Printed circuit board assembly PCBA

Abstract

The embodiment of the invention discloses a PCBA (Printed Circuit Board Assembly), which is applied to the technical field of circuit boards and can solve the problem of how to improve the mechanical reliability of the PCBA under the conditions of not greatly changing structural material stacking and limiting space conditions. The PCBA comprises the components of a PCB which comprises a first surface and a second surface which are oppositely arranged; at least one electronic component, wherein each electronic component is arranged on the first surface of the PCB; wherein the second surface of the PCB is provided with a plurality of bosses, and the heights of the plurality of bosses are different; and / or the PCB comprises at least three positioning holes, the at least three positioning holes are in one-to-one correspondence with the at least three bolt holes in the bottom plate so as to fix the PCB on the bottom plate, and the distance between at least one group of positioning holes in the at least three positioning holes is smaller than the distance between at least one group of bolt holes corresponding to the at least one group of positioning holes.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of circuit boards, and in particular to a printed circuit board assembly (PCBA). Background Art

[0002] With the gradual advancement of miniaturization of consumer terminal products, PCBA has gradually become thinner, and its dynamic reliability problem has become increasingly prominent. In order to adapt to the application of terminal products in more scenarios, the requirements for the structural stiffness of PCBA have become more stringent. At present, most of them improve the structural stiffness of PCBA by changing the PCBA stacking structure scheme, and by changing the PCBA stacking materials or external support scheme, which is subject to greater constraints of space and cost. Therefore, how to improve the mechanical reliability of PCBA without significantly changing the structural material stacking and space conditions has become an urgent problem to be solved. Summary of the invention

[0003] An embodiment of the present invention provides a printed circuit board assembly (PCBA) to solve the problem in the prior art of how to improve the mechanical reliability of the PCBA without significantly changing the stacking of structural materials and limiting space conditions.

[0004] In a first aspect, a printed circuit board assembly (PCBA) is provided, the PCBA comprising:

[0005] A PCB board, comprising a first surface and a second surface disposed opposite to each other;

[0006] At least one electronic component, each of which is disposed on the first surface of the PCB board;

[0007] Wherein, a plurality of bosses are arranged on the second surface of the PCB board, and the heights of the plurality of bosses are different; and / or, the PCB board comprises at least three positioning holes, and the at least three positioning holes correspond one-to-one to at least three bolt holes on the base plate so as to fix the PCB board on the base plate, and the distance between at least one group of positioning holes among the at least three positioning holes is smaller than the distance between at least one group of bolt holes corresponding to the at least one group of positioning holes.

[0008] As an optional embodiment, in a first aspect of an embodiment of the present invention, the second surface of the PCB board includes a central area and an edge area surrounding the central area, the multiple bosses are respectively arranged in the central area and the edge area, the edge area includes a first edge area, a second edge area, a third edge area and a fourth edge area, and the height of each boss arranged in the first target area is higher than the height of any boss arranged in other areas, the first target area is any one of the first edge area, the second edge area, the third edge area and the fourth edge area, and the other areas include areas other than the first target area.

[0009] As an optional embodiment, in the first aspect of the embodiment of the present invention, the second surface of the PCB board includes a central area and an edge area surrounding the central area, the multiple bosses are respectively arranged in the central area and the edge area, the edge area includes a first edge area, a second edge area, a third edge area and a fourth edge area, and the height of each boss arranged in the second target area is higher than the height of any boss arranged in other areas, the second target area is any two adjacent edge areas of the first edge area, the second edge area, the third edge area and the fourth edge area, and the other areas include areas other than the second target area.

[0010] As an optional embodiment, in the first aspect of the embodiment of the present invention, the second surface of the PCB board includes a central area and an edge area surrounding the central area, the multiple bosses are respectively arranged in the central area and the edge area, and the height of each boss arranged in the central area is higher than the height of any boss arranged in the edge area.

[0011] As an optional embodiment, in the first aspect of the embodiment of the present invention, the second surface of the PCB board includes a central area, a middle area surrounding the central area and an edge area surrounding the middle area, the multiple bosses are respectively arranged in the central area, the middle area and the edge area, the middle area includes a first middle area, a second middle area, a third middle area and a fourth middle area, and the height of each boss arranged in the third target area is higher than the height of any boss arranged in other areas, the third target area is any two non-adjacent areas of the first middle area, the second middle area, the third middle area and the fourth middle area, and the other areas include areas other than the third target area.

[0012] As an optional embodiment, in the first aspect of the embodiment of the present invention, the second surface of the PCB board includes a central area, a middle area surrounding the central area and an edge area surrounding the middle area, the multiple bosses are respectively arranged in the central area, the middle area and the edge area, the middle area includes a first middle area, a second middle area, a third middle area and a fourth middle area, and the height of each boss arranged in the fourth target area is higher than the height of any boss arranged in other areas, the fourth target area is any one of the first middle area, the second middle area, the third middle area and the fourth middle area, and the other areas include areas other than the fourth target area.

[0013] As an optional embodiment, in the first aspect of the embodiment of the present invention, the second surface of the PCB board includes a central area, a middle area surrounding the central area, and an edge area surrounding the middle area, and the multiple bosses are respectively arranged in the central area, the middle area and the edge area, and the height of each boss arranged in the middle area is higher than the height of any boss arranged in other areas, and the other areas include areas other than the middle area.

[0014] As an optional implementation, in a first aspect of an embodiment of the present invention, the second surface of the PCB board includes a central area and an edge area surrounding the central area, the at least three positioning holes are arranged in the edge area and pass through the first surface and the second surface, the edge area includes a first edge area, a second edge area, a third edge area and a fourth edge area, the at least three positioning holes include a first part of positioning holes and a second part of positioning holes, the first part of positioning holes and the second part of positioning holes are located on both sides of a target center line of the second surface, and the target center line is a center line perpendicular to or parallel to one of the first edge area, the second edge area, the third edge area and the fourth edge area;

[0015] The at least one group of positioning holes includes target positioning holes, and the target positioning holes include positioning holes in the first part of positioning holes and / or positioning holes in the second part of positioning holes.

[0016] As an optional implementation, in the first aspect of the embodiments of the present invention, the target positioning holes are located in the same edge area or adjacent edge areas.

[0017] As an optional embodiment, in a first aspect of the embodiment of the present invention, the height difference between the multiple bosses is proportional to the stiffness parameter of the PCBA, and the absolute value of the difference between the distance between the at least one group of locating holes and the distance between the at least one group of bolt holes is inversely proportional to the stiffness parameter of the PCBA.

[0018] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0019] In an embodiment of the present invention, a PCBA comprises: a PCB board, comprising a first surface and a second surface disposed opposite to each other; at least one electronic component, each of which is disposed on the first surface of the PCB board; wherein a plurality of bosses are disposed on the second surface of the PCB board, and the plurality of bosses have different heights; and / or the PCB board comprises at least three positioning holes, the at least three positioning holes correspond to at least three bolt holes on the bottom plate one by one, so as to fix the PCB board on the bottom plate, and the distance between at least one group of positioning holes among the at least three positioning holes is smaller than the distance between at least one group of bolt holes corresponding to the at least one group of positioning holes. In this scheme, bosses of different heights are disposed on the PCB board, so that after the PCBA is fixed on the bottom plate, the PCBA at some positions will be raised, resulting in a certain extension of the PCBA; and when the distance between at least one group of positioning holes is smaller than the distance between the corresponding at least one group of bolt holes, when the PCBA is fixed through the group of positioning holes, the PCBA between the two positioning holes will also be extended to a certain extent, so that the PCBA can be subjected to a certain preload force, thereby effectively improving the structural rigidity of the PCBA without requiring a large space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the structure of a PCBA provided by an embodiment of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the structure of a PCBA provided by an embodiment of the present invention. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the structure of a PCBA provided by an embodiment of the present invention. Figure 3 ;

[0024] Figure 4This is a schematic diagram of the structure of a PCBA provided by an embodiment of the present invention. Figure 4 ;

[0025] Figure 5 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 1 ;

[0026] Figure 6 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 2 ;

[0027] Figure 7 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 3 ;

[0028] Figure 8 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 4 ;

[0029] Fig. 9 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 5 ;

[0030] Fig.10 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 6 ;

[0031] Fig.11 This is a schematic diagram of the structure of a PCBA provided by an embodiment of the present invention. Figure 5 ;

[0032] Fig.12 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 7 ;

[0033] Fig.13 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 8 ;

[0034] Fig.14 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 9 ;

[0035] Fig.15 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 10 ;

[0036] Fig.16 This is a schematic diagram of the structure of a PCBA provided by an embodiment of the present invention. Figure 6 ;

[0037] Fig.17 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 10 one;

[0038] Fig.18 This is a schematic diagram of the preload force of a PCBA provided in an embodiment of the present invention. Figure 10 two. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The terms "first" and "second" in the specification and claims of the present invention are used to distinguish different objects rather than to describe a specific order of the objects. For example, a first edge region and a second edge region are used to distinguish different edge regions rather than to describe a specific order of the edge regions.

[0041] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatus.

[0042] It should be noted that, in the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0043] Printed circuit board (PCB), also known as printed circuit board, printed circuit board, PCB is an important electronic component in the electronics industry. It is the support of electronic components and the carrier of electrical connection of electronic components. PCB has been widely used in the production and manufacturing of electronic products. The reason why it can be widely used is that its unique characteristics are summarized as follows: high wiring density, small size, light weight, which is conducive to the miniaturization of electronic equipment; because the graphics are repetitive and consistent, wiring and assembly errors are reduced, and equipment maintenance, debugging and inspection time are saved; it is conducive to mechanized and automated production, improves labor productivity and reduces the cost of electronic equipment; the design can be standardized, which is conducive to interchangeability.

[0044] PCBA is the abbreviation of Printed Circuit Board + Assembly, which means that PCBA is the whole process of SMT on PCB blank board and then DIP plug-in. Among them, SMT and DIP are both ways to integrate parts on PCB board. The main difference is that SMT does not need to drill holes on PCB, while DIP needs to insert the PIN pins of parts into the already drilled holes.

[0045] It should be noted that surface mount technology (SMT) mainly uses a mounter to mount some tiny parts onto a PCB board. Its production process is: PCB board positioning, solder paste printing, mounter mounting, reflow furnace and finished inspection; DIP is a "plug-in", which means inserting parts on the PCB board. When the part is large in size and not suitable for mounting technology, it is integrated in the form of a plug-in. Its main production process is: adhesive backing, plug-in, inspection, wave soldering, board brushing and finished inspection.

[0046] In summary, PCBA generally refers to a processing flow, which can also be understood as a finished circuit board. That is, PCBA can only be considered after all the processes on the PCB are completed. Therefore, PCBA may include PCB and electronic components. In actual application, PCBA needs to be fixed on the base plate. In order to ensure that there is a certain gap between the PCBA and the base plate, some bosses are provided on the bottom surface of the PCBA (i.e., the surface opposite to the electronic components) to raise the PCBA; and, since bolts are usually used for fixing, positioning holes are provided on some corners of the PCBA. The positioning holes and the bolt holes on the base plate are equidistantly corresponding, that is, the distance between the positioning holes at the two corners is equal to the distance between the bolt holes at the corresponding corners on the floor.

[0047] At present, with the gradual advancement of miniaturization of consumer terminal products, PCBA is gradually thinning, and its dynamic reliability problem is becoming increasingly prominent. During the use of terminal products, it may be subjected to various external forces, which may cause PCBA to be damaged. Therefore, the dynamic reliability of electronic components on PCBA is mainly affected by the dynamic characteristics of PCBA. When the stiffness of PCBA is high, the deformation of PCBA is small when subjected to dynamic loads, and the mechanical reliability of electronic devices is high; when the stiffness of PCBA is weak, the deformation of PCBA is large when subjected to dynamic loads, and the mechanical reliability of electronic devices is low. Therefore, improving the structural stiffness of PCBA is the key to improving the dynamic reliability of electronic components.

[0048] The theory of the present invention is derived from the plate, shell and beam dynamics theory of classical mechanics. The natural frequencies of plates, shells and beams are calculated from the perspective of modal analysis. The structural stiffness is changed by changing the natural frequencies, thereby changing the dynamic characteristics of plates, shells and beams.

[0049] When PCBA is not excited by external dynamic load, its dynamic equation can be written as: Where m is the effective mass, x is the displacement, and are the first and second derivatives of x, respectively, and EI is the structural stiffness. Therefore, the first-order natural frequency of PCBA can be written as: Among them, f is the natural frequency, m is the effective mass, and EI is the structural stiffness.

[0050] It can be seen from the above formula that the natural frequency f is proportional to the structural stiffness and inversely proportional to the effective mass.

[0051] Usually, PCBA designs stacking schemes based on electrical performance, and its effective mass is often difficult to change. The natural frequency can only be increased by changing the structural stiffness EI. On the other hand, the method of changing the natural frequency is generally to change the structure or use a material with greater stiffness, but the volume of most terminal products is gradually shrinking, which leads to limited space for PCBA and inability to make major structural or material changes, making it difficult to implement.

[0052] Therefore, in the embodiment of the present invention, a method of applying a preload force to the PCBA to improve the structural stiffness of the PCBA is proposed. When an additional preload force is applied to the PCBA and it is kept within the elastic range, the natural frequency calculation method can be rewritten as: Wherein, F is the preload force applied to PCBA10, and λ is the coefficient of the preload force, and its value is related to the application method and position of the preload force, etc.

[0053] It can be seen from the above formula that when the structural stiffness EI and effective mass m of PCBA remain unchanged, the natural frequency is proportional to the applied preload λF.

[0054] Furthermore, the above formula is transformed and the natural frequency of the PCBA after the preload is applied is rewritten as: Where m is the effective mass, EI is the structural stiffness, F is the preload applied to the PCBA, λ is the coefficient of the preload, and (EI)' is the new structural stiffness of the PCBA after the preload is applied.

[0055] It can be seen that after the preload is applied to the PCBA, the structural stiffness of the PCBA is proportional to λF, that is, the dynamic stiffness of the PCBA increases with the increase of λF.

[0056] For PCBA, improving the dynamic stiffness of PCBA will reduce the deformation of PCBA when the consumer terminal product is subjected to dynamic load, and the deformation of electronic components inside PCBA will also be reduced, thereby reducing the risk of failure and improving the mechanical reliability of the device.

[0057] There are various methods for applying preload force to PCBA, such as slightly raising the boss, slightly shifting the bolt hole and the positioning hole, etc., which are certainly not limited to the above methods and may include other methods, which are not specifically limited in the embodiments of the present invention.

[0058] In summary, it can be known that when the PCBA is loaded on the terminal product during actual use, the terminal product may be subjected to various external dynamic loads, and the PCBA will also be subjected to external dynamic loads, which may cause deformation or damage to the PCBA. Therefore, it is necessary to improve the structural stiffness of the PCBA before the PCBA leaves the factory. The method of improving the structural stiffness of the PCBA proposed in the embodiment of the present invention is to pre-apply a certain pre-tightening force to the PCBA, so that if the PCBA is subjected to a certain degree of external force during subsequent use, the pre-applied pre-tightening force may play a certain buffering role. The method of applying the pre-tightening force proposed in the embodiment of the present invention is: increasing the height of the boss and / or shortening the distance between the positioning holes.

[0059] In the embodiment of the present invention, Figure 1 As shown, the PCBA 10 includes: a PCB board 11 and at least one electronic component 12 .

[0060] The PCB board 11 includes a first surface 111 and a second surface 112 which are arranged opposite to each other, and each electronic component 12 is arranged on the first surface 111 of the PCB board 11; that is, the first surface 111 of the PCB board 11 is a surface on which at least one electronic component 12 is arranged, and the second surface 112 of the PCB board 11 is a surface attached to the bottom plate, and a plurality of bosses 20 are arranged on the second surface 112, and / or, at least three positioning holes 30 are included.

[0061] Among them, PCBA10 needs to be fixed on the base plate when working, and it can be fixed by bolts or tin welding.

[0062] Optional, such as Figure 1 As shown, a plurality of bosses 20 are provided on the second surface 112, and only one boss 20 is marked in the figure. All bosses 20 have similar shapes, and the plurality of bosses 20 have different heights, that is, at least one boss 20 among the plurality of bosses 20 has a height different from that of the other bosses 20. Of course, there may be only one boss 20 with a height different from that of the other bosses 20, or there may be a plurality of bosses 20 with different heights, or there may be all bosses 20 with different heights, and the embodiment of the present invention is not limited thereto.

[0063] in, Figure 1The purpose of the multiple bosses 20 shown in the figure is to ensure that when the PCBA 10 is fixed on the base plate, there can be a certain gap between the PCBA 10 and the base plate in the vertical direction. If there is no boss 20, the PCBA 10 may be tightly attached to the base plate. After the multiple bosses 20 are set, due to the height of the boss 20, a gap will be caused between the PCBA 10 and the base plate; and, since the heights of the multiple bosses 20 are different, there must be at least one boss 20 that is higher than the other bosses 20. Therefore, when the PCBA 10 is fixed on the base plate, the entire PCBA 10 may be in a non-horizontal state, and some areas may be raised due to the height of the boss 20.

[0064] For example, Figure 2 As shown, if the height of the boss 20 is increased, then after the PCBA 10 is fixed to the base plate 40, the PCBA 10 will bulge out at the position where the height of the boss 20 is increased, and the PCBA 10 will not bulge out at the position where the height of the boss 20 is not increased. Then, when the fixed position remains unchanged, the PCBA 10 is equivalent to being extended to a certain extent, which can increase the structural rigidity of the PCBA 10.

[0065] Optionally, at least three positioning holes 30 are provided on the second surface 112 of the PCB board 11, and the at least three positioning holes 30 need to correspond one-to-one with at least three bolt holes on the bottom plate, so that the PCB board 11 can be fixed on the bottom plate.

[0066] It should be noted that the at least three positioning holes 30 correspond to the at least three bolt holes one by one, which specifically means that each positioning hole 30 needs to correspond to one bolt hole, but one bolt hole can correspond to multiple positioning holes 30 at the same time. Since the bolt holes on the bottom plate need to be inserted with bolts to fix the PCBA10, in order to fix it firmly, the at least three bolt holes need to be located at at least three corners of the bottom plate, that is, the bottom plate is usually rectangular in shape, including four corners, so at least one bolt hole must be set at at least three of the corners.

[0067] Furthermore, on the PCBA 10, at least one positioning hole 30 may be provided in each corner region, and the at least one positioning hole 30 may correspond to a bolt hole in the corresponding corner region on the bottom plate. Figure 1 As shown, three positioning holes 30 are included in the lower left corner of PCBA10, and these three positioning holes 30 all correspond to the bolt holes in the lower left corner of the base plate. When PCBA10 is fixed to the base plate, no matter which one of the three positioning holes 30 the bolt passes through, it will pass through the bolt hole in the lower left corner of the base plate.

[0068] Optionally, the distance between at least one group of positioning holes 30 among the at least three positioning holes 30 is smaller than the distance between at least one group of bolt holes corresponding to the at least one group of positioning holes 30 .

[0069] It should be noted that, since PCBA10 includes at least three positioning holes 30, after combining the positioning holes 30 in pairs, multiple groups of positioning holes 30 can be obtained, and the bolt holes on the base plate are also combined in pairs accordingly to obtain multiple groups of bolt holes. Among the multiple groups of positioning holes 30, there is at least one group of positioning holes 30 whose distance is smaller than the distance between at least one group of bolt holes corresponding to at least one group of positioning holes 30. In other words, there may be a group of positioning holes 30 whose distance is smaller than the distance between the corresponding group of bolt holes, there may also be multiple groups of positioning holes 30 whose distance is smaller than the distance between the corresponding multiple groups of bolt holes, and there may also be a distance between each group of positioning holes 30 whose distance is smaller than the distance between each corresponding group of bolt holes.

[0070] For example, Figure 1 As shown, PCBA10 includes multiple positioning holes 30, among which positioning hole A, positioning hole B and positioning hole C are used for illustration; positioning hole A on PCBA10 corresponds to bolt hole A on the bottom plate, positioning hole B on PCBA10 corresponds to bolt hole B on the bottom plate, and positioning hole C on PCBA10 corresponds to bolt hole C on the bottom plate. Combining the above three positioning holes 30 can obtain three groups of positioning holes 30, and combining the above three bolt holes in the same way can obtain three groups of bolt holes, and the following situations may occur:

[0071] Case 1: The distance between locating hole A and locating hole B is smaller than the distance between bolt hole A and bolt hole B, the distance between locating hole A and locating hole C is equal to the distance between bolt hole A and bolt hole C, and the distance between locating hole B and locating hole C is equal to the distance between bolt hole B and bolt hole C.

[0072] Case 2: The distance between locating hole A and locating hole B is equal to the distance between bolt hole A and bolt hole B, the distance between locating hole A and locating hole C is smaller than the distance between bolt hole A and bolt hole C, and the distance between locating hole B and locating hole C is equal to the distance between bolt hole B and bolt hole C.

[0073] Case 3: The distance between locating hole A and locating hole B is equal to the distance between bolt hole A and bolt hole B, the distance between locating hole A and locating hole C is equal to the distance between bolt hole A and bolt hole C, and the distance between locating hole B and locating hole C is less than the distance between bolt hole B and bolt hole C.

[0074] Case 4: The distance between locating hole A and locating hole B is smaller than the distance between bolt hole A and bolt hole B, the distance between locating hole A and locating hole C is smaller than the distance between bolt hole A and bolt hole C, and the distance between locating hole B and locating hole C is equal to the distance between bolt hole B and bolt hole C.

[0075] Case 5: The distance between locating hole A and locating hole B is smaller than the distance between bolt hole A and bolt hole B, the distance between locating hole A and locating hole C is equal to the distance between bolt hole A and bolt hole C, and the distance between locating hole B and locating hole C is smaller than the distance between bolt hole B and bolt hole C.

[0076] Case 6: The distance between locating hole A and locating hole B is equal to the distance between bolt hole A and bolt hole B, the distance between locating hole A and locating hole C is smaller than the distance between bolt hole A and bolt hole C, and the distance between locating hole B and locating hole C is smaller than the distance between bolt hole B and bolt hole C.

[0077] Case 7: The distance between locating hole A and locating hole B is smaller than the distance between bolt hole A and bolt hole B, the distance between locating hole A and locating hole C is smaller than the distance between bolt hole A and bolt hole C, and the distance between locating hole B and locating hole C is smaller than the distance between bolt hole B and bolt hole C.

[0078] From this, it can be seen that the distance between at least one group of positioning holes 30 is smaller than the distance between at least one group of bolt holes corresponding to at least one group of positioning holes 303. In this way, when the PCBA 10 is fixed on the base plate, the PCBA 10 corresponding to the at least one group of positioning holes 30 will be stretched and have a certain ductility.

[0079] For example, Figure 3 As shown, if the distance between the positioning holes 30 is shortened, then in the process of fixing the PCBA 10 to the base plate 40, the difference between the spacing of the positioning holes 30 and the spacing of the bolt holes will be compensated by a certain force, so that the bolts can be fixed vertically and firmly, then the part of the PCBA 10 between the bolts will be extended, which can increase the structural rigidity of the PCBA 10.

[0080] Optionally, you can also add Figure 2 and Figure 3 The combination increases the height of the boss 20 and shortens the distance between the positioning holes 30 to extend the PCBA 10, thereby increasing the structural rigidity of the PCBA 10.

[0081] Optionally, a plurality of bosses 20 are disposed on the second surface 112 of the PCB board 11 , and the positions and heights of the plurality of bosses 20 may include various situations, which are described in turn below.

[0082] Case 1: If Figure 4 The figure shows a plan view of the second side 112 of the PCB board 11. The second side 112 of the PCB board 11 includes a central area 50 and an edge area 60 surrounding the central area 50. A plurality of bosses 20 are respectively arranged in the central area 50 and the edge area 60. The edge area 60 includes a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64. In addition, the height of each boss 20 arranged in the first target area is higher than the height of any boss 20 arranged in other areas. The first target area is any edge area 60 among the first edge area 61, the second edge area 62, the third edge area 63 and the fourth edge area 64. The other areas include areas other than the first target area.

[0083] It should be noted that if Figure 4 As shown, the second surface 112 of the PCB board 11 is divided into five areas, namely a central area 50, a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, and a plurality of bosses 20 can be arranged in each area. Figure 4 Only a part of the bosses 20 are shown, wherein the bosses 20 in any edge region 60 may be higher than the bosses 20 in other regions.

[0084] Exemplarily, assuming that the first target area is the first edge area 61, the height of the boss B is higher than that of the boss A, the boss C, the boss D, and the boss E. Figure 5 As shown, after the PCBA 10 is fixed to the bottom plate 40, an upward preload force is applied to the PCBA 10 at the first edge region 61; assuming that the first target region is the fourth edge region 64, the height of the boss E is higher than the boss A, the boss B, the boss C and the boss D, as shown in FIG. Figure 6 As shown, after the PCBA 10 is fixed to the base plate 40 , an upward preload force is applied to the PCBA 10 at the fourth edge region 64 .

[0085] Case 2: If Figure 4The figure shows a plan view of the second side 112 of the PCB board 11. The second side 112 of the PCB board 11 includes a central area 50 and an edge area 60 surrounding the central area 50. A plurality of bosses 20 are respectively arranged in the central area 50 and the edge area 60. The edge area 60 includes a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64. In addition, the height of each boss 20 arranged in the second target area is higher than the height of any boss 20 arranged in other areas. The second target edge area is any two adjacent edge areas 60 among the first edge area 61, the second edge area 62, the third edge area 63 and the fourth edge area 64. The other areas include areas other than the second target area.

[0086] It should be noted that if Figure 4 As shown, the second surface 112 of the PCB board 11 is divided into five areas, namely a central area 50, a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, and a plurality of bosses 20 can be arranged in each area. Figure 4 Only a part of the bosses 20 are shown in FIG. 6 , wherein the bosses 20 in any two adjacent edge regions 60 may be higher than the bosses 20 in other regions.

[0087] Exemplarily, assuming that the second target area is the first edge area 61 and the fourth edge area 64, the heights of the bosses B and E are higher than the bosses A, C and D, as shown in FIG. Figure 7 As shown, after the PCBA 10 is fixed to the base plate 40 , an upward pre-tightening force is applied to the PCBA 10 at the first edge region 61 and the fourth edge region 64 at the same time.

[0088] Case 3: If Figure 4 The figure shows a plan view of the second side 112 of the PCB board 11. The second side 112 of the PCB board 11 includes a central area 50 and an edge area 60 surrounding the central area 50. A plurality of bosses 20 are respectively arranged in the central area 50 and the edge area 60. Moreover, the height of each boss 20 arranged in the central area 50 is higher than the height of any boss 20 arranged in the edge area 60.

[0089] It should be noted that if Figure 4 As shown, the second surface 112 of the PCB board 11 is divided into five areas, namely a central area 50, a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, and a plurality of bosses 20 can be arranged in each area. Figure 4 Only some of the bosses 20 are shown in FIG. 5 , wherein the bosses 20 in the central area 50 may be higher than the bosses 20 in all the edge areas 60 .

[0090] For example, the boss 20 in the central region 50 is higher than the bosses 20 in all edge regions 60, and the height of the boss A is higher than the boss B, the boss C, the boss D and the boss E. Figure 8 As shown, after the PCBA 10 is fixed to the base plate 40 , an upward preload force is applied to the PCBA 10 at the central area 50 .

[0091] Case 4: If Figure 4 The figure shows a plan view of the second side 112 of the PCB board 11, wherein the second side 112 of the PCB board 11 includes a central area 50 and an edge area 60 surrounding the central area 50, and a plurality of bosses 20 are respectively arranged in the central area 50 and the edge area 60, wherein the edge area 60 includes a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, and a height of each boss 20 arranged in the fifth target area is higher than a height of any boss 20 arranged in other areas, and the fifth target area is any edge area 60 of the first edge area 61, the second edge area 62, the third edge area 63 and the fourth edge area 64 and the central area 50, and other areas include areas except the fifth target area.

[0092] It should be noted that if Figure 4 As shown, the second surface 112 of the PCB board 11 is divided into five areas, namely a central area 50, a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, and a plurality of bosses 20 can be arranged in each area. Figure 4 Only a part of the bosses 20 are shown in FIG. 5 , wherein the bosses 20 in any one edge region 60 and the bosses 20 in the central region 50 may be higher than the bosses 20 in other regions.

[0093] Exemplarily, assuming that the fifth target area is the fourth edge area 64 and the central area 50, the heights of the boss A and the boss E are higher than the boss B, the boss C, and the boss D. Fig. 9 As shown, after the PCBA 10 is fixed to the base plate 40 , an upward preload force is applied to the PCBA 10 at the fourth edge region 64 and the center region 50 at the same time.

[0094] Case 5: If Figure 4The figure shows a plan view of the second side 112 of the PCB board 11, wherein the second side 112 of the PCB board 11 includes a central area 50 and an edge area 60 surrounding the central area 50, and a plurality of bosses 20 are respectively arranged in the central area 50 and the edge area 60, wherein the edge area 60 includes a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, and a height of each boss 20 arranged in the sixth target area is higher than a height of any boss 20 arranged in other areas, and the sixth target area is any two adjacent edge areas 60 among the first edge area 61, the second edge area 62, the third edge area 63 and the fourth edge area 64 and the central area 50, and other areas include areas except the sixth target area.

[0095] It should be noted that if Figure 4 As shown, the second surface 112 of the PCB board 11 is divided into five areas, namely a central area 50, a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, and a plurality of bosses 20 can be arranged in each area. Figure 4 Only a part of the bosses 20 are shown in FIG. 5 , wherein the bosses 20 in any two adjacent edge regions 60 and the bosses 20 in the central region 50 may be higher than the bosses 20 in other regions.

[0096] Exemplarily, assuming that the sixth target area is the first edge area 61, the fourth edge area 64 and the central area 50, the heights of the boss A, the boss B and the boss E are higher than the boss C and the boss D, as shown in FIG. Fig.10 As shown, after the PCBA 10 is fixed to the base plate 40 , an upward pre-tightening force is applied to the PCBA 10 simultaneously at the first edge region 61 , the fourth edge region 64 and the central region 50 .

[0097] Case 6: If Fig.11 The figure shows a plan view of the second side 112 of the PCB board 11, wherein the second side 112 of the PCB board 11 includes a central area 50, a middle area 70 surrounding the central area 50, and an edge area 60 surrounding the middle area 70, a plurality of bosses 20 are respectively arranged in the central area 50, the middle area 70, and the edge area 60, the middle area 70 includes a first middle area 71, a second middle area 72, a third middle area 73, and a fourth middle area 74, and a height of each boss 20 arranged in the third target area is higher than a height of any boss 20 arranged in other areas, the third target area is any two non-adjacent areas among the first middle area 71, the second middle area 72, the third middle area 73, and the fourth middle area 74, and the other areas include areas other than the third target area.

[0098] It should be noted that if Fig.11As shown, the second surface 112 of the PCB board 11 is divided into 9 areas, namely, a central area 50, a first middle area 71, a second middle area 72, a third middle area 73, a fourth middle area 74, a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, and a plurality of bosses 20 can be arranged in each area. Fig.11 Only part of the bosses 20 are shown in the figure, wherein the bosses 20 in any two non-adjacent middle areas 70 may be higher than the bosses 20 in other areas.

[0099] Exemplarily, assuming that the third target area is the first middle area 71 and the third middle area 73, the heights of bosses F and H are higher than bosses A, B, C, D, E, G, and I, as shown in FIG. Fig.12 As shown, after the PCBA 10 is fixed to the bottom plate 40 , an upward pre-tightening force is applied to the PCBA 10 at the first middle area 71 and the third middle area 73 at the same time.

[0100] Case 7: If Fig.11 The figure shows a plan view of the second side 112 of the PCB board 11, wherein the second side 112 of the PCB board 11 includes a central area 50, a middle area 70 surrounding the central area 50, and an edge area 60 surrounding the middle area 70, and a plurality of bosses 20 are respectively arranged in the central area 50, the middle area 70, and the edge area 60, wherein the middle area 70 includes a first middle area 71, a second middle area 72, a third middle area 73, and a fourth middle area 74, and a height of each boss 20 arranged in the fourth target area is higher than a height of any boss 20 arranged in other areas, and the fourth target area is any one of the first middle area 71, the second middle area 72, the third middle area 73, and the fourth middle area 74, and the other areas include areas other than the fourth target area.

[0101] It should be noted that if Fig.11 As shown, the second surface 112 of the PCB board 11 is divided into 9 areas, namely, a central area 50, a first middle area 71, a second middle area 72, a third middle area 73, a fourth middle area 74, a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, and a plurality of bosses 20 can be arranged in each area. Fig.11 Only a part of the bosses 20 are shown in FIG. 7 , wherein the bosses 20 in any one of the middle regions 70 may be higher than the bosses 20 in other regions.

[0102] Exemplarily, assuming that the fourth target area is the first middle area 71, the height of the boss F is higher than that of the boss A, boss B, boss C, boss D, boss E, boss G, boss H and boss I, as shown in FIG. Fig.13 As shown, after the PCBA 10 is fixed to the base plate 40 , an upward pre-tightening force is applied to the PCBA 10 at the first middle area 71 .

[0103] Case 8: If Fig.11 The figure shows a plan view of the second side 112 of the PCB board 11. The second side 112 of the PCB board 11 includes a central area 50, a middle area 70 surrounding the central area 50, and an edge area 60 surrounding the middle area 70. A plurality of bosses 20 are respectively arranged in the central area 50, the middle area 70, and the edge area 60. Moreover, the height of each boss 20 arranged in the middle area 70 is higher than the height of any boss 20 arranged in other areas. The other areas include areas other than the middle area 70.

[0104] It should be noted that if Fig.11 As shown, the second surface 112 of the PCB board 11 is divided into 9 areas, namely, a central area 50, a first middle area 71, a second middle area 72, a third middle area 73, a fourth middle area 74, a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, and a plurality of bosses 20 can be arranged in each area. Fig.11 Only some of the bosses 20 are shown in FIG. 7 , wherein the bosses 20 in the middle region 70 may be higher than the bosses 20 in all the edge regions 60 and the central region 50 .

[0105] For example, the boss 20 in the middle region 70 is higher than the bosses 20 in all edge regions 60 and the central region 50, and the heights of bosses F, G, H, and I are higher than bosses A, B, C, D, and E. Fig.14 As shown, after the PCBA 10 is fixed to the base plate 40 , an upward pre-tightening force is simultaneously applied to the PCBA 10 at the first middle area 71 , the second middle area 72 , the third middle area 73 and the fourth middle area 74 .

[0106] Case 9: If Fig.11The figure shows a plan view of the second side 112 of the PCB board 11, the second side 112 of the PCB board 11 includes a central area 50, a middle area 70 surrounding the central area 50 and an edge area 60 surrounding the middle area 70, a plurality of bosses 20 are respectively arranged in the central area 50, the middle area 70 and the edge area 60, the middle area 70 includes a first middle area 71, a second middle area 72, a third middle area 73 and a fourth middle area 74, and a height of each boss 20 arranged in the seventh target area is higher than a height of any boss 20 arranged in other areas, the seventh target area is any one of the first middle area 71, the second middle area 72, the third middle area 73 and the fourth middle area 74 and the central area 50, and other areas include areas except the seventh target area.

[0107] It should be noted that if Fig.11 As shown, the second surface 112 of the PCB board 11 is divided into 9 areas, namely, a central area 50, a first middle area 71, a second middle area 72, a third middle area 73, a fourth middle area 74, a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, and a plurality of bosses 20 can be arranged in each area. Fig.11 Only a part of the bosses 20 are shown in the figure, wherein the bosses 20 in any one of the middle areas 70 and the bosses 20 in the central area 50 may be higher than the bosses 20 in other areas.

[0108] Exemplarily, assuming that the seventh target area is the first middle area 71 and the central area 50, the heights of the boss A and the boss F are higher than the boss B, the boss C, the boss D, the boss E, the boss G, the boss H and the boss I, as shown in FIG. Fig.15 As shown, after the PCBA 10 is fixed to the base plate 40 , an upward pre-tightening force is applied to the PCBA 10 simultaneously in the first middle area 71 and the central area 50 .

[0109] Optionally, nine methods for increasing the height of the boss 20 at different positions are listed above, but this does not mean that only these nine methods are included. The above-mentioned various situations can also be combined arbitrarily to obtain more situations. Of course, more areas can be set on the second side 112 of the PCB board 11 to set the boss 20, and the embodiment of the present invention does not make specific limitations.

[0110] Optional, such as Fig.16As shown, the second surface 112 of the PCB board 11 includes at least three positioning holes 30, the second surface 112 of the PCB board 11 includes a central area 50 and an edge area 60 surrounding the central area 50, at least three positioning holes 30 are arranged in the edge area 60 and penetrate the first surface 111 and the second surface 112, the edge area 60 includes a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64, at least three positioning holes 30 include a first part of positioning holes 30 and a second part of positioning holes 30, the first part of the positioning holes 30 and the second part of the positioning holes 30 are located on both sides of a target center line 80 of the second surface 112, the target center line 80 is a center line perpendicular to or parallel to one of the edge areas 60 of the first edge area 61, the second edge area 62, the third edge area 63 and the fourth edge area 64; at least one group of positioning holes 30 includes a target positioning hole 30, and the target positioning hole 30 includes a positioning hole 30 in the first part of the positioning holes 30 and / or a positioning hole 30 in the second part of the positioning holes 30.

[0111] It should be noted that if Fig.16 As shown, the second side 112 of the PCB board 11 is divided into five areas, namely a central area 50, a first edge area 61, a second edge area 62, a third edge area 63 and a fourth edge area 64. The second side 112 of the PCB board 11 may include at least three positioning holes 30, each positioning hole 30 is arranged in the edge area 60, but a positioning hole 30 can be arranged in each edge area 60.

[0112] It should be noted that if Fig.16 As shown, in order to ensure that the PCBA 10 can be firmly fixed on the base plate 40, positioning holes 30 need to be provided on both sides of the target center line 80, and the target center line 80 is a center line perpendicular or parallel to any edge area 60. Fig.16 The target center line 80 is a center line perpendicular to the second edge area 62 and the fourth edge area 64, and is also a center line parallel to the first edge area 61 and the third edge area 63. The first part of the positioning hole 30 is Fig.16 The positioning hole C in the second part is Fig.16 Positioning hole A and positioning hole B in.

[0113] It should be noted that the distance between at least one group of positioning holes 30 among the at least three positioning holes 30 is smaller than the distance between at least one group of bolt holes corresponding to the at least one group of positioning holes 30. The at least one group of positioning holes 30 may include target positioning holes 30, and the target positioning holes 30 include the positioning holes 30 in the first part of the positioning holes 30 and / or the positioning holes 30 in the second part of the positioning holes 30. That is to say, the target positioning holes 30 may only include the positioning holes 30 in the first part of the positioning holes 30, or only include the positioning holes 30 in the second part of the positioning holes 30, or may simultaneously include the positioning holes 30 in the first part of the positioning holes 30 and the positioning holes 30 in the second part of the positioning holes 30.

[0114] The target positioning hole 30 is a positioning hole 30 that can apply a pre-tightening force to the PCBA after being fixed by bolts.

[0115] Optionally, the target positioning holes 30 may be located in the same edge region 60 or adjacent edge regions 60, that is, Fig.16 As shown, the target positioning hole 30 can be positioning hole A and positioning hole C in adjacent edge areas 60, or positioning hole A and positioning hole D in adjacent edge areas 60, or positioning hole A and positioning hole B in the same edge area 60, or positioning hole A and positioning hole E in the same edge area 60, and the embodiment of the present invention does not make specific limitations.

[0116] For example, Fig.17 As shown, the target positioning hole 30 may include a positioning hole B in the first part of the positioning holes 30 and a positioning hole A and a positioning hole C in the second part of the positioning holes 30. The at least one group of positioning holes 30 may be a positioning hole A and a positioning hole B, that is, the distance between the positioning hole A and the positioning hole B is smaller than the distance between the bolt hole A and the bolt hole B corresponding to the positioning hole A and the positioning hole B on the base plate 40. Therefore, after the PCBA 10 is fixed to the base plate 40, an outward pre-tightening force will be applied to the PCBA 10 in the first edge area 61 corresponding to the positioning hole A and the positioning hole B.

[0117] For example, Fig.18 As shown, the target positioning hole 30 may include a positioning hole C in the first part of the positioning holes 30 and a positioning hole A and a positioning hole B in the second part of the positioning holes 30. The at least one group of positioning holes 30 may be a positioning hole B and a positioning hole C, that is, the distance between the positioning hole B and the positioning hole C is smaller than the distance between the bolt hole B and the bolt hole C corresponding to the positioning hole A and the positioning hole B on the base plate 40. Therefore, after the PCBA 10 is fixed to the base plate 40, an outward pre-tightening force will be applied to the PCBA 10 in the fourth edge area 64 corresponding to the positioning hole B and the positioning hole C.

[0118] Optionally, in an embodiment of the present invention, the height difference between multiple bosses 20 is proportional to the stiffness parameter of PCBA10, and the absolute value of the difference between the distance between at least one group of positioning holes 30 and the distance between at least one group of bolt holes is inversely proportional to the stiffness parameter of PCBA10.

[0119] It should be noted that the stiffness parameter of PCBA10 is the target structural stiffness to which PCBA10 needs to be adjusted. The stiffness parameter of PCBA10 is determined based on the actual needs of the current PCBA10, for example: based on the service life, application scenarios, user classification, etc. of PCBA10.

[0120] Among them, the heights of multiple bosses 20 are different. For a target boss 20 that is higher than other bosses 20, the greater the height difference between the target boss 20 and the other bosses 20, the higher the target boss 20. Then, after the PCBA 10 is fixed to the base plate 40, the PCBA 10 at the corresponding position of the target boss 20 will be raised higher. The greater the preload force of the PCBA 10, the greater the extended length of the PCBA 10, thereby resulting in greater structural stiffness of the PCBA 10.

[0121] Among them, the distance between at least one group of positioning holes 30 is smaller than the distance between at least one group of bolt holes corresponding to at least one group of positioning holes 30. If the distance between the group of positioning holes 30 is smaller, then after the PCBA 10 is fixed to the base plate 40, the greater the pre-tightening force of the PCBA 10, the greater the extended length of the PCBA 10 between the group of positioning holes 30, thereby resulting in greater structural stiffness of the PCBA 10.

[0122] Optionally, the effective mass and initial structural stiffness of PCBA10 are both known fixed values. After the target structural stiffness is determined, according to the above natural frequency equivalent equation It can be seen that the preload force λF can be obtained by substituting the effective mass, initial structural stiffness and target structural stiffness into the formula, and λ is determined according to the position where the preload force is applied. Therefore, the specific method of applying the preload force can be determined by combining the above-mentioned multiple boss setting methods and positioning hole setting methods.

[0123] Optionally, the PCBA10 may be pre-tested for preload, which may be performed on a physical PCBA10 or on a simulated PCBA10. For testing PCBA10, various sizes of preload are applied to PCBA10 at multiple locations in advance to record the structural stiffness of the PCBA after the preload is applied, thereby obtaining the correspondence between the structural stiffness and the preload. Since the preload includes the size of the preload, the position of the preload, and the method of preloading, a large number of experiments may be conducted, and different methods, sizes, and positions may be selected to conduct experiments in turn and record the corresponding relationships, so that in subsequent practical applications, after the target structural stiffness of PCBA10 is determined, the corresponding size of the preload, the position of the preload, and the method of preloading may be directly selected to operate PCBA10.

[0124] In the embodiment of the present invention, bosses 20 of different heights are provided on the PCB board 11, so that after the PCBA 10 is fixed on the base plate 40, some positions of the PCBA 10 will be raised, resulting in a certain extension of the PCBA 10; and, when the distance between at least one group of positioning holes 30 is smaller than the distance between the corresponding at least one group of bolt holes, when the PCBA 10 is fixed through the group of positioning holes 30, the PCBA 10 between the two positioning holes 30 will also be extended to a certain extent, so that the PCBA 10 can be subjected to a certain pre-tightening force, thereby effectively improving the structural rigidity of the PCBA 10 without requiring a larger space; and, the specific boss height and positioning hole distance are obtained in advance through a large number of experiments, so that it can be ensured that the PCBA 10 is subjected to an accurate pre-tightening force to accurately improve the structural rigidity.

[0125] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present invention. The above-mentioned multiple embodiments are not necessarily multiple independent embodiments. Dividing into multiple embodiments is only used to highlight the different technical features in different embodiments. Those skilled in the art should be aware that the above-mentioned multiple embodiments can also be combined in any way.

[0126] In various embodiments of the present invention, it should be understood that the size of the serial numbers of the above-mentioned processes does not mean the necessary order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0127] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0128] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0129] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a memory and includes several requests for a computer device (which can be a personal computer, a server or a network device, etc., specifically a processor in a computer device) to perform some or all of the steps of the above methods of various embodiments of the present invention.

[0130] Those skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

Claims

1. A printed circuit board assembly PCBA, characterized in that: The PCBA includes: The PCB board comprises a first surface and a second surface disposed opposite to each other; At least one electronic component, each of which is disposed on the first surface of the PCB board; Wherein, a plurality of bosses are arranged on the second surface of the PCB board, and the heights of the plurality of bosses are different; and / or, the PCB board comprises at least three positioning holes, and the at least three positioning holes correspond one-to-one to at least three bolt holes on the base plate so as to fix the PCB board on the base plate, and the distance between at least one group of positioning holes among the at least three positioning holes is smaller than the distance between at least one group of bolt holes corresponding to the at least one group of positioning holes.

2. The PCBA according to claim 1, characterized in that: The second side of the PCB board includes a central area and an edge area surrounding the central area, the multiple bosses are respectively arranged in the central area and the edge area, the edge area includes a first edge area, a second edge area, a third edge area and a fourth edge area, and the height of each boss arranged in the first target area is higher than the height of any boss arranged in other areas, the first target area is any one of the first edge area, the second edge area, the third edge area and the fourth edge area, and the other areas include areas other than the first target area.

3. The PCBA according to claim 1, characterized in that: The second side of the PCB board includes a central area and an edge area surrounding the central area, the multiple bosses are respectively arranged in the central area and the edge area, the edge area includes a first edge area, a second edge area, a third edge area and a fourth edge area, and the height of each boss arranged in the second target area is higher than the height of any boss arranged in other areas, the second target area is any two adjacent edge areas among the first edge area, the second edge area, the third edge area and the fourth edge area, and the other areas include areas other than the second target area.

4. The PCBA according to any one of claims 1 to 3, characterized in that: The second side of the PCB board includes a central area and an edge area surrounding the central area, the multiple bosses are respectively arranged in the central area and the edge area, and the height of each boss arranged in the central area is higher than the height of any boss arranged in the edge area.

5. The PCBA according to claim 1, characterized in that: The second surface of the PCB board includes a central area, a middle area surrounding the central area, and an edge area surrounding the middle area. The multiple bosses are respectively arranged in the central area, the middle area and the edge area. The middle area includes a first middle area, a second middle area, a third middle area and a fourth middle area. Moreover, the height of each boss arranged in the third target area is higher than the height of any boss arranged in other areas. The third target area is any two non-adjacent areas among the first middle area, the second middle area, the third middle area and the fourth middle area. The other areas include areas other than the third target area.

6. The PCBA according to claim 1, characterized in that: The second side of the PCB board includes a central area, a middle area surrounding the central area, and an edge area surrounding the middle area. The multiple bosses are respectively arranged in the central area, the middle area and the edge area. The middle area includes a first middle area, a second middle area, a third middle area and a fourth middle area. Moreover, the height of each boss arranged in the fourth target area is higher than the height of any boss arranged in other areas. The fourth target area is any one of the first middle area, the second middle area, the third middle area and the fourth middle area. The other areas include areas other than the fourth target area.

7. The PCBA according to claim 1, characterized in that: The second side of the PCB board includes a central area, a middle area surrounding the central area, and an edge area surrounding the middle area. The multiple bosses are respectively arranged in the central area, the middle area and the edge area, and the height of each boss arranged in the middle area is higher than the height of any boss arranged in other areas. The other areas include areas other than the middle area.

8. The PCBA according to any one of claims 1-3 or 5-7, characterized in that: The second surface of the PCB board includes a central area and an edge area surrounding the central area, the at least three positioning holes are arranged in the edge area and penetrate the first surface and the second surface, the edge area includes a first edge area, a second edge area, a third edge area and a fourth edge area, the at least three positioning holes include a first part of positioning holes and a second part of positioning holes, the first part of positioning holes and the second part of positioning holes are located on both sides of a target center line of the second surface, and the target center line is a center line perpendicular to or parallel to one of the first edge area, the second edge area, the third edge area and the fourth edge area; The at least one group of positioning holes includes target positioning holes, and the target positioning holes include positioning holes in the first part of positioning holes and / or positioning holes in the second part of positioning holes.

9. The PCBA according to claim 8, characterized in that: The target positioning holes are located in the same edge area or adjacent edge areas.

10. The PCBA according to any one of claims 1-3 or 5-7, characterized in that: The height difference between the plurality of bosses is proportional to the stiffness parameter of the PCBA, and the absolute value of the difference between the distance between the at least one group of positioning holes and the distance between the at least one group of bolt holes is inversely proportional to the stiffness parameter of the PCBA.

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