CN111740585A - Electromagnetic interference preventing flexible direct current converter valve secondary board card and manufacturing method - Google Patents
Electromagnetic interference preventing flexible direct current converter valve secondary board card and manufacturing method Download PDFInfo
- Publication number
- CN111740585A CN111740585A CN202010502548.1A CN202010502548A CN111740585A CN 111740585 A CN111740585 A CN 111740585A CN 202010502548 A CN202010502548 A CN 202010502548A CN 111740585 A CN111740585 A CN 111740585A
- Authority
- CN
- China
- Prior art keywords
- board card
- shielding
- direct current
- converter valve
- amorphous
- 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.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
-
- 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
- H05K9/0049—Casings being metallic containers
-
- 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
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
A secondary board card of a flexible direct current converter valve for preventing electromagnetic interference and a manufacturing method thereof, and a full-bridge MMC module, wherein the secondary board card comprises an IGBT driving board card, a central control SCE board card and/or a power supply board card, and is vertically placed in a shielding shell designed by permalloy materials, and the size of the shielding shell is designed according to the size of the secondary board card; coating an amorphous shielding material layer with the thickness of about 200-300 mu m on the surface of the permalloy shielding shell for shielding low-frequency electromagnetic waves, wherein the amorphous shielding material layer is prepared by adding amorphous magnetic alloy powder, magnetic fibers and nickel powder into acrylic resin according to a certain proportion; the flexible direct current converter valve MMC full-bridge module is packaged by adopting a metal aluminum shell in an electromagnetic shielding mode, and the same amorphous shielding composite material with the thickness of 200-300 mu m is coated inside the aluminum shell, so that the electromagnetic interference influence of electromagnetic wave radiation of an external MMC module on a high-potential secondary board card is further weakened.
Description
Technical Field
The invention belongs to the technical field of high-voltage flexible direct current power transmission, relates to a measure for preventing electromagnetic interference radiation of secondary equipment of a high-voltage flexible direct current power transmission converter valve, and particularly relates to an electromagnetic interference preventing flexible direct current converter valve secondary board card, a manufacturing method thereof and a full-bridge MMC module.
Background
The ultra-high voltage direct current transmission technology has the advantages of small loss, long-distance large-capacity transmission and the like, and the flexible direct current transmission technology has the advantages of flexibility, controllability, capability of forming multi-terminal networking and the like, and has become the development trend of future direct current transmission. The flexible direct current transmission converter valve is used as core equipment of a converter station, and whether the flexible direct current transmission converter valve can reliably operate directly relates to safe operation of a power grid, so that the reliability of the flexible direct current transmission converter valve is improved, and normal operation of secondary system equipment of the converter valve is required to be ensured.
High-potential secondary board cards such as an IGBT driving board card, a central control SCE board card and a power supply board card directly act on the high-potential flexible straight valve tower to bear the action of a more complex electromagnetic field environment; must can ensure that the high potential secondary integrated circuit board can tolerate strong electromagnetic environment to reliable work under complicated electromagnetic condition, thereby guarantee IGBT normal turn-on and turn-off.
According to the traditional high-potential secondary board card design of the flexible direct current converter valve, due to the lack of corresponding theoretical research, some secondary board cards are directly exposed, no shielding measure is provided or only a simple conductive outer shielding shell is designed, the reliability requirement under the complex electromagnetic environment of 500kV or even higher voltage level cannot be met, and a new shielding scheme is designed, so that the requirement of electric field shielding can be met, and the requirement of electromagnetic shielding can be met.
Disclosure of Invention
The invention aims to provide an electromagnetic interference preventing flexible direct current converter valve secondary board card, a manufacturing method thereof and a full-bridge MMC module.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an electromagnetic interference preventing flexible direct current converter valve secondary board card, which comprises an IGBT driving board card, a central control SCE board card and/or a power supply board card;
the secondary board card is externally coated with a shielding shell, the shielding shell is made of permalloy materials, and the surface of the shielding shell is coated with an amorphous shielding composite material layer with the thickness of 200-300 mu m.
Further, the amorphous shielding composite material layer comprises nickel powder, magnetic fibers, amorphous magnetic powder and acrylic resin, wherein the mass fraction ratio is that the nickel powder: magnetic fiber: amorphous magnetic powder: the acrylic resin is 1:0.5:1: 8-1: 0.7:1: 9.
Further, the permalloy comprises iron-nickel alloy and cobalt-manganese alloy, wherein the mass of the iron-nickel alloy accounts for about 70% -80%, and the mass of the cobalt-manganese alloy accounts for about 20% -30%.
Furthermore, the surface of the shielding shell adopts a porous design to play a role in heat dissipation.
Furthermore, openings are arranged at corresponding positions of the shielding shell to facilitate connection of the power line and the optical fibers.
Further, the secondary plate is fixedly connected with the shielding shell through a screw.
The second aspect of the invention provides a method for manufacturing a secondary board card of an electromagnetic interference resistant flexible direct current converter valve, which comprises the following steps:
selecting nickel powder with the particle size of 1-10 mu m, magnetic fiber and amorphous magnetic powder, wherein the mass fraction ratio of the nickel powder to the magnetic fiber to the amorphous magnetic powder is 1:0.5: 1-1: 0.7:1, and modifying the surface of the nickel powder to obtain modified magnetic particles by using a coupling agent;
uniformly dispersing the magnetic particles by using an ethanol or xylene dispersing agent;
adding an ethyl acetate diluent, mixing and adding into acrylic resin, wherein the mass ratio of ethyl acetate to acrylic resin is about 0.5:1, and obtaining an amorphous shielding composite material mixed solution;
uniformly coating the amorphous shielding composite material on the surface of a shielding shell made of a permalloy material, wherein the coating thickness is 200-300 mu m;
heating the shielding shell coated with the amorphous shielding composite material for curing at 150 ℃ for 10 h;
and fixedly connecting the cured shielding shell to the outside of the secondary board card.
The invention provides an electromagnetic interference preventing flexible direct current converter valve full-bridge MMC module, which comprises the electromagnetic interference preventing flexible direct current converter valve secondary board card.
Furthermore, the MMC module is externally coated with an aluminum shielding shell, and an amorphous shielding material layer with the thickness of 200-300 mu m is coated inside the aluminum shielding shell.
Further, the exterior of the aluminum shielding shell is coated with conductive paint.
In summary, the invention provides an electromagnetic interference resistant flexible dc converter valve secondary board card, a manufacturing method thereof, and a full-bridge MMC module. The secondary board card comprises an IGBT driving board card, a central control SCE board card and/or a power supply board card; the secondary board card is externally coated with a shielding shell, the shielding shell is made of permalloy materials, and the surface of the shielding shell is coated with an amorphous shielding composite material layer with the thickness of 200-300 mu m. The amorphous shielding layer is prepared by adding amorphous magnetic alloy powder, magnetic fiber and nickel powder into acrylic resin according to a certain proportion; the flexible direct current converter valve MMC full-bridge module is packaged by adopting a metal aluminum shell in an electromagnetic shielding mode, and the same amorphous shielding composite material with the thickness of 200-300 mu m is coated inside the aluminum shell, so that the electromagnetic interference influence of electromagnetic wave radiation of an external MMC module on a high-potential secondary board card is further weakened.
The technical scheme of the invention has the following beneficial technical effects:
the operation reliability of the current flexible direct current converter valve is improved, the influence of a high-frequency electromagnetic field generated by an external strong electric field and the switching on and off of an IGBT on the work of a secondary board card is weakened through the design of the electromagnetic interference shielding scheme, the shielding scheme is simple in structure, strong in anti-electromagnetic interference capability and low in cost, and the operation stability of the flexible direct current converter valve can be improved.
Drawings
Fig. 1 is a schematic diagram of a high-potential secondary board card for preventing electromagnetic interference according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of an external aluminum shielding case of a full-bridge MMC module for preventing electromagnetic interference according to an embodiment of the present invention.
Reference numerals: 1. a shielding housing; 2. an amorphous shielding material layer; 3. secondary board clamping; 4. an aluminum shield case; 5. and (3) conductive paint.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1, a first aspect of the present invention provides an electromagnetic interference resistant secondary board card for a flexible dc converter valve, where the secondary board card includes an IGBT driving board card, a central control SCE board card and/or a power board card; the secondary board card is externally coated with a shielding shell 1, the shielding shell is made of permalloy materials, and the surface of the shielding shell is coated with an amorphous shielding composite material layer 2 with the thickness of 200-300 mu m. Different from the traditional aluminum shielding shell scheme, the outer shielding shell made of the permalloy material is adopted at this time, the nickel-based filler ratio is 75%, the permalloy made of the permalloy material is used as a shielding measure of the IGBT high-potential secondary board card, and the electromagnetic interference degree of a high-frequency electromagnetic field generated when the IGBT is switched on and switched off to the high-potential secondary board card during working can be reduced to a great extent. Besides the normal working frequency of the IGBT of the full-bridge MMC module of the flexible direct current converter valve is about several hundred hertz, in order to inhibit the radiation interference of low-frequency electromagnetic waves to a high-potential secondary board card, an amorphous shielding material layer with the thickness of 200-300 mu m is coated on the surface of an outer shielding shell made of permalloy, and the thin layer can reflect and absorb the low-frequency electromagnetic waves.
Further, the amorphous shielding composite material layer comprises nickel powder, magnetic fibers, amorphous magnetic powder and acrylic resin, wherein the mass fraction ratio is that the nickel powder: magnetic fiber: amorphous magnetic powder: the acrylic resin is 1:0.5:1: 8-1: 0.7:1: 9. The preparation of the amorphous shielding composite material thin layer must be strictly executed according to the preparation process, the nickel powder, the magnetic fiber and the amorphous magnetic powder have the particle size of 1-10 mu m, the particle surface is modified, the mass fraction ratio of each filler is strictly carried out according to the formula, and finally, the modified composite material is prepared by pouring the filler into acrylic resin. The prepared amorphous shielding composite material coating particles have uniform dispersibility and no agglomeration phenomenon. The modified composite material is uniformly coated on the surface of a shielding shell and cured at a certain temperature. The surface of the cured shielding shell is shown in figure 1.
Further, the permalloy comprises an iron-nickel composite material and a cobalt-manganese alloy, wherein the mass of the iron-nickel alloy material is 70% -80%, the mass of the cobalt-manganese alloy is 20% -30%, the main component of the permalloy is mainly the iron-nickel composite material, and cobalt-manganese alloy elements are added into the permalloy to enhance the magnetic permeability of the permalloy, so that the permalloy can absorb and reflect electromagnetic waves.
Furthermore, the surface of the shielding shell adopts a porous design to play a role in heat dissipation.
Furthermore, openings are arranged at corresponding positions of the shielding shell to facilitate connection of the power line and the optical fibers.
Furthermore, the secondary plate is fixedly connected with the shielding shell through a screw, so that the secondary plate is ensured to be installed firmly and reliably.
The second aspect of the invention provides a method for manufacturing a secondary board card of an electromagnetic interference resistant flexible direct current converter valve, which comprises the following steps:
selecting nickel powder with the particle size of 1-10 mu m, magnetic fiber and amorphous magnetic powder, wherein the mass fraction ratio of the nickel powder to the magnetic fiber to the amorphous magnetic powder is 1:0.5: 1-1: 0.7:1, and modifying the surfaces of the nickel powder, the magnetic fiber and the amorphous magnetic powder by using a coupling agent. Specifically, the micro powder is firstly put into an oven (200 ℃) to be baked, and the internal water and impurities adsorbed on the surface are evaporated. And (3) naturally cooling in air, adding ethanol for cleaning, washing off residues on the surfaces of the particles, and finally drying in an oven. Putting the treated micro powder into a beaker filled with an acetone solution, and simultaneously adding a coupling agent (3 wt% of micro powder filler) to modify micro powder particles to obtain modified magnetic particles;
uniformly dispersing the magnetic particles by using an ethanol or xylene dispersing agent; specifically, the mass of the dispersing agent is 10 times of that of the micro powder filler;
adding an ethyl acetate diluent, mixing and adding into acrylic resin, wherein the mass ratio of ethyl acetate to acrylic resin is about 0.5:1, and obtaining an amorphous shielding composite material mixed solution;
uniformly coating the amorphous shielding composite material on the surface of a shielding shell made of a permalloy material, wherein the coating thickness is 200-300 mu m;
heating the shielding shell coated with the amorphous shielding composite material for vacuum curing at 150 ℃ for 10 h;
and fixedly connecting the cured shielding shell to the outside of the secondary board card.
Selecting three magnetic conductive fillers of nickel powder, magnetic fiber and amorphous magnetic powder with the particle size of 1-10 mu m, modifying the particle surface in advance, uniformly dispersing the modified three filler particles by adopting a dispersing agent, crosslinking by adopting a coupling agent, pouring into acrylic resin, finally preparing an amorphous shielding composite material, coating the composite material on the surface of a permalloy shielding shell, ensuring the thickness of 200-300 mu m, and realizing uniform coating without bubbles. And placing the shielding shell coated with the amorphous shielding composite material into an oven in a certain temperature environment for curing, so as to ensure that the amorphous shielding composite material layer has good bonding property on the outer layer of the shielding shell and does not fall off after being cured.
A third aspect of the present invention provides an electromagnetic interference prevention flexible dc converter valve full-bridge MMC module, as shown in fig. 2, the full-bridge MMC module includes the electromagnetic interference prevention flexible dc converter valve secondary board card 3 as described above.
Further, the MMC module is externally coated with an aluminum shielding shell 4, and an amorphous shielding material layer 2 with the thickness of 200-300 microns is coated inside the aluminum shielding shell. In addition to the MMC full-bridge module including the IGBT primary device and the IGBT secondary device, an aluminum shielding shell design is adopted, as shown in the attached figure 2. The high-power IGBT module is used for shielding an external high electric field, and meanwhile, a 200-300 mu m thick amorphous shielding composite material thin layer is coated inside an aluminum shielding shell, so that the purpose is to absorb and reflect the electromagnetic radiation degree of an internal IGBT to the outside in the working process, the electromagnetic wave intensity is reduced inside, and the electromagnetic radiation interference degree to an adjacent submodule and other submodules is reduced. The shielding aluminum shell can be coated with good conductive paint for process aesthetics and high electric field insulation protection.
Further, as shown in fig. 2, the exterior of the aluminum shield case is coated with a conductive paint 5. An aluminum shielding shell is adopted at the periphery of the full-bridge MMC module to shield an external high electric field, an amorphous shielding material layer with the thickness of 200-300 mu m is coated inside the aluminum shielding shell, and a layer of conductive paint can be coated outside the aluminum shielding shell to ensure the attractive process and the electric field insulation shielding effect. The amorphous shielding material layer is coated inside the aluminum shielding shell to reduce and weaken the electromagnetic interference of the external module on the single module to the maximum extent.
In summary, the invention provides an electromagnetic interference prevention flexible dc converter valve secondary board card, a manufacturing method thereof, and an electromagnetic interference prevention full-bridge MMC module including the secondary board card. The secondary board card comprises an IGBT driving board card, a central control SCE board card and/or a power supply board card; the secondary board card is externally coated with a shielding shell, the shielding shell is made of permalloy materials, and the surface of the shielding shell is coated with an amorphous shielding composite material layer with the thickness of 200-300 mu m. The amorphous shielding layer is prepared by adding amorphous magnetic alloy powder, magnetic fiber and nickel powder into acrylic resin according to a certain proportion; the flexible direct current converter valve MMC full-bridge module is packaged by adopting a metal aluminum shell in an electromagnetic shielding mode, and the same amorphous shielding composite material with the thickness of 200-300 mu m is coated inside the aluminum shell, so that the electromagnetic interference influence of electromagnetic wave radiation of an external MMC module on a high-potential secondary board card is further weakened.
The technical scheme of the invention can improve the operation reliability of the current flexible direct current converter valve, and the influence of an external strong electric field and a high-frequency electromagnetic field generated by the on-off of the IGBT on the work of the secondary board card is weakened through the design of the electromagnetic interference shielding scheme.
The electromagnetic interference prevention method of the high-potential secondary board card for the flexible-direct converter valve module is particularly suitable for the flexible-direct converter valve under the high-potential condition, is not limited to the application occasion of the flexible-direct converter valve, and can also be used as a secondary board card electromagnetic shielding of a high-voltage direct-current circuit breaker and the like.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. The secondary board card of the electromagnetic interference resistant flexible direct current converter valve is characterized by comprising an IGBT driving board card, a central control SCE board card and/or a power supply board card;
the secondary board card is externally coated with a shielding shell, the shielding shell is made of permalloy materials, and the surface of the shielding shell is coated with an amorphous shielding composite material layer with the thickness of 200-300 mu m.
2. The electromagnetic interference prevention flexible direct current converter valve secondary board card of claim 1, wherein the amorphous shielding composite material layer comprises nickel powder, magnetic fibers, amorphous magnetic powder and acrylic resin, wherein the mass fraction ratio is nickel powder: magnetic fiber: amorphous magnetic powder: the acrylic resin is 1:0.5:1: 8-1: 0.7:1: 9.
3. The electromagnetic interference prevention flexible direct current converter valve secondary board card as claimed in claim 1 or 2, wherein the permalloy comprises an iron-nickel composite material and a cobalt-manganese alloy, wherein the mass fraction of the iron-nickel composite material is 70-80%, and the mass fraction of the cobalt-manganese alloy is 20-30%.
4. The secondary board card for the electromagnetic interference prevention flexible direct current converter valve as claimed in claim 1, wherein a porous design is adopted on the surface of the shielding shell to play a role in heat dissipation.
5. The electromagnetic interference prevention flexible direct current converter valve secondary board card as claimed in claim 1, wherein an opening is provided at a corresponding position of the shielding case to facilitate connection of the power line and the optical fiber.
6. The electromagnetic interference prevention flexible direct current converter valve secondary board card of claim 1, wherein the secondary board is fixedly connected with the shielding shell through a screw.
7. A manufacturing method of an electromagnetic interference resistant secondary board card of a flexible direct current converter valve is characterized by comprising the following steps:
selecting nickel powder with the particle size of 1-10 mu m, magnetic fiber and amorphous magnetic powder, wherein the mass fraction ratio of the nickel powder to the magnetic fiber to the amorphous magnetic powder is 1:0.5: 1-1: 0.7:1, and modifying the surface of the nickel powder to obtain modified magnetic particles by using a coupling agent;
uniformly dispersing the magnetic particles by using an ethanol or xylene dispersing agent;
adding an ethyl acetate diluent, mixing and adding into acrylic resin, wherein the mass ratio of ethyl acetate to acrylic resin is about 0.5:1, and obtaining an amorphous shielding composite material mixed solution;
uniformly coating the amorphous shielding composite material on the surface of a shielding shell made of a permalloy material, wherein the coating thickness is 200-300 mu m;
heating the shielding shell coated with the amorphous shielding composite material for vacuum curing at 150 ℃ for 10 h;
and fixedly connecting the cured shielding shell to the outside of the secondary board card.
8. An electromagnetic interference resistant flexible direct current converter valve full-bridge MMC module, characterized in that, the full-bridge MMC module comprises the electromagnetic interference resistant flexible direct current converter valve secondary board card according to any one of claims 1-6.
9. The electromagnetic interference prevention flexible direct current converter valve full-bridge MMC module of claim 8, wherein, the MMC module is externally wrapped with an aluminum shielding shell, and an amorphous shielding material layer with a thickness of 200 μm to 300 μm is coated inside the aluminum shielding shell.
10. The electromagnetic interference resistance flexible direct current converter valve full bridge MMC module of claim 9, wherein the aluminum shield can is externally coated with a conductive paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010502548.1A CN111740585B (en) | 2020-06-04 | 2020-06-04 | Electromagnetic interference preventing flexible direct current converter valve secondary board card and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010502548.1A CN111740585B (en) | 2020-06-04 | 2020-06-04 | Electromagnetic interference preventing flexible direct current converter valve secondary board card and manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111740585A true CN111740585A (en) | 2020-10-02 |
| CN111740585B CN111740585B (en) | 2021-09-07 |
Family
ID=72650010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010502548.1A Active CN111740585B (en) | 2020-06-04 | 2020-06-04 | Electromagnetic interference preventing flexible direct current converter valve secondary board card and manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111740585B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5561265A (en) * | 1993-03-24 | 1996-10-01 | Northern Telecom Limited | Integrated circuit packaging |
| US6048601A (en) * | 1997-01-20 | 2000-04-11 | Daido Steel Co., Ltd. | Soft magnetic alloy powder for electromagnetic and magnetic shield, and shielding members containing the same |
| CN1412254A (en) * | 2001-10-17 | 2003-04-23 | 四川大学 | Low-frequency electromagnetic wave magnetic shielding composite paint and its preparation method |
| US20100163795A1 (en) * | 2008-12-30 | 2010-07-01 | Cheil Industries Inc. | Resin Composition |
| CN102802395A (en) * | 2012-08-19 | 2012-11-28 | 长沙拓智金属材料科技有限责任公司 | Electromagnetic shielding composite coating resistant to information leakage and radiation pollution |
| CN104064306A (en) * | 2014-07-01 | 2014-09-24 | 张家港市佳晟机械有限公司 | Nickel base flexible magnetic alloy |
| CN205017778U (en) * | 2015-08-18 | 2016-02-03 | 富士康(昆山)电脑接插件有限公司 | Electron device's shield assembly |
| CN105578858A (en) * | 2016-02-29 | 2016-05-11 | 邱炎新 | Anti-electromagnetic interference power module |
| CN105655091A (en) * | 2014-10-23 | 2016-06-08 | 国家电网公司 | Low frequency transformer shielding layer |
| CN105743324A (en) * | 2014-12-11 | 2016-07-06 | 南京南瑞继保电气有限公司 | Board card pluggable flexible DC transmission power module |
| CN107846832A (en) * | 2017-11-16 | 2018-03-27 | 广东欧珀移动通信有限公司 | Shield shell component, terminal device and its assembly method and method for dismounting |
| CN108320896A (en) * | 2018-05-02 | 2018-07-24 | 北京环磁伟业科技有限公司 | A kind of mutual inductor and production method using ultracrystallite punching, permalloy shielding |
-
2020
- 2020-06-04 CN CN202010502548.1A patent/CN111740585B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5561265A (en) * | 1993-03-24 | 1996-10-01 | Northern Telecom Limited | Integrated circuit packaging |
| US6048601A (en) * | 1997-01-20 | 2000-04-11 | Daido Steel Co., Ltd. | Soft magnetic alloy powder for electromagnetic and magnetic shield, and shielding members containing the same |
| CN1412254A (en) * | 2001-10-17 | 2003-04-23 | 四川大学 | Low-frequency electromagnetic wave magnetic shielding composite paint and its preparation method |
| US20100163795A1 (en) * | 2008-12-30 | 2010-07-01 | Cheil Industries Inc. | Resin Composition |
| CN102802395A (en) * | 2012-08-19 | 2012-11-28 | 长沙拓智金属材料科技有限责任公司 | Electromagnetic shielding composite coating resistant to information leakage and radiation pollution |
| CN104064306A (en) * | 2014-07-01 | 2014-09-24 | 张家港市佳晟机械有限公司 | Nickel base flexible magnetic alloy |
| CN105655091A (en) * | 2014-10-23 | 2016-06-08 | 国家电网公司 | Low frequency transformer shielding layer |
| CN105743324A (en) * | 2014-12-11 | 2016-07-06 | 南京南瑞继保电气有限公司 | Board card pluggable flexible DC transmission power module |
| CN205017778U (en) * | 2015-08-18 | 2016-02-03 | 富士康(昆山)电脑接插件有限公司 | Electron device's shield assembly |
| CN105578858A (en) * | 2016-02-29 | 2016-05-11 | 邱炎新 | Anti-electromagnetic interference power module |
| CN107846832A (en) * | 2017-11-16 | 2018-03-27 | 广东欧珀移动通信有限公司 | Shield shell component, terminal device and its assembly method and method for dismounting |
| CN108320896A (en) * | 2018-05-02 | 2018-07-24 | 北京环磁伟业科技有限公司 | A kind of mutual inductor and production method using ultracrystallite punching, permalloy shielding |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111740585B (en) | 2021-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6798904B2 (en) | Power saving device set | |
| CN109605862B (en) | Composite material with heat conduction and electromagnetic shielding functions and preparation method thereof | |
| CN104701273A (en) | Chip packaging structure with electromagnetic shielding function | |
| CN209045285U (en) | A kind of heat-conducting type ring-shaped inductors shell | |
| CN111740585B (en) | Electromagnetic interference preventing flexible direct current converter valve secondary board card and manufacturing method | |
| CN102867647B (en) | A kind of can the direct current support capacitor of effective absorbing high-frequency harmonic wave | |
| CN202009367U (en) | High frequency conduction wave filter | |
| CN212084830U (en) | Transformer device | |
| CN109285681A (en) | High stable high reliability self-loopa three-winding autotransformer and its manufacturing method | |
| CN208806139U (en) | Anti-interference resistant to thermal aging transformer | |
| CN208890376U (en) | A kind of current harmonics suppressor | |
| CN208045270U (en) | A kind of high temperature resistant high power inductors | |
| CN208767102U (en) | A kind of high frequency transformer of high efficiency and heat radiation | |
| CN203761261U (en) | Anti-radiation switching mode power supply | |
| CN214099359U (en) | Sealed inductor of reinforcement installation | |
| CN112103031A (en) | Winding full-encapsulation high-voltage high-frequency transformer applied to power electronic transformer | |
| CN209199743U (en) | A kind of power-supply controller of electric high frequency transformer | |
| CN109887642A (en) | Insulating wrapped agent, integrated inductance preparation method | |
| CN209544123U (en) | A kind of charger transformer | |
| CN218004573U (en) | Transformer with anti-interference function | |
| CN213459295U (en) | Anti-interference three-phase servo transformer | |
| CN208141940U (en) | A kind of easy-to-dismount magnetic core | |
| CN210403423U (en) | Box of totally enclosed water-cooled transformer | |
| CN109411430A (en) | Intelligent power module and preparation method, electric appliance | |
| CN219575376U (en) | Inductance for reducing EMI |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |