CN104251933A - Novel intelligent electric energy meter - Google Patents
Novel intelligent electric energy meter Download PDFInfo
- Publication number
- CN104251933A CN104251933A CN201310260355.XA CN201310260355A CN104251933A CN 104251933 A CN104251933 A CN 104251933A CN 201310260355 A CN201310260355 A CN 201310260355A CN 104251933 A CN104251933 A CN 104251933A
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- electric energy
- chip microcomputer
- energy meter
- novel intelligent
- frequency card
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Abstract
Disclosed in the invention is a novel intelligent electric energy meter comprising a single-chip microcomputer, an electric energy metering device, a memory, a direct-current power supply, a power monitor, a display, a real-time clock circuit, a load controller and a query key. The electric energy metering device, the memory, the direct-current power supply, the power monitor, the display, the real-time clock circuit, the load controller, and the query key are connected to the single-chip microcomputer. In addition, the novel intelligent electric energy meter also includes a radio frequency card; and the output terminal of the radio frequency card is connected with the output terminal of the single-chip microcomputer. Besides, the single-chip microcomputer is provided with an RS485 communication serial port. According to the invention, the novel intelligent electric energy meter adapts to the electric energy meter intelligentialization trend; advantages of non-contact property, passiveness, and information security of the RFID can be well reflected; the electricity sealing prevention effect is good; the meter reading way is advanced; and the IC card is not easy to damage and pollute.
Description
Technical field
The present invention relates to a kind of electric energy meter, particularly relate to a kind of novel intelligent electric energy meter.
Background technology
There is many defects in induction type electric energy meter and ordinary electronic formula electric energy meter, as function singleness, power-steeling preventing effect is poor, meter reading method is backward, the fragile pollution of IC-card etc., in order to adapt to the intelligentized trend of electric energy meter, radio-frequency (RF) identification (RFID) technology is applied to the transmission of information about power, embodies the advantages such as RFID contact-free, passive, information security better.REID is a kind of non-contact automatic identification technology, is automatically identify destination object by radiofrequency signal and obtain related data.Basic rfid system supports software and hardware three part by electronic tag (radio-frequency card), reader and application and forms.RFID label tag is made up of chip and antenna, and each label has unique electronic code.Different according to the mode sending radiofrequency signal, label is divided into again active and passive type two kinds.Active tag is powered by internal battery and is initiatively sent radiofrequency signal to read write line.Part electromagnetic energy, after receiving the electromagnetic wave signal that reader sends, is converted into the energy for oneself work thus makes response by passive label.Reader is responsible for reading signal to transmitted tag and accepting the response of label, decodes to the object id information of label, by other related information transmission on related for object id information label to main frame for process.RFID application supports the correlation function of the realization of software and hardware primary responsibility and enterprise or organizations.
Summary of the invention
Object of the present invention is just to provide a kind of novel intelligent electric energy meter that need not contact the transmission that just can realize information about power to solve the problem.
In order to achieve the above object, present invention employs following technical scheme:
The present invention includes single-chip microcomputer, electric energy metering machine, storer, direct supply, power supply monitor, display, real time clock circuit, load governor and inquiry button, described electric energy metering machine, described storer, described direct supply, described power supply monitor, described display, described real time clock circuit, described load governor and described inquiry button are all be connected on described single-chip microcomputer, also comprise radio-frequency card, the output terminal of described radio-frequency card is connected with the input end of described single-chip microcomputer, and described single-chip microcomputer is provided with RS485 communication serial port.
Further, described radio-frequency card is provided with FPDP, reset terminal, address latch port, data write end, digital independent end, described single-chip microcomputer is provided with programming address port and grounding ports, described FPDP is corresponding with described programming address port to be connected, and described reset terminal, described address latch port and, described data write holds and the corresponding and described programming address port of described digital independent end is connected.
Further, described radio-frequency card model be MFRC500 or other there is the model of identity function, described single-chip microcomputer model be MSP430 or other there is the model of identity function.
Beneficial effect of the present invention is:
The present invention has adapted to the intelligentized trend of electric energy meter, radio-frequency (RF) identification (RFID) technology is applied to the transmission of information about power, embody the advantage of RFID contact-free, passive, information security better, function ratio is more, power-steeling preventing effect is good, meter reading method is advanced, and IC-card is not easy to damage and pollutes.
Accompanying drawing explanation
Fig. 1 is structural principle block diagram of the present invention.
Fig. 2 is the connection sketch of radio-frequency card of the present invention and single-chip microcomputer.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described in detail:
As shown in Figure 1, the present invention includes single-chip microcomputer MSP430, electric energy metering machine ADE7755, storer, direct supply, power supply monitor, display led/LCD, real time clock circuit, load governor and inquiry button, electric energy metering machine ADE7755, storer, direct supply, power supply monitor, display led/LCD, real time clock circuit, load governor and inquiry button are all be connected on single-chip microcomputer MSP430, also comprise radio-frequency card MFRC500, the output terminal of described radio-frequency card MFRC500 is connected with the input end of described single-chip microcomputer MSP430, described single-chip microcomputer MSP430 is provided with RS485 communication serial port.
As shown in Figure 2, radio-frequency card MFRC500 is provided with FPDP D0 ~ D7, reset terminal RSTPD, address latch port ALE, data write end NWR, digital independent end NRD and port NCS, described single-chip microcomputer is provided with programming address port P6.0 ~ P6.7, programming address port P2.0, programming address port P1.4, programming address port P1.7, programming address port P1.6 and grounding ports GND, FPDP D0 ~ D7 is corresponding with programming address port P6.0 ~ P6.7 to be connected, reset terminal RSTPD is connected with programming address port P2.0, address latch port ALE is connected with programming address port P1.4, data write end NWR is connected with programming address port P1.7, digital independent end NRD is connected with programming address port P1.6, port NCS is connected with grounding ports GND.
As depicted in figs. 1 and 2, radio-frequency card model be MFRC500 or other there is the model of identity function, single-chip microcomputer model be MSP430 or other there is the model of identity function.
Principle of work of the present invention is: as shown in Figure 1, and electric energy metering machine ADE7755 gives single-chip microcomputer MSP430 process according to voltage, current input signal production electric flux pulse signal and current direction signal.Single-chip microcomputer MSP430 adds up electric pulse, calculates electricity and stores, and carries out subtraction process simultaneously, and judge whether alarm or power-off according to current rate to dump energy.Single-chip microcomputer MSP430 constantly reads clock, and determines the rate of current operation.Single-chip microcomputer MSP430 also monitors RS485 bus and infrared communication signal, receives or response command, carries out serial communication.In addition, ammeter is control relay state and the parameter such as cell voltage, power also, to abnomal condition alarm and record.Direct supply is for ensureing the normal operation of the electric energy meter when grid cut-off, and power supply supervision unit monitors the working condition of linear electric power network in real time.The break-make of spatial load forecasting part control load.The information interaction of electric energy meter and host computer adopts near infrared light telecommunication and long-range RS485 bus mode.Electric energy meter adopts button to realize the inquiry of key message.
As shown in Figure 2, radio-frequency card MFRC500 is applied to a member in 13.56MHz contactless communication in high integrated IC series.This IC series make use of advanced modulation and demodulation concept, fully-integrated all types of passive contactless communication mode and agreement at 13.56 mhz.Radio-frequency card MFRC500 supports the layer that IS014443A is all.Inner transmitter part does not need to increase active circuit just can the antenna (can reach 100mm) of Direct driver near operation distance, receiver part provides a firm and effective demodulation decoding circuit, for the transponder signal of ISO14443A compatibility.Numerical portion process ISO14443A frame and error-detecting (odd even and CRC).In addition, it also supports that quick CRYPTOI cryptographic algorithm is for verifying Ml team RE series of products.Parallel interface can be directly connected to any 8-bit microprocessor easily, provide great dirigibility to like this design of card reader terminal, applying RFID is the instrument that electric energy meter realizes pre-payment, and by RFID technique, we can realize the pre-payment of electric energy meter easily.Utilize radio-frequency card MFRC500 chip as reading value and depreciation in RFID.Because the bus of single-chip microcomputer MSP430 does not extend out, so can not using radio-frequency card MFRC500 directly as external memory operation.To this, the mode of emulation bus is adopted to communicate with MFRC500.Here select P6 mouth to be connected with the D0-D7 of radio-frequency card MFRC500, Pl.6 meets digital independent end NRD, and Pl.7 meets data write end NWR, Pl.4 and meets address latch end ALE, and P2.0 meets reset terminal RSTPD, and GND port connects NCS port.
Claims (3)
1. a novel intelligent electric energy meter, comprise single-chip microcomputer, electric energy metering machine, storer, direct supply, power supply monitor, display, real time clock circuit, load governor and inquiry button, described electric energy metering machine, described storer, described direct supply, described power supply monitor, described display, described real time clock circuit, described load governor and described inquiry button are all connected on described single-chip microcomputer, it is characterized in that: comprise radio-frequency card, the output terminal of described radio-frequency card is connected with the input end of described single-chip microcomputer, described single-chip microcomputer is provided with RS485 communication serial port.
2. novel intelligent electric energy meter according to claim 1, it is characterized in that: described radio-frequency card is provided with FPDP, reset terminal, address latch port, data write end, digital independent end, described single-chip microcomputer is provided with programming address port and grounding ports, described FPDP is corresponding with described programming address port to be connected, and described reset terminal, described address latch port and, described data write holds and the corresponding and described programming address port of described digital independent end is connected.
3. novel intelligent electric energy meter according to claim 1, is characterized in that: described radio-frequency card model be MFRC500 or other there is the model of identity function, described single-chip microcomputer model be MSP430 or other there is the model of identity function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310260355.XA CN104251933A (en) | 2013-06-26 | 2013-06-26 | Novel intelligent electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310260355.XA CN104251933A (en) | 2013-06-26 | 2013-06-26 | Novel intelligent electric energy meter |
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| CN104251933A true CN104251933A (en) | 2014-12-31 |
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| CN201310260355.XA Pending CN104251933A (en) | 2013-06-26 | 2013-06-26 | Novel intelligent electric energy meter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911345A (en) * | 2016-04-26 | 2016-08-31 | 上海电机学院 | Ammeter system capable of preventing power theft |
| CN109470917A (en) * | 2018-10-26 | 2019-03-15 | 哈尔滨电工仪表研究所有限公司 | A kind of integrated semi-active RFID intelligent electric energy meter device of PCB |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105911345A (en) * | 2016-04-26 | 2016-08-31 | 上海电机学院 | Ammeter system capable of preventing power theft |
| CN109470917A (en) * | 2018-10-26 | 2019-03-15 | 哈尔滨电工仪表研究所有限公司 | A kind of integrated semi-active RFID intelligent electric energy meter device of PCB |
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Application publication date: 20141231 |