CN202772885U - Novel automatic communication system - Google Patents
Novel automatic communication system Download PDFInfo
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- CN202772885U CN202772885U CN 201220514282 CN201220514282U CN202772885U CN 202772885 U CN202772885 U CN 202772885U CN 201220514282 CN201220514282 CN 201220514282 CN 201220514282 U CN201220514282 U CN 201220514282U CN 202772885 U CN202772885 U CN 202772885U
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Abstract
A novel automatic communication system comprises a coupling device. One end of the coupling device is connected with a power line, the other end of the coupling device is respectively connected with a signal transmitting module and a signal receiving module, the signal transmitting module and the signal receiving module are respectively connected with a signal modulation module, the signal modulation module is connected with an MCU (micro-control unit) minimum system module, the MCU minimum system module is connected with a serial communication module, and the serial communication module is respectively connected with a PC (personal computer) and a data terminal acquisition device MTU (maximum transmission unit). After experimental test, various indexes meet design requirements, and the novel automatic communication system has the advantages of high transmission rate, high interference resistance, fine safety and the like, and has a wide practical application value in a monitoring system for automatic copy of various meter reading, user DSM (demand side management), automatic monitoring and automatic switching of load, and monitoring of power supply quality of remote users, voltage stability, interference harmonic waves and the like.
Description
Technical field
The utility model relates to a kind of communication system, especially a kind of novel automatic communication system.
Background technology
Power line carrier communication, be called for short PLC(Power Line Communication, PLC), it is a kind of wire communication mode of carrying out carrier communication with power network as channel, be coupled on the power line after valid data in the automation installation can being modulated by modulator-demodulator, then be transferred to the opposite end modulator-demodulator through power line, be transferred to the opposite end automation installation by the opposite end modulator-demodulator after with the signal demodulation again, being to utilize ultra-high-tension power transmission line to realize the multiplexing of power line and order wire as a kind of communication mode of high-frequency signal transmission channel, is the distinctive a kind of communication form of electric power system.Because power line carrier can be used for the power line transmission, spread all over city, rural area, be used for communication and do not spend to lay the transmission lines such as telephone wire, cable, optical cable, has small investment, cost is low, the transmission rate high, since the mid-90 in 20th century, realized that as signal vehicle the mode of communication has had relatively ripe and comparatively widely application abroad, has the successful case of many medium voltage electricity line carrier communications with medium voltage distribution network.Because the difference of distribution line grid structure causes more external matured products directly to use at home both at home and abroad.I am according to the characteristics of domestic distribution line grid structure, achievement in research and application with reference to external medium-voltage carrier, develop a novel automatic communication system that is suitable for medium voltage distribution network (10kV), this system comprise ARM7 microcontroller circuit, power line modulation/demodulation circuit, with the hardware designs of the interface circuit of PC, filter amplification circuit etc., simultaneously relevant application software is designed.
Summary of the invention
The utility model will solve the shortcoming of above-mentioned prior art, and a kind of novel automatic communication system is provided, and has the advantages such as transmission rate is high, antijamming capability is strong, fail safe is good.
The utility model solves the technical scheme that its technical problem adopts: this novel automatic communication system, comprise coupling device, coupling device one end connects power line, the other end connects respectively signal transmitting module and signal receiving module, signal transmitting module and signal receiving module connect respectively the signal modulation module, the signal modulation module connects the MCU minimum systematic module, and the MCU minimum systematic module connects serial communication module, and serial communication module connects respectively PC and data terminal harvester MTU.
Coupling device reaches and makes power line be used for the carrier communication purpose, adopt mutually coupled modes: this mode is that carrier equipment is connected between a phase conductor and the ground, only need fill a coupling capacitor and a trap at each Coupling point, use equipment is less, but its attenuation ratio phase-phase coupling is large.When coupling mutually earth fault occured, decay also can increase a lot.Relatively connect by one although it may be noted that coupling, actual signal transmission comprises other two-phases, is carrying out in the mode of complexity.Because the coupling ratio less expensive does not require that when line fault carrier channel has very high reliability, therefore the design adopts this mode mutually.
The MCU minimum systematic module is the core of whole communication system, is responsible for the startup of system, and data are processed, the execution of application program, and result's storage with the exchange of PC data, with the exchanges data of data terminal harvester RTU, also is the bridge of man-machine interface simultaneously.
The signal modulation module is comprised of Direct Digital Frequency Synthesizers and comparator.Become carrier signal to deliver to sending module the digital signal modulated of CPU output.
The signal demodulation module is by wave reception filtering circuit, multiplier and digital low-pass filtering the electric circuit constitute.The carrier signal of receiver module output is reduced into the A/D thief hatch that baseband wave outputs to CPU.
Sending module is comprised of optical coupling isolation circuit and power amplification circuit.Realize the power amplification of carrier signal, then receive on the power line through coupling device.
Receiver module is comprised of ceramic filter, amplifying circuit and digital filter circuit.Then realization delivers to the signal demodulation module to filtering, the amplification of carrier signal.
Serial communication module mainly is the RS232 communication interface circuit.Realize the data communication between CPU and PC, CPU and the RTU.
The effect that the utility model is useful is: the utility model medium voltage distribution carrier wave communication system provides a kind of reliable, economy, the satisfactory information channel of transmission quality for the smooth enforcement of medium-voltage distribution automation.This system has all reached designing requirement through the experiment test indices, have the advantages such as transmission rate is high, antijamming capability is strong, fail safe is good, in the monitoring system of quality of power supply, voltage stabilization, interference and the harmonic wave etc. of the automatic monitoring of automatically the copying and accepting of various souvenir readings, user's request side management (DSM), load and automatic switchover, remote subscriber, has widely actual application value.
Description of drawings
Fig. 1 is overall construction drawing of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
With reference to accompanying drawing: this novel automatic communication system, comprise coupling device, coupling device one end connects power line, the other end connects respectively signal transmitting module and signal receiving module, signal transmitting module and signal receiving module connect respectively the signal modulation module, the signal modulation module connects the MCU minimum systematic module, and the MCU minimum systematic module connects serial communication module, and serial communication module connects respectively PC and data terminal harvester MTU.
1.1 coupling device modular design
By formations such as coupling capacitor (or capacitor voltage divider), line trap, bonding apparatus and high frequency cables.
1.2MCU minimum systematic module design
We have adopted the LPC2132 processor of Philips company as the microprocessor unit of system in the design of system.LPC2132 is based on the microcontroller of 32 ARM7TDMI-S, has adopted the von Neumann structure, comes Design and implementation according to RISC principle and technology.It is with the high speed Flash memory of the embedding of 64KB.The memory interface of 128 bit widths and other special structures can be moved it under high-frequency clock.On this MCU platform, instruction set is more prone to realize than general MCU with relevant decoding mechanism.
Native system mainly utilizes the FIQ highest priority interrupt resource of himself to come the as-reduced baseband wave of timing sampling and comes the demodulation carrier data by its calculation process ability at a high speed, and 10 A/D conversion accuracy and the minimum switching rate that reaches 2.44us are enough to satisfy native system to the sampling request of baseband wave in its sheet.CPU powers with 3.3V.Crystal oscillator frequency is 18.432MHz, and capacitance is 22pF.So just can provide stable clock signal to system.
1.3 signal modulation module design
In the design of signal modulation module, the high performance frequency synthesizer AD9835 that we select ADI company to produce, its highest frequency is 50MHz, system sends into two frequency setting values to two 32 the frequency register of AD9835 first and is respectively the frequency 0 that represents binary zero and the frequency 1 that represents binary one before sending carrier signal, as long as needing only when sending carrier data according to the binary system of current transmission selects current transmission frequency 0 or the switching of 1, two frequency of frequency the PSEL0 of control AD9835 and the level state of PSEL1.Simultaneously, the signal modulation module also offers the needed coherent carrier signal of signal demodulation module coherent demodulation.
1.4 signal demodulation module design
In design, mainly adopt the multiply each other method of non-coherent demodulation of quadrature that the FSK carrier signal is carried out demodulation.Whole demodulator circuit is divided into two parts: first is that (AD835 is the Voltage-output four-quadrant multiplier that Analog Devices company produces by AD835,) multiplier circuit that consists of, two inputs of multiplier are respectively modulated transmission carrier wave and the local carriers that receives, and the signal that obtains behind the product comprises high-frequency harmonic and low frequency baseband wave.
Second portion is the bandwidth-limited circuit that is made of MAX293, MC1489 etc.The baseband wave that is through obtaining behind this part circuit send the CPU demodulation again.The MAX293 of U.S. MAXIM company Development and Production be a kind of easy to use, 8 rank low pass switching capacity filters wherein 74HCT1G00 be the NAND gate of one two input.The signal of exporting after MAX293 filtering is again through second order active low-pass filter and bivalent high-pass filter output baseband wave.
1.5 Design of serial communication module
In power-line carrier communication system, usually need the signal of needs modulation is sent to MODEM from host computer, the signal of perhaps the MODEM demodulation being finished sends it back to be analyzed in the host computer and processes, at this moment serial communication is exactly best solution, because not needing to increase too much ancillary equipment, this scheme do not finish communication task, alleviate the burden of MCU, reduced the cost of equipment.But for compatible with the computer general-purpose serial port, also need the TTL/COMS level conversion one-tenth of 3.3V and the signal of common serial port compatibility.In the design, use the RS232 serial interface communication.
1.6 signal transmitting module design
Signal transmitting module is comprised of optical coupling isolation circuit and power amplification circuit.
1.7 signal receiving module design
Signal receiving module is mainly realized filter function, and the signal amplification circuit and the bandwidth-limited circuit that are made of three grades of ceramic filters, amplifiers form.
Although the utility model illustrates and describes by the reference preferred embodiment,, those skilled in the art should understand, and in the scope of claims, can do the various variation on form and the details.
Claims (1)
1. novel automatic communication system, it is characterized in that: it comprises coupling device, coupling device one end connects power line, the other end connects respectively signal transmitting module and signal receiving module, signal transmitting module and signal receiving module connect respectively the signal modulation module, the signal modulation module connects the MCU minimum systematic module, and the MCU minimum systematic module connects serial communication module, and serial communication module connects respectively PC and data terminal harvester MTU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220514282 CN202772885U (en) | 2012-10-09 | 2012-10-09 | Novel automatic communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220514282 CN202772885U (en) | 2012-10-09 | 2012-10-09 | Novel automatic communication system |
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| Publication Number | Publication Date |
|---|---|
| CN202772885U true CN202772885U (en) | 2013-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220514282 Expired - Fee Related CN202772885U (en) | 2012-10-09 | 2012-10-09 | Novel automatic communication system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104168101A (en) * | 2014-08-28 | 2014-11-26 | 广西师范大学 | Two-way transmission system for coal mine fully mechanized mining data and control command data |
| CN112343585A (en) * | 2020-10-13 | 2021-02-09 | 中石化石油工程技术服务有限公司 | Long cable power line carrier communication system for petroleum logging |
| CN112581739A (en) * | 2015-04-17 | 2021-03-30 | 兰迪斯+ 盖尔股份有限公司 | Electricity meter and adapter module therefor |
-
2012
- 2012-10-09 CN CN 201220514282 patent/CN202772885U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104168101A (en) * | 2014-08-28 | 2014-11-26 | 广西师范大学 | Two-way transmission system for coal mine fully mechanized mining data and control command data |
| CN112581739A (en) * | 2015-04-17 | 2021-03-30 | 兰迪斯+ 盖尔股份有限公司 | Electricity meter and adapter module therefor |
| CN112581739B (en) * | 2015-04-17 | 2023-09-26 | 兰迪斯+盖尔股份有限公司 | Electricity meter and adapter module therefor |
| CN112343585A (en) * | 2020-10-13 | 2021-02-09 | 中石化石油工程技术服务有限公司 | Long cable power line carrier communication system for petroleum logging |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130306 Termination date: 20131009 |