CN220457641U - PCB assembly - Google Patents

Abstract

The present utility model relates to a PCB assembly comprising: a PCB (5); an electrical component; a fixing structure (3). The electrical component is arranged on the PCB (5) and is electrically connected to an electrical circuit of the PCB (5). The PCB assembly further comprises a connection structure (4), and at least one of the electrical components is configured to be connected to the fixation structure (3) by means of the connection structure (4). According to the present utility model, resonance of the PCB assembly is improved without enlarging the area of the PCB.

Description

PCB assembly

Technical Field

The present utility model relates to the field of integrated variable frequency drives, and in particular to a PCB assembly that improves in resonance.

Background

This section provides background information related to the present utility model, which does not necessarily constitute prior art.

In the frequency conversion driver integrated design, a large-mass element having a relatively large mass, such as a PFC (power factor correction) reactor or an EMI (electromagnetic interference) reactor, needs to be mounted on a PCB (printed circuit board). During transport or use, the PCB assembly may be subjected to large shock and mechanical impact. Since the large mass element itself is soldered relatively firmly to the PCB by means of the relatively thick and stable pins, it causes a large displacement or deformation of the substrate of the PCB upon shock and mechanical impact, thereby causing peripheral elements, in particular relatively small mass elements, to be subjected to stresses due to the large displacement or deformation of the substrate of the PCB, with the risk that the solder joints or pins will break and fail.

In the related art, the risk of the above-mentioned fracture failure is reduced by connecting the PCB with the fixed structure around the large mass element. However, this connection method requires an increase in the area of the PCB because the screws are added to the PCB to maintain an electrical distance on the PCB.

Disclosure of Invention

The present utility model provides a PCB assembly that achieves improved resonance of the PCB assembly without enlarging the area of the PCB, in particular, improves the resonance frequency, thereby reducing deformation or displacement of the substrate of the PCB when subjected to shock and impact, reducing stress experienced by the PCB and related electrical components (in particular, other components at the periphery of the massive component) and thereby reducing the risk of solder joints or pin breakage failure of the related electrical components.

The present utility model provides a PCB assembly comprising: a PCB; an electrical component; and a fixing structure. The electrical component is disposed on the PCB and is electrically connected to an electrical circuit of the PCB. The PCB assembly further comprises a connection structure, and at least one of the electrical components is configured to be connected to the fixation structure by means of the connection structure.

In the above PCB assembly, the electrical element includes a small-mass element having a smaller mass and a large-mass element having a larger mass, the large-mass element being configured to be connected to the fixing structure by means of the connection structure.

In the above PCB assembly, the large mass element and the fixing structure are arranged on opposite sides of a substrate of the PCB, the large mass element including a base configured to be connected to the fixing structure by means of the connection structure.

In the above PCB assembly, the connection structure includes a support member, a substrate of the PCB has a substrate through hole, and the support member is configured to be connected with the base and the fixing structure through the substrate through hole.

In the above PCB assembly, the support member is configured to be disposed between and connected with the base and the fixing structure in contact with a lower surface of the base and an upper surface of the fixing structure.

In the above PCB assembly, the base has a base through hole, the support member has an inner hole, the support member is arranged such that the inner hole is aligned with the base through hole, and the connection structure further includes a screw connector extending through the base through hole into the inner hole.

In the above PCB assembly, the internal bore is a through hole, and the threaded connector further extends through the internal bore into the securing structure.

In the above PCB assembly, the support member is rigid or flexible.

In the above PCB assembly, the screw connector is screw-coupled to the inner hole, and the support member has a bottom screw portion and is screw-coupled to the fixing structure by means of the bottom screw portion.

In the above PCB assembly, the PCB assembly is configured such that an inner circumferential surface of the substrate through hole is not in contact with an outer circumferential surface of the support member.

In the above PCB assembly, the fixing structure is a heat sink or a plastic tray constituting a part of a housing of the PCB assembly.

In the above PCB assembly, the connection structures are disposed at four corners of the chassis.

In the above PCB assembly, two of the support members located on one diagonal are rigid, and two of the support members located on the other diagonal are flexible.

In the above PCB assembly, the support member includes a flexible portion and a rigid portion.

In the above PCB assembly, the rigid portion is located on the inner side, and the flexible portion is located on the outer side surrounding the rigid portion; or the rigid part is positioned at the lower side and connected with the fixed structure, and the flexible part is positioned at the upper side and connected with the base.

In the above PCB assembly, the large mass element includes a PFC reactor and an EMI reactor.

According to the utility model, the PCB assembly comprises a connection structure and at least one electrical component, in particular a high mass component, is configured to be connected to the fixation structure by means of the connection structure. Thus, the local rigidity of the electrical component on the PCB assembly is increased, so that resonance (for example, the resonance frequency is increased to avoid occurrence of resonance) can be improved, and at the same time, there is no need to additionally provide a screw connection structure at an area (non-overlapping area) other than the electrical component, thereby causing an increase in the area of the PCB without consideration of the electrical distance.

Drawings

The accompanying drawings show, by way of example only, the related art and some embodiments of the present utility model, but the present utility model is not limited to the embodiments shown in the drawings.

Fig. 1 shows a perspective view of a PCB assembly in the related art.

Fig. 2 is a partial perspective view schematically illustrating a PCB assembly according to the present utility model.

Fig. 3 is a partial side view schematically illustrating a PCB assembly according to the present utility model.

Fig. 4 is a top view illustrating a PCB assembly according to the present utility model.

Fig. 5 is a cross-sectional view taken along section C-C in fig. 4 showing a PCB assembly according to one embodiment of the present utility model in which a threaded connector extends through a portion of a support member.

Fig. 6 is a cross-sectional view taken along section C-C in fig. 4 showing a PCB assembly according to another embodiment of the present utility model in which a threaded connector extends through a support member into a fixed structure.

Detailed Description

Hereinafter, a PCB assembly in the related art and preferred embodiments of the PCB assembly according to the present utility model will be described with reference to the accompanying drawings.

A perspective view of a PCB assembly in the related art is shown in fig. 1. In the related art, in order to reduce the risk of pin breakage failure of each element other than the large-mass element, through holes 1 (two through holes are exemplarily shown in fig. 1) are provided on the PCB 5 around the large-mass element and screw holes are provided at corresponding positions in the fixing structure under the PCB 5, and screw connectors are screwed into the screw holes in the fixing structure 3 through the through holes 1, thereby connecting the PCB 5 with the fixing structure 3. In this way, the PCB 5 is connected to the fixing structure 3 by forming the through hole on the PCB 5, and the corresponding electrical distance needs to be reserved on the PCB 5 due to the additional through hole on the PCB 5, so that the area of the PCB 5 needs to be enlarged.

Compared with the PCB assembly in the related art, the utility model reduces the risk of pin fracture failure without enlarging the area of the PCB, so that the structure of the PCB assembly is more compact.

Hereinafter, the region on the substrate of the PCB 5 where the mounts 22 of the large mass elements 2 are stacked is referred to as an overlap region, and the region on the substrate of the PCB 5 where the mounts 22 of the large mass elements 2 are not mounted is referred to as a non-overlap region.

In the present utility model, it is not necessary to additionally provide a through hole for the threaded connector to pass through in the PCB at the non-overlapping region, but the large mass element is connected (fixedly connected) with the fixing structure at the overlapping region by the connecting structure. Thus, since the through holes do not need to be added at the non-overlapping region, an increase in the area of the PCB due to both the increase in the through holes and the electrical distance that must be considered due to the addition of the through holes is avoided, as compared with the related art.

Fig. 2 to 6 show various views of the PCB assembly of the present utility model. The PCB assembly comprises a PCB 5, electrical components and connection structures 4. The electrical components include a large-mass component (e.g., PFC reactor and EMI reactor) and other components (i.e., a small-mass component having a small mass) mounted on the PCB 5 and electrically connected to the electrical wiring of the PCB 5. In a preferred embodiment, the large mass element is configured to be connected to the fixed structure 3 by means of the connection structure 4 in such a way that the resonance can be improved more effectively by fixedly connecting the large mass element to the fixed structure and thus avoiding the influence on the PCB and other electrical elements attached thereto, such as small mass elements, as the vibrations of the large mass element have a greater influence on the PCB. However, it will be appreciated that in the present utility model, other elements may also be configured to be connected to the fixed structure 3 by means of the connecting structure 4, in which case the local stiffness of the other elements may also be increased to also help avoid resonance. That is, in the present utility model, as long as at least one electrical component is connected to the fixed structure 3 by means of the connection structure 4, it is possible to improve resonance and reduce the risk of pin/pad breakage.

The connection structure 4 includes a threaded connection 41 and a support member 42. The large mass element 2 comprises an element body 21 and a base 22. Through holes (i.e., aligned base through holes and substrate through holes) are provided at corresponding positions of the base 22 and the PCB 5. The mass element 2 is electrically connected to the PCB 5 by pins 23.

As shown in fig. 3, the large mass element 2 and the fixed structure 3 may be arranged on opposite sides of the substrate of the PCB 5. The mass element 2 may comprise a base 22, the base 22 being configured to be connected to the fixed structure 3 by means of the connection structure 4. In particular, the support member 42 is configured to be connected with the base 22 and the fixed structure 3 through a through hole (substrate through hole) of the substrate of the PCB 5, in such a way that, for an arrangement in which the large mass element 2 and the fixed structure 3 are arranged on opposite sides of the substrate of the PCB 5, the large mass element 2 can also be skillfully connected to the fixed structure 3 by the connection structure 4.

In a preferred embodiment, the support member 42 is disposed between the base 22 and the fixing structure 3 in contact with the lower surface of the base 22 and the upper surface of the fixing structure 3, i.e., the upper and lower end surfaces of the support member 42 are respectively in contact with the lower surface of the base 22 and the upper surface of the fixing structure 3, and the screw connector 41 sequentially extends through the through hole of the base 22 and at least a portion of the inner hole of the support member 42 (the support member 42 is disposed such that the inner hole is aligned with the base through hole), more specifically, the screw connector 41 sequentially extends through the through hole of the base 22, a portion of the support member 42 located in the through hole of the substrate of the PCB 5, and at least a portion of the remaining portion of the support member 42.

The inner bore of the support member 42 may be a threaded bore and may be a through bore (in the case of a through bore, the inner bore may not be a threaded bore) or a blind bore.

When the internal bore in the support member 42 is a through hole, the threaded connection 41 may extend through the entire support member 42 into a threaded bore of the fixed structure 3 (which requires a threaded bore to be provided at a corresponding location of the fixed structure 3). As shown in fig. 6. The extension of the threaded connection 41 through the entire support part 42 can provide a more secure connection between the large mass element and the fixed structure 3 than a portion extending through the support part 42, which increases the local stiffness of the large mass element, thereby further contributing to improved resonance.

In some embodiments, the support member 42 is rigid, e.g., made of metal. When the support member 42 is rigid, since both ends of the support member 42 are in contact with the base 22 and the fixed structure 3, respectively, it is possible to advantageously function as a support when a shock is generated, transmit a force to the fixed structure while maintaining a distance between the base 22 and the fixed structure 3 and cooperatively provide a stable connection between the mass element 2 and the fixed structure 3 in cooperation with the screw connection 41.

In other embodiments, the support member 42 may also be flexible, such as made of rubber. When the support member 42 is flexible, it is preferred to have the threaded connection 41 extend through the entire support member 42 into the fixed structure 3 to ensure a rigid connection between the mass element 2 and the fixed structure 3. The use of flexible support members 42 is advantageous in that damping at specific vibration frequencies is increased, thereby reducing the risk of PCB deformation and pin breakage failure of other components.

Preferably, in the connected state, the inner circumferential surface of the through hole of the PCB 5 is not in contact with the outer circumferential surface of the support member 42 extending therethrough, i.e., there is a gap between the inner circumferential surface of the through hole of the PCB 5 and the outer circumferential surface of the support member 42. In this way, transmission of vibrations of the mass element to the PCB can be advantageously avoided. In addition, for the rigid support member 42, such a gap may prevent the electrical circuit of the PCB from being grounded due to the rigid support member 42. In the present utility model, by properly positioning the PCB, by properly positioning the connection structure, and by configuring the substrate through hole to be relatively large, it is possible to achieve that a gap exists between the inner peripheral surface of the substrate through hole of the PCB 5 and the outer peripheral surface of the support member 42.

The fixed structure 3 may be a heat sink or a plastic tray (in particular, a large plastic tray forming part of the housing of the PCB assembly). In this way, the heat sink or plastic tray that is originally present is utilized as the fixing structure, so that the fixing structure for fixing does not need to be additionally added, which simplifies the overall structure of the PCB assembly.

The base 22 of the large mass element 2 may be rectangular as shown in the figures, and the connection structures 4 are arranged at the four corners of the rectangle. The support members 42 of the connection structure 4 provided at the four corners may be a combination of rigid support members 42 and flexible support members 42, for example, two support members 42 provided on one diagonal line are flexible and the other two support members 42 provided on the other diagonal line are rigid, but the combination of the rigid support members 42 and the flexible support members 42 is not limited thereto. In this way, reasonable vibration resistance can be achieved depending on the specific vibration conditions of a specific application. In addition, the shape of the base 22 may be provided in any desired shape as desired.

In another embodiment, the single support member 42 may have a rigid portion and a flexible portion, e.g., the upper portion of the support member 42 is a flexible portion and the lower portion is a rigid portion, in which case the threaded connection 41 extends through at least a portion of the rigid portion. In this way, the lower rigid portion may advantageously be connected with a fixed structure (such as a threaded connection), while the upper flexible portion may be connected with the base and pass through the substrate through-hole to avoid the support member from electrically communicating with the PCB or from transmitting vibrations to the PCB. Alternatively, the rigid portion is located on the inside and the flexible portion is located on the outside surrounding the rigid portion in such a way that both the rigidity of the support member 42 is maintained and the threaded connection with the threaded connection is facilitated, and the support member can be prevented from being in electrical communication with the PCB or from transmitting vibrations to the PCB by the flexible portion on the outside.

In other embodiments that are conceivable, the connection structure may comprise only a threaded connection 41, which threaded connection 41 extends through a through hole (preferably a threaded hole) of the base 22, a through hole of the PCB 5 into a threaded hole of the fixation structure 3. In this embodiment, preferably, the outer circumferential surface of the screw connector 41 is not in contact with the inner circumferential surface of the through hole of the PCB 5.

In some embodiments, the upper surface of the fixed structure 3 may be provided with an annular groove for receiving and positioning the lower end of the support member 42 to achieve an accurate and reliable connection of the lower end of the support member 42 with the fixed structure 3. Furthermore, an internal thread may be provided in the annular groove, and an external thread is provided at a corresponding section of the support member 42 (i.e. the support member 42 may have a bottom threaded portion) to further provide a secure connection between the fixation structure 3 and the support member 42 by screwing a portion of the support member 42 into the annular groove.

The utility model is susceptible of various modifications.

For example, although in the foregoing, a connection structure including a threaded connection and a support member is specifically described, other possible connection structures (e.g., a base of a large mass element and a metal post fixedly connected to a heat sink by welding) are conceivable as long as such connection structure is capable of fixedly connecting the large mass element to the heat sink.

For another example, it is also contemplated that the threaded connection may be omitted, and the support member configured such that the upper and lower ends are directly threaded to the base and heat sink, respectively, of the large mass element.

For another example, although in the above, it is specifically described that the large mass element and the fixing structure are arranged on opposite sides of the substrate of the PCB, the present utility model is not limited to this arrangement as long as the large mass element is electrically connected with the PCB while the large mass element is fixedly connected with the fixing structure.

While the present utility model has been described with reference to exemplary embodiments, it is to be understood that the utility model is not limited to the specific embodiments described and illustrated herein, and that various changes in the exemplary embodiments may be made by those skilled in the art without departing from the scope defined by the claims.

Claims (16)

1. A PCB assembly, comprising:

PCB；

an electrical component; and

the fixing structure is provided with a fixing structure,

wherein the electrical component is arranged on the PCB and is electrically connected with an electrical circuit of the PCB,

characterized in that the PCB assembly further comprises a connection structure and at least one of the electrical components is configured to be connected to the fixation structure by means of the connection structure.

2. The PCB assembly of claim 1, wherein the electrical component comprises a small mass component having a smaller mass and a large mass component having a larger mass, the large mass component being configured to be connected to the fixed structure by means of the connection structure.

3. The PCB assembly of claim 2, wherein the large mass element and the securing structure are arranged on opposite sides of a substrate of the PCB, the large mass element comprising a base configured to be connected to the securing structure by means of the connecting structure.

4. A PCB assembly according to claim 3, wherein the connection structure comprises a support member, the base plate of the PCB having a base plate through hole, the support member being configured to connect with the base plate and the fixation structure through the base plate through hole.

5. The PCB assembly of claim 4, wherein the support member is configured to be disposed between and connected with the base and the fixed structure in contact with a lower surface of the base and an upper surface of the fixed structure.

6. The PCB assembly of claim 5, wherein:

the base having a base through hole, the support member having an inner hole, the support member being arranged such that the inner hole is aligned with the base through hole,

the connection structure further includes a threaded connection extending through the base through hole into the bore.

7. The PCB assembly of claim 6, wherein the bore is a through hole, the threaded connector further extending through the bore into the securing structure.

8. The PCB assembly of any of claims 4-7, wherein the support member is rigid or flexible.

9. The PCB assembly of claim 6, wherein the threaded connector is threaded to the inner bore, the support member having a bottom threaded portion and being threaded to the securing structure by means of the bottom threaded portion.

10. The PCB assembly of any one of claims 4 to 7 and 9, wherein the PCB assembly is configured such that an inner peripheral surface of the substrate through hole is not in contact with an outer peripheral surface of the support member.

11. The PCB assembly of any one of claims 1 to 7 and 9, wherein the securing structure is a heat sink or a plastic tray forming part of a housing of the PCB assembly.

12. The PCB assembly of any one of claims 4-7, wherein the connection structures are disposed at four corners of the chassis.

13. The PCB assembly of claim 12, wherein two of the support members located on one diagonal are rigid and two of the support members located on the other diagonal are flexible.

14. The PCB assembly of any of claims 4-7 and 9, wherein the support member comprises a flexible portion and a rigid portion.

15. The PCB assembly of claim 14, wherein:

the rigid portion is located on the inner side, and the flexible portion surrounds the rigid portion and is located on the outer side; or alternatively

The rigid portion is located on the lower side to be connected with the fixed structure, and the flexible portion is located on the upper side to be connected with the base.

16. The PCB assembly of any of claims 2-7 and 9, wherein the large mass element comprises a PFC reactor and an EMI reactor.