CN108288371A - Based on the time-multiplexed electric flux synchronous sampling system of bus - Google Patents
Based on the time-multiplexed electric flux synchronous sampling system of bus Download PDFInfo
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- CN108288371A CN108288371A CN201711352830.0A CN201711352830A CN108288371A CN 108288371 A CN108288371 A CN 108288371A CN 201711352830 A CN201711352830 A CN 201711352830A CN 108288371 A CN108288371 A CN 108288371A
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 99
- 238000005070 sampling Methods 0.000 title claims abstract description 59
- 230000004907 flux Effects 0.000 title claims abstract description 21
- 230000006854 communication Effects 0.000 claims abstract description 34
- 238000004891 communication Methods 0.000 claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims description 5
- 238000012935 Averaging Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 7
- 241001269238 Data Species 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 230000011664 signaling Effects 0.000 abstract description 5
- 230000003993 interaction Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 description 6
- 230000001934 delay Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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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
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/063—Details of electronic electricity meters related to remote communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
Abstract
The present invention, which provides, is based on the time-multiplexed electric flux synchronous sampling system of bus, including main control unit, several generated energy acquisition units, time-division multiplexing unit, time-division multiplexing unit is electrically connected with main control unit and several generated energy acquisition units respectively, main control unit sends synchronous acquisition and instructs to time-division multiplexing unit, the synchronous acquisition received instruction is sent to several generated energy acquisition units by time-division multiplexing unit, several generated energy acquisition units receive synchronous acquisition command synchronization and start ADC conversions, the electric energy data of acquisition is sent to main control unit by time-division multiplexing unit；It is used as synchronous signal line to transmit Synchronous Sampling Pulse signal again while the present invention realizes RS485 buses as communication line transmission data using time-division multiplex technology, interaction of the main control unit to all kinds of complex datas such as the remote signalling of generated energy acquisition unit, telemetering, remote control, remote regulating is realized by RS485 buses.
Description
Technical field
The present invention relates to technical field of electric power communication, more particularly to are based on bus time-multiplexed electric flux synchronized sampling system
System.
Background technology
The various synchronized samplings measured with protective device common demands electric current and voltage data amount in electric system at present, this
It is all of great significance to relay protection of power system, fault distinguishing, system stability analysis, electric energy measurement etc..And with electricity
The development of Force system, the requirement to system monitoring is higher and higher, and an urgent demand can realize that the strange land of exchange data volume synchronizes and adopt
Sample.Previously used a kind of method of radio wave broadcast clock synchronization in foreign countries, but this method have its own be difficult to overcome it is weak
Point：Synchronization accuracy is not high enough.Currently, largely only simple in electric system synchronize control using communications command, together
Low precision is walked, and can only generally realize the synchronous acquisition of data, can not realize the complex control function to acquisition node simultaneously,
It is difficult to meet the remote signalling of protective device, telemetering, remote control, remote regulating requirement simultaneously.
Invention content
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide same based on the time-multiplexed electric flux of bus
Sampling system is walked, solves the problems, such as that allopatric synchronous sampling low precision and communication control ability are weak in electric system.
The present invention, which provides, is based on the time-multiplexed electric flux synchronous sampling system of bus, including main control unit, Ruo Gan electricity
Energy acquisition unit, time-division multiplexing unit, the time-division multiplexing unit respectively with the main control unit and several electric energy
Collecting unit electrical connection is measured, the main control unit sends synchronous acquisition and instructs to the time-division multiplexing unit, and the time-division is multiple
The synchronous acquisition received instruction is sent to several generated energy acquisition units, several generated energy acquisition lists with unit
Member receives the synchronous acquisition command synchronization and starts ADC conversions, and the electric energy data of acquisition is passed through the time-division multiplexing unit
It is sent to the main control unit.
Further, if the time-division multiplexing unit include time multiplexing circuit, communication bus, main control unit interface,
Dry generated energy acquisition unit interface, the time multiplexing circuit respectively with the main control unit interface and several electric fluxs
Collecting unit interface connects, and the main control unit is connect by the main control unit interface with the time multiplexing circuit,
The generated energy acquisition unit is connect by the generated energy acquisition unit interface with the time multiplexing circuit, several electricity
Energy acquisition unit is connect by the communication bus with the main control unit；The main control unit passes through the main control
Unit interface sends synchronous acquisition and instructs to the time multiplexing circuit, and the time multiplexing circuit will by the communication bus
The synchronous acquisition instruction is sent to several generated energy acquisition units, and several generated energy acquisition units pass through several institutes
It states generated energy acquisition unit interface and receives the synchronous acquisition instruction, the electric energy data of acquisition is led in synchronous averaging ADC conversions
It crosses the communication bus and is sent to the main control unit.
Further, the main control unit is equipped with primary synchronization signal line output pin, main serial ports sends pin, main serial ports
Pin is received, the main control unit interface is equipped with master driver input pin, main receiver output pin, main reception difference letter
Number pin, main transmission differential signal pin；The time multiplexing circuit includes the primary synchronization signal line output pin and described
Main serial ports sends pin and is connect respectively with the master driver input pin, and the main serial ports receives pin and the main receiver
Output pin connects, and the main reception differential signal pin is connect with the anode of the communication bus, the main transmission difference letter
Number pin is connect with the negative terminal of the communication bus；The main control unit will be same by the primary synchronization signal line output pin
Step sampling pulse signal is exported to the master driver input pin, and the Synchronous Sampling Pulse signal is through the main control unit
Interface is exported by the communication bus to the generated energy acquisition unit in a manner of differential signal.
Further, the generated energy acquisition unit be equipped with from synchronous signal line input pin, from outlet send pin, from
Serial ports receives pin, the generated energy acquisition unit interface is equipped with from driver input pin, from receiver output pin, from connecing
Astigmat sub-signal pin, from send differential signal pin；The time multiplexing circuit further include it is described from outlet send pin with
It is described from driver input pin connect, it is described from serial ports receive pin and it is described from synchronous signal line input pin respectively with institute
State from receiver output pin connect, it is described from receive differential signal pin connect with the anode of the communication bus, it is described from
Differential signal pin is sent to connect with the negative terminal of the communication bus；The generated energy acquisition unit is by described from synchronizing signal
The line input pin acquisition Synchronous Sampling Pulse signal exported from receiver output pin, several generated energy acquisition lists
Member triggers synchronized sampling according to Synchronous Sampling Pulse signal and interrupts simultaneously.
Further, the communication bus is specially RS485 buses, and the main control unit interface uses MAX485 cores
Piece, the generated energy acquisition unit interface use MAX485 chips, the main control unit total by MAX485 chips and RS485
Line connects, and the generated energy acquisition unit is connect by MAX485 chips with RS485 buses.
Further, the main control unit and several generated energy acquisition units use 32 STM microcontrollers, described
32 STM microcontrollers are connected to by the MAX485 chips in the RS485 buses.
Further, shunt terminal resistance between the side a and b of the RS485 buses, the resistance value of the terminal resistance with
The characteristic impedance value of the RS485 buses is equal.
Further, the side a and b of the RS485 buses is connected pull-up resistor respectively.
Further, the side a and b of the RS485 buses is connected protection diode respectively.
Further, the electric energy data includes voltage data and current data, and the main control unit control is several
Voltage data and the current data described in the generated energy acquisition unit synchronous acquisition.
Compared with prior art, the beneficial effects of the present invention are：
Again as synchronization while the present invention realizes RS485 buses as communication line transmission data using time-division multiplex technology
Signal wire transmits Synchronous Sampling Pulse signal, and time-division multiplex technology realizes that main control unit is logical to the data of generated energy acquisition unit
High-precision Hardware synchronous sampling between letter control and generated energy acquisition unit is exported by the synchronous signal line of main control unit
Pin is connected to the receiver output pin of main control unit interface, and the synchronous signal line input pin of generated energy acquisition unit connects
It is connected to the receiver output pin of generated energy acquisition unit interface, main control unit will be synchronized by synchronous signal line output pin
Sampling pulse signal is sent to main control unit interface, then is exported to generated energy acquisition unit, generated energy acquisition through communication bus
Unit acquires the synchronization of the receiver output pin output of generated energy acquisition unit interface by its synchronous signal line input pin
Sampling pulse signal, several generated energy acquisition units trigger synchronized sampling according to Synchronous Sampling Pulse signal and interrupt, realize simultaneously
Electric energy data synchronous acquisition based on RS485 buses and quickly and effectively transmission, improve the synchronization accuracy between sampling node
And system reliability, field wiring is simple, can arbitrarily increase and delete generated energy acquisition unit as needed, reduce system cloth
Line, system is more flexible, practicability and low cost, realizes main control unit to generated energy acquisition list by RS485 buses
The interaction of all kinds of complex datas such as remote signalling, telemetering, remote control, the remote regulating of member.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, below with presently preferred embodiments of the present invention and after coordinating attached drawing to be described in detail such as.
The specific implementation mode of the present invention is shown in detail by following embodiment and its attached drawing.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the present invention based on the time-multiplexed electric flux synchronous sampling system schematic diagram of bus；
Fig. 2 is the RS485 buses time division multiplexing flow chart of the present invention.
Specific implementation mode
In the following, in conjunction with attached drawing and specific implementation mode, the present invention is described further, it should be noted that not
Under the premise of conflicting, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination
Example.
Based on the time-multiplexed electric flux synchronous sampling system of bus, including main control unit, several generated energy acquisition lists
Member, time-division multiplexing unit, time-division multiplexing unit are electrically connected with main control unit and several generated energy acquisition units respectively, main control
Unit sends synchronous acquisition and instructs to time-division multiplexing unit, and time-division multiplexing unit sends the synchronous acquisition received instruction as
Dry generated energy acquisition unit, several generated energy acquisition units receive synchronous acquisition command synchronization and start ADC conversions, by the electricity of acquisition
Energy datum is sent to main control unit by time-division multiplexing unit.Preferably, electric energy data includes voltage data and electric current
Data, main control unit control several generated energy acquisition unit synchronous acquisition voltage datas and current data.
In one embodiment, as illustrated in fig. 1, it is preferred that time-division multiplexing unit include time multiplexing circuit, communication bus,
Main control unit interface, several generated energy acquisition unit interfaces, the host in the present embodiment is by main control unit and main control list
First interface composition, slave are made of generated energy acquisition unit and generated energy acquisition unit interface, and host and several slaves pass through logical
Believe that bus connection, time multiplexing circuit are connect with main control unit interface and several generated energy acquisition unit interfaces respectively, master control
Unit processed is connect by main control unit interface with time multiplexing circuit, and generated energy acquisition unit is connect by generated energy acquisition unit
Mouth is connect with time multiplexing circuit, and several generated energy acquisition units are connect by communication bus with main control unit；Main control list
Member sends synchronous acquisition by main control unit interface and instructs to time multiplexing circuit, and time multiplexing circuit will by communication bus
Synchronous acquisition instruction is sent to several generated energy acquisition units, and several generated energy acquisition units pass through several generated energy acquisition units
Interface synchronous acquisition instructs, and the electric energy data of acquisition is sent to master control by synchronous averaging ADC conversions by communication bus
Unit processed.
In one embodiment, as illustrated in fig. 1, it is preferred that communication bus is specially RS485 buses, main control unit interface
Using MAX485 chips, generated energy acquisition unit interface uses MAX485 chips, main control unit by MAX485 chips with
RS485 buses connect, and generated energy acquisition unit is connect by MAX485 chips with RS485 buses.Preferably, main control unit and
Several generated energy acquisition units use 32 STM microcontrollers, and it is total that 32 STM microcontrollers by MAX485 chips are connected to RS485
On line, the host in the present embodiment is made of main control unit and MAX485 chips, slave by generated energy acquisition unit and
MAX485 chip interfaces form, it is preferable that main control unit is equipped with primary synchronization signal line output pin OUT1, the transmission of main serial ports is drawn
Foot TXD, main serial ports receive pin RXD, and main control unit interface is equipped with master driver input pin DI, main receiver output pin
RO, main reception differential signal pin A, main transmission differential signal pin B；Time multiplexing circuit includes that the output of primary synchronization signal line is drawn
Foot OUT1 and main serial ports send pin TXD and are connect respectively with master driver input pin DI, and main serial ports receives pin RXD and connect with master
The RO connections of device output pin are received, main reception differential signal pin A is connect with the anode of RS485 buses, and main transmission differential signal draws
Foot B is connect with the negative terminal of RS485 buses；Main control unit is by primary synchronization signal line output pin OUT1 by Synchronous Sampling Pulse
Signal is exported to master driver input pin DI, and Synchronous Sampling Pulse signal is passed through through MAX485 chips in a manner of differential signal
RS485 buses are exported to generated energy acquisition unit.
In one embodiment, as illustrated in fig. 1, it is preferred that generated energy acquisition unit is equipped with from synchronous signal line input pin
IN1, it sends pin TXD from outlet, receive pin RXD from serial ports, generated energy acquisition unit interface, which is equipped with from driver input, to be drawn
Foot D1, from receiver output pin RO, from receive differential signal pin A, from send differential signal pin B；Time multiplexing circuit
Further include sending pin TXD from outlet to connect with from driver input pin DI, from serial ports reception pin RXD and from synchronizing signal
Line input pin IN1 is connect with from receiver output pin RO respectively, from receiving differential signal pin A and RS485 buses just
End connection is connect from differential signal pin B is sent with the negative terminal of RS485 buses；Generated energy acquisition unit is by from synchronizing signal
The Synchronous Sampling Pulse signal that the IN1 acquisitions of line input pin are exported from receiver output pin RO, several generated energy acquisition units
Synchronized sampling is triggered simultaneously according to Synchronous Sampling Pulse signal to interrupt.
In one embodiment, as shown in Figure 1 to Figure 2, RS485 buses time division multiplexed process includes：Timing or active
Triggering starts synchronized sampling, and host sends synchronized sampling instruction first in a manner of broadcasting command to each slave, then host
Stopping sends and receivees data processing, and host enters interruption, starts T1 time delays, T1 delays to rear, the master of main control unit
Synchronous signal line output pin OUT1 exports Synchronous Sampling Pulse signal to the master driver input pin DI of MAX485, synchronizes and adopts
Sample pulse signal reaches the MAX485 of slave after the MAX485 of host in a manner of differential signal by RS485 buses, main
After machine exports Synchronous Sampling Pulse signal, restart to send and receive data processing after T2 is delayed；Each slave receives
Broadcast synchronized sampling instruction after, at once stop send and receive data processing, and begin through generated energy acquisition unit from
The Synchronous Sampling Pulse letter of the slave receiver output pin RO outputs of the MAX485 of synchronous signal line input pin IN1 acquisition slaves
Number, each slave triggers synchronized sampling interruption simultaneously, starts synchronized sampling processing, and collected electric energy data is packaged by slave
It is sent to host by RS485 buses, slave starts T3 time delays, and T3 delays restart to send and receive data to rear
Processing.The T3 time spans of slave are more than the T1 time spans of host, and the sum of T1 time spans and T2 time spans of host are big
In the T3 time spans of slave.After slave starts synchronized sampling processing, host and slave progress normally send and receive data,
RS485 buses are as the data communication bus between host and slave at this time, realize the telemetering of host and slave, remote signalling, remote control,
The interaction of all kinds of complex datas such as remote regulating.
In one embodiment, it is preferable that shunt terminal resistance between the side a and b of RS485 buses, the resistance of terminal resistance
Value is equal with the characteristic impedance value of RS485 buses, with the increase of RS485 buses distance and load number, the property of RS485 buses
It can reduce, the shunt terminal resistance between the side a and b of RS485 buses realizes the resistors match of communicating pair.Preferably,
The side a and b of RS485 buses is connected pull-up resistor respectively, improves the driving capability of RS485 buses.Preferably, RS485 buses
Side a and b connect respectively protection diode, prevent damage of the high voltage surge introduced suddenly in communication process the interference to device
It is bad.
Again as synchronization while the present invention realizes RS485 buses as communication line transmission data using time-division multiplex technology
Signal wire transmits Synchronous Sampling Pulse signal, and time-division multiplex technology realizes that main control unit is logical to the data of generated energy acquisition unit
High-precision Hardware synchronous sampling between letter control and generated energy acquisition unit is exported by the synchronous signal line of main control unit
Pin is connected to the receiver output pin of main control unit interface, and the synchronous signal line input pin of generated energy acquisition unit connects
It is connected to the receiver output pin of generated energy acquisition unit interface, main control unit will be synchronized by synchronous signal line output pin
Sampling pulse signal is sent to main control unit interface, then is exported to generated energy acquisition unit, generated energy acquisition through communication bus
Unit acquires the synchronization of the receiver output pin output of generated energy acquisition unit interface by its synchronous signal line input pin
Sampling pulse signal, several generated energy acquisition units trigger synchronized sampling according to Synchronous Sampling Pulse signal and interrupt, realize simultaneously
Electric energy data synchronous acquisition based on RS485 buses and quickly and effectively transmission, improve the synchronization accuracy between sampling node
And system reliability, field wiring is simple, can arbitrarily increase and delete generated energy acquisition unit as needed, reduce system cloth
Line, system is more flexible, practicability and low cost, realizes main control unit to generated energy acquisition list by RS485 buses
The interaction of all kinds of complex datas such as remote signalling, telemetering, remote control, the remote regulating of member.
More than, only presently preferred embodiments of the present invention is not intended to limit the present invention in any form；All one's own professions
The those of ordinary skill of industry can be shown in by specification attached drawing and above and swimmingly implement the present invention；But all to be familiar with sheet special
The technical staff of industry without departing from the scope of the present invention, is made a little using disclosed above technology contents
The equivalent variations of variation, modification and evolution are the equivalent embodiment of the present invention；Meanwhile all substantial technologicals according to the present invention
To the variation, modification and evolution etc. of any equivalent variations made by above example, technical scheme of the present invention is still fallen within
Within protection domain.
Claims (10)
1. being based on the time-multiplexed electric flux synchronous sampling system of bus, it is characterised in that：Including main control unit, several electric energy
Measure collecting unit, time-division multiplexing unit, the time-division multiplexing unit respectively with the main control unit and several electric fluxs
Collecting unit is electrically connected, and the main control unit sends synchronous acquisition and instructs to the time-division multiplexing unit, the time division multiplexing
The synchronous acquisition received instruction is sent to several generated energy acquisition units, several generated energy acquisition units by unit
It receives the synchronous acquisition command synchronization and starts ADC conversions, the electric energy data of acquisition is sent out by the time-division multiplexing unit
It send to the main control unit.
2. being based on the time-multiplexed electric flux synchronous sampling system of bus as described in claim 1, it is characterised in that：When described
It includes time multiplexing circuit, communication bus, main control unit interface, several generated energy acquisition unit interfaces, institute to divide Multiplexing Unit
It states time multiplexing circuit to connect with the main control unit interface and several generated energy acquisition unit interfaces respectively, the master
Control unit is connect by the main control unit interface with the time multiplexing circuit, and the generated energy acquisition unit passes through institute
It states generated energy acquisition unit interface to connect with the time multiplexing circuit, several generated energy acquisition units pass through the communication
Bus is connect with the main control unit；The main control unit sends synchronous acquisition instruction by the main control unit interface
To the time multiplexing circuit, the time multiplexing circuit is sent synchronous acquisition instruction as by the communication bus
The generated energy acquisition unit is done, several generated energy acquisition units are received by several generated energy acquisition unit interfaces
The electric energy data of acquisition is sent to by the communication bus described by synchronous acquisition instruction, synchronous averaging ADC conversions
Main control unit.
3. being based on the time-multiplexed electric flux synchronous sampling system of bus as claimed in claim 2, it is characterised in that：The master
Control unit is equipped with primary synchronization signal line output pin, main serial ports sends pin, main serial ports receives pin, the main control unit
Interface is equipped with master driver input pin, main receiver output pin, main reception differential signal pin, main transmission differential signal and draws
Foot；The time multiplexing circuit includes the primary synchronization signal line output pin and the main serial ports send pin respectively with it is described
Master driver input pin connects, and the main serial ports receives pin and connect with the main receiver output pin, the main reception
Differential signal pin is connect with the anode of the communication bus, and the main transmission differential signal pin is negative with the communication bus
End connection；The main control unit is exported Synchronous Sampling Pulse signal to described by the primary synchronization signal line output pin
Master driver input pin, the Synchronous Sampling Pulse signal pass through institute through the main control unit interface in a manner of differential signal
Communication bus is stated to export to the generated energy acquisition unit.
4. being based on the time-multiplexed electric flux synchronous sampling system of bus as claimed in claim 3, it is characterised in that：The electricity
Energy acquisition unit is equipped with from synchronous signal line input pin, sends pin from outlet, receives pin, the electric flux from serial ports
Collecting unit interface be equipped with from driver input pin, from receiver output pin, from receive differential signal pin, from send it is poor
Sub-signal pin；The time multiplexing circuit further includes described from outlet transmission pin and described from driver input pin company
Connect, it is described from serial ports receive pin and it is described from synchronous signal line input pin respectively with it is described from receiver output pin connect
It connects, it is described to be connect from reception differential signal pin with the anode of the communication bus, it is described from transmission differential signal pin and institute
State the negative terminal connection of communication bus；The generated energy acquisition unit by it is described from the acquisition of synchronous signal line input pin it is described from
The Synchronous Sampling Pulse signal of receiver output pin output, several generated energy acquisition units are believed according to Synchronous Sampling Pulse
Number simultaneously trigger synchronized sampling interruption.
5. being based on the time-multiplexed electric flux synchronous sampling system of bus as claimed in claim 4, it is characterised in that：It is described logical
Believe that bus is specially RS485 buses, the main control unit interface uses MAX485 chips, the generated energy acquisition unit interface
Using MAX485 chips, the main control unit is connect by MAX485 chips with RS485 buses, the generated energy acquisition unit
It is connect with RS485 buses by MAX485 chips.
6. being based on the time-multiplexed electric flux synchronous sampling system of bus as claimed in claim 5, it is characterised in that：The master
Control unit and several generated energy acquisition units use 32 STM microcontrollers, 32 STM microcontrollers to pass through described
MAX485 chips are connected in the RS485 buses.
7. being based on the time-multiplexed electric flux synchronous sampling system of bus as claimed in claim 5, it is characterised in that：It is described
Shunt terminal resistance between the side a and b of RS485 buses, the resistance value of the terminal resistance and the characteristic of the RS485 buses hinder
Anti- value is equal.
8. being based on the time-multiplexed electric flux synchronous sampling system of bus as claimed in claim 5, it is characterised in that：It is described
The side a and b of RS485 buses is connected pull-up resistor respectively.
9. being based on the time-multiplexed electric flux synchronous sampling system of bus as claimed in claim 5, it is characterised in that：It is described
The side a and b of RS485 buses is connected protection diode respectively.
10. being based on the time-multiplexed electric flux synchronous sampling system of bus as described in claim 1, it is characterised in that：It is described
Electric energy data includes voltage data and current data, and several generated energy acquisition units of main control unit control synchronize
Acquire the voltage data and the current data.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109358256A (en) * | 2018-12-20 | 2019-02-19 | 上海欧秒电力监测设备有限公司 | The arrester on-line monitoring system of synchronized sampling is realized in RS485 communication |
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| CN103972909A (en) * | 2014-05-26 | 2014-08-06 | 上海双电电气有限公司 | TSC (thyristor switched capacitor) system and RS485 communication method thereof based on FPGA (Field Programmable Gate Array) |
| CN207650988U (en) * | 2017-12-15 | 2018-07-24 | 广州智光自动化有限公司 | Based on the time-multiplexed electric flux synchronous sampling system of bus |
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| CN109358256A (en) * | 2018-12-20 | 2019-02-19 | 上海欧秒电力监测设备有限公司 | The arrester on-line monitoring system of synchronized sampling is realized in RS485 communication |
| CN109358256B (en) * | 2018-12-20 | 2021-09-03 | 上海欧秒电力监测设备有限公司 | Lightning arrester on-line monitoring system for realizing synchronous sampling in RS485 communication |
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