CN206790589U - Video camera for the anti-strong electromagnetic of underground pipe gallery - Google Patents
Video camera for the anti-strong electromagnetic of underground pipe gallery Download PDFInfo
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- CN206790589U CN206790589U CN201720486428.0U CN201720486428U CN206790589U CN 206790589 U CN206790589 U CN 206790589U CN 201720486428 U CN201720486428 U CN 201720486428U CN 206790589 U CN206790589 U CN 206790589U
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Abstract
It the utility model is related to the video camera in camcorder technology field, the more particularly, to electromagnetism interference of underground pipe gallery.Including camera lens, camera housing, video image induction module, video signal processing module, twisted-pair visual frequency signal transmission module, power circuit, video signal processing module is provided with video image input circuit, the shell of the video camera is metal material, supporting on the video image input circuit to be connected with that signal is single-ended to turn both-end module, output driving module, balanced signal suppression module.The utility model has the advantage of the shell of video camera to use all-metal material, effectively suppresses the strong electromagnetic space radiation interference brought from pipe gallery high voltage power cable.
Description
Technical field
It the utility model is related to camcorder technology field, more particularly, to the anti-strong electromagnetic of underground pipe gallery
Video camera.
Background technology
Underground pipe gallery is exactly " Municipal underground utilities synthesis ", i.e., walks corridor in Front road or pipeline and build
Make a underground continuous structure thing, by the municipal pipeline of conventional direct-burried, such as feedwater, rainwater, sewage, heat supply, electric power, communication,
The various pipelines such as combustion gas, industry are concentrated into wherein, and set special corollary system, are the important foundations for ensureing city operations
Facility and " lifeline ".To ensure the security of pipe gallery internal pipeline, special video monitoring system need to be set, to pipe
The operation conditions of pipeline in corridor is monitored, due to being furnished with the high pressures such as 35KV, 110KV and EHV XLPE power cable in piping lane,
So that strong electromagnetic interference in piping lane be present, the normal operation of video monitoring system is had a strong impact on.
The content of the invention
The technical problems to be solved in the utility model be how overcome the deficiencies in the prior art, there is provided one kind be used for underground it is comprehensive
Close the video camera of the anti-strong electromagnetic of piping lane.
The technical scheme that the utility model uses to achieve the above object is：A kind of anti-forceful electric power for underground pipe gallery
The video camera of magnetic disturbance, including it is camera lens, camera housing, video image induction module, video signal processing module, double
Twisted wire video signal transmission module, power circuit, video signal processing module is provided with video image input circuit, its feature
It is, the shell of the video camera is metal material, and supporting on the video image input circuit to be connected with single-ended turn of signal double
End module, output driving module, balanced signal suppression module；
Video image input circuit is provided with electromagnetic radiation suppression circuit, in the power end and earth terminal of loop active device
Access 0.1 μ F ceramic disc capacitor；
Signal is single-ended to turn both-end module by the single-ended signal conversion processing that video signal processing module passes over into both-end
Signal, and the video non-equilibrium signal of reception is converted into video balance signal, it is defeated so as to which video balance signal is passed to
Go out drive module further to amplify；
The high frequency in video balance signal after the amplification that balanced signal suppression module exports output driving module is with surpassing
High-frequency electromagnetic interference signal is bidirectional balanced by being set in balanced signal suppression module.
Further, the camera housing is provided with ground terminal, can be grounded camera housing, improves anti-electromagnetism and does
Disturb ability.
Further, the output driving module uses differential lines driving amplifier as drive circuit.
Further, to prevent the high-frequency signal in the video signal processing module to be coupled to power line and externally produce high
Radio-frequency radiation, electromagnetic interface filter is accessed in the place of power line close to input-output socket.
The utility model has the advantage of the shell of video camera to use all-metal material, effectively suppresses high from pipe gallery
The strong electromagnetic space radiation interference that piezoelectric forces banded cable comes, in addition, very big using the combination of balance driver and differential receiver
The ability for improving anti-noise jamming, and using twisted-pair feeder carry out signal transmission, ensure signal transmission quality premise
Under, transmission range is greatly improved, using vision signal balanced transmission line, it is only necessary to two connection lines, reduce and apply
Work cost and difficulty of construction.
Brief description of the drawings
Fig. 1 the utility model overall structure diagrams.
Fig. 2 the utility model is single-ended to become both-end, drive amplification and AF panel module circuit diagram.
Embodiment
A kind of video camera of anti-strong electromagnetic for underground pipe gallery, including camera lens, camera housing,
Video image induction module, video signal processing module, twisted-pair visual frequency signal transmission module, power circuit, in vision signal
Processing module is provided with video image input circuit, it is characterised in that the shell of the video camera is metal material, the video
It is supporting on image input circuit to be connected with that signal is single-ended to turn both-end module, output driving module, balanced signal suppression module；
Video image input circuit adds the special of electromagnetic radiation suppression on the basis of conventional video image processing circuit
Magnet ring.Video image processing circuit is tried power line and reached with being grounded surrounded loop area minimum in the design
0.000001M2.The region or area that partial loop area can not reduce, which reduce, to be restricted, and we are in loop active device
The ceramic disc capacitor of power end and earth terminal access 0.1uF, with this, to shorten active device, caused differential mode radiates on the power line
The loop paths of electric current, effectively inhibit part electromagnetic radiation.To prevent the high frequency in above-mentioned video image processing circuit plate from believing
Number it is coupled to power line and externally produces high frequency radiation, and prevent from introducing the power supply with high-frequency electromagnetic interference by extraneous, in electricity
Electromagnetic interface filter has been accessed in the place of source line close to input-output socket.
The single-ended both-end module that turns of signal is by traditional (75 ohm of analog video signal, non-complete statement in the art
Definition, it is proposed that be changed to：Analog video signal (impedance be 75 ohm)) single-ended signal that passes over of video signal processing module
Conversion processing is converted to video balance signal into double-end signal, and by the video non-equilibrium signal of reception, so as to which video is put down
Weighing apparatus signal passes to output driving module and further amplified；
Differential lines that wherein output driving module uses driving operational amplifier-three dB bandwidth for 63MHZ, use is positive and negative
Power supply is powered, and its differential gain error (DG) is 0.17%, and differential phase error (DP) is 0.06 °, and the both-end of driver turns
Change and use operating amplifier with current feedback (CFA), wherein phase input impedance is high (2M Ω), and band during 0.1Db AV=2 is a width of
The a width of 250MHZ of band when 50MHZ, -3dB Av=1.DG is that 0.01%, DP is 0.01 ° (during AV=1).
The high frequency in video balance signal after the amplification that balanced signal suppression module exports output driving module is with surpassing
High-frequency electromagnetic interference signal is bidirectional balanced by being set in balanced signal suppression module.
The camera housing is provided with ground terminal, can be grounded camera housing, improves anti-electromagnetic interference capability.
The output driving module is using differential lines driving amplifier as drive circuit.
As shown in figure 1, the utility model partial circuit schematic diagram, T1 effects are reversely to amplify, and T2 effects are to follow amplification,
The non-equilibrium vision signal output of script is so converted into video balance output；R3 and R5 is the output of matching this section and next section
The input of circuit is used；This section gain is one.T3 and T4 is actually a double follower；R3, R5 are front stage build-out resistors, adjust R6
Adjustable abridged edition stage gain, R8, R10 are and twisted-pair feeder build-out resistor.
In Surveillance center, the vision signal after long-distance Double-strand transmission is put down by special reception device
Weighing apparatus amplification and the conversion (balanced-unbalanced conversion) for carrying out both-end-single-ended；Compensation network is different according to length of twisted pair and carries out
Different compensation, the vision signal being exaggerated finally is carried out integer and Hyblid Buffer Amplifier is exported to video record storage device.
For above-described embodiment simply to illustrate that technical concepts and features of the present utility model, the purpose is to be to allow this area
Interior those of ordinary skill can understand content of the present utility model and implement according to this, can not be limited with this of the present utility model
Protection domain.Every equivalent change or modification according to made by the essence of the utility model content, it should all cover in this reality
With in new protection domain.
Claims (4)
1. a kind of video camera of anti-strong electromagnetic for underground pipe gallery, including camera lens, camera housing, regard
Frequency image sensing module, video signal processing module, twisted-pair visual frequency signal transmission module, power circuit, at vision signal
Reason module is provided with video image input circuit, it is characterised in that the shell of the video camera is metal material, the video figure
It is connected with that signal is single-ended to turn both-end module, output driving module, balanced signal suppression module as supporting on input circuit；
Video image input circuit is provided with electromagnetic radiation suppression circuit, is accessed in the power end and earth terminal of loop active device
0.1 μ F ceramic disc capacitor；
Signal is single-ended to turn both-end module by the single-ended signal conversion processing that video signal processing module passes over into double-end signal,
And the video non-equilibrium signal of reception is converted into video balance signal, so as to which video balance signal is passed into output driving
Module is further amplified；
The high frequency and hyperfrequency in video balance signal after the amplification that balanced signal suppression module exports output driving module
Electromagnetic interference signal is bidirectional balanced by being set in balanced signal suppression module.
2. the video camera of the anti-strong electromagnetic according to claim 1 for underground pipe gallery, it is characterised in that：Institute
State camera housing and be provided with ground terminal, camera housing can be grounded, improve anti-electromagnetic interference capability.
3. the video camera of the anti-strong electromagnetic according to claim 1 for underground pipe gallery, it is characterised in that：Institute
Output driving module is stated using differential lines driving amplifier EL2200 as drive circuit.
4. the video camera of the anti-strong electromagnetic according to claim 1 for underground pipe gallery, it is characterised in that：For
Prevent the high-frequency signal in the video signal processing module to be coupled to power line and externally produce high frequency radiation, connect in power line
Electromagnetic interface filter has been accessed in the place of nearly input-output socket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720486428.0U CN206790589U (en) | 2017-05-04 | 2017-05-04 | Video camera for the anti-strong electromagnetic of underground pipe gallery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720486428.0U CN206790589U (en) | 2017-05-04 | 2017-05-04 | Video camera for the anti-strong electromagnetic of underground pipe gallery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206790589U true CN206790589U (en) | 2017-12-22 |
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ID=60710177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720486428.0U Active CN206790589U (en) | 2017-05-04 | 2017-05-04 | Video camera for the anti-strong electromagnetic of underground pipe gallery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206790589U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257653A (en) * | 2020-01-16 | 2020-06-09 | 湘潭大学 | Electromagnetic radiation prediction method under underground pedestrian passageway scene |
-
2017
- 2017-05-04 CN CN201720486428.0U patent/CN206790589U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257653A (en) * | 2020-01-16 | 2020-06-09 | 湘潭大学 | Electromagnetic radiation prediction method under underground pedestrian passageway scene |
| CN111257653B (en) * | 2020-01-16 | 2021-06-22 | 湘潭大学 | Electromagnetic radiation prediction method under underground pedestrian passageway scene |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 266000 Room 101-15, Block C, Pangu Passenger Space, 100 Torch Road, Qingdao High-tech Zone, Shandong Province Patentee after: Huagao Digital Technology Co., Ltd. Address before: North Cheng Hau Road 266000 in Shandong province Qingdao City, No. 15 room 121 Patentee before: QINGDAO SMART CITY INDUSTRIAL DEVELOPMENT CO., LTD. |
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| CP03 | Change of name, title or address |