CN204956942U - Machine carries data collection station with lightning protection function - Google Patents
Machine carries data collection station with lightning protection function Download PDFInfo
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- CN204956942U CN204956942U CN201520522267.7U CN201520522267U CN204956942U CN 204956942 U CN204956942 U CN 204956942U CN 201520522267 U CN201520522267 U CN 201520522267U CN 204956942 U CN204956942 U CN 204956942U
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Abstract
The utility model discloses a machine carries data collection station with lightning protection function, by quick -witted case (7), apron (9), mother board (10), power module (1), switching value and frequency signal interface module (2), analog signal interface module (3), bus signal interface module (4), host computer module (5), filtering box (6), battery case (8) are constituteed. The utility model discloses a machine carries data collection station, from the produced different influences of thunder and lightning indirect effect, to every kind of influence design that may produce, improves stability and reliability that the machine carried data collection station for the product can normally be worked under the condition of thunder and lightning weather steadily.
Description
Technical field
The utility model belongs to avionics field, is specifically related to a kind of airborne data collector with lightning protection function.
Background technology
Airborne data collector is used for gathering discrete signal, analog signals and the various bus signals on aircraft, issue protection logger after the signal collected is arranged packing, protection logger recorded data is used for aircraft accident analysis, daily attention and Training valuation.
During aircraft flight; often having thunderbolt to occur, thunder and lightning indirect effect can produce induced voltage to equipment cabinets and cableport, especially cable and lead-in wire port danger maximum; the electronic devices and components of airborne data collector can be burnt, make airborne data collector cisco unity malfunction.The requirement of office of CAAC, seaworthiness airborne equipment need meet the test requirements document of RTCADO-160F the 22nd chapter " lightning induction transient state sensivity ".
At present, the airborne data collector that China produces is used for military aircraft, does not also meet the airborne data collector of the civilian requirement of RTCADO-160F the 22nd chapter.
Utility model content
The purpose of this utility model is to provide a kind of lightning protection data trap meeting RTCADO-160F the 22nd chapter test requirements document; solve thunder and lightning indirect effect to the impact of airborne data collector; by to cabinet; the lightning Protection Design of interface module circuit etc., makes product be effectively protected when meeting with thunder and lightning weather.
Consider the problems referred to above of prior art, an aspect disclosed in the utility model, the utility model by the following technical solutions:
A kind of airborne data collector with lightning protection function, by cabinet (7), cover plate (9), motherboard (10), power module (1), switching value and frequency signal interface module (2), analog signal interface module (3), bus signals interface module (4), main computer module (5), filtering box (6), battery case (8) composition;
Built-in electrical insulation resistance is set at cabinet (7), makes cabinet inside circuit and casing insulation, stop lightning induction electric current by cabinet inside circuit; Bonding resistance is set at cabinet (7) simultaneously, cover plate (9) contact surface and cabinet (7) bottom are installed contact surface and are adopted electric conductive oxidation process, data trap is made to form partial equivalent potential, reduce thunder and lightning to the impact of equipment, cabinet (7) adopts sealed cabinet, shielding measure is taked for electromagnetic susceptibility region, connect up in cabinet (7), walking long wiring and sensitive signal wire is other increases ground wire or ground level, filtering process is being carried out for the wire passing in and out cabinet (7); Cabinet (7), by design ground system, prevents accumulation of static electricity;
Aircraft power source is converted to the voltage needed for each interface module (2,3,4) by power module (1), and power module (1) accesses Transient Suppression Diode, high voltage transient suppression;
Switching value, analog quantity, frequency quantity and bus signals that each interface module (2,3,4) collection is inputted by front end pin interfaces; at each interface module (2,3,4) Front-end Design lightning protection circuit, protect back-end circuit not by the impact of lightning effects.
Described lightning protection circuit comprises switching value circuit, analog quantity circuit, frequency signal, bus signals and power supply signal circuit;
Switching value and frequency signal interface module (2) carry out the collection of switching value, switching value circuit gathers multi-path signal, every road signal is connected in series 150K Ω resistance and zener diode, when being subject to lightning induced voltage and impacting, zener diode is in conducting state, lightning induced voltage is by 150K Ω resistance and zener diode, and the transient state induced voltage to back-end circuit has been down to millivolt level;
Analog signal interface module (3) carries out the collection of analog quantity, analog quantity circuit gathers multi-path signal, every road signal is connected in series 300K Ω resistance, when being subject to lightning induced voltage and impacting, lightning induced voltage is less than by the electric current after 300K Ω resistance the maximum current that in back-end circuit, analog switch can bear;
Switching value and frequency signal interface module (2) also carry out the collection of frequency signal; power module (1) gathers power supply signal; bus signals interface module (4) data acquisition bus signal; the frequency signal gathered, power supply signal and bus signals; access Transient Suppression Diode realizes lightning protection; when data trap normally works; Transient Suppression Diode does not work; be equivalent to open circuit; when high-voltage pulse arrives; Transient Suppression Diode by self short circuit, absorbs instantaneous large-current with high speed, and protection back-end circuit does not affect by big current.
Feature of the present utility model is the Different Effects produced from thunder and lightning indirect effect, design for often kind of impact that may produce, improve stability and the reliability of airborne data collector, product can be worked when thunder and lightning weather normal table.
Beneficial effect: the utility model, from actual demand, designs a kind of airborne data collector with lightning protection function, principle is simple, and reliability is high, can meet the thunder-lightning requirement of office of CAAC to airborne equipment collector, have larger practical value.
Accompanying drawing explanation
Fig. 1 airborne data collector constructional drawing;
Fig. 2 switching value schematic circuit diagram;
Fig. 3 analog quantity schematic circuit diagram;
Fig. 4 bus signals schematic circuit diagram.
Detailed description of the invention
Below in conjunction with embodiment, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
See accompanying drawing 1, a kind of airborne data collector with lightning protection function, by cabinet (7), cover plate (9), motherboard (10), power module (1), switching value and frequency signal interface module (2), analog signal interface module (3), bus signals interface module (4), main computer module (5), battery case (8) composition.
Increase built-in electrical insulation resistance at cabinet (7), make cabinet inside circuit and casing insulation, stop lightning induction electric current by cabinet inside circuit; Reduce the bonding resistance of cabinet (7) simultaneously, cover plate (9) contact surface and cabinet (7) bottom are installed contact surface and are adopted electric conductive oxidation process, data trap is made to form partial equivalent potential, reduce thunder and lightning to the impact of equipment, cabinet (7) adopts sealed cabinet, shielding measure is taked for electromagnetic susceptibility region, in cabinet (7), wiring is as far as possible short, increase ground wire or ground level the longer and sensitive signal wire of cabling is other, the wire for turnover cabinet (7) carries out filtering process; Cabinet (7), by design ground system, prevents accumulation of static electricity;
Aircraft power source is converted to the voltage needed for each interface module (2,3,4) by power module (1), and power module (1) accesses Transient Suppression Diode, high voltage transient suppression;
Switching value, analog quantity, frequency quantity and bus signals that each interface module (2,3,4) collection is inputted by front end pin interfaces; at each interface module (2,3,4) Front-end Design lightning protection circuit, protect back-end circuit not by the impact of lightning effects.
The utility model designs as follows for thunder and lightning, high radiation field, electrostatic:
1, lightning protection design
Data trap is installed on interior of aircraft, and when occurring when being struck by lightning, thunder and lightning indirect effect can produce induced voltage to apparatus casing and cableport, especially cable and lead-in wire port danger maximum, can electronic devices and components be burnt, electronic machine can not be worked.Therefore following design is adopted to suppress thunder and lightning indirect effect:
1) external interface design anti-surge circuit.In order to prevent sealing in lightning induction current flow from apparatus interface, selecting anti-lightning strike interface chip, and selecting corresponding matched resistance; Device of surge protector selected by power circuit, can suppress the inducing current on power lead;
2) cabinet inside insulation resistance is increased.Cabinet inside circuit and casing insulate, and cut off ground loop, stop lightning induction electric current by cabinet inside circuit;
3) the bonding resistance of cabinet is reduced.Cabinet adopts integral sealing cabinet, and cover plate contact surface and bottom are installed contact surface and adopted electric conductive oxidation process, can make product formation partial equivalent potential, reduces thunder and lightning to the impact of equipment;
4) adopt J5993 series connector, adaptor union adopt conductive gasket to form 360 degree of ground connection with cabinet.Connector surface has conductive oxide layer, can form complete shielding loop after docking with plug, prevents induction field to the interference of circuit.
2, high radiation field protection Design
Under high high radiation field environment, outside electromagnetic interference may cause electronic machine to lose efficacy, and prevents the means of electromagnetic interference from mainly containing shielding and filtering two kinds of means, adopts following design to make equipment adapt to high high radiation field:
1) adopt sealed cabinet, suitably increase cabinet thickness in internal electrical magnetic susceptibility region;
2) shielding measure is taked for electromagnetic susceptibility region, as increased protective cover;
3) in cabinet, wiring is short as far as possible, and differential signal selects twisted-pair feeder, and sensitive signal selects shielding wire;
4) note when PCB cabling, increase ground wire or ground level the longer and sensitive signal wire of cabling is other;
5) wire for turnover cabinet carries out filtering process, as serial connection serial core filter.
3, Electrostatic Protection Design
Electrostatic discharge can produce very large discharge current, thus destroys the components and parts of electronic machine, even components and parts can be punctured time serious.Adopt the anti-static ability of following design raising equipment:
1) design ground system, prevent accumulation of static electricity.The power supply ground of cabinet inside circuit, digitally, to be in analog connected by magnetic bead, and to be connected with power ground by adaptor union;
2) for the bus signals that may produce electrostatic, the interface chip that resistance to ESD value is high is selected, intensifier circuit antistatic property;
3) the installation contact surface of cabinet adopts electric conductive oxidation process, adopts overlap joint line ground connection, makes cabinet good earth, prevent accumulation of static electricity.
Physical circuit designs:
Switching value schematic circuit diagram are shown in Fig. 2, every road signal have all been connected in series 150K Ω resistance, and have connect stabilivolt.When being subject to lightning induced voltage and impacting, zener diode is in conducting state, lightning induced voltage forms loop by 150K Ω resistance and zener diode to ground, now lightning induced voltage is only remaining less than 600V/150K Ω=4mA by 150K resistance after-current, transient state induced voltage to subsequent conditioning circuit has been down to millivolt level, has affected little.
Analog quantity schematic circuit diagram are shown in Fig. 3, every road signal have all been connected in series 300K Ω resistance.When being subject to lightning induced voltage and impacting, lightning induced voltage is only remaining less than 600V/300K Ω=2mA by 300K Ω resistance after-current, is less than continuous 20mA that analog switch ADG506A can bear and shoves impact; Continuous 20mA as born according to analog switch ADG506A shoves shock calculation, 200K Ω resistance can produce the pressure drop of 200K Ω * 20mA=4000V, much larger than 600V lightning induced voltage, namely lightning induced voltage after 200K Ω resistance on subsequent conditioning circuit substantially without impact; Simultaneously ADG506A device has and bears 4000V electrostatic impact protective capacities, therefore analog signal interface can not need Transient Suppression Diode to absorb moment large voltage.
See Fig. 4, frequency signal, bus signals and power supply signal realize lightning protection by access Transient Suppression Diode.When equipment normally works, Transient Suppression Diode does not work, and is equivalent to open circuit, and when high-voltage pulse arrives, it by self short circuit, absorbs instantaneous large-current with high speed (being less than 1ns), and protection circuit does not below affect by big current.The Transient Suppression Diode of SMBJ6.5CA, SMBJ10CA, 30KPA42CA three types can be selected in the product can to meet lightning protection demand.
Select SMBJ6.5CA Transient Suppression Diode to be attempted by circuit, when normally working, diode is equivalent to open circuit, when carrying out damage tolerance test, effectively can absorb the surge current of 134A.
Select SMBJ10CA Transient Suppression Diode to be attempted by circuit, when normally working, diode is equivalent to open circuit, when carrying out damage tolerance test, effectively can absorb the surge current of 88.3A.
Select 30KPA42CA Transient Suppression Diode to be attempted by circuit, when normally working, diode is equivalent to open circuit, when carrying out damage tolerance test, effectively can absorb the surge current of 420A.
Claims (1)
1. one kind has the airborne data collector of lightning protection function, by cabinet (7), cover plate (9), motherboard (10), power module (1), switching value and frequency signal interface module (2), analog signal interface module (3), bus signals interface module (4), main computer module (5), filtering box (6), battery case (8) composition;
Built-in electrical insulation resistance is set at cabinet (7), makes cabinet inside circuit and casing insulation, stop lightning induction electric current by cabinet inside circuit; Bonding resistance is set at cabinet (7) simultaneously, cover plate (9) contact surface and cabinet (7) bottom are installed contact surface and are adopted electric conductive oxidation process, data trap is made to form partial equivalent potential, reduce thunder and lightning to the impact of equipment, cabinet (7) adopts sealed cabinet, shielding measure is taked for electromagnetic susceptibility region, connect up in cabinet (7), walking long wiring and sensitive signal wire is other increases ground wire or ground level, filtering process is being carried out for the wire passing in and out cabinet (7); Cabinet (7), by design ground system, prevents accumulation of static electricity;
Aircraft power source is converted to the voltage needed for each interface module (2,3,4) by power module (1), and power module (1) accesses Transient Suppression Diode, high voltage transient suppression;
Switching value, analog quantity, frequency quantity and bus signals that each interface module (2,3,4) collection is inputted by front end pin interfaces, at each interface module (2,3,4) Front-end Design lightning protection circuit, protect back-end circuit not by the impact of lightning effects;
Described lightning protection circuit comprises switching value circuit, analog quantity circuit, frequency signal, bus signals and power supply signal circuit;
Switching value and frequency signal interface module (2) carry out the collection of switching value, switching value circuit gathers multi-path signal, every road signal is connected in series 150K Ω resistance and zener diode, when being subject to lightning induced voltage and impacting, zener diode is in conducting state, lightning induced voltage is by 150K Ω resistance and zener diode, and the transient state induced voltage to back-end circuit has been down to millivolt level;
Analog signal interface module (3) carries out the collection of analog quantity, analog quantity circuit gathers multi-path signal, every road signal is connected in series 300K Ω resistance, when being subject to lightning induced voltage and impacting, lightning induced voltage is less than by the electric current after 300K Ω resistance the maximum current that in back-end circuit, analog switch can bear;
Switching value and frequency signal interface module (2) also carry out the collection of frequency signal; power module (1) gathers power supply signal; bus signals interface module (4) data acquisition bus signal; frequency signal, bus signals and power supply signal circuit; access Transient Suppression Diode realizes lightning protection; when data trap normally works; Transient Suppression Diode does not work; be equivalent to open circuit; when high-voltage pulse arrives; Transient Suppression Diode by self short circuit, absorbs instantaneous large-current with high speed, and protection back-end circuit does not affect by big current.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520522267.7U CN204956942U (en) | 2015-07-17 | 2015-07-17 | Machine carries data collection station with lightning protection function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520522267.7U CN204956942U (en) | 2015-07-17 | 2015-07-17 | Machine carries data collection station with lightning protection function |
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| CN204956942U true CN204956942U (en) | 2016-01-13 |
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| CN201520522267.7U Active CN204956942U (en) | 2015-07-17 | 2015-07-17 | Machine carries data collection station with lightning protection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112414451A (en) * | 2020-10-10 | 2021-02-26 | 西安龙资电子科技有限公司 | Airborne platform information acquisition device |
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- 2015-07-17 CN CN201520522267.7U patent/CN204956942U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112414451A (en) * | 2020-10-10 | 2021-02-26 | 西安龙资电子科技有限公司 | Airborne platform information acquisition device |
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