CN216133740U - Power inductor and electronic equipment - Google Patents

Abstract

The application provides a power inductor and an electronic device. The power inductor includes a magnetic core, a winding, and a heat sink. The winding comprises a plurality of layers of connected winding coils, and a gap is formed between every two adjacent winding coils in at least part of the winding coils. The heat dissipation part comprises a heat dissipation part, the heat dissipation part is arranged on the winding, and the heat dissipation part is in insertion fit with each gap, so that each winding coil forming the gap is in contact with the heat dissipation part. In this application, through set up the radiating piece on the winding, make and form fixed clearance between the winding, increase heat radiating area further dispels the heat to the external world through the radiating piece to improve power inductor's radiating efficiency.

Description

Power inductor and electronic equipment

Technical Field

The present application relates to the field of electronic device technology, and in particular, to a power inductor and an electronic device.

Background

Inductors are one of the components commonly used in electrical circuits. The inductor can produce certain heat at the in-process of work, especially for power inductor, the electric current that flows through on the inductance winding of inductor is great, and the heat of production is more, and the magnetic core also can produce a large amount of heats in addition, also can be blockked the heat dissipation by the coil winding, if can not effectively dispel, can cause the influence to the job stabilization nature of inductor. The existing inductor heat dissipation mostly adopts packaging type heat dissipation, and the heat dissipation effect is poor. Therefore, it is an urgent problem to improve the heat dissipation efficiency of the power inductor.

SUMMERY OF THE UTILITY MODEL

The application provides a power inductor can improve power inductor's radiating efficiency to solve the poor technical problem of current power inductor radiating efficiency.

The present application provides a power inductor comprising: the magnetic core comprises a magnetic core upright post, a magnetic core top cover and a magnetic core bottom cover, and the magnetic core top cover and the magnetic core bottom cover are respectively connected with the two axial opposite ends of the magnetic core upright post; the winding comprises a plurality of layers of connected winding coils, the plurality of layers of winding coils are arranged along a first direction, a gap is formed between every two adjacent winding coils in at least part of the winding coils, and the first direction is the length direction of the winding and is the same as the axial direction of the magnetic core upright post; the heat dissipation part is arranged on the winding and is in inserted fit with at least one gap, so that a winding coil forming the gap is contacted with the heat dissipation part. The winding is sleeved on the peripheral surface of the magnetic core upright post and is insulated from the magnetic core upright post, the winding coil surrounds the magnetic core upright post, and the heat dissipation part is positioned between the magnetic core top cover and the magnetic core bottom cover.

In this embodiment, the heat dissipation member is disposed on the winding, so that heat generated by the winding can be dissipated to the outside through the heat dissipation member, thereby improving the heat dissipation efficiency of the power inductor. Simultaneously, through inserting the heat dissipation part of radiating piece in the clearance that forms between the adjacent winding coil, the heat dissipation part has the supporting role to the winding coil, can realize the control to the clearance size through the structure that sets up the heat dissipation part to make each position heat dissipation homogeneous of winding, guarantee that power inductor heat dissipation is even, lead to the too big problem of heat dissipation condition difference because the clearance is uncontrollable between the winding coil in order to avoid. In addition, the heat dissipation piece in this embodiment simple structure does benefit to the structure of simplifying power inductor, can not lead to the inductance too heavy, practices thrift cost and resource simultaneously to heat dissipation piece direct mount in this application need not change the magnetic core or the structure of winding can improve power inductor's radiating efficiency, can not lead to the fact the influence to power inductor's self electrical property and magnetic property.

In one embodiment, the heat sink includes a body, the heat sink includes a plurality of heat dissipation fins, the heat dissipation fins are protruded from a side surface of the body and are arranged at intervals along the first direction, the plurality of heat dissipation fins are in one-to-one correspondence with the gaps, and each heat dissipation fin is inserted into the corresponding gap; the two ends of the body in the length direction are respectively connected with the magnetic core top cover and the magnetic core bottom cover, and the length direction of the body is the same as the first direction.

The heat dissipation fins are inserted into the corresponding gaps, the two winding coils adjacent to the heat dissipation fins are in contact with the heat dissipation fins, and the plurality of heat dissipation fins are in one-to-one correspondence with the gaps, so that heat on the two adjacent winding coils can be directly transmitted to the corresponding heat dissipation fins and then dissipated out of the heat dissipation fins, the contact area between the windings and the heat dissipation fins is increased, and the purpose of improving the heat dissipation efficiency of the power inductor is achieved. Meanwhile, two adjacent winding coils of the radiating fins are in contact with the radiating fins, and the radiating fins support the corresponding winding coils, so that the purpose of controlling the size of the gap is achieved, the radiating of all parts of the winding is uniform, and the problem of overlarge difference of radiating conditions caused by uncontrollable gap between the winding coils is solved.

In one embodiment, in the first direction, the thicknesses of the plurality of heat dissipation fins are the same, and the distance between every two adjacent heat dissipation fins is the same as the thickness of the winding coil in the first direction. When the radiating piece is arranged on the winding and the radiating fins are inserted into the corresponding gaps, the radiating fins also play a role in supporting the winding coils, so that the distance between every two adjacent winding coils is equal, and the layers of winding coils are uniformly distributed in the first direction. Therefore, the heat dissipation area and the heat dissipation space of the coils of the plurality of layers of windings are the same, and the heat dissipation of the windings at all positions in the first direction is uniform, so that the instability of the working performance of the power inductor caused by overheating at a certain position of the windings is avoided.

In one embodiment, the plurality of heat dissipation fins include a first heat dissipation fin and a second heat dissipation fin, the second heat dissipation fin is located at the middle position of the body, and in the first direction, the thickness of the second heat dissipation fin is greater than that of the first heat dissipation fin. Because the middle part of the winding is easy to gather more heat, the thickness of the second radiating fin is set to be larger than that of the first radiating fin, the distance between two adjacent winding coils in the middle part of the winding can be increased, the winding coil in the middle part of the winding has a larger radiating space, and therefore the radiating efficiency of the winding coil in the middle part of the winding is improved.

In one embodiment, the heat dissipation portion further includes a heat dissipation structure located outside the winding coil, and the heat dissipation structure is protruded on another side surface of the body opposite to the direction of the heat dissipation fins, or the heat dissipation structure is protruded on end portions of the heat dissipation fins. In this embodiment, the heat dissipation area of the heat dissipation structure can be further increased by providing the heat dissipation structure, so as to improve the heat dissipation efficiency of the power inductor

In one embodiment, the outer surfaces of the body and the heat dissipating fins are coated with a heat dissipating coating. The heat dissipation coating can be made of heat conduction materials such as heat conduction organic silicon or heat conduction resin. The heat dissipation coating can increase and enable heat on the heat dissipation piece to be transmitted to the outside more efficiently and rapidly, and therefore the heat dissipation efficiency of the power inductor is improved.

In one possible embodiment, the heat sink is made of a metal material, and an insulating layer is wrapped on the outer surface of the metal material. The metal material may be iron, copper, aluminum, or the like. The insulating layer can be made of insulating materials such as plastics, rubber, fibers and the like, as long as the surface of the heat dissipation piece is insulated. In one embodiment, the heat sink may also be made of an insulating material, and the insulating material may be a polymer material such as plastic and rubber, or an inorganic non-metal material such as ceramic.

In one embodiment, the plurality of layers of winding coils are formed with an outer peripheral surface and an inner peripheral surface, the body is attached to the outer peripheral surface of the winding coil, and the heat dissipation fins are inserted into the gaps from the outer peripheral surface of the winding coil. The heat on the winding coil can be transferred to the body and then transferred from the body to the outside to increase the heat dissipation efficiency of the power inductor.

In one embodiment, the body is attached to an inner peripheral surface of the winding coil, and the heat dissipation fin is inserted into the gap from the inner peripheral surface of the winding coil and protrudes out of the winding through the outer peripheral surface. The winding coils positioned on the two sides of the radiating fins are in contact with the radiating fins, so that heat on the winding coils can be transmitted to the radiating fins and then transmitted to the outside by the radiating fins, and the radiating efficiency of the winding coils is improved. Because the radiating fins directly extend out of the winding and are exposed in the external environment, the area contacting with the external air is large, and the heat transmitted to the radiating fins by the magnetic core upright posts and the winding can be more quickly and efficiently transmitted to the outside, thereby further improving the radiating efficiency of the power inductor.

In one embodiment, the winding is provided with two heat dissipation members, the heat dissipation members are located on two opposite sides of the winding, the magnetic core further comprises two magnetic core side columns, the magnetic core side columns are fixed between the magnetic core top cover and the magnetic core bottom cover, the two magnetic core side columns are respectively located on two opposite first sides of the magnetic core stand column and are arranged at intervals with the magnetic core stand column, the heat dissipation members are located on two opposite second sides of the magnetic core stand column, and the directions of the first sides and the second sides are different. The magnetic core side columns are arranged on the two sides of the magnetic core vertical column, so that the magnetic core side columns further restrain the inductance generated by electrifying the winding around the power inductor, and the inductance generated by the winding coil is further increased. In this embodiment, the number of the heat dissipation members is two, and heat generated by the winding coil and the magnetic core can be dissipated through the two heat dissipation members, so that the heat dissipation efficiency of the power inductor is further enhanced.

In one embodiment, the number of the magnetic core columns is two, the two magnetic core columns are fixed between the magnetic core top cover and the magnetic core bottom cover in parallel at intervals, one winding is sleeved on each magnetic core column, one heat dissipation part is arranged on each winding, and the two heat dissipation parts on the windings respectively face back to the two magnetic core columns.

Through setting up two magnetic core stands, and all overlap on each magnetic core stand and establish one the winding, the magnetic flux that two windings produced can superpose each other to increase power inductor's inductance value. The two heat dissipation members may dissipate heat for the two windings, respectively, thereby increasing heat dissipation efficiency of the power inductor.

In one embodiment, the magnetic core further includes a magnetic core center pillar, the magnetic core center pillar is fixed between the magnetic core top cover and the magnetic core bottom cover, and the magnetic core center pillar is located between two of the magnetic core columns and is spaced apart from the magnetic core columns. The magnetic core center pillar is arranged between the two magnetic core columns, so that the magnetic core center pillar further restrains the inductance generated by electrifying the winding around the power inductor, and the inductance generated by the winding coil is further increased.

In one embodiment, the power inductor further comprises an auxiliary heat sink, the auxiliary heat sink comprises an auxiliary body, the auxiliary body comprises two side surfaces facing opposite directions, each side surface is convexly provided with a plurality of auxiliary heat dissipation fins, and the plurality of auxiliary heat dissipation fins on each side surface are arranged at intervals along the first direction; the auxiliary heat dissipation member is located between the two magnetic core columns, and the auxiliary heat dissipation fins on each side surface are inserted into gaps of windings of the magnetic core columns adjacent to the auxiliary heat dissipation fins. In this embodiment, the auxiliary heat dissipation member is disposed, so that heat generated by the winding can be dissipated through the heat dissipation member and the auxiliary heat dissipation member at the same time, and the heat dissipation efficiency of the power inductor is further increased.

In one embodiment, the body is in contact with an outer peripheral surface of the magnetic core column, or the free end portion of the heat dissipation fin is in contact with an outer peripheral surface of the magnetic core column. Through with the body with the outer peripheral face contact of magnetic core stand for heat on the magnetic core stand can directly be transmitted to the body, then transmits the external world by the body, perhaps transmits radiating fin by the body, transmits the external world by radiating fin, thereby can increase the radiating efficiency of magnetic core stand and winding coil. The free end parts of the radiating fins are in contact with the outer peripheral surface of the magnetic core upright post, so that heat on the magnetic core upright post can be directly transmitted to the radiating fins and then transmitted to the outside by the radiating fins, and the radiating efficiency of the power inductor is improved.

In one embodiment, the end of the heat sink fin has a contour conforming to the contour of the core leg; or the outline of the side surface of the body, on which the radiating fins are convexly arranged, is consistent with the outline of the winding coil. Through with the shape profile of radiating fin's tip with the profile of magnetic core stand sets up to unanimity to make radiating fin closely laminate with the outer peripheral face of magnetic core stand, increase the area of contact of radiating fin and magnetic core stand body, thereby make on the magnetic core stand heat can more transmit the body, then transmit the external world from the body, further increased power inductor's radiating efficiency. The outline of the side face of the radiating fin protruding from the body is consistent with the outline of the winding coil, so that the body is tightly matched with the outer peripheral face of the winding coil, the contact area of the body and the coil is increased, more heat on the winding coil can be transmitted to the body, then the heat is transmitted to the outside from the body, and the radiating efficiency of the power inductor is further increased.

In one embodiment, when the heat dissipation fins are inserted into the gap from the outer peripheral surface of the coil winding, the ends of the heat dissipation fins contact the surface of the magnetic core column, and the heat dissipation fins at the two ends of the heat dissipation member contact the surfaces of the magnetic core top cover and the magnetic core bottom cover and have a space between the winding and the magnetic core column, so as to insulate the winding and the magnetic core.

In the embodiment, the heat on the magnetic core column can be directly transmitted to the radiating fins and then transmitted to the outside by the radiating fins, so that the radiating efficiency of the power inductor is improved. In this embodiment, the heat dissipation fin near the top cover of the magnetic core extends to between the top cover of the magnetic core and the winding coil to insulate the winding from the top cover of the magnetic core, and the heat dissipation fin near the bottom cover of the magnetic core extends to between the bottom cover of the magnetic core and the winding coil to insulate the winding from the bottom cover of the magnetic core. Meanwhile, the extended heat dissipation fins may replace the insulating member, so that the structure of the power inductor may be simplified.

In one embodiment, the power inductor further includes a top plate, a bottom plate, and a fixing member, the top plate is fixed on a surface of the magnetic core top cover facing away from the magnetic core pillar, the bottom plate is fixed on a surface of the magnetic core bottom cover facing away from the magnetic core pillar, and the fixing member is used for fixing the top plate and the bottom plate relative to each other. The top plate and the bottom plate can achieve the purpose of protecting the magnetic core top cover and the magnetic core bottom cover. The top plate and the bottom plate are fixed through the fixing piece, so that the magnetic core top cover and the magnetic core bottom cover are fastened on the magnetic core upright post, and the structural stability of the power inductor is enhanced. The fixing piece can be a ribbon which surrounds the top plate and the bottom plate and fastens the top plate and the bottom plate, so that the magnetic core top cover and the magnetic core bottom cover are fastened on the magnetic core upright post. The fixing part can also be a screw, and two ends of the screw are respectively fixed on the top plate and the bottom plate so as to fix the top plate and the bottom plate, so that the magnetic core top cover and the magnetic core bottom cover are fastened on the magnetic core upright post.

The application also provides an electronic device comprising the power inductor. The electronic device may be an inverter, a transformer, or other electronic device. Because the power inductor has good heat dissipation effect, the electronic equipment comprising the power inductor cannot be affected by the heat dissipation problem of the power inductor. In addition, the power inductor of the present application is low in manufacturing cost and light in weight, and therefore, an electronic device including the power inductor can also be low in manufacturing cost and light in weight.

Synthesize the aforesaid, this application is through setting up the radiating piece on the winding to the heat that makes the winding produce can give off to the external world through the radiating piece, thereby improves power inductor's radiating efficiency. Meanwhile, the radiating part of the radiating part is inserted into a gap formed between adjacent winding coils, the radiating part has a supporting effect on the winding coils, and the size of the gap can be controlled by regulating and controlling the structure of the radiating part, so that the radiating of each part of the winding is uniform.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.

Fig. 1 is a schematic plan view of a power inductor provided in an embodiment of the present application;

fig. 2 is an enlarged schematic view of a heat sink in the power inductor shown in fig. 1;

fig. 3 is an enlarged schematic view of a heat sink in another embodiment of the present application;

fig. 4 is a schematic plan view of a power inductor provided in an embodiment of the present application;

fig. 5 is a schematic plan view of a power inductor provided in an embodiment of the present application;

fig. 6 is a schematic plan view of a power inductor provided in an embodiment of the present application;

fig. 7 is a schematic plan view of the power inductor shown in fig. 6 from another perspective;

fig. 8 is a schematic plan view of a power inductor provided in an embodiment of the present application;

fig. 9 is a schematic plan view of a power inductor according to an embodiment of the present application.

Detailed Description

The embodiments of the present application will be described below with reference to the drawings.

The present application provides a power inductor. The power inductor is a commonly used component in a circuit, can be applied to equipment such as an inverter and a transformer, and is used for converting electric energy into magnetic energy, storing the magnetic energy, releasing the magnetic energy at a proper time and converting the magnetic energy into the electric energy, namely realizing the function of electromagnetic conversion, realizing the function of allowing direct current to pass and blocking alternating current, or avoiding sudden change of current flowing through the inductor.

Referring to fig. 1, a power inductor 100 includes a magnetic core 10, a winding 20, and a heat sink 30. The magnetic core 10 includes a magnetic core column 11, a magnetic core top cover 12 and a magnetic core bottom cover 13, wherein the magnetic core top cover 12 and the magnetic core bottom cover 13 are respectively connected to two opposite axial ends of the magnetic core column 11. The winding 20 comprises a plurality of layers of connected winding coils 21, the plurality of layers of winding coils 21 are arranged along a first direction X, a gap 1 is formed between every two adjacent winding coils 21 in at least part of the winding coils 21, and the first direction X is the length direction of the winding 20 and is the same as the axial direction of the magnetic core upright post 11. The heat dissipation member 30 includes a heat dissipation portion 31, the heat dissipation member 30 is mounted on the winding 20, and the heat dissipation portion 31 is inserted into and fitted to the at least one gap 1. In this embodiment, a gap 1 is formed between every two adjacent winding coils 21 in all the winding coils 21, and the heat dissipation portion 31 is inserted into and fitted with each gap 1, so that each winding coil 21 constituting the gap 1 is in contact with the heat dissipation portion 31. The winding 20 is sleeved on the outer peripheral surface of the magnetic core upright post 11 and insulated from the magnetic core upright post 11, the winding coil 21 surrounds the magnetic core upright post 11, and the heat sink 30 is fixed between the magnetic core top cover 12 and the magnetic core bottom cover 13. In this embodiment, a gap 1 is formed between every two adjacent winding coils 21 of the winding 20, and the distances of the gaps 1 are the same. In other embodiments, the winding coil 21 in the middle of the winding 20 is provided with a gap, and the gap is provided for the position with larger heat in the middle to increase the heat dissipation speed. In other embodiments, the distance of the gap may be different, but the heat dissipation effect of the whole winding is ensured.

In the present application, the heat dissipation member 30 is disposed on the winding 20, and the heat dissipation member 31 is in direct contact with the winding 20, so that both the heat generated by the winding 20 and the heat of the magnetic core column 11 can be directly dissipated to the outside through the heat dissipation member 30, thereby improving the heat dissipation efficiency of the power inductor 100. Meanwhile, the heat dissipation member 30 in the present application has a simple structure, and is beneficial to simplifying the structure of the power inductor 100 and saving cost and resources, and the heat dissipation member 30 in the present application is directly mounted on the winding 20, so that the heat dissipation efficiency of the power inductor 100 can be improved without changing the structure of the magnetic core 10 or the winding 20, and the electrical performance and the magnetic performance of the power inductor 100 can not be affected.

Referring to fig. 1, the magnetic core 10 is i-shaped. The magnetic core column 11 is an elliptical cylinder, a cylinder or other columns. The magnetic core top cover 12 and the magnetic core bottom cover 13 are respectively connected to the two axial opposite ends of the magnetic core column 11, and the surfaces of the magnetic core top cover 12 and the magnetic core bottom cover 13 are perpendicular to the length direction of the magnetic core column 11. The magnetic core upright post 11 and the magnetic core bottom cover 13 can be integrally formed, and can also be fixedly connected in a bonding, welding or clamping manner and the like. The material of the magnetic core 10 is not limited, and for example, the magnetic core 10 may be made of magnetic powder, or may be made of ferrite material such as nickel-zinc-ferrite or manganese-zinc-ferrite. The magnetic core 10 may be obtained by a die-casting process.

The winding 20 is formed by winding a metal wire. The cross-section of the wire may be of various shapes. For example, it may be a thin round wire or a flat wire. In the present embodiment, the winding 20 is formed by winding a flat copper wire. In other embodiments, the winding 20 may be made of a flat aluminum wire. The same volume of flat wire generates less heat than a round wire, thereby reducing the amount of heat generated by the power inductor 100.

Specifically, in the present embodiment, a copper wire is wound to form a plurality of layers of connected winding coils 21, and a plurality of layers of connected winding coils 21 form the winding 20. In the present embodiment, a gap 1 is formed between every two adjacent winding coils 21. In other embodiments, the gap 1 may also be formed between every two adjacent winding coils 21 in the partial winding coils 21. The spacing in the first direction X of the gaps 1 formed between every two adjacent winding coils 21 may be the same or different. The winding 20 is hollow and cylindrical as a whole, has a mounting space in the middle, and includes an outer peripheral surface and an inner peripheral surface. The surface located in the space for installing the winding 20 is an inner peripheral surface, and the surface located outside the space for installing the winding 20 and facing the inner peripheral surface is an outer peripheral surface. The heat dissipation member 30 is mounted on the winding 20, and the heat dissipation member 31 is fitted in each gap 1. The winding 20 is sleeved on the outer peripheral surface of the magnetic core pillar 11, that is, the magnetic core pillar 11 is located in the installation space of the winding 20. When the direct current passes through the winding 20, the periphery of the winding only presents fixed magnetic lines and does not change along with time; when an alternating current is passed through the winding 20, the winding coil 21 induces an inductance, thereby preventing a current change in the alternating current circuit. The magnetic properties of the core legs 11 themselves can confine the magnetic field more tightly around the power inductor 100, thereby increasing the inductance generated by the winding coil 21.

When the magnetic core column 11 and the magnetic core bottom cover 13 are integrally formed, during assembly, the winding 20 provided with the heat sink 30 is directly sleeved on the outer peripheral surface of the magnetic core column 11, one end of the heat sink 30 is fixedly connected with the magnetic core bottom cover 13, then the magnetic core top cover 12 is fixed at one end of the magnetic core column 11, which is back to the magnetic core bottom cover 13, and the other end of the heat sink 30 is fixedly connected with the magnetic core top cover 12. When the magnetic core upright post 11 and the magnetic core bottom cover 13 are two independent parts, the magnetic core upright post 11 is vertically arranged on the magnetic core bottom cover 13, one end of the heat dissipation member 30 is fixedly connected with the magnetic core bottom cover 13, then the winding 20 provided with the heat dissipation member 30 is sleeved on the outer peripheral surface of the magnetic core upright post 11, then the magnetic core top cover 12 is fixed at the other end of the magnetic core upright post 11, and the other end of the heat dissipation member 30 is fixedly connected with the magnetic core top cover 12.

In one embodiment, the winding 20 is provided with the insulation members 40 near both ends of the core top cover 12 and the core bottom cover 13, and the insulation members 40 insulate the winding 20 from the core top cover 12 and the core bottom cover 13. The insulating member 40 insulates the winding coil 21 from the core bottom cover 13 and the core top cover 12, and serves to insulate the winding 20 from the core 10.

Referring to fig. 1, the power inductor 100 further includes a top plate 51, a bottom plate 52 and a fixing member (not shown), wherein the top plate 51 is fixed on a surface of the top core cover 12 facing away from the vertical core posts 11, the bottom plate 52 is fixed on a surface of the bottom core cover 13 facing away from the vertical core posts 11, and the fixing member is used for fixing the top plate 51 and the bottom plate 52 to fix the top core cover 12 and the bottom core cover 13.

The top plate 51 may be adhesively secured to the surface of the core top cover 12 facing away from the core legs 11, and the bottom plate 52 may also be adhesively secured to the surface of the core bottom cover 13 facing away from the core legs 11. In other embodiments, the top plate 51 and the top core cover 12, and the bottom plate 52 and the bottom core cover 13 may be fixedly connected by other methods. The top plate 51 and the bottom plate 52 can achieve the purpose of protecting the top core cover 12 and the bottom core cover 13. The material of the top plate 51 and the bottom plate 52 is not particularly limited, and may be a metal material such as steel, aluminum, iron, or a non-metal material such as plastic. In this embodiment, the top plate 51 and the bottom plate 52 are both aluminum plates, and the aluminum plates have high thermal conductivity, can quickly dissipate heat, and have high strength, thereby ensuring the structural strength of the power inductor 100.

In one embodiment, the fixing member is a tie 53 (as shown in fig. 7), and the tie 53 surrounds the top plate 51 and the bottom plate 52 to fasten the top plate 51 and the bottom plate 52 relatively, so that the magnetic core top cover 12 and the magnetic core bottom cover 13 are fastened on the magnetic core upright post 11, and the structural stability of the power inductor 100 is enhanced. In other embodiments, the fixing element may also be a screw 54 (as shown in fig. 8), two ends of the screw 54 are respectively fixed on the top plate 51 and the bottom plate 52, and four screws 54 are disposed around the magnetic core column 11 to fix the top plate 51 and the bottom plate 52, so that the magnetic core top cover 12 and the magnetic core bottom cover 13 are limited between the top plate 51 and the bottom plate 52 to be fastened on the magnetic core column 11, thereby enhancing the structural stability of the power inductor 100.

Referring to fig. 1, in an embodiment of the present application, there are two heat dissipation elements 30, and the two heat dissipation elements 30 are respectively located on two opposite sides of the magnetic core pillar 11. The heat generated by the winding coil 21 and the magnetic core 10 can be dissipated through the two heat dissipating members 30, which enhances the heat dissipation efficiency of the power inductor 100. In other embodiments, there may be one heat sink 30, with one heat sink 30 on either side.

Referring to fig. 1 and 2, the heat sink 30 includes a body 32 and a heat sink 31. The heat dissipation portion 31 in this embodiment includes a plurality of heat dissipation fins 33, and the plurality of heat dissipation fins 33 are protruded from a side surface of the body 32 and arranged at intervals along the first direction X. The plurality of heat dissipation fins 33 are in one-to-one correspondence with the gaps 1, and each heat dissipation fin 33 is used for being inserted into the corresponding gap 1. Specifically, the body 32 is a long strip with a certain width and thickness, and opposite ends of the long strip are respectively fixed to the top core cover 12 and the bottom core cover 13. The body 32 includes a first side 321 extending along the first direction X and a second side 322 opposite to the first side 321. The heat sink 30 is comb-shaped, and the heat dissipating fins 33 are thin and are protruded from the first side 321, and are arranged at intervals along the first direction X on the first side 321. In this embodiment, the heat dissipation fins 33 are perpendicular to the first side 321, that is, the heat dissipation fins 33 extend along a second direction Y, and the second direction Y is perpendicular to the first direction X. In other embodiments, the heat dissipation fins 33 may be disposed obliquely to the first side 321 as long as the heat dissipation fins 33 can be inserted into the corresponding gaps 1.

Through inserting radiating fin 33 in the corresponding clearance 1, and constitute two adjacent winding coils 21 of clearance 1 and insert radiating fin 33 surface contact of this clearance 1, several radiating fin 33 and clearance 1 one-to-one simultaneously for the heat on the winding coil 21 can directly be transmitted to corresponding radiating fin 33, then dispel by radiating fin 33, the heat of magnetic core stand 11 also can dispel the heat through clearance 1 simultaneously, avoid winding 20 to influence the heat dissipation of magnetic core stand 11 and avoid winding 20 self heat can not in time dispel, thereby improve power inductor 100 radiating efficiency. Meanwhile, two adjacent winding coils 21 of the radiating fins 33 are in contact with the radiating fins 33, and the radiating fins 33 support the corresponding winding coils 21, so that the size of the gap 1 can be controlled by the structure of the radiating piece 30, the heat of each part of the winding 20 is uniformly radiated, and the problem of overlarge difference of radiating conditions caused by the uncontrollable gap 1 between the winding coils 21 is solved.

In one embodiment, heat sink 30 is made of an insulating material. For example, the heat sink 30 may be formed by injection molding or other processes using a polymer material such as plastic or rubber, so as to reduce the mass of the heat sink 30 and simplify the manufacturing process of the heat sink 30, and the polymer material may have the characteristic of easy processing, so that the shape of the heat sink 30 may be adjusted according to actual needs. The heat sink 30 may also be made of inorganic non-metallic materials such as ceramics by slip casting or the like.

In one embodiment, the heat sink 30 is made of metal and the outer surface of the metal is covered with an insulating layer. The type of the metal material is not particularly limited herein, and may be iron, copper, aluminum, or the like as long as it can be molded. The insulating layer may be made of an insulating material such as plastic, rubber, or fiber, as long as the surface of the heat sink 30 is insulated.

In one embodiment, with reference to fig. 2, in the first direction X, the thicknesses of the plurality of heat dissipation fins 33 are the same, and the distance between every two adjacent heat dissipation fins 33 is the same as the thickness of the winding coil 21 in the first direction X. That is to say, the plurality of heat dissipation fins 33 have the same thickness, and the distance between every two adjacent heat dissipation fins 33 is also the same, and the plurality of heat dissipation fins 33 are uniformly arranged on the body 32 along the first direction X. When the heat sink 30 is mounted on the winding 20 and the heat dissipating fins 33 are inserted into the corresponding gaps 1, the heat dissipating fins 33 also support the winding coils 21, so that the distance between every two adjacent winding coils 21 is equal, and the layers of winding coils 21 are uniformly distributed in the first direction X. Therefore, the heat dissipation areas and the heat dissipation spaces of the plurality of layers of winding coils 21 are the same, the heat dissipation of the winding 20 at each position in the first direction X is uniform, and the instability of the working performance of the power inductor 100 caused by overheating at a certain position of the winding 20 is avoided.

Referring to fig. 1 and 3, in an embodiment, the plurality of heat dissipation fins 33 includes a first heat dissipation fin 331 and a second heat dissipation fin 332, the second heat dissipation fin 332 is located at a middle position of the body 32, and a thickness of the second heat dissipation fin 332 is greater than a thickness of the first heat dissipation fin 331 in the first direction X. Specifically, the first heat dissipation fins 331 are located at positions close to the two ends of the body 32 and distributed at two sides of the area where the second heat dissipation fins 332 are located. That is, in the first direction X, the thickness of the heat radiating fins 33 located at both ends of the body 32 is small, and the thickness of the heat radiating fins 33 located at the middle of the body 32 is large. When the heat dissipating fins 33 are inserted into the gap 1 in a one-to-one correspondence, the distance between two adjacent winding coils 21 located in the middle of the winding 20 is large, and the distance between two adjacent winding coils 21 located at opposite ends of the winding 20 in the first direction X is small. Since more heat is easily accumulated in the middle of the winding 20, the thickness of the second heat dissipation fin 332 is set to be greater than that of the first heat dissipation fin 331, so that the distance between two adjacent winding coils 21 in the middle of the winding 20 can be increased, the winding coils 21 in the middle of the winding 20 have a larger heat dissipation space and a larger contact area, and the heat dissipation efficiency of the winding coils 21 in the middle of the winding 20 is improved.

Referring to fig. 1 and 2, in one embodiment, the body 32 is attached to the outer peripheral surface of the winding coil 21, and the heat dissipation fins 33 are inserted into the gap 1 from the outer peripheral surface of the winding coil 21.

Specifically, the first side surface 321 of the body 32 is attached to the outer peripheral surface of the winding coil 21, the second side surface 322 is exposed outside the power inductor, the heat of the winding coil 21 and the magnetic core column 11 is transferred to the body 32 by the heat dissipation fins 32, the body 11 sucks away the heat on the winding coil 21 through the first side surface 321, and then the heat is dissipated through the second side surface 322 of the body 32, so that the power inductor 100 can dissipate heat timely and effectively. In the present embodiment, the contour of the first side 321 of the body 32 corresponds to the contour of the outer peripheral surface of the winding coil 21. For example, when the outline of the outer circumferential surface of the winding coil 21 is an arc shape, the portion of the first side surface 321 contacting the winding coil 21 is an arc surface matching the arc shape, so that the body 32 is tightly matched with the outer circumferential surface of the winding coil 21, the contact area between the body 32 and the coil is increased, and thus more heat on the winding coil 21 can be transferred to the body 32 and then transferred from the body 32 to the outside, and the heat dissipation efficiency of the power inductor 100 is further increased.

The free end part 333 of the heat radiation fin 33 is inserted into the gap 1 from the outer peripheral surface of the winding coil 21, and the heat radiation fin 33 is in contact with the winding coil 21, so that the heat on the winding coil 21 can be transmitted to the heat radiation fin 33, then transmitted to the outside by the heat radiation fin 33 or transmitted to the body 32, and transmitted to the outside by the body 32, thereby increasing the heat radiation efficiency of the winding coil 21. In this embodiment, after the free end portions 333 of the heat dissipation fins 33 are inserted into the gap 1, the free end portions contact with the outer peripheral surface of the core column 11, so that the heat on the core column 11 can be directly transmitted to the heat dissipation fins 33 and then transmitted to the outside by the heat dissipation fins 33, thereby increasing the heat dissipation efficiency of the power inductor 100. In the present embodiment, the shape and contour of the end 333 of the heat dissipating fin 33 correspond to the contour of the core leg 11. For example, when the contour of the outer peripheral surface of the magnetic core pillar 11 is an arc shape, the shape contour of the end part 333 of the heat dissipation fin 33 is closely fitted to the arc shape to increase the contact area between the heat dissipation fin 33 and the main body 32 of the magnetic core pillar 11, so that the heat on the magnetic core pillar 11 can be more effectively transmitted to the main body 32 for heat dissipation, and the heat dissipation efficiency of the power inductor 100 is further increased.

In one embodiment, the heat dissipation fins 33 at both ends of the heat dissipation member 30 are in contact with the surfaces of the core top cover 12 and the core bottom cover 13 to insulate the windings 20 from the magnetic core 10. That is, among the heat dissipation fins 33 located at both ends of the heat dissipation member 30, the heat dissipation fin 33 near the core top cover 12 extends between the core top cover 12 and the winding coil 21 to insulate the winding 20 from the core top cover 12, and the heat dissipation fin 33 near the core bottom cover 13 extends between the core bottom cover 13 and the winding coil 21 to insulate the winding 20 from the core bottom cover 13. Meanwhile, the free ends of the other heat dissipation fins 33 abut against the outer peripheral surface of the magnetic core column 11, so that an insulation gap is formed between the winding 20 and the magnetic core column 11, and the heat dissipation between the winding 20 and the magnetic core 10 is realized through the heat dissipation member 30 without additionally arranging an insulation member, so that the structure of the power inductor 100 can be simplified.

Referring to fig. 4, in one embodiment, the heat dissipation portion 31 further includes a heat dissipation structure 34 located outside the winding coil 21. When the main body 32 is attached to the outer peripheral surface of the winding coil 21 and the heat dissipation fins 33 are inserted into the gap 1 from the outer peripheral surface of the winding coil 21, the heat dissipation structure 34 is protruded on the other side surface of the main body 32 opposite to the heat dissipation fins 33. That is, the heat dissipation structure 34 is protruded from the second side 322. In this embodiment, the heat dissipation structure 34 may be formed by a plurality of heat dissipation teeth arranged along the first direction X on the second side 322 of the body 32, and the heat dissipation structure 34 extends from the body 32 toward the winding 20. A part of the heat generated by the winding coil 21 is transmitted to the heat dissipation fins 33, then transmitted to the body 32 by the heat dissipation fins 33, then transmitted to the heat dissipation structure 34 by the body 32, and dissipated to the outside by the heat dissipation structure 34. By providing the heat dissipation structure 34, the contact area with the outside is increased, and the heat dissipation area of the heat dissipation member 30 is increased, thereby improving the heat dissipation efficiency of the heat dissipation member 30.

In one embodiment, the heat dissipation teeth are provided with hollow structures (not shown) to further increase the heat dissipation area of the heat dissipation structure, thereby improving the heat dissipation efficiency of the power inductor. In another embodiment, the end of the heat dissipation structure may also be a horn-like structure. The end part of the heat dissipation structure is arranged to be the horn-shaped structure, so that the heat dissipation area of the heat dissipation structure can be increased, and the heat dissipation efficiency of the power inductor is improved.

Referring to fig. 5, in one embodiment, the body 32 is attached to the inner circumferential surface of the winding coil 21, and the heat dissipation fins 33 are inserted into the gap from the inner circumferential surface of the winding coil 21 and extend out of the winding 20 through the outer circumferential surface.

Specifically, the body 32 is located between the inner peripheral surface of the winding coil 21 and the outer peripheral surface of the core leg 11. In the present embodiment, the second side surface 322 is bonded to the outer peripheral surface of the core leg 11, and the first side surface 321 is bonded to the inner peripheral surface of the winding coil 21. The heat on the magnetic core upright post 11 can be directly transferred to the body 32 through the second side surface 322, transferred to the heat dissipation fins 33 from the body 32, and dissipated by the portions of the heat dissipation fins 33 exposed outside the winding 20. The heat on the winding coil 21 can also be directly transmitted to the body 32 through the first side surface 322, and is transferred from the body 32 to the heat dissipation fins 33, the heat on the winding coil 21 can also be transferred to the heat dissipation fins 33 in contact with the heat dissipation fins, and the heat dissipation fins 33 dissipate heat through the parts exposed outside the winding 20, thereby achieving effective heat dissipation of the power inductor 100. In another embodiment, second side surface 322 may have a gap with the outer peripheral surface of core leg 11, and first side surface 321 may have a gap with the inner peripheral surface of winding coil 21.

In one embodiment, the contour of second side 322 corresponds to the contour of the outer peripheral surface of core leg 11, and the contour of first side 321 corresponds to the contour of the inner peripheral surface of winding coil 21. For example, when the contour of the outer peripheral surface of the magnetic core pillar 11 is an arc shape, the contour of the second side surface 322 is an arc surface matched with the arc shape, so that the body 32 is tightly matched with the outer peripheral surface of the magnetic core pillar 11, the contact area between the body 32 and the body 32 of the magnetic core pillar 11 is increased, the heat on the magnetic core pillar 11 can be more effectively transmitted to the body 32 for heat dissipation, and the heat dissipation efficiency of the power inductor 100 is further increased. When the outline of the outer circumferential surface of the winding coil 21 is an arc, the outline of the shape of the portion of the first side surface 321 in contact with the winding coil 21 is an arc surface in arc fit with the arc, so that the body 32 is tightly fitted with the outer circumferential surface of the winding coil 21, the contact area between the body 32 and the winding coil 21 is increased, heat on the winding coil 21 can be more effectively transmitted to the body 32 for heat dissipation, and the heat dissipation efficiency of the power inductor 100 is further increased.

The heat radiation fins 33 are inserted into the gap 1 from the inner peripheral surface of the winding coil 21 and protrude out of the winding 20 through the outer peripheral surface. The heat radiating fins 33 are in contact with the winding coil 21 so that heat on the winding coil 21 can be transferred to the heat radiating fins 33 and then transferred to the outside by the heat radiating fins 33, increasing the heat radiating efficiency of the winding coil 21. In this embodiment, the heat dissipating fins 33 directly extend out of the winding 20 and are exposed in the external environment, the area contacting the external air is large, and the heat transmitted from the magnetic core column 11 and the winding 20 to the heat dissipating fins 33 can be transmitted to the outside more quickly and efficiently, so that the heat dissipating efficiency of the power inductor 100 is further improved.

In one embodiment, when the body 32 is attached to the inner circumferential surface of the winding coil 21 and the heat dissipation fins 33 are inserted into the gap 1 from the inner circumferential surface of the winding coil 21 and extend out of the winding 20 through the outer circumferential surface, the end portions 333 of the heat dissipation fins 33 are protruded with a heat dissipation structure (not shown). In this embodiment, the heat transferred to the heat dissipation fins 33 may be further transferred to the heat dissipation structure, and the heat dissipation structure exchanges heat with the outside, so as to transfer the heat on the heat dissipation structure to the outside, thereby further increasing the heat dissipation efficiency of the power inductor 100. The heat dissipation structure may be the same as the heat dissipation fins 33 and integrally formed with the heat dissipation fins 33, that is, the heat dissipation structure may be formed by extending the heat dissipation fins 33 further toward the length direction of the heat dissipation fins 33.

In one embodiment, the heat dissipation structure is provided with a hollow structure (not shown) to further increase the heat dissipation area of the heat dissipation structure, thereby improving the heat dissipation efficiency of the power inductor. In another embodiment, the end of the heat dissipation structure may also be a horn-like structure. The end part of the heat dissipation structure is arranged to be the horn-shaped structure, so that the heat dissipation area of the heat dissipation structure can be increased, and the heat dissipation efficiency of the power inductor is improved.

In one embodiment of the present application, the outer surfaces of the body 32 and the heat dissipating fins 33 are coated with a heat dissipating coating. The heat dissipation coating can be made of heat conduction materials such as heat conduction organic silicon or heat conduction resin. The heat dissipation coating may increase the efficiency of heat dissipation of the power inductor 100 by allowing heat on the heat dissipation member 30 to be more efficiently and quickly transferred to the outside.

Referring to fig. 6 and 7, in an embodiment of the present application, the magnetic core 10 further includes two magnetic core side pillars 14, the magnetic core side pillars 14 are fixed between the magnetic core top cover 12 and the magnetic core bottom cover 13, and the two magnetic core side pillars 14 are respectively located on two opposite first sides 111 of the magnetic core upright 11 and are spaced apart from the magnetic core upright 11. In this embodiment, the magnetic core column 11 is an elliptic cylinder, two opposite first sides 111 and two opposite second sides 112 are arranged in a staggered manner, and the directions of the first sides 111 and the second sides 112 are different. The two first sides 111 are located on one side of the two long sides of the elliptic cylinder, and the two second sides 112 are located on one side of the two short sides of the elliptic cylinder. Two magnetic core side columns 14 are plate-shaped structures, each magnetic core side column 14 connects the opposite edges of the magnetic core top cover 12 and the magnetic core bottom cover 13, and the two magnetic core side columns 14 are respectively located on the two first sides 111 and are arranged at intervals with the magnetic core upright columns 11. Core leg 14 further constrains the inductance created by energization of winding 20 around power inductor 100, further increasing the amount of inductance created by winding coil 21.

The heat dissipation members 30 are two, and the two heat dissipation members 30 are respectively located on two opposite second sides 112 of the core column 11. The heat generated by the winding coil 21 and the magnetic core 10 can be dissipated through the two heat dissipating members 30, which enhances the heat dissipation efficiency of the power inductor 100. In other embodiments, there may be one heat sink 30, with one heat sink 30 located on either second side 112.

In this embodiment, the fixing member is a tie 53, the tie 53 surrounds the top plate 51 and the bottom plate 52, and the top plate 51 and the bottom plate 52 are fastened, so that the magnetic core top cover 12 and the magnetic core bottom cover 13 are fastened on the magnetic core upright 11, and the structural stability of the power inductor 100 is enhanced.

Referring to fig. 8, in an embodiment of the present application, there are two magnetic core pillars 11, two magnetic core pillars 11 are parallel and fixed between the magnetic core top cover 12 and the magnetic core bottom cover 13 at intervals, one winding 20 is sleeved on each magnetic core pillar 11, and one heat dissipation member 30 is disposed on each winding 20, and the heat dissipation members 30 on the two windings 20 respectively face away from the two magnetic core pillars 11. In this embodiment, two magnetic core columns 11 are provided, and each magnetic core column 11 is sleeved with one winding 20, so that magnetic fluxes generated by the two windings 20 can be mutually superposed, thereby increasing the inductance of the power inductor 100. The two heat dissipation members 30 may dissipate heat for the two windings 20, respectively, thereby increasing the heat dissipation efficiency of the power inductor 100.

In this embodiment, the fixing member includes four screws 54, four screws 51 are respectively fixed on the edges of the bottom plate 52, and two ends of each screw 54 are respectively fixed on the top plate 51 and the bottom plate 52 to fix the top plate 51 and the bottom plate 52, so that the magnetic core top cover 12 and the magnetic core bottom cover 13 are limited between the top plate 51 and the bottom plate 52 to be fastened on the magnetic core upright 11, thereby enhancing the structural stability of the power inductor 100.

Specifically, two magnetic core columns 11 are a first magnetic core column 111 and a second magnetic core column 112, respectively, and a space 2 is formed between the first magnetic core column 111 and the second magnetic core column 112. The winding 20 includes a first winding 22 and a second winding 23. The first winding 22 is sleeved on the outer peripheral surface of the first magnetic core upright post 111, and the second winding 23 is sleeved on the outer peripheral surface of the second magnetic core upright post 112.

The heat sink 30 includes a first heat sink 31 and a second heat sink 32, the first heat sink 31 being disposed on the first winding 22, and the second heat sink 32 being disposed on the second winding 23. The structures of the first heat sink 31 and the second heat sink 32 are the same as those of the heat sink 30 in the first embodiment. In one embodiment, the body 32 of the first heat sink 31 is attached to the outer peripheral surface of the first winding 22, and the heat dissipation fins of the first heat sink 31 are inserted into the gap 1 from the outer peripheral surface of the first winding coil 21. The body of the second heat sink 32 is attached to the outer peripheral surface of the second winding 23, and the heat dissipation fins of the second heat sink 32 are inserted into the gap 1 from the outer peripheral surface of the second winding coil 21.

In this embodiment, the heat generated by the first magnetic core column 111 and the first winding 22 is transferred to the first heat sink 31, and is dissipated by the first heat sink 31, and the heat generated by the second magnetic core column 112 and the second winding 23 is transferred to the second heat sink 32, and is dissipated by the second heat sink 32.

The same heat dissipation structure as that in the first embodiment may also be disposed on the body to increase the heat dissipation area of the heat dissipation member 30, thereby increasing the heat dissipation efficiency of the power inductor 100.

In one embodiment, the body of the first heat sink 31 is attached to the inner peripheral surface of the first winding coil 21, and the heat dissipation fins of the first heat sink 31 are inserted into the gap 1 from the inner peripheral surface of the first winding 22 and extend out of the first winding 22 through the outer peripheral surface of the first winding 22. The body of the second heat sink 32 is attached to the inner peripheral surface of the second winding 23, and the heat dissipation fins 33 of the second heat sink 32 are inserted into the gap 1 from the inner peripheral surface of the second winding 23 and extend out of the second winding 23 through the outer peripheral surface of the second winding 23.

In one embodiment, the magnetic core 10 further includes a core leg 15, the core leg 15 is fixed between the core top cover 12 and the core bottom cover 13, and the core leg 15 is located between the two core pillars 11 and spaced apart from the core pillars 11. Specifically, the core center leg 15 is located within the distance 2 between the first core leg 111 and the second core leg 112. In the present embodiment, the core center leg 15 is provided between the two core legs 11, so that the core center leg 15 further restrains the inductance generated by the energization of the winding 20 around the power inductor 100, thereby further increasing the inductance generated by the winding coil 21.

Referring to fig. 9, in an embodiment of the present application, the power inductor 100 further includes an auxiliary heat sink 60, the auxiliary heat sink 60 includes an auxiliary body 61, the auxiliary body 61 includes two side surfaces facing opposite directions, a plurality of auxiliary heat dissipation fins 62 are convexly disposed on each side surface, and the plurality of auxiliary heat dissipation fins 62 on each side surface are arranged at intervals along the first direction X. The auxiliary heat sink 60 is located between the two core legs 11, and the auxiliary heat sink fins 62 on each side surface are inserted into the gaps of the windings 20 of the core legs 11 adjacent thereto.

In the present embodiment, by providing the auxiliary heat sink 60 such that the heat generated by the winding 20 can be dissipated through the heat sink 30 and the auxiliary heat sink 60 at the same time, the heat dissipation efficiency of the power inductor 100 is further increased.

Specifically, a part of the heat generated by the winding 20 may be transmitted to the auxiliary heat dissipation fins 62 in contact therewith, and then transmitted to the outside by the auxiliary heat dissipation fins 62, or transmitted to the auxiliary body 61 by the auxiliary heat dissipation fins 62, and transmitted to the outside by the auxiliary body 61, so as to further improve the heat dissipation efficiency of the power inductor 100. In one embodiment, the auxiliary body 61 is provided with a hollow structure 63 in the middle to increase the heat dissipation area of the auxiliary heat sink 60, so as to further improve the heat dissipation efficiency of the power inductor 100.

In this embodiment, the fixing member is a screw 54, and two ends of the screw 54 are respectively fixed on the top plate 51 and the bottom plate 52 to fix the top plate 51 and the bottom plate 52, so that the top core cover 12 and the bottom core cover 13 are fastened on the core column 11, and the structural stability of the power inductor 100 is enhanced.

The present application also provides an electronic device (not shown). The electronic device includes a power inductor. Specifically, the electronic device may be an inverter, a solid-state transformer, an uninterruptible power supply, a power module, or other electronic devices. Because the inductor has good heat dissipation effect, the electronic equipment comprising the power inductor cannot be affected by the heat dissipation problem of the power inductor. In addition, the power inductor of the present application is low in manufacturing cost and light in weight, and therefore, an electronic device including the power inductor can also be low in manufacturing cost and light in weight.

The above embodiments and embodiments of the present application are only examples and embodiments, and the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and all the changes or substitutions should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (17)

1. A power inductor, comprising:

the magnetic core comprises a magnetic core upright post, a magnetic core top cover and a magnetic core bottom cover, and the magnetic core top cover and the magnetic core bottom cover are respectively connected with the two axial opposite ends of the magnetic core upright post;

the winding comprises a plurality of layers of connected winding coils, the plurality of layers of winding coils are arranged along a first direction, a gap is formed between every two adjacent winding coils in at least part of the winding coils, the first direction is the length direction of the winding and is the same as the axial direction of the magnetic core upright column,

the heat dissipation part comprises a heat dissipation part, the heat dissipation part is arranged on the winding, and the heat dissipation part is in insertion fit with at least one gap so that a winding coil forming the gap is in contact with the heat dissipation part;

the winding is sleeved on the peripheral surface of the magnetic core upright post and is insulated from the magnetic core upright post, the winding coil surrounds the magnetic core upright post, and the heat dissipation part is connected between the magnetic core top cover and the magnetic core bottom cover.

2. The power inductor according to claim 1, wherein the heat dissipating member comprises a body, the heat dissipating member comprises a plurality of heat dissipating fins protruding from a side surface of the body and arranged at intervals along the first direction, the plurality of heat dissipating fins are in one-to-one correspondence with the gaps, and each heat dissipating fin is inserted into the corresponding gap; the two ends of the body in the length direction are respectively connected with the magnetic core top cover and the magnetic core bottom cover, and the length direction of the body is the same as the first direction.

3. The power inductor according to claim 2, wherein a thickness of a plurality of the heat dissipating fins is the same in the first direction, and a distance between every two adjacent heat dissipating fins is the same as a thickness of the winding coil in the first direction.

4. The power inductor according to claim 2, wherein the plurality of fins includes a first fin and a second fin, the second fin is located at a middle position of the body, and a thickness of the second fin is greater than a thickness of the first fin in the first direction.

5. The power inductor according to claim 2, wherein the heat dissipation portion further comprises a heat dissipation structure located outside the winding coil, and the heat dissipation structure is protruded on another side surface of the body opposite to the heat dissipation fins, or the heat dissipation structure is protruded on end portions of the heat dissipation fins.

6. The power inductor of claim 2, wherein the outer surfaces of the body and the heat dissipating fins are coated with a heat dissipating coating.

7. The power inductor according to claim 1, wherein the heat sink is made of a metal material and an insulating layer is wrapped on an outer surface of the metal material, or the heat sink is made of an insulating material.

8. The power inductor according to any one of claims 2-7, wherein a plurality of layers of the winding coil are formed with an outer circumferential surface and an inner circumferential surface, the body is attached to the outer circumferential surface of the winding coil, and the heat dissipation fins are inserted into the gaps from the outer circumferential surface of the winding coil; or the body is attached to the inner peripheral surface of the winding coil, and the radiating fins are inserted into the gap from the inner peripheral surface of the winding coil and extend out of the winding through the outer peripheral surface.

9. The power inductor according to claim 8, wherein two of the heat dissipating elements are disposed on the winding, the heat dissipating elements are disposed on opposite sides of the winding, the magnetic core further includes two magnetic core side posts, the magnetic core side posts are fixed between the magnetic core top cover and the magnetic core bottom cover, the two magnetic core side posts are respectively disposed on two opposite first sides of the magnetic core vertical post and spaced apart from the magnetic core vertical post, the heat dissipating elements are disposed on two opposite second sides of the magnetic core vertical post, and the first sides and the second sides are disposed in different directions.

10. The power inductor according to claim 8, wherein there are two magnetic core pillars, two magnetic core pillars are fixed in parallel and spaced between the magnetic core top cover and the magnetic core bottom cover, one winding is sleeved on each magnetic core pillar, and one heat sink is provided on each winding, and the heat sinks on the two windings face away from the two magnetic core pillars respectively.

11. The power inductor as recited in claim 10, wherein said core further comprises a core leg, said core leg being secured between said core top cap and said core bottom cap, said core leg being disposed between two of said core legs and spaced from said core legs.

12. The power inductor according to claim 10, further comprising an auxiliary heat sink, the auxiliary heat sink comprising an auxiliary body, the auxiliary body comprising two oppositely facing side surfaces, each side surface having a plurality of auxiliary heat fins protruding therefrom, the plurality of auxiliary heat fins on each side surface being spaced apart from each other along the first direction; the auxiliary heat dissipation member is located between the two magnetic core columns, and the auxiliary heat dissipation fins on each side surface are inserted into gaps of windings of the magnetic core columns adjacent to the auxiliary heat dissipation fins.

13. The power inductor according to any one of claims 9 to 12, wherein the body is in contact with an outer circumferential surface of the core leg, or a free end portion of the heat dissipating fin is in contact with an outer circumferential surface of the core leg.

14. The power inductor according to claim 2, wherein the end portions of the heat dissipating fins have a contour conforming to the contour of the outer peripheral surface of the core leg; or the outline of the side surface of the body, on which the radiating fins are convexly arranged, is consistent with the outline of the winding coil.

15. The power inductor according to claim 9, wherein when the heat dissipating fins are inserted into the gap from the outer peripheral surface of the coil winding, the ends of the heat dissipating fins are in contact with the surface of the core leg with a space between the winding and the core leg, and the heat dissipating fins at both ends of the heat dissipating member are in contact with the surfaces of the core top cover and the core bottom cover to insulate the winding from the core.

16. The power inductor of claim 1, further comprising a top plate, a bottom plate, and a fixing member, wherein the top plate is fixed to a surface of the core top cover facing away from the core pillars, the bottom plate is fixed to a surface of the core bottom cover facing away from the core pillars, and the fixing member is used for fixing the top plate and the bottom plate relative to each other.

17. An electronic device comprising a power inductor according to any one of claims 1-16.

Images