Reliable contact structure of PCB (printed circuit board) and radiator

Abstract

The utility model provides a reliable contact structure of a PCB (printed circuit board) and a radiator, which comprises the PCB and the radiator. The radiator is electrically connected with the windowing area; the reliable contact structure of the PCB and the radiator further comprises an elastic conductive part which is arranged between the windowing area and the radiator, and one end of the elastic conductive part is electrically connected with the radiator. After the radiator is installed on the PCB, the other end of the elastic conductive part is in interference fit with the windowing area of the PCB. According to the technical scheme provided by the utility model, the elastic conductive part which can be in interference fit with the PCB is arranged between the radiator and the PCB, so that the reliable contact between the radiator and the PCB is effectively ensured.

Description

Technical Field

[0001] The utility model relates to the field of heat dissipation and protection of PCB boards, and particularly to a structure for reliable contact between a PCB board and a radiator. Background Art

[0002] The PCB board of a headlight electronic control unit (ECU) usually needs to dissipate heat through an aluminum alloy sheet metal radiator, and the radiator needs to be grounded through the ESD area of the PCB to achieve ESD protection. However, in the field of headlight electronic control unit products, it is difficult to achieve reliable contact between the ESD area of the PCB and a die-cast radiator or a stamped radiator.

[0003] Generally, reliable contact of ESD is achieved by making a screw post structure on a stamped radiator between the aluminum alloy sheet metal radiator and the PCB circuit board. However, in this solution, the process of the screw post structure is difficult, it is difficult to accurately manufacture, and it is difficult to meet requirements such as strength and sealing, thus affecting the performance and reliability of the product. Or, reliable contact of ESD is achieved by making a boss structure for riveting and ordinary reed pieces on a stamped radiator. However, this solution requires adding a process of riveting reed pieces on the assembly line, increasing costs. At the same time, to meet the riveting requirements, the PCB board needs to reserve space to avoid the riveting head and the stress area, reducing the utilization rate of the PCB board. In other solutions, a metal sheet with a certain thickness is welded at the part where screws are installed on a thin metal plate shielding cover. Although this solution can solve the problem, it requires increasing welding costs and is not economical enough.

[0004] Therefore, developing a structure that can effectively improve the reliability between a stamped radiator or a die-cast radiator and a PCB board while taking cost into account has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Utility Model

[0005] In order to overcome the above technical defects, the purpose of the utility model is to provide a structure for reliable contact between a PCB board and a radiator.

[0006] According to an embodiment of the utility model, a structure for reliable contact between a PCB board and a radiator is disclosed, including a PCB board and a radiator. The PCB board includes: a windowed area; the radiator is electrically connected to the windowed area; the structure for reliable contact between the PCB board and the radiator further includes:

[0007] An elastic conductive component is arranged between the windowed area and the radiator, and one end of the elastic conductive component is electrically connected to the radiator; after the radiator is installed on the PCB board, the other end of the elastic conductive component is in interference fit with the windowed area of the PCB board.

[0008] Optionally, the elastic conductive component includes a conductive elastic piece, one end of the conductive elastic piece is fixedly connected to the radiator, and

[0009] the other end of the conductive elastic piece is in interference fit with the windowed area of the PCB board.

[0010] Optionally, the elastic conductive component includes more than one of the conductive elastic pieces.

[0011] Optionally, the elastic conductive component includes two of the conductive elastic pieces.

[0012] Optionally, the conductive elastic component further includes an elastic contact part provided at the other end of the conductive elastic piece, and the conductive elastic component is in interference fit with the windowed area of the PCB board through the elastic contact part.

[0013] Optionally, the elastic conductive component is in a butterfly-shaped elastic piece structure, the butterfly-shaped elastic piece structure includes two conductive elastic pieces, and elastic contact parts respectively provided at the other ends of the two conductive elastic pieces, and one ends of the two conductive elastic pieces are connected to each other and then fixed to the radiator.

[0014] Optionally, one end of the elastic conductive component is connected to the radiator by screws or riveting.

[0015] Optionally, the radiator includes a first riveting part, one end of the elastic conductive component is provided with a second riveting part adapted to the first riveting part, and after the first riveting part is connected to the second riveting part, the elastic conductive component is riveted to the radiator.

[0016] Optionally, the first riveting part is a riveting boss, the second riveting part is a conductive plate-like structure, and the conductive plate-like structure is provided with a riveting round hole adapted to the riveting boss.

[0017] Optionally, the radiator includes a die-cast radiator or a stamped radiator.

[0018] After adopting the above technical solution, compared with the prior art, the following beneficial effects are obtained:

[0019] 1. By providing the elastic conductive component capable of being in interference fit with the PCB board between the radiator and the PCB board, the reliable contact between the radiator and the PCB board is effectively ensured.

[0020] 2. The structure for reliable contact between the PCB board and the radiator provided by the present utility model has a simple structure and low cost. Description of the Drawings

[0021] Figure 1Explosion diagram of the reliable contact structure between the PCB board and the radiator according to the present utility model;

[0022] Figure 2 Cross-sectional view of the reliable contact structure between the PCB board and the radiator according to the present utility model;

[0023] Figure 3 Schematic diagram of the installation structure of the radiator and the elastic conductive component according to the present utility model;

[0024] Figure 4 Schematic diagram of the elastic conductive component in the present utility model;

[0025] Figure 5 Cross-sectional view after the assembly of the first riveting part of the radiator and the second riveting part of the elastic conductive component in the present utility model;

[0026] Reference numerals:

[0027] 1 - Radiator;

[0028] 2 - PCB board;

[0029] 3 - Elastic conductive component;

[0030] 4 - Window area;

[0031] 5 - Elastic contact part;

[0032] 6 - Conductive elastic sheet;

[0033] 7 - First riveting part;

[0034] 8 - Second riveting part;

[0035] 81 - Conductive plate-like structure;

[0036] 811 - Riveting round hole. Detailed implementation manners

[0037] The advantages of the present utility model are further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0038] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are only examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0039] The terms used in this disclosure are for the purpose of describing particular embodiments only and are not intended to limit the disclosure. The singular forms "a", "the", and "said" used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model.

[0041] In the description of the present utility model, unless otherwise specified and defined, it should be noted that the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] In the following description, the suffixes such as "module", "component", or "unit" used to represent elements are only for the convenience of describing the present utility model, and they do not have specific meanings in themselves. Therefore, "module" and "component" can be used interchangeably.

[0043] On the one hand, the present utility model provides a reliable contact structure between a PCB board and a radiator. Refer to Figure 1 and Figure 2 , which respectively show an exploded view and a cross-sectional view of a reliable contact structure between a PCB board and a radiator that conforms to the present utility model. The reliable contact structure between the PCB board and the radiator includes: a PCB board 2 and a radiator 1.

[0044] The PCB board 2 is used to carry electronic components. The PCB board 2 includes: a windowed area 4, and the windowed area 4 is electrically connected to the ground wire of the PCB board 2.

[0045] The radiator 1 is electrically connected to the windowed area 4 on the PCB board 2. Thus, the radiator 1 is electrically connected to the ground wire of the PCB board 2 by electrically contacting the windowed area 4, realizing ESD protection.

[0046] The reliable contact structure between the PCB board 2 and the radiator 1 further includes: an elastic conductive component 3. The elastic conductive component 3 is disposed between the windowed area 4 on the PCB board 2 and the radiator 1, and one end of the elastic conductive component 3 is electrically connected to the radiator 1; after the radiator 1 is installed on the PCB board, there is elastic pre-pressure contact between the radiator 1 and the PCB board 2, so that an interference fit is achieved between the other end of the elastic conductive component 3 and the windowed area 4 of the PCB board 2. Elastic pre-pressure contact is a contact state in which relative force is generated by applying elastic displacement on an elastic object to pre-press two objects (usually mechanical components) in advance. For example, in mechanical couplings or mating components, this method can be used to ensure sufficient contact between two surfaces, reduce vibration and looseness, and improve the stability and reliability of the connection. In this embodiment, an elastic conductive component is used to apply elastic displacement and force to pre-press the radiator and the PCB board in advance, so as to achieve elastic pre-pressure contact between the radiator and the PCB board. Thus, without damaging the windowed area in the PCB board, by applying a certain pressure on the contact surfaces of the two, the reliability and stability of the connection between the radiator and the PCB board can be ensured. Therefore, the technical solution provided by the present utility model realizes electrical contact between the radiator 1 and the PCB board 2 by providing an elastic conductive component between the radiator 1 and the PCB board 2 and through the way of elastic pre-pressure contact; it ensures the reliability of the contact and is also low in cost.

[0047] Based on Figure 1 and Figure 2 , referring to Figure 3 , optionally, the elastic conductive component 3 includes a conductive elastic sheet 6, one end of the conductive elastic sheet 6 is fixedly connected to the radiator 1, and the other end of the conductive elastic sheet 6 is in interference fit with the windowed area 4 of the PCB board 2.

[0048] Optionally, the elastic conductive component 3 includes more than one said conductive elastic sheet 6.

[0049] Preferably, the elastic conductive component 3 includes two said conductive elastic sheets 6. Compared with a single conductive elastic sheet 6, when there are more than two conductive elastic sheets 6 in the elastic conductive component 3, it can avoid the reduction of pre-pressure and position deviation between the single elastic sheet and the windowed area 4 of the PCB board 2 due to the influence of the moment force for a long time caused by the single-pole reason, thus avoiding the influence on the electrical performance. Pre-pressing two conductive elastic sheets 6 is sufficient to ensure the force balance of the conductive elastic sheets 6 of the elastic conductive component 3 and ensure the accuracy of the contact position, so it can also ensure reliable contact with the windowed area 4 of the PCB board 2.

[0050] Based on Figure 1 and Figure 2 , referring to Figure 4, Preferably, the conductive elastic component further includes an elastic contact portion 5 disposed at the other end of the conductive elastic sheet 6, and the conductive elastic component 3 is in interference fit with the windowed area 4 of the PCB board 2 through the elastic contact portion 5.

[0051] Refer to Figure 3 With Figure 5 , Optionally, one end of the elastic conductive component 3 is connected to the radiator 1 by means of screws or riveting. The material of the riveted connection structure is the aluminum material of the radiator 1 itself. The screw connection is made of stainless steel.

[0052] Preferably, the elastic conductive component 3 is connected to the radiator 1 by means of riveting. Compared with the screw connection method, the riveting method has a firm connection, accurate position, excellent contact electrical performance, and no risk of loosening; at the same time, it can avoid problems such as high cost and difficult sealing of screw connections. Optionally, the radiator 1 includes a first riveting member 7, and one end of the elastic conductive component 3 is provided with a second riveting member 8 adapted to the first riveting member 7, so that the elastic conductive component 3 is connected to the radiator 1 by means of riveting. Specifically, the first riveting member 7 is two riveting bosses provided on the radiator 1, and the second riveting member 8 is a conductive plate-like structure 81 provided at one end of the elastic conductive component 3, on which two riveting round holes 811 adapted to the two riveting bosses on the radiator 1 are provided.

[0053] Continue to refer to Figure 4 , Preferably, the elastic conductive component 3 is in the shape of a butterfly-shaped elastic sheet structure. The butterfly-shaped elastic sheet structure includes two conductive elastic sheets 6 and bosses respectively provided at the other ends of the two conductive elastic sheets 6, and the bosses are in interference fit with the windowed area 4; one ends of the two conductive elastic sheets 6 are connected to each other through a conductive plate-like structure 81 and then fixed to the radiator 1. Specifically, two riveting round holes 811 are provided on the conductive plate-like structure 81 for riveting with the riveting bosses on the radiator 1. During installation, the two riveting bosses on the radiator 1 and the two riveting round holes 811 respectively provided on the elastic conductive component 3 are pre-positioned first, and then the two riveting bosses on the radiator 1 are riveted to the butterfly-shaped elastic sheet structure by mechanical extrusion through a riveting device to form a riveted structure. After installation, the acting force and reaction force between the butterfly-shaped elastic sheet structure and the PCB generate a pre-compression elastic force, realizing the interference fit between the conductive elastic sheet and the windowed area of the PCB board and the stable contact between the conductive elastic sheet and the PCB board. Preferably, the two elastic conductive components 3 have an interference of 0.5 mm with the windowed area 4 of the PCB board 2, and a better contact effect can be achieved.

[0054] Preferably, the diameter of the boss of the conductive elastic sheet is 2 ± 0.5 mm, and the diameter of the windowed area 4 ≥ 4.5 mm; at this time, a good interference fit can be achieved between the conductive elastic sheet and the windowed area 4 of the PCB board 2.

[0055] In this embodiment, a certain pre - pressing balance force is generated by pre - pressing two conductive elastic pieces to ensure the force balance of the butterfly - shaped elastic piece structure and the accuracy of the contact position, so as to ensure reliable contact with the window - opening position of the PCB board 2; the two conductive elastic pieces increase the contact stability and reliability, and avoid poor contact between the conductive elastic piece and the window - opening area of the PCB after long - term use of the vehicle, resulting in ESD failure.

[0056] Optionally, in this embodiment, the size of the conductive elastic piece can also be adjusted according to the outer dimensions of different headlight electronic control units (ECUs) to adapt to different distances between the PCB board 2 and the radiator 1, and ensure the reliability of elastic pre - pressing contact with the window - opening area 4 of the PCB board 2.

[0057] Compared with the prior art in which the stamping technology is used to connect the stamping boss of the stamping radiator to the ordinary spring piece riveted on the PCB board, due to the stamping technology, it is impossible to stamp a deeper boss to contact the ordinary spring piece, so it is difficult to ensure the contact reliability; in this application, a conductive elastic component with an appropriate size is configured according to the assembly space, first connected to the radiator by riveting, and then the two elastic contact parts of the conductive elastic component are elastically pre - pressed against the window - opening area of the PCB board; the problem of unreliable contact is avoided, thus ensuring the reliability and stability of the connecting piece.

[0058] The reliable contact structure between the PCB board and the radiator of this application is applicable to radiators that can elastically pre - press - contact with the elastic conductive component, such as die - casting radiators or stamping radiators.

[0059] After many repeated experiments, it is proved that: the sample of the reliable contact structure between the PCB board 2 and the radiator 1 provided by the present utility model can still maintain a reliable connection between the PCB circuit board and the radiator 1 after 300 times of high - low temperature shock tests, high - temperature vibration tests, and mechanical shock tests.

[0060] In summary, the technical solution provided by the present utility model, by setting the elastic conductive component that can be in interference fit with the PCB board between the radiator and the PCB board, increases the contact stability and reliability, avoids poor contact between the elastic piece and the window - opening area of the PCB after long - term use of the vehicle, affecting or causing ESD failure, and effectively ensures the reliable contact between the radiator and the PCB board. The reliable contact structure between the PCB board and the radiator provided by this application is more stable and excellent, the assembly line process is simple, and the material cost is low.

[0061] It should be noted that the embodiments of the present utility model have better implementability and do not impose any form of limitation on the present utility model. Any person skilled in the art may use the disclosed technical content to modify or transform it into equivalent effective embodiments. However, as long as it does not depart from the technical solution of the present utility model, any modification, equivalent change or modification made to the above embodiments based on the technical essence of the present utility model still falls within the scope of the technical solution of the present utility model.

Claims

1. A reliable contact structure between a PCB board and a radiator, comprising a PCB board and a radiator, the PCB board comprising: Window opening area; The radiator is electrically connected to the window opening area; characterized in that, the reliable contact structure between the PCB board and the radiator further includes: An elastic conductive component, disposed between the window opening area and the radiator, one end of the elastic conductive component is electrically connected to the radiator; after the radiator is mounted on the PCB board, the other end of the elastic conductive component is in interference fit with the window opening area of the PCB board.

2. The reliable contact structure between the PCB board and the radiator according to claim 1, characterized in that, The elastic conductive component includes a conductive elastic sheet, one end of the conductive elastic sheet is fixedly connected to the radiator, and the other end of the conductive elastic sheet is in interference fit with the window opening area of the PCB board.

3. The PCB board and heat sink reliable contact structure according to claim 2, characterized in that, The elastic conductive component includes more than one of the conductive elastic sheets.

4. The reliable contact structure between the PCB board and the heat sink according to claim 2, wherein The elastic conductive component includes two of the conductive elastic sheets.

5. The PCB board and heat sink reliable contact structure according to claim 4, characterized in that, The conductive elastic component further includes an elastic contact portion disposed at the other end of the conductive elastic sheet, and the conductive elastic component is in interference fit with the window opening area of the PCB board through the elastic contact portion.

6. The reliable contact structure between the PCB board and the radiator according to claim 5, characterized in that, The elastic conductive component is a butterfly-shaped elastic sheet structure, the butterfly-shaped elastic sheet structure includes two conductive elastic sheets, and elastic contact portions respectively disposed at the other ends of the two conductive elastic sheets, and one ends of the two conductive elastic sheets are connected to each other and then fixed to the radiator.

7. The reliable contact structure between the PCB board and the radiator according to claim 1, wherein One end of the elastic conductive component is connected to the radiator by screws or riveting.

8. The PCB board and heat sink reliable contact structure according to claim 7, characterized in that, The radiator includes a first riveting member, one end of the elastic conductive component is provided with a second riveting member adapted to the first riveting member, and after the first riveting member is connected to the second riveting member, the elastic conductive component is riveted to the radiator.

9. The PCB board and heat sink reliability contact structure according to claim 8, characterized in that, The first riveting member is a riveting boss, the second riveting member is a conductive plate-like structure, and the conductive plate-like structure is provided with a riveting round hole adapted to the riveting boss.

10. The PCB board and heat sink reliable contact structure according to claim 1, characterized in that, The radiator includes a die-cast radiator or a stamping radiator.

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