Transistor fastening device, converter thereof and electronic equipment

Abstract

The utility model provides a transistor fastening device, a converter and an electronic equipment, the transistor fastening device comprises a housing, the housing is sleeved on the upper side of the transistor, the pin of the transistor is wound from the outer side of the housing and is inserted in the PCB, the upper side of the housing is provided with a first fixing part, and the upper side of the housing is provided with a second fixing part; the lower side of the shell is provided with a second fixing part, the first fixing part is used for fixing the PCB, and the second fixing part is used for fixing the transistor. According to the technical scheme of the embodiment, the PCB and the transistor can be fixed to the two sides of the shell before welding, the transistor is prevented from falling off in the welding process, and the production and manufacturing efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic circuits, and particularly relates to a transistor fastening device, a converter and an electronic device thereof. Background Art

[0002] A converter includes a transistor and a circuit board. Since the transistor generates heat during operation, a radiator needs to be provided to quickly conduct the heat generated by the transistor, so as to avoid aging and damage of the transistor due to long-term high-temperature state, and to ensure stable circuit performance and safe operation.

[0003] During the manufacturing process of the converter, a radiator needs to be provided on one side of the transistor, and the other side is soldered to the circuit board. In the process, the transistor needs to be fastened to the radiator first, and then the transistor is soldered to the circuit board. If the transistor is soldered first and then locked to the heat sink, the pins of the transistor will be subjected to tensile stress, resulting in transistor failure. During the circuit board assembly process, since the transistor and the circuit board cannot be fixed in advance, the transistor is likely to fall off the circuit board during the installation of the circuit board, resulting in low production efficiency. Summary of the Utility Model

[0004] An embodiment of the utility model provides a transistor fastening device, a converter and an electronic device thereof, which can clamp the transistor and the circuit board during the soldering process, avoid the transistor from falling off, and improve the production efficiency.

[0005] In a first aspect, an embodiment of the utility model provides a transistor fastening device.

[0006] The transistor fastening device is applied to a converter, which includes a PCB board, a transistor and a radiator distributed from top to bottom. The radiator is fixed to the lower side of the transistor. The transistor fastening device includes: a housing, which is sleeved on the upper side of the transistor. The pins of the transistor are wound out from the outside of the housing and inserted into the PCB board. A first fixing portion is provided on the upper side of the housing, and a second fixing portion is provided on the lower side of the housing. The first fixing portion is used to fix the PCB board, and the second fixing portion is used to fix the transistor.

[0007] According to some embodiments of the utility model, the second fixing portion is a positioning shaft, and a first blind hole is provided on the upper surface of the transistor, and the positioning shaft is inserted into the first blind hole.

[0008] According to some embodiments of the utility model, it further includes: a spring piece, which is located between the housing and the transistor. The spring piece is provided with a first through hole, and the positioning shaft passes through the first through hole and is inserted into the first blind hole.

[0009] According to some embodiments of the present utility model, positioning grooves are provided on both sides of the spring piece, and a positioning block is provided on each of the two sides of the lower side of the housing. The positioning block is snap-fitted into one of the positioning grooves. According to some embodiments of the present utility model, the first fixing portion is a second through hole protruding from the upper surface of the housing, and the PCB board is provided with a third through hole. The second through hole is inserted into the third through hole.

[0010] According to some embodiments of the present utility model, two protrusions are provided on the outer side of the second through hole, and two avoidance grooves are provided in the third through hole. The protrusions can pass through the avoidance grooves, and the protrusions are used to clamp the PCB board to the housing.

[0011] According to some embodiments of the present utility model, the spring piece is provided with a fourth through hole, and the heat sink is provided with a fifth through hole. Further included is a connecting member that passes through the fourth through hole and is fixed to the fifth through hole.

[0012] According to some embodiments of the present utility model, further included is a gasket located between the transistor and the heat sink.

[0013] In a second aspect, an embodiment of the present utility model further provides a converter, including the transistor fastening device as described in the first aspect.

[0014] In a third aspect, an embodiment of the present utility model further provides an electronic device, including the transistor fastening device as described in the first aspect, or including the converter as described in the second aspect.

[0015] An embodiment of the present utility model includes: a housing sleeved on the upper side of the transistor. The pins of the transistor extend out from the outside of the housing and are inserted into the PCB board. A first fixing portion is provided on the upper side of the housing, and a second fixing portion is provided on the lower side of the housing. The first fixing portion is used to fix the PCB board, and the second fixing portion is used to fix the transistor and the heat sink. According to the technical solution of this embodiment, the PCB board and the transistor can be fixed on both sides of the housing before welding, avoiding the transistor from falling off during the welding process and improving the production and manufacturing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an exploded view of a transistor fastening device provided by an embodiment of the present utility model;

[0017] Figure 2 is a schematic structural diagram of a transistor fastening device provided by another embodiment of the present utility model;

[0018] Figure 3 is a top view of a housing provided by another embodiment of the present utility model;

[0019] Figure 4 It is the top view of the spring piece provided by another embodiment of the present utility model;

[0020] Figure 5 It is the top view of the radiator provided by another embodiment of the present utility model. Detailed implementation manners

[0021] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0022] It should be noted that although the functional modules are divided in the device schematic diagram and the logical sequence is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order from the module division in the device or the sequence in the flowchart. Terms such as "first", "target", etc. in the specification, claims or the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence.

[0023] The present utility model provides a transistor fastening device, its converter and electronic equipment. The transistor fastening device includes: a housing sleeved on the upper side of the transistor, the pins of the transistor winding out from the outside of the housing and inserted into the PCB board, a first fixing portion provided on the upper side of the housing, and a second fixing portion provided on the lower side of the housing. The first fixing portion is used to fix the PCB board, and the second fixing portion is used to fix the transistor and the radiator. According to the technical solution of this embodiment, the PCB board and the transistor can be fixed on both sides of the housing before welding, avoiding the detachment of the transistor during the welding process and improving the production and manufacturing efficiency.

[0024] The transistor fastening device provided in this embodiment is applied to a converter. Referring to Figure 1 、 Figure 2 and Figure 3 , the converter includes a PCB board 20, a transistor 50 and a radiator 70 distributed from top to bottom, and the radiator 70 is fixed to the lower side of the transistor 50. The transistor fastening device provided in this embodiment includes a housing 30 sleeved on the upper side of the transistor 50, the pins of the transistor 50 winding out from the outside of the housing 30 and inserted into the PCB board 20, a first fixing portion 31 provided on the upper side of the housing 30, and a second fixing portion 32 provided on the lower side of the housing 30. The first fixing portion 31 is used to fix the PCB board 20, and the second fixing portion 32 is used to fix the transistor 50.

[0025] It should be noted that the material of the housing 30 is selected as a hard insulating material such as plastic or resin.

[0026] It should be noted that the PCB board 20, the transistor 50, and the radiator 70 are distributed from top to bottom. The first fixing portion 31 provided on the upper side of the housing 30 is used to fix the PCB board 20, and the second fixing portion 32 provided on the lower side of the housing 30 is used to fix the transistor 50. The radiator 70 is located below the transistor 50. Therefore, after using the housing 30 to fix the PCB board 20 and the transistor 50, the distribution from top to bottom is the PCB board 20, the housing 30, the transistor 50, and the radiator 70.

[0027] It should be noted that the housing 30 does not change the existing connection method between the PCB board 20 and the transistor 50. The housing 30 only serves as an intermediate connector to connect and fix the PCB board 20 and the transistor 50, and does not interfere with or affect any operations and steps in the soldering process.

[0028] It should be noted that the housing 30 is of an open structure, and the lower side of the housing 30 is an open structure, which is convenient for sleeving the housing 30 on the upper side of the transistor 50. An open structure is provided at the rear end of the housing 30, so that the pins of the transistor 50 can be wound out from the outside of the housing 30 and inserted into the PCB board 20 without perforating the surface of the housing 30. The housing 30 does not need to completely wrap the transistor 50 other than the pin part inside the housing 30, and the upper surface of the housing 30 does not need to be in full contact with the lower side of the PCB board 20. As long as the housing 30 has enough space to set the first fixing portion 31 and the second fixing portion 32, and can fix the PCB board 20 by using the first fixing portion 31 and fix the transistor 50 by using the second fixing portion 32. The application range of the transistor fastening device provided by this embodiment can be extended to transistors 50 of different models and similar sizes.

[0029] It should be noted that the first fixing portion 31 is located on the upper side of the housing 30 and is used to fix the PCB board 20. Using the first fixing portion 31 to fix and connect the housing 30 and the PCB board 20 provides a structural basis for the housing 30 to fix the PCB board 20 and the transistor 50 as an intermediate member. For example, the first fixing portion 31 can be a through hole, and a matching through hole is provided on the surface of the PCB board 20 to achieve snap connection. Another example is that the first fixing portion 31 can also be a connecting member, and a matching connecting hole is provided on the surface of the PCB board 20 to achieve fixation. Another example is that the first fixing portion 31 can be a buckle, and a matching card slot is provided on the surface of the PCB board 20 to achieve buckle connection.

[0030] Exemplarily, the first fixing portion 31 can be a housing through hole protruding from the upper surface of the housing 30, and there is a groove around the outside of the housing through hole. Before fixing the housing 30 and the PCB board 20, a PCB through hole is provided on the PCB board 20, and there is a protrusion around the hole wall of the PCB through hole. When fixing the housing 30 and the PCB board 20, the PCB through hole is snapped onto the housing through hole, and the protrusion of the PCB through hole is aligned and matched with the groove of the housing through hole. At this time, the first fixing portion 31 fixes the PCB board 20.

[0031] Exemplarily, the first fixing part 31 can also be a bolt fixed on the upper side of the housing 30 with the screw rod facing upward. Before fixing the housing 30 and the PCB board 20, drill a screw hole in the PCB board 20. When fixing the housing 30 and the PCB board 20, align the screw hole of the PCB board 20 with the bolt of the first fixing part 31, and rotate the PCB board 20 until the bolt and the screw hole are in a tightened state. At this time, the first fixing part 31 fixes the PCB board 20.

[0032] It should be noted that the second fixing part 32 is located on the lower side of the housing 30 and is used to fix the transistor 50. The second fixing part 32 is used to fix and connect the housing 30 and the transistor 50, providing a structural basis for the housing 30 to fix the PCB board 20 and the transistor 50 as an intermediate part. The second fixing part 32 can be in the form of a suction cup. When fixing the housing 30 and the transistor 50, use the suction cup to tightly suck the upper surface of the transistor 50, thereby fixing the transistor 50. The second fixing part 32 can also be a snap structure. Before fixing the housing 30 and the transistor 50, provide a blind hole on the upper surface of the transistor 50. When fixing the housing 30 and the transistor 50, insert the snap into the blind hole, thereby fixing the transistor 50.

[0033] It should be noted that during the implementation process, first fix the transistor 50 through the second fixing part 32 of the housing 30, and then fix the PCB board 20 through the first fixing part 31. The housing 30 serves as an intermediate part to fix the transistor 50 and the PCB board 20 before welding, and finally realizes fastening the PCB board 20 and the transistor 50 through the housing 30, and the pins of the transistor 50 are inserted into the welding holes of the PCB board 20.

[0034] In addition, in one embodiment, refer to Figure 1 and Figure 2 , the second fixing part 32 is a positioning shaft, and a first blind hole 51 is provided on the upper surface of the transistor 50, and the positioning shaft is inserted into the first blind hole 51.

[0035] It should be noted that the positioning shaft is used to connect the transistor 50 and the housing 30, providing a structural basis for the subsequent transistor fastening device to fasten the PCB board 20 and the transistor 50.

[0036] It should be noted that the positioning shaft can be a buckle, and the buckle can be a plastic with a certain elasticity such as nylon. When the buckle fixes the transistor 50, it is not easy to scratch the hole wall of the first blind hole 51. A groove is provided in the middle to the end of the buckle, and the groove gives the buckle a certain redundant space during the installation process. The end of the buckle has a convex structure, and the shaft diameter of the convex part can be slightly larger than the aperture of the first blind hole 51. During the installation process, the convex structure can make the buckle tightly fit into the first blind hole 51 of the transistor 50 to prevent the transistor 50 from detaching from the housing 30. During implementation, align the first blind hole 51 with the buckle, and apply a force to the transistor 50 in the direction of the buckle. Since the buckle has elasticity, it can deform and be inserted into the first blind hole 51, and tightly fit into the first blind hole 51 under the action of resilience.

[0037] In addition, in an embodiment, referring to Figure 1 , Figure 2 and Figure 4 , it further includes a spring piece 40. The spring piece 40 is located between the housing 30 and the transistor 50. The spring piece 40 is provided with a first through hole 41, and the positioning shaft passes through the first through hole 41 and is inserted into the first blind hole 51.

[0038] It should be noted that the spring piece 40 is located between the housing 30 and the transistor 50. The positioning shaft passes through the first through hole 41 and is inserted into the first blind hole 51. The positioning shaft fixes the spring piece 40 and the transistor 50 at the same time. The positioning shaft can be a buckle made of a plastic insulating material with a certain elasticity such as nylon. The end of the buckle has a convex structure. When the buckle passes through the first through hole 41, the convex structure passes through the first through hole 41. After the buckle passes through the first through hole 41, the spring piece 40 is fastened to the lower side of the housing 30, and then the buckle is inserted into the first blind hole 51 to fasten the transistor 50 to the lower side of the housing 30 and the spring piece 40. At this time, from top to bottom, there are the PCB board 20, the housing 30, the spring piece 40 and the transistor 50, providing a structural basis for the subsequent joint 10 and the spring piece 40 to jointly act to fasten the transistor 50 and the radiator 70.

[0039] It should be noted that by using the elasticity of the spring piece 40, the spring piece 40 shares part of the force, avoiding damage to the transistor 50 due to excessive pressure during the fastening process. The spring piece 40 can, while reducing the probability of damage to the transistor 50, press the transistor 50 and the radiator 70 as tightly as possible, so that the radiator 70 can quickly conduct the heat generated by the transistor 50.

[0040] In addition, in an embodiment, referring to Figure 1 and Figure 4 , positioning grooves 42 are provided on both sides of the spring piece 40, and a positioning block 33 is provided on each side of the lower side of the housing 30. The positioning block 33 is snap-fitted into a positioning groove 42.

[0041] It should be noted that the positioning grooves 42 are located on both sides of the spring piece 40 and can be square openings. The shape of the positioning block 33 can be a square protrusion provided at a position corresponding to the positioning grooves 42 on the inner side of the housing 30.

[0042] It should be noted that positioning grooves 42 are provided on both sides of the spring piece 40, and a positioning block 33 is respectively provided on both sides of the lower side of the housing 30. During the assembly process, one positioning block 33 is snapped into one positioning groove 42 to achieve the alignment and matching between the positioning block 33 and the positioning groove 42, so that during the process of assembling the spring piece 40 and the housing 30, the relative position between the positioning shaft and the spring piece 40 can be quickly determined, improving the matching efficiency between the positioning shaft and the first through hole 41, thereby reducing the assembly time. Moreover, the positioning block 33 is snapped into the positioning groove 42, and the positioning shaft passes through the first through hole 41, so that the spring piece 40 will not be displaced, facilitating the subsequent connecting member 10 to pass through the fourth through hole 43 of the spring piece 40.

[0043] It should be noted that the positioning block 33 can be a snap structure, and the end of the snap has a protruding structure. The distance between the protruding structures is slightly greater than the distance between the edges of the positioning grooves 42 of the spring piece 40, so that after the positioning block 33 is snapped into the positioning groove 42, the spring piece 40 is connected to the housing 30 and is not easily detached.

[0044] In addition, in one embodiment, referring to Figure 1 and Figure 2 , the first fixing portion 31 is a second through hole protruding from the upper surface of the housing 30, and the PCB board 20 is provided with a third through hole 21, and the second through hole is inserted into the third through hole 21.

[0045] It should be noted that the first fixing portion 31 is a second through hole with a hole wall protruding from the upper surface of the housing 30, and the PCB board 20 is provided with a third through hole 21. The third through hole 21 is directly opened on the PCB board 20 without protruding from the surface. The second through hole is inserted into the third through hole 21, so that the lower side of the PCB board 20 abuts against the upper surface of the housing 30 and restricts any movement of the PCB board 20 in the direction parallel to the ground, facilitating subsequent soldering.

[0046] In addition, in one embodiment, referring to Figure 1 、 Figure 2 and Figure 3 , two convex blocks 34 are provided on the outer side of the second through hole, and two avoiding grooves 22 are provided in the third through hole 21. The convex blocks 34 can pass through the avoiding grooves 22, and the convex blocks 34 are used to clamp the PCB board 20 to the housing 30.

[0047] It should be noted that when the second through-hole is inserted into the third through-hole 21, two bumps 34 are provided on the outer side of the second through-hole. The distance between the two bumps 34 is greater than the aperture of the third through-hole 21. The third through-hole 21 is provided with two avoidance grooves 22, so that the third through-hole 21 extends outward at the position where the avoidance grooves 22 are provided. The bumps 34 can pass through the avoidance grooves 22. During installation, the bumps 34 and the avoidance grooves 22 are aligned and matched. After the bumps 34 pass through the avoidance grooves 22, the PCB board 20 is rotated so that the bumps 34 and the avoidance grooves 22 are staggered, so that after installation, the bumps 34 abut against the PCB board 20, and the housing 30 is clamped at the PCB board 20. At this time, the housing 30 and the PCB board 20 are in a clamped state.

[0048] In addition, in one embodiment, referring to Figure 1 、 Figure 4 and Figure 5 , the spring piece 40 is provided with a fourth through-hole 43, the radiator 70 is provided with a fifth through-hole 71, and a connecting member 10 is further included. The connecting member 10 passes through the fourth through-hole 43 and is fixed to the fifth through-hole 71.

[0049] It should be noted that the connecting member 10 can be a screw, the fourth through-hole 43 can be a threaded hole, and the fifth through-hole 71 can be a threaded hole. The screw passes through the fourth through-hole 43 and is fixed to the fifth through-hole 71, thereby fixing the spring piece 40 and the radiator 70. Also, since the housing 30, the spring piece 40, and the transistor 50 have been connected and fixed by the positioning shaft of the housing 30, the radiator 70 can be fixed under the transistor 50 under the combined action of the screw and the spring piece 40, so that the transistor 50 is independently fixed to the radiator 70, avoiding damage to the transistor 50 pins due to force.

[0050] It should be noted that referring to Figure 1 and Figure 2, the outer edge of the lower side of the housing 30 is in a stepped style with a certain height difference. The height of the rear end of the housing 30 is greater than that of the front end of the housing 30. The top end of the spring piece 40 abuts against the upper surface of the radiator 70. During the process of the screw passing through the fourth through hole 43 and being fixed in the fifth through hole 71, pressure is applied to the spring piece 40 and the radiator 70. Also, since the spring piece 40 and the transistor 50 have been fastened to the lower side of the housing 30 through the second fixing portion 32, the transistor 50 will also receive a part of the pressure. During the tightening process of the screw, due to its elastic ability, when the spring piece 40 receives the downward force from the screw, it will undergo elastic deformation, thereby providing an upward force to the screw to prevent the transistor 50 from being overstressed. The height of the front end of the housing 30 is less than that of the rear end of the housing 30 in order to enable the top end of the spring piece 40 to abut against the upper surface of the radiator 70 and achieve elastic deformation to provide an upward elastic force. If the heights of the front and rear ends of the housing 30 are the same, it will cause the outer edge of the lower side of the housing 30 to be stressed during the tightening process, that is, the spring piece 40 cannot undergo elastic deformation and thus cannot generate an elastic force, and the transistor 50 may be damaged due to excessive pressure generated during the tightening of the screw.

[0051] In addition, in one embodiment, referring to Figure 1 and Figure 2 , it further includes a gasket 60, and the gasket 60 is located between the transistor 50 and the radiator 70.

[0052] It should be noted that the gasket 60 does not block any through holes. The gasket 60 is used to buffer the pressure between the transistor 50 and the radiator 70 to prevent the transistor 50 from being damaged by excessive stress during the fixed connection process with the housing 30 and the radiator 70.

[0053] The present utility model provides a fastening device. First, the housing 30 fastens the spring piece 40 and the transistor 50 to the lower side of the housing 30 through a buckle. Then, the second through hole of the housing 30 is inserted into the third through hole 21 of the PCB board 20 to fasten the PCB board 20 to the upper side of the housing 30. Then, a gasket 60 is placed between the transistor 50 and the radiator 70. Finally, a screw passes through the fourth through hole 43 and is inserted into the fifth through hole 71 and tightened to fasten the spring piece 40 and the radiator 70. Finally, the PCB board 20, the transistor 50, and the radiator 70 are fastened through the housing 30, the spring piece 40, and the screw. The pins of the transistor 50 are inserted into the welding holes of the PCB board 20. The overall structure is distributed from top to bottom as the PCB board 20, the housing 30, the spring piece 40, the transistor 50, the gasket 60, and the radiator 70. According to the technical solution of this embodiment, the PCB board 20 and the transistor 50 can be fixed on both sides of the housing 30 before welding, avoiding the detachment of the transistor 50 during the welding process and improving the production and manufacturing efficiency.

[0054] In addition, in one embodiment, a converter is further provided, including as Figure 1 and Figure 2The described transistor fastening device.

[0055] It should be noted that the converter adopts the above-mentioned transistor fastening device, which can fix the PCB board 20 and the transistor 50 on both sides of the housing 30 before welding, avoid the transistor 50 falling off during the welding process, and improve the production and manufacturing efficiency.

[0056] In addition, in an embodiment, an electronic device is further provided, including as Figure 1 and Figure 2 the described transistor fastening device, or including the converter as above.

[0057] It should be noted that the electronic device can be the converter itself or other devices applying the transistor fastening device. The specific type of the electronic device is not limited in this embodiment, as long as it can apply the above-mentioned transistor fastening device. The electronic device adopting the above-mentioned transistor fastening device can fix the PCB board 20 and the transistor 50 on both sides of the housing 30 before welding, avoid the transistor 50 falling off during the welding process, and improve the production and manufacturing efficiency.

[0058] Those skilled in the art will readily think of other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application.

[0059] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

[0060] The above is a specific description of the preferred embodiment of the present invention, but the present invention is not limited to the above-mentioned implementation manners. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A transistor fastening device is applied to a converter, characterized in that The converter includes a PCB board, a transistor, and a radiator that are distributed from top to bottom. The radiator is fixed to the lower side of the transistor. The transistor fastening device includes: A housing that is sleeved on the upper side of the transistor. The pins of the transistor extend out from the outside of the housing and are inserted into the PCB board. A first fixing portion is provided on the upper side of the housing, and a second fixing portion is provided on the lower side of the housing. The first fixing portion is used to fix the PCB board, and the second fixing portion is used to fix the transistor.

2. The transistor fastening device according to claim 1, characterized in that, The second fixing portion is a positioning shaft, and a first blind hole is provided on the upper surface of the transistor. The positioning shaft is inserted into the first blind hole.

3. The transistor fastening device according to claim 2, characterized in that, It further includes: A spring piece that is located between the housing and the transistor. The spring piece is provided with a first through hole, and the positioning shaft passes through the first through hole and is inserted into the first blind hole.

4. The transistor fastening device according to claim 3, characterized in that, Positioning grooves are provided on both sides of the spring piece, and a positioning block is provided on each side of the lower side of the housing. The positioning block is snapped into one of the positioning grooves.

5. The transistor fastening device according to claim 3, characterized in that, The first fixing portion is a second through hole that protrudes from the upper surface of the housing. The PCB board is provided with a third through hole, and the second through hole is inserted into the third through hole.

6. The transistor fastening device according to claim 5, wherein, Two protrusions are provided on the outside of the second through hole, and two avoidance grooves are provided in the third through hole. The protrusions can pass through the avoidance grooves, and the protrusions are used to clamp the PCB board to the housing.

7. The transistor fastening device according to claim 3 or 5, characterized in that, The spring piece is provided with a fourth through hole, and the radiator is provided with a fifth through hole. It further includes: A connecting member that passes through the fourth through hole and is fixed to the fifth through hole.

8. The transistor fastening device according to claim 1, characterized in that, It further includes: A gasket that is located between the transistor and the radiator.

9. A converter, characterized in that: It includes the transistor fastening device according to any one of claims 1 to 8.

10. An electronic device, characterized in that: It includes the transistor fastening device according to any one of claims 1 to 8, or includes the converter according to claim 9.

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