Inductor assembly and inductor

Abstract

The utility model relates to the technical field of inductors, in particular to an inductor capable of rapidly dissipating heat. The inductor comprises a coil, a magnetic core and an insulator, the insulator fixes the coil and the magnetic core, the magnetic core comprises a magnetic core column and an end magnet yoke which is in magnetic conduction with the magnetic core column, the end magnet yoke is connected with the magnetic core column, and at least part of the magnetic core column extends into the coil; the side, facing the radiator, of the inductor is a first heat dissipation side, the coil is provided with a first heat dissipation face located on the first heat dissipation side, and the first heat dissipation face dissipates heat to the radiator. The magnetic core of the inductor comprises the magnetic core column and the end magnet yoke, the end magnet yoke is in magnetic conduction with the magnetic core column, the end magnet yoke is provided with the extension part facing the first heat dissipation side, and the extension part protrudes relative to the magnetic core column, so that the distance between the extension part and the heat dissipation device can be reduced, and the heat dissipation efficiency of the end magnet yoke is improved; and the heat dissipation effect of the magnetic core is improved.

Description

Technical Field

[0001] This application relates to the technical field of inductors, and particularly to an inductor capable of rapid heat dissipation. Background Art

[0002] At present, high-power inductors for automobiles usually include coils, magnetic cores, and insulators. During operation, the coils and magnetic cores generate a large amount of heat. To maintain the normal operation of the inductor, heat dissipation of the inductor is usually required. Specific heat dissipation methods include air-cooled heat dissipation, water-cooled heat dissipation, and heat-conducting oil heat dissipation, etc. By directly thermally contacting the radiator with the inductor, the heat dissipation efficiency can be improved. Currently, the inductor usually makes one side of the coil contact the radiator through a heat-conducting pad for heat dissipation, and the heat dissipation effect of the coil is good. However, there is still a technical problem that the heat dissipation effect of the magnetic core is poor. Utility Model Content

[0003] This application provides an inductor for improving the technical problem of poor heat dissipation effect of the magnetic core in the current inductor.

[0004] In addition, the purpose of this application is also to provide an inductor assembly using the above inductor.

[0005] In a first aspect, in an embodiment, an inductor is provided. The inductor includes a coil, a magnetic core, and an insulator. The insulator fixes the coil and the magnetic core. The magnetic core includes a magnetic core column and an end yoke magnetically conducting with the magnetic core column. The end yoke is connected to the magnetic core column, and at least a part of the magnetic core column extends into the coil. The side of the inductor facing the radiator is the first heat dissipation side. The coil has a first heat dissipation surface on the first heat dissipation side, and the first heat dissipation surface dissipates heat to the radiator.

[0006] The end yoke has an extension part extending towards the first heat dissipation side. The extension part protrudes towards the first heat dissipation side relative to the magnetic core column, so that the distance between the extension part and the radiator is less than the distance between the magnetic core column and the radiator.

[0007] Further, in an embodiment, the end yoke includes a yoke body, and the yoke body is integrally formed or fixedly assembled with the extension part.

[0008] Further, in an embodiment, the side of the extension part facing the radiator is covered by the insulator, or the side of the extension part facing the radiator is exposed.

[0009] Further, in one embodiment, the insulator is injection molded. The inductor includes a coil seat, the coil seat includes a seat ring and a positioning arm inserted into the coil. The positioning arm is fixed on the seat ring to position the coil. The seat ring has a diversion groove and an inner hole of the seat ring. The magnetic core passes through the inner hole of the seat ring. The diversion groove is on the hole wall of the inner hole of the seat ring and is used to guide the injection fluid for molding the insulator into the gap between the coil and the magnetic core.

[0010] Further, in one embodiment, at least one diversion groove is a heat dissipation side diversion groove. The extending direction of the heat dissipation diversion groove is the same as the extending direction of the magnetic core column. The heat dissipation side diversion groove has a side opening facing the extending part, and the side opening is a flared opening.

[0011] Further, in one embodiment, in the direction from the end of the positioning arm away from the seat ring to the end close to the seat ring, the groove depth of the heat dissipation side diversion groove gradually increases.

[0012] Further, in one embodiment, at least one of the coils is a first coil, at least one of the coils is a second coil, at least one of the magnetic core columns is a first magnetic core column extending into the first coil, at least one of the magnetic core columns is a second magnetic core column extending into the second coil. The number of the heat dissipation side diversion grooves is at least two. At least one of the heat dissipation side diversion grooves is a first diversion groove, and at least one of the heat dissipation side diversion grooves is a second diversion groove. The first diversion groove is used to guide the injection fluid into the gap between the first coil and the first magnetic core column, and the second diversion groove is used to guide the injection fluid into the gap between the second coil and the second magnetic core column. The side of the extending part facing the coil has a protrusion, and the protrusion protrudes towards the area between the first diversion groove and the second diversion groove.

[0013] Further, in one embodiment, the magnetic core column is in thermally conductive contact with the end yoke.

[0014] In a second aspect, in one embodiment, an inductor assembly is provided, including an inductor and a radiator, and the radiator is used to dissipate heat from the inductor;

[0015] The inductor includes a coil, a magnetic core, and an insulator. The insulator fixes the coil and the magnetic core. The magnetic core includes a magnetic core column and an end yoke that is magnetically conductive with the magnetic core column. The end yoke is connected to the magnetic core column, and at least a part of the magnetic core column extends into the coil. The side of the inductor facing the radiator is the first heat dissipation side. The coil has a first heat dissipation surface on the first heat dissipation side, and the first heat dissipation surface dissipates heat to the radiator;

[0016] The end yoke has an extension portion extending toward the first heat dissipation side, and the extension portion protrudes toward the first heat dissipation side relative to the core column, so that the distance between the extension portion and the radiator is less than the distance between the core column and the radiator.

[0017] Further, in an embodiment, the end yoke includes a yoke body, and the yoke body is integrally formed or fixedly assembled with the extension portion.

[0018] Further, in an embodiment, the side of the extension portion facing the radiator is covered by the insulator, or the side of the extension portion facing the radiator is exposed.

[0019] Further, in an embodiment, the insulator is injection-molded. The inductor includes a coil seat, the coil seat includes a seat ring and a positioning arm inserted into the coil. The positioning arm is fixed on the seat ring to position the coil. The seat ring has a flow guiding groove and an inner hole of the seat ring. The core passes through the inner hole of the seat ring. The flow guiding groove is on the hole wall of the inner hole of the seat ring and is used to guide the injection fluid for forming the insulator into the gap between the coil and the core.

[0020] Further, in an embodiment, at least one flow guiding groove is a heat dissipation side flow guiding groove. The extending direction of the heat dissipation flow guiding groove is the same as the extending direction of the core column. The heat dissipation side flow guiding groove has a side opening facing the extension portion, and the side opening is a flared opening.

[0021] Further, in an embodiment, in the direction from the end of the positioning arm far from the seat ring to the end close to the seat ring, the groove depth of the heat dissipation side flow guiding groove gradually increases.

[0022] Further, in an embodiment, at least one of the coils is a first coil, at least one of the coils is a second coil, at least one of the core columns is a first core column extending into the first coil, at least one of the core columns is a second core column extending into the second coil. The number of the heat dissipation side flow guiding grooves is at least two. At least one of the heat dissipation side flow guiding grooves is a first flow guiding groove, and at least one of the heat dissipation side flow guiding grooves is a second flow guiding groove. The first flow guiding groove is used to guide the injection fluid into the gap between the first coil and the first core column, and the second flow guiding groove is used to guide the injection fluid into the gap between the second coil and the second core column. The side of the extension portion facing the coil has a protrusion, and the protrusion protrudes toward the region between the first flow guiding groove and the second flow guiding groove.

[0023] Further, in an embodiment, the core column is in thermally conductive contact with the end yoke.

[0024] Further, in one embodiment, the inductor assembly includes a heat-conducting pad, which is clamped between the inductor and the heat sink for conducting the heat of the inductor to the heat sink.

[0025] For the inductor according to the above embodiment, the magnetic core of the inductor includes a magnetic core column and an end yoke. The end yoke is magnetically conductive with the magnetic core column. The end yoke has an extending portion facing the first heat dissipation side, and the extending portion protrudes relative to the magnetic core column, so that the distance between the extending portion and the heat sink can be reduced, thereby accelerating the heat dissipation efficiency of the end yoke and improving the heat dissipation effect of the magnetic core. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of an inductor assembly in one embodiment;

[0027] Figure 2 is a top view of an inductor assembly in one embodiment;

[0028] Figure 3 is a cross-sectional view along Figure 2 A-A in;

[0029] Figure 4 is a schematic structural diagram of a coil and a magnetic core in one embodiment.

[0030] List of the feature names corresponding to the reference numerals in the drawings: 1. Inductor; 2. Heat sink; 3. Heat-conducting pad; 11. Coil; 111. First heat dissipation surface; 112. First coil; 113. Second coil; 12. Magnetic core; 121. Magnetic core column; 122. End yoke; 1221. Extending portion; 12211. Protrusion; 1222. Yoke body; 13. Insulator; 14. Coil seat; 141. Seat ring; 1411. Flow guide groove; 14111. First flow guide groove; 14112. Side opening; 14113. Groove bottom wall; 14114. Second flow guide groove; 142. Positioning arm.

[0031] Explanation of the reference numerals in parentheses in the drawings: For the reference numerals in parentheses in the drawings, the feature referred to by the reference numeral is both the feature represented by the number in the parentheses and the feature represented by the number outside the parentheses. Detailed Embodiments

[0032] The present application will be further described in detail below in conjunction with the specific embodiments and the accompanying drawings. Similar elements in different embodiments are denoted by related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can 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 to avoid overwhelming the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and 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 can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in a manner obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for clearly describing a certain embodiment and do not mean a necessary sequence, unless it is stated that a certain sequence must be followed.

[0034] The sequence numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The terms "connected" and "coupled" used in the present application, unless otherwise specified, include direct connection, indirect connection, and contact connection (coupling), etc.

[0035] In one embodiment, please refer to Figures 1 to 3 , the inductor assembly includes an inductor 1 and a heat sink 2, and the heat sink 2 is used to dissipate heat from the inductor 1. In one embodiment, the inductor assembly includes a thermal pad 3, and the thermal pad 3 is sandwiched between the inductor 1 and the heat sink 2 for conducting the heat of the inductor 1 to the heat sink 2.

[0036] In one embodiment, please refer to Figures 1 to 4 , the inductor 1 includes a coil 11, a magnetic core 12, and an insulator 13. The insulator 13 fixes the coil 11 and the magnetic core 12. The magnetic core 12 includes a magnetic core column 121 and an end yoke 122 that is magnetically conductive with the magnetic core column 121. The end yoke 122 is connected to the magnetic core column 121, and at least a part of the magnetic core column 121 extends into the coil 11. The side of the inductor 1 facing the heat sink 2 is the first heat dissipation side, and the coil 11 has a first heat dissipation surface 111 on the first heat dissipation side, and the first heat dissipation surface 111 dissipates heat to the heat sink 2.

[0037] The end yoke 122 has an extension portion 1221 extending toward the first heat dissipation side. The extension portion 1221 protrudes toward the first heat dissipation side relative to the core column 121, so that the distance between the extension portion 1221 and the radiator 2 is less than the distance between the core column 121 and the radiator 2.

[0038] Since the end yoke 122 has an extension portion 1221 toward the first heat dissipation side and the extension portion 1221 protrudes relative to the core column 121, the distance between the extension portion 1221 and the radiator 2 can be reduced, making the distance between the extension portion 1221 and the radiator 2 less than the distance between the core column 121 and the radiator 2, thereby accelerating the heat dissipation efficiency of the end yoke 122 and improving the heat dissipation effect of the core 12.

[0039] In one embodiment, please refer to Figure 3 , the core column 121 is in thermally conductive contact with the end yoke 122. In this way, the heat of the core column 121 can also be transferred to the end yoke 122 and dissipated outward, further improving the heat dissipation efficiency.

[0040] Regarding the forming method of the extension portion 1221, in one embodiment, please refer to Figure 3 and Figure 4 , the end yoke 122 includes a yoke body 1222, and the yoke body 1222 and the extension portion 1221 are integrally formed. In another embodiment, the yoke body 1222 and the extension portion 1221 are adhesively fixed together. In yet another embodiment, the yoke body 1222 and the extension portion 1221 are adhesively bonded and then hot-pressed and fixed together.

[0041] In one embodiment, please refer to Figure 3 and Figure 4 , the side of the extension portion 1221 facing the radiator 2 is covered by an insulator 13, so that the insulator 13 can protect the extension portion 1221. In another embodiment, the side of the extension portion 1221 facing the radiator 2 is exposed, so that the heat dissipation efficiency can be further improved. It should be noted that in one embodiment, when the extension portion 1221 is exposed, it is in contact with the heat conductive pad 3, which can further improve the heat dissipation efficiency.

[0042] In one embodiment, please refer to Figure 3 and Figure 4, the insulator 13 is injection-molded. The inductor 1 includes a coil base 14. The coil base 14 includes a seat ring 141 and a positioning arm 142 inserted into the coil 11. The positioning arm 142 is fixed on the seat ring 141 to position the coil 11. The seat ring 141 has a diversion groove 1411 and also has an inner hole of the seat ring. The magnetic core 12 passes through the inner hole of the seat ring. The diversion groove 1411 is on the hole wall of the inner hole of the seat ring and is used to guide the injection fluid into the gap between the coil 11 and the magnetic core 12. The diversion groove 1411 can accelerate the entry of the injection fluid, improving the molding efficiency and molding quality.

[0043] In one embodiment, please refer to Figure 3 and Figure 4 , at least one diversion groove 1411 is a heat dissipation side diversion groove. The extending direction of the heat dissipation diversion groove is the same as the extending direction of the magnetic core column 121. The heat dissipation side diversion groove has a side opening 14112 facing the extending portion 1221, and the side opening 14112 is a flared opening. The side opening 14112 being a flared opening can accelerate the entry of the injection fluid and reduce the influence of the obstruction by the extending portion 1221.

[0044] Furthermore, in one embodiment, please refer to Figure 3 and Figure 4 , in the direction from the end of the positioning arm 142 away from the seat ring 141 to the end closer to the seat ring 141, the groove depth of the heat dissipation side diversion groove gradually increases. It should be noted that the depth refers to the distance from the bottom wall 14113 of the diversion groove 1411 to the groove opening directly opposite the bottom wall 14113. In one embodiment, please refer to Figure 3 and Figure 4 , the bottom wall surface of the diversion groove 1411 is an inclined surface. In some other embodiments, the side opening 14112 can also be a trumpet-shaped opening.

[0045] In one embodiment, please refer to Figure 3 and Figure 4, at least one coil 11 is the first coil 112, at least one coil 11 is the second coil 113, at least one magnetic core column 121 is the first magnetic core column extending into the first coil 112, at least one magnetic core column 121 is the second magnetic core column extending into the second coil 113, the number of heat dissipation side diversion grooves on the seat ring 141 has at least two, at least one heat dissipation side diversion groove is the first diversion groove 14111, at least one heat dissipation side diversion groove is the second diversion groove 14114, the first diversion groove 14111 is used to guide the injection molding fluid into the gap between the first coil 112 and the first magnetic core column, the second diversion groove 14114 is used to guide the injection molding fluid into the gap between the second coil 113 and the second magnetic core column, the side of the extension part 1221 facing the coil 11 has 12211, and 12211 protrudes towards the area between the first diversion groove 14111 and the second diversion groove 14114. In this way, it can not only increase the area of the extension part 1221, but also reduce the influence on the first diversion groove 14111 and the second diversion groove 14114.

[0046] In some other embodiments, the volume of the extension part 1221 can also be reduced. For example, in the extending direction of the magnetic core column 121, the extension part 1221 does not block the diversion groove 1411. At this time, the side opening 14112 of the diversion groove 1411 can also be a straight opening instead of a flared opening.

[0047] In one embodiment, please refer to Figure 3 and Figure 4 , the number of coil seats 14 is two, and the positioning arms 142 of the two coil seats 14 are respectively inserted from both ends of the coil 11. The two coil seats 14 pre-assemble the first coil 112 and the second coil 113 together, and then the magnetic core is loaded and placed in the injection mold for positioning, and the magnetic core and the coil are injection molded to form an insulator.

[0048] In one embodiment, please refer to Figure 3 and Figure 4 , the number of end yokes 122 is two, and the function of the end yokes 122 is to conduct magnetism between the first magnetic core column and the second magnetic core column. In one embodiment, the magnetic core 12 is a closed ring shape. In some other embodiments, the magnetic core can also be in the shape of "day".

[0049] In one embodiment, please refer to Figure 3 and Figure 4 , the first heat dissipation surface 111 is exposed outside the insulator 13, which can improve the heat dissipation efficiency of the coil 11. Specifically, in one embodiment, the first heat dissipation surface 111 is in thermal contact with the heat conduction pad 3, and can transfer heat to the radiator 2 faster. In some other embodiments, the insulator 13 can also cover the first heat dissipation surface 111.

[0050] In one embodiment, please refer to Figure 3and Figure 4 The end yoke 122 has a symmetric structure and has a symmetric plane and is symmetric about the symmetric plane. In one embodiment, the two end yokes 122 have the same structure. This facilitates processing and reduces the types of parts.

[0051] In an embodiment of an inductor, the structure of the inductor is the same as that of the inductor described in any of the above embodiments, and will not be described in detail.

[0052] The above uses specific examples to elaborate on the present application, which is only used to help understand the present application and is not intended to limit the present application. For those skilled in the technical field to which the present application pertains, based on the idea of the present application, several simple deductions, deformations or substitutions can also be made.

Claims

1. An inductor, characterized in that, The inductor includes a coil, a magnetic core, and an insulator. The insulator fixes the coil and the magnetic core. The magnetic core includes a magnetic core column and an end yoke magnetically conducting with the magnetic core column. The end yoke is connected to the magnetic core column, and at least part of the magnetic core column extends into the coil. The side of the inductor facing the radiator is the first heat dissipation side. The coil has a first heat dissipation surface on the first heat dissipation side, and the first heat dissipation surface dissipates heat to the radiator. The end yoke has an extension part extending towards the first heat dissipation side. The extension part protrudes towards the first heat dissipation side relative to the magnetic core column, so that the distance between the extension part and the radiator is less than the distance between the magnetic core column and the radiator.

2. The inductor according to claim 1, characterized in that, The end yoke includes a yoke body, and the yoke body is integrally formed or fixedly assembled with the extension part.

3. The inductor according to claim 1, characterized in that, The side of the extension part facing the radiator is covered by the insulator, or the side of the extension part facing the radiator is exposed.

4. The inductor according to claim 1 or 2 or 3, characterized in that, The insulator is injection molded. The inductor includes a coil seat. The coil seat includes a seat ring and a positioning arm inserted into the coil. The positioning arm is fixed on the seat ring to position the coil. The seat ring has a flow guiding groove and a seat ring inner hole. The magnetic core passes through the seat ring inner hole. The flow guiding groove is on the hole wall of the seat ring inner hole and is used to guide the injection molding fluid for forming the insulator into the gap between the coil and the magnetic core.

5. The inductor according to claim 4, wherein At least one flow guiding groove is a heat dissipation side flow guiding groove. The extending direction of the heat dissipation side flow guiding groove is the same as the extending direction of the magnetic core column. The heat dissipation side flow guiding groove has a side opening facing the extension part, and the side opening is a flared opening.

6. The inductor according to claim 5, wherein In the direction from the end of the positioning arm far from the seat ring to the end close to the seat ring, the groove depth of the heat dissipation side flow guiding groove gradually increases.

7. The inductor according to claim 5, wherein, At least one of the coils is a first coil, at least one of the coils is a second coil, at least one of the magnetic core columns is a first magnetic core column extending into the first coil, at least one of the magnetic core columns is a second magnetic core column extending into the second coil. The number of the heat dissipation side flow guiding grooves is at least two. At least one of the heat dissipation side flow guiding grooves is a first flow guiding groove, at least one of the heat dissipation side flow guiding grooves is a second flow guiding groove. The first flow guiding groove is used to guide the injection molding fluid into the gap between the first coil and the first magnetic core column. The second flow guiding groove is used to guide the injection molding fluid into the gap between the second coil and the second magnetic core column. The side of the extension part facing the coil has a protrusion, and the protrusion protrudes towards the area between the first flow guiding groove and the second flow guiding groove.

8. The inductor according to claim 1 or 2 or 3, characterized in that, The magnetic core column is in thermal contact with the end yoke.

9. An inductor component, characterized in that, It includes the inductor as described in any one of claims 1-8 and a radiator. The radiator is used to dissipate heat from the inductor.

10. The inductor component according to claim 9, wherein The inductor assembly includes a heat conducting pad. The heat conducting pad is sandwiched between the inductor and the radiator and is used to conduct the heat of the inductor to the radiator.

Images