阅读说明：本技术 磁性功率器件和应用其的电源模块 (Magnetic power device and power module applying same ) 是由 张希俊 李佳 姚军 高超 高强 李志涛 于 2021-08-26 设计创作，主要内容包括：本申请提供一种磁性功率器件,包括印刷电路板和装配在所述印刷电路板上的磁芯。所述磁芯包括磁芯本体和多个散热齿。所述磁芯本体与所述印刷电路板结合。所述多个散热齿凸设在所述磁芯本体背离所述印刷电路板的外表面上。所述多个散热齿与所述磁芯本体为直接接触结合。本申请还提供该种应用该磁性功率器件的电源模块。所述散热齿的设计增大了所述磁芯的表面散热面积,提升散热能力；由于所述磁芯本体的至少局部结合在所述印刷电路板上,如此所述印刷电路板的热量可传导至磁芯,通过磁芯将热量散发出去。(The application provides a magnetic power device, which comprises a printed circuit board and a magnetic core assembled on the printed circuit board. The magnetic core includes magnetic core body and a plurality of heat dissipation tooth. The magnetic core body is combined with the printed circuit board. The plurality of radiating teeth are convexly arranged on the outer surface of the magnetic core body deviating from the printed circuit board. The plurality of heat dissipation teeth and the magnetic core body are combined in a direct contact mode. The application also provides a power module applying the magnetic power device. The design of the heat dissipation teeth increases the surface heat dissipation area of the magnetic core and improves the heat dissipation capacity; because the at least part of magnetic core body combines in on the printed circuit board, so printed circuit board's heat can be conducted to the magnetic core, gives off heat through the magnetic core.)

1. A magnetic power device, comprising:

a printed circuit board;

the assembly is in magnetic core on the printed circuit board, the magnetic core includes magnetic core body and a plurality of heat dissipation tooth, the magnetic core body with printed circuit board combines, a plurality of heat dissipation tooth are protruding to be established the magnetic core body deviates from on at least one surface of printed circuit board, a plurality of heat dissipation teeth with the magnetic core body combines for direct contact.

2. The magnetic power device of claim 1, wherein the core body includes a first core portion and a second core portion connected to each other, the first core portion includes a main body portion and at least one support portion connected to a surface of the main body portion, the support portion is combined with the second core portion through the printed circuit board; the printed circuit board is positioned between the main body part and the second magnetic core part; the plurality of radiating teeth are convexly arranged on the outer surface of the first magnetic core part deviating from the printed circuit board and the outer surface of the second magnetic core part deviating from the printed circuit board.

3. The magnetic power device of claim 2, wherein at least one of the first and second core portions is bonded to the printed circuit board.

4. The magnetic power device of claim 2 or 3, wherein the first core portion further comprises at least one protrusion integrally formed with the body portion, the at least one protrusion and the at least one support portion being located on a same surface of the body portion; or the surface of the second magnetic core part facing the printed circuit board is provided with at least one lug; the at least one bump is combined with the printed circuit board.

5. The magnetic power device according to any one of claims 2 to 4, wherein the first core portion and the heat dissipation teeth provided protruding on the surface of the first core portion are integrally molded using a magnetic material; the second magnetic core part and the heat dissipation teeth convexly arranged on the surface of the second magnetic core part are integrally formed by adopting a magnetic material.

6. The magnetic power device according to any of claims 2 to 5, wherein the magnetic core is one of a UI-type core, EE-type core, EI-type core, UU-type core.

7. The magnetic power device according to any of claims 1 to 6, wherein each heat dissipation tooth extends in an elongated shape, and a plurality of heat dissipation teeth on the same outer surface are parallel and spaced from each other.

8. The magnetic power device according to any of claims 1 to 7, wherein a thermally conductive interface material is provided between the interfaces at which the magnetic core body and the printed circuit board are connected.

9. The magnetic power device according to any one of claims 1 to 8, wherein a width of each heat dissipation tooth perpendicular to the extending direction is 2mm or more.

10. The magnetic power device according to any one of claims 1 to 9, wherein a distance between two adjacent heat dissipation teeth on the same outer surface is 1mm or more.

11. The magnetic power device according to any one of claims 1 to 10, wherein a height of each heat dissipation tooth perpendicular to the outer surface thereof is 2mm or less.

12. The magnetic power device according to any of claims 1 to 10, characterized in that the printed circuit board has windings integrated therein.

13. A power supply module comprising a substrate and a magnetic power device according to any one of claims 1 to 12 disposed on the substrate, the substrate being a circuit board.

14. The power module as claimed in claim 13, wherein the printed circuit board is vertically inserted on the substrate.

15. The power module of claim 13, further comprising a heat sink fan disposed on the substrate, the heat sink fan being located at one end of the magnetic power device.

16. The power module as claimed in claim 15, wherein the heat dissipation teeth of the magnetic power device extend in an elongated shape and in a direction consistent with an air channel direction of the heat dissipation fan.

Technical Field

The application relates to a magnetic power device and a power module applying the same.

Background

With the continuous improvement of power density of power supply products, the working temperature of magnetic power devices such as transformers and inductors is higher and higher, but the space for heat dissipation in the magnetic power devices is smaller and smaller, and new challenges are provided for heat dissipation measures of the magnetic power devices. One way of dissipating heat is to bond a heat sink to the magnetic power device, specifically, to bond the heat sink to the magnetic core for heat dissipation by using glue with a good thermal conductivity. However, this way of heat dissipation has the following disadvantages: (1) material cost: if the bonding area is large, the consumption of the required heat-conducting glue is large, and the cost is high; (2) applicable scenarios are as follows: the radiator has the risk of falling off under severe environments such as outdoor temperature change, high humidity and the like; (3) the process difficulty is as follows: the bonding radiator needs the heat conduction glue of specific kind, otherwise has the risk because of the great fracturing magnetic core of heat conduction glue coefficient of thermal expansion, still needs to trade off between the heat conductivility of heat conduction glue and bonding ability in addition. Another way of dissipating heat is to arrange a thermal pad between the magnetic core and the housing of the product, and then dissipate the heat from the housing through the thermal pad. However, this way of heat dissipation has the following disadvantages: (1) material cost: the cost of the heat conducting pad is continuously increased along with the increase of the thickness; (2) applicable scenarios are as follows: the scene that the magnetic core is far away from the shell is difficult to cover; (3) the process difficulty is as follows: the size tolerance of the magnetic core and the shell is highly required, and when the thickness of the heat conducting pad is smaller, the contact between the magnetic core and the heat radiating shell is not tight enough, and the heat radiating effect is poor; when the thickness of the heat conducting pad is too large, the magnetic core and the shell bear large stress after assembly is completed, and risks such as cracking and deformation occur.

Disclosure of Invention

A first aspect of an embodiment of the present application provides a magnetic power device, including:

a printed circuit board;

the assembly is in magnetic core on the printed circuit board, the magnetic core includes magnetic core body and a plurality of heat dissipation tooth, the magnetic core body with printed circuit board combines, a plurality of heat dissipation tooth are protruding to be established the magnetic core body deviates from on at least one surface of printed circuit board.

The design of the heat dissipation teeth of the magnetic core increases the surface heat dissipation area of the magnetic core, and improves the heat dissipation capacity; the magnetic core can be connected with the shell without being additionally bonded with a radiator or provided with a heat conducting pad, so that the volume occupied by the magnetic power device is effectively reduced; because the magnetic core body combines on the printed circuit board, so printed circuit board's heat can be conducted to the magnetic core, gives off the heat through the magnetic core.

In an embodiment of the present application, the magnetic core body includes a first magnetic core portion and a second magnetic core portion connected to each other, the first magnetic core portion includes a main body portion and at least one supporting portion connected to a surface of the main body portion, and the supporting portion is combined with the second magnetic core portion through the printed circuit board; the printed circuit board is positioned between the main body part and the second magnetic core part; the plurality of radiating teeth are convexly arranged on the outer surface of the first magnetic core part deviating from the printed circuit board and the outer surface of the second magnetic core part deviating from the printed circuit board.

Generally, the first magnetic core part and the second magnetic core part of the magnetic core body are respectively formed, the first magnetic core part and the second magnetic core part are respectively placed on two sides of the printed circuit board during assembly, the magnetic core body can be simply and rapidly assembled on the printed circuit board, and an adhesive can be arranged on a bonding interface of the supporting part and the second magnetic core part so that the first magnetic core part and the second magnetic core part are firmly bonded.

In an embodiment of the present application, at least one of the first core portion and the second core portion is combined with the printed circuit board.

In an embodiment of the present application, the first core portion further includes at least one protrusion integrally formed with the main body portion, and the at least one protrusion and the at least one supporting portion are located on the same surface of the main body portion; or the surface of the second magnetic core part facing the printed circuit board is provided with at least one lug; the at least one bump is combined with the printed circuit board.

The number of the bumps may be plural to ensure a contact area of the first core portion with the printed circuit board. The thickness of each bump is smaller than that of the support part so that the bump can be bonded on the printed circuit board. In this way, heat generated by the printed circuit board, and particularly by the windings, can be conducted through the bumps to the core and dissipated through the core.

In the embodiment of the application, the first magnetic core part and the heat dissipation teeth convexly arranged on the surface of the first magnetic core part are integrally formed by adopting a magnetic material; the second magnetic core part and the heat dissipation teeth convexly arranged on the surface of the second magnetic core part are integrally formed by adopting a magnetic material.

In the embodiment of the application, the magnetic core is one of a UI type magnetic core, an EE type magnetic core, an EI type magnetic core and a UU type magnetic core.

In the embodiment of the application, each heat dissipation tooth extends to be in a long strip shape, and a plurality of heat dissipation teeth on the same outer surface are parallel to each other and are spaced.

The strip-shaped grooves are formed between two adjacent heat dissipation teeth on the same outer surface, the extending direction of the strip-shaped grooves of the heat dissipation teeth is generally along the direction of the air duct, and if the extending direction of the heat dissipation teeth is not consistent with the extending direction of the strip-shaped grooves of the heat dissipation teeth, the flowing speed of air can be reduced, and the heat dissipation effect is reduced.

In the embodiment of the application, a heat conduction interface material is arranged between the magnetic core body and the interface connected with the printed circuit board.

In the embodiment of the application, the width of each heat dissipation tooth perpendicular to the extending direction is greater than or equal to 2 mm.

In the embodiment of the application, the distance between two adjacent heat dissipation teeth on the same outer surface is greater than or equal to 1 mm.

In the embodiment of the application, the height of each heat dissipation tooth perpendicular to the outer surface where the heat dissipation tooth is located is less than or equal to 2 mm.

In the embodiment of the application, the printed circuit board is integrated with a winding.

A second aspect of the embodiments of the present application provides a power module, including a substrate and a magnetic power device disposed on the substrate according to the first aspect of the embodiments of the present application, where the substrate is a circuit board.

In the embodiment of the present application, the printed circuit board is vertically inserted on the substrate.

The magnetic power device is characterized in that a plurality of bulges are formed on one end face of a printed circuit board of the magnetic power device, the printed circuit board can be inserted into the substrate through the bulges and is provided with insertion holes corresponding to the substrate, the printed circuit board can be inserted into the insertion holes of the substrate through the bulges, and the printed circuit board is electrically connected with the substrate.

In the embodiment of the present application, the power module further includes a heat dissipation fan disposed on the substrate, and the heat dissipation fan is located at one end of the magnetic power device.

In the embodiment of the present application, the heat dissipation teeth of the magnetic power device extend in a long strip shape, and the extending direction is consistent with the air duct direction of the heat dissipation fan.

The substrate is provided with a plurality of magnetic power devices arranged at intervals, and the printed circuit boards of the magnetic power devices are arranged oppositely and in parallel. The heat radiation fan is positioned at the same end of the plurality of magnetic power devices. The air blown out by the cooling fan blows towards the two magnetic power devices, the air channel direction is consistent with the extending direction of the cooling teeth of the magnetic power devices, the flowing air blown out by the cooling fan quickly takes away heat generated on the surface of the magnetic core, the cooling effect is good, and high-temperature damage to equipment is avoided.

Drawings

Fig. 1A is a schematic perspective view of a magnetic power device according to an embodiment of the present application.

Fig. 1B is a side schematic view of the magnetic power device of fig. 1A.

Fig. 2 is an exploded schematic view of the magnetic power device of fig. 1.

Fig. 3 is a perspective view of a magnetic core of the magnetic power device of fig. 1.

Fig. 4 is a partial schematic view of a magnetic core.

Fig. 5A to 5C are schematic plan views of magnetic cores of three modified embodiments.

Fig. 6 is a perspective view of a power module.

Description of the main elements

Magnetic power device 100

Magnetic core 10

Printed circuit board 30

Magnetic core body 11

Heat dissipation teeth 13

Groove 130

First core part 111

Second core portion 113

Main body 112

Supporting part 114

Through hole 31

Bump 116

Smooth zone 110

Power supply module 200

Substrate 210

Heat radiation fan 40

Projection 101

Detailed Description

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

Magnetic power devices, such as transformers, inductors, and the like, include a magnetic core of magnetic material. However, the existing way of dissipating heat of the magnetic power device is to bond the heat sink on the magnetic power device by glue, which results in that the overall structure of the magnetic power device occupies a larger space and there is a risk that the heat sink falls off.

As shown in fig. 1A and 1B, the present application provides a magnetic power device 100, which includes a magnetic core 10, wherein the magnetic core 10 has a large specific surface area, so as to have a large heat dissipation area, and heat generated by the magnetic core 10 itself and heat generated by other components (such as a printed circuit board 30) can be effectively transferred through the magnetic core 10.

As shown in fig. 1A and 1B, the magnetic power device 100 further includes a printed circuit board 30, and the magnetic core 10 is mounted on the printed circuit board 30. The magnetic core 10 includes a magnetic core body 11 and a plurality of heat dissipation teeth 13 protruding on at least one outer surface of the magnetic core body 11. The magnetic core body 11 is combined with the printed circuit board 30. The plurality of heat dissipation teeth 13 are convexly disposed on at least one outer surface of the magnetic core body 11 facing away from the printed circuit board 30. A groove 130 is formed between two adjacent heat dissipation teeth 13 on the same outer surface. The design of the heat dissipation teeth 13 increases the surface heat dissipation area of the magnetic core 10, improves the heat dissipation capacity, and the magnetic core 10 can be connected with the casing without additionally bonding a heat sink or arranging a heat conduction pad, thereby effectively reducing the volume occupied by the magnetic power device 100. In this embodiment, the printed circuit board 30 has a multi-layer structure and is integrated with a winding (not shown) in a magnetic path formed by the magnetic core 10. When the magnetic power device 100 is in operation, current flows through the windings, the windings heat up and generate a large amount of heat, and therefore a heat dissipation path needs to be provided for the windings, i.e., the printed circuit board 30, or the resistivity of the windings increases.

The magnetic core 10 is made of a magnetic material, including but not limited to one of a metal magnetic material, an alloy magnetic material, and a ferrite magnetic material. In this embodiment, the heat dissipation teeth 13 and at least a part of the magnetic core body 11 are integrally formed in a mold (not shown) by using a magnetic material. The heat dissipation teeth 13 and the magnetic core body 11 are in direct contact combination, and no medium (such as an adhesive) is arranged between the two to play a role in bonding, so that the risk that the heat dissipation teeth 13 fall off due to failure of the adhesive is avoided, heat can be directly conducted to the heat dissipation teeth 13 from the magnetic core body 11, and the heat dissipation efficiency is high.

In addition, since the magnetic core body 11 is combined on the printed circuit board 30, the heat of the printed circuit board 30 can be conducted to the magnetic core 10 through the magnetic core body 11, and the heat can be dissipated through the magnetic core 10.

As shown in fig. 2 and 3, the magnetic core body 11 includes a first magnetic core portion 111 and a second magnetic core portion 113 connected to each other, and the printed circuit board 30 is located substantially between the first magnetic core portion 111 and the second magnetic core portion 113. Typically, the first core portion 111 and the second core portion 113 are formed separately. The first magnetic core portion 111 includes a main body portion 112 and at least one supporting portion 114 protruding from a surface of the main body portion 112, and the main body portion 112 and the supporting portion 114 are integrally formed. In some embodiments, the main body 112 is a flat plate, and the supporting portion 114 is a substantially cylindrical shape. The printed circuit board 30 is provided with at least one through hole 31 penetrating through the printed circuit board 30, and each through hole 31 corresponds to one support part 114. Each of the supporting portions 114 passes through a corresponding one of the through holes 31 to be coupled with the second core portion 113. In the present application, the first core portion 111 has the structure described above, but there is no particular requirement for the structure of the second core portion 113 (for example, a plate-shaped mirror image structure symmetrical to the first core portion 111 may be used, and the structure is not limited thereto), as long as the printed circuit board 30 can be connected to the first core portion 111 and clamped between the first core portion 111 and the second core portion 113. An adhesive (not shown) may be disposed at a bonding interface of the supporting portion 114 and the second core portion 113 to firmly bond the first core portion 111 and the second core portion 113. The printed circuit board 30 is located between the main body portion 112 and the second core portion 113. The opening size of the through hole 31 is larger than the cross-sectional size of the support part 114, so that the support part 114 can easily pass through the through hole 31 during the assembly process.

As shown in fig. 2, the plurality of heat dissipation teeth 13 are protruded on the outer surface of the first core portion 111 facing away from the printed circuit board 30 and the outer surface of the second core portion 113 facing away from the printed circuit board 30. The first magnetic core part 111 and the heat dissipation teeth 13 convexly arranged on the first magnetic core part are integrally formed; the second core portion 113 and the heat dissipation teeth 13 protruding therefrom are integrally formed. At least one of the first core portion 111 and the second core portion 113 is combined with the printed circuit board 30.

As shown in fig. 2 and 3, in this embodiment, the magnetic core 10 may be a UI-type magnetic core, the first magnetic core portion 111 is substantially U-shaped, and the second magnetic core portion 113 is flat-plate-shaped I-shaped. The first core portion 111 includes a flat plate-shaped main body portion 112 and two support portions 114 provided at an interval on the same surface of the main body portion 112. Each support portion 114 has a cylindrical shape. The printed circuit board 30 is provided with two through holes 31 penetrating through the printed circuit board 30, and each through hole 31 corresponds to one support portion 114. Each of the supporting portions 114 passes through a corresponding one of the through holes 31 to be in contact-coupled with the second core portion 113. In this embodiment, the second core portion 113 and the printed circuit board 30 are spaced apart from each other. The outer surface of the first magnetic core portion 111 facing away from the printed circuit board 30 is convexly provided with heat dissipation teeth 13, the outer surface of the second magnetic core portion 113 facing away from the printed circuit board 30 is also convexly provided with heat dissipation teeth 13, and two opposite surfaces of the magnetic core body 11 are respectively provided with a plurality of heat dissipation teeth 13. Since the two outer surfaces are surfaces of the magnetic core body 11 that are in large-area contact with the outside air, the two outer surfaces are selected as surfaces on which the heat dissipation teeth 13 are located. The heat dissipation teeth 13 are not disposed on the surface of the second core portion 113 close to the printed circuit board 30, because the second core portion 113 and the printed circuit board 30 are spaced apart from each other, but the gap between the two is small, the formed air duct is limited, and the heat dissipation effect is not good. In addition, in the present application, a part of the first magnetic core portion 111 is coupled to the printed circuit board 30, and the first magnetic core portion 111 further includes at least one protrusion 116 integrally formed with the main body portion 112, and the protrusion 116 is directly coupled to the printed circuit board 30. In this embodiment, the number of the bumps 116 is three. The number of the bumps 116 is plural to secure a bonding contact area of the first core portion 111 and the printed circuit board 30. The protrusion 116 and the two supporting portions 114 are located on the same surface of the main body 112, and the protrusion 116 is spaced apart from the two supporting portions 114. The thickness of each bump 116 is smaller than that of the supporting portion 114 so that the bump 116 can be bonded to the printed circuit board 30. In this way, heat generated from the printed circuit board 30, particularly from the windings, can be conducted to the first core portion 111 through the bumps 116, and dissipated through the core 10.

It is understood that, in other embodiments, although not shown, the second core portion 113 may also include a bump 116 to achieve the combination with the printed circuit board 30.

It is understood that the magnetic core 10 of the magnetic power device 100 is not limited to the UI type magnetic core, and may be other magnetic cores. As shown in fig. 5A, the magnetic core 10 is a UU type magnetic core or the like. That is, the first core portion 111 and the second core portion 113 are each U-shaped. The first core portion 111 and the second core portion 113 each include a flat plate-shaped main body portion 112 and two support portions 114 located on the same surface of the main body portion 112 and spaced apart from each other. Correspondingly, although not shown, the printed circuit board is provided with two through holes for the two supporting portions 114 of the first core portion 111 to respectively pass through so as to be combined with the two supporting portions 114 of the second core portion 113. Similarly, although not shown, the first core portion 111 or the second core portion 113 further includes a bump integrally formed with the main body portion 112, and the first core portion or the second core portion is coupled to the printed circuit board 30 by the bump.

As shown in fig. 5B, the magnetic core 10 is an EE-type magnetic core, and the first core portion 111 and the second core portion 113 are both E-shaped. The first core portion 111 and the second core portion 113 each include a flat plate-shaped main body portion 112 and three support portions 114 provided at intervals on the same surface of the main body portion 112. The three support portions 114 of the first core portion 111 and the three support portions 114 of the second core portion 113 are coupled in a one-to-one correspondence. Correspondingly, although not shown, the printed circuit board is provided with three through holes for the three supporting portions 114 of the first core portion 111 to pass through respectively so as to be combined with the three supporting portions 114 of the second core portion 113 respectively. Similarly, although not shown, the first core portion 111 or the second core portion 113 further includes a bump integrally formed with the main body portion 112, and the first core portion or the second core portion is coupled to the printed circuit board 30 by the bump.

As shown in fig. 5C, the magnetic core 10 is an EI type magnetic core. That is, the first core portion 111 has an E-shape, and the second core portion 113 has a flat plate-like I-shape. The first core portion 111 includes a flat plate-shaped main body portion 112 and three support portions 114 provided at intervals on the same surface of the main body portion 112. Correspondingly, although not shown, the printed circuit board is provided with three through holes for the three supporting portions 114 of the first core portion 111 to respectively pass through so as to be combined with the second core portion 113. Also, although not shown, the first core portion 111 or the second core portion 113 further includes a bump integrally formed with the main body portion 112 to be coupled to the printed circuit board 30 via a bump.

It is to be understood that the magnetic core 10 is not limited to the structure shown in fig. 3 and fig. 5A to 5C, and may be a magnetic core of other shapes.

It is understood that the magnetic core 10 and the printed circuit board 30 may be directly bonded in contact, or a heat conductive interface material may be disposed between the interfaces connecting the two.

It is understood that, although not shown, other electronic components, such as resistors, capacitors, etc., may be disposed on the printed circuit board 30.

As shown in fig. 4, each heat dissipation tooth 13 extends in an elongated shape. In this embodiment, the plurality of heat dissipation teeth 13 located on the same outer surface of the magnetic core body 11 are parallel to and spaced apart from each other. A strip-shaped groove 130 is formed between two adjacent heat dissipation teeth 13. The dimensions of the heat dissipation teeth 13 can be adjusted and designed according to the needs. Each heat dissipation tooth 13 has a length a in the extending direction, a width b perpendicular to the extending direction, a height c perpendicular to the outer surface of the core body, and a pitch d of adjacent heat dissipation teeth 13.

An air-cooled heat dissipation device, such as a heat dissipation fan, is usually disposed beside the magnetic power device 100 to quickly remove heat generated by the magnetic core 10 and the printed circuit board 30 through flowing air, so that the heat dissipation effect is good and the device is prevented from being damaged by high temperature. The length a of the heat dissipation teeth 13 is generally oriented along the air path. The extending direction of the heat dissipation teeth 13 on the surface of the magnetic core 10 and the air flowing direction are designed to be consistent, and if they are inconsistent, the air flowing rate is reduced, and the heat dissipation effect is greatly reduced.

The length a of the cooling teeth 13 is generally equal to the overall length L of the core. However, in the present embodiment, as shown in fig. 4, the heat dissipation teeth 13 are provided only on two side portions of the outer surface of the magnetic core body 11 provided with the heat dissipation teeth 13, and a smooth region 110 with a smooth surface is provided in the middle of the two side portions. Smooth district 110 sets up and is located the automated processing equipment of being convenient for during magnetic power device 100, make the adsorption nozzle can adsorb thereby it snatchs to realize automaticly in smooth district the magnetic core. In this embodiment, the surface of the heat dissipation teeth 13 away from the magnetic core body 11 and the smooth area are parallel and level, so that the difficulty in molding the magnetic core 10 can be reduced. It can be understood that, in practical applications, whether the heat dissipation teeth 13 are disposed on the entire outer surface or on a part of the outer surface can be determined according to requirements.

In the case where the length L and the width M of the core itself are determined, the width b of the heat dissipation teeth 13 and the distance d between the heat dissipation teeth 13 together determine the number n of heat dissipation teeth 13 on one outer surface of the core, where n is M/(b + d). The smaller the sum of the width b of the heat dissipation teeth 13 and the distance d between the heat dissipation teeth 13, the larger the number n of the heat dissipation teeth 13. The number n of the heat dissipation teeth 13, together with the height c and the length a of the heat dissipation teeth 13, determines the increased heat dissipation area S of the magnetic core, which is c × a × 2 n. Based on the consideration of increasing the heat dissipation area, theoretically, the larger the length a and the height c, the better, and the smaller the width b and the distance d, the better. But is limited by the molding process capability of the mold, and in order to ensure mass production, the width b of each heat dissipation tooth 13 perpendicular to the extending direction is greater than or equal to 2 mm. The distance between two adjacent radiating teeth 13 on the same outer surface is greater than or equal to 1 mm. The height of each heat dissipation tooth 13 perpendicular to the outer surface is less than or equal to 2 mm.

As shown in fig. 6, the present application further provides a power module 200, which includes a substrate 210 and a magnetic power device 100 disposed on the substrate 210. The power module 200 may be, but not limited to, a transformer, an inductor, etc. The magnetic power device 100 is vertically inserted on the substrate 210 by means of the printed circuit board 30. The substrate 210 itself is also a printed circuit board. In the embodiment of the present application, two magnetic power devices 100 are disposed on the substrate 210 at an interval. In this embodiment, the printed circuit boards 30 of the two magnetic power devices 100 are disposed oppositely and in parallel. The substrate 210 is further provided with a heat dissipation fan 40, and the heat dissipation fan 40 is located at the same end of the two magnetic power devices 100. The air blown out by the heat dissipation fan 40 blows towards the two magnetic power devices 100, the air channel direction is consistent with the extending direction of the heat dissipation teeth 13 of the magnetic power devices 100, the heat generated on the surface of the magnetic core 10 is quickly taken away by the flowing air blown out by the heat dissipation fan 40, the heat dissipation effect is good, and the equipment is prevented from being damaged by high temperature. As shown in fig. 2, a plurality of protrusions 101 are formed on an end surface of the printed circuit board 30 of the magnetic power device 100, and a plugging hole (not shown) is formed on the substrate 210, the printed circuit board 30 can be plugged into the plugging hole of the substrate 210 through the protrusions 101 to realize the fixed connection between the printed circuit board 30 and the substrate 210, and the printed circuit board 30 is electrically connected to the substrate 210.

And (3) verifying simulation data of the heat dissipation effect:

two magnetic cores with the same size are selected to be applied to two transformers with the same size and specification, the length, the width and the thickness of the two magnetic cores are the same, and different positions are that one magnetic core is provided with heat dissipation teeth, and the other magnetic core is not provided with the heat dissipation teeth and serves as a comparative example. According to thermal simulation data, compared with a comparative example, the temperature of a PCB winding of the planar transformer formed by the magnetic core provided with the heat dissipation teeth is reduced by 4.4 ℃; the core body temperature is reduced by 11 ℃.

This application distinguishes the prior art improvements:

(1) material cost: additional materials such as a radiator, adhesive glue, a heat conducting pad and the like are not needed, and the material cost is reduced.

(2) Applicable scenarios are as follows: the heat dissipation teeth of the magnetic core can be matched with the magnetic core body and the environment to carry out free size design; the magnetic core is integrally formed with the magnetic core, so that the risk that the heat dissipation part falls off and the heat dissipation performance is reduced after long-term work is avoided.

(3) The process difficulty is as follows: the magnetic core radiating teeth can be manufactured at one time by opening the die, and the method is suitable for large-scale mass production; need not the later stage and carry out the secondary design of other materials to the magnetic core size, consider the assembly scheme, reduced manufacturing cost.

(4) Volume advantage: the magnetic power device does not need to be additionally provided with materials such as a radiator, adhesive and a heat conducting pad, so that the whole occupied space is small, and the miniaturization of the power module is facilitated.

It should be noted that the above is only a specific embodiment of the present application, but 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 should be covered by the scope of the present application; in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.