CN201422235Y - Electromagnetic interference resisting structure of printed circuit board - Google Patents
Electromagnetic interference resisting structure of printed circuit board Download PDFInfo
- Publication number
- CN201422235Y CN201422235Y CN2009203012823U CN200920301282U CN201422235Y CN 201422235 Y CN201422235 Y CN 201422235Y CN 2009203012823 U CN2009203012823 U CN 2009203012823U CN 200920301282 U CN200920301282 U CN 200920301282U CN 201422235 Y CN201422235 Y CN 201422235Y
- Authority
- CN
- China
- Prior art keywords
- printed circuit
- circuit board
- electromagnetic interference
- shielding
- protection cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The utility model relates to an electromagnetic interference resisting structure of a printed circuit board, which comprises a printed circuit board, wherein both the front surface and the back surface of the printed circuit board are provided with first shielding protective coverings, elements and wirings on the printed circuit board are covered in the first shielding protective coverings, the thickness of the first shielding protective coverings is 0.4-0.6mm, and the first shielding protective coverings are made from materials with high magnetic inductivity. Radiation sources in and out of acabinet and the elements on the printed circuit board are separated through a single or a plurality of layers of shielding protective coverings which are arranged on the front surface and the back surface of the printed circuit board, which effectively improves electromagnetic interference resistant performance of the printed circuit board, and improves the stability of electric appliance equipment.
Description
Technical field
The utility model belongs to electric equipment and makes the field, relates in particular to the anti-electromagnetic interference structure of a kind of printed circuit board, is applicable to printed circuit board anti-interference of protective relaying device, is used for comprehensive automation of electric power system.
Background technology
Because the difference of domestic each department weather is different to the anti-electromagnetic interference performance requirement of protective relaying device.Nowadays produce protective relaying device producer and stand in great numbers, the processing mode of the anti-electromagnetic interference of protective device is had nothing in common with each other, most of producer all is by the wiring that improves printed circuit board or improves casing structure and realize.In recent years along with development of electronic technology, clock rate on the printed circuit board in microprocessor and the logical circuit is more and more faster, rising/the fall time of signal is shorter and shorter, device density and wiring density on the printed circuit board constantly increases simultaneously, and the electromagnetic compatibility problem of printed circuit board becomes and becomes increasingly conspicuous.The anti-electromagnetic compatibility of printed circuit board will be considered three key elements: 1. guarantee signal reliable transmission onboard, guarantee the integrality of signal; 2. suppress the propagation of electromagnetic interference; 3. strengthen protection, prevent to cause the sensitivity fault because of anti-winding degree deficiency.But PCB routing is limited by the electric property in size, aspect and the variant loop of printed panel, thus the anti-electromagnetic interference performance of printed board can not obtain fully the constraint, can only improve in others and subdue electromagnetic radiation.
The selector box material can weakened at different degrees to the electromagnetic radiation of protective relaying device, relay protection circuit is played shielding action.The largest benefit that solves electromagnetic interference problem with the method for electromagnetic shielding is the operate as normal that can not influence circuit, is not very high to the requirement of circuit.If radiation source is in the outside of shielding case (for example, shielding is the influence of avoiding external interference for the circuit in the cabinet), then reflection loss and absorption loss all have contribution to screening effectiveness, and this situation can realize anti-interference by the improvement of cabinet.If but radiation source at cabinet inside, this situation can't realize anti-interference by the improvement of cabinet.
Summary of the invention
The utility model mainly solves some electric equipment can't be by improving the technical problem that wiring on the wiring board and electric equipment cabinet are realized anti-electromagnetic interference; Provide a kind of printed circuit board anti-electromagnetic interference structure, guarantee the anti-electromagnetic interference of protective relaying device in the electric equipment.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: the utility model comprises printed circuit board, and the obverse and reverse of described printed circuit board all is equipped with the first shielding protection cover.The first shielding protection cover is kept apart components and parts on the printed circuit board and outside radiation source (comprising the radiation source in the cabinet), and the wiring improvement on the combined printed wiring board and the improvement of cabinet make electric equipment reach better anti-electromagnetic interference performance.
As preferably, the described first shielding protection cover adopts high permeability materials.Magnetic field for frequency extremely low (as direct current or 50Hz), when doing shielding with high permeability materials, except absorption loss, its magnetic bypass effect also is crucial: the shield that high permeability materials constitute makes magnetic field walk around Sensitive Apparatus for magnetic field provides the path of a low magnetic resistance.Therefore the magnetic resistance of shield is more little, and screening effectiveness is high more.In order to reduce the magnetic resistance of shield, should make shield as far as possible little, can make magnetic circuit as far as possible short like this, thereby reach the purpose that reduces magnetic resistance, increase the sectional area of magnetic circuit, use the permeability high material of trying one's best.
As preferably, the thickness of the described first shielding protection cover is 0.4～0.6 millimeter.
As preferably, the obverse and reverse of described printed circuit board also is equipped with the secondary shielding protective cover, and the secondary shielding protective cover is positioned at the outside of the first shielding protection cover.
As preferably, the described first shielding protection cover adopts high permeability materials, and described secondary shielding protective cover adopts permeability lower and be not easy saturated material.When the magnetic field that will shield is very strong, there is a pair of contradiction, promptly in order to obtain higher shielding properties, need to use the higher material of permeability, but this material is saturated easily.If with relatively being not easy saturated material, often because magnetostatic conductance m is lower, shielding properties does not reach requirement again.Adopt the double layer screen protective cover to address this problem.Earlier lower with permeability, but be not easy saturated material (being the secondary shielding protective cover) magnetic field intensity is decayed to lower degree, use high permeability materials (i.e. the first shielding protection cover) that enough shieldings are provided then.The screening effectiveness of multilayer screen is than the screening effectiveness height of single-layer shield (even without saturated), because many two-layer reflecting interfaces.
The beneficial effects of the utility model are: by the obverse and reverse at printed circuit board single or multiple lift shielding protection cover is set, radiation source outside radiation source in the cabinet and the cabinet and the components and parts on the printed circuit board are kept apart, effectively improve the anti-electromagnetic interference performance of printed circuit board, improved the stability of electric equipment.
Description of drawings
Fig. 1 is a kind of perspective view of the utility model embodiment 1.
Fig. 2 is a kind of side-looking structural representation of the utility model embodiment 2.
1. printed circuit boards among the figure, the 2. first shielding protection cover, 3. secondary shielding protective cover.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1: the anti-electromagnetic interference structure of the printed circuit board of present embodiment, as shown in Figure 1, comprise printed circuit board 1, the obverse and reverse of printed circuit board 1 all is equipped with the first shielding protection cover 2, the first shielding protection cover 2 covers on its inside with the wiring on the components and parts on the printed circuit board 1, the printed circuit board 1, the thickness of the first shielding protection cover 2 is 0.5 millimeter, and the first shielding protection cover 2 adopts high permeability materials to make.Present embodiment has not only shielded the radiation source in the cabinet but also has shielded the outer radiation source of cabinet, and the printed circuit board of protective relaying device especially needs this shielding construction in order to resist external disturbance, and present embodiment uses when being fit to shield more weak magnetic field.
Embodiment 2: the anti-electromagnetic interference structure of the printed circuit board of present embodiment, as shown in Figure 2, the obverse and reverse of printed circuit board 1 all is equipped with the first shielding protection cover 2, secondary shielding protective cover 3, the first shielding protection cover 2 is with the components and parts on the printed circuit board 1, wiring on the printed circuit board 1 covers on its inside, secondary shielding protective cover 3 is positioned at the outside of the first shielding protection cover 2, the first shielding protection cover 2 is covered on its inside, the first shielding protection cover 2 adopts high permeability materials to make, and secondary shielding protective cover 3 adopts permeabilities lower and be not easy saturated material and make.Remaining is with embodiment 1.Present embodiment uses when being fit to shield stronger magnetic field.Earlier lower but be not easy saturated material (being the secondary shielding protective cover) magnetic field intensity is decayed to lower degree with permeability, use high permeability materials (i.e. the first shielding protection cover) that enough shieldings are provided then.The screening effectiveness of multilayer screen is than the screening effectiveness height of single-layer shield (even without saturated).
Claims (5)
1. the anti-electromagnetic interference structure of printed circuit board comprises printed circuit board (1), it is characterized in that the obverse and reverse of described printed circuit board (1) all is equipped with the first shielding protection cover (2).
2. the anti-electromagnetic interference structure of printed circuit board according to claim 1 is characterized in that the described first shielding protection cover (2) adopts high permeability materials.
3. the anti-electromagnetic interference structure of printed circuit board according to claim 1 and 2, the thickness that it is characterized in that the described first shielding protection cover (2) is 0.4～0.6 millimeter.
4. the anti-electromagnetic interference structure of printed circuit board according to claim 1, the obverse and reverse that it is characterized in that described printed circuit board (1) also is equipped with secondary shielding protective cover (3), and secondary shielding protective cover (3) is positioned at the outside of the first shielding protection cover (2).
5. the anti-electromagnetic interference structure of printed circuit board according to claim 4 is characterized in that the described first shielding protection cover (2) adopts high permeability materials, and described secondary shielding protective cover (3) adopts permeability lower and be not easy saturated material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203012823U CN201422235Y (en) | 2009-03-13 | 2009-03-13 | Electromagnetic interference resisting structure of printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203012823U CN201422235Y (en) | 2009-03-13 | 2009-03-13 | Electromagnetic interference resisting structure of printed circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201422235Y true CN201422235Y (en) | 2010-03-10 |
Family
ID=41808895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203012823U Expired - Fee Related CN201422235Y (en) | 2009-03-13 | 2009-03-13 | Electromagnetic interference resisting structure of printed circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201422235Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103200766A (en) * | 2013-03-04 | 2013-07-10 | 广东生益科技股份有限公司 | Multilayer printed wiring board and manufacturing method thereof |
| CN106714539A (en) * | 2017-01-07 | 2017-05-24 | 深圳市景程信息科技有限公司 | Electromagnetic pulse protection device of regular quadrilateral structure |
| US10729003B2 (en) | 2018-07-05 | 2020-07-28 | Asustek Computer Inc. | Anti-electromagnetic interference circuit board |
-
2009
- 2009-03-13 CN CN2009203012823U patent/CN201422235Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103200766A (en) * | 2013-03-04 | 2013-07-10 | 广东生益科技股份有限公司 | Multilayer printed wiring board and manufacturing method thereof |
| CN103200766B (en) * | 2013-03-04 | 2016-09-07 | 广东生益科技股份有限公司 | A kind of multilayer printed wiring board and preparation method thereof |
| CN106714539A (en) * | 2017-01-07 | 2017-05-24 | 深圳市景程信息科技有限公司 | Electromagnetic pulse protection device of regular quadrilateral structure |
| WO2018126598A1 (en) * | 2017-01-07 | 2018-07-12 | 深圳市景程信息科技有限公司 | Electromagnetic pulse protection device having square structure |
| US10729003B2 (en) | 2018-07-05 | 2020-07-28 | Asustek Computer Inc. | Anti-electromagnetic interference circuit board |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201422235Y (en) | Electromagnetic interference resisting structure of printed circuit board | |
| TW200740331A (en) | Hybrid multilayer circuit board and method of manufacturing the same | |
| JPH07263871A (en) | Printed wiring board | |
| CN201374868Y (en) | Circuit board structure | |
| CN104144598B (en) | Radome and circuit board fixation structure | |
| CN206851258U (en) | A kind of new electronic component shielding box | |
| CN107846834A (en) | Power model | |
| CN102821537A (en) | Printed circuit board with shielding case | |
| CN210609835U (en) | Multilayer radiation-proof PCB | |
| CN204696011U (en) | A kind of electromagnetic armouring structure for keyboard | |
| CN105208844A (en) | Method for shielding high-speed signal interference of PCB (printed circuit board) | |
| US20090213565A1 (en) | Emc shielding for printed circuits using flexible printed circuit materials | |
| CN201267088Y (en) | Novel electromagnetic shielding foil structure | |
| CN209462880U (en) | A kind of protection type electric cabinet | |
| CN107835443A (en) | A kind of set top box | |
| CN201479456U (en) | Electromagnetic wave shielding device | |
| CN2577329Y (en) | Computer casing outlaid board-card multi-purpose shielding apparatus | |
| CN201821635U (en) | Novel magnetic shielding device | |
| CN103052309A (en) | Electromagnetic shielding stripe | |
| CN205681767U (en) | A kind of protection cabinet improving Electro Magnetic Compatibility | |
| CN202503868U (en) | Electromagnetic shielding composite material | |
| CN205946503U (en) | Shield cover with safety protection function | |
| CN201219346Y (en) | Control panel component with electromagnetic interference shielding function and monitoring equipment with the same | |
| CN205071463U (en) | PCB circuit board anti -electromagnetic interference structure | |
| CN212381615U (en) | Insulating electromagnetic shielding film |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100310 Termination date: 20180313 |