CN110365369A - A kind of power carrier communication system for supporting long distance transmission - Google Patents
A kind of power carrier communication system for supporting long distance transmission Download PDFInfo
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- CN110365369A CN110365369A CN201910797419.7A CN201910797419A CN110365369A CN 110365369 A CN110365369 A CN 110365369A CN 201910797419 A CN201910797419 A CN 201910797419A CN 110365369 A CN110365369 A CN 110365369A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/58—Repeater circuits
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
A kind of power carrier communication system for supporting long distance transmission, including the first power carrier communication module, the second power carrier communication module, power carrier filter apparatus and power carrier modulating equipment；First power carrier communication module and the second power carrier communication module interconnect, internal includes power detection module and power line carrier, PLC signal amplification module, first power carrier communication module and the second power carrier communication module are respectively connected with power carrier filter apparatus, and each power carrier filter apparatus is respectively connected with power carrier modulating equipment.Optionally, it when there is multiple ports, needs to introduce combiner or splitter and connects the signal of multiple input ports or output port.The present invention is by introducing power line carrier, PLC signal trunking, since application processing module structure can be removed, the relaying of power carrier signal can be completed using only the signal processing circuit of communication processor, system design is more simple, cost reduces, and power consumption is also lower.
Description
Technical field
The invention belongs to power-line carrier communication field, in particular to a kind of power carrier for supporting long distance transmission
Communication system.
Background technique
It is power-line carrier communication with the immediate prior art of this technology, in electric power carrier communication technology, passes
The power line carrier, PLC signal of transmission of data is modulated on the high-frequency modulation signal of 0-50MHz, the superposition of this high-frequency modulation signal
On the low-frequency ac electric power signal of the 50Hz of power line, power carrier signal is constituted, as electric power cable is transferred to power train
In other terminals of system.
The main application scenarios of traditional electric power carrier communication technology are Homeplug online, and indoor access terminals are passed through electric power
Cat signal modulation at power carrier signal, by the power line transmission in family get home in router.Transmission range is all very
Closely, generally within 100 meters.But in the scene of long distance transmission, such as electric power monitoring system, transmit power carrier signal
Apart from it is far when, due to transmission loss of the low-frequency ac electric power signal on power line much smaller than high frequency power line carrier, PLC believe
Number, therefore in many cases, it needs to relay power line carrier, PLC signal, the device signal for being just able to achieve long range passes
It is defeated.
But existing power carrier trunking, in order to be multiplexed existing power line carrier, PLC equipment as far as possible, usually
Using two back-to-back design methods of power carrier communication module, as shown in Figure 1.It is responsible for pass through using a communication module
The power line carrier, PLC signal of transmission attenuation demodulates to form original digital information, and application processing module is according to the application requirement of relaying
Data processing (Error Control, routing relaying etc.) is carried out, digital information is sent to second communication module, is re-modulated into electricity
Power carrier communication signal is added on low-frequency ac electric power signal, forms power carrier signal and sends.This equipment needs
Two communication modules, simultaneously as needing to carry out the digital signal of demodulation using processing (such as Route Selection, Error Control
Deng), it is therefore desirable to an application processing module completes the work of application layer, and wherein application processing module is usually by application processor
It realizes.Due to the existing communication module of power carrier trunking, and there is application processing module, such framework is from cost, equipment
Complexity, equipment size, power consumption etc. are all very high.Such as if realizing using chip, need to design simultaneously using processing
Device chip (AP) and communication processor chip (CP), while needing to run the processing that operating system completes application layer, entire SoC core
The complexity of piece is very high, and then the cost of equipment, size, power consumption, can all have loss in performance.
In wireless communication field, there is wireless relay apparatus as radio repeater station (or referred to as repeater) very early.
The main function of repeater, aiming at the region that wireless signal is blocked, by placing one for reception of wireless signals and putting
The equipment forwarded greatly promotes the wireless coverage ability in the region that is blocked.But because wireless device is carried out by wireless space
It propagates, the work of wireless relay apparatus is very simple, and all wireless signals are exactly received in designated frequency band, then will connect
The signal amplification received, is broadcasted using omnidirectional or directional aerial.Because in all wireless frequencies of radio repeater station relaying
Power attenuation in section relatively, in order to design simplicity, is all amplified using same ratio.For example, the signal of frequency point 1 connects
Receipts intensity is -90dBm, and the signal receiving strength of frequency point 2 is -91dBm, passes through the amplifier of full frequency band 30dB, the signal of frequency 1
Emissive porwer becomes -60dBm, and frequency 2 becomes -61dBm.For example the wireless discharging-directly station of typical case's GSM downlink works frequently
The schematic diagram of rate is all unanimous on the whole, therefore wireless discharging-directly station in the decaying of all frequencies of the frequency separation of 935-954MHz
Amplified on all frequency points using constant power.
Since radio repeater station only does reception and the amplification forwarding of radiofrequency signal, and using in the amplification of constant power multiple
After, therefore relay station equipment does not have Base-Band Processing and application layer process, does not need using operating system, the complexity of whole equipment
Degree, cost can significantly reduce.But in power line carrier, PLC field, due on electric power cable, signal different frequency it
Between transmission attenuation differ greatly, (for example electric force carrier transmission is used in 10km transmission range, on 1MHz and 50MHz frequency point
It is even more that pad value may differ 50dB).If signal amplification is carried out using same ratio, in order to avoid high-frequency signal
Power limit is not exceeded, needs the attenuation of the signal for lower frequency to amplify, then relative high frequency part
Signal amplification not enough, communication quality can generate decline, limit the signal quality of relaying.
Summary of the invention
The purpose of the present invention is to provide a kind of power carrier communication systems for supporting long distance transmission, to solve in use
When equipment carries out power line carrier, PLC relaying, cannot achieve, which can be amplified to maximum to the signal in all frequency ranges, permits
Perhaps transmission power, the problem of to promote power carrier repeater span to greatest extent.
To achieve the above object, the invention adopts the following technical scheme:
A kind of power carrier communication system for supporting long distance transmission, including the first power carrier communication module, the second electricity
Power carrier communication module, power carrier filter apparatus and power carrier filter apparatus；First power carrier communication module and second
Power carrier communication module connection, the first power carrier communication module and the second power carrier communication module are all connected to electric power load
Wave filter apparatus, each power carrier filter apparatus are all connected to power carrier modulating equipment；First carrier communication module will be defeated
The output end of the second power carrier communication module is output to after the signal amplification entered；Second power carrier communication module is by input
It is output in first carrier communication module after signal amplification；
First power carrier communication module includes power line carrier, PLC signal amplification module, power detection module and annular
Device；Circulator, power detection module and power line carrier, PLC signal amplification module are sequentially connected；Each circulator is all connected to electricity
Power carrier wave filter apparatus；
Second power carrier communication module includes power line carrier, PLC signal amplification module, power detection module, circulator
And splitter；Circulator, power detection module and power line carrier, PLC signal amplification module are sequentially connected, power line carrier, PLC letter
Number amplification module connects splitter；Power detection module is for the power line carrier, PLC signal after filtering out power carrier, many
It is detected respectively in the power on two frequency bins, the power line carrier, PLC signal power value transmitting that power detection module will test
Give power line carrier, PLC signal amplification module；Power line carrier, PLC signal amplification module is according to the power from power detection module
Value is adjusted to the amplification factor of amplifier the power line carrier, PLC on each frequency point can be amplified to the frequency point maximum allowable
In transmission power.
Further, circulator be located at power carrier signal input position, power carrier signal for receiving input,
And the output end of the power carrier signal of input is separated with input terminal.
Further, when the input signal more than one of the first power carrier communication module, the first power line carrier, PLC mould
The circulator quantity of block is more than one, is connected on multiple circulators using combiner at this time, combiner and power detection mould
Block and circulator are separately connected, and splitter is connect with circulator；In first power carrier communication module combiner need and it is multiple
The output port of circulator is connected, and is combined to from multiple power carrier input signal, and combiner is used for multiple power
Multicarrier communication signal amplifies.
Further, when the circulator of the first power carrier communication module is more than one, the second power line carrier, PLC mould
Block needs that the amplified signal that the second power carrier communication module exports is shunted to multiple first power carriers and is led to using splitter
On the circulator for believing module, splitter and power line carrier, PLC signal amplification module and the first power carrier communication module circulator
It is separately connected.
Further, power detection module is connected with the output port of combiner in the second power carrier communication module.
Further, the power carrier communication system may include more than two power carrier communication module, and can
It completes more than the mutual relaying between two-way power line carrier, PLC signal.
Further, the system is in the relay system of any wired electric signal transmission device.
Compared with prior art, the present invention has following technical effect:
The present invention is by introducing power line carrier, PLC signal trunking, since application processing module structure can be removed,
The relaying of power carrier signal can be completed in the radio frequency signal processing circuit being only used only in communication processor, and system designs more
Simply, cost reduces, and power consumption is also lower.
The present invention can be detected for the different degrees of of the power line carrier, PLC signal fadeout on different frequent points by frequency point
Mechanism is realized that the power amplification multiple of signal on different frequency follows signal fadeout degree to be adjusted, is realized all frequency points
On signal be all amplified to maximum allowable transmission power, therefore more remote signal attenuation loss can be resisted, to realize
It is farther apart from upper relaying.
Detailed description of the invention
Fig. 1 traditional power carrier relay system structure.
Fig. 2 is present system schematic diagram.
Specific embodiment
Below in conjunction with attached drawing, the present invention is further described:
Referring to Fig. 2, a kind of power carrier communication system for supporting long distance transmission, including the first power line carrier, PLC mould
Block, the second power carrier communication module, power carrier filter apparatus and power carrier filter apparatus；First power line carrier, PLC mould
Block and the connection of the second power carrier communication module, the first power carrier communication module and the second power carrier communication module are all connected with
To power carrier filter apparatus, each power carrier filter apparatus is all connected to power carrier modulating equipment.
First power carrier communication module includes power line carrier, PLC signal amplification module, power detection module and annular
Device；Circulator, power detection module and power line carrier, PLC signal amplification module are sequentially connected, when there is multiple input signals,
Need to introduce combiner, combiner is connect with multiple circulators, and the power line carrier, PLC signal of multiple inputs is combined；Each ring
Shape device is respectively connected with power carrier filter apparatus；
Second power carrier communication module includes power line carrier, PLC signal amplification module, power detection module, circulator；
Circulator, power detection module and power line carrier, PLC signal amplification module are sequentially connected.When power line carrier, PLC signal amplifies
When the signal of module needs to be output to the power splitter of multiple output ends, need to introduce splitter, splitter believes isolated multichannel
It number is output on the corresponding circulator input port of multiple output signals；
The power line carrier, PLC signal amplification module and the second power carrier communication module of first power carrier communication module
Circulator connection.The splitter of second power carrier communication module and multiple circulators of the first power carrier communication module connect
It connects.
Circulator: positioned at the position of signal input.For bi-directional electric power multicarrier communication signal, need carrying out electric power
After carrier signal filtering, the power line carrier, PLC signaling zone of uplink and downlink is separated using circulator, in uplink and downlink side
It carries out power line carrier, PLC signal respectively upwards and carries out power detection in each frequency point, finally on uplink and downlink direction respectively
Carry out power amplification.Circulator can be used commercial radiofrequency signal circulator and realize.
Circulator needs are connected with the power carrier filter apparatus of peripheral circuit, receive the power line carrier, PLC letter of input
Number；Circulator is also connected with the power line carrier, PLC signal amplification module of other power carrier communication modules, receives and needs to send back to
To the relaying amplified signal from other ports of signal port.Circulator also needs to be connected with power detection module, will input
Signal is sent into power detection module, detects power of the input signal on different frequent points.
Combiner: first if power carrier communication module amplifies the power line carrier, PLC signal that multichannel inputs
It first needs to be combined the multiple power multicarrier communication signal before amplification using combiner.The power carrier after combining is led to again
Letter signal carries out the power detection of each frequency point, finally carries out signal amplification output according to testing result.Combiner can be used
Commercial radio frequency signal combiner is realized.
Combiner needs are connected with the output port of multiple circulators, are combined to multiple circulator output signals.It closes
Road device also needs to be connected with power-sensing circuit.
Power detection module: detecting power of the filtered power line carrier, PLC signal on different frequent points,
The signal power value of different frequency range after testing is passed to power line carrier, PLC signal amplification module by power detection module；Electricity
Power carrier communication signal amplification module is according to the high-frequency modulation signal performance number from power detection module, by the amplification of amplifier
Multiple is adjusted to that the high-frequency modulation signal on different frequent points can be amplified in maximum allowable transmission power.
The frequency interval of power detection module detection can be according to the frequency point of transmission power line carrier, PLC signal, transmission cable
Transmission characteristic selected.The interval of the frequency point of the power detection of setting can be fixed, and be also possible to according to transmission line
The transmission characteristic of cable carries out changing distance design.
Power line carrier, PLC signal power value after testing is passed to power line carrier, PLC signal by power detection module
Amplification module.If the transmission range and topology of cable be it is pre-set will not change, the power detection
Module, which can be, is transmitted directly to power line carrier, PLC signal amplification module according to value of the measurement in advance after good, and no longer needs true
Positive carry out power detection.
Power detection module is connected with circulator output port, optionally, when have multichannel input signal require carry out function
When rate detects, multichannel input signal first passes through combiner combining, and power detection module is connected with the output port of combiner.Power
The output port of detection module connects power line carrier, PLC signal amplification module.
Power line carrier, PLC signal amplification module: power line carrier, PLC signal amplification module only needs to handle the small of high band
Power communication signal, according to the signal value from power detection module, the amplification factor of amplifier is adjusted to can will be different
Signal on frequency point is amplified in maximum allowable transmission power.For example, the signal reception power spectrum density of 20MHz frequency point be-
The signal reception power spectrum density of 60dBm/Hz, 40MHz frequency point is -62dBm/Hz, and the signal reception power spectrum of 60MHz frequency point is close
Degree is -65dBm/Hz, according to the maximum transmission power limit value of power line carrier, PLC) (such as -50dBm/Hz in the U.S.), then should
The corresponding signal of 20MHZ frequency point is amplified into 12dB, corresponding amplified signal frequency range should be each expansion in left and right centered on 20MHz
A frequency range is opened up, specific width should be determined according to the frequency point ranges of measurement, such as the 0-30MHz of this example, in 30-50MHz
Corresponding signal amplifies 12dB, amplifies 15dB in the corresponding signal of 50-60MHz.
Power line carrier, PLC signal amplification module is connected with power detection module, receive from signal detection module to not
With the power detection result of the power line carrier, PLC signal of frequency point.Power line carrier, PLC signal amplification module also with need it is defeated
The circulator input port of electric power cable out is connected, and amplified power line carrier, PLC signal is exported.Power line carrier, PLC letter
Number amplification module only handles the small-power signal of communication of high band, and commercial radio frequency signal amplifiers can be used and realize.
Power line carrier, PLC signal amplification module more than use, can be for the power line carrier, PLC letter on different frequent points
Number decline it is different degrees of, by frequency point testing mechanism, realize that the power amplification multiple of signal on different frequency follows signal to decline
The degree of falling is adjusted, and realizes the signal on all frequency points being all amplified to maximum allowable transmission power, therefore can resist more
Remote signal attenuation loss, to realize farther apart from upper relaying.Splitter: it is optional, when the electricity of relaying amplification
When power carrier communication signal needs to be output on multiple ports, the power line carrier, PLC signal being amplified needs to be sent to branch
Device shunts to the circulator of multiple output ends, is output on electric power cable by circulator signal.Commercialization can be used in splitter
Radiofrequency signal power splitter realize.
Splitter with need the signal amplification module of branch and connect, it is also necessary to by the signal of branch and need output signal
The input port of multiple circulators connects.
Peripheral circuit needs power carrier filter module: due to being modulated at powerful electric power when power line carrier, PLC signal
On signal, therefore before carrying out frequency point power detection, it is necessary first to filter the low-frequency ac signal in power carrier signal
It removes, such as the domestic alternating current for using 50Hz, then needs to isolate out power carrier signal using filter, after filtering
Power line carrier, PLC signal be high-frequency signal in 0-50MHz frequency range, which just can be carried out power detection.The filter module
Commercial high-frequency coupler can be used to realize.By filtered power line carrier, PLC signal, the small-power in 0-50MHz
Radiofrequency signal (general performance number is less than -20dBm), such power line carrier, PLC signal trunking only need to handle radio frequency letter
Number, it is no longer necessary to powerful alternating current circuit can be used common CMOS technology and realize.
Power carrier filter module needs are connected with the signal port of the circulator to induction signal.
Peripheral circuit further includes power carrier modulating equipment:, will by the power carrier modulating equipment of electric power cable front end
The high-frequency signal of power line carrier, PLC is modulated on the low-frequency ac electric power signal of 50Hz, is finally relayed to power carrier medium
On.
Power carrier modulating equipment needs are connected with power carrier filter apparatus.
Claims (7)
1. a kind of power carrier communication system for supporting long distance transmission, which is characterized in that including the first power line carrier, PLC mould
Block, the second power carrier communication module, power carrier filter apparatus and power carrier filter apparatus；First power line carrier, PLC mould
Block and the connection of the second power carrier communication module, the first power carrier communication module and the second power carrier communication module are all connected with
To power carrier filter apparatus, each power carrier filter apparatus is all connected to power carrier modulating equipment；First carrier communication
Module is output to the output end of the second power carrier communication module after amplifying the signal of input；Second power carrier communication module
It is output in first carrier communication module after the signal of input is amplified；
First power carrier communication module includes power line carrier, PLC signal amplification module, power detection module and circulator；Ring
Shape device, power detection module and power line carrier, PLC signal amplification module are sequentially connected；Each circulator is all connected to electric power load
Wave filter apparatus；
Second power carrier communication module includes power line carrier, PLC signal amplification module, power detection module, circulator and divides
Road device；Circulator, power detection module and power line carrier, PLC signal amplification module are sequentially connected, and power line carrier, PLC signal is put
Big module connects splitter；Power detection module is for the power line carrier, PLC signal after filtering out power carrier, no less than two
Power on a frequency point is detected respectively, and the power line carrier, PLC signal power value that power detection module will test passes to electricity
Power carrier communication signal amplification module；Power line carrier, PLC signal amplification module according to the performance number from power detection module,
The amplification factor of amplifier is adjusted to the power line carrier, PLC on each frequency point can be amplified to the maximum allowable hair of the frequency point
It penetrates on power.
2. a kind of power carrier communication system for supporting long distance transmission according to claim 1, which is characterized in that annular
Device is located at the position of power carrier signal input, power carrier signal for receiving input, and the power carrier of input is believed
Number output end separated with input terminal.
3. a kind of power carrier communication system for supporting long distance transmission according to claim 1, which is characterized in that optional
, when the input signal more than one of the first power carrier communication module, the circulator number of the first power carrier communication module
It measures more than one, is connected on multiple circulators using combiner at this time, combiner and power detection module and circulator are distinguished
Connection, splitter are connect with circulator；Combiner needs the output end with multiple circulators in first power carrier communication module
Mouthful be connected, to being combined from multiple power carrier input signal, combiner be used for multiple power multicarrier communication signal into
Row amplification.
4. a kind of power carrier communication system for supporting long distance transmission according to claim 3, which is characterized in that when
When the circulator of one power carrier communication module is more than one, the second power carrier communication module is needed using splitter, by
The amplified signal of two power carrier communication modules output shunts on the circulator of multiple first power carrier communication modules, branch
Device is separately connected with power line carrier, PLC signal amplification module and the first power carrier communication module circulator.
5. a kind of power carrier communication system for supporting long distance transmission according to claim 1, which is characterized in that second
Power detection module is connected with the output port of combiner in power carrier communication module.
6. special according to claim 1 to a kind of power carrier communication system for supporting long distance transmission described in 5 any one
Sign is that the power carrier communication system may include more than two power carrier communication module, and can complete be more than
Mutual relaying between two-way power line carrier, PLC signal.
7. special according to claim 1 to a kind of power carrier communication system for supporting long distance transmission described in 6 any one
Sign is that the system is in the relay system of any wired electric signal transmission device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115065374A (en) * | 2022-04-27 | 2022-09-16 | 深圳市国电科技通信有限公司 | Power line carrier communication transceiver and power line carrier communication system |
| CN116743211A (en) * | 2023-08-16 | 2023-09-12 | 北京前景无忧电子科技股份有限公司 | Anti-interference method for power carrier communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115065374A (en) * | 2022-04-27 | 2022-09-16 | 深圳市国电科技通信有限公司 | Power line carrier communication transceiver and power line carrier communication system |
| CN116743211A (en) * | 2023-08-16 | 2023-09-12 | 北京前景无忧电子科技股份有限公司 | Anti-interference method for power carrier communication |
| CN116743211B (en) * | 2023-08-16 | 2023-10-27 | 北京前景无忧电子科技股份有限公司 | Anti-interference method for power carrier communication |
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