CN102833308A - Remote monitoring system node based on power line carrier local area network - Google Patents
Remote monitoring system node based on power line carrier local area network Download PDFInfo
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- CN102833308A CN102833308A CN2012101920986A CN201210192098A CN102833308A CN 102833308 A CN102833308 A CN 102833308A CN 2012101920986 A CN2012101920986 A CN 2012101920986A CN 201210192098 A CN201210192098 A CN 201210192098A CN 102833308 A CN102833308 A CN 102833308A
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Abstract
The invention relates to a remote monitoring system node based on a power line carrier local area network. The common power line is used as a communication carrier; the local area network is constructed by a power line carrier communication technology; and the power line carrier communication technology, Ethernet communication and a sensor are integrated to form a remote monitoring system. The remote monitoring system comprises an information acquisition node, a control terminal and an upper computer. Due to the design of the remote monitoring system node, the rearrangement cost for constructing the remote monitoring network is saved; and the remote monitoring system node is particularly suitable for low-cost and low-rate remote monitoring application. Compared with a wireless networking scheme, the remote monitoring system node has the advantages of low requirement on the environment, suitability for remote monitoring under a complicated environment, reliable communication, high peer-to-peer communication distance, no extra operating cost and the like, and is a simple, economical and practical remote monitoring system.
Description
Technical field
The present invention relates to network node, especially based on the design of the long distance control system node of power line carrier local area network (LAN).
Background technology
Power carrier communication is PLC, is the abbreviation of English Power line Communication.Power carrier is the distinctive communication mode of electric power system, and power carrier communication is meant and utilizes existing power line, the analog or digital signal carried out the technology of high-speed transfer through carrier system.Maximum characteristics are not need to set up again network, as long as live wire just can carry out data passes.Since the eighties in 20th century, particularly since single-chip microcomputer and integrated revolution, this system is widely used in electric power system.It provides digitization community service and ecommerce for the user, and high-speed internet access service, voice service are provided, and can realize the control of work-at-home and remote household electrical appliance, realizes the guard monitor system of fire prevention, antitheft, anti-toxic gas leakage etc.
Abroad very early the electric line carrier communication technology is studied, many companies have released the power line carrier modem chip of oneself, and have formulated the standard of the suitable frequency range of power line carrier.Have at present to North America area power grid (480V/277V, standard frequency scope 100KHz-450KHz 208V/120Vac) and to the standard frequency scope 9KHz-150KHz of European Region electrical network (400V/230Vac).Each company to this area electrical network feature, adopts various specific proprietary technologies under the standard frequency scope, design the power line carrier modem chip of oneself.At present, there are a few money power line carrier modem chips to use in China.Spendable power line carrier modem chip of China and module can be divided frequency modulation and multifrequency or be divided into wide-band modulation and narrowband modulation.
The application of power line carrier at present is mainly in application such as family broadband power cat.Adopt the wide-band modulation chip, can realize the unification of family's broadband socket and electric power socket in conjunction with the OFDM modulation technique, cover the blind area of wireless WLAN, carrier communication has obtained better development on the big bandwidth applications of short distance.Comprise microcontroller on the broadband power cat structure, broadband power line carrier chip and analog interface.The modulated chip of numeral ethernet signal is loaded on the power line and transmits; Receiving terminal filters out digital ethernet signal from demodulation through the power carrier signal of ovennodulation again; Thereby realize that home computer carries out network communication through house wire, cooperate home router to realize the function of online again.
Long distance control system adopts comparatively ripe cable network to realize each internodal communication and networking of guarded region usually, and lower deployment cost is bigger, and disposes the node relative fixed.Can realize remote monitoring through http server or video server after the guarded region networking.Along with the rise of Internet of Things, wireless sense network requires to have obtained fine application in the low monitor network to data volume at some.Such as on each node, installing, make the detection data in real time of node be connected into the Internet, thereby realize long-range monitoring through the GPRS signal through the GPRS module.
Traditional long distance control system adopts proprietary cable network to implement the transmission or the networking of signal usually; Lower deployment cost is high, and vast medium-sized and small enterprises can't bear, and has a big chunk to need not big bandwidth in the remote monitoring application; The low application of data volume is (like farming and animal husbandry; Mineral products, public service etc.), the deployment threshold of traditional long distance control system is too high.Though wireless sense network well provides low rate communication networking function in the Internet of Things, the wireless signal reliability is low, influenced greatly by environmental change, and the signal penetration capacity is low, often need dispose a large amount of via nodes, has improved cost.And, also improved the operation cost of whole system owing to the data traffic expense of wireless Internet.
Summary of the invention
In order to solve the problem that existing long distance control system exists, the present invention provides a kind of design of the long distance control system node based on the power line carrier local area network (LAN).It just is being based on monitor node this brass tacks of need supplying power; Adopt power line carrier technology to realize the design of data communication and electric power supply unification, both saved the high cost that redeploys proprietary network, realize the wire communication of communication signal again; Improved the reliability of communication; And do not have extra running cost, greatly reduced the lower deployment cost of system, for long distance control system provides solution in the extensive use of all trades and professions.
For reaching above purpose; The technical solution adopted for the present invention to solve the technical problems is: use ubiquitous electric wire as the communication carrier; Adopt electric line carrier communication technology constructing local network, and with the synthetic long distance control system of electric line carrier communication technology, ethernet communication and set of sensors.Long distance control system comprises information gathering node, control terminal, host computer.Control terminal has power line (PLC) ability to communicate simultaneously, can carry out the communication of environmental information with subordinate's acquisition node.Acquisition node is the embedded device with power line communication ability, can carry additionally different sensor according to the difference of applied environment, and acquisition node can adopt the design identical with Control Node, and shielding ethernet communication port gets final product during application.The modularized design of control terminal hardware using is by the ARM embedded microprocessor, the power line carrier module, and the temperature and humidity sensing module is formed.Control terminal remote environment Data Acquisition can be accomplished through the communication of the WEB server that moves on the Control Node and remote server.Long distance control system can the runtime server program, can realize the direct visit of terminal, also can with the remote server swap data, realize uploading automatically of monitor data.
After adopting above technical scheme, the invention has the beneficial effects as follows: saved the rewiring expense of setting up remote control network, be particularly suitable for low cost, the remote monitoring of low rate is used.With respect to the wireless networking scheme, have environmental requirement lowly, be suitable for for the remote monitoring under the complex environment, communication is reliable, and point-to-point communication is apart from height, and do not have advantage such as any extra operation cost, is a kind of simple, economic, practical long distance control system.
Description of drawings
Below in conjunction with accompanying drawing the present invention is done further description.
Fig. 1 is the structural representation of long distance control system of the present invention.
Fig. 2 is hardware circuit design figure of the present invention.
Fig. 3 is the main flow chart of PLC communication subfunction of the present invention.
Embodiment
According to shown in Figure 1; A kind of long distance control system node of the present invention based on the power line carrier local area network (LAN); By the environmental information acquisition node, control terminal, host computer (or remote server) constitutes; Be that a kind of electric line carrier communication is applied to set up local area network, and with the long distance control system equipment of itself and ethernet communication and set of sensors one.
The carrier of local area network (LAN) according to the invention is existing power line.The communication contact of each several part is realized as follows: control terminal has the Ethernet access function; Operation uIP Web server on control terminal; Be connected into host computer through ethernet line and carry out transfer of data, can realize monitoring through the IP address of browser access control terminal at host computer to home environment; Or regularly send environmental data to remote server, make things convenient for control personnel remote monitoring environment.Control terminal has power line (PLC) ability to communicate simultaneously, can carry out the communication of environmental information with subordinate's acquisition node; Said acquisition node is the embedded device with power line communication ability, can carry additionally different sensor according to the difference of applied environment.Acquisition node can adopt the design identical with Control Node, and shielding ethernet communication port gets final product during application.Control terminal relates to the combination of software and hardware in the whole system, is the major part of whole system work, adopts modularized design.Said modularized design is by the ARM embedded microprocessor, the power line carrier module, and the temperature and humidity sensing module is formed.Said control terminal software is that the remote environment Data Acquisition can be accomplished through the communication of the WEB server that moves on the Control Node and remote server.But this system runtime server program realizes the direct visit of terminal or uploads perhaps its combination in any, perhaps its set automatically with the remote server swap data is realized monitor data.Said control terminal has power line (PLC) ability to communicate simultaneously, can carry out the communication of environmental information with subordinate's acquisition node.
The hardware designs of control terminal of the present invention:
Control terminal is the key of whole system work, is the tie of local sensing net of contact and internet.The task at this terminal is:
(a) accomplish signal transmission and control through the power line transmission module, obtain each environmental parameter of acquisition node, be uploaded to remote computer acquisition node;
(b) operation of management Web Server is accepted the order of remote computer and is returned real time data;
(c) monitor the ruuning situation of sensing network under this terminal.
Modularized design is adopted at this terminal, mainly is by the ARM embedded microprocessor, power line carrier module, compositions such as temperature and humidity sensing module.Specific as follows:
A. embedded system control module.The design adopts the lm3s6965 main control chip of the Stellaris of TIX 6000 series based on ARM Cortex-M3, adopts the encapsulation of 100 pin, core work frequency 50MHz; Support 256kB flash memory and 64kB SRAM; Built-in 10/100 ethernet mac/PHY, SSI/SPI EBI, 2 road I2C buses; 3 road UART serial ports, 10 A/D converters of 4 passage high accuracy;
B. power line carrier module.The design adopts the low rate of STMicw Electronics, frequency shift keying power carrier chip ST7540 chip, and it adopts littler than ST7538 size; Pin count 28 pin encapsulation still less, integrated single-ended power amplifier has the input-output line that can insert; Ability external filters network; Excellent linear power performance is provided, bigger design flexibility is provided, reduced parts number and the cost used.The inner integrated all functions of sending and accept data of ST7540 can link to each other with microcontroller through serial communication easily.Inside has voltage, and electric current is controlled controlled function automatically, if through coupling transformer etc. seldom device just can be directly connected on the power line;
C. humiture one body sensor (select for use, can require be equipped with other transducers) according to breeding environment.The design adopts SHT11 humiture one body sensor of Switzerland Sensirion company, adopts the I2C EBI to link to each other with master controller.Temperature measurement range :-40～+ 123.8 ℃, moisture measurement scope: 0～100%RH has high accuracy, and response is rapid, and interference resistance is strong, characteristics such as cost performance height.
Hardware circuit mainly is divided into 3 parts among the present invention: power unit, microcontroller and digital module, PLC Power Line Carrier Communication Module and filter network.
Power module: the 220V alternating current be the plc communication carrier also be the design's power supply.Microcontroller is 3.3V direct current supply among the design, and ST7540 is 12V direct current supply.The 220V alternating current is reduced to 15V through transformer earlier, is the 15V direct current through the rectifier bridge rectification again, is that ST7540 provides stable 12V DC power supply through the LM7812 voltage-stabiliser tube then.Because pressure drop is bigger between the 12V to 3.3V, is unfavorable for that AMS1117-3V3 works long hours, increased transstage 5V voltage stabilizing output among the design.The power supply design power is 5W.
Microcontroller and digital module: microcontroller lm3s6965 uses the I2C bus to link to each other with transducer, and the DATA data wire in the I2C bus needs pull-up resistor to guarantee the true(-)running of I2C bus protocol.Adopt the UART asynchronous serial port with the communication of carrier chip ST7540, the communication sequential is set by microcontroller, has reduced the sequence problem that synchronous transmission possibly brought.The carrier signal (CD/LP) of reaction carrier case links to each other with the GPIO mouth of temperature alarm (BU/THERM) respectively at microcontroller.The RxTx signal is the read-write control signal of carrier chip.Inner integrated 10/100 ethernet mac of microcontroller and PHY layer and LED display control signal, input and output output on the RJ45 interface with differential signal.
It is the power supply of internal digital module and power amplifier module simultaneously that PLC Power Line Carrier Communication Module and filter network: ST7540 adopts the 12V single supply, adopts 3.3V digital circuit interface voltage, and need not level conversion can directly link to each other with microcontroller.With the communication mode of master controller be UART asynchronous serial port pattern; Bit rate 2400; The power line carrier communication centre frequency is 132.5kHz, and modulating mode is frequency shift keying (FSK), and the actual transmissions frequency of numerical value " 0 " and " 1 " is 131836Hz and 133138Hz.The inner power amplifier output voltage of ST7540 maximum peak peak value 7.5V, maximum output current 500mArms.The sendaisle filter comprises initiatively and passive two parts.Active filters is made up of a simple R C low-pass network (cut-off frequency is 197.7kHz) and a second-order low-pass filter (cut-off frequency is 203.6kHz), and for 2 times of carrier signal, 3 subharmonic have filtration preferably.Passive filter is made up of decoupling capacitance and inductance.The use of coupling transformer both can realize that strong and weak electricity separates, and helped the impedance matching of power line load again.Accepting path filter is made up of a resistance series LC parallel resonator.Centre frequency is 130.1kHz, and quality factor q is 2.6.
Obtaining of medium-long range environmental data of the present invention can be accomplished through the communication of the WEB server that moves on the Control Node and remote server.This WEB server adopts the uIP protocol stack.The uIP protocol stack is a kind of free minimum ICP/IP protocol stack, uses the C language, has removed the function that is of little use in the global function ICP/IP protocol stack; Keep the necessary protocol of network service; Significantly reduced the protocol code amount, reduced the requirement of agreement to system resource, the size of code of uIP is about several kilobytes; But only need the just trouble-free operation of internal memory of hundreds of byte, be fit to the application in the embedded system.
The main program of Control Node adopts the mode of interrupting adding repeating query, accepts acquisition node through the data that power line transmits with the mode of down trigger, has been arranged one to receive temporary these data of formation.Repeating query has or not the network packet input in program, if any the relevant treatment function that then calls uIP; Do not interrupt whether taking place as there being then detection timing repeating query.Regularly report local node institute's Information Monitoring and write the remote server data storehouse to remote server.
All environmental informations are gathered child node and after powering on, all are in the wait receive status.Owing to share the power line bus; Control Node Frame information will be accepted by all child nodes; Have only the child node with the ID bytes match can withdraw from accepting state, call corresponding temperature or humidity reads subprogram, obtain current child node environmental parameter according to the content of command byte.ST7540 gets into sending mode self ID and environmental parameter is sent it back control terminal on the child node then, and child node got into the wait receive status again after transmission was accomplished, and avoided a plurality of child nodes to take the power line bus simultaneously.
Claims (9)
1. long distance control system node based on the power line carrier local area network (LAN); It is characterized in that: said long distance control system comprises information gathering node, control terminal, host computer; Be that a kind of electric line carrier communication is applied to set up local area network, and with the long distance control system equipment of itself and ethernet communication and set of sensors one.
2. a kind of long distance control system node based on the power line carrier local area network (LAN) according to claim 1, it is characterized in that: the carrier of said local area network (LAN) is existing power line.
3. a kind of long distance control system node according to claim 1 based on the power line carrier local area network (LAN); It is characterized in that: said control terminal has the Ethernet access function; On control terminal, move uIP Web server, be connected into host computer through ethernet line and carry out transfer of data.
4. a kind of long distance control system node according to claim 1 based on the power line carrier local area network (LAN); It is characterized in that: said acquisition node is the embedded device with power line communication ability; Can carry additionally different sensor according to the difference of applied environment; Acquisition node can adopt the design identical with Control Node, and shielding ethernet communication port gets final product during application.
5. a kind of long distance control system node based on the power line carrier local area network (LAN) according to claim 1, it is characterized in that: said control terminal comprises hardware and software, adopts modularized design.
6. a kind of long distance control system node according to claim 5 based on the power line carrier local area network (LAN), it is characterized in that: said modularized design is by the ARM embedded microprocessor, the power line carrier module, the temperature and humidity sensing module is formed.
7. according to claim 1,5 described a kind of long distance control system nodes based on the power line carrier local area network (LAN), it is characterized in that: said control terminal software is that the remote environment Data Acquisition can be accomplished through the communication of the WEB server that moves on the Control Node and remote server.
8. a kind of long distance control system node according to claim 1 based on the power line carrier local area network (LAN); It is characterized in that: but this system's runtime server program realizes the direct visit of terminal or realizes uploading automatically of monitor data with the remote server swap data; Perhaps its combination in any, perhaps its set.
9. according to claim 1,5 described a kind of long distance control system nodes based on the power line carrier local area network (LAN), it is characterized in that: said control terminal has power line (PLC) ability to communicate simultaneously, can carry out the communication of environmental information with subordinate's acquisition node.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607220A (en) * | 2013-11-20 | 2014-02-26 | 无锡汉兴电子有限公司 | Monitoring device having electric power communication function |
| CN103630168A (en) * | 2013-12-05 | 2014-03-12 | 青岛海尔软件有限公司 | Power line carrier communication based temperature and humidity acquisition system |
| CN103701497A (en) * | 2013-12-26 | 2014-04-02 | 杭州电子科技大学 | Deck unit circuit of AC (Alternating Current) 500v power line carrier shipborne remote communication system |
| CN103731183A (en) * | 2013-12-26 | 2014-04-16 | 杭州电子科技大学 | Underwater unit circuit of shipborne remote communication system based on alternating-current 500v power line carrier |
| CN104678964A (en) * | 2015-02-04 | 2015-06-03 | 南京工程学院 | Intelligent garage monitoring device based on Zigbee |
| CN105187095A (en) * | 2015-09-02 | 2015-12-23 | 中山市库尔光电技术有限公司 | PLC network transmitter |
| CN106303445A (en) * | 2016-08-28 | 2017-01-04 | 桂林力拓信息科技有限公司 | Museum's safety monitoring system of electrically-based line carrier communication |
| CN107896120A (en) * | 2017-11-10 | 2018-04-10 | 珠海格力电器股份有限公司 | A kind of environmental information automatic monitoring method and system |
| CN109450514A (en) * | 2018-11-15 | 2019-03-08 | 国网浙江宁波市鄞州区供电有限公司 | A kind of mobile communication relay based on low pressure carrier wave |
| CN110365107A (en) * | 2018-12-25 | 2019-10-22 | 深圳市联强邦盛实业有限公司 | A kind of distributed terminator monitoring system |
| CN110687368A (en) * | 2019-07-16 | 2020-01-14 | 深圳智微电子科技有限公司 | OFDM carrier signal-based transformer state online monitoring system and method |
| CN111585837A (en) * | 2020-04-28 | 2020-08-25 | 实地地产集团有限公司 | Internet of things data link monitoring method and device, computer equipment and storage medium |
| CN115001535A (en) * | 2022-05-27 | 2022-09-02 | 湖南省滚石智能科技有限公司 | Power line carrier transmission module |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607220A (en) * | 2013-11-20 | 2014-02-26 | 无锡汉兴电子有限公司 | Monitoring device having electric power communication function |
| CN103630168A (en) * | 2013-12-05 | 2014-03-12 | 青岛海尔软件有限公司 | Power line carrier communication based temperature and humidity acquisition system |
| CN103701497A (en) * | 2013-12-26 | 2014-04-02 | 杭州电子科技大学 | Deck unit circuit of AC (Alternating Current) 500v power line carrier shipborne remote communication system |
| CN103731183A (en) * | 2013-12-26 | 2014-04-16 | 杭州电子科技大学 | Underwater unit circuit of shipborne remote communication system based on alternating-current 500v power line carrier |
| CN103731183B (en) * | 2013-12-26 | 2015-05-27 | 杭州电子科技大学 | Underwater unit circuit of shipborne remote communication system based on alternating-current 500v power line carrier |
| CN104678964A (en) * | 2015-02-04 | 2015-06-03 | 南京工程学院 | Intelligent garage monitoring device based on Zigbee |
| CN105187095A (en) * | 2015-09-02 | 2015-12-23 | 中山市库尔光电技术有限公司 | PLC network transmitter |
| CN106303445A (en) * | 2016-08-28 | 2017-01-04 | 桂林力拓信息科技有限公司 | Museum's safety monitoring system of electrically-based line carrier communication |
| CN107896120A (en) * | 2017-11-10 | 2018-04-10 | 珠海格力电器股份有限公司 | A kind of environmental information automatic monitoring method and system |
| CN109450514A (en) * | 2018-11-15 | 2019-03-08 | 国网浙江宁波市鄞州区供电有限公司 | A kind of mobile communication relay based on low pressure carrier wave |
| CN110365107A (en) * | 2018-12-25 | 2019-10-22 | 深圳市联强邦盛实业有限公司 | A kind of distributed terminator monitoring system |
| CN110687368A (en) * | 2019-07-16 | 2020-01-14 | 深圳智微电子科技有限公司 | OFDM carrier signal-based transformer state online monitoring system and method |
| CN110687368B (en) * | 2019-07-16 | 2022-03-25 | 深圳智微电子科技有限公司 | OFDM carrier signal-based transformer state online monitoring method |
| CN111585837A (en) * | 2020-04-28 | 2020-08-25 | 实地地产集团有限公司 | Internet of things data link monitoring method and device, computer equipment and storage medium |
| CN111585837B (en) * | 2020-04-28 | 2022-04-08 | 实地地产集团有限公司 | Internet of things data link monitoring method and device, computer equipment and storage medium |
| CN115001535A (en) * | 2022-05-27 | 2022-09-02 | 湖南省滚石智能科技有限公司 | Power line carrier transmission module |
| CN115001535B (en) * | 2022-05-27 | 2023-10-20 | 湖南省滚石智能科技有限公司 | Power line carrier transmission module |
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Application publication date: 20121219 |