CN217064385U - Power module and power device - Google Patents

Abstract

The utility model discloses a power module and a power device. The power device includes screws, cooling elements and power modules. The power module includes a substrate, a package and two fixing structures. Each fixing structure includes a first through hole, two arc-shaped second through holes, a ring structure and two sinking structures. The annular structure is between the first through hole and the two second through holes. Two sinking structures are connected with the ring structure. The two screws pass through the two first through holes, and when the power module is fixed to the heat dissipation element, each sinking structure is bent toward the heat dissipation element, and each annular structure is fixed to the flat surface of the heat dissipation element by the screws. Through the design of the two fixed structures, the heat dissipation surface of the substrate can be flatly attached to the flat surface of the heat dissipation element, so that the heat energy generated by the operation of the power module can be effectively transferred to the outside through the heat dissipation element.

Description

Power modules and power devices

technical field

The utility model relates to a power module and a power device, in particular to a power module and a power device suitable for application in high power.

Background technique

Existing high-power power modules generate a large amount of heat energy during operation. Therefore, a heat dissipation element must be connected to one side of the power module, so that a large amount of heat energy generated during the operation of the power module can pass through the heat dissipation element. pass out. Generally speaking, this kind of power module is fastened to the heat dissipation element by means of screws. In practice, power modules that are fixed to the heat dissipation element with screws are often used. Due to various factors (for example, the screws cannot effectively connect the power module and the heat dissipation element closely, etc.), the heat dissipation element cannot be effectively passed through. A large amount of heat energy generated is transferred outward.

Utility model content

The utility model discloses a power module and a power device, which are mainly used to improve the existing common power modules. When the power module is fastened to the relevant heat-dissipating element by screws, the heat-dissipating surface of the power module cannot be effectively flatly attached to the surface of the heat-dissipating element. , resulting in a large amount of heat energy generated during the operation of the power module, which cannot be effectively exported through the heat dissipation element.

One of the embodiments of the present invention discloses a power module, which includes a substrate, one side of which is provided with at least one electronic component, and the other side of the substrate is a heat dissipation surface; On the side with the electronic components, the heat dissipation surface is exposed to the package body; a plurality of pins, one end of each pin is fixed to the substrate, and the other end of each pin goes out of the package body; two fixing structures are arranged on each other in the package body Opposite ends; each fixing structure includes: a first through hole, which penetrates the fixing structure; at least two second through holes, each of which penetrates through the fixing structure, and at least two second through holes are centered on the first through hole and are located in the second through hole. Two sides of a perforation, and at least two second perforations are arranged facing each other; each second perforation is arc-shaped; an annular structure is located between the at least two second perforations and the first perforation; two lower perforations The sinking structure is located on both sides of the annular structure, each sinking structure is connected with the annular structure, and a sinking structure is formed between one end of each second through hole and one end of another second through hole; wherein, the power module When fixed on a heat dissipation element by two screws, a stud of each screw will pass through the first through hole, and a head of each screw will press against the corresponding annular structure, and make the annular structure flat against the heat dissipation a flat surface of the component.

Preferably, each first through hole is a circular hole, the center of each first through hole is located on the same axis, and each sink structure is located on the axis.

Preferably, the two sinking structures of each fixing structure are respectively defined as an inner sinking structure and an outer sinking structure, the inner sinking structure is arranged close to the package body, the outer sinking structure is arranged away from the packaging body, and each fixing structure is It includes an auxiliary through hole, the auxiliary through hole penetrates the fixing structure, the auxiliary through hole is located between the inner subsidence structure and the package body, the diameter of the auxiliary through hole is smaller than that of the first through hole, and the center of each auxiliary through hole is located on the axis.

Preferably, each fixing structure includes four second through holes, wherein two second through holes are arranged on one side of the first through holes, the other two second through holes are arranged at the other side of the first through holes, and the two second through holes are arranged on the same side. A weakened structure is formed between the second through holes. When the power module is fixed to the heat dissipation element by two screws, each weakened structure can be squeezed and broken by the screws.

Preferably, the power module further includes a frame body, the frame body is located around the package body, and the frame body and the two fixing structures are integrally formed.

Preferably, each fixing structure includes an inner fixing portion, the package body is fixed to the two fixing structures by means of injection molding, and each inner fixing portion is covered by the packaging body.

Preferably, the two first through holes are located on an axis, each of the sunken structures is not located on the axis, and the two sunken structures of each fixed structure are located on a longitudinal line, the longitudinal lines are not parallel to the axis, and each fixed structure further includes an auxiliary through hole, The auxiliary through hole is disposed adjacent to one of the sinking structures, and the diameter of the auxiliary through hole is smaller than that of the first through hole.

One embodiment of the present invention is a power module, which includes: a substrate, one side of which is provided with at least one electronic component, and the other side of the substrate is a heat dissipation surface; a package body, which covers the substrate and is provided with electronic components On one side of the component, the heat dissipation surface is exposed to the package body; a plurality of pins, one end of each pin is fixed to the substrate, and the other end of each pin penetrates the package body; two fixing structures are arranged on the opposite sides of the package body. Both ends; each fixing structure includes: a first through hole, which penetrates the fixing structure; a second through hole, which penetrates through the fixing structure, the second through hole is arc-shaped, and the second through hole surrounds the first through hole part with the first through hole as the center Peripheral arrangement; an annular structure, which is located between the second through hole and the first through hole; a sinking structure, which is located on one side of the annular structure, and the sinking structure is located between the package body and the first through hole, and the sinking structure It is connected with the annular structure; wherein, when the power module is fixed on a heat dissipation element by two screws, a stud of each screw will pass through the first through hole, and a head of each screw will press against the corresponding annular structure , and make the annular structure flat on a flat surface of the heat dissipation element.

One embodiment of the present invention is a power device, which includes: a heat dissipation element; two screws; a heat dissipation surface; a package body, which covers the substrate and is provided with one side of the electronic components, and the heat dissipation surface is exposed to the package body; a plurality of pins, one end of each pin is fixed on the substrate, and the other end of each pin passes through the package body ; two fixing structures, which are arranged at opposite ends of the package body; each fixing structure comprises: a first through hole, which penetrates the fixing structure; at least two second through holes, each of which penetrates the fixing structure, at least two The second perforation is centered on the first perforation and is located on both sides of the first perforation, and at least two second perforations are arranged facing each other; each second perforation is arc-shaped; Between the two perforations and the first perforation; two sinking structures, which are located on both sides of the annular structure, each sinking structure is connected with the annular structure, and one end of each second perforation and one end of the other second perforation are connected. A sinking structure is formed between them; wherein, when the power module is fixed on the heat dissipation element by two screws, a stud of each screw will pass through the first through hole, and a head of each screw will press against the corresponding annular structure, and make the annular structure flat on a flat surface of the heat dissipation element.

Preferably, each first through hole is a circular hole, the center of each first through hole is located on the same axis, and each sink structure is located on the axis.

Preferably, the two sinking structures of each fixing structure are respectively defined as an inner sinking structure and an outer sinking structure, the inner sinking structure is arranged close to the package body, the outer sinking structure is arranged away from the packaging body, and each fixing structure is It includes an auxiliary through hole, the auxiliary through hole penetrates the fixing structure, the auxiliary through hole is located between the inner subsidence structure and the package body, the diameter of the auxiliary through hole is smaller than that of the first through hole, and the center of each auxiliary through hole is located on the axis.

Preferably, each fixing structure includes four second through holes, wherein two second through holes are arranged on one side of the first through holes, the other two second through holes are arranged at the other side of the first through holes, and the two second through holes are arranged on the same side. A weakened structure is formed between the second through holes. When the power module is fixed to the heat dissipation element by two screws, each weakened structure can be squeezed and broken by the screws.

Preferably, the power module further includes a frame body, the frame body is located around the package body, and the frame body and the two fixing structures are integrally formed.

Preferably, each fixing structure includes an inner fixing portion, the package body is fixed to the two fixing structures by means of injection molding, and each inner fixing portion is covered by the packaging body.

Preferably, the two first through holes are located on an axis, each of the sunken structures is not located on the axis, and the two sunken structures of each fixed structure are located on a longitudinal line, the longitudinal lines are not parallel to the axis, and each fixed structure further includes an auxiliary through hole, The auxiliary through hole is disposed adjacent to one of the sinking structures, and the diameter of the auxiliary through hole is smaller than that of the first through hole.

To sum up, in the power module and power device of the present invention, through the design of the first perforation, the second perforation, the annular structure and the two sinking structures of each fixing structure, the power module can be fixed by two screws. When the flat surface of the heat dissipation element is used, the heat dissipation surface of the power module can be flatly attached to the flat surface of the heat dissipation element, so that a large amount of heat energy generated when the power module operates can be effectively transferred to the outside through the heat dissipation element.

In order to further understand the features and technical content of the present utility model, please refer to the following detailed description and accompanying drawings of the present utility model, but these descriptions and drawings are only used to illustrate the present utility model, not to protect the present utility model. any limitation on the scope.

Description of drawings

FIG. 1 is an exploded schematic view of the power device of the present invention.

FIG. 2 is an exploded side view of the power device of the present invention.

FIG. 3 is a top view of the first embodiment of the power module of the present invention.

4 is a cross-sectional side view of the power device of the present invention.

FIG. 5 is a partial enlarged schematic view of FIG. 4 .

FIG. 6 is a top view of the second embodiment of the power module of the present invention.

FIG. 7 is a top view of the third embodiment of the power module of the present invention.

FIG. 8 is a top view of the fourth embodiment of the power module of the present invention.

9 is a top view of a fifth embodiment of the power module of the present invention.

FIG. 10 is a schematic cross-sectional view along the line X-X of FIG. 9 .

FIG. 11 is a top view of the sixth embodiment of the power module of the present invention.

Detailed ways

In the following description, if it is indicated to refer to a specific figure or as shown in a specific figure, it is only used for emphasis in the subsequent description, and most of the related content mentioned appears in the specific figure, but It is not intended that in this ensuing description, reference may be made to only the particular drawings described.

Please refer to FIG. 1 to FIG. 5 together. The power device 100 of the present invention includes a heat dissipation element 1 , two screws 2 and a power module 3 . One side of the heat dissipation element 1 has a flat surface 11 and two screw holes 12 , and the other side of the heat dissipation element 1 may include, for example, a plurality of heat dissipation fins 13 . The specific appearance of the heat dissipating element 1 is not limited to what is shown in the drawings. The heat dissipating element 1 is mainly used to export the heat energy generated when the power device 100 operates. The two screw holes 12 are used for locking the two screws 2 to fix the power module 3 on the flat surface 11 of the heat dissipation element 1 .

It should be noted that, when the power module 3 operates, a large amount of heat energy will be generated. Therefore, whether the power module 3 and the heat dissipation element 1 are closely connected will directly affect the operation efficiency of the power module 3 . That is to say, if the power module 3 is not closely connected with the heat dissipation element 1, a large amount of heat energy generated during the operation of the power module 3 cannot be effectively exported, which will directly affect the operation efficiency of the power module 3, and even, The power module 3 may be destroyed. The power device 100 of the present invention is designed through two fixing structures 35, etc., when the power module 3 is fixed to the heat dissipation element 1 by two screws 2, the power module 3 can be closely contacted with the heat dissipation element 1, and the power A large amount of heat energy generated during the operation of the module 3 can be smoothly exported through the heat dissipation element 1 , thereby improving the operation efficiency of the power module 3 .

As shown in FIGS. 1 and 2 , the power module 3 includes a substrate 31 , a plurality of pins 32 , a frame body 33 , a package body 34 and two fixing structures 35 . One side of the substrate 31 is provided with at least one electronic element 36 , and the other side of the substrate 31 is a heat-dissipating surface 311 for contacting the flat surface 11 of the heat-dissipating element 1 . The electronic components 36 may be, for example, various types of microprocessors (MICRO PROCESSOR UNIT, MPU), or electronic components such as metal oxide semiconductors (MOS), which are not limited herein.

As shown in FIG. 1 and FIG. 2 , the substrate 31 may include, for example, a ceramic substrate 312 , a wiring layer 313 , a heat dissipation layer 314 and a temperature interface layer 315 (THERAMAL INTERFACE MATERIAL LAYER). A wiring layer 313 is provided on one side of the ceramic substrate 312 , and a heat dissipation layer 314 is provided on the other side of the ceramic substrate 312 . The wiring layer 313 is connected to the electronic components 36 and the wiring layer 313 is connected to the plurality of pins 32 . The heat dissipation layer 314 is connected to the temperature interface layer 315 opposite to the side connected to the ceramic substrate 312 . The temperature interface layer 315 is exposed outside the bottom of the frame body 33 , and the temperature interface layer 315 is connected to the heat dissipation layer 314 on the opposite side. One side is the heat dissipation surface 311 . The heat dissipation layer 314 is formed of, for example, a copper material, but the surface cannot be completely smooth. Therefore, by adding a temperature interface layer 315 between the heat dissipation layer 314 and the flat surface 11 of the heat dissipation element 1, the substrate 31 and the heat dissipation element 1 can be flattened. Face 11 is in closer contact. The temperature interface layer 315 is formed of, for example, thermal paste. By making the substrate 31 include a design of various structural combinations, the heat energy generated when the power module 3 operates can be transferred to the heat dissipation element 1 more quickly.

3 is a top view of the first embodiment of the power module of the present invention. As shown in FIGS. 1 to 3 , the package body 34 is disposed in the frame body 33 , and the package body 34 covers the substrate 31 and is provided with electronic components 36 . On one side, the heat dissipation surface 311 on the other side of the substrate 31 is exposed to the package body 34 .

One end of each pin 32 is fixed on the side of the substrate 31 where the electronic components 36 are arranged, the other end of each pin 32 protrudes from the package body 34 , and each pin 32 protrudes from one end of the package body 34 for connecting with other pins 34 . The circuit boards and the like are electrically connected to each other. The number of pins 32 included in the power module 3 and the positions of the pins 32 on the substrate 31 can be designed according to requirements, and are not limited herein.

As shown in FIG. 3 , the two fixing structures 35 and the frame body 33 may be integrally formed, and both may be made of the same metal material (eg, a material with stress such as aluminum). The two fixing structures 35 are located on opposite sides of the frame body 33 , and the two fixing structures 35 are also located on opposite sides of the package body 34 . As shown in FIG. 2 , each fixing structure 35 is not flush with the heat dissipation surface 311 , and there is a height difference between each fixing structure 35 and the heat dissipation surface 311 ; as shown in FIG. 2 and FIG. When combined with the frame body 33 , the parts of the two fixing structures 35 close to the package body 34 will remain suspended, so that the material stress and angle of the fixing structures 35 can be controlled to maintain a high and stable locking effect. In practical applications, the frame body 33 can be fixed on the periphery of the substrate 31 first, and then the liquid encapsulant is injected into the cavity formed between the frame body 33 and the substrate 31. After the encapsulant is cured, the encapsulation body 34 can be formed in the cavity formed by the frame body 33 and the substrate 31 .

According to the above, by making the frame body 33 and the two fixing structures 35 integrally formed, and by injecting the encapsulant into the cavity formed by the frame body 33 and the substrate 31, the packaging body 34 and other designs can be formed according to the design. The overall manufacturing cost of the power module 3 is greatly reduced. Specifically, in the existing common power module process, the package body is manufactured by using a mold. Therefore, the cost of mold opening is required in the manufacturing cost of the existing power module. In addition, in practice, the setting positions of multiple pins on the substrate will be adjusted according to the needs of different products or customers. Therefore, relevant manufacturers must set up different molds according to different products. The manufacturing cost of the module cannot be reduced. On the other hand, in the power module 3 of the present invention, through the design of the frame body 33 and the like, no matter where the pins 32 are arranged, the manufacturing cost of the power module 3 is basically not affected.

In practical applications, the frame body 33 and the two fixing structures 35 may be made of metal. Preferably, the frame body 33 and each of the fixing structures 35 can also be made of materials with high thermal conductivity, and a part of the thermal energy generated when the power module 3 operates can also be transmitted to the heat dissipation element 1 through the frame body 33 and the two fixing structures 35 . , or, directly into the air.

As shown in FIG. 3 , each fixing structure 35 includes: a first through hole 351 , two second through holes 352 , a ring structure 353 and two sinking structures 354 . In order to clearly indicate the specific regions of the sunken structures 354 , the boundaries of the sunken structures 354 are marked with imaginary lines in FIG. 3 . In practice, the two fixing structures 35 can be identical structures. In this way, when the power module 3 is fixed to the flat surface 11 of the heat dissipation element 1 by the two screws 2, the heat dissipation surface 311 of the substrate 31 can be better flatly attached to the flat surface 11 of the heat dissipation element 1. Flat surface 11 of heat dissipation element 1 .

The first through hole 351 penetrates through the fixing structure 35 , and the first through hole 351 is used for a screw 2 to pass through. Each of the first through holes 351 may be circular holes, but not limited thereto. Each second through hole 352 penetrates through the fixing structure 35 , two second through holes 352 are centered on the first through hole 351 and located on both sides of the first through hole 351 , and the two second through holes 352 are disposed facing each other. Each second through hole 352 is arc-shaped, and each second through hole 352 is disposed around a part of the outer edge of the first through hole 351 . In practice, each of the second through holes 352 may be arc-shaped, and the centers of the arc-shaped second through-holes 352 overlap with the centers of the circular first through-holes 351 .

The annular structure 353 is located between the two second through holes 352 and the first through holes 351 . The outer diameter of each annular structure 353 may be approximately equal to the outer diameter of the head portion 22 of each screw 2 . The two sinking structures 354 are located on both sides of the annular structure 353 , each sinking structure 354 is connected to the annular structure 353 , and a sinkhole is formed between one end of each second through hole 352 and one end of another second through hole 352 . sink structure 354 .

FIG. 4 is a side view of the power device of the present invention, and FIG. 5 is a partial enlarged schematic view of FIG. 4 . As shown in FIG. 1, FIG. 3, FIG. 4, and FIG. 5, when the power module 3 is fixed to the heat dissipation element 1 by two screws 2, a stud 21 of each screw 2 will pass through the first through hole 351, and each screw 2 The head 22 will press against the corresponding annular structure 353, and make one side of the annular structure 353 flat against the flat surface 11 of the heat dissipation element 1, and the two sinking structures connected with each annular structure 353 354 , will be bent toward the flat surface 11 of the heat dissipation element 1 and generate a downward force, so that the heat dissipation surface 311 is more firmly flat on the flat surface 11 of the heat dissipation element 1 . The outer diameter of each annular structure 353 is substantially equal to the outer diameter of the head 22 of each screw 2 .

According to the above, the power module 3 of the present invention is designed through the first through hole 351 , the two second through holes 352 , the annular structure 353 and the two sinking structures 354 , and each screw 2 fixes the fixing structure 35 to the heat dissipation When the element 1 is used, since the two sunken structures 354 will bend in the direction of the flat surface 11 of the heat dissipation element 1, the annular structure 353 can be more firmly and flatly attached to the heat dissipation under the locking action of the head 22 of the screw 2. The flat surface 11 of the element 1, and the annular structure 353 and the heat dissipation element 1 will not easily create a gap, and the annular structure 353 and the head 22 of the screw 2 will not easily create a gap. Therefore, it can be greatly improved. The stability of the power module 3, the two screws 2 and the heat dissipation element 1 relative to each other.

In practice, the power device 100 may be installed in a vibrating environment (for example, the power device 100 is installed on a vehicle) depending on the product to be installed. Therefore, if the screw 2 cannot be locked, the related The structure is closely attached to the flat surface 11 of the heat dissipation element 1, and when the power device 100 is in a vibration environment, a gap between the screw 2 and the relevant fixing structure 35 will easily occur, so that the heat dissipation surface 311 of the power module 3 cannot be The problem of being tightly and flatly attached to the flat surface 11 of the heat dissipating element 1 may even lead to the problem of the screw 2 being loosened. As described above, if the heat dissipation surface 311 of the power module 3 is not tightly and flatly attached to the flat surface 11 of the heat dissipation element 1, a large amount of heat energy generated when the power module 3 operates will not be effectively transmitted through the heat dissipation element 1 to the outside. , for this reason, the operation efficiency of the power module 3 will be reduced, and the power module 3 may even be destroyed.

It should be emphasized that the two sinking structures 354 are arranged facing each other. Therefore, in the process of locking the studs 21 of each screw 2 with the screw holes 12 of the heat dissipation element 1, the annular structure 353 will It can sink relatively smoothly in the direction of the flat surface 11 of the heat dissipation element 1 , and finally, the annular structure 353 can be flatly attached to the flat surface 11 of the heat dissipation element 1 .

In the power device 100 of the present invention, through the design of the two sinking structures 354 , each section of the annular structure 353 can bear approximately the same downward force, so that the annular structure 353 can not only effectively When the power module 3 is pushed against the flat surface 11 of the heat dissipation element 1 by the screw 2 and the power module 3 is in a vibration environment, a gap is relatively difficult to generate between the annular structure 353 and the heat dissipation element 1 .

In addition, the main function of the two fixing structures 35 is to use the two screws 2 to fix the power module 3 to the flat surface 11 of the heat dissipation element 1 . Therefore, the two screws 2 are used to lock the power module 3 to the heat dissipation element 1 . When the flat surface 11 is formed, not only should the annular structures 353 be flat against the flat surface 11 of the heat dissipation element 1, but also the locking force provided by the two screws 2 to the heat dissipation element 1 can be effectively passed through the two The fixing structure 35 is transmitted to the power module 3, so that the heat dissipation surface 311 of the power module 3 can be flatly attached to the flat surface 11 of the heat dissipation element 1, so that the heat energy generated during the operation of the power module 3 can be effectively It is transmitted to the outside through the cooling element 1 .

As shown in FIG. 3 , in a preferred embodiment, the first through holes 351 of the power module 3 of the present invention are circular holes, the center of each first through hole 351 is located on the same axis L, and a part of each sinking structure 354 Located on the axis L, each of the first through holes 351 and the two adjacent second through holes 352 further divide the fixing structure 35 into two first outer connecting portions 35A, a second outer connecting portion 35B and an inner connecting portion Each of the first outer connecting portions 35A is located on the side of the second through hole 352 opposite to the first through hole 351, the second outer connecting portion 35B is located on the side of the first through hole 351 away from the package body 34, and the inner connecting portion 35C is located on the side of the first through hole 351 away from the package body 34. Between a through hole 351 and the package body 34 ; when the power module 3 is fixed to the heat dissipation element 1 (as shown in FIG. 1 ) through two screws 2 (as shown in FIG. 1 ), each fixing structure 35 is away from the package body 34 The sunken structure 354 will be connected to the package body 34 through the second outer connecting portion 35B and the two first outer connecting portions 35A, and the sunken structure 354 close to the package body 34 will be connected to the package body 34 through the inner connecting portion 35C. The packages 34 are connected to each other, in this way, each screw 2 (as shown in FIG. 1 ) can pass through the fixing structure 35 to effectively make the heat dissipation surface 311 (as shown in FIG. 1 ) of the substrate 31 (as shown in FIG. 1 ) in the package 34 shown), closely adhered to the flat surface 11 of the heat dissipation element 1 .

One side of each annular structure 353 is flatly attached to the flat surface 11 of the heat dissipation element 1 , and the heat dissipation surface 311 of the heat dissipation element 1 is also closely attached to the flat surface 11 of the heat dissipation element 1 , and each of the annular structures 353 is flat. The downward force on the area is roughly the same. Therefore, when the power module 3 is in a vibration environment, a gap is not easily formed between each ring structure 353 and the heat dissipation element 1, and when the power module 3 is in a normal vibration environment , each annular structure 353 and the heat dissipation surface 311 can still be flatly attached to the flat surface 11 of the heat dissipation element 1 .

Please refer to FIG. 6 , which is a top view of the second embodiment of the power module of the present invention. This embodiment is the same as the previous embodiment, which will not be repeated below. The biggest difference between this embodiment and the previous embodiment is that the two sinking structures 354 of each fixing structure 35A of the power module 3A of this embodiment are respectively Defined as an inner sunk structure 354A1 and an outer sunk structure 354A2 , the inner sunk structure 354A1 is disposed close to the package body 34 , and the outer sunk structure 354A2 is disposed away from the package body 34 . Each fixing structure 35A further includes an auxiliary through hole 355, the auxiliary through hole 355 penetrates through the fixing structure 35A, the auxiliary through hole 355 is located between the inner subsidence structure 354A1 and the package body 34, and the diameter of the auxiliary through hole 355 is smaller than that of the first through hole 351, and each The center of the auxiliary hole 355 is located on the axis L. In the drawings of this embodiment, each auxiliary through hole 355 is a circular hole as an example, but the shape of each auxiliary through hole 355 is not limited to this.

Through the design of the auxiliary through holes 355, the structural strength of each fixing structure 35A in the surrounding area of the inner subsidence structure 354A1 can be weakened, and when the power module 3 is in an environment with high vibration frequency, the stress on the fixing structure 35A will be easier to bear. It is concentrated around the auxiliary through hole 355. Therefore, if each fixed structure 35A is subjected to shock energy exceeding the original design, the fixed structure 35A will be preferentially fractured around the auxiliary through hole 355, and the power module 3 can still continue to operate. been used for a while.

Please refer to FIG. 7 , which is a top view of the third embodiment of the power module of the present invention. This embodiment is the same as the previous embodiment, which will not be repeated below. The biggest difference between this embodiment and the previous embodiment is that each fixing structure 35B of the power module 3B in this embodiment includes four second through holes 352, Two of the second through holes 352 are disposed on one side of the first through holes 351 , and the other two second through holes 352 are disposed on the other side of the first through holes 351 , and the two second through holes 352 on the same side are formed in a row between each other. There is a weakened structure 356 ; when the power module 3 is fixed to the heat dissipation element 1 by two screws 2 , each weakened structure 356 is squeezed by the screws 2 and broken.

Please refer to FIG. 8 , which is a top view of the fourth embodiment of the power module of the present invention. This embodiment is the same as the previous embodiment, which will not be repeated below. The biggest difference between this embodiment and the previous embodiment is that the two first through holes of each fixing structure 35C included in the power module 3C of this embodiment are 351 is located on an axis L, any part of each sunken structure 354 is not located on the axis L, and a part of the two sunken structures 354 of each fixed structure 35C is located on a longitudinal line P, and the longitudinal line P is not parallel to the axis L. In practical applications, the longitudinal line P may be perpendicular to the axis L.

Each fixing structure 35C further includes an auxiliary through hole 355 , the auxiliary through hole 355 is disposed adjacent to one of the sinking structures 354 , and the diameter of the auxiliary through hole 355 is smaller than that of the first through hole 351 . In one variation of this embodiment, each fixing structure 35C may also not include the auxiliary through hole 355 .

Please refer to FIG. 9 and FIG. 10 together. FIG. 9 is a schematic diagram of a fifth embodiment of the power module of the present invention, and FIG. 10 is a cross-sectional schematic diagram of FIG. 9 along the line X-X. The biggest difference between this embodiment and the previous embodiment is that the package body 34D of the power module 3D of this embodiment is an inner fixing portion 357 of each fixing structure 35 and a part of each fixing structure 35D covered by injection molding. , so as to be mutually fixed with the two fixing structures 35D. In addition, the package body 34D further includes a plurality of through holes 341 , and a part of each pin 32 passes through one of the through holes 341 . In practical applications, the package body 34D may be fabricated by, for example, a related mold, but not limited thereto.

Please refer to FIG. 11 , which is a schematic diagram of the sixth embodiment of the power module of the present invention. The parts of this embodiment are the same as those of the previous embodiments, and will not be repeated here. The difference between this embodiment and the previous embodiments is that each fixing structure 35Y only includes a single second through hole 352Y and a single sinking structure 354Y. Each of the second through holes 352Y is arc-shaped, and each of the second through holes 352Y is arranged around a part of the periphery of the first through hole 351Y with the first through hole 351Y as the center. Each fixing structure 35Y has a first through hole 351Y, and each second through hole 352Y is arranged approximately around the periphery of the first through hole 351Y. A ring structure 353Y is formed between each first through hole 351Y and the second through hole 352Y. The sink structure 354Y is connected, and the sink structure 354Y is located between the package body 34 and the first through hole 351Y, and the second through hole 352Y does not exist between the package body 34 and the first through hole 351Y.

When the power module 3E of this embodiment is fixed to the heat dissipation element 1 (as shown in FIG. 1 ) by two screws 2 (as shown in FIG. 1 ), a stud 21 (as shown in 1) through the first through hole 351Y, a head 22 (shown in FIG. 1) of each screw 2 (shown in FIG. 1) presses against the corresponding annular structure 353Y, and makes the annular structure The 353Y is flat on the flat surface 11 of the heat dissipation element 1 (as shown in Figure 1 ), so that a large amount of heat energy generated when the power module 3C operates can be effectively discharged through the heat dissipation element 1 (as shown in Figure 1 ). It should be noted that, the power modules described in the uploading embodiments may also be manufactured, implemented or sold separately, and the power modules in the embodiments are not limited to only two screws and a heat dissipation element. Manufactured, implemented and sold together.

To sum up, in the power device and power module of the present invention, through the design of the first through hole, the second through hole, the annular structure and the two sinking structures, the power module can be stably fixed to the heat dissipation element by two screws so that the heat dissipation surface of the power module is flat on the flat surface of the heat dissipation element, so that a large amount of heat energy generated during the operation of the power module can be effectively exported through the heat dissipation element. The device and power module have relatively long service life in the relevant vibration test or vibration environment.

The above descriptions are only the preferred feasible embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, any equivalent technical changes made by using the contents of the description and accompanying drawings of the present invention are included in the present invention. within the scope of protection.

Claims (15)

1. A power module, comprising:

one side of the substrate is provided with at least one electronic element, and the other side of the substrate is a heat dissipation surface;

the packaging body wraps one side, provided with the electronic element, of the substrate, and the heat dissipation surface is exposed out of the packaging body;

one end of each pin is fixed on the substrate, and the other end of each pin penetrates out of the packaging body;

two fixing structures arranged at two opposite ends of the packaging body; each of the securing structures comprises:

a first through hole passing through the fixing structure;

at least two second through holes, each of which penetrates through the fixing structure, the at least two second through holes are positioned on both sides of the first through hole by taking the first through hole as a center, and the at least two second through holes are arranged opposite to each other; each second through hole is arc-shaped;

an annular structure located between at least two of the second through holes and the first through hole;

the two sinking structures are positioned on two sides of the annular structure, each sinking structure is connected with the annular structure, and one sinking structure is formed between one end of each second through hole and one end of the other second through hole;

when the power module is fixed on a heat dissipation element through two screws, a stud of each screw penetrates through the first through hole, one head of each screw abuts against the corresponding annular structure, and the annular structure is made to be flatly attached to a flat surface of the heat dissipation element.

2. The power module of claim 1, wherein each of said first through holes is a circular hole, the center of each of said first through holes is located on the same axis, and each of said submerged structures is located on said axis.

3. The power module of claim 2 wherein two of said submerged structures of each of said fixed structures are defined as an inner submerged structure and an outer submerged structure, respectively, said inner submerged structure is close to said package, said outer submerged structure is far away from said package, each of said fixed structures further comprises an auxiliary perforation, said auxiliary perforation runs through said fixed structure, said auxiliary perforation is located said inner submerged structure and between said packages, said auxiliary perforated aperture is smaller than said first perforated aperture, and each of said auxiliary perforated centers is located on said axis.

4. The power module of claim 3, wherein each of the fixing structures comprises four second through holes, two of the second through holes are disposed on one side of the first through hole, and the other two second through holes are disposed on the other side of the first through hole, and a weakening structure is formed between the two second through holes on the same side; when the power module is fixed to the heat dissipation element by the two screws, each of the weakened structures can be broken by being pressed by the screws.

5. The power module of claim 1 further comprising a frame disposed around the package and integrally formed with the two securing structures.

6. The power module as claimed in claim 1, wherein each of the fixing structures includes an inner fixing portion, the package body is fixed to the two fixing structures by injection molding, and each of the inner fixing portions is covered by the package body.

7. The power module of claim 1 wherein two of said first apertures are located along an axis, each of said countersinks is not located along said axis, and two of said countersinks of each of said fixtures are located along a longitudinal line, said longitudinal lines being not parallel to said axis, each of said fixtures further comprising an auxiliary aperture, said auxiliary aperture being located adjacent one of said countersinks, said auxiliary aperture having a smaller diameter than said first aperture.

8. A power module, comprising:

the electronic device comprises a substrate, a first circuit board and a second circuit board, wherein one side of the substrate is provided with at least one electronic element, and the other side of the substrate is a heat dissipation surface;

the packaging body wraps one side of the substrate, which is provided with the electronic element, and the heat dissipation surface is exposed out of the packaging body;

one end of each pin is fixed on the substrate, and the other end of each pin penetrates out of the packaging body;

two fixing structures disposed at opposite ends of the package body; each of the fixing structures includes:

a first through hole penetrating through the fixing structure;

the second through hole penetrates through the fixing structure, is in an arc shape, and is arranged around the periphery of the part of the first through hole by taking the first through hole as a center;

an annular structure located between the second through hole and the first through hole;

the sinking structure is positioned on one side of the annular structure, is positioned between the packaging body and the first through hole and is connected with the annular structure;

when the power module is fixed on a heat dissipation element through two screws, a stud of each screw penetrates through the first through hole, one head of each screw abuts against the corresponding annular structure, and the annular structure is made to be flatly attached to a flat surface of the heat dissipation element.

9. A power device, comprising:

a heat dissipation element;

two screws;

a power module, comprising:

one side of the substrate is provided with at least one electronic element, and the other side of the substrate is a heat dissipation surface;

the packaging body wraps one side, provided with the electronic element, of the substrate, and the heat dissipation surface is exposed out of the packaging body;

one end of each pin is fixed on the substrate, and the other end of each pin penetrates out of the packaging body;

two fixing structures disposed at opposite ends of the package body; each of the securing structures comprises:

a first through hole penetrating through the fixing structure;

at least two second through holes, each of which penetrates through the fixing structure, the at least two second through holes are positioned on two sides of the first through hole by taking the first through hole as a center, and the at least two second through holes are arranged opposite to each other; each second through hole is arc-shaped;

an annular structure located between at least two of the second through holes and the first through hole;

the two sinking structures are positioned on two sides of the annular structure, each sinking structure is connected with the annular structure, and one sinking structure is formed between one end of each second through hole and one end of the other second through hole;

when the power module is fixed on the heat dissipation element through the two screws, one stud of each screw penetrates through the first through hole, one head of each screw abuts against the corresponding annular structure, and the annular structure is made to be flatly attached to a flat surface of the heat dissipation element.

10. The power device of claim 9, wherein each of said first through holes is a circular hole, the center of each of said first through holes is located on the same axis, and each of said submerged structures is located on said axis.

11. The power device of claim 10, wherein two of said sinking structures of each of said fixing structures are defined as an inner sinking structure and an outer sinking structure, respectively, said inner sinking structure is close to said package, said outer sinking structure is far from said package, each of said fixing structures further comprises an auxiliary hole, said auxiliary hole penetrates through said fixing structure, said auxiliary hole is located between said inner sinking structure and said package, said auxiliary hole has a hole diameter smaller than that of said first hole, and each of said auxiliary holes has a center located on said axis.

12. The power device as claimed in claim 11, wherein each of the fixing structures comprises four second through holes, two of the second through holes are disposed on one side of the first through hole, and the other two second through holes are disposed on the other side of the first through hole, and a weakening structure is formed between the two second through holes on the same side; when the power module is fixed to the heat dissipation element by the two screws, each of the weakening structures can be broken by being pressed by the screws.

13. The power device of claim 9, wherein the power module further comprises a frame located around the package, and the frame is integrally formed with the two fixing structures.

14. The power device of claim 9, wherein each of the fixing structures comprises an inner fixing portion, the package is fixed to the two fixing structures by injection molding, and each of the inner fixing portions is covered by the package.

15. The power device of claim 9 wherein two of said first apertures are located on an axis, each of said countersinks is not located on said axis, and two of said countersinks of each of said securing structures are located on a longitudinal line, said longitudinal line being non-parallel to said axis, each of said securing structures further comprising an auxiliary aperture, said auxiliary aperture being disposed adjacent one of said countersinks, said auxiliary aperture having a smaller diameter than said first aperture.

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