CN105389968A - Electric line broadband carrier communication module for low voltage centralization meter reading terminal - Google Patents
Electric line broadband carrier communication module for low voltage centralization meter reading terminal Download PDFInfo
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- CN105389968A CN105389968A CN201510960023.1A CN201510960023A CN105389968A CN 105389968 A CN105389968 A CN 105389968A CN 201510960023 A CN201510960023 A CN 201510960023A CN 105389968 A CN105389968 A CN 105389968A
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
The present invention relates to an electric line broadband carrier communication module for a low voltage centralization meter reading terminal based on an OFDM technology. According to the present invention, the OFDM technology is used; the structure of the communication module comprises a modulation demodulation unit, a PHY unit, a transmitting unit, a receiving unit, and a filtering coupling unit; the module has the following advantages that the OFDM-based technology is used for the low voltage centralization meter reading terminal so as to effectively resist multiple path interference and make the interference signal can be reliably received, and even in the case of sever interference on the power grid, the high bandwidth can be provided and the bandwidth transmission efficiency can be ensured so as to make the data be subjected to reliable high-speed communication; and the carrier communication speed is high, and the data transmission can be completed within the extremely short time so as to substantially reduce the influence of the accidental interference, and even if a communication fails, the re-transmission can be performed, and the reliable data can be ensured.
Description
Technical field
What the present invention relates to is a kind of power wire broadband carrier communication module for low pressure centralized automatic meter-reading terminal based on OFDM technology, belongs to power information and gathers field.
Background technology
Power-line carrier communication refers to a kind of communication mode utilizing power line transmission data.Line of electric force is the transmission channel of a kind of extremely unstable strong noise, overdamp, realize reliable high speed power line communication, the impact that the principal elements such as the signal attenuation that the online noise of low-voltage distribution, impedance fluctuations, distribution net work structure, Electro Magnetic Compatibility and line impedance and capacitive load cause are transmitted data must be solved.Bandwidth carrier uses digitized multi-carrier frequency multiplexing technique, wider carrier frequency band is divided into multiple subcarrier, loads mutually orthogonal high frequency carrier respectively and modulate data, realize multicarrier parallel communications.Power line carrier market has occurred some carrier telecommunications adopting digitized multi-carrier frequency multiplexing techniques, but traffic rate is lower, scene success ratio of checking meter is not high yet, and is not suitable for the field practice application of carrier meter reading.
Summary of the invention
What the present invention proposed is a kind of power wire broadband carrier communication module for low pressure centralized automatic meter-reading terminal based on OFDM technology, its objective is and the technology based on OFDM is applied to low voltage power line carrier meter reading terminal, make carrier communication data high-speed reliable, and there is the power wire broadband carrier module of several data communication interface.
Technical solution of the present invention: based on the power wire broadband carrier communication communication module for low pressure centralized automatic meter-reading terminal of OFDM technology, utilize OFDM technology, modular structure comprises modem module, PHY unit, transmitting element, receiving element, filter-coupler unit, wherein the first signal input/output terminal of modem module and the first signal input/output end of PHY unit corresponding be connected, the signal output part of modem module is connected with the signal input part of transmitting element, the signal input part of modem module is connected with the signal output part of receiving element, transmitting element signal output part be connected with the signal input part of filter-coupler unit, the signal output part of filter-coupler unit is connected with the signal input part of receiving element, the signal input/output end of filter-coupler unit is corresponding with the signal input/output terminal of low pressure centralized automatic meter-reading terminal forceful electric power interface to be connected.
When sending signal, modem module utilizes transmitting element to amplify after communication data is modulated to Multi-channel high-frequency signal, and is loaded into line of electric force by coupling filter unit;
During Received signal strength, by the high-frequency carrier signal that other power wire broadband carrier modules be carried on line of electric force send, being input to receiving element by coupling filter unit, then entering modem module, is communication data by Multi-channel high-frequency signal receiving.
Advantage of the present invention:
1) technology based on OFDM is applied to low voltage power line carrier meter reading terminal, effectively can resist multipath interference, the signal disturbed can be received reliably, even if when electrical network is subject to severe jamming, also can provide high bandwidth and ensure bandwidth for transmission efficiency, thus making the high speed reliable communication of data;
2) power wire broadband carrier module communication speed is high, can complete the transmission of data, can greatly reduce the impact suffering bursty interference, even if a communication failure, also can retransmit rapidly, guarantee that data are reliable within the extremely short time;
3) the ethernet communication mode by Ethernet unit extensions, makes bandwidth carrier module serial communication and ethernet communication self-adaptation.
Accompanying drawing explanation
Accompanying drawing 1 is the power wire broadband carrier communication module for low pressure centralized automatic meter-reading terminal based on OFDM technology
Structural representation.
Accompanying drawing 2 is structured flowcharts of OFDM transceiver.
Accompanying drawing 3 is transmitting element circuit diagrams.
Accompanying drawing 4 is receiving element circuit diagrams.
Accompanying drawing 5 is filter-coupler cellular system figure.
Embodiment
As shown in Figure 1, based on the power wire broadband carrier communication module for low pressure centralized automatic meter-reading terminal of OFDM technology, utilize OFDM technology, its structure comprises modem module, PHY unit, transmitting element, receiving element, filter-coupler unit, wherein the first signal input/output terminal of modem module and the first signal input/output end of PHY unit corresponding be connected, the signal output part of modem module is connected with the signal input part of transmitting element, the signal input part of modem module is connected with the signal output part of receiving element, transmitting element signal output part be connected with the signal input part of filter-coupler unit, the signal output part of filter-coupler unit is connected with the signal input part of receiving element, the signal input/output end of filter-coupler unit is corresponding with the signal input/output terminal of low pressure centralized automatic meter-reading terminal forceful electric power interface to be connected.
When sending signal, modem module utilizes transmitting element to amplify after communication data is modulated to Multi-channel high-frequency signal, and is loaded into line of electric force by coupling filter unit;
During Received signal strength, by the high-frequency carrier signal that other power wire broadband carrier modules be carried on line of electric force send, being input to receiving element by coupling filter unit, then entering modem module, is communication data by Multi-channel high-frequency signal receiving.
OFDM technology refer to by be divided into many orthogonal sub-channels to channel, on each of the sub-channels use a subcarrier modulate, each subcarrier and shape transmission.Like this, although total channel be non-flat forms, but every sub-channels is relatively flat, and every sub-channels is narrow band transmission, and signal bandwidth is less than the respective bandwidth of channel, can interference greatly between erasure signal waveform.Intercarrier again due to each subchannel is mutually orthogonal, so their frequency spectrum is overlapped, so both reduces inter-sub-carrier interference and turn improves the availability of frequency spectrum simultaneously.OFDM technology has the performance of stronger anti-selectivity of channel frequency decline, is the effective ways of anti-channel multi-path.As shown in Figure 2; the serial data of input is first changed through serial/parallel signal; the multichannel realizing data stream is separated; and then complete corresponding modulation by IFFT; after parallel/serial signal conversion; add guard time interval i.e. whole system signal cycle prefix, then by digital-to-analog conversion, signal is launched by up-conversion tremendously high frequency district.Receiving end carries out contrary process, and channel signal is out first through down coversion, and analog to digital conversion, then removes the Cyclic Prefix of whole system signal, then by serial/parallel signal conversion, FFT demodulation, the conversion of parallel/serial signal, reduction obtains stay of two nights sequence.
The serial ports input and output of described modem module are connected with the serial ports input and output of low pressure centralized automatic meter-reading terminal, and the RMII interface of modem module is connected with Ethernet unit.Modem module frequency bandwidth is 2M-12MHZ, adopt the DMT modulation system based on OFDM, be different from traditional OFDM modulation mode, use the signal to noise ratio (S/N ratio) of all subchannels of the instantaneous calculating of adaptive carrier algorithm, be that each channel adds load dynamically according to its result, the lower flashy noise distribution of prediction simultaneously and learn on its own electrical network interference budgetary estimate, effectively evade interference, optimize carrier-quality, and fundamentally reduce the power consumption of bandwidth carrier chip.
Described Ethernet unit uses KSZ8041 Ethernet transceiving chip, and Physical layer is connected with the light current interface of low pressure centralized automatic meter-reading terminal, and network layer RMII interface is connected with modem module.The signal realized between serial communication interface, Ethernet RMII interface and transmitting element, receiving element by modem module and Ethernet unit is changed.Because modem module has serial communication interface and Ethernet RMII interface, External digital communication can be realized connect, both are at interface and functionally separate, can use individually or simultaneously as required, achieve the self-adaptation of the communication between low pressure centralized automatic meter-reading terminal and power wire broadband carrier module, low pressure centralized automatic meter-reading terminal both can and power wire broadband carrier module between carry out communication by serial ports, also can carry out communication by Ethernet.
As shown in Figure 3, transmitting element main performance index comprises the impedance of power transmission line characteristics linearity to described transmitting element circuit diagram
, output power
, signal peak-to-average ratio is 5.33.Transmitting element mainly comprises circuit drive amplification circuit and peripheral circuit composition thereof, and use the THS6214 circuit driving amplifier of TI company, maximal power level is+14.5dBm.Differential signal inputs from the in-phase end of two amplifiers, and loop gain is determined by the ratio of resistance R2, R3 and R8.Because THS6214 uses current feedback working method, the actual gain of circuit has certain error with calculating gained, and the selection of feedback resistance also has a great impact circuit performance.Need use transformer to reduce equivalent load impedance and reduce requirement to line drive output voltage.Here elementary with the secondary turn ratio of transformer is 1:2, is therefore reflected to elementary equivalent load impedance to be
.Two resistance R5, R9 being series at amplifier out provide and the mating of elementary equivalent load impedance:
.
Described receiving element circuit diagram as shown in Figure 4, mainly comprises bandpass filter and amplitude limiter circuit.Bandpass filter only allows useful broadband carrier signal to pass through, and amplitude limiter circuit filtering external overvoltage signal, prevents external disturbance from causing damage to modem module.
Receiving element only allows useful signal to pass through, and bandpass filter is made up of five rank wave filters, and cutoff frequency is 12MHZ, and passband is 10MHZ, and impedance is
, ripple is 0.2dB.According to the L1=1065.9nH of computation of table lookup, C1=165.0pF, L2=413.3nH, C2=425.6pF, L3=1723.7nH, C3=102.1pF, L4=413.3nH, C4=425.6pF, L5=1065.9nH, C5=165.0pF.
Described filter-coupler unit as shown in Figure 5, mainly comprises filtering circuit and coupled circuit, and filter-coupler unit is used for low-voltage power line and the Signal transmissions between transmitting element and receiving element.Filter-coupler unit comprises signal transformer, Hi-pass filter, protection circuit and power line interface.Power line interface receives after signal successively by protection circuit, Hi-pass filter, signal transformer; protection circuit filtering external overvoltage signal; Hi-pass filter is to the obstruct of line of electric force 50Hz signal and broadband carrier signal can two-wayly be passed through, and transmitting element interface and receiving element interface are connected with signal transformer and carry out the transmitting-receiving of signal.
Power wire broadband carrier module for low pressure centralized automatic meter-reading terminal carries out wideband digital modulation-demodulation technique by modem module, can on line of electric force high-speed transfer digital signal, be convenient to collection signal data and processing signals data; Realized the function of protection and filtering by power line couples unit, its power line interface can support straight cutting, adopts capacitive coupling; By serial communication interface and Ethernet RMII interface, can support that multiple digital signal connects.
Claims (7)
1. based on the power wire broadband carrier communication module for low pressure centralized automatic meter-reading terminal of OFDM technology, it is characterized in that structure comprises modem module, PHY unit, transmitting element, receiving element, filter-coupler unit, wherein the first signal input/output terminal of modem module and the first signal input/output end of PHY unit corresponding be connected, the signal output part of modem module is connected with the signal input part of transmitting element, the signal input part of modem module is connected with the signal output part of receiving element, transmitting element signal output part be connected with the signal input part of filter-coupler unit, the signal output part of filter-coupler unit is connected with the signal input part of receiving element, the signal input/output end of filter-coupler unit is corresponding with the signal input/output terminal of low pressure centralized automatic meter-reading terminal forceful electric power interface to be connected.
2. the power wire broadband carrier communication module for low pressure centralized automatic meter-reading terminal based on OFDM technology according to claim 1, it is characterized in that the described network layer RMII interface be connected with modem module is connected with Ethernet unit, modem module frequency bandwidth is 2M-12MHZ.
3. the power wire broadband carrier communication module for low pressure centralized automatic meter-reading terminal based on OFDM technology according to claim 2, it is characterized in that described modem module and Ethernet unit realize serial communication interface, Ethernet RMII interface and transmitting element, signal conversion between receiving element, because modem module has serial communication interface and Ethernet RMII interface, realize External digital communication to connect, both are at interface and functionally separate, can use individually or simultaneously as required, achieve the self-adaptation of the communication between low pressure centralized automatic meter-reading terminal and power wire broadband carrier module, low pressure centralized automatic meter-reading terminal both can and power wire broadband carrier module between carry out communication by serial ports, also communication can be carried out by Ethernet.
4. the power wire broadband carrier communication module for low pressure centralized automatic meter-reading terminal based on OFDM technology according to claim 1, it is characterized in that the circuit driving amplifier in described transmitting element, maximal power level is+14.5dBm, differential signal inputs from the in-phase end of two amplifiers, and loop gain is determined by the ratio of the second resistance (R2), the 3rd resistance (R3) and the 8th resistance (R8).
5. the power wire broadband carrier communication module for low pressure centralized automatic meter-reading terminal based on OFDM technology according to claim 4, elementary with the secondary turn ratio that it is characterized in that the transformer in transmitting element is 1:2, and being reflected to elementary equivalent load impedance is
; Be series at the 5th resistance (R5) of amplifier out, the 9th resistance (R9) provides to mate with elementary equivalent load impedance and be 12.5 ohm; The power transmission line characteristics linearity impedance of transmitting element
, output power
, signal peak-to-average ratio is 5.33.
6. the power wire broadband carrier communication module for low pressure centralized automatic meter-reading terminal based on OFDM technology according to claim 1, it is characterized in that the bandpass filter in described receiving element is made up of third-order low-pass filter, cutoff frequency is 12MHZ, and passband is 10MHZ, and impedance is
, insertion loss is
.
7. the power wire broadband carrier communication module for low pressure centralized automatic meter-reading terminal based on OFDM technology according to claim 1, it is characterized in that described filter-coupler unit comprises signal transformer, Hi-pass filter, protection circuit and power line interface, wherein power line interface passes through protection circuit after receiving signal successively, Hi-pass filter, signal transformer, protection circuit filtering external overvoltage signal, Hi-pass filter is to the obstruct of line of electric force 50Hz signal and broadband carrier signal can two-wayly be passed through, transmitting element interface and receiving element interface are connected with signal transformer and carry out the transmitting-receiving of signal.
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| CN201510960023.1A CN105389968A (en) | 2015-12-21 | 2015-12-21 | Electric line broadband carrier communication module for low voltage centralization meter reading terminal |
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| CN201510960023.1A CN105389968A (en) | 2015-12-21 | 2015-12-21 | Electric line broadband carrier communication module for low voltage centralization meter reading terminal |
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Cited By (6)
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| CN106161307A (en) * | 2016-04-27 | 2016-11-23 | 熊运轩 | Use the low cost carrier communication module of chip microcontroller OOK modulation-demodulation technique |
| CN106788607A (en) * | 2017-03-21 | 2017-05-31 | 广西盛洲电力科技有限公司 | A kind of concentrator communication module based on power wire broadband carrier |
| CN107274655A (en) * | 2017-07-25 | 2017-10-20 | 南京新联电子股份有限公司 | A kind of narrowband carrier communication module for power network channel monitoring |
| CN110324067A (en) * | 2019-07-31 | 2019-10-11 | 海南电网有限责任公司 | A kind of power line communication fault detection circuit and detection device |
| CN112260978A (en) * | 2020-10-26 | 2021-01-22 | 青岛鼎信通讯股份有限公司 | Communication method between active unbalance compensation devices |
| CN112886993A (en) * | 2021-01-26 | 2021-06-01 | 中电装备山东电子有限公司 | Platform district HPLC communication device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106161307A (en) * | 2016-04-27 | 2016-11-23 | 熊运轩 | Use the low cost carrier communication module of chip microcontroller OOK modulation-demodulation technique |
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| CN112260978A (en) * | 2020-10-26 | 2021-01-22 | 青岛鼎信通讯股份有限公司 | Communication method between active unbalance compensation devices |
| CN112886993A (en) * | 2021-01-26 | 2021-06-01 | 中电装备山东电子有限公司 | Platform district HPLC communication device |
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