CN105915267A - Power line carrier device for measurement and control system and control method thereof - Google Patents
Power line carrier device for measurement and control system and control method thereof Download PDFInfo
- Publication number
- CN105915267A CN105915267A CN201610232940.2A CN201610232940A CN105915267A CN 105915267 A CN105915267 A CN 105915267A CN 201610232940 A CN201610232940 A CN 201610232940A CN 105915267 A CN105915267 A CN 105915267A
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- China
- Prior art keywords
- module
- control
- coupling
- signal
- power line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/546—Combination of signalling, telemetering, protection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
Abstract
The invention discloses a power line carrier device for a measurement and control system and a control method thereof. The power line carrier device is composed of a control chip, a modem and a coupling circuit; and the control chip and the modem are connected by a lead. A digital signal output terminal of the modem is connected with a D/A module by a lead; the D/A module and a sending filtering module are connected by a lead; the sending filtering module and a sending amplification circuit are connected by a lead; and the sending amplification circuit and the coupling circuit are connected by a lead. A digital signal input terminal of the modem is connected with an A/D module by a lead; the A/D module and a receiving filtering module are connected by a lead; the receiving filtering module and a receiving amplification circuit are connected by a lead; the receiving amplification circuit and the coupling circuit are connected by a lead; and the coupling circuit and a power line are connected. Therefore, problems of high interference, poor stability, short transmission distance, large influence by a load, and poor reliability because of application a low-voltage power line carrier to a measurement and control system in the prior art can be solved.
Description
Technical field
The invention belongs to carrier communication, particularly relate to a kind of electric carrier apparatus for TT&C system and control thereof
Method.
Background technology
Low-voltage powerline carrier communication PLC(Power Line Communication) refer to utilize existing low-voltage distribution
Net, as transmission medium, realizes data transmission and a kind of technology of information exchange.From the power line carrier communication twenties in 20th century
Since release, PLC is effectively applied to power system by maturation, security protection controls, Street lamps control, kilowatt meter reading-out system etc. are many
Field.It is good that it has channel reliability, and survivability is strong, small investment, it is not necessary to set up the advantages such as special circuit and by extensively
Application.
As an application of the communication technology, prior art is the most substantial amounts of has used PLC technology, due to
Its practicality and huge market prospects, tried to be the first employing by each company rapidly.It utilizes existing AC power cord conduct
Communication line, eliminates unpractical paving lineman's journey, with the obvious advantage.Power-line carrier communication is applied to TT&C system
In, the communication mode of a kind of novel low cost is provided for industrial processes system and important living facilities system, but
In TT&C system there is the problems such as strong, the poor stability of interference in data transmission, there is transmission range and falls short of, by load effect
Big and that reliability is not high enough problem.
Summary of the invention
The technical problem to be solved in the present invention: a kind of electric carrier apparatus for TT&C system and controlling party thereof are provided
Method, uses and has in TT&C system that interference is strong, poor stability solving the low voltage power line carrier of prior art, there is biography
The problems such as defeated distance falls short of, and reliability big by load effect is the highest.
Technical solution of the present invention:
A kind of electric carrier apparatus for TT&C system, it includes control chip, modem and coupling circuit, controls core
Sheet is connected with modem wire, and modem digital signal output end is connected with D/A module wire, D/A module with send out
Send filtration module wire to connect, send filtration module and be connected with sending amplifying circuit wire, send amplifying circuit and couple circuit
Wire connects；Modem digital signal input end is connected with A/D module wire, and A/D module connects with the module wire that accepts filter
Connecing, the module that accepts filter is connected with receiving amplifying circuit wire, receives amplifying circuit and is connected with coupling circuit lead.Coupling circuit
It is connected with power line.
Described coupling circuit includes coupling transformer T1 and coupling electric capacity C51, coupling transformer T1 and couples electric capacity C51 even
Connect, be parallel with moment suppression diode TVS2 at the outlet side two ends of coupling transformer T1, in the power line side of coupling circuit
It is parallel with transient supression diode TVS3.
Described modem is digital adjustment demodulator, and it uses FPGA to constitute, and its model is EP2C5T144C8.
Described control chip is AVR control chip, and its model is ATmega16.
D/A module chip uses the AD9764 of AD company to constitute；A/D module chip uses the TLC5510 of TI company to constitute,
And it is parallel with shunt capacitance at the power supply end of TLC5510 chip.
The module that accepts filter and transmission filtration module use low pass filter.
Sending amplifying circuit uses AD8009 to constitute, and receives amplifying circuit and uses OPA690 to constitute.
AccessPort interface, LED light and button it is integrated with on control chip.
The control method of described electric carrier apparatus, it include data send control, it comprises the steps:
Step 1, control chip receive the level signal from external key, generate order control frame in control chip, and will
The data segment sending order control frame sends into the transmission process carrying out signal in adjustment demodulator；
Step 2, be adjusted demodulator processes after digital carrier signal first pass around D/A conversion, generate analog carrier signal；
In order to filter the high-frequency harmonic composition of waveform in analog carrier signal, after D/A changes, carry out LPF, then by sending out
Sending amplifying circuit and coupling circuit to upload on power line by carrier signal, the transmission completing carrier signal controls.
The control method of described electric carrier apparatus, it includes data receiver control, and it comprises the steps:
Step 1, receive carrier signal time, coupling circuit download carrier signal from power line channel；
Step 2, the module that accepts filter filter the clutter in carrier signal, send in A/D module and are converted to digital carrier signal；
After step 3, digital carrier signal are demodulated in adjusting demodulator, restore the data signal of transmitting terminal, send into control
Coremaking sheet determines whether the order of this node control；
Step 4, it is that the order of this node control then processes.
Beneficial effects of the present invention:
The present invention is capable of being applied in TT&C system power-line carrier communication, for industrial processes system and weight
Living facilities system is wanted to provide a kind of novel low cost, convenience, reliable electric carrier apparatus.The present invention is suitable for observing and controlling system
System power line carrier data transmission, by the present invention improve power line carrier, PLC measuring and control data transmit in reliability,
Real-time and stability.The communication module of present invention design can in conventional industrial environment steady operation, it is possible to scene
Industrial data be sent to measurement and control host computer the most reliably by power line carrier communication mode, simultaneously can be accurately and real-time
Various control commands are sent to each on-the-spot execution node by power line carrier communication mode.
Present invention reduces engineering cost and the engineering difficulty of TT&C system, make the accuracy of TT&C system, practicality, warp
Ji property and flexibility are greatly increased, and for improving the quality of production, saving energy and reduce the cost provides condition；Solve the low tension of prior art
Line of force carrier wave is used and is had in TT&C system that interference is strong, poor stability, also exist transmission range fall short of, big by load effect
With the problem such as reliability is the highest.
Accompanying drawing illustrates:
Fig. 1 is apparatus of the present invention structural representation；
Fig. 2 is coupled circuit configuration schematic diagram of the present invention.
Detailed description of the invention:
A kind of electric carrier apparatus for TT&C system, it includes control chip, modem and coupling circuit, controls core
Sheet is connected with modem wire, and modem digital signal output end is connected with D/A module wire, D/A module with send out
Send filtration module wire to connect, send filtration module and be connected with sending amplifying circuit wire, send amplifying circuit and couple circuit
Wire connects；Modem digital signal input end is connected with A/D module wire, and A/D module connects with the module wire that accepts filter
Connecing, the module that accepts filter is connected with receiving amplifying circuit wire, receives amplifying circuit and is connected with coupling circuit lead.Coupling circuit
It is connected with power line.
Described coupling circuit includes coupling transformer T1 and coupling electric capacity C51, coupling transformer T1 and couples electric capacity C51 even
Connect, be parallel with moment suppression diode TVS2 at the outlet side two ends of coupling transformer T1, in the power line side of coupling circuit
It is parallel with transient supression diode TVS3.
Moment suppression diode TVS2 is mainly voltage surge impact in absorbing circuit, and circuit is played protective effect.
Access and the disconnection of electric power built-in unit all may produce spike or instantaneous overvoltage, so accessing electricity
The overvoltage protection of line of force one end is the most necessary, the most easily burns out circuit, uses transient supression diode in the present invention
Overvoltage from power line one end is eliminated by TVS3, protects circuit.
Described modem is digital adjustment demodulator, and it uses FPGA to constitute, and its model is EP2C5T144C8.
The present invention use fpga chip EP2C5T144C8 as carrier communication modem, primarily to solve adjust
The capacity of whole demodulator and performance issue, the CycloneII type FPGA core of altera corp's low cost series 90nm technology
Sheet EP2C5T144C8, is a fpga chip that cost performance is the highest in the market.4608 logical blocks are had to be equivalent to 23
Ten thousand gates, 119808 bit memory, 2 phaselocked loops, 13 hardware multiplier modules, 26 embedded units, Mei Gedan
Unit 4kbit, and support the configuration modes such as JTAG, AS, PS.This chip uses as adjustment demodulator be applicable to the present invention.
The control chip of system be use one piece of AVR control chip realize, due to AVR chip performance indications need and
Adjust the fpga chip coupling of demodulator, be 3.3V owing to the present invention adjusting the I/O voltage of demodulator fpga chip, therefore originally
Invention needs to select the AVR chip of 3.3V powering mode, owing to needs design external key in peripheral circuit, so AVR core
The selection of the I/O quantity of sheet is also the key of the present invention, is secondly exactly the big of its internal timer number and program storage
The little needs that whether can meet power carrier.Comprehensive considerations above, the present invention selects the ATmega16 in AVR controller, as
Control chip, it is the 8-bit microprocessor of a kind of high-performance, low-power consumption, and work clock is up to the system of 16MIPS, 16K byte
In Flash able to programme, the on-chip SRAM of EEPROM, 1K byte of 512 bytes, two 8 bit timing devices/counters, there is independence
Comparator and pre-divider function, a 16 bit timing devices/counter, have pre-divider catch and comparing function.Have
Battery saving mode function, the TQFP encapsulation of 44 pins, 32 programmable I/O mouths, when 1MHZ, 3V, 25oC, normal power consumption is only
1.1mA。
According to the needs of carrier communication, D/A and A/D module is the important device of signal conversion in carrier communication modulation /demodulation
Part, the present invention selects the AD9764 of AD company as D/A conversion chip, selects the TLC5510 of TI company to change core as A/D
Sheet.Owing to the switching rate of AD9764 is the highest be 105MSPS, TLC5510 switching rate be 20MSPS, its sample rate is entirely capable of
Meet the needs of observing and controlling carrier communication system.
In signal modulation sends, the importance of D/A module is only second to FGPA, AD9764 is high-speed d/a converter, is one
Individual can compatible 8,10,12, the D/A converter of 14, be particularly well-suited to the transmission of communication system.Owing to being poor
Divide electric current output, it is therefore desirable to use operational amplifier that current signal is converted to voltage signal.Therefore the present invention uses at a high speed
Low distortion amplifier AD8009 is as sending amplifying circuit, and reduces interference by the mode of large area paving copper ground connection, improves D/A and turns
The reliability changed.
In the demodulating process receiving signal, A/D module is important device, and under regular situation, A/D module figure place is more
Height, can obtain the signal to noise ratio that comparison is high, but when the signal to noise ratio of A/D module is higher than the signal to noise ratio of input signal, the highest position
Number is without practical significance, and A/D module is made an uproar and calculated than by following formula
SNR=6.02n+1.76dB+10lg[fs/2B]
Wherein, fs is sample frequency, and B is A/D module bandwidth, and n is that A/D module changes figure place；
The present invention considers when input carrier signal is less, is easily subject to digital display circuit interference, at power supply end in parallel
The mode of shunt capacitance improves A/D module stability, reduces the interference of digital display circuit, improves the anti-interference energy of whole device
Power, increases data transmission credibility and the stability of device.
During practical communication, the intensity of carrier signal is always in change, in order to reach optimal A/D module samples
Effect, carrier signal is mated before signal enters A/D module by the present invention, uses OPA690 operation amplifier in the present invention
Device mates with A/D module as receiving amplifying circuit, and OPA690 constitutes Voltage Feedback amplifier, has signal stabilization gain very
Big effect.
The module that accepts filter and transmission filtration module use low pass filter.
AccessPort interface, LED light and button it is integrated with on control chip.
The control method of described electric carrier apparatus, it include data send control, it comprises the steps:
Step 1, control chip receive the level signal from external key, generate order control frame in control chip, and will
The data segment sending order control frame sends into the transmission process carrying out signal in adjustment demodulator；
Step 2, be adjusted demodulator processes after digital carrier signal first pass around D/A conversion, generate analog carrier signal；
In order to filter the high-frequency harmonic composition of waveform in analog carrier signal, after D/A changes, carry out LPF, then by sending out
Sending amplifying circuit and coupling circuit to upload on power line by carrier signal, the transmission completing carrier signal controls.
The control method of described electric carrier apparatus, it includes data receiver control, and it comprises the steps:
Step 1, receive carrier signal time, coupling circuit download carrier signal from power line channel；
Step 2, the module that accepts filter filter the clutter in carrier signal, send in A/D module and are converted to digital carrier signal；
After step 3, digital carrier signal are demodulated in adjusting demodulator, restore the data signal of transmitting terminal, send into control
Coremaking sheet determines whether the order of this node control；
Step 4, it is that the order of this node control then processes.
Claims (10)
1. for an electric carrier apparatus for TT&C system, it includes control chip, modem and coupling circuit, and it is special
Levying and be: control chip is connected with modem wire, modem digital signal output end is with D/A module wire even
Connecing, D/A module is connected with sending filtration module wire, sends filtration module and is connected with sending amplifying circuit wire, sends and amplify
Circuit is connected with coupling circuit lead；Modem digital signal input end is connected with A/D module wire, A/D module and reception
Filtration module wire connects, and the module that accepts filter is connected with receiving amplifying circuit wire, receives amplifying circuit and leads with coupling circuit
Line connects, and coupling circuit is connected with power line.
A kind of electric carrier apparatus for TT&C system the most according to claim 1, it is characterised in that: described coupling electricity
Road includes that coupling transformer T1 and coupling electric capacity C51, coupling transformer T1 are connected, at coupling transformer T1 with coupling electric capacity C51
Outlet side two ends be parallel with moment suppression diode TVS2, coupling circuit power line side be parallel with transient supression two pole
Pipe TVS3.
A kind of electric carrier apparatus for TT&C system the most according to claim 1, it is characterised in that: described modulatedemodulate
Adjusting device is digital adjustment demodulator, and it uses FPGA to constitute, and its model is EP2C5T144C8.
A kind of electric carrier apparatus for TT&C system the most according to claim 1, it is characterised in that: described control core
Sheet is AVR control chip, and its model is ATmega16.
A kind of electric carrier apparatus for TT&C system the most according to claim 1, it is characterised in that: D/A module core
Sheet uses the AD9764 of AD company to constitute；A/D module chip uses the TLC5510 of TI company to constitute, and at TLC5510 chip
Power supply end is parallel with shunt capacitance.
A kind of electric carrier apparatus for TT&C system the most according to claim 1, it is characterised in that: accept filter mould
Block and transmission filtration module use low pass filter.
A kind of electric carrier apparatus for TT&C system the most according to claim 1, it is characterised in that: send and amplify electricity
Road uses AD8009 to constitute, and receives amplifying circuit and uses OPA690 to constitute.
A kind of electric carrier apparatus for TT&C system the most according to claim 1, it is characterised in that: on control chip
It is integrated with AccessPort interface, LED light and button.
9. the control method of the electric carrier apparatus as described in claim 1-8, it include data send control, it includes following
Step:
Step 1, control chip receive the level signal from external key, generate order control frame in control chip, and will
The data segment sending order control frame sends into the transmission process carrying out signal in adjustment demodulator；
Step 2, be adjusted demodulator processes after digital carrier signal first pass around D/A conversion, generate analog carrier signal；
In order to filter the high-frequency harmonic composition of waveform in analog carrier signal, after D/A changes, carry out LPF, then by sending out
Sending amplifying circuit and coupling circuit to upload on power line by carrier signal, the transmission completing carrier signal controls.
10. the control method of the electric carrier apparatus as described in claim 1-8, it includes data receiver control, under it includes
State step:
Step 1, receive carrier signal time, coupling circuit download carrier signal from power line channel；
Step 2, the module that accepts filter filter the clutter in carrier signal, send in A/D module and are converted to digital carrier signal；
After step 3, digital carrier signal are demodulated in adjusting demodulator, restore the data signal of transmitting terminal, send into control
Coremaking sheet determines whether the order of this node control；
Step 4, it is that the order of this node control then processes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610232940.2A CN105915267A (en) | 2016-04-15 | 2016-04-15 | Power line carrier device for measurement and control system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610232940.2A CN105915267A (en) | 2016-04-15 | 2016-04-15 | Power line carrier device for measurement and control system and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105915267A true CN105915267A (en) | 2016-08-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610232940.2A Pending CN105915267A (en) | 2016-04-15 | 2016-04-15 | Power line carrier device for measurement and control system and control method thereof |
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| CN (1) | CN105915267A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245514A (en) * | 2018-08-07 | 2019-01-18 | 河北九英电气设备有限公司 | Intelligence In Baogang Kindergarten ultraviolet sterilization system |
| CN112420345A (en) * | 2020-11-11 | 2021-02-26 | 广东电网有限责任公司 | Power transformer and power supply system |
| CN115833963A (en) * | 2022-10-18 | 2023-03-21 | 广西电网有限责任公司钦州供电局 | Batch detection platform for communication modules of electric energy meters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115833963A (en) * | 2022-10-18 | 2023-03-21 | 广西电网有限责任公司钦州供电局 | Batch detection platform for communication modules of electric energy meters |
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Application publication date: 20160831 |
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