CN108521306B - Interference isolation device for railway coaxial cable - Google Patents
Interference isolation device for railway coaxial cable Download PDFInfo
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- CN108521306B CN108521306B CN201810571168.6A CN201810571168A CN108521306B CN 108521306 B CN108521306 B CN 108521306B CN 201810571168 A CN201810571168 A CN 201810571168A CN 108521306 B CN108521306 B CN 108521306B
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- coaxial cable
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- output end
- cable network
- circuit
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- 238000002955 isolation Methods 0.000 title claims abstract description 69
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 230000008878 coupling Effects 0.000 claims abstract description 10
- 238000010168 coupling process Methods 0.000 claims abstract description 10
- 238000005859 coupling reaction Methods 0.000 claims abstract description 10
- 230000001939 inductive effect Effects 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims description 13
- 230000001012 protector Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/801—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections
- H04B10/802—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections for isolation, e.g. using optocouplers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/806—Arrangements for feeding power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention provides an interference isolation device of a railway coaxial cable, which comprises a coaxial cable network cable input end, a first isolation circuit, a second isolation circuit, a network cable output end and a power-off change-over switch, wherein the first isolation circuit is connected with the first isolation circuit; the first isolation circuit comprises a first photoelectric conversion circuit and a second photoelectric conversion circuit; the second isolation circuit comprises an inductive coupling circuit; when the power supply of the interference isolation device is normal, a connecting channel between the input end of the coaxial cable network cable and the output end of the coaxial cable network cable is set as a first isolation circuit, and interference signals between the input end and the output end of the coaxial cable network cable are isolated by twice photoelectric conversion; when the power supply of the interference isolation device is interrupted, the power-off change-over switch sets a connecting channel between the input end of the coaxial cable network cable and the output end of the coaxial cable network cable as a second isolation circuit, and an electric signal of the input end of the coaxial cable network cable is transmitted to the output end of the coaxial cable network cable through an inductive coupling circuit; the invention has stronger interference isolation capability and can still transmit signals when power is off.
Description
Technical Field
The invention relates to the technical field of signal transmission, in particular to an interference isolation device for a railway coaxial cable.
Background
The railway system has high requirements on the reliability of communication, because the coaxial circuit used for railway communication is generally erected in the field, interference signals often exist, the conventional anti-interference device cannot work under the condition of power failure, and how to design the anti-interference device which has higher performance and can adapt to severe power supply environment is a research direction.
Disclosure of Invention
The invention provides an interference isolation device for a railway coaxial cable, which has stronger interference isolation capability and can still transmit signals when power is off.
The invention adopts the following technical scheme.
The interference isolation device of the railway coaxial cable comprises a coaxial cable network line input end, a first isolation circuit, a second isolation circuit, a network cable network line output end of the network cable and a power-off change-over switch; the first isolation circuit comprises a first photoelectric conversion circuit and a second photoelectric conversion circuit, and the light output end of the first photoelectric conversion circuit is connected with the light input end of the second photoelectric conversion circuit; the second isolation circuit is a passive circuit comprising an inductive coupling circuit;
when the power supply of the interference isolation device is normal, the power-off change-over switch sets a connecting channel between the input end of the coaxial cable network cable and the output end of the coaxial cable network cable as a first isolation circuit, and the first photoelectric conversion circuit converts an electric signal at the input end of the coaxial cable network cable into an optical signal and outputs the optical signal to the optical input end of the second photoelectric conversion circuit; the second photoelectric conversion circuit converts the optical signal provided by the first photoelectric conversion circuit into an electric signal and outputs the electric signal through the network cable output end; isolating interference signals between an input end and an output end of a coaxial cable network line by two photoelectric conversion;
when the power supply of the interference isolation device is interrupted, the power-off change-over switch sets a connecting channel between the input end of the coaxial cable network cable and the output end of the coaxial cable network cable as a second isolation circuit, and an electric signal of the input end of the coaxial cable network cable is transmitted to the output end of the coaxial cable network cable through the inductive coupling circuit.
The power-off change-over switch comprises a relay.
The coaxial cable network cable input end comprises a first local signal input end, a second local signal input end, a first remote signal input end and a second remote signal input end; the coaxial cable network cable output end comprises a first local signal output end, a second local signal output end, a first remote signal output end and a second remote signal output end.
Four groups of interference isolation channels consisting of first and second isolation circuits are arranged in the interference isolation device; the interference isolation channels are mutually independent; the four signal channels from the first local signal input end to the first remote signal output end, from the second local signal input end to the second remote signal output end, and from the first remote signal input end to the first local signal output end, and from the second remote signal input end to the second local signal output end are respectively composed of four groups of interference isolation channels.
And the coaxial cable network wire input end and the coaxial cable network wire output end are respectively connected with a lightning protector.
In the invention, the first isolation circuit realizes the transmission of the signal of the coaxial cable core wire between the input end and the input end by two photoelectric conversion, and the optical isolation structure capable of shielding interference signals is formed by two photoelectric conversion, so that channel error code caused by potential difference of the ground wire of the coaxial circuit or interference can be avoided, and the coaxial cable core wire has strong interference isolation capability.
In the invention, when the power is off, the second isolation circuit can be automatically switched to be passive, the transmission of the signal of the coaxial cable core wire between the input end and the output end is completed by the inductive coupling element, the inductive coupling element forms an electric isolation structure capable of shielding interference signals, the channel error code caused by the potential difference of the ground wire of the coaxial circuit or interference can be avoided, the continuous transmission and interference isolation of the signal under the condition of power off are realized, and the coaxial cable core wire has good adaptability to a severe power supply environment.
In the invention, when the power supply of the device is normal, the core wire signals of the coaxial cable network cable are transferred to the next stage of the network in a twice photoelectric conversion mode, and in the process, the grounding layers of the coaxial cable network cables of the upper and lower stages of the network are disconnected, so that the interference of the grounding layer signals of the upper coaxial cable to the next stage of the network is avoided, the uninterrupted length of the grounding layer of the coaxial cable network is effectively reduced, and the abnormal interference possibly caused by the overlong grounding layer of the coaxial cable network cable to the railway network is avoided.
Drawings
The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic diagram of the circuit principle of the present invention;
FIG. 2 is a schematic diagram of the external interface of the present invention;
fig. 3 is a schematic diagram of a first isolation circuit of the present invention.
Detailed Description
As shown in fig. 1-3, the interference isolation device of the railway coaxial cable comprises a coaxial cable network cable input end, a first isolation circuit, a second isolation circuit, a network cable output end and a power-off change-over switch; the first isolation circuit comprises a first photoelectric conversion circuit and a second photoelectric conversion circuit, and the light output end of the first photoelectric conversion circuit is connected with the light input end of the second photoelectric conversion circuit; the second isolation circuit is a passive circuit comprising an inductive coupling circuit;
when the power supply of the interference isolation device is normal, the power-off change-over switch sets a connecting channel between the input end of the coaxial cable network cable and the output end of the coaxial cable network cable as a first isolation circuit, and the first photoelectric conversion circuit converts an electric signal at the input end of the coaxial cable network cable into an optical signal and outputs the optical signal to the optical input end of the second photoelectric conversion circuit; the second photoelectric conversion circuit converts the optical signal provided by the first photoelectric conversion circuit into an electric signal and outputs the electric signal through the network cable output end; isolating interference signals between an input end and an output end of a coaxial cable network line by two photoelectric conversion;
when the power supply of the interference isolation device is interrupted, the power-off change-over switch sets a connecting channel between the input end of the coaxial cable network cable and the output end of the coaxial cable network cable as a second isolation circuit, and an electric signal of the input end of the coaxial cable network cable is transmitted to the output end of the coaxial cable network cable through the inductive coupling circuit.
The power-off change-over switch comprises a relay.
The coaxial cable network cable input end comprises a first local signal input end, a second local signal input end, a first remote signal input end and a second remote signal input end; the coaxial cable network cable output end comprises a first local signal output end, a second local signal output end, a first remote signal output end and a second remote signal output end.
Four groups of interference isolation channels consisting of first and second isolation circuits are arranged in the interference isolation device; the interference isolation channels are mutually independent; the four signal channels from the first local signal input end to the first remote signal output end, from the second local signal input end to the second remote signal output end, and from the first remote signal input end to the first local signal output end, and from the second remote signal input end to the second local signal output end are respectively composed of four groups of interference isolation channels.
And the coaxial cable network wire input end and the coaxial cable network wire output end are respectively connected with a lightning protector.
Claims (3)
1. The utility model provides an interference isolation device of railway coaxial cable which characterized in that: the interference isolation device comprises a coaxial cable network cable input end, a first isolation circuit, a second isolation circuit, a coaxial cable network cable output end and a power-off change-over switch; the first isolation circuit comprises a first photoelectric conversion circuit and a second photoelectric conversion circuit, and the light output end of the first photoelectric conversion circuit is connected with the light input end of the second photoelectric conversion circuit; the second isolation circuit is a passive circuit comprising an inductive coupling circuit;
when the power supply of the interference isolation device is normal, the power-off change-over switch sets a connecting channel between the input end of the coaxial cable network cable and the output end of the coaxial cable network cable as a first isolation circuit, and the first photoelectric conversion circuit converts an electric signal at the input end of the coaxial cable network cable into an optical signal and outputs the optical signal to the optical input end of the second photoelectric conversion circuit; the second photoelectric conversion circuit converts the optical signal provided by the first photoelectric conversion circuit into an electric signal and outputs the electric signal through the coaxial cable network cable output end; isolating interference signals between an input end and an output end of a coaxial cable network line by two photoelectric conversion;
when the power supply of the interference isolation device is interrupted, the power-off change-over switch sets a connecting channel between the input end of the coaxial cable network cable and the output end of the coaxial cable network cable as a second isolation circuit, and an electric signal of the input end of the coaxial cable network cable is transmitted to the output end of the coaxial cable network cable through an inductive coupling circuit;
the coaxial cable network cable input end comprises a first local signal input end, a second local signal input end, a first remote signal input end and a second remote signal input end; the coaxial cable network cable output end comprises a first local signal output end, a second local signal output end, a first remote signal output end and a second remote signal output end;
four groups of interference isolation channels consisting of first and second isolation circuits are arranged in the interference isolation device; the interference isolation channels are mutually independent; the four signal channels from the first local signal input end to the first remote signal output end, from the second local signal input end to the second remote signal output end, and from the first remote signal input end to the first local signal output end, and from the second remote signal input end to the second local signal output end are respectively composed of four groups of interference isolation channels.
2. The interference isolation device for a railroad coaxial cable of claim 1, wherein: the power-off change-over switch comprises a relay.
3. The interference isolation device for a railroad coaxial cable of claim 1, wherein: and the coaxial cable network wire input end and the coaxial cable network wire output end are respectively connected with a lightning protector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810571168.6A CN108521306B (en) | 2018-06-05 | 2018-06-05 | Interference isolation device for railway coaxial cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810571168.6A CN108521306B (en) | 2018-06-05 | 2018-06-05 | Interference isolation device for railway coaxial cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108521306A CN108521306A (en) | 2018-09-11 |
| CN108521306B true CN108521306B (en) | 2024-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810571168.6A Active CN108521306B (en) | 2018-06-05 | 2018-06-05 | Interference isolation device for railway coaxial cable |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5614939A (en) * | 1995-09-18 | 1997-03-25 | Lucent Technologies Inc. | Coaxial cable service interrupter |
| CN1889504A (en) * | 2006-06-07 | 2007-01-03 | 方勇 | Coaxle cable exchanging system and method |
| CN201018492Y (en) * | 2006-12-31 | 2008-02-06 | 唐芬 | Interface switching circuit for data transmission circuit |
| CN102437940A (en) * | 2011-09-14 | 2012-05-02 | 福建金钱猫电子科技有限公司 | Photoelectric conversion access device |
| CN103873262A (en) * | 2012-12-10 | 2014-06-18 | 中国电信股份有限公司 | Coaxial cable power supply system |
| CN208369591U (en) * | 2018-06-05 | 2019-01-11 | 中国铁路南昌局集团有限公司福州电务段 | Interference and insulation device for railway coaxial cable |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7592880B2 (en) * | 2005-08-10 | 2009-09-22 | Intellon Corporation | Communicating over coaxial cable networks |
-
2018
- 2018-06-05 CN CN201810571168.6A patent/CN108521306B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5614939A (en) * | 1995-09-18 | 1997-03-25 | Lucent Technologies Inc. | Coaxial cable service interrupter |
| CN1889504A (en) * | 2006-06-07 | 2007-01-03 | 方勇 | Coaxle cable exchanging system and method |
| CN201018492Y (en) * | 2006-12-31 | 2008-02-06 | 唐芬 | Interface switching circuit for data transmission circuit |
| CN102437940A (en) * | 2011-09-14 | 2012-05-02 | 福建金钱猫电子科技有限公司 | Photoelectric conversion access device |
| CN103873262A (en) * | 2012-12-10 | 2014-06-18 | 中国电信股份有限公司 | Coaxial cable power supply system |
| CN208369591U (en) * | 2018-06-05 | 2019-01-11 | 中国铁路南昌局集团有限公司福州电务段 | Interference and insulation device for railway coaxial cable |
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|---|---|
| CN108521306A (en) | 2018-09-11 |
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