Power module shielding assembly

Abstract

The utility model discloses a power module shielding assembly, comprising a housing forming an inner concave cavity and an enclosing wall part surrounding the inner concave cavity; the plurality of power modules are arranged in the concave cavity; the composite shielding layer covers the opening of the concave cavity, the lower surface of the composite shielding layer is in surface contact with the upper surface of the power module, and the composite shielding layer comprises a first insulating layer, a first conductive adhesive layer, a nanocrystalline strip layer, an aluminum foil layer, a second conductive adhesive layer and a second insulating layer which are sequentially stacked from bottom to top; the pattern of the nanocrystalline strip layer at least covers the power module; the PCB is attached to the upper surface of the composite shielding layer, the composite shielding layer is provided with a through hole for a probe of the PCB to penetrate through, and the inner wall of the through hole is wrapped by the hole wall insulating layer. According to the utility model, the anti-electromagnetic interference capability of the product can be improved, the ultra-thin space occupation is realized, the grounding effect is realized through the connection of the aluminum foil and the shell, and the electromagnetic shielding capability is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of electric control components, in particular to a power module shielding component. Background Art

[0002] In existing power circuit products, in order to shield electromagnetic radiation and prevent the control function of the PCB from being interfered with, a metal bracket is usually set between the PCB and the power module to achieve electromagnetic shielding. However, the metal bracket cannot be insulated, and sufficient electrical clearance needs to be left in the design, making the overall volume of the bracket larger; in addition, the metal bracket in the prior art is usually thicker and heavier, and its electromagnetic shielding effect is also average.

[0003] In view of the above defects, the utility model proposes a new power module shielding component. Utility Model Content

[0004] In response to the problems in the prior art, the purpose of the utility model is to provide a power module shielding assembly, which overcomes the difficulties of the prior art, can improve the product's anti-electromagnetic interference capability while achieving ultra-thin space occupancy, and achieves a grounding effect through the connection between aluminum foil and the shell, thereby greatly improving the electromagnetic shielding capability.

[0005] The utility model provides a power module shielding component, comprising:

[0006] A shell body, forming a concave cavity and a wall portion surrounding the concave cavity;

[0007] A plurality of power modules are arranged in the inner concave cavity;

[0008] a composite shielding layer, covering the opening of the inner concave cavity, wherein the lower surface of the composite shielding layer is in surface contact with the upper surface of the power module, and the composite shielding layer comprises a first insulating layer, a first conductive adhesive layer, a nanocrystalline ribbon layer, an aluminum foil layer, a second conductive adhesive layer and a second insulating layer stacked in sequence from bottom to top, and the pattern of the nanocrystalline ribbon layer at least covers the power module;

[0009] The PCB board is attached to the upper surface of the composite shielding layer. The composite shielding layer is provided with a through hole for the probe of the PCB board to pass through. The inner wall of the through hole is covered by a hole wall insulating layer.

[0010] Preferably, the nanocrystalline strip layer in the composite shielding layer and the shell together form a shielding cavity for the power module.

[0011] Preferably, the lower surface of the first insulating layer is attached to the upper surface of the power module.

[0012] Preferably, the pattern of the first conductive adhesive layer overlaps with the pattern of the nanocrystalline ribbon layer.

[0013] Preferably, an annular insulating gap surrounding the outer circumference of the combined layer is formed between the edge of the combined layer of the first conductive adhesive layer and the nanocrystalline tape layer and the first insulating layer and the aluminum foil layer.

[0014] Preferably, the aluminum foil layer further includes a plurality of extended protrusions extending outward, and the lower surfaces of the extended protrusions are attached to the upper surface of the surrounding wall portion.

[0015] Preferably, the extended protrusion is a rectangular pattern or a stripe pattern.

[0016] Preferably, the pattern of the first insulating layer overlaps with the inner concave cavity.

[0017] Preferably, patterns of the first insulating layer, the second conductive adhesive layer and the second insulating layer overlap.

[0018] Preferably, the composite shielding layer is also provided with a screw hole, which is connected to the screw socket of the concave cavity by bolts.

[0019] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0020] The power module shielding component of the utility model can improve the anti-electromagnetic interference capability of the product while achieving ultra-thin space occupancy, and realizes a grounding effect by connecting the aluminum foil and the shell, thereby greatly improving the electromagnetic shielding capability.

[0021] To further understand the features and technical contents of the present application, please refer to the following detailed description and drawings of the present application. However, the detailed description and drawings here are only used to illustrate the present application and do not impose any limitations on the scope of the claims of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0023] Figure 1 It is a cross-sectional view of the power module shielding assembly of the present utility model.

[0024] Figure 2 It is a stereoscopic diagram of the composite shielding layer in the power module shielding assembly of the utility model.

[0025] Figure 3 It is a partial cross-sectional view of the composite shielding layer in the power module shielding assembly of the utility model.

[0026] Reference numerals

[0027] 1 Housing

[0028] 11 Wall Department

[0029] 2 Power Module

[0030] 3 Composite shielding layer

[0031] 31 First insulation layer

[0032] 32 First conductive adhesive layer

[0033] 33 Nanocrystalline ribbon layer

[0034] 34 Aluminum foil layer

[0035] 341 Extended protrusion

[0036] 35 Second conductive adhesive layer

[0037] 36 Second insulation layer

[0038] 37 Through Holes

[0039] 38 Hole wall insulation layer

[0040] 39 Annular insulation gap

[0041] 4 PCB board DETAILED DESCRIPTION

[0042] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through other different specific implementation methods, and the details in the present application can also be modified or changed in various ways according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0043] The following is a detailed description of the embodiments of the present application with reference to the accompanying drawings so that those skilled in the art can easily implement the present application. The present application can be embodied in a variety of different forms and is not limited to the embodiments described herein.

[0044] In the representations of the present application, the representations with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the represented specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples represented in the present application and the features of the different embodiments or examples, unless they contradict each other.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In order to clearly describe the present application, components irrelevant to the description are omitted, and the same reference symbols are given to the same or similar components throughout the specification.

[0047] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0048] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly" on another device, there are no other devices between it.

[0049] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0050] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present application. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0051] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which this application belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the relevant technical literature and the contents of the current disclosure, and unless defined, shall not be overly interpreted as ideal or very formal meanings.

[0052] Figure 1 It is a cross-sectional view of the power module shielding assembly of the present utility model. Figure 2 It is a stereoscopic diagram of the composite shielding layer in the power module shielding assembly of the utility model. Figure 3 FIG. 1 is a partial cross-sectional view of the composite shielding layer in the power module shielding assembly of the utility model. Figures 1 to 3As shown, the power module shielding assembly of the utility model comprises: a shell 1, a plurality of power modules 2, a composite shielding layer 3 and a PCB board 4. The shell 1 forms an inner concave cavity and a wall portion 11 surrounding the inner concave cavity. The plurality of power modules 2 are arranged in the inner concave cavity. The composite shielding layer 3 covers the opening of the inner concave cavity, and the lower surface of the composite shielding layer 3 forms a surface contact with the upper surface of the power module 2. The composite shielding layer 3 comprises a first insulating layer 31, a first conductive adhesive layer 32, a nanocrystalline ribbon layer 33, an aluminum foil layer 34, a second conductive adhesive layer 35 and a second insulating layer 36 stacked in sequence from bottom to top, and the pattern of the nanocrystalline ribbon layer 33 at least covers the power module 2. The PCB board 4 is attached to the upper surface of the composite shielding layer 3, and the composite shielding layer 3 is provided with a through hole 37 for the probe of the PCB board 4 to pass through, and the inner wall of the through hole 37 is covered by a hole wall insulating layer 38. The power module shielding assembly of the utility model can provide a composite shielding layer 3 between the power module and the PCB in the pure electric vehicle / hybrid motor controller, which can achieve high-voltage insulation and electromagnetic shielding, improve the product's anti-electromagnetic interference ability, and achieve ultra-thin space occupancy, and have the characteristics of ultra-low cost and ultra-light weight. At the same time, this composite shielding layer 3 has a backing adhesive that can be self-fixed and grounded without additional fixation, and can play a role in resisting vibration.

[0053] In a preferred embodiment, the nanocrystalline ribbon layer 33 in the composite shielding layer 3 and the housing 1 together form a shielding cavity for the power module 2 , but the present invention is not limited thereto.

[0054] In a preferred embodiment, the lower surface of the first insulating layer 31 is attached to the upper surface of the power module 2 , but not limited thereto.

[0055] In a preferred embodiment, the pattern of the first conductive adhesive layer 32 overlaps with the pattern of the nanocrystalline ribbon layer 33 , but the present invention is not limited thereto.

[0056] In a preferred embodiment, the edge of the combined layer of the first conductive adhesive layer 32 and the nanocrystalline tape layer 33 and the first insulating layer 31 and the aluminum foil layer 34 form an annular insulating gap 39 around the outer periphery of the combined layer, but the present invention is not limited thereto.

[0057] In a preferred embodiment, the aluminum foil layer 34 further includes a plurality of extended protrusions 341 extending outward, and the lower surfaces of the extended protrusions 341 are in contact with the upper surface of the surrounding wall portion 11 , but the present invention is not limited thereto.

[0058] In a preferred embodiment, the extended protrusion 341 is in a rectangular pattern or a stripe pattern, but is not limited thereto.

[0059] In a preferred embodiment, the pattern of the first insulating layer 31 overlaps with the inner concave cavity, but is not limited thereto.

[0060] In a preferred embodiment, the patterns of the first insulating layer 31 , the second conductive adhesive layer 35 and the second insulating layer 36 overlap, but the present invention is not limited thereto.

[0061] In a preferred embodiment, the composite shielding layer 3 is further provided with a screw hole (not shown in the figure), which is connected to the screw seat of the inner concave cavity by bolts, but the present invention is not limited thereto.

[0062] The specific implementation of the utility model is as follows:

[0063] Continue to refer Figures 1 to 3In the power module shielding assembly of the utility model, the shell 1 forms an inner concave cavity and a wall portion 11 surrounding the inner concave cavity. A plurality of power modules 2 are arranged in the inner concave cavity. The composite shielding layer 3 covers the opening of the inner concave cavity, and the lower surface of the composite shielding layer 3 forms a surface contact with the upper surface of the power module 2. The composite shielding layer 3 includes a first insulating layer 31, a first conductive adhesive layer 32, a nanocrystalline tape layer 33, an aluminum foil layer 34, a second conductive adhesive layer 35 and a second insulating layer 36 stacked in sequence from bottom to top. The pattern of the nanocrystalline tape layer 33 at least covers the power module 2. The PCB board 4 is attached to the upper surface of the composite shielding layer 3. The composite shielding layer 3 is provided with a through hole 37 for the probe of the PCB board 4 to pass through, and the inner wall of the through hole 37 is covered by a hole wall insulating layer 38. Signal needles with high voltage pass through these holes, and the side walls of the holes are wrapped with high-voltage insulating tape to minimize the opening size and improve the electromagnetic shielding capability. The aluminum foil of the composite shielding layer 3 can use copper foil, and different substrates can be selected according to different needs. The magnetic field shielding layer of the composite shielding layer 3 can use materials such as amorphous / ferrite, and different substrates can be selected according to different needs. The shielding substrate of the composite shielding layer 3 can use one or more, and different substrates can be selected according to different needs. The composite shielding layer 3 can also be attached to the PCB, not necessarily on the power module, as long as there is electromagnetic emission. The grounding fixing method of the composite shielding layer 3 is not limited, and can also be bolts / riveting / crimping, etc. The composite shielding layer 3 is attached between the power module and the PCBA to shield the source of electromagnetic interference. In addition, the first insulating layer 31 and the second insulating layer 36 are both high-voltage insulating tapes. The nanocrystalline strip layer 33 in the composite shielding layer 3 and the shell 1 are surrounded to form a shielding cavity for the power module 2. The composite shielding layer 3 is attached to the shell by conductive adhesive to realize the grounding function of the composite shielding layer 3, and the electromagnetic noise source of the power module can be formed into a sealed cavity, thereby strengthening the electromagnetic shielding. The lower surface of the first insulating layer 31 is attached to the upper surface of the power module 2. The pattern of the first conductive adhesive layer 32 overlaps the pattern of the nanocrystalline strip layer 33. The edge of the combined layer of the first conductive adhesive layer 32 and the nanocrystalline ribbon layer 33, the first insulating layer 31, and the aluminum foil layer 34 form a ring-shaped insulating gap 39 around the outer periphery of the combined layer. The aluminum foil layer 34 also includes a plurality of extended protrusions 341 extending outward, and the lower surface of the extended protrusions 341 is attached to the upper surface of the surrounding wall portion 11. The extended protrusions 341 are rectangular patterns or strip patterns, and the extended protrusions 341 are attached to the shell through conductive adhesive to achieve grounding, thereby greatly improving the electromagnetic shielding capability.

[0064] The power module shielding component of the utility model forms a flexible, lightweight, ultra-low-cost and self-fixing composite shielding layer 3 by using a stacked combination of aluminum foil + conductive adhesive + nanocrystalline strip + high-voltage insulating tape + adhesive composite material. In the utility model, the nanocrystalline strip substrate achieves a better magnetic field shielding effect than aluminum / iron, and the aluminum foil substrate + conductive adhesive grounding achieves an electric field shielding effect. The combination of the two can achieve double shielding of the electromagnetic field. In addition, the thinnest thickness feasible for manufacturing is confirmed by simulation simulation to minimize weight and volume; the optimal opening position and size at the thinnest thickness is confirmed by simulation topology optimization. In the utility model, the use of high-voltage insulating tape to cover and wrap makes it unnecessary to consider electrical clearance during design, greatly improves space utilization, and the size of the opening on the composite shielding layer 3 can also be compressed to a minimum, thereby improving the electromagnetic shielding effect; the composite shielding layer 3 forms a sealed cavity with the shell below the power module to improve the electromagnetic shielding capability; the grounding effect can be achieved by connecting the aluminum foil and the shell.

[0065] In summary, the power module shielding component of the utility model can improve the product's anti-electromagnetic interference capability while achieving ultra-thin space occupancy, and achieves a grounding effect by connecting the aluminum foil and the shell, thereby greatly improving the electromagnetic shielding capability.

[0066] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A power module shielding assembly, characterized in that: include: A housing (1) forming an inner concave cavity and a surrounding wall portion (11) surrounding the inner concave cavity; A plurality of power modules (2) are arranged in the inner concave cavity; A composite shielding layer (3) covers the opening of the inner concave cavity, the lower surface of the composite shielding layer (3) forms surface contact with the upper surface of the power module (2), the composite shielding layer (3) comprises a first insulating layer (31), a first conductive adhesive layer (32), a nanocrystalline ribbon layer (33), an aluminum foil layer (34), a second conductive adhesive layer (35) and a second insulating layer (36) stacked in sequence from bottom to top, and the pattern of the nanocrystalline ribbon layer (33) at least covers the power module (2); A PCB board (4) is attached to the upper surface of the composite shielding layer (3); the composite shielding layer (3) is provided with a through hole (37) for a probe of the PCB board (4) to pass through; the inner wall of the through hole (37) is covered by a hole wall insulation layer (38).

2. The power module shielding assembly according to claim 1, characterized in that: The nanocrystalline strip material layer (33) in the composite shielding layer (3) and the shell (1) together form a shielding cavity for the power module (2).

3. The power module shielding assembly according to claim 1, characterized in that: The lower surface of the first insulating layer (31) is attached to the upper surface of the power module (2).

4. The power module shielding assembly according to claim 1, characterized in that: The pattern of the first conductive adhesive layer (32) overlaps with the pattern of the nanocrystalline ribbon layer (33).

5. The power module shielding assembly according to claim 4, characterized in that: An annular insulating gap (39) surrounding the outer periphery of the combined layer is formed between the edge of the combined layer of the first conductive adhesive layer (32) and the nanocrystalline ribbon layer (33) and the first insulating layer (31) and the aluminum foil layer (34).

6. The power module shielding assembly according to claim 1, characterized in that: The aluminum foil layer (34) further comprises a plurality of extended protrusions (341) extending outwards, and the lower surfaces of the extended protrusions (341) are attached to the upper surface of the surrounding wall portion (11).

7. The power module shielding assembly according to claim 6, characterized in that: The extended protrusion (341) is in a rectangular pattern or a stripe pattern.

8. The power module shielding assembly according to claim 1, characterized in that: The pattern of the first insulating layer (31) overlaps with the inner concave cavity.

9. The power module shielding assembly according to claim 8, characterized in that: The patterns of the first insulating layer (31), the second conductive adhesive layer (35) and the second insulating layer (36) overlap.

10. The power module shielding assembly according to claim 1, characterized in that: The composite shielding layer (3) is also provided with a screw hole, which is connected to the screw connection seat of the inner concave cavity through a bolt.

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