CN104105388B - A kind of electromagnetic shielding system of measurement ICU - Google Patents
A kind of electromagnetic shielding system of measurement ICU Download PDFInfo
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- CN104105388B CN104105388B CN201410234340.0A CN201410234340A CN104105388B CN 104105388 B CN104105388 B CN 104105388B CN 201410234340 A CN201410234340 A CN 201410234340A CN 104105388 B CN104105388 B CN 104105388B
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Abstract
A kind of electromagnetic shielding system of measurement ICU, belong to aerospace measurement system electronics electromangnetic spectrum field, including power module, data transformation module, CAN module, data storage and integration module, it is made up of barricade, the domatic seam of ladder, printed board EMC Design, internal shield bus, electrical continuity design.The present invention reduces the leakage rate of electromagnetic wave with increasing magnetic wave reflection loss and loss, improves electromagnetic shielding action inside and outside product；Product realizes modular universal commercialization, reduces product design size, reduces design cost；Signal quality between plate is improved, the radiation formed by wire is reduced, improves many advantages, such as electromagnetic environment of chip, reduction signal attenuation and radiation interference.
Description
Technical field
The present invention relates to a kind of electromagnetic shielding system of measurement ICU, belongs to aerospace measurement system electronics electricity
Shielding techniques field.
Background technology
Measurement ICU is the nucleus equipment of small-sized aerospace craft measuring system, for measuring system data acquisition
With coding, framing work, also have CAN monitor, parallel delay memory, fast meter concurrently and send out memorizer and inverter work(slowly
Energy.This external pelivimetry ICU is due to applying in small-sized aerospace craft model, so the volume and size to product has
There is certain requirement, it is ensured that the miniaturization of product and integrated.The equipment adopts high integration Large Copacity miniature chip, full
Fully reduce equipment volume on the premise of pedal system index request, due to the operating frequency of interiors of products chip higher, space compared with
Little, easily by external electromagnetic radiation interference and crosstalk.
Traditional measuring system unit was used for the models such as carrier rocket and strategic arms in the past, the space of product placement compared with
Greatly, from each other distance is wider, does not have special requirement to the volume of unit, the internal electronic component quantity of unit compared with
Few, the pooled applications situation of embedded software is more rare, and the main control device such as DSP, FPGA, single-chip microcomputer may be located remotely from electricity
Magnetic disturbance source, can also have space to carry out electromagnetic shielding from each other.
New environment on small-sized aerospace craft makes layout on bullet compacter, instrument on bullet is carried out integrated, to reach
Number of devices, volume and weight is reduced, the purpose of installing space on bullet is saved, unit such as measurement ICU is proposed little
Type, integrated and multifunction design requirement, the performance indications of product, weight, volume, maintainability and reliability have more
High requirement.The whole machine of product is divided into 4 modules, and respectively power module, data transformation module, CAN module, data are deposited
Storage and integration module.The integrated level and processing speed of electronic product is also greatly improved, particularly the CAN monitoring of product
Device, parallel delay memory, the slow working frequency of chip that sends out in memorizer of fast meter are higher, and space is less, easily receive external electromagnetic
Radiation interference and crosstalk.Further, since the function of the complexity of product and Integration Design, the quantity of internal electronic component is numerous
Many, various informative so that the electromagnetic environment in ICU is sufficiently complex, mutual between internal electromagnetic interference and product
Electromagnetic interference problem is serious, and conventional electromagnetic Compatibility Design can not meet new design requirement.
In sum, new conceptual design is carried out to product in the measurement ICU development stage, to solve network string
Disturb, the problems such as corrupt data, electromagnetic noise leak, it is therefore desirable to proprietary design of Electromagnetic Shielding is carried out to product, by effective
Circuit, structure, the method for designing such as material optimize the Electro Magnetic Compatibility level of product, enable to meet model to many of product
Function and small form factor requirements.
Content of the invention
The technology solve problem of the present invention：Overcome the shortcomings of existing product electromangnetic spectrum, propose a kind of measurement comprehensive
The electromagnetic shielding system of controller, by the method for effective circuit, structure, material etc., solves electromagnetic interference, electromagnetism
Ripple reveal and signal cross-talk problem, improve signal transmission quality ability between the inside and outside electromagnetic shielding of product and plate, reduce by leading
The radiation that line is formed, improves many advantages, such as electromagnetic environment of chip, reduction signal attenuation and radiation interference.
The technical solution of the present invention：A kind of electromagnetic shielding system of measurement ICU, including power module, number
According to conversion module, CAN module, data storage and integration module；Power module is in the bottom of measurement ICU, data
Conversion module, CAN module, data storage and integration module are arranged in order above bus plane from bottom to top；Each module
Independent mutually, can externally produce electromagnetic radiation；Set up one piece of shielded partitions between bus plane and data transformation module, shield every
Plate thickness is between 1～3mm, does not carry out perforate in shielded partitions；Data transformation module CAN module, data storage and comprehensive
The input of the digital integrated electronic circuit of matched moulds block is not hanging, the pull-up resistor or pull down resistor of input termination 5～20k Ω；Data
Between the power supply and ground of the integrated circuit of conversion module CAN module, data storage and integration module and connect a 0.01F～
The decoupling capacitor of 0.1F；Add filter circuit between the microcontroller power supply positive and negative busbar of CAN module；The print of CAN module
Making sheet includes that clock area and data processing circuit, clock area include crystal oscillator and single-chip microcomputer, the crystal oscillator in clock area and single-chip microcomputer pin
Wiring distance is not more than 3mm, is isolated with data processing circuit using ground bundle of lines clock area, and shell of crystal oscillator is grounded and is fixed on CAN
In bus module printed board；The electricity that widens in data transformation module, CAN module, data storage and integration module printed board
Source line and ground wire, width is at least above equal to 1.5mm；Data transformation module, CAN module, data storage and integration module
Printed board use four laminates, four laminates are followed successively by bus plane, stratum, digital signal layer, analogue signal layer；Power module and number
According to being all provided between conversion module, data transformation module and CAN module, CAN module and data storage and integration module
It is equipped with domatic ladder seam；Power module and data transformation module, data transformation module and CAN module, CAN module with
Increase electromagnetic sealing liner and silicone grease conductive glue layer between data storage and integration module, electromagnetic sealing liner has 10%
～20% compress variation；Power module, data transformation module, CAN module, data storage and integration module external
Adapter is respectively assembled at power module, data transformation module, CAN module, data storage and comprehensive using conductive rubber pad
On matched moulds block, and power module, data transformation module, CAN module, data storage and integration module outer surface are used for pacifying
The part of add-in connectors carries out conductive anodeization and process of not painting；Power module, data transformation module, CAN module, number
According to the internal bus of power supply and communication is used between storage and integration module by printing mother daughter board connector connection, signal is realized
Straight-through.Described prints RM222-060-000-0256 of the mother daughter board connector for model Airborn company；Described data become
Mold changing block CAN module, between the power supply of the integrated circuit of data storage and integration module and ground and the decoupling capacitor that connects is
0.06F.
The present invention is had the advantage that compared with prior art：
(1) shielded partitions are set up between bus plane of the present invention and data transformation module, make the sensitive blocks that are easily disturbed with
The relatively large power module of electromagnetic radiation is far as possible from solving the problems, such as electric power source pair of module printed board electromagnetic interference.
(2) present invention is due to adding filter circuit, decoupling electricity between the microcontroller power supply positive and negative busbar using CAN module
Hold and printed board reasonable line arrangement measure, reduce interference of the power supply noise to single-chip microcomputer.
(3) the domatic seam of ladder, electromagnetic sealing liner, silicone grease conductive glue layer, conductive rubber pad present invention employs
Measure, enhances the shielding action that external electromagnetic noise is entered and internal electromagnetic noise leaks.
(4) present invention does not use wire to concatenate, using printing mother daughter board connector as internal bus, it is achieved that power supply, number
Word signal, effective transmission of analogue signal, reduce the crosstalk phenomenon of signal.
Description of the drawings
Figure 1A and Figure 1B is measurement ICU outline drawing；
Fig. 2 is the electromagnetic shielding system function distribution schematic diagram for measuring ICU；
Fig. 3 is the domatic seam schematic diagram of ladder；
Fig. 4 is decoupling capacitor and power supply noise schematic diagram；
Fig. 5 is applying shielding measure and electromagnetic radiation magnitude schematic diagram.
Specific embodiment
The present invention basic ideas be：According to structure and the electric circuit characteristic of current production, reasonably each list in mapping device
Relative position and cable routing between unit, makes the sensitive blocks being easily disturbed with the relatively large power module of electromagnetic radiation to the greatest extent
Possibly remote from input is properly separated with output port, can be made to interfere by rational layout and is reduced to minimum degree, is utilized
Effectively circuit design and PCB layout improve the capacity of resisting disturbance of circuit, lift vigorousness, ensure electromagnetism to greatest extent
Screening ability.
The present invention is described in detail below in conjunction with the accompanying drawings, measures profile such as Figure 1A and Figure 1B institutes of ICU
Show, belong to miniaturized electronics product, product carries out electrical system company using Al-alloy metal shell by multiple adapters
Connect, realize that product is installed by four journal stirrups.As shown in Fig. 2 in figure 1 be power module, 2 is data transformation module, and 3 is CAN
Bus module, 4 is data storage and integration module, and 5 is shielded partitions, and 6 is product casing, and 7 is the domatic seam of ladder, and 8 is external
Adapter, 9 is internal bus.A kind of electromagnetic shielding system of measurement ICU includes above four kinds of modules, wherein power supply
, in the bottom of measurement ICU, data transformation module, CAN module, data storage and integration module are in power supply for module
Layer top is arranged in order from bottom to top；Each module is independent mutually, can externally produce electromagnetic radiation；Bus plane is converted with data
Set up one piece of shielded partitions between module, as shown in Fig. 2 in figure 5 be shielded partitions, shielded partitions thickness be 1～3mm between,
Perforate is not carried out in shielded partitions；Make the sensitive blocks being easily disturbed with the relatively large power module of electromagnetic radiation as far as possible
From so as to realize the effectiveness between built-in system, by depositing to data transformation module, CAN bus modules, data
The amount of electromagnetic radiation level of storage and integration module is tested, and effect is as shown in figure 5, A posts are represented not to product using any in figure
Shielding measure, B posts are represented increases shielded partitions measure to product, and compared with shielded partitions are not installed additional, electromagnetic radiation magnitude occurs
20% is about reduced.
The input of the digital integrated electronic circuit of data transformation module CAN module, data storage and integration module does not hang
Sky, the pull-up resistor or pull down resistor of input termination 5～20k Ω；Add between the microcontroller power supply positive and negative busbar of CAN module
Filter circuit；The printed board of CAN module includes that clock area and data processing circuit, clock area include crystal oscillator and single-chip microcomputer,
The crystal oscillator in clock area is not more than 3mm with single-chip microcomputer pin wiring distance, is isolated with data processing circuit using ground bundle of lines clock area,
Shell of crystal oscillator is grounded and is fixed in CAN module printed board；Widen data transformation module, CAN module, data storage
And the power and ground in integration module printed board, width is at least above equal to 1.5mm；Data transformation module, CAN mould
The printed board of block, data storage and integration module uses four laminates, four laminates to be followed successively by bus plane, stratum, digital signal layer, mould
Intend signals layer；Between the power supply and ground of the integrated circuit of data transformation module CAN module, data storage and integration module simultaneously
The decoupling capacitor of a 0.01F～0.1F is connect, reality selects the electric capacity of 0.06F, and the selection effect of the electric capacity is as shown in figure 4, produce
After product add decoupling capacitor, declining occurs in power supply noise, and when capacitance is in 0.06uF, power supply noise is bottomed out substantially,
Continue increase electric capacity, power supply noise without last transition, therefore selects the electric capacity of 0.06uF substantially.
Power module is deposited with data transformation module, data transformation module and CAN module, CAN module and data
Domatic ladder seam is provided between storage and integration module；Power module is total with data transformation module, data transformation module and CAN
Increase electromagnetic sealing liner and silicone grease conductive glue layer between wire module, CAN module and data storage and integration module,
As shown in figure 3, in figure 201 be data transformation module structural member, in figure, 301 is the structural member of CAN module, and in figure, 10 are
Electromagnetic sealing liner, by by concavo-convex for structural member processing factory two kinds of version and being spliced, so that realize that product is fixed simultaneously
Reduce gap, the electromagnetic sealing liner for installing additional has 10%～20% compress variation, it is achieved that upper and lower two structural members
Electrically good conducting, and achieve sealing property；Power module, data transformation module, CAN module, data storage and comprehensive
The external connector of matched moulds block using conductive rubber pad be respectively assembled at power module, data transformation module, CAN module,
In data storage and integration module, and to power module, data transformation module, CAN module, data storage and integration module
Outer surface is used for the part of installs connector carries out conductive anodeization and process of not painting；Power module, data transformation module,
CAN module, the internal bus for being used for powering and communicating between data storage and integration module pass through to print mother daughter board connector
Connection, realizes the straight-through of signal.After using above-mentioned measure, apply electromagnetic interference outside product, and enter in interiors of products
Row detection, as a result as shown in figure 5, A posts are represented to product using any shielding measure in figure, B posts are represented increases screen to product
Dividing plate measure is covered, and C posts represent and arranging for the domatic seam of ladder, electromagnetic sealing liner and conductive rubber pad is increased on the basis of B posts
Apply, D posts are represented and increased internal bus measure on the basis of C posts, can be reflected by Fig. 5, with the increasing of shielding measure
Plus, electromagnetic radiation magnitude occurs in that significantly decline, reflects the effectiveness of above measure.The present invention passes through GJB151A-
The requirement of 97 pairs of CE102, CS106, RS103, ESD, RE102, CS114, CS115, CS116 tests, and it is winged to participate in small-sized space flight
The multiple flight test of row device, working properly, measuring system completely obtains all of small-sized aerospace craft flight whole process
Telemetry and GPS forward unit discharging, accomplish the task satisfactorily, do not go wrong.
The content not being described in detail in description of the invention belongs to the known technology of professional and technical personnel in the field.Although knot
Description of Drawings embodiments of the present invention are closed, but those of ordinary skill in the art can be within the scope of the appended claims
Make various modifications or modification.
Claims (4)
1. a kind of measurement ICU electromagnetic shielding system, it is characterised in that：Including power module, data transformation module,
CAN module, data storage and integration module；Power module measurement ICU bottom, data transformation module,
CAN module, data storage and integration module are arranged in order above bus plane from bottom to top；Each module is independent mutually,
Electromagnetic radiation externally can be produced；One piece of shielded partitions is set up between bus plane and data transformation module, and shielded partitions thickness is 1
Between～3mm, perforate in shielded partitions, is not carried out；Data transformation module, CAN module, data storage and integration module
The input of digital integrated electronic circuit is not hanging, the pull-up resistor or pull down resistor of input termination 5～20k Ω；Data transformation module
Between the power supply and ground of the integrated circuit of CAN module, data storage and integration module and connect going for a 0.01F～0.1F
Coupling electric capacity；Add filter circuit between the microcontroller power supply positive and negative busbar of CAN module；The printed board of CAN module includes
Clock area and data processing circuit, clock area include crystal oscillator and single-chip microcomputer, the crystal oscillator in clock area and single-chip microcomputer pin wiring distance
No more than 3mm, is isolated with data processing circuit using ground bundle of lines clock area, and shell of crystal oscillator is grounded and is fixed on CAN module
In printed board；The power line that widens in data transformation module, CAN module, data storage and integration module printed board and ground
Line, width are more than or equal to 1.5mm；The printed board of data transformation module, CAN module, data storage and integration module is used
Four laminates, four laminates are followed successively by bus plane, stratum, digital signal layer, analogue signal layer；Power module and data transformation module,
Domatic ladder is provided between data transformation module and CAN module, CAN module and data storage and integration module
Seam；Power module and data transformation module, data transformation module and CAN module, CAN module and data storage and comprehensive
Increase electromagnetic sealing liner and silicone grease conductive glue layer between matched moulds block, electromagnetic sealing liner has 10%～20% compression
Deflection；The external connector of power module, data transformation module, CAN module, data storage and integration module is using leading
Electric rubber blanket is respectively assembled on power module, data transformation module, CAN module, data storage and integration module, and right
Power module, data transformation module, CAN module, data storage and integration module outer surface are used for the portion of installs connector
Dividing carries out conductive anodeization and process of not painting；Power module, data transformation module, CAN module, data storage and synthesis
It is used for the internal bus of power supply and communication between module by printing mother daughter board connector connection, realizes the straight-through of signal.
2. according to claim 1 a kind of measurement ICU electromagnetic shielding system, it is characterised in that：Described print
The RM222-060-000-0256 of the model Airborn company of mother daughter board connector processed.
3. according to claim 1 a kind of measurement ICU electromagnetic shielding system, it is characterised in that：Described number
According between the power supply and ground of the integrated circuit of conversion module CAN module, data storage and integration module and connect decoupling electricity
Appearance is 0.06F.
4. according to claim 1 a kind of measurement ICU electromagnetic shielding system, it is characterised in that：Described electricity
The trade mark that magnetic seal liner uses 0.51mm thick is that conductive rubber slab 40-10-1010-1350 processes aftershaping as raw material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410234340.0A CN104105388B (en) | 2014-05-29 | 2014-05-29 | A kind of electromagnetic shielding system of measurement ICU |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410234340.0A CN104105388B (en) | 2014-05-29 | 2014-05-29 | A kind of electromagnetic shielding system of measurement ICU |
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| CN104105388A CN104105388A (en) | 2014-10-15 |
| CN104105388B true CN104105388B (en) | 2017-03-15 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110113926B (en) * | 2019-05-30 | 2021-01-08 | 维沃移动通信有限公司 | Shielding structure and terminal |
| CN110794428A (en) * | 2019-12-18 | 2020-02-14 | 中国人民解放军战略支援部队信息工程大学 | Equivalent substitution test system and method for ESD electromagnetic effect of unmanned aerial vehicle GPS module |
| CN111157028A (en) * | 2020-01-10 | 2020-05-15 | 北京时代精衡航天科技有限公司 | Drawer-type structure-based multi-signal acquisition and coding recorder |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201654083U (en) * | 2010-05-06 | 2010-11-24 | 中国人民解放军92601部队 | Shielding box for weak-voltage detector |
| CN103648250A (en) * | 2013-11-28 | 2014-03-19 | 陕西千山航空电子有限责任公司 | Flight parameter collector case wiring method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110134200A (en) * | 2010-06-08 | 2011-12-14 | 삼성전기주식회사 | Emi noise shield board including electromagnetic bandgap structure |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201654083U (en) * | 2010-05-06 | 2010-11-24 | 中国人民解放军92601部队 | Shielding box for weak-voltage detector |
| CN103648250A (en) * | 2013-11-28 | 2014-03-19 | 陕西千山航空电子有限责任公司 | Flight parameter collector case wiring method |
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