CN104105388A - Electromagnetic shielding system of measuring integration controller - Google Patents
Electromagnetic shielding system of measuring integration controller Download PDFInfo
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- CN104105388A CN104105388A CN201410234340.0A CN201410234340A CN104105388A CN 104105388 A CN104105388 A CN 104105388A CN 201410234340 A CN201410234340 A CN 201410234340A CN 104105388 A CN104105388 A CN 104105388A
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Abstract
The invention discloses an electromagnetic shielding system of a measuring integration controller, and belongs to the technical field of electromagnetic shielding of electronic equipment of aerospace measuring systems. The electromagnetic shielding system comprises a power supply module, a data conversion module, a CAN (Controller Area Network) bus module, a data storage and integration module, a shielding board, gradient slope surface seams, a printed board electromagnetic compatibility design, an internal shielding bus and an electrical continuity design. The electromagnetic shielding system has the advantages that the system can increase reflection loss and transmission loss of a magnetic wave, reduce leakage of an electromagnetic wave, and improve internal and external electromagnetic shielding of a product; the product achieves modularization, universalization and productization; the boundary dimension of the product is reduced; the design cost is lowered; the quality of a signal between boards is improved; radiation formed by a conductor is reduced; an electromagnetic environment of a chip is improved; and signal attenuation and radiation interference are reduced.
Description
Technical field
The present invention relates to a kind of electromagnetic shielding system of measuring general controller, belong to aerospace measurement system electronics electromangnetic spectrum field.
Background technology
Measuring general controller is the nucleus equipment of small-sized aerospace craft measuring system, for measuring system data acquisition and coding, framing work, also has CAN bus monitor, parallel delay memory, slow memory and the converter function sent out of fast meter concurrently.This external pelivimetry general controller is owing to being applied in small-sized aerospace craft model, so the volume of product and size are had to certain requirement, guarantees the miniaturization of product and integrated.This equipment adopts the large capacity miniature chip of high integration, fully reduces equipment volume under the prerequisite that meets system index requirement, and because the operating frequency of interiors of products chip is higher, space is less, is easily subject to external electromagnetic radiated interference and crosstalks.
Traditional measuring system unit was used for the model such as carrier rocket and strategic arms in the past, the space that product is arranged is larger, distance is mutually wider, the volume of unit is not had to special requirement, the internal electronic component negligible amounts of unit, the pooled applications situation of embedded software is more rare, and the main control device such as DSP, FPGA, single-chip microcomputer can be away from electromagnetic interference source, also can have living space and carry out electromagnetic shielding between mutually.
New environment on small-sized aerospace craft makes on bullet layout compacter, instrument on bullet is carried out integrated, reduce number of devices, volume and weight to reach, save the object of installing space on bullet, unit has been proposed to miniaturization, integrated and multifunction designing requirement as measured general controller, and performance index, weight, volume, maintainability and the reliability of product have had higher requirement.Product complete machine is divided into 4 modules, is respectively power module, data transformation module, CAN bus module, data storage and comprehensive module.The integrated level of electronic product and processing speed also improve greatly, and particularly the working frequency of chip in the CAN bus monitor of product, parallel delay memory, the slow memory of fast meter is higher, and space is less, is easily subject to external electromagnetic radiated interference and crosstalks.In addition, due to complicated function and the Integration Design of product, the quantity of internal electronic component is various, various informative, make the electromagnetic environment in general controller very complicated, mutual electromagnetic interference problem between inner electromagnetic interference and product is serious, and electromagnetic Compatibility Design can not meet new designing requirement in the past.
In sum, in the measurement general controller development stage, product is carried out to new conceptual design, to solve the problems such as network is crosstalked, data are made mistakes, electromagnetic noise leaks, therefore need product to carry out proprietary design of Electromagnetic Shielding, by the Electro Magnetic Compatibility level of the method for designing optimizing products such as effective circuit, structure, material, enable to meet model to the multi-functional of product and miniaturization requirement.
Summary of the invention
Technology of the present invention is dealt with problems: the deficiency that overcomes existing product electromangnetic spectrum, a kind of electromagnetic shielding system of measuring general controller is proposed, by the method for effective circuit, structure, material etc., solve the problem of electromagnetic interference, electromagnetic wave leakage and signal cross-talk, improve signal transmission quality ability between the inside and outside electromagnetic shielding of product and plate, reduced the radiation being formed by wire, improve the electromagnetic environment of chip, reduce the plurality of advantages such as signal attenuation and radiated interference.
Technical solution of the present invention: a kind of electromagnetic shielding system of measuring general controller, comprises power module, data transformation module, CAN bus module, data storage and comprehensive module; Power module is being measured the bottom of general controller, and data transformation module, CAN bus module, data storage and comprehensive module are arranged in order from bottom to top above bus plane; Each module is independent mutually, all can externally produce electromagnetic radiation; Between bus plane and data transformation module, set up a shielded partitions, shielded partitions thickness is between 1～3mm, does not carry out perforate in shielded partitions; The input of the digital integrated circuit of data transformation module CAN bus module, data storage and comprehensive module is not unsettled, pull-up resistor or the pull down resistor of input termination 5～20k Ω; Between the VDD-to-VSS of the integrated circuit of data transformation module CAN bus module, data storage and comprehensive module and connect the decoupling capacitor of a 0.01F～0.1F; Between the microcontroller power supply positive and negative busbar of CAN bus module, add filter circuit; The printed board of CAN bus module comprises clock district and data processing circuit, clock district comprises crystal oscillator and single-chip microcomputer, the crystal oscillator in clock district and single-chip microcomputer pin wiring distance are not more than 3mm, make property-line clock district and data processing circuit isolation, shell of crystal oscillator ground connection is also fixed in the printed board of CAN bus module; Widen the power and ground in data transformation module, CAN bus module, data storage and comprehensive module printed board, width is at least more than or equal to 1.5mm; The printed board of data transformation module, CAN bus module, data storage and comprehensive module is used four laminates, and four laminates are followed successively by bus plane, stratum, digital signal layer, analog signal layer; Between power module and data transformation module, data transformation module and CAN bus module, CAN bus module and data storage and comprehensive module, be provided with domatic ladder seam; Between power module and data transformation module, data transformation module and CAN bus module, CAN bus module and data storage and comprehensive module, increase electromagnetic sealing liner and silicone grease conducting resinl coat, electromagnetic sealing liner has 10%～20% compress variation; The external connector of power module, data transformation module, CAN bus module, data storage and comprehensive module uses conductive rubber pad to be assemblied in respectively in power module, data transformation module, CAN bus module, data storage and comprehensive module, and power module, data transformation module, CAN bus module, data storage and comprehensive module outer surface are carried out to conductive anode and the processing of not painting for the part of mounted connector; Between power module, data transformation module, CAN bus module, data storage and comprehensive module, be connected by printing mother daughter board connector with the internal bus of communicating by letter for powering, realize the straight-through of signal.Described printing mother daughter board connector is that model is the RM222-060-000-0256 of Airborn company; Between the VDD-to-VSS of the integrated circuit of described data transformation module CAN bus module, data storage and comprehensive module and the decoupling capacitor connecing be 0.06F.
The present invention compared with prior art tool has the following advantages:
(1) between bus plane of the present invention and data transformation module, set up shielded partitions, make the relatively large power module of the responsive module that is easily disturbed and electromagnetic radiation as far as possible away from, solved the problem of electric power source pair of module printed board electromagnetic interference.
(2) between the microcontroller power supply positive and negative busbar of the present invention due to employing CAN bus module, add filter circuit, decoupling capacitor and the measure of printed board reasonable line arrangement, reduced the interference of power supply noise to single-chip microcomputer.
(3) the present invention has adopted the measure of the domatic seam of ladder, electromagnetic sealing liner, silicone grease conducting resinl coat, conductive rubber pad, has strengthened external electromagnetic noise and has entered the shielding action leaking with internal electromagnetic noise.
(4) the present invention does not use wire serial connection, adopt and print mother daughter board connector as internal bus, has realized effective transmission of power supply, digital signal, analog signal, has reduced the crosstalk phenomenon of signal.
Brief description of the drawings
Figure 1A and Figure 1B are for measuring general controller outline drawing;
Fig. 2 is the electromagnetic shielding system function distribution schematic diagram of measuring general controller;
Fig. 3 is the domatic seam schematic diagram of ladder;
Fig. 4 is decoupling capacitor and power supply noise schematic diagram;
Fig. 5 is for applying shielding measure and electromagnetic radiation magnitude schematic diagram.
Embodiment
Basic ideas of the present invention are: according to the structure of current production and electric circuit characteristic, reasonably relative position and the cable routing between each unit in mapping device, make the relatively large power module of the responsive module that is easily disturbed and electromagnetic radiation as far as possible away from, input is properly separated with output port, can make mutual interference reduction to minimum degree by rational layout, utilize effective circuit design and PCB layout to improve the antijamming capability of circuit, promote robustness, ensure to greatest extent electromagnetic shielding ability.
Below in conjunction with accompanying drawing, the present invention is described in detail, measure the profile of general controller as shown in FIG. 1A and 1B, belong to miniaturized electronics product, product uses Al-alloy metal shell, carry out electrical system connection by multiple connectors, realize product by four journal stirrups and install.As shown in Figure 2, in figure, 1 is power module, and 2 is data transformation module, and 3 is CAN bus module, and 4 is data storage and comprehensive module, the 5th, and shielded partitions, the 6th, product casing, the 7th, the domatic seam of ladder, the 8th, to outconnector, the 9th, internal bus.The electromagnetic shielding system of measuring general controller comprises above four kinds of modules, and wherein power module is being measured the bottom of general controller, and data transformation module, CAN bus module, data storage and comprehensive module are arranged in order from bottom to top above bus plane; Each module is independent mutually, all can externally produce electromagnetic radiation; Between bus plane and data transformation module, set up a shielded partitions, as shown in Figure 2, in figure, 5 is shielded partitions, and shielded partitions thickness is between 1～3mm, does not carry out perforate in shielded partitions; Make the relatively large power module of the responsive module that is easily disturbed and electromagnetic radiation as far as possible away from, thereby realize the effectiveness between built-in system, by the amount of electromagnetic radiation level of data transformation module, CAN bus module, data storage and comprehensive module is tested, effect as shown in Figure 5, in figure, the representative of A post does not adopt any shielding measure to product, the representative of B post increases shielded partitions measure to product, compared with not installing shielded partitions additional, electromagnetic radiation magnitude has occurred approximately having reduced by 20%.
The input of the digital integrated circuit of data transformation module CAN bus module, data storage and comprehensive module is not unsettled, pull-up resistor or the pull down resistor of input termination 5～20k Ω; Between the microcontroller power supply positive and negative busbar of CAN bus module, add filter circuit; The printed board of CAN bus module comprises clock district and data processing circuit, clock district comprises crystal oscillator and single-chip microcomputer, the crystal oscillator in clock district and single-chip microcomputer pin wiring distance are not more than 3mm, make property-line clock district and data processing circuit isolation, shell of crystal oscillator ground connection is also fixed in the printed board of CAN bus module; Widen the power and ground in data transformation module, CAN bus module, data storage and comprehensive module printed board, width is at least more than or equal to 1.5mm; The printed board of data transformation module, CAN bus module, data storage and comprehensive module is used four laminates, and four laminates are followed successively by bus plane, stratum, digital signal layer, analog signal layer; Between the VDD-to-VSS of the integrated circuit of data transformation module CAN bus module, data storage and comprehensive module and connect the decoupling capacitor of a 0.01F～0.1F, the actual electric capacity of selecting 0.06F, this electric capacity choose effect as shown in Figure 4, product adds after decoupling capacitor, and declining appears in power supply noise, when capacitance is during at 0.06uF, power supply noise drops to minimum point substantially, continue to increase electric capacity, power supply noise does not have last transition substantially, therefore selects the electric capacity of 0.06uF.
Between power module and data transformation module, data transformation module and CAN bus module, CAN bus module and data storage and comprehensive module, be provided with domatic ladder seam, power module and data transformation module, data transformation module and CAN bus module, between CAN bus module and data storage and comprehensive module, increase electromagnetic sealing liner and silicone grease conducting resinl coat, as shown in Figure 3, in figure, 201 is structural members of data transformation module, in figure, 301 is structural members of CAN bus module, in figure, 10 is electromagnetic sealing liners, by by concavo-convex structural member processing factory two kinds of versions and splice, thereby realizing product fixes and reduces gap, the electromagnetic sealing liner installing additional has 10%～20% compress variation, realize the electric good conducting of upper and lower two structural members, and realize sealing property, the external connector of power module, data transformation module, CAN bus module, data storage and comprehensive module uses conductive rubber pad to be assemblied in respectively in power module, data transformation module, CAN bus module, data storage and comprehensive module, and power module, data transformation module, CAN bus module, data storage and comprehensive module outer surface are carried out to conductive anode and the processing of not painting for the part of mounted connector, between power module, data transformation module, CAN bus module, data storage and comprehensive module, be connected by printing mother daughter board connector with the internal bus of communicating by letter for powering, realize the straight-through of signal.Use after above-mentioned measure, apply electromagnetic interference in product outside, and detect at interiors of products, result as shown in Figure 5, in figure, the representative of A post does not adopt any shielding measure to product, the representative of B post increases shielded partitions measure to product, the representative of C post has increased the domatic seam of ladder on the basis of B post, the measure of electromagnetic sealing liner and conductive rubber pad, the representative of D post has increased internal bus measure on the basis of C post, can reflect by Fig. 5, along with the increase of shielding measure, there is obvious decline in electromagnetic radiation magnitude, reflect the validity of above measure.The present invention's requirement to CE102, CS106, RS103, ESD, RE102, CS114, CS115, CS116 test by GJB151A-97 smoothly, and participate in repeatedly flight test of small-sized aerospace craft, all working properly, measuring system is the complete omnidistance all telemetries of small-sized aerospace craft flight and the outer data of surveying of GPS forwarding obtained all, accomplish the task satisfactorily, do not go wrong.
The content not being described in detail in specification of the present invention belongs to professional and technical personnel in the field's known technology.Although described by reference to the accompanying drawings embodiments of the present invention, those of ordinary skill in the art can make various distortion or amendment within the scope of the appended claims.
Claims (4)
1. an electromagnetic shielding system of measuring general controller, is characterized in that: comprise power module, data transformation module, CAN bus module, data storage and comprehensive module; Power module is being measured the bottom of general controller, and data transformation module, CAN bus module, data storage and comprehensive module are arranged in order from bottom to top above bus plane; Each module is independent mutually, all can externally produce electromagnetic radiation; Between bus plane and data transformation module, set up a shielded partitions, shielded partitions thickness is between 1～3mm, does not carry out perforate in shielded partitions; The input of the digital integrated circuit of data transformation module CAN bus module, data storage and comprehensive module is not unsettled, pull-up resistor or the pull down resistor of input termination 5～20k Ω; Between the VDD-to-VSS of the integrated circuit of data transformation module CAN bus module, data storage and comprehensive module and connect the decoupling capacitor of a 0.01F～0.1F; Between the microcontroller power supply positive and negative busbar of CAN bus module, add filter circuit; The printed board of CAN bus module comprises clock district and data processing circuit, clock district comprises crystal oscillator and single-chip microcomputer, the crystal oscillator in clock district and single-chip microcomputer pin wiring distance are not more than 3mm, make property-line clock district and data processing circuit isolation, shell of crystal oscillator ground connection is also fixed in the printed board of CAN bus module; Widen the power and ground in data transformation module, CAN bus module, data storage and comprehensive module printed board, width is at least more than or equal to 1.5mm; The printed board of data transformation module, CAN bus module, data storage and comprehensive module is used four laminates, and four laminates are followed successively by bus plane, stratum, digital signal layer, analog signal layer; Between power module and data transformation module, data transformation module and CAN bus module, CAN bus module and data storage and comprehensive module, be provided with domatic ladder seam; Between power module and data transformation module, data transformation module and CAN bus module, CAN bus module and data storage and comprehensive module, increase electromagnetic sealing liner and silicone grease conducting resinl coat, electromagnetic sealing liner has 10%～20% compress variation; The external connector of power module, data transformation module, CAN bus module, data storage and comprehensive module uses conductive rubber pad to be assemblied in respectively in power module, data transformation module, CAN bus module, data storage and comprehensive module, and power module, data transformation module, CAN bus module, data storage and comprehensive module outer surface are carried out to conductive anode and the processing of not painting for the part of mounted connector; Between power module, data transformation module, CAN bus module, data storage and comprehensive module, be connected by printing mother daughter board connector with the internal bus of communicating by letter for powering, realize the straight-through of signal.
2. a kind of electromagnetic shielding system of measuring general controller according to claim 1, is characterized in that: the model of described printing mother daughter board connector is the RM222-060-000-0256 of Airborn company.
3. a kind of electromagnetic shielding system of measuring general controller according to claim 1, is characterized in that: between the VDD-to-VSS of the integrated circuit of described data transformation module CAN bus module, data storage and comprehensive module and the decoupling capacitor connecing be 0.06F.
4. a kind of electromagnetic shielding system of measuring general controller according to claim 1, is characterized in that: described electromagnetic sealing liner uses the trade mark that 0.51mm is thick to process aftershaping as raw material for conductive rubber slab 40-10-1010-1350.
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| 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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| CN201410234340.0A CN104105388B (en) | 2014-05-29 | 2014-05-29 | A kind of electromagnetic shielding system of measurement ICU |
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| CN104105388A true CN104105388A (en) | 2014-10-15 |
| CN104105388B CN104105388B (en) | 2017-03-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110113926A (en) * | 2019-05-30 | 2019-08-09 | 维沃移动通信有限公司 | A kind of shielding construction 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 |
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| CN201654083U (en) * | 2010-05-06 | 2010-11-24 | 中国人民解放军92601部队 | Shielding box for weak-voltage detector |
| US20110299264A1 (en) * | 2010-06-08 | 2011-12-08 | Samsung Electro-Mechanics Co., Ltd. | Emi noise shield board including electromagnetic bandgap structure |
| 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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2014
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Patent Citations (3)
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|---|---|---|---|---|
| CN201654083U (en) * | 2010-05-06 | 2010-11-24 | 中国人民解放军92601部队 | Shielding box for weak-voltage detector |
| US20110299264A1 (en) * | 2010-06-08 | 2011-12-08 | Samsung Electro-Mechanics Co., Ltd. | Emi noise shield board including electromagnetic bandgap structure |
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110113926A (en) * | 2019-05-30 | 2019-08-09 | 维沃移动通信有限公司 | A kind of shielding construction and terminal |
| 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 |
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| CN104105388B (en) | 2017-03-15 |
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