CN107202919A - Intelligent electric energy meter with communication interface - Google Patents
Intelligent electric energy meter with communication interface Download PDFInfo
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- CN107202919A CN107202919A CN201610963795.5A CN201610963795A CN107202919A CN 107202919 A CN107202919 A CN 107202919A CN 201610963795 A CN201610963795 A CN 201610963795A CN 107202919 A CN107202919 A CN 107202919A
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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
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The present invention provides a kind of intelligent electric energy meter with communication interface, including electric energy collection module, real-time clock, liquid crystal display, communication module, data storage, power module and key-press module, signal is changed into the acceptable electric signals of electric energy computation chip RN8209 by the data acquisition module by the voltage of the household load collected, current information by attenuation filter sample circuit, and the active power of user is obtained by the electric energy computation chip RN8209 counting circuits being internally integrated；Wherein microprocessor is communicated by SPI mouthfuls with electric energy computation chip, and the power information of user is shown by liquid crystal screen module to facilitate user to check and be transferred to data memory module.
Description
Technical field
The present invention relates to intelligence instrument, especially with the intelligent electric energy meter of communication interface.
Background technology
Under the promotion that green energy conservation is realized, competitively sent out as countries in the world using intelligent electric energy meter as the intelligent grid of core
One major fields of exhibition.Development intelligent grid can also allow utilities and user to be benefited.As intelligent grid can help electricity
Force mechanisms reduction operation expenditure, reduction stealing, optimizing management and summary responses user's request etc..User also has an opportunity to enjoy more
Flexible price, because network measurement saves cost and helps to realize home automation etc..Therefore, the development prospect of intelligent grid is quite
By good.IBM Corporation in 2006 formally proposes " intelligent grid " this concept.The U.S. in 2009 is made by the construction of propulsion intelligent grid
Implemented for an economic policy, subsequent May in the same year, the U.S. formulated " intelligent grid development pattern " standard first, from this
The U.S. enters the intelligent grid epoch.As the U.S. is brought to the research of intelligent grid and its achievement obtained in people live
Facility, intelligent grid starts the fashionable whole world.The development strategy of " building strong intelligent grid " that China proposed in 2009, this
It is also the new beginning with milestone significance in China's intelligent grid evolution.Up to now, China's intelligent power grid technology ten
Divide consummation, be the core force for promoting global intelligent grid development.Intelligent grid is continued to develop and innovated not only energetically
Ground has promoted China's economy, culture, military construction, has been also convenient for the life of people.Intelligent grid is different from traditional power network, it
It is based on integrated high-speed network service, using the sensing technology of modernization, the equipment of precise high-efficiency, the elder generation of Internationalization level
Enter control theory to realize the intellectuality of intelligent grid, economized, environmental protection, economization.Intelligent electric energy meter is used as intelligent grid
Terminal and inalienable part, its speed of development directly influences intelligent grid and realizes environmental protection, economized, information
Change, automate and interactive speed.
Traditional electric energy meter can only carry out simple electric quantity metering, traditional with expanding economy and the progress of science and technology
Electric energy meter can not meet the demand in epoch.For the step kept pace with the times, intelligent electric energy meter arises at the historic moment, and it not only possesses tradition
The basic performance of electric energy meter, but also the exclusive two-way communication of oneself, remote meter reading, remote control user end, anti-electricity-theft etc.
Function, solve power department carry out visit meter reading and difficult charge the problem of.
Intelligent electric energy meter used in now is generally divided into two classes, and a class is the intelligence electricity for being only capable of being supplemented with money by IC-card
Energy table, another kind of is the intelligent electric energy meter for being only capable of supplementing with money online by wireless network.Although this two classes electric energy meter has very big
Advantage, but simultaneously there is also some drawbacks, such as there are still the problems such as communication is not smooth, metering is inaccurate.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of intelligent electric energy meter with communication interface, including electric energy is adopted
Collect module, real-time clock, liquid crystal display, communication module, data storage, power module and key-press module, the data acquisition module
Signal is changed into electric energy computation chip by the voltage of the household load collected, current information by attenuation filter sample circuit
The acceptable electric signals of RN8209, the wattful power of user is obtained by the electric energy computation chip RN8209 counting circuits being internally integrated
Rate；Wherein microprocessor is communicated by SPI mouthfuls with electric energy computation chip, and the power information of user is shown by liquid crystal screen module
Out to facilitate user to check and be transferred to data memory module.
Further, the intelligent electric energy meter also includes main control unit, and the main control unit (MCU) is from ST companies
32 STM32F103RBT6 microcontrollers are as the Master control chip of electric meter system, and its concrete configuration is as follows：Support fixed
When device, digital-to-analogue conversion, analog-to-digital conversion, SPI communication, I2DMA (DirectMemory Access) controller of C and UART modules；
4 16 bit timing devices, the senior timer of 6 passages, independent house dog and the window WatchDog Timer of 2 16,1 24 fall
The Systick timers of counting, I2C interface, SPI interface, UART interface, CAN interface USB2.0 interfaces and SD_CARD
I/O interface.
Further, the intelligent electric energy meter also includes control source terminal circuit and current input terminal circuit, the voltage
The voltage channel of inlet circuit has three single ended voltage inputs:VAP,VBP,VCP；Single ended voltage is inputted relative to VN most
Big input voltage be that ± 0.5V, VxP and VN simulation maximum input level are ± 0.5V, the maximum common-mode signal of input is ±
25mV, enters in voltage transformer, the mutual induction of voltage wherein becoming a low current after the big resistance of 150K per phase voltage
Device selects bright ZMPT101B using Nanjing, and the ratio of ZMPT101B input currents and output current is 2000:2000, subsequently into
It is made up of inside chip LM224, LM224 two amplifiers.
The current channel of the current input terminal circuit is four pairs of differential voltage inputs:IAP and IBN, IBP and ICN, ICP
With ICN and INP and INN, the maximum differential signal of control source pairing for ± O.5V, IxP is to IxN maximum analog signal electricity
Put down as ± 25mV, current transformer selects the ZMCT118A of Nanjing Ze Ming companies, and ZMCT118A specified input current is 5A, volume
It is 2.5mA to determine output current.
Further, the real time clock circuit uses DS1302, and the intelligent electric energy meter uses RS-485 serial communications
Mode, the RS-485 interfaces Mulit-point Connection constitutes automatic meter reading system, directly using RS- by RS-485 buses
485 driving chips, multiple electric energy meters constitute communication network by twisted pair line connection.
Further, the RS-485 circuits use ADM2483, the ADM2483 to include triple channel isolator, one
The individual differential driver with ternary output and a differential receiver inputted with tri-state.
Further, information recognition device is also equipped with the intelligent electric energy meter, described information identifying device is used
RFID, label antenna matches the label antenna of minor matters, the symmetrical arrangement of the label antenna, to mark to add
The center mounting hole axis for signing chip is symmetric reference, and the electric wire is extended by following direction successively on the right side of symmetric reference：First
Level extends to the right then to be extended straight up, then level extends then extend straight down to the right, and then level extends to the right
Extend straight up again, then level extends to the right extends straight up again, then level extends to the right extends straight down again,
Then level extends in extend straight up to the left, and final level extends to the right；Antenna left part is in mirror image with right part
It is symmetrical arranged.The similar two clips arrangement of the antenna overall shape.Wherein match the T-shaped shape of minor matters, centrally disposed installation
Above hole.
Compared with prior art, the beneficial effects of the invention are as follows：The communication function and metering accuracy of electric energy meter are improved,
And the transport sorting of electric energy meter is facilitated, improve conevying efficiency.
Brief description of the drawings
Fig. 1 is the overall hardware chart of the present invention；
Fig. 2 is voltage collection circuit of the invention；
Fig. 3 is current collection circuit of the invention；
Fig. 4 is clocking scheme of the invention；
Fig. 5 is the RS-485 of present invention program flow diagram；
Fig. 6 a-6c are the intelligent electric energy meter profiles and installation diagram of the present invention；
Fig. 7 is the label antenna of the information recognition device of the intelligent electric energy meter of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is all other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
It should be noted that each marque or communications protocol and each technical term for being referred in the present invention, are all institutes
The technical terms clearly known already in category technical field, therefore no longer do excessive explanation.
The intelligent electric energy meter with communication interface in the present invention is in order to meet family's electric energy metrical demand, using special
Electric energy computation chip and microprocessor coordinate the conceptual design of appropriate peripheral circuit.First, it is ensured that user's electric energy metrical
Accuracy, can realize accurate metering, the chip is analog-digital converter, number in design using special electric energy computation chip RN8209
The functional circuits such as word integrator, wave filter are integrated into a chip, in this way can be in AD conversion, digital integration
Minimum is reduced to Deng the error produced in circuit, so as to realize accurate metering.Secondly, in response to country save energy policy and
Tou power price mechanism, intelligent electric energy meter should possess time-sharing measurement function.Realization of this function based on Software for Design, sets peak respectively
Section, paddy section and respective electricity charge rate, electric energy meter measure the electricity of the period and preserved within each period.Simultaneously
Also to meet the reading and storage of energy measurement information, master controller reads in computation chip data message and believes these
Breath is dumped in corresponding memory cell.In addition to several above-mentioned functions, should also possess warning function, query function etc..
Intelligent electric energy meter should also possess bi-directional communication function, and necessary technology branch is provided to implement remote concentrated ammeter reading
Hold.The current remote centralized meter-reading system communication mode of China generally uses following several ways：Optical fiber private network, 230MHZ wireless private networks,
The communication modes such as GPRS, are wireless private network and GPRS using frequency highest communication mode.
Bi-directional communication modules use RS485 serial communications in the present invention, have the advantages that low cost, transmission range farther out.
Two-way communication is realized by RS485 signal receivers, the function that the remote auto collection in a cell is copied can be realized.
The intelligent electric power meter hardware structure of the present invention is broadly divided into electric energy acquisition part and information about power processing two by function
It is most of, particularly may be divided into electric energy collection module, real-time clock, liquid crystal display, communication module, data storage, power module and by
Key module etc..Data acquisition module function is that voltage, the current information for gathering household load pass through attenuation filter sample circuit handle
Signal is changed into the acceptable electric signals of RN8209, is obtained by the special electric energy computation chip RN8209 counting circuits being internally integrated
The active power of user.Microprocessor is the core of management system and task, is communicated by SPI mouthfuls with electric energy computation chip, will
The power information of user shows to facilitate user to check and be transferred to data memory module by liquid crystal screen module.User's electricity
Energy metering units core selects special electric energy computation chip RN8209.It is the single-phase electric energy computation chip of a high accuracy,
With two-way pulse output function and a serial line interface.It is integrated with second order es-D analog-digital converters, digital integrator, benchmark electricity
Road, and all progress are active, the Signal Processing Element needed for idle and apparent electric energy metrical and virtual value metering, therefore should
The need for chip can meet design.
Main control unit (MCU) is used as electric energy meter system from 32 STM32F103RBT6 microcontrollers of ST companies
Master control chip.The features such as it has low-power consumption, low cost and high-performance, while providing clock, reset and power management work(
Energy.Concrete configuration is as follows：Support timer, digital-to-analogue conversion, analog-to-digital conversion, SPI communication, I2The DMA of the modules such as C and UART
(DirectMemory Access) controller.4 16 bit timing devices, the senior timer of 6 passages of 2 16, independent house dogs
The Systick timers counted down with window WatchDog Timer, 1 24.13 communication interfaces can be at most extended, including
I2C interface, SPI interface, UART interface, CAN interface USB2.0 interfaces and SD_CARD I/O interfaces.It is outer that chip enriches
If resource, highly integrated above-mentioned functions modules substantially reduce the volume and complexity of system, can guarantee that electric energy meter system can
By operation.
Using the real-time timepiece chip DS1302 produced by DALLAS companies of the U.S., this chip performance is high and low in energy consumption,
Exact date timetable can be provided simultaneously.The chip uses dual power supply, ensure that the accurate operation of system.It is domestic at present
All kinds of measuring instruments all use DS1302 to provide time data for system mostly.
Because the master controller internal storage space of the present invention is limited, and it is mainly used in the accumulating operation of electricity, each
The electricity of user's consumption of peak interval of time needs to dump in external memory chip, facilitates user to consult historical information.In addition, weight
Major issue specifying information also needs storage to arrive external chip.In view of Atmel Products AT24CXX family chips read-write data are quick
It is smaller additionally, due to ephemeral data memory space needed for electric energy meter inside and utilization rate is higher, therefore chip is selected in the present invention
AT24C02.Certainly, the external memory chip not limited to this chip in the present invention, can also be suitable from other as needed
Storage chip.Such as Atmel Products AT25CXX series or AT26CXX family chips.Or select other to deposit as needed
Store up chip.In the following description, by taking AT24C02 chips as an example, but the invention is not restricted to this.
Communication module selects RS485 communication modes.It is double that RS-485 bus communications typically can be achieved with half-duplex using 2 systems
To communication.A table so can quickly be constituted to the interactive type communication network between multilist or multilist, be entirely capable of reaching that one is adopted
The requirement interconnected between collection terminal and multiple electric energy meters.
In real work, the single-phase house lead in that domestic power system is typically used, a zero line (N), a live wire (L),
Both end voltage is 220V alternating currents.When opening household electrical appliance, electrical equipment two ends can add 220V alternating currents, while producing electricity on circuit
Stream.Acquisition Circuit, the electric energy meter data to be detected are the voltage and current signals on loaded line.Electric current on circuit,
Voltage is input to RN8209 chip signal input ports respectively through manganese copper diverter and divider resistance, integrated by chip internal
Filter circuit, analog-to-digital conversion circuit, calculate various electrical parameter virtual values, active power, nothing after digital integrating circuit
Work(power etc. is simultaneously stored in corresponding register.Concrete methods of realizing is main in daily set time point when paddy (during peak and)
Controller reads the numerical value of corresponding registers, and user's information about power is transferred in AT24C02 memory modules.Master controller with
Communication between metering module is realized by the SPI port of RN8209 chips, when abnormal emergency occurs on circuit,
The unexpected situation such as power failure or overload, RN8209 computation chips will be produced an interrupt signal by interruptive port and notify master
Controller issues corresponding information.
Real-time clock DS1302 modules, key-press module, data storage AT24C02 modules, liquid crystal display display module and RS485
Communication module is the peripheral functional modules of master controller, and its effect is that corresponding function is realized in whole electric energy meter system.
Communication between master controller and data memory module is completed by bus, and the information about power that calculating is obtained by the program of writing turns
Deposit to the corresponding memory cell of memory module, the effect of display module is that related service data is passed through liquid crystal display by master controller
User is supplied to, with for reference display module concrete image.RS485 communication modules are then responsible for intelligent electric energy meter and long-range
Collection copies the two-way communication between station, realizes automatic meter-reading and on-line monitoring distribution Running State.
Electric energy meter is using progress calibration is preceding needed, and the chip internal possesses several frequency converters, can turn data signal
It is changed to frequency signal and is exported from two output ports of PF (port 23) and QF (port 24).Calibration process is by detection pulse
The frequency of output port is come what is realized, and the frequency of pulse is directly proportional with corresponding power.Its method implemented is：Simultaneously will
Pulse signals are detected in electric energy meter and standard scale access loaded line, and resulting normal data is passed through into master controller
In the register for writing RN8209.
Intelligent electric energy meter of the intelligence of the present invention with communication interface is that realization is certain with the difference of ordinary electronic formula ammeter
Intelligent functions, following functions should be possessed according to actual application demand intelligent electric energy meter：Electric energy metrical function, parameters of electric power
The function such as detection and display, data storage function, real-time clock and multi tariff charging.The intelligence with communication interface of the present invention
Its function of electric energy meter is as follows in detail：
1. electric energy metrical
Intelligent electric energy meter needs the electrical parameter for measuring and calculating to include during customer electricity：Voltage, electric current, power because
Number, active power and reactive power.User more intuitively understands the operational factor of electrical equipment for convenience, using liquid crystal screen display
Show the parameters such as current voltage, electric current, total active power, current rate.
2. multi tariff and period function
From the mid-90 in last century, power network is in order to realize the target of peak load shifting, and charging policy progressively exists at times
Promoted in nationwide, this policy not only can effectively adjust electric load, make electric load curve more smooth, it is whole big
Network system operation is more steady, and produces positive guiding function to the daily consumption habit of resident, promotes resident reasonable
Electricity consumption, using electricity wisely.This function is proposed on the basis of response tou power price, in view of many provinces and cities all come into effect at present
Tou power price policy, therefore multi tariff billing function turns into one of basic function that should possess of intelligent electric energy meter.
3. real-time clock function
Time parameter is a very crucial parameter to electric energy meter system, and it is not only related to the storage of user data, also
Billing function at times can be influenceed.Master controller passes through the detection to electric energy meter time parameter, it is possible to achieve during to peak and during paddy
The calculating and storage of operational factor in section, moreover it is possible to realize the time of origin point of accurate recording failure, fixed a breakdown with facilitating.
4. anomalous event writing function
The quality of power supply and national economy interests are closely bound up, and the excellent quality of power supply not only contributes to domestic electric appliance
Operation, moreover it is possible to suitably extend the operation time limit of electrical equipment.And the quality of power supply refer mainly to indicate voltage, frequency and waveform.It is single-phase
High-precision electric energy computation chip RN8209 is in addition to basic electric energy measurement, moreover it is possible to monitor power quality parameter.When occur power-off,
When the anomalous events such as overcurrent occur, chip sends interruptive command by interrupt response to master controller, records event generation
Time and type.
5. bi-directional communication function
Centralized automatic meter-reading function and intelligent energy-saving function are realized, ammeter and Utilities Electric Co.'s collection copy the Bidirectional flow of information between station
Dynamic is essential function.At present, on the one hand, the ammeter of in the market can effectively record the power information of each user, and
The collection that the power consumption information of storage is uploaded into each power supply administration destroies station, but complete user data is analyzed by power supply administration
Afterwards, collection is destroyed station and real time information can not but fed back on electric supply meter.On the other hand, power supply administration is according to the result of load prediction,
The Spot Price information and family's power-saving strategies drawn can not Real-time Feedback to user terminal.So, bi-directional communication function is pin
The function that problems are designed.Illustrate：Some tou power price policies that Utilities Electric Co. formulates, some period tool
The electricity price information of body is how many, and these data then can be sent to user terminal by user with some electrical equipments of selectively unlocking.
User side can independently select to open equipment or selection is cancelled after data are received.So it can not only be used with A clear guidance
Family electricity consumption bad habit bad before changing, produce certain economic benefit, and can alleviate electric power peak-valley difference.
Wherein each phase voltage is mainly changed into the measurable electricity of computation chip by the circuit of voltage input end of the invention
Press scope.Schematic diagram is as shown in Figure 2.Voltage channel has three single ended voltage inputs:VAP,VBP,VCP.Single ended voltage is inputted
Maximum input voltage relative to VN is scholar 0.5V.In addition, VxP and VN simulation maximum input level is ± 0.5V.Input
Maximum common-mode signal be ± 25mV.Wherein become a low current after the big resistance of 150K per phase voltage and enter mutual induction of voltage
In device.Voltage transformer selects bright ZMPT101B using Nanjing, and the ratio of ZMPT101B input currents and output current is 2000:
2000.Subsequently into chip LM224, it is made up of inside LM224 two amplifiers, the function that first amplifier is realized is that IU turns
Become, second amplifier is the effect visited to second-order filter.
The circuit theory diagrams of wherein current input terminal of the invention are as shown in Figure 3.ADE7878 has seven simulation input structures
Into electric current and voltage channel.Current channel is four pairs of differential voltage inputs:IAP and IBN, IBP and ICN, ICP and ICN and INP
And INN.The maximum differential signal of control source pairing for ± O.5V in addition, IxP to IxN maximum analog signal level for ±
25mV.Current transformer selects the ZMCT118A of Nanjing Ze Ming companies, and ZMCT118A specified input current is 5A, rated output
Electric current is 2.5mA.So after IU is changed, the requirement of computation chip input voltage is then can reach by second-order filter again.
The clock circuit of the present invention uses DS1302, and DS1302 is the trickle charge clock core that DALLAS companies release
Piece, inside contains a real-time clock/calendar and 31 bytes static state RAM, is communicated by simple serial line interface with DSP.It is real
Shi Shizhong/calendar circuit provide the second, point, when, the information of year, month, day, number of days and the number of days in leap year monthly can adjust automatically when
Clock operation can indicate to determine using 24 or 12 hours forms by AM/PM.Can be simply using synchronous string between DS1302 and DSP
Capable mode is communicated, it is only necessary to use three mouth lines:1RES resets；2I/O data wires；3SCL serial clocks.DS1302 works
When power consumption it is very low, keep data and power be less than 1mW during clock information.DS1302 is improved by DS 1202, add with
Under characteristic, dual power supply pin is used for main power source and backup battery supply Vccl, additional seven for programmable trickle charge power supply
Byte memory.It is widely used in the product scope such as telefacsimile portable instrument and battery powered instrument and meter.Fig. 4
For the clocking scheme of the present invention.
EIA is that the asynchronous serial transmission between smart machine has formulated several standard interfaces, electric energy meter
Conventional has RS-232, RS-422, RS-485, and the present invention uses RS-485 serial communication modes.The RS-485 of standard is
The serial line interface the most ripe of short range transmission data message.RS-485 interfaces are used to pass through RS-485 with Mulit-point Connection
Bus constitute automatic meter reading system, directly use RS-485 driving chips, multiple electric energy meters by twisted pair line connection just
It may make up communication network.DL/T645-2007 is provided:RS-485 interfaces use hypotactic half-duplex operation mode；Common mode is defeated
Enter voltage range -7~12V, differential-mode input voltage is more than 0.2V；Exported using tri-state mode, at 54 Europe of load impedance, driving
Output voltage maximum 5V, minimum 1.5V driving forces should not less than 32 similar interfaces；It is not more than 1OOKb/s's in traffic rate
Under the conditions of, effective propagation path is not less than 1200m；Bus is passive, and isolation electricity is provided by electric energy meter or data terminal equipment
Source.
The main element that the RS-485 circuits of the present invention are used is ADM2483.ADM2483 is increasing of the ADI companies with isolation
Strong type RS-485 transceivers.It includes a triple channel isolator, a differential driver with ternary output and a band three
The differential receiver of state input.The receiver input impedance of its 1/8 unit load can allow up to 256 transceiver accesses total
Line.Maximum transmission rate is up to 5OOKbps.Logical end compatibility 3V/5V working powers, bus end 5V powers.ADM2483 driving
Utensil has short circuit current flow limitation, it is possible to driver output is set into high-impedance state by Thermal shutdown protection circuit, prevented excessively
Power attenuation.Chip package is encapsulated using wieldy SO-16, technical grade temperature range, without any discrete component just
RS485 functions can be achieved.Fig. 5 is RS-485 program flow diagram.
Fig. 6 a-6c are the intelligent electric energy meter overall dimensions and installation diagram of the present invention.
The intelligent electric energy meter of the present invention has carried out dependence test, as a result as follows：
During the packed and transported of the intelligent electric energy meter of the present invention, in order to adapt to the development need of modern logistics industry,
It is rapid to improve sorting and efficiency of storage, information recognition device is also equipped with the intelligent electric energy meter of the present invention, described information is known
Other device uses RFID, and label antenna is adds the label antenna of matching minor matters, and the label antenna is right in left and right
Claim arrangement, the center mounting hole axis using label chip is symmetric reference, and the electric wire is on the right side of symmetric reference successively by as follows
Direction extends：First level extends to the right then to be extended straight up, then level extends then extend straight down to the right, then water
Flat extend to the right extends straight up again, and then level extends to the right extends straight up again, and then level extends erect again to the right
Directly extend downwardly, then level extends in extend straight up to the left, final level extends to the right；Antenna left part and right side
Part is set in specular.The similar two clips arrangement of the antenna overall shape.The T-shaped shape of minor matters is wherein matched, is set
Above center mounting hole, as shown in Figure 7.
The present invention realizes the abilities such as bidirectional measuring, data processing, two-way communication and the Function Extension of intelligent electric energy meter, tool
There are very high market prospects and application prospect.
To those skilled in the art, the invention is not restricted to the details of above-mentioned one exemplary embodiment, and do not carrying on the back
In the case of spirit or essential attributes from the present invention, the present invention can be realized in other specific forms.Therefore, no matter from which
From the point of view of a bit, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention will by appended right
Ask rather than described above is limited, it is intended that all changes in the implication and scope of the equivalency of claim will be fallen
Include in the present invention.Any reference in claim should not be considered as to the claim involved by limitation.
Described above, only presently preferred embodiments of the present invention is not intended to limit the invention, every skill according to the present invention
Any trickle amendment, equivalent substitution and improvement that art is substantially made to above example, should be included in technical solution of the present invention
Protection domain within.
Claims (6)
1. a kind of intelligent electric energy meter with communication interface, including electric energy collection module, real-time clock, liquid crystal display, communication module,
Data storage, power module and key-press module, the data acquisition module is by the voltage of the household load collected, current information
Signal is changed into by attenuation filter sample circuit by the acceptable electric signals of electric energy computation chip RN8209, passes through electric energy metrical core
The counting circuit that piece RN8209 is internally integrated obtains the active power of user；Wherein microprocessor passes through SPI mouthfuls and electric energy metrical
Chip communication, the power information of user is shown by liquid crystal screen module to facilitate user to check and be transferred to data storage
Module.
2. intelligent electric energy meter as claimed in claim 1, it is characterised in that the intelligent electric energy meter also includes main control unit,
The main control unit (MCU) selects 32 STM32F103RBT6 microcontrollers of ST companies as the master control of electric energy meter system
Coremaking piece, its concrete configuration is as follows：Support timer, digital-to-analogue conversion, analog-to-digital conversion, SPI communication, I2C and UART modules
DMA (DirectMemory Access) controller；4 16 bit timing devices, the senior timer of 6 passages of 2 16, independences
House dog and window WatchDog Timer, the 1 24 Systick timers that count down, I2C interface, SPI interface, UART connect
Mouth, CAN interface USB2.0 interfaces and SD_CARD I/O interfaces.
3. intelligent electric energy meter as claimed in claim 1, it is characterised in that the intelligent electric energy meter also includes voltage input end electricity
Road and current input terminal circuit, the voltage channel of the control source terminal circuit have three single ended voltage inputs:VAP,VBP,
VCP；Maximum input voltage of the single ended voltage input relative to VN be ± 0.5V, VxP and VN simulation maximum input level be ±
0.5V, the maximum common-mode signal of input is ± 25mV, wherein becoming a low current after the big resistance of 150K per phase voltage
Into in voltage transformer, the voltage transformer selects bright ZMPT101B, ZMPT101B input currents and output using Nanjing
The ratio of electric current is 2000:2000, subsequently into chip LM224, it is made up of inside LM224 two amplifiers.
4. intelligent electric energy meter as claimed in claim 3, it is characterised in that the current channel of the current input terminal circuit is four
Differential voltage is inputted:IAP and IBN, IBP and ICN, ICP and ICN and INP and INN, the maximum difference of control source pairing
Signal is ± 0.5V, and IxP is ± 25mV to IxN maximum analog signal level, and current transformer is from Nanjing Ze Ming companies
ZMCT118A, ZMCT118A specified input current are 5A, and output-current rating is 2.5mA.
5. intelligent electric energy meter as claimed in claim 1, it is characterised in that the real time clock circuit uses DS1302, described
Intelligent electric energy meter uses RS-485 serial communication modes, and the RS-485 interfaces Mulit-point Connection constitutes electricity by RS-485 buses
Energy table data collecting system, directly uses RS-485 driving chips, and multiple electric energy meters constitute communication network by twisted pair line connection.
6. intelligent electric energy meter as claimed in claim 1, it is characterised in that the RS-485 circuits use ADM2483, described
ADM2483 includes a triple channel isolator, a differential driver with ternary output and a difference inputted with tri-state
Receiver.
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