CN209764929U - Single-phase GPRS/4G remote cost control intelligent electric energy meter - Google Patents

Abstract

The utility model discloses a long-range accuse intelligent electric energy meter that takes of single-phase GPRS 4G relates to the electric energy metering device field, including the control unit, GPRS 4G module, electrical unit, metering unit and the display element of integration on the PCB board. The utility model discloses a single-phase GPRS/4G remote cost control intelligent electric energy meter solves the problems that the traditional 485 electric energy meter or PLC carrier electric energy meter has the problems that the wiring of the communication network is difficult, the wiring cost is high, the electromagnetic interference of the network seriously affects the communication, etc. by the method of adding the GPRS/4G communication module under the condition of not affecting the correct metering of the electric energy meter to the electric energy; the problems of instability, poor signal and the like of wireless communication are solved by utilizing the reliable communication capability and the network coverage capability of the 4G public network, and a brand-new, safe and reliable meter reading scheme is provided for customers.

Description

Single-phase GPRS/4G remote cost control intelligent electric energy meter

Technical Field

the utility model relates to an electric energy metering device field, concretely relates to single-phase GPRS/4G remote fee accuse intelligent electric energy meter.

background

In order to solve the trouble of reading meter one by one, remote control type electric meters are commonly used at present; along with the continuous popularization of the use of the remote intelligent electric energy meter, the remote communication function of the electric energy meter has a decisive role in the timeliness and the accuracy of meter data reading. At present, most of the communication schemes adopt schemes such as 485 buses or Power Line Carriers (PLC) and the like for solving the problems, and the schemes really have good superiority under the conditions that the installation positions of meters are concentrated and the quality of a power grid in an installation area is optimized and stable; however, for electric meters with excessively dispersed installation places, a 485 bus scheme is adopted, so that the wiring cost is high, and the operation and maintenance cost is also high; if the PLC scheme is adopted, the laying cost of a special communication line can be saved, but the utilization rate of data acquisition equipment is low, the communication quality is reduced due to factors such as electromagnetic interference of a power transmission network and the like, and the reading/control experience of the meter is seriously influenced.

In the prior art, the GPRS/4G module is additionally arranged in the intelligent electric energy meter to realize remote fee control, but the prior scheme is not mature enough, cannot give consideration to the real-time performance and the accuracy of the communication between the electric meter metering transmission and the GPRS/4G module, and cannot ensure the communication safety in the special information metering tool of the electric meter.

SUMMERY OF THE UTILITY MODEL

To the defect that exists among the prior art, the utility model aims to provide a single-phase GPRS 4G takes accuse intelligent electric energy meter remotely solves current long-range electric energy meter and walks that the line is with high costs, walks the line difficulty when installing the ammeter additional, and the electromagnetic interference of network seriously influences the problem of communication.

In order to achieve the above purpose, the utility model adopts the technical proposal that:

The utility model provides a single-phase GPRS/4G remote fee control intelligent electric energy meter, includes the control unit, GPRS/4G module, electrical unit, measurement unit and the display element of integration on the PCB board, its characterized in that: the GPRS/4G module, the metering unit and the display unit are in signal connection with the control unit, and simultaneously,

The input end of the metering unit is connected with the current sampling circuit and the voltage sampling circuit, and the output end of the metering unit is in signal connection with the control unit and is used for metering electric energy of input zero line current, live line current and voltage and converting the electric energy into electric energy pulses;

The power supply unit acquires electric energy from the measuring circuit and supplies power to each module of the electric energy meter; the control unit processes the electric energy pulse acquired from the metering unit and transmits the electric energy pulse to the GPRS/4G module, and the electric energy pulse is uploaded to the master station through the GPRS/4G module.

On the basis of the technical scheme, the magnetic protection relay further comprises a relay unit, wherein the relay unit is a magnetic protection relay, coils of the magnetic protection relay are communicated in the forward direction and are disconnected in the reverse direction, and contacts are kept by permanent magnets.

On the basis of the technical scheme, the safety protection device further comprises an embedded safety control module, and the safety chip is packaged on the PCB in a dual in-line mode.

On the basis of the technical scheme, the device further comprises a data storage unit, and the data storage unit is in signal connection with the control unit.

On the basis of the technical scheme, the power supply unit comprises three 2VA/3 windings, the output of the first winding is 9V/20mA which is supplied to the metering unit, the output of one winding is 9V/50mA which is supplied to the RS485 circuit, the output of one winding is 12V/400mA which is supplied to the single chip microcomputer circuit, and the rectified voltage is directly sent to the relay driving circuit.

On the basis of the technical scheme, the GPRS/4G module comprises a 4G main module, a UART/serial port level conversion circuit, a VCAP circuit, a startup and shutdown control circuit, a SIM card interface circuit and a main antenna, wherein the UART/serial port level conversion circuit, the VCAP circuit, the startup and shutdown control circuit, the SIM card interface circuit and the main antenna are connected with the 4G main module; the UART/serial port level conversion circuit is used for converting the communication level between the control unit and the 4G main module; the switch control circuit is used for receiving a switch control signal issued by the control unit and transmitting the switch control signal to the 4G main module; the VCAP circuit is used for ensuring the voltage inside the 4G main module to be stable; the SIM card interface circuit is used for reading the working information of the SIM and transmitting the working information to the 4G main module; the 4G main module uploads the acquired data of the control unit to the main station through the main antenna in a 4G communication mode, or receives the data sent by the main station and then transmits the data to the control unit.

On the basis of the technical scheme, an ESD protection device is arranged on the SIM card interface circuit.

On the basis of the technical scheme, the GPRS/4G module is connected with a GPRS/4G module power supply circuit, and the voltage output of the GPRS/4G module power supply circuit has enabling control.

On the basis of the technical scheme, the GPRS/4G module comprises a locally-arranged communication serial port which is in communication connection with the handheld device or the computer

On the basis of the technical scheme, a photoelectric isolator is arranged on a signal transmission line between the control unit and the metering unit, and a thermistor is connected in series on a measuring circuit connected to the power supply unit.

Compared with the prior art, the utility model has the advantages of:

(1) The utility model discloses a single-phase GPRS/4G remote fee-control intelligent electric energy meter solves the problems that the traditional 485 electric energy meter or PLC carrier electric energy meter has the problems that the wiring of the communication network is difficult, the wiring cost is high, and the electromagnetic interference of the network seriously affects the communication by the method of adding the GPRS/4G communication module under the condition of not affecting the correct metering of the electric energy meter to the electric energy; the problems of instability, poor signal and the like of wireless communication are solved by utilizing the reliable communication capability and the network coverage capability of the 4G public network, and a brand-new, safe and reliable meter reading scheme is provided for customers.

(2) The utility model discloses a single-phase GPRS/4G remote cost control intelligent electric energy meter guarantees security, correctness and real-time of wireless communication data through encryption algorithm to GPRS/4G wireless communication between the electric energy meter and the collector; meanwhile, the electric energy surface plate has the output interface almost consistent with that of the traditional communication panel through the adaptive improvement of the structure, so that the adaptability of the whole module to be matched with various electric energy meters is greatly enhanced.

(3) In the software control process of the single-phase GPRS/4G remote fee-control intelligent electric energy meter, the core MCU of the electric energy meter can realize the data receiving and sending control of the GPRS/4G communication module only by utilizing a plurality of groups of simple control instructions through the serial port interface; the GPRS/4G communication module is also provided with a local communication serial port, and the operation parameters of the module can be modified by the handheld device or the PC through the interface, so that the remote flexible control of the electric energy meter is realized.

(4) In the single-phase GPRS/4G remote cost control intelligent electric energy meter, the circuit structure of the GPRS/4G module and the power supply circuit thereof is improved and adjusted, so that the GPRS/4G module can stably work in the environments with large current change, complex signal environment and the like, such as brake opening and closing; the specific higher safety requirement of the electricity charge signal is guaranteed by the specific safety guarantee module, and the problems that signal transmission interference is large, application scene function matching is not corresponding, signal transmission safety is not high and the like when the common GPRS/4G module is applied to the specific environment of the intelligent electric meter are solved.

drawings

FIG. 1 is a schematic block diagram of a single-phase GPRS/4G remote cost-control intelligent electric energy meter according to an embodiment of the present invention;

FIG. 2 is a block diagram of the hardware connection between the GPRS/4G module and the single-chip microcomputer in the single-phase GPRS/4G remote cost control intelligent electric energy meter according to the embodiment of the present invention;

FIG. 3 is a GPRS/4G module power supply circuit diagram of the single-phase GPRS/4G remote cost control intelligent electric energy meter according to the embodiment of the present invention;

fig. 4 is a flow chart of the working process of the single-phase GPRS/4G remote fee-controlled intelligent electric energy meter in the power grid according to the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Referring to fig. 1, an embodiment of the present invention provides a single-phase GPRS/4G remote fee-control intelligent electric energy meter, including a control unit, a GPRS/4G module, a power supply unit, a metering unit and a display unit integrated on a PCB board, wherein the GPRS/4G module, the metering unit and the display unit are all connected to the control unit via signals, and simultaneously, an input end of the metering unit is connected to a current sampling circuit and a voltage sampling circuit, and an output end of the metering unit is connected to the control unit via signals, and is used for measuring electric energy of input zero line current, live line current and voltage, converting the electric energy into electric energy pulses, and simultaneously sending real-time voltage, current, power factor and the like to the control unit; the power supply unit acquires electric energy from the measuring circuit and supplies power to each module of the electric energy meter; the control unit processes the data such as the electric energy pulse, the real-time voltage, the current, the power factor and the like acquired from the metering unit, transmits the data to the GPRS/4G module, and uploads the data to the main station through the GPRS/4G module.

In one embodiment, the single-phase GPRS/4G remote cost control intelligent electric energy meter comprises a display unit (comprising a liquid crystal screen and an LED lamp), a metering unit, an ESAM module, a relay, a GPRS/4G module, a shell and the like, wherein the control unit, the GPRS/4G module, the metering unit and the liquid crystal screen display unit are integrated on a PCB, and the whole PCB is arranged in a set of plastic electric meter shell and fixed by self-tapping screws.

the utility model discloses single-phase GPRS/4G remote expense accuse intelligent ammeter hardware design is based on embedded Linux system, is a perfect minimum processing system, has high reliability, supports two kinds of communication methods of TCP and UDP, and every way connection supports 10KB serial ports data cache, and the module can initiate the link and build the chain action automatically when connecting abnormal interruption, ensures the unblocked of network link; each unit can set the communication parameters of the module and select the remote mode (transparent transmission mode or active uploading mode) of the module through a local serial port, and can also issue related communication and operation parameter modification instructions to the units by the platform in a chain establishing state, so that remote flexible control is realized.

In a preferred embodiment, the selection, specific connection relationship and implementation functions of each constituent unit/module are as follows:

The metering unit can be a metering circuit, the input end of the metering unit is connected with the current sampling circuit and the voltage sampling circuit, and the output end of the metering unit is in signal connection with the control unit and is used for metering the electric energy of the input zero line current, the input live line current and the input voltage, converting the electric energy into electric energy pulse and metering the forward electric energy of the reverse circuit. In this embodiment, the circuit takes RN8209 as the core, and simultaneously sends real-time power and power factor to the electric meter.

the control unit can be a single chip microcomputer, is the core of the single-phase GPRS/4G remote cost control intelligent electric energy meter in the embodiment of the invention, is internally provided with an XT crystal clock oscillation circuit of 4MHz and a hardware watchdog, and adopts a time division multiplexing technology on hardware according to requirements to realize calculation and control.

The display unit can be specifically an LCD display, a corresponding circuit, an LED signal lamp and other display parts, the LCD display is selected in the embodiment and is directly driven and displayed through the single chip microcomputer, and the contents such as the residual electric quantity, the accumulated electric quantity, the current power, the communication state, the electric meter working state and the like of the electric energy meter can be displayed.

The data storage unit comprises a Microchip E2ROM24LC256 which can be erased and written 1000 ten thousand times and is used for storing data and states such as electric charge, electric quantity, serial numbers and the like transmitted by the control unit and providing corresponding data and states stored by the control unit when receiving a calling signal of the control unit.

And the power supply unit specifically comprises a power supply circuit and a power supply transformer, wherein in one embodiment, the power supply transformer adopts three 2VA/3 windings, one winding outputs 9V/20mA to be supplied to the metering circuit, one winding outputs 9V/50mA to be supplied to the RS485 circuit, one winding outputs 12V/400mA to be supplied to the singlechip circuit, and the rectified voltage is directly sent to the relay drive circuit. The isolation voltage between the primary winding and the single chip microcomputer winding is larger than 4000V, the isolation voltage between the metering winding and the single chip microcomputer winding is larger than 4000V, the isolation voltage between the primary winding and the metering winding and the RS485 interface winding is larger than 2000V, the 420V voltage condition needs to be considered in the design of a power supply circuit, the voltage before 78L05 cannot exceed 36V, and in addition, the primary series thermistor of the power supply transformer ensures that the high voltage is not damaged.

The ESAM module can adopt a DIP packaging form and is suitable for being directly welded on a circuit board; if the DIP packaging form is installed in a plugging mode, the plugging needs to be ensured to be firm.

Meanwhile, because the added GPRS/4G module puts forward higher electromagnetic compatibility and anti-electromagnetic interference requirements on the performance of the electric energy meter, in order to meet the requirements, the following improvements can be made in the embodiment: because the electromagnetic compatibility and the anti-interference of the metering circuit are determined by an RN8209 chip and a layout, the whole single chip circuit and the signal transmission of the metering circuit can be isolated by adopting photoelectricity, the isolation voltage is more than 4000V, and the isolation voltage of a power transformer is more than 4000V. At the same time, the two are physically separated (set at a certain distance) on the circuit board. In addition, a voltage-sensitive resistor can be added on the fire zero line of the input voltage line, so that lightning stroke and high-frequency pulse are prevented from being transmitted into the single chip microcomputer circuit, and the work of the single chip microcomputer circuit is prevented from being interfered.

The utility model discloses a smart electric meter uses GPRS/4G module to realize stable, reliable wireless communication; the cost of manpower and equipment for traditional wired communication network wiring and network operation and maintenance is saved; the GPRS/4G communication module is designed based on the design idea of an independent peripheral device, the network operation and maintenance mechanism of the GPRS/4G communication module is completed through a microcontroller embedded in the module, and the module is connected with main hardware of the intelligent electric energy meter through a power interface and a standard serial interface; in the aspect of software control, the core single chip microcomputer of the electric energy meter can realize data receiving and transmitting control on the GPRS/4G communication module only by utilizing a plurality of groups of simple control instructions through a serial port interface; the GPRS/4G communication module is also provided with a local communication serial port, and the modification of the operating parameters of the module by the handheld device or the PC can be realized through the interface, for example: the IP and port number of a server connected with the module, and whether the module has the capability of actively uploading the data of the electric energy meter, the uploading interval time, the uploaded data items and other parameters. The parameters can be inquired and modified at the server platform end of the module with the established link through a communication instruction encrypted by a protocol; the configuration purpose of the operation parameters is to upload key data (such as voltage, current, power, current capacity stop code and the like) of one or more electric energy meters in different scenes applied by the electric energy meters; the method is matched with the application requirements of the collector service platform, for example, when the method is applied to energy consumption management, the electric parameter value and the electric quantity measuring value in a short time need to be obtained; when the charging of residential areas is applied, only the data of the whole electricity consumption of 1 to 24 times per day is needed.

In order to provide a GPRS/4G communication module particularly suitable for an intelligent electric meter and avoid the problems of more signal transmission interference, non-corresponding application scene function matching, low signal transmission safety degree and the like of a common GPRS/4G communication module in a specific scene of the intelligent electric meter, as shown in a hardware connection block diagram of the GPRS/4G module and a singlechip in fig. 2, the GPRS/4G module in the embodiment of the invention is adjusted as follows:

UTXD1 and URXD1 led out from pins of a GPRS/4G module are processed by a level matching circuit, the default level is 3.3V, the module provides 1 standard USB2.0 interface, two rates of High speed (480Mbps) and Full speed (12Mbps) are supported, suspend and resume are supported, the DEVICE can work in HOST mode and DEVICE mode, the USB interface is matched with drive, a virtual network card can be displayed on a PC, and the computer can directly access the Internet through the GPRS/4G module. Meanwhile, the GPRS/4G module provides a SIM card interface conforming to the ISO7816-3 standard and automatically identifies 3.0V and 1.8VSIM cards. In the standard mode, a clock signal of 3.25MHz is provided for the USIM card; in a low power consumption mode, a clock signal of 1.08MHz is provided for the USIM card; supporting a clock off mode; supporting a speed enhancement type USIM card by adjusting the Baud rate parameter; supporting DMA transmission/reception; supporting an automatic power saving mode in a logout mode; in RX mode, automatic parity is supported. The module uses 3.8V power supply, 16 pins are used for providing 3.8V working voltage for the module, the peripheral circuit provides sufficient power supply capacity, the fluctuation of the power supply voltage is less than 300mV, and the overcurrent capacity is 3A.

Because the maximum current of the GPRS/4G module in the work is 750mA, in order to ensure the normal power supply of the GPRS/4G module in common actions of the electric meter such as switching on and switching off, the electric energy meter of the embodiment is provided with the GPRS/4G module power supply circuit shown in figure 3, the GPRS/4G module power supply circuit adopts 12V/400mA to supply power to the single chip microcomputer circuit on a hardware circuit, then adopts a DC (direct current) voltage stabilizing module to stabilize the voltage, outputs 12V stabilized voltage, ensures that the power supply ripple is within 50mV, and then adopts the following voltage reducing circuit: the power front end adopts filter capacitor, adopt SPX29302T5 power chip, output current is 3A, guarantee heavy current output, the stability of capacitor energy storage and filtering guarantee power is also adopted to the rear end, chip output voltage can be adjusted, 4V voltage is exported after the divider resistance configuration, guarantee GPRS's normal work, chip voltage output also can be controlled, the chip has power enable foot EN to make things convenient for control voltage to export, control GPRS/4G module restarts.

The utility model discloses a GPRS/4G module is when receiving the data that come from the control unit, the interval time of adjacent 2 bytes of inspection that can be continuous. If the interval time is more than or equal to a certain 'time threshold', a frame is considered to be ended, otherwise, the data is received until the interval time is more than or equal to the packed length byte. And sending the frame data to the network end as a TCP or UDP packet. The "time threshold" is the packing interval. The settable range is 10ms to 60000ms, the GPRS/4G module leaves the factory for 50ms, and this parameter may be set according to an AT command, so that AT + UARTFT is 50.

Meanwhile, when the GPRS/4G module receives the data from the control module, the number of bytes received can be continuously checked. If the number of bytes received reaches a certain "length threshold", a frame is considered to be over. And sending the frame data to the network end as a TCP or UDP packet. The "length threshold" is the packing length. The settable range is 1-4096 bytes, and the GPRS/4G module leaves the factory default of 1000 bytes. This parameter may be set according to the AT command, let AT + UARTFL be 1000 bytes.

After the single-phase GPRS/4G remote cost control intelligent electric energy meter is incorporated into a power grid, the working process of the single-phase GPRS/4G remote cost control intelligent electric energy meter in the power grid is shown in FIG. 4. The single-phase GPRS/4G remote cost control intelligent electric energy meter sends the collected data to the collector through a GPRS/4G signal, and the collected data are transmitted to the collection system in the power grid management and power selling system in a wireless mode after being concentrated by the concentrator, so that power grid management personnel can conveniently carry out related operations such as power selling, marketing, power stop and limit management and the like.

The present invention is not limited to the above embodiments, and for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered to be within the protection scope of the present invention. Those not described in detail in this specification are within the skill of the art.

Claims (10)

1. The utility model provides a single-phase GPRS/4G remote fee control intelligent electric energy meter, includes the control unit, GPRS/4G module, electrical unit, measurement unit and the display element of integration on the PCB board, its characterized in that: the GPRS/4G module, the metering unit and the display unit are in signal connection with the control unit, and simultaneously,

The input end of the metering unit is connected with the current sampling circuit and the voltage sampling circuit, and the output end of the metering unit is in signal connection with the control unit and is used for metering electric energy of input zero line current, live line current and voltage and converting the electric energy into electric energy pulses;

The power supply unit acquires electric energy from the measuring circuit and supplies power to each module of the electric energy meter; the control unit processes the electric energy pulse acquired from the metering unit and transmits the electric energy pulse to the GPRS/4G module, and the electric energy pulse is uploaded to the master station through the GPRS/4G module.

2. the single-phase GPRS/4G remote cost-control intelligent electric energy meter of claim 1, wherein: the magnetic protection relay is characterized by further comprising a relay unit, wherein the relay unit is a magnetic protection relay, coils of the magnetic protection relay are communicated in the forward direction and disconnected in the reverse direction, and contacts are kept by permanent magnets.

3. The single-phase GPRS/4G remote cost-control intelligent electric energy meter of claim 1, wherein: the safety chip is packaged on the PCB in a dual in-line mode.

4. The single-phase GPRS/4G remote cost-control intelligent electric energy meter of claim 1, wherein: the device also comprises a data storage unit which is in signal connection with the control unit.

5. The single-phase GPRS/4G remote cost-control intelligent electric energy meter of claim 1, wherein: the power supply unit comprises three 2VA/3 windings, a first winding outputs 9V/20mA to be supplied to the metering unit, a second winding outputs 9V/50mA to be supplied to the RS485 circuit, a third winding outputs 12V/400mA to be supplied to the single chip microcomputer circuit, and rectified voltage is directly sent to the relay driving circuit.

6. The single-phase GPRS/4G remote cost-control intelligent electric energy meter of claim 1, wherein: the GPRS/4G module comprises a 4G main module, a UART/serial port level conversion circuit, a VCAP circuit, a startup and shutdown control circuit, a SIM card interface circuit and a main antenna, wherein the UART/serial port level conversion circuit, the VCAP circuit, the startup and shutdown control circuit, the SIM card interface circuit and the main antenna are connected with the 4G main module; the UART/serial port level conversion circuit is used for converting the communication level between the control unit and the 4G main module; the switch control circuit is used for receiving a switch control signal issued by the control unit and transmitting the switch control signal to the 4G main module; the VCAP circuit is used for ensuring the voltage inside the 4G main module to be stable; the SIM card interface circuit is used for reading the working information of the SIM and transmitting the working information to the 4G main module; the 4G main module uploads the acquired data of the control unit to the main station through the main antenna in a 4G communication mode, or receives the data sent by the main station and then transmits the data to the control unit.

7. the single-phase GPRS/4G remote cost-control intelligent electric energy meter of claim 6, wherein: and an ESD protection device is arranged on the SIM card interface circuit.

8. The single-phase GPRS/4G remote cost-control intelligent electric energy meter of claim 1, wherein: the GPRS/4G module is connected with a GPRS/4G module power supply circuit, and the voltage output of the GPRS/4G module power supply circuit has enabling control.

9. The single-phase GPRS/4G remote cost-control intelligent electric energy meter of claim 1, wherein: the GPRS/4G module comprises a local communication serial port, and the local communication serial port is in communication connection with handheld equipment or a computer.

10. The single-phase GPRS/4G remote cost-control intelligent electric energy meter of claim 1, wherein: and a signal transmission line between the control unit and the metering unit is provided with a photoelectric isolator, and a measuring circuit connected to the power supply unit is provided with a thermistor in series.