is flush with the outer surface of the side surface of the molded body 400 in which it is located, the side of the inductor 1000 where the ceramic heat sink 300 is exposed is a flat surface. Therefore, during use, the ceramic heat sink 300 and the side surface of the molded body 400 in which it is located can simultaneously contact and connect with the external structure. The ceramic heat sink 300 and the molded body 400 can simultaneously achieve contact heat exchange with the external structure, thereby increasing the overall heat exchange area between the inductor 1000 and the external structure.

[0039] In some embodiments, please refer to Figure 5 and Figure 6 The thickness of the ceramic heat sink 300 is 0.2 mm to 0.5 mm. Since the ceramic heat sink 300 has good insulation properties and excellent air tightness, a thinner ceramic heat sink 300 can also ensure that the electrical isolation requirement is met. Therefore, by controlling the thickness of the ceramic heat sink 300 between 0.2 mm and 0.5 mm, the size of the inductor 1000 in the thickness direction can be further controlled while ensuring the performance of the inductor 1000, which is conducive to reducing the overall volume of the inductor 1000.

[0040] In some embodiments, please refer to Figure 5 and Figure 9 The ceramic heat sink 300 is opposite to the outer surface of the coil 120 and is in direct contact with the coil 120. By making the ceramic heat sink 300 directly contact and opposite to the side of the coil 120, the ceramic heat sink 300 and the inductor component 100 have a sufficient direct contact area, forming a direct contact heat transfer method. The heat generated by the inductor component 100 is directly transferred to the ceramic heat sink 300, and then the heat is transferred from the ceramic heat sink 300 to the outside, which can further shorten the length of the heat transfer path, effectively improve the heat dissipation performance, and at the same time is beneficial to the overall volume control of the inductor 1000.

[0041] In other embodiments, on the basis of effectively reducing the wire diameter of the coil 120 and the overall volume of the inductor assembly 100, the ceramic heat sink 300 can be separated from the outer surface of the coil 120, that is, an air heat conduction layer is formed between the ceramic heat sink 300 and the inductor assembly 100. In this case, the overall heat dissipation performance of the inductor 1000 can be ensured by using a ceramic heat sink 300 with a higher thermal conductivity coefficient.

[0042] In some embodiments, please refer to Figures 1-4 To achieve external electrical connection of inductor 1000, both ends of the wire of coil 120 extend outside of insulating housing 200 to form two pins 121 for external connection. Both pins 121 can be located on either side of insulating housing 200. In other words, in different embodiments, both pins 121 can be located on the same side of insulating housing 200 or on different sides. This can be adjusted adaptively based on specific needs and is not specifically limited in this invention.

[0043] In some embodiments, please refer to Figures 5-9 The magnetic core 110 includes a connected central core 111 and a connecting core 113. The coil 120 is wound on the central core 111. The connecting core 113 has a placement cavity for placing the central core 111 and the coil 120. The placement cavity has an opening, and the opening is opposite to the heat dissipation window 210. The connecting core 113 has a relief portion 117 for the pins 121 to pass through. The two ends of the wire of the coil 120 pass through the relief portion 117 and the insulating housing 200. The magnetic core 110 is divided into the central core 111 and the connecting core 113. The coil 120 is only wound on the central core 111. The connecting core 113 forms a protective frame structure around the central core 111 and the coil 120. While improving the inductance performance, it also serves as the positioning basis when the inductor assembly 100 and the insulating housing 200 are assembled, and can also improve the rigidity and pressure resistance of the inductor assembly 100 to a certain extent.

[0044] In some embodiments, please refer to Figure 6 The center magnetic core 111 includes at least two first sub-cores 112, which are arranged in sequence along the winding axis. A wire of the coil 120 is wound around each first sub-core 112 to enhance the inductance of the center magnetic core 111. For example, in some embodiments, the number of first sub-cores 112 may be three.

[0045] In some embodiments, please refer to Figure 8The coil 120 and the center column core 111 are connected as one body through injection molding to form a pre-structure, and the insulating shell 200 then connects and fixes the pre-structure, the connecting core 113 and the ceramic heat sink 300. The outer surface of the first sub-core 112 has a drainage groove for the flow of injection molding material, and the drainage grooves on the two adjacent first sub-cores 112 are connected to ensure the connection strength between the coil 120 and the center column core 111. In the process of obtaining the pre-structure through the injection molding process, the mold can be used to make the surface of the coil 120 have a better flatness, and then when the ceramic heat sink 300 is installed, the ceramic heat sink 300 can be pressed tightly against the surface of the coil 120, and the problem of the ceramic heat sink 300 being damaged due to stress concentration caused by unevenness and protrusions on the surface of the coil 120 can be effectively avoided.

[0046] The present application does not limit the method of fixing the ceramic heat sink 300 to the insulating housing 200, and any feasible fixing solution such as gluing or injection molding with the insulating housing 200 can be used.

[0047] In some embodiments, the insulating shell 200 can be an injection-molded part, and the insulating shell 200 is formed on the connecting magnetic core 113, the ceramic heat sink 300 and the pre-structure through an injection molding process, and the outer surface of the ceramic heat sink 300 is exposed to the insulating shell 200 to form an integrated inductor 1000, thereby making the ceramic heat sink 300 stably connected to the inductor component 100 and fixed to the insulating shell 200. In other words, the molding of the inductor 1000 includes two injection molding processes. A pre-structure is obtained through one injection molding, which ensures the flatness and smoothness of the outer surface of the coil 120. The secondary injection molding process of the insulating shell 200 can connect the pre-structure, the connecting magnetic core 113 and the ceramic heat sink 300 into one body to obtain the final inductor 1000. The injection mold can ensure that the ceramic heat sink 300 is pressed tightly against the surface of the coil 120 and that the ceramic heat sink 300 is not crushed. The ceramic heat sink 300 can be made thinner as needed. The thinner ceramic heat sink 300 can shorten the heat transfer depth of the inductor component 100, thereby further improving the heat dissipation performance of the inductor 1000.

[0048] In addition, the insulating shell 200 is directly formed on the connection core 113, the ceramic heat sink 300 and the pre-structure using an injection molding process, which can more directly and quickly obtain an integrated inductor 1000, and can better make the outer surface of the ceramic heat sink 300 flush with the outer surface of the insulating shell 200. In the obtained product, the ceramic heat sink 300 and the coil 120 can fit more closely, which can effectively improve the contact degree between the ceramic heat sink 300 and the coil 120, thereby effectively improving the heat transfer effect and improving the stability of the product.

[0049] The present invention does not limit the selection of injection materials and molding preparation schemes for the injection molded body 400. It can be any material feasible in the prior art, such as PPS, PA, PET, etc., which will not be elaborated here. Please refer to relevant technologies for details.

[0050] In some embodiments, please refer to Figure 2 、 Figure 3 and Figure 9 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 to form a placement cavity. The avoidance portion 117 is provided on at least one of the second sub-magnetic cores 114. The connecting magnetic core 113 is designed to be a split structure. On the one hand, it is convenient to assemble 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 use effect is better, which is beneficial to the improvement of the inductance performance of the inductor 1000.

[0051] In some embodiments, please refer to Figure 9 There are four second sub-cores 114, each of which is flat. 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 the ends of the center 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 the ends of the wire of the coil 120 pass through the corresponding avoidance portions 117 and extend outside the placement cavity. The four second sub-cores 114 are all flat, without inflection points or corners, further simplifying the structure of the second sub-cores 114 and facilitating further improvement of the inductance performance of the inductor assembly 100.

[0052] In some embodiments, please refer to Figures 7-9The extension direction of the two pins 121 is consistent with the winding axis of the coil 120, and the two pins 121 are located at the same end of the coil 120 along the winding axis of the coil 120; and the two yoke magnetic cores 115 each have an avoiding portion 117. The coil 120 comprises a main body portion 122 and an extension portion 123 in an integral structure, the main body portion 122 is formed by winding a wire around the center column magnetic core 111, one end of the wire of the main body portion 122 is bent towards the adjacent yoke magnetic core 115 to pass through the avoiding portion 117 and extend out of the insulating shell 200 to form one of the two pins 121, and the other end of the wire of the main body portion 122 is bent towards the other yoke magnetic core 115 to pass through the avoiding portion 117 and be connected with the extension portion 123, the extension portion 123 is in a U shape, the extension portion 123 is located outside the placement cavity and extends along the outer surface of the bypass magnetic core 116, one end of the U-shaped extension portion 123 is connected with the main body portion 122, and the other end of the U-shaped extension portion 123 is bent to extend out of the insulating shell 200 to form the other pin 121. On the one hand, the other end of the wire of the main body portion 122 is bent multiple times to extend around the yoke magnetic core 115 and the bypass magnetic core 116, so that the overall volume of the inductor assembly 100 is effectively controlled, and the yoke magnetic core 115 and the bypass magnetic core 116 can also provide rigid support for the wire. On the other hand, the two pins 121 are arranged on the same side surface of the insulating shell 200, and the extension directions of the two pins 121 are consistent, so that the external electrical connection of the inductor 1000 is facilitated.

[0053] In some embodiments, referring to Figure 1 and Figure 4 In a cross section perpendicular to the winding axis of the coil 120, the length dimension of the closed figure enclosed by the four side surfaces of the insulating shell 200 is L, and the thickness dimension is H, and L:H is greater than or equal to 3:1; and the ceramic heat sink 300 is arranged on the side surface of the insulating shell 200 corresponding to the length dimension L, that is, the ceramic heat sink 300 and the heat dissipation window 210 are both located on the large surface of the insulating shell 200. That is, by increasing the length-thickness ratio of the entire product, and the length-thickness ratio of the product is not less than 3, the heat dissipation path of heat to the ceramic heat sink 300 is mainly in the direction along the thickness dimension H of the insulating shell 200, so that the heat transfer depth of the inductor assembly 100 can be further shortened, which is beneficial to overall heat dissipation. In addition, if the dimension L of the insulating shell 200 is large, it is beneficial to increase the size of the ceramic heat sink 300, that is, the heat dissipation area exposed, and thus it is beneficial to further improve the heat dissipation performance of the inductor 1000.

[0054] In summary, the inductor 1000 provided by the present application has at least the following beneficial effects:

[0055] On the one hand, the ceramic heat sink 300 is directly used as a part of the inductor 1000. When the inductor 1000 is applied to a usage scenario such as an in-vehicle inductor 1000, contact heat exchange can be achieved directly through the ceramic heat sink 300. For example, the ceramic heat sink 300 is directly in contact with the water cooler. This is different from the inductor 1000 in the related art where part of the coil 120 is directly exposed in both composition and structure, and no additional thermal pad is required during application. The inductor 1000 is connected to the outside for heat exchange through the ceramic heat sink 300. The ceramic heat sink 300 can directly exchange heat with the air, or it can be in contact with an external heat exchange device to achieve heat exchange, or it can even be directly in contact with metal to dissipate heat.

[0056] On the other hand, this solution uses a hard ceramic heat sink 300, which has excellent insulation properties, airtightness, and pressure resistance, and can meet the requirements of electrical isolation. The thermal conductivity of the ceramic heat sink 300 can reach 20W / m·K to 250W / m·K. 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. In turn, the wire diameter of the coil 120 and the overall volume of the inductor 1000 can be significantly reduced. The reduced size of the inductor 1000 can reduce the depth of heat transfer, which is conducive to further improving the heat dissipation rate, taking into account both the improvement of heat dissipation performance and the reduction of product volume.

[0057] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art of the present invention can make some simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. An inductor, characterized in that: include: An inductor assembly, the inductor assembly comprising a magnetic core and a coil, the coil being wound around the magnetic core and fixedly connected to the magnetic core; an insulating housing having a receiving cavity and a heat dissipation window communicating with the receiving cavity, wherein the magnetic core and the coil are installed in the receiving cavity, and at least a portion of the coil is opposite to the heat dissipation window; and a ceramic heat sink, which is a hard component and is fixed to the insulating shell. At least part of the outer surface of the ceramic heat sink is exposed to the insulating shell, and the ceramic heat sink covers the heat dissipation window.

2. The inductor according to claim 1, wherein The outer surface of the ceramic heat sink is flush with the outer surface of the side surface of the injection molded body.

3. The inductor according to claim 1, wherein The thickness of the ceramic heat sink is 0.2 mm to 0.5 mm.

4. The inductor according to claim 1, wherein The ceramic heat sink is opposite to the outer surface of the coil, and the ceramic heat sink is in direct contact with the coil.

5. The inductor according to claim 1, wherein Two ends of the wire of the coil extend out of the insulating housing to form two pins for external connection; The magnetic core includes a connected middle column magnetic core and a connecting magnetic core, the coil is wound on the middle column magnetic core, the connecting magnetic core has a placement cavity for placing the middle column magnetic core and the coil, the placement cavity has an opening, and the opening is opposite to the heat dissipation window, and the connecting magnetic core has an avoidance portion for the pin to pass through.

6. The inductor according to claim 5, wherein The center column magnetic core includes at least two first sub-magnetic cores, which are arranged in sequence along the winding axis, and the wire of the coil is wound around each of the first sub-magnetic cores.

7. The inductor according to claim 6, wherein: The coil and the middle column magnetic core are connected as one body by injection molding. The outer surface of the first sub-magnetic core has a drainage groove for the injection molding material to flow in the gap between the middle column magnetic core and the coil. The drainage grooves on two adjacent first sub-magnetic cores are connected.

8. The inductor according to claim 5, wherein The connecting magnetic core includes at least two second sub-magnetic cores, the two second sub-magnetic cores are connected end to end to enclose the placement cavity, and the avoidance portion is provided on at least one of the second sub-magnetic cores.

9. The inductor according to claim 8, wherein There are four second sub-magnetic cores, each of which is in a flat plate shape; two of the second sub-magnetic cores are yoke cores, and the remaining two second sub-magnetic cores are bypass cores; The two yoke cores are arranged opposite to each other along the winding axis of the coil and are respectively connected to the two ends of the middle column core. The two bypass cores are arranged opposite to each other and are distributed on both sides of the winding axis of the inductor component. The inductor component is arranged between the four second sub-cores, and the two ends of the coil wire pass through the corresponding avoidance parts and extend out of the placement cavity.

10. The inductor according to claim 9, wherein The extending direction of the pin is consistent with the winding axis of the coil, and along the winding axis of the coil, the two pins are located at the same end of the coil; the two yoke cores both have the avoidance portion, The coil includes a main body and an extension part of an integral structure, the main body being formed by winding a wire around the center column core, one end of the wire of the main body being bent toward the adjacent yoke core to pass through the avoidance part and extend out of the insulating shell to form one of the pins, the other end of the wire of the main body being bent toward the other yoke core to pass through the avoidance part and be connected to the extension part, the extension part being U-shaped, the extension part being located outside the placement cavity and extending along the outer surface of the bypass core, one end of the U-shaped extension part being connected to the main body, and the other end of the U-shaped extension part being bent to extend out of the insulating shell to form another pin.

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