CN110568258A - A smart metering terminal - Google Patents

Abstract

The invention discloses an intelligent metering terminal which comprises a single chip microcomputer, and an electric quantity metering module, a data storage module, an alarm information monitoring module, a man-machine interaction module, a communication module and a power supply module which are connected with the single chip microcomputer, wherein the communication module comprises an RS485 module and a GPRS module, and the power supply module adopts a lithium battery for power supply. The invention realizes timely sending of alarm information under the condition of power failure and quickens message transmission by combining the GPRS module and the lithium battery power supply and metering terminal.

Description

A smart metering terminal

technical field

The invention relates to an intelligent metering device, in particular to an intelligent metering terminal capable of measuring electricity and cooperating with a remote platform to realize remote control.

Background technique

With the rapid development of the network and the demand for information management and technical support, remote operation and control are becoming more and more important in the work. Telecommuting not only alleviates urban traffic conditions and reduces environmental pollution, but also saves people from the hardships of commuting to and from get off work, which can improve the work efficiency and work interest of enterprise employees.

In the remote communication system, the manual meter reading method is usually used to measure the power distribution alone. Some power distribution systems include remote data receiving units, but they are only used for power consumption judgment and have no control function. When the line needs to be closed or opened When it happens, the staff needs to go to the scene to deal with it, and the communication base station sites are usually scattered, so it will consume a lot of manpower and material resources. With the three-network integration of the communication system, the new base station has realized DC monitoring and intelligent communication management. However, for shared base stations or relatively remote independent base stations, they are still in the state of manual maintenance, and intelligent power monitoring management is still blank.

Contents of the invention

The purpose of the present invention is to provide an intelligent metering terminal capable of detecting three-phase electricity and monitoring and alarming a power supply device.

To achieve the above object, the present invention adopts the following technical solutions:

An intelligent metering terminal includes a single-chip microcomputer, and a power metering module connected to the single-chip microcomputer, a data storage module, an alarm information monitoring module, a human-computer interaction module, a communication module and a power supply module, and the communication module includes an RS485 module and a GPRS module. The above power module is powered by a lithium battery.

Further, the electricity metering module is provided with four electricity metering circuits with the same structure, and the electricity metering circuits adopt RN8032B metering chip.

Further, the data storage module adopts SPI FLASH.

Further, the alarm information monitoring module includes a state detection module and a switch value detection module connected to the single chip microcomputer, and the state detection module and the switch value detection module are provided with a DI interface connected to the power supply device.

Further, the human-computer interaction module is realized by using a touch screen.

Further, the power supply module includes 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, a power management module, and a single-chip microcomputer are connected in sequence, and the lithium battery voltage detection module is respectively Connect with lithium battery and microcontroller.

The present invention has the following beneficial effects:

(1) By setting up multi-channel power metering modules, the independent metering of simultaneous power supply to multiple power supply devices can be realized, and the applicability of the devices can be improved;

(2) Realize data communication by setting GPRS module, and cooperate with lithium battery to realize data intercommunication in case of power failure;

(3) By setting multiple state detection and switch detection, the state and switch value detection of power supply systems such as diesel generators and commercial power can be realized, and the remote control can be realized by cooperating with GPRS to reduce labor force.

Description of drawings

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

Fig. 2 is a schematic diagram of the single-chip microcomputer of the present invention.

Fig. 3 is a schematic diagram of the power metering module chip of the present invention.

Fig. 4 is a schematic diagram of the data storage module of the present invention.

Fig. 5 is a schematic structural diagram of the alarm information monitoring module of the present invention.

FIG. 6 is a schematic diagram of a state detection module of the present invention.

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

Fig. 8 is a schematic diagram of the GPRS module of the present invention.

Fig. 9 is a schematic diagram of the RS485 module of the present invention.

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

Detailed ways

As shown in Figure 1 and Figure 2, this embodiment provides.

As shown in Figure 1, a new type of smart metering terminal includes a single-chip microcomputer, a power metering module, a data storage module, a switch control module, a power supply module, an alarm information monitoring module, a human-computer interaction module and a communication module.

The single-chip microcomputer is used as the calculation and control core of the terminal system, and is the final execution unit of information processing and program operation; it interacts with the power metering module, data storage module, switch control module, power supply module, alarm information monitoring module, human-computer interaction The module and the communication module are all connected to realize the calculation and control of the system. Specifically, this embodiment uses the STC8 series single-chip microcomputer as the core of calculation and control. Its circuit diagram structure is shown in Figure 2. The STC8 series single-chip microcomputer is currently the fastest 8051 Single-chip microcomputer, does not need external crystal oscillator and external reset, has strong anti-interference ability, and is fast, low power consumption; Compared with the traditional 8051 single-chip microcomputer, the operation speed of STC8 series single-chip microcomputer is about 12 times faster, in order To execute all 111 instructions, the traditional 8051 needs 1944 clocks, but the STC8 series single-chip microcomputer only needs 147 clocks to complete; the programming of the STC8 series single-chip microcomputer is basically the same as that of the 51 single-chip microcomputer, and the function is convenient at night; so the application of this application Single-chip microcomputer choose this series of single-chip microcomputer.

The power metering module is connected with the single-chip microcomputer to realize the functions of current and voltage acquisition and electric energy metering. The power metering module includes 4 power metering modules with the same structure, which are specifically implemented by using a metering chip RN8302B, a voltage transformer, and a current transformer. The schematic structure of the RN8302B chip is shown in Figure 3. The RN8302B chip is a three-phase multi-functional anti-stealing electricity metering chip. Four such chips are used to form four independent metering functions. When monitoring the power consumption of the base station, three-phase The introduction of mains power, the introduction of single-phase external mains power and the introduction of oil generator power supply can realize independent power calculation, and realize the voltage, frequency, current, active power, reactive power, power factor, active power and reactive power of the entire power supply system. Power monitoring function. The digital signal processing core in the RN8302B chip can be connected with the STC8 series single-chip microcomputer through the SPI interface, so as to realize sending the detection data to the single-chip microcomputer. The RN8302B chip is also connected with a voltage transformer and a current transformer, and the voltage transformer and the current transformer are connected to the power supply line to realize the voltage and current collection of the front end, and the RN8302B chip processes the voltage and voltage collected by the front end into an effective current value , voltage value and power value, etc., and then send it to the microcontroller through the SPI interface.

Described data storage module is connected with single-chip microcomputer, is used for storing data such as power supply and electric current of collection, and described data storage module can adopt SDRAM or Flash etc., specifically, present embodiment adopts SPI Flash to carry out data storage, and its circuit principle is as follows As shown in Figure 4, the data storage is stable and reliable, and will not be lost or damaged due to wrong operations on site, wrong monitoring commands and other reasons. After the working power is turned off, all kinds of historical data and set parameters are permanently saved and will not be lost. The data storage module of this embodiment also stores historical power data and historical alarm information. The storage capacity can be selected according to the scene of use or the approximate amount of data. The minimum capacity is 16Mbyte, and the historical power data is the daily power consumption data. That is, the power obtained at zero o'clock every day, and the storage period of historical power data is at least 120 days. The historical alarm information is stored in real-time storage mode, and the storage quantity is more than 1000. The storage of historical power data and historical alarm information adopts the principle of first in first out.

Described warning information monitoring module is connected with single-chip microcomputer, realizes the collection of warning information, as shown in Figure 5, described warning information monitoring module comprises the state detection module and switch quantity detection module that are connected with singlechip and with state detection module and switch quantity detection The DI interface connected to the module, the connection between the DI interface and the mains, oil generator and other equipment, obtains the status of the mains and oil generator. The state of the switch, the power supply state of the oil generator circuit, and the switch state of the oil generator circuit require a DI interface for each state. Therefore, the DI interface must include at least 5. In practice, there are 6 DI interfaces, and one is reserved for redundancy. The above-mentioned lightning protection circuit breaker disconnection alarm, mains circuit switch state and oil machine circuit switch state are detected by the switch state module. The circuit of the switch state module is shown in Figure 6. Obtained by the state detection module, the state detection module circuit is shown in Figure 7.

The human-computer interaction module is connected with the single-chip microcomputer, specifically, includes a display module and a display screen connected with the display module, the display module is connected with the single-chip microcomputer to realize the display of data and alarm information, and the display screen adopts a full-color touch LCD Display screen, liquid crystal display is intuitive and clear, the text part adopts simplified Chinese characters, and the data display adopts national legal measurement units, such as: kW, kvar, kWh, kvarh, V, A, etc.; the voltage display accuracy is 0.01V, and the current display accuracy is 0.001 A. The display accuracy of power factor is 0.001, the display accuracy of active power is 0.001kW, the display accuracy of reactive power is 0.001kvar, and the display accuracy of electric energy is 0.01kWh/kvarh. The display content includes real-time data and real-time alarms of each monitoring circuit (such as equipment Self-fault, power supply system voltage/frequency limit, mains power phase loss), related setting parameters (communication parameters such as address, baud rate, verification method, alarm threshold parameters such as voltage, upper and lower limits of frequency) and company information, The display screen has a backlight display function, and the backlight display is automatically turned off within 30s (automatic backlight off time is adjustable) after the operation is completed.

Described communication module comprises GPRS module and RS485 module, realizes multi-functional signal transmission through double communication, avoids the phenomenon that one breaks down, causes the phenomenon that signal cannot be transmitted, and described GPRS module adopts existing GPRS communication technology to realize, specifically, adopts Realized by GA6-B chip, its circuit is shown in Figure 8, GPRS module data downlink transmission: maximum 85.6kbps, data uplink transmission: maximum 42.8kbps, communication interface protocol should meet DL/T645-2007 "Multifunctional Energy Meter Communication Protocol According to the relevant requirements of ", the power data and alarm information can be sent to the server platform through the GPRS module to realize the monitoring data. The RS485 module is also used for data transmission, but this method must be realized when the entire network is powered on. Once it is found that the power is cut off in the middle, the data cannot be transmitted. Its circuit structure is shown in Figure 9. The communication of the RS485 module The baud rate is 9600 by default.

The power supply module includes a lithium battery, a charging circuit module, a lithium battery voltage detection module, and a power management module. Lithium battery charging is the same as the adapter circuit principle of the prior art. The lithium battery voltage detection module is connected with the lithium battery and the single-chip microcomputer, and is used to send the collected lithium battery voltage to the single-chip microcomputer, detect the lithium battery voltage in real time, and realize an alarm when the voltage is too low. The power management module is connected with the lithium battery and the single-chip microcomputer to realize the voltage conversion of the lithium battery to the working voltage required by the single-chip microcomputer and the like. This embodiment uses a lithium battery for power supply, which can ensure that the alarm information is sent through the GPRS module in the event of a power failure. The alarm information includes alarms for high AC voltage, high AC voltage, low AC voltage, AC phase loss, AC input power failure, lightning protection device failure, lightning protection circuit breaker disconnection, and oil generator power generation Status alarms, the AC voltage over-high alarm, AC over-high Disconnection alarms and diesel generator status alarms are collected through the DI interface.

The switch control module is connected with the single-chip microcomputer, and is used to connect the load to realize the switch control of the load. The load in this embodiment is a generator or an oil generator, and the oil generator and the generator are controlled to be turned on or off.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any transformation and replacement based on the technical solutions and inventive concepts provided by the present invention should be covered by the scope of protection of the present invention Inside.

Claims (6)

1. A kind of intelligent metering terminal, it is characterized in that: comprise single-chip microcomputer, and the electricity metering module that is connected with single-chip microcomputer, data storage module, alarm information monitoring module, human-computer interaction module, communication module and power supply module, described communication module comprises RS485 module and the GPRS module, and the power module is powered by a lithium battery. 2 . The smart metering terminal according to claim 1 , wherein the power metering module is provided with four power metering circuits with the same structure, and the power metering circuits use RN8032B metering chips. 3. A smart metering terminal according to claim 1, characterized in that: said data storage module adopts SPIFLASH. 4. A kind of intelligent metering terminal according to claim 1, characterized in that: the alarm information monitoring module includes a state detection module and a switching value detection module connected to the single-chip microcomputer, and the state detection module and the switching value detection module There is a DI interface connected to the power supply device. 5. An intelligent metering terminal according to claim 1, characterized in that: the human-computer interaction module is realized by a touch screen. 6. A kind of smart metering terminal according to claim 1, characterized in that: said power supply module comprises a charging circuit module, a lithium battery, a power management module and a lithium battery voltage detection module, said charging circuit module, a lithium battery, The power management module is connected to the single-chip microcomputer in sequence, and the lithium battery voltage detection module is connected to the lithium battery and the single-chip microcomputer respectively.