CN112423573A - Electromagnetic protection device - Google Patents
Electromagnetic protection device Download PDFInfo
- Publication number
- CN112423573A CN112423573A CN201910770253.XA CN201910770253A CN112423573A CN 112423573 A CN112423573 A CN 112423573A CN 201910770253 A CN201910770253 A CN 201910770253A CN 112423573 A CN112423573 A CN 112423573A
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- protection
- cover
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- electromagnetic
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- 230000001681 protective effect Effects 0.000 claims abstract description 68
- 239000004020 conductor Substances 0.000 claims description 6
- 230000005670 electromagnetic radiation Effects 0.000 abstract description 4
- 239000002184 metal Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/002—Casings with localised screening
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention provides an electromagnetic protection device, which comprises a protection shell, a protection cover, a protected component, a connector and a shielding cover, wherein the shielding cover is arranged on the protection shell; the protective shell is fixedly connected with the protective cover to form a first space; the protected component is positioned in the first space, and the connector is connected to one end of the protected component; the shielding cover isolates the protected component from the connector; the protective cover is provided with a first protective part close to the shielding cover, the first protective part is provided with at least one groove, and the end part of the shielding cover close to the protective cover is accommodated in the first protective part; the protective housing is provided with a second protective part close to the shielding case, the second protective part is provided with at least one groove, and the end part of the shielding case close to the protective housing is accommodated in the second protective part. By the technical scheme, the problem of electromagnetic radiation and interference resistance of electronic devices such as electronic devices and PCB boards can be effectively solved, and electromagnetic protection is realized.
Description
Technical Field
The invention relates to the field of electromagnetic protection, in particular to an electromagnetic protection device.
Background
Electronic equipment such as electron device, circuit board can receive in the course of the work the unable accurate work of interference of electromagnetic signal in the surrounding environment, thereby electronic equipment also can radiate the electromagnetic wave to the surrounding environment in the course of the work simultaneously, thereby disturb other electronic equipment's normal work, consequently have high requirement or receive the electronic equipment who disturbs easily to the signal, like the automotive electronics field, generally need carry out the electromagnetic protection design in order to shield electromagnetic radiation also outwards radiate the electromagnetic wave simultaneously, guarantee the stable accurate operation of circuit. The principle of electromagnetic shielding is that a metal shield shields the far-field of a radiation interference source by reflection and absorption of electromagnetic waves, i.e. simultaneously shields the electric field and the magnetic field components generated by the field source. As the frequency increases, the wavelength becomes comparable to the size of the aperture in the shield, causing the aperture leakage of the shield to be the most critical controlling element of electromagnetic shielding. There are only two factors that actually affect the shielding effectiveness of the shield: one is that the entire shield surface must be electrically continuous and the other is that there cannot be a conductor that penetrates directly through the shield. The shield has a plurality of conductive discontinuities, the most prominent of which is the non-conductive gap formed at the junction of the different parts of the shield. These non-conductive gaps create electromagnetic leakage as if fluid were leaking from the gaps in the container. In the prior art, a gap is filled with a conductive elastic material, a non-conductive point is eliminated, or an elastic metal contact piece is contacted with a metal shell and connected with a metal cover to form a complete metal shell for electromagnetic shielding, but the electromagnetic shielding mode has unstable contact due to vibration, impact and other using environments in the using process, so that an electromagnetic signal cannot be well prevented from entering a working space of electronic equipment, and better electromagnetic shielding cannot be realized. In addition, the EMC protection effect has a great relationship with the contact resistance, and the contact resistance is greatly increased due to the surface oxidation of the metal part, so that the EMC protection effect is reduced.
Therefore, the invention provides an electromagnetic protection device, which adopts the metal shell, the metal cover and the EMC shielding cover to carry out electromagnetic shielding, and through a non-contact electromagnetic protection design, electromagnetic interference is prevented from passing through, and electromagnetic shielding is realized.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide an electromagnetic protection device, which implements electromagnetic protection of a protected component through cooperation of a protection cover, a shielding cover and a protection housing, and effectively solves the problem of electromagnetic radiation and interference resistance of electronic devices, such as electronic devices, PCB circuit boards, and the like.
Specifically, the invention provides an electromagnetic protection device, which comprises a protection cover, a protection shell, a protected component and a connector, and is characterized by further comprising a shielding cover; the protective shell is fixedly connected with the protective cover to form a first space; the protected component is positioned in the first space, and the connector is connected to one end of the protected component; the shielding case isolates the protected component from the connector; the protective cover is provided with a first protective part close to the shielding cover, the first protective part is provided with at least one groove, and the end part of the shielding cover close to the protective cover is accommodated in the first protective part; the protective housing is close to shield cover department is provided with second protection portion, second protection portion has at least one recess, the shield cover is close to protective housing's tip hold in second protection portion.
Preferably, in the above-mentioned device, the protective cover is close to the end of the shield cover and has at least two protective sheets, the protective sheet and the end of the protective cover form a groove to form the first protection portion, and the shield cover is close to one end of the protective cover is accommodated in the first protection portion.
Preferably, in the above apparatus, the two end portions of the protective housing close to the shielding case respectively have at least two protective sheets, the protective sheets and the two end portions of the protective housing respectively form a groove to form the second protective portion, and the end portion of the shielding case close to the protective housing is accommodated in the second protective portion.
Preferably, the above device has a gap between the protective housing and the shield case.
Preferably, the above device has a gap between the protecting cover and the shielding case.
Preferably, in the above device, the shielding cover and the protected component are connected through a fixed connection point, and a gap is formed between the shielding cover and the protected component.
Preferably, the first protection part has a plurality of grooves, and the second protection part has a plurality of grooves.
Preferably, the shielding case in the above device is multilayered.
Preferably, in the above device, the protective housing, the protective cover and the shielding case are made of conductive materials.
Preferably, in the above apparatus, the protected component includes a PCB board and an electronic device disposed on the PCB board.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. the problems of poor contact and the influence of contact resistance on the electromagnetic protection effect caused by the contact type electromagnetic protection design are effectively solved;
2. the power circuit is isolated from the external electromagnetic interference, and the external electromagnetic interference of the internal circuit or the electromagnetic wave emitted by the internal circuit to the external electric equipment is prevented.
Drawings
FIG. 1 is a schematic structural diagram of an electromagnetic shielding apparatus according to a preferred embodiment of the present invention;
FIG. 2 is a schematic longitudinal cross-sectional view of an electromagnetic shielding apparatus in accordance with a preferred embodiment of the present invention;
FIG. 3 is an enlarged view of the first protection portion according to a preferred embodiment of the present invention;
FIG. 4 is a cross-sectional schematic view of an electromagnetic shielding apparatus in accordance with a preferred embodiment of the present invention;
FIG. 5 is an enlarged view of a second protection portion according to a preferred embodiment of the present invention;
FIG. 6 is a diagram of a shield and protected component connection configuration in accordance with a preferred embodiment of the present invention;
fig. 7 is a schematic view of a shield connection point structure according to a preferred embodiment of the present invention.
Reference numerals:
1-protective cover
2-protective housing
3-protected assembly
4-connector
5-Shielding cage
101-first guard
201-first shield
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates 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.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
Referring to fig. 1, a schematic structural diagram of an electromagnetic protection device according to a preferred embodiment of the present invention includes a protection cover 1, a protection housing 2, a protected component 3, a connector 4, and a shielding cover 5, where the protection housing 2 is fixedly connected to the protection cover 1 to form a first space; the protected component 3 is located in the first space, the connector 4 is connected to one end of the protected component, and the shielding case 5 isolates the protected component 3 from the connector 4.
The protected component is any component which needs to be electromagnetically protected, such as a PCB (printed circuit board), an electronic device and the like, and in order to achieve the electromagnetic protection of the protected component, the protected component needs to be completely isolated by a conductive material. The protective cover 1 and the protective housing 2 are made of conductive material, such as metal material, which can effectively prevent electromagnetic signals from passing through, the protective cover 1 and the protective housing 2 are fixedly connected to form a first space, the protected component 3 is located in the first space, generally speaking, the protected component 3 is fixedly connected to the protective housing 2, can be connected by metal screws or other fixed connection methods, a connector 4 is generally connected to one end of the protected component 3 in order to receive external signals, the connector 4 is provided with a signal port, the connector 4 is typically non-conductive so that electromagnetic interference can enter from the end of the connector 4, and to prevent electromagnetic interference, a shielding cover 5 is arranged between the protected component 3 and the connector 4, the shielding cover 5 is made of conductive material, the shielding assembly is completely isolated by the matching of the shielding case 5 with the protecting cover 1 and the protecting shell 2. The electromagnetic protection shell formed by the shielding cover 5, the protective cover 1 and the protective shell 2 can be grounded or ungrounded, and is determined according to the specific circuit connection requirement and the electromagnetic protection requirement.
Fig. 2 is a schematic longitudinal sectional view of an electromagnetic shielding apparatus according to a preferred embodiment of the present invention, and fig. 3 is an enlarged schematic structural view of a first shielding portion according to a preferred embodiment of the present invention. The protecting cover 1 is provided with a first protecting part 101 near the shielding case 5, the first protecting part 101 has at least one groove, and the shape of the first protecting part 101 can be wave shape or bending shape, so long as the groove can be formed. The end that shield cover 5 is close to protective cover 1 holds in first guard portion 101, through this kind of design, can make shield cover 5 still realize electromagnetic protection under the condition with protective cover 1 non-contact, because the design of first guard portion 101 recess, lead to electromagnetic signal can't directly pass through the space between shield cover 5 and the first guard portion 101, but the reflection absorbs, has ensured electromagnetic protection's effect effectively. Under the condition of adopting this kind of electromagnetic protection design, do not restrict shield cover 5 and protective cover 1's first protection portion 101 whether contact or not, can leave clearance or contact between shield cover 5 and the first protection portion 101, when leaving the clearance, the recess of first protection portion 101 can play a role well and carry out electromagnetic protection, during the contact, shield cover 5 and protective cover 1, protecting housing 2 can realize electromagnetic protection, and when the contact is insecure, then be equivalent to the condition of leaving the clearance, the recess of first protection portion 101 can play a role, consequently no matter shield cover 5 and first protection portion 101 contact or not contact can keep apart electromagnetic interference effectively.
Fig. 4 is a cross-sectional view of an electromagnetic shielding apparatus according to a preferred embodiment of the present invention, and fig. 5 is an enlarged structural view of a second shielding portion according to a preferred embodiment of the present invention. Similarly, the protective housing 2 is provided with a second protective portion 201 near the shielding case 5, the second protective portion 201 has at least one groove, and the end of the shielding case 5 near the protective housing 2 is accommodated in the second protective portion 201. The shape of the second protection portion 201 may be a wave shape, a bent shape, or the like, as long as a groove may be formed. Through this kind of design, can make shield cover 5 still realize electromagnetic protection under the condition with protective housing non-contact, because the design of second protection portion 201 recess, lead to electromagnetic signal can't directly pass through the space between shield cover 5 and the second protection portion 201, but the reflection absorbs, has ensured electromagnetic protection's effect effectively. In the case of such an electromagnetic protection design, it is not limited whether the shielding cover 5 contacts or does not contact the second protection portion 201 of the protection housing 2, and a gap or contact may be left between the shielding cover 5 and the second protection portion 201, as described above, electromagnetic interference may be effectively isolated no matter whether the shielding cover 5 contacts or does not contact the second protection portion 201.
The number of the first shield parts 101 on the shield cover 1 is not limited to 1, the number of the second shield parts 201 on the shield case 2 is not limited to 2, in this embodiment, the protecting cover 1 is close to one end of the shielding case 5, the protecting shell 2 is close to both ends of the shielding case 5, therefore, 1 first protecting part 101 is required to be provided on the protecting cover 1 to accommodate the corresponding end portion of the shielding can 5, 2 second protecting parts 201 are required to be provided on the protecting case 2 to accommodate the both end portions of the shielding can 5, thereby realizing electromagnetic shielding, and therefore the number of the first protecting part 101 and the second protecting part 201 depends on the number of the protecting cover 1 and the shielding case 5, and the number of the protecting shell 2 and the shielding case 5, which are respectively close to each other, if the two ends of the protecting cover 1 and the shielding case 5 are respectively close to each other, two corresponding first shields 101 are required on the shield cover 1 to accommodate the two ends of the shield can 5, respectively.
Through being close to shield cover 5 department at protective cover 1 and setting up first guard portion 101, be close to shield cover 5 department at protective housing 2 and set up second guard portion 201, each tip of shield cover holds in first guard portion 101 and second guard portion 201 respectively, leads to electromagnetic signal can not directly pass through but by the reflection absorption, can prevent electromagnetic signal interference effectively, realizes electromagnetic protection.
The first protection portion 101 may be in a wave shape or a bent shape, so long as a groove can be formed, the groove may be integrally formed, such as a bent shape in fig. 3, or non-integrally formed, for example, the protection cover 1 has at least two protection pieces at an end portion close to the shield cover 5, the protection pieces and the end portion of the protection cover 1 form a groove to form the first protection portion 101, and an end of the shield cover 5 close to the protection cover 1 is accommodated in the first protection portion 101. This kind of scheme is in fact through the tip cooperation formation actual recess of protection piece and protective cover 1 and realizes the effect of electromagnetic protection, and the protection piece is the material that can lead to.
Similarly, the shape of the second protection portion 201 may be a wave shape or a bent shape, as long as a groove can be formed, the groove may be integrally formed, such as a bent shape in fig. 5, or may be non-integrally formed, for example, the two end portions of the protection housing 2 close to the shielding case 5 are respectively provided with at least two protection sheets, the protection sheets and the two end portions of the protection housing 2 are respectively formed with a groove to form the second protection portion 201, and the end portion of the shielding case 5 close to the protection housing 2 is accommodated in the second protection portion 201. This kind of scheme is in fact through the tip cooperation formation actual recess of protection piece and protective cover 1 and realizes the effect of electromagnetic protection, and the protection piece is the material that can lead to.
As described above, whether the shielding cover 5 contacts or does not contact the first protecting portion 101 of the protecting cover 1 is not limited, a gap may be left between the shielding cover 5 and the first protecting portion 101 without contacting, the groove of the first protecting portion 101 may function well to achieve electromagnetic protection, and the problem of electromagnetic interference caused by loose contact may be effectively solved.
Similarly, whether the shielding cover 5 contacts or does not contact with the second protection portion 201 of the protection housing 2 is also not limited, a gap can be reserved between the shielding cover 5 and the second protection portion 201 and does not contact with the second protection portion 201, the groove of the second protection portion 201 can well play a role in achieving electromagnetic protection, and the problem of electromagnetic interference caused by insecure contact is effectively solved.
The shielding cover 5 isolates the protected component 3 from the connector 4, the shielding cover 5 can be completely contacted and connected with the protected component 3 without a gap, and in order to make the structure simpler, the shielding cover 5 can also have a gap with the protected component, referring to fig. 6, in order to connect the shielding cover and the protected component according to a preferred embodiment of the present invention, fig. 7 is a diagram of a connection point of the shielding cover, the shielding cover 5 is connected with the protected component 3 through a fixed connection point, the shielding cover 5 has a gap with the protected component 3, and the connection mode is electrical connection, such as welding, press-fit connection, and the like.
In order to improve the electromagnetic protection effect, the first protection part 101 may be provided with a plurality of grooves, and the second protection part 201 is also provided with a plurality of grooves.
On the premise that the first protection part 101 is provided with a plurality of grooves and the second protection part 201 is also provided with a plurality of grooves, the shielding cases 5 can also be arranged into a plurality of layers, and the corresponding end part of each layer of shielding case 5 is correspondingly accommodated in the corresponding groove of the corresponding first protection part 101 and second protection part 201.
The protected component 3 in the invention is any component which needs to be electromagnetically protected, and can be a PCB (printed Circuit Board) and an electronic device arranged on the PCB.
By the design of the electromagnetic protection device, the problem of electromagnetic radiation and interference resistance of electronic devices, such as electronic devices, PCB (printed circuit board) and the like can be effectively solved.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.
Claims (10)
1. An electromagnetic protection device comprises a protection cover, a protection shell, a protected component and a connector, and is characterized by further comprising a shielding cover;
the protective shell is fixedly connected with the protective cover to form a first space;
the protected component is positioned in the first space, and the connector is connected to one end of the protected component;
the shielding case isolates the protected component from the connector;
the protective cover is provided with a first protective part close to the shielding cover, the first protective part is provided with at least one groove, and the end part of the shielding cover close to the protective cover is accommodated in the first protective part;
the protective housing is close to shield cover department is provided with second protection portion, second protection portion has at least one recess, the shield cover is close to protective housing's tip hold in second protection portion.
2. The electromagnetic protection device according to claim 1, wherein the protection cover has at least two protection pieces at an end portion thereof adjacent to the shield cover, the protection pieces and the end portion of the protection cover form a groove to form the first protection portion, and one end of the shield cover adjacent to the protection cover is received in the first protection portion.
3. The electromagnetic protection device according to claim 1, wherein the protection housing has at least two protection sheets respectively disposed at two ends thereof adjacent to the shielding case, the protection sheets and the two ends of the protection housing form grooves respectively to form the second protection portion, and the end of the shielding case adjacent to the protection housing is received in the second protection portion.
4. The electromagnetic shielding device of claim 1 wherein a gap is provided between said shield shell and said shield.
5. The electromagnetic shielding device of claim 1 wherein the shield cover has a gap with the shield can.
6. The electromagnetic shielding apparatus of claim 1 wherein the shield is coupled to the shielded component by a fixed connection point, the shield having a gap with the shielded component.
7. The electromagnetic shielding device of claim 1 wherein said first shielding portion has a plurality of said recesses and said second shielding portion has a plurality of said recesses.
8. The electromagnetic shielding device of claim 7 wherein said shield is multi-layered.
9. The electromagnetic protection device of claim 1, wherein the protective housing, the protective cover, and the shielding case are made of conductive materials.
10. The electromagnetic shielding device of any one of claims 1-9 wherein the shielded component comprises a PCB board and electronics disposed on the PCB board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910770253.XA CN112423573B (en) | 2019-08-20 | 2019-08-20 | Electromagnetic protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910770253.XA CN112423573B (en) | 2019-08-20 | 2019-08-20 | Electromagnetic protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112423573A true CN112423573A (en) | 2021-02-26 |
| CN112423573B CN112423573B (en) | 2022-12-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910770253.XA Active CN112423573B (en) | 2019-08-20 | 2019-08-20 | Electromagnetic protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112423573B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113727593A (en) * | 2021-08-16 | 2021-11-30 | 北京超星未来科技有限公司 | Electromagnetic shielding device of electronic equipment and electronic equipment |
| CN118450691A (en) * | 2024-06-04 | 2024-08-06 | 广东智尚防务科技有限公司 | Automobile electromagnetic protection device |
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| CN113727593A (en) * | 2021-08-16 | 2021-11-30 | 北京超星未来科技有限公司 | Electromagnetic shielding device of electronic equipment and electronic equipment |
| CN113727593B (en) * | 2021-08-16 | 2024-07-16 | 北京超星未来科技有限公司 | Electromagnetic shielding device of electronic equipment and electronic equipment |
| CN118450691A (en) * | 2024-06-04 | 2024-08-06 | 广东智尚防务科技有限公司 | Automobile electromagnetic protection device |
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| Publication number | Publication date |
|---|---|
| CN112423573B (en) | 2022-12-06 |
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