CN210517902U

CN210517902U - Intelligent metering terminal based on GPRS

Info

Publication number: CN210517902U
Application number: CN201921832462.4U
Authority: CN
Inventors: 但琴; 吕阳
Original assignee: Chengdu Rester Technology Co ltd
Current assignee: Chengdu Rester Technology Co ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-05-12
Anticipated expiration: 2029-10-29

Abstract

The utility model discloses an intelligence measurement terminal based on GPRS, intelligence measurement terminal includes singlechip and the electric quantity metering module, data storage module and the power module who is connected with the singlechip, power module adopts lithium cell power supply, just the singlechip still is connected with the GPRS module. The utility model discloses a set up the GPRS module and realize data communication to with the lithium cell cooperation, realize realizing the transmission of data under the outage condition.

Description

Intelligent metering terminal based on GPRS

Technical Field

The utility model relates to an intelligence metering device, concretely relates to intelligence measurement terminal based on GPRS.

Background

With the rapid development of networks and the demand for information management and technical support, remote operation and control are becoming more and more important in work. The remote office not only relieves the urban traffic condition and reduces the environmental pollution, but also avoids the trouble of people on the way of going to work and leaving work, and can improve the working efficiency and the working interest of enterprise employees.

In a remote communication system, a manual meter reading mode is usually adopted to measure one path of power distribution independently, part of the power distribution system comprises a remote data receiving unit, but the remote data receiving unit is only used for judging power consumption and has no control function, when a line needs to be closed or opened, workers need to go to the field for processing, and communication base station sites are usually scattered, so that a large amount of manpower and material resources can be consumed. With the integration of three networks of a communication system, the newly-built base station realizes direct current monitoring and intelligent communication management, but the shared base station or a relatively remote independent base station is still in a manual maintenance state, and intelligent electric quantity monitoring management is still blank. And data transmission of the current intelligent metering terminal is realized through an RS485 module, the communication mode needs cables, and once power failure occurs, data cannot be transmitted.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can carry out data transmission's intelligent measurement terminal based on GPRS under the outage.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

intelligence measurement terminal based on GPRS, intelligence measurement terminal includes singlechip and the electric quantity metering module, data storage module and the power module who is connected with the singlechip, power module adopts lithium cell power supply, just the singlechip still is connected with the GPRS module.

Further, the power module comprises a charging circuit module, a lithium battery, a power management module and a lithium battery voltage detection module, the charging circuit module, the lithium battery, the power management module and the single chip microcomputer are sequentially connected, and the lithium battery voltage detection module is respectively connected with the lithium battery and the single chip microcomputer.

The utility model discloses a set up the GPRS module and realize data communication to with the lithium cell cooperation, realize realizing the transmission of data under the outage condition.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is the utility model discloses an intelligent metering terminal schematic diagram.

Fig. 3 is a schematic diagram of the single chip microcomputer of the present invention.

Fig. 4 is a schematic diagram of the electric quantity metering module chip of the present invention.

Fig. 5 is a schematic diagram of the data storage module of the present invention.

Fig. 6 is the structural schematic diagram of the alarm information monitoring module of the present invention.

Fig. 7 is a schematic diagram of the status detection module of the present invention.

Fig. 8 is a schematic diagram of the switching value detecting module of the present invention.

Fig. 9 is a schematic diagram of a GPRS module according to the present invention.

Fig. 10 is a schematic diagram of the RS485 module of the present invention.

Detailed Description

As shown in fig. 1, in the intelligent metering terminal based on GPRS provided in this embodiment, the intelligent metering terminal includes a single chip microcomputer, and an electric quantity metering module, a data storage module, and a power module connected to the single chip microcomputer, where the power module is powered by a lithium battery, and the single chip microcomputer is further connected to a GPRS module; data communication is realized by arranging the GPRS module, and the GPRS module is matched with the lithium battery to realize data transmission under the condition of power failure.

The power module includes lithium cell, charging circuit module, lithium cell voltage detection module and power management module, charging circuit module one end is connected with the lithium cell, and the other end and commercial power connection realize giving lithium cell charging, and is the same with prior art's adapter circuit principle, and lithium cell voltage detection module is connected with lithium cell and singlechip for give the singlechip with gathering lithium cell voltage, real-time detection lithium cell voltage, the realization is reported an emergency and asked for help or increased vigilance when low voltage, power management module is connected with lithium cell and singlechip, realizes the required operating voltage such as voltage conversion singlechip of lithium cell. The embodiment adopts the lithium battery for power supply, and can ensure that data is sent through the GPRS module under the condition of power failure.

The GPRS module is implemented by using the existing GPRS communication technology, specifically, by using a GA6-B chip, and its circuit is shown in fig. 9, where the GPRS module performs data downlink transmission: maximum 85.6kbps, data uplink transmission: the maximum of 42.8kbps, a communication interface protocol should meet the relevant requirements of DL/T645-2007 multifunctional electric energy meter communication protocol, and electric quantity data and alarm information can be sent to a server platform through a GPRS module to realize monitoring data.

The intelligent metering terminal of this embodiment can adopt the metering terminal of prior art, also can adopt following intelligent terminal, as shown in fig. 2, the metering terminal includes singlechip, electric quantity metering module, data storage module, on-off control module, power module, warning information monitoring module, human-computer interaction module and communication module.

The single chip microcomputer is used as an operation and control core of the terminal system and is a final execution unit for information processing and program operation; the system is connected with an electric quantity metering module, a data storage module, a switch control module, a power supply module, an alarm information monitoring module, a man-machine interaction module and a communication module to realize the operation and control of the system, specifically, the embodiment adopts an STC8 series single chip microcomputer as an operation and control core, the circuit diagram structure is shown in figure 3, the STC8 series single chip microcomputer is the fastest 8051 single chip microcomputer at present, an external crystal oscillator and external reset are not needed, the anti-interference capability is strong, the speed is high, and the power consumption is low; compared with the traditional 8051 single chip microcomputer, the STC8 series single chip microcomputer has the operation speed which is about 12 times faster, all 111 instructions are sequentially executed, 1944 clocks are needed in the traditional 8051, but the STC8 series single chip microcomputer can be completed by only 147 clocks; the programming program of the STC8 series single-chip microcomputer is basically the same as that of the 51 single-chip microcomputer, and the functions are convenient at night; therefore, the series of single-chip microcomputers are selected by the single-chip microcomputer.

The electric quantity metering module is connected with the singlechip, realizes the function of electric current, voltage acquisition and electric energy measurement, the electric quantity metering module includes the electric quantity metering module that 4 structures are the same, specifically adopts metering chip RN8302B and voltage transformer, current transformer to realize, the structure of RN8302B chip indicates as shown in figure 4, RN8302B chip is the multi-functional anti-electricity-theft metering chip of three-phase, adopts 4 these chips to constitute 4 independent metering function of way, can the outer commercial power of three-phase introduce when monitoring base station power consumption, the outer commercial power of single-phase is introduced and the oil engine power is introduced, all can realize independent electric quantity and calculate, realize the monitoring function to voltage, frequency, electric current, active power, reactive power, power factor, active electric quantity and reactive electric quantity of whole power supply system. The digital signal processing core in the RN8302B chip can be connected with the STC8 series single chip microcomputer through an SPI interface, and detection data can be sent to the single chip microcomputer. The RN8302B chip still is connected with voltage transformer and current transformer, and voltage transformer and current transformer are connected with the power supply line, realize the voltage and the current acquisition of front end, and the voltage processing that the RN8302B chip was gathered the front end become effective current value, magnitude of voltage and power value etc. and the rethread SPI interface sends for the singlechip.

The data storage module is connected with the single chip microcomputer and used for storing collected data such as power supply and current, the data storage module can adopt SDRAM or Flash, and the like, specifically, SPI Flash is adopted for data storage in the embodiment, the circuit principle is shown in figure 5, the data storage is stable and reliable, and the data storage cannot be lost or damaged due to field error operation, error monitoring commands and the like. After the working power supply is powered off, various historical data and set parameters are permanently stored and are not lost. The data storage module of this embodiment further stores historical electric quantity data and historical warning information, the storage capacity can be selected to be different according to a usage scenario or an approximate data quantity, the minimum capacity is 16Mbyte, the historical electric quantity data is daily used electric quantity data, namely electric quantity obtained at zero point every day, and the storage time length of the stored historical electric quantity data is at least more than 120 days. The historical alarm information is stored in a real-time storage mode, and the storage quantity is more than 1000. The historical electric quantity data and the historical alarm information are stored by adopting a first-in first-out principle.

The warning information monitoring module is connected with the singlechip, realizes the collection of warning information, as shown in fig. 6, the warning information monitoring module includes state detection module and switching value detection module be connected with the singlechip and with the DI interface that state detection module and switching value detection module are connected, the DI interface with the equipment such as commercial power, oil engine be connected, acquire the state of commercial power and oil engine, the state is reported an emergency and asked for help or increased vigilance including lightning protection air break and is reported an emergency and ask for help or increased vigilance, commercial power return circuit power supply state, commercial power return circuit on-off state, oil engine return circuit on-off state, every state needs a DI interface, consequently, the DI interface needs to include 5 at least, in the reality, is provided with 6, leaves a redundant oil. The lightning protection air-break alarm, the commercial power loop switching state and the oil engine loop switching state are detected through the switching state module, the switching state module circuit is shown in fig. 7, the commercial power loop power supply state and the oil engine loop power supply state are obtained through the state detection module, and the state detection module circuit is shown in fig. 8.

The man-machine interaction module is connected with the singlechip, specifically, including display module and the display screen of being connected with display module, display module is connected with the singlechip, realizes data and warning information's demonstration, the display screen adopts full-color touch liquid crystal display, and liquid crystal display is directly perceived, clear, and the characters part adopts simplified chinese character, and data display adopts national legal measurement unit, if: kW, kvar, kWh, kvarh, V, A, etc.; the display screen has the advantages that the voltage display precision is 0.01V, the current display precision is 0.001A, the power factor display precision is 0.001, the active power display precision is 0.001kW, the reactive power display precision is 0.001kvar, the electric energy display precision is 0.01kWh/kvarh, the display contents comprise real-time data of each monitoring circuit, real-time alarms (such as self fault of equipment, voltage/frequency out-of-limit of a power supply system and commercial power phase failure), related set parameters (communication parameters such as address, baud rate and verification mode and alarm threshold parameters such as voltage and upper and lower frequency limits) and company information, the display screen has the backlight display function, and the backlight display is automatically turned off within 30s (the automatic backlight turn-off time is adjustable) after the operation is finished.

Communication module includes GPRS module and RS485 module, realizes multi-functional signal transmission through two communications, avoids a trouble, leads to the phenomenon of the unable transmission of signal, the GPRS module adopts current GPRS communication technology to realize, specifically, adopts GA6-B chip to realize, and its circuit is as shown in FIG. 9, and GPRS module data downlink transmits: maximum 85.6kbps, data uplink transmission: the maximum of 42.8kbps, a communication interface protocol should meet the relevant requirements of DL/T645-2007 multifunctional electric energy meter communication protocol, and electric quantity data and alarm information can be sent to a server platform through a GPRS module to realize monitoring data. The RS485 module is also used for data transmission, but the mode can be realized only when the whole network is powered on, once the data cannot be transmitted due to intermediate power failure, the circuit structure is shown in FIG. 10, and the communication baud rate of the RS485 module is 9600 by default.

The switch control module is connected with the single chip microcomputer and used for being connected with a load to achieve on-off control of the load, the load is a generator or an oil engine, and the on-off control of the oil engine and the generator is achieved through control.

The above is only the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and the utility model should be covered in the protection scope of the present invention.

Claims

1. GPRS-based intelligent metering terminal, intelligent metering terminal includes singlechip and the electric quantity metering module, data storage module and the power module who is connected with the singlechip, its characterized in that: the power module adopts the lithium cell power supply, just the singlechip still is connected with the GPRS module.

2. A GPRS based smart metering terminal as claimed in claim 1, characterized in that: the power module comprises a charging circuit module, a lithium battery, a power management module and a lithium battery voltage detection module, wherein the charging circuit module, the lithium battery, the power management module and the single chip microcomputer are sequentially connected, and the lithium battery voltage detection module is respectively connected with the lithium battery and the single chip microcomputer.