CN111735999A - An IoT meter based on NB-IoT communication technology - Google Patents

Abstract

A device for IoT electricity meter based on NB‑IoT communication technology. It can solve the problems of inaccurate electric energy measurement, high power consumption and limited communication in the existing electric meter. The device consists of an IoT meter and a network platform. The IoT meter includes a controller module, a power supply module, an NB‑IoT communication module, a Flash storage module, a metering module, an RTC module, a display module, a switch module, and a communication interface, and the controller module Real-time power data measurement and storage are realized by connecting the serial data port to the Flash storage module, RTC module and metering module. The IoT meter transmits data through the NB-IoT communication module, communication interface and the network platform. The network platform adopts B/ S mode is designed to access energy data through web pages and switch on and off IoT meters. The power data is remotely transmitted to the server, and then the data is processed centrally through the network platform, and abnormal data can be screened, which facilitates the collection and processing of power data.

Description

An IoT meter based on NB-IoT communication technology

technical field

The invention belongs to the technical field of electric power data collection, and mainly relates to an Internet of Things electric meter.

Background technique

The smart grid development plan formulated by the State Grid pointed out that 2016-2020 is the leading and upgrading stage of smart grid. China's technology and equipment have reached the international advanced level, and a unified "strong smart grid" will be built in an all-round way. At that time, the ability of the power grid to optimize the allocation of resources will be greatly improved, and the Internet of Things energy meter will be widely used.

The application fields of IoT meters are very wide. In addition to the large-scale procurement by State Grid Corporation, commercial real estate, municipal buildings, schools, hospitals, precision manufacturing, transportation infrastructure, data centers and other industries have a large number of applications. As the terminal equipment of the smart grid, the IoT meter can transmit data remotely with the network platform through various connection methods such as WiFi, GPRS, Ethernet, and RS485. Provide smarter and more convenient power management. In order to adapt to the smart grid, the IoT meter also integrates intelligent functions such as two-way multi-rate metering, user-end control, two-way data communication with multiple data transmission modes, and anti-theft of electricity, achieving a professional and high-performance "Internet of Things + Electricity Meter".

NB-IoT communication technology is an emerging technology in the field of wireless transmission, which supports the cellular data connection of low-power devices in the wide area network, also known as low power wide area network (LPWAN). It can provide 100,000 connections with a bandwidth of 200kHz, and has the characteristics of wide coverage, multiple connections, low speed, low cost, low power consumption, and excellent architecture, and is suitable for IoT devices that do not move frequently. Therefore, the application of NB-IoT communication technology to the IoT meter will be the development trend of the IoT meter.

SUMMARY OF THE INVENTION

In order to solve the problems of inaccurate electric energy measurement, high power consumption and limited communication in the existing electric meter, the present invention proposes a new type of Internet of Things electric meter, and its specific technical scheme is as follows:

The technical solution includes an IoT meter and a network platform. The IoT meter includes a controller module, a power supply module, an NB-IoT communication module, a Flash storage module, a metering module, an RTC module, a display module, a switch module, a communication interface, and a main processor. The module is connected to the Flash storage module, RTC module, and metering module through the serial data port to realize the measurement and storage of real-time power data. The Internet of Things meter transmits data through the NB-IoT communication module and communication interface. The platform is designed in B/S mode, which can access power data through web pages and switch on and off the IoT meter. Compared with other IoT electricity meters, this patent transmits the point electric energy data to the server remotely through the NB-IoT wireless data collection method, and then conducts centralized data processing through the network platform, and can filter abnormal data, which facilitates the collection of electric energy data. and processing.

Description of drawings

Figure 1 is a schematic diagram of the IoT meter module.

Figure 2 shows the workflow of the IoT meter and network platform.

Detailed ways

In order to clearly illustrate the technical features of this solution, the following will further illustrate this solution with reference to Figure 1 and Figure 2:

As shown in Figure 1: An IoT meter based on NB-IoT communication technology includes a controller module, a power supply module, an NB-IoT communication module, a Flash storage module, a metering module, an RTC module, a display module, a switch module and a communication module Interface composition; where:

The controller module is used to 1) integrate single-phase energy metering, RTC clock, LCD driver and enhanced 8051 core on-chip; 2) measure active power, reactive power, and RMS voltage and current, and monitor power line voltage loss and zero-crossing at the same time; 3) Low voltage reset and low voltage detection function;

Power module for supplying supply voltage and measuring voltage and low voltage protection;

NB-IoT communication module is used for deep and wide coverage data communication;

Flash memory module is used for data storage;

The metering module is used for active power and active energy, reactive power and reactive energy, voltage and current RMS and frequency calculation;

The RTC module is used to obtain the real-time clock;

The display module is used to display the electric energy information of the electric meter;

The switch module is used to realize the opening and closing operation by pulse excitation;

The communication interface is used for manual meter reading and data verification.

The main controller in the IoT meter is SH79F169B, and its main features are as follows: 1) On-chip integrated single-phase energy metering, RTC clock, LCD driver and enhanced 8051 core functions; 2) Built-in energy metering module to measure active power , reactive power, and voltage and current RMS, while monitoring the power line voltage loss, zero-crossing and other characteristics; 3) integrated 64K bytes of Flash, 3072 bytes of RAM, 3 16-bit timers, 2 12-bit PWM outputs, 2 EUART, external interrupt INT1, ADC and other resources; 4) Built-in PLL clock, watchdog timer, low voltage reset function, low voltage detection function, and SH79F169B also provides 2 kinds of low power consumption mode. It can be seen from the characteristics of SH79F169B that it has high processing frequency, powerful expansion function and low power consumption, which is very suitable for the needs of this design.

The BC95 module is selected for the NB-IoT communication module, and its main features are as follows; 1) Deep coverage: NB-IoT increases the gain by 20dB compared to LTE, and the coverage capacity is increased by 100 times; 2) Massive connections: 50-100 times more uplink capacity than 4G 3) Ultra-low power consumption: Introduced ultra-long DRX power-saving technology and PSM power-saving state mode; 4) Small size and light weight; 5) Stable communication: The success rate of data recovery with wired PLC meter reading is 60% Compared with left and right, NB-IoT can guarantee a successful data recovery rate of 99%. The BC95 module has the characteristics of wide coverage, low power consumption, stable communication, small size and light weight, and is suitable for remote data transmission.

The display module adopts CN90C4S40 LCD driver chip, which has a total output capacity of 160 points of 4COM and 40SEG. It is suitable for LCD screens with characters or graphics with low duty cycle, and is suitable for power information display of electric meters.

The switch module uses a magnetic latching relay with 16A contact switching, which can realize the opening and closing functions only by pulse excitation.

The power module provides supply voltage and measurement voltage for the IoT meter, and has a low-voltage protection function.

The RTC module is used to obtain the real-time clock. On the one hand, the real-time clock recorded by the meter can clearly record the electricity consumption in a certain period of time.

The energy metering module includes active power and active energy, reactive power and reactive energy, voltage and current RMS and frequency calculation functions, and supports flexible meter calibration schemes. The measurement signal is amplified by the analog gain amplifier and converted by the analog-to-digital converter The current and voltage values are stored in the register, and then the quantized value of the voltage and current is received by the digital signal processor, and the digital signal processing is performed to obtain the active energy, reactive energy, voltage and current RMS and other energy values.

The communication interface adopts RS-485 mode, which can perform manual meter reading and data verification.

The working principle of the IoT electric meter: real-time electric energy measurement and storage through the electric energy metering module, RTC module, and Flash storage module, real-time electric energy data is displayed through the LCD liquid crystal screen of the display module, and electric energy data is transmitted to the network platform through the NB-IoT communication module , complete the remote meter reading function. When the NB-IoT communication module receives the power-off and power-on commands sent by the network platform, the switch module drives the relay to control the gate.

The process of realizing power data management by using the Internet of Things meter and network platform is shown in Figure 2, and the process is as follows:

(1) Log in to the network platform; (2) Check the sub-module status of the IoT meter to determine whether it is abnormal; (3) If there is no abnormality in the IoT meter, check whether the current time of the IoT meter meets the reporting conditions; (4) If it meets the reporting conditions Conditions, the Internet of Things meter performs real-time energy measurement and storage through the energy metering module, RTC module, and Flash storage module; (5) Data interaction with the network platform through the NB-IoT communication module, and the Internet of Things meter receives instructions from the network platform. And deal with the instructions accordingly; (6) If there is an abnormality in the IoT meter, the abnormality will be actively reported to the network platform through the NB-IoT communication module; (7) If the reporting conditions are not met, the abnormality detection will be performed again and wait for the report to be satisfied. condition.

Claims (6)

1. An Internet of Things meter based on NB-IoT communication technology, characterized in that it is made up of an Internet of Things meter and a network platform, and the Internet of Things meter includes a controller module, a power supply module, an NB-IoT communication module, and a Flash storage module, metering module, RTC module, display module, switch module and communication interface, the controller module is connected with the Flash storage module, RTC module and metering module through the serial data port to realize the measurement and storage of real-time power data, and the IoT meter is connected through the serial data port. The NB-IoT communication module, communication interface and network platform carry out data transmission. The network platform is designed in B/S mode, which can access power data through web pages and perform switching operations on the Internet of Things meter; among which: The controller module is used to 1) integrate single-phase energy metering, RTC clock, LCD driver and enhanced 8051 core on-chip; 2) measure active power, reactive power, and RMS voltage and current, and monitor power line voltage loss and zero-crossing at the same time; 3) Low voltage reset and low voltage detection function; Power module for supplying supply voltage and measuring voltage and low voltage protection; NB-IoT communication module is used for deep and wide coverage data communication; Flash memory module is used for data storage; The metering module is used for active power and active energy, reactive power and reactive energy, voltage and current RMS and frequency calculation; The RTC module is used to obtain the real-time clock; The display module is used to display the electric energy information of the electric meter; The switch module is used to realize the opening and closing operation by pulse excitation; The communication interface is used for manual meter reading and data verification. 2 . The IoT electricity meter based on NB-IoT communication technology according to claim 1 , wherein the controller module selects SH79F169B. 3 . 3. The IoT electricity meter based on NB-IoT communication technology according to claim 1, wherein the NB-IoT communication module selects BC95. 4. The IoT electricity meter based on NB-IoT communication technology according to claim 1, wherein the display module selects CN90C4S40 liquid crystal driver chip. 5 . The IoT electricity meter based on NB-IoT communication technology according to claim 1 , wherein the communication interface is RS-485. 6 . 6. The IoT electricity meter based on NB-IoT communication technology according to claim 1, wherein the network platform comprises a data management system and a terminal control system, and the data management system manages the electric energy measured by the IoT electricity meter data; the terminal control system controls the opening and closing of the IoT meter.

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