A miniaturized electric energy metering device based on HPLC communication technology

Abstract

The present invention discloses a miniaturized electric energy metering device based on HPLC communication technology, which belongs to the field of electric energy metering, and includes an electric energy acquisition terminal, which includes a microcontroller unit, a three-phase electric energy parameter measurement circuit, an output device, and a STA Internet of Things communication module; the three-phase electric energy parameter measurement circuit is used to receive a signal from a three-phase current transformer / single-phase current transformer, measure voltage information, and send the voltage information to the microcontroller unit; the microcontroller unit obtains an output signal and topological network identification information according to the received voltage information; the output device is used to send an output signal and topological network identification information; the microcontroller unit is connected to an external gateway / repeater through the STA Internet of Things communication module; the STA Internet of Things communication module includes a CT241H carrier chip, an active front end, and a Hash data storage device. The present invention can be compatible with multiple communication modes, and at the same time, realize miniaturization and convenient installation.

Description

Technical Field

[0001] The invention belongs to the field of electric energy metering, and in particular relates to a miniaturized electric energy metering device based on HPLC communication technology. Background Art

[0002] HPLC is a high-speed power line carrier, also known as broadband power line carrier, which is a broadband power line carrier technology for data transmission on low-voltage power lines. The broadband power line carrier communication network uses power lines as a communication medium to achieve the aggregation, transmission, and interaction of electricity consumption information of low-voltage power users. Broadband power line carrier mainly uses orthogonal frequency division multiplexing (OFDM) technology, and the frequency band uses 2MHz-12MHz. Compared with traditional low-speed narrowband power line carrier technology, HPLC technology has large bandwidth and high transmission rate, which can meet the higher requirements of low-voltage power line carrier communication.

[0003] The power line broadband carrier communication module (HPLC module for short) is used in concentrators, collectors, electric energy meters and other products. It realizes data transmission, data reading, channel management, power outage event reporting, network topology identification and other functions through carrier communication on the medium of power lines.

[0004] At present, the three-phase electric energy metering devices on the market can be roughly divided into two categories:

[0005] 1. Three-phase metering meter with HPLC communication function. This type of metering device is large in size, high in cost, and difficult to install. It is not suitable for use at load points with narrow space on the production line or for point-to-point refined management of electrical equipment.

[0006] 2. Three-phase rail-type metering meter without HPLC module. This type of metering device is small in size and low in cost, but generally only supports RS485 communication, and has the defects of short communication distance and time-consuming and labor-intensive on-site construction wiring.

[0007] Therefore, there is currently no product on the market that is compatible with multiple communication methods, has complete functions, is compact in size, and is easy to install.

[0008] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0009] The object of the present invention is to provide a miniaturized electric energy metering device based on HPLC communication technology, which is compatible with multiple communication modes and can achieve miniaturization and convenient installation.

[0010] To achieve the above-mentioned purpose, the present invention provides a miniaturized electric energy metering device based on HPLC communication technology, which is applied to a metering electric meter, and includes an electric energy acquisition terminal, which is respectively connected to a three-phase current transformer / single-phase current transformer and an external gateway / repeater; the electric energy acquisition terminal includes a microcontroller unit, a three-phase electric energy parameter measurement circuit, an output device and an STA Internet of Things communication module; the three-phase electric energy parameter measurement circuit is used to receive the signal of the three-phase current transformer / single-phase current transformer, measure voltage information and send the voltage information to the microcontroller unit; the microcontroller unit obtains an output signal and a topological network identification information according to the received voltage information; the output device is used to send an output signal and a topological network identification information; the microcontroller unit is connected to the external gateway / repeater through the STA Internet of Things communication module; the STA Internet of Things communication module includes a CT241H carrier chip, an active front end and a Hash data storage device.

[0011] In one embodiment of the present invention, the output device can be connected to a handheld operation and maintenance terminal to send an output signal of the microcontroller unit to the handheld operation and maintenance terminal and receive a control instruction sent by the handheld operation and maintenance terminal.

[0012] In one embodiment of the present invention, the output signal of the micro control unit includes the processing result of the micro control unit and topology network identification information.

[0013] In one embodiment of the present invention, the micro control unit can also be connected to the external gateway / repeater via an RS485 serial port.

[0014] In one embodiment of the present invention, the SCT241H carrier chip uses power lines to transmit analog or digital signals at high speed through HPLC communication; the active front end is connected to the power line and outputs a DC voltage; the Hash data storage device is used to store data of the STA IoT communication module.

[0015] In one embodiment of the present invention, the STA IoT communication module also includes a TTL serial port and an LED light.

[0016] In one embodiment of the present invention, the electric energy collection terminal further includes a memory, a real-time clock, an alarm and an LED indicator light.

[0017] In one embodiment of the present invention, the output device further includes a micro-power wireless communication module for connecting to the handheld operation and maintenance terminal via micro-power wireless communication.

[0018] In one embodiment of the present invention, the output device further includes a Bluetooth communication module for connecting to the handheld operation and maintenance terminal via Bluetooth.

[0019] Compared with the prior art, the miniaturized electric energy metering device based on HPLC communication technology according to the present invention has the following advantages:

[0020] 1. This product is small in size, with a length × width × height of 160mm × 65mm × 70mm. Its volume is about one-third of that of ordinary three-phase meters on the market, and is comparable to that of rail-type three-phase meters.

[0021] 2. Support HPLC, RS485, infrared, Bluetooth, micro-power and other communication methods, and support construction and installation in various application scenarios.

[0022] 3. Through the application of topology identification function, each node in the network can be monitored. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of a miniaturized electric energy metering device based on HPLC communication technology according to an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of a STA IoT communication module of a miniaturized electric energy metering device based on HPLC communication technology according to an embodiment of the present invention;

[0025] Description of main reference numerals:

[0026] 1-Electric energy collection terminal, 101-Micro control unit, 102-Three-phase electric energy parameter measurement circuit, 103-Output device, 104-STA Internet of Things communication module, 105-Memory, 106-Real-time clock, 107-Alarm, 108-LED indicator, 1041-SCT241H carrier chip, 1042-Active front end, 1043-Hash data storage, 1044-TTL serial port, 1045-LED light, 2-Three-phase current transformer / single-phase current transformer, 3-Gateway / Repeater, 4-Handheld operation and maintenance terminal. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0028] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0029] like Figure 1As shown, according to a preferred embodiment of the present invention, a miniaturized electric energy metering device based on HPLC communication technology includes an electric energy collection terminal 1, which can be connected to a three-phase current transformer / single-phase current transformer 2 and can receive a three-phase / single-phase current signal, and can also be connected to an external gateway / repeater 3 to send the processed signal to the gateway / repeater 3.

[0030] Specifically, the power collection terminal 1 includes a micro control unit (MCU) 101 , a three-phase power parameter measurement circuit 102 , an output device 103 and a STA Internet of Things communication module 104 .

[0031] The three-phase electric energy parameter measurement circuit 102 is used to receive the signal of the three-phase current transformer / single-phase current transformer 2 , measure the voltage information, and then send the voltage information to the micro control unit (MCU) 101 .

[0032] The microcontroller unit (MCU) 101 can perform calculations based on the received voltage information to obtain an output signal to complete topology identification. Topology identification can obtain topology network identification information, and based on the newly added topology change information and the discovery list, combined with the standard protocol function network topology information and multi-network information, a complete topology network change is formed to track the information and changes of each node in the network. The processing result of the microcontroller unit 101 includes electric energy metering information. The three-phase current transformer / single-phase current transformer 2 can obtain current information, and the electric energy metering information can be obtained based on the measured voltage information.

[0033] The output device 103 can be connected to the handheld operation and maintenance terminal 4, and is used to send the output signal of the micro control unit 101 to the handheld operation and maintenance terminal 4, and receive the control command sent by the handheld operation and maintenance terminal 4. The output signal of the micro control unit 101 includes power metering information and topology network identification information. The control command of the handheld operation and maintenance terminal 4 is the control command sent by the operator to the entire power collection terminal 1.

[0034] The handheld operation and maintenance terminal 4 may be a dedicated handheld mobile device or an APP application on a mobile phone.

[0035] In addition, the output device 103 may also include a micro-power wireless communication module, which is used to connect to the handheld operation and maintenance terminal 4 by means of micro-power wireless communication, and has the characteristics of long distance, low power consumption, multiple nodes, and low cost. The output device 103 may also include a Bluetooth communication module, which is used to connect to the handheld operation and maintenance terminal 4 by means of Bluetooth, and has the characteristics of low power, low price, and low latency.

[0036] The microcontroller unit (MCU) 101 can be connected to the external gateway / repeater 3 through the STA IoT communication module 104, and is used to send the output signal of the microcontroller unit 101 and receive all external request operations. The STA IoT communication module 104 supports baud rate adaptation, and minimizes the size of the product while retaining the HPLC carrier communication function. The external gateway / repeater 3 can receive the output signal and receive the working status of the metering meter sent by the external central controller.

[0037] In addition, the micro control unit (MCU) 101 can also be connected to the external gateway / repeater 3 via the RS485 serial port.

[0038] The specifications of the STA IoT communication module 104 are as follows:

[0039] Working frequency band: 0.7~12MHz (support frequency band division);

[0040] Modulation: OFDM;

[0041] Working voltage: DC 12V±1V DC 5V±1V;

[0042] Power consumption: static power ≤ 0.6W dynamic power ≤ 1.5W;

[0043] Working temperature: -40~70℃(C3 level);

[0044] Storage and working humidity: ≤95% (no condensation)

[0045] In the present invention, the structure diagram of the STA IoT communication module 104 is as follows: Figure 2 As shown, it includes an SCT241H carrier chip 1041, an active front end 1042 and a Hash data storage 1043. The SCT241H carrier chip 1041 uses power lines to transmit analog or digital signals at high speed through HPLC communication. The active front end 1042 is connected to the power line, draws sinusoidal AC power from the power grid, outputs DC voltage after rectification, and supplies power to the STA IoT communication module 104. The Hash data storage 1043 is used to store data of the STA IoT communication module 104.

[0046] The STA IoT communication module 104 further includes a TTL serial port 1044 and an LED light 1045 . The TTL serial port 1044 is used to connect to an external device, and the LED light 1045 is used to display the working status of the STA IoT communication module 104 .

[0047] The power collection terminal 1 also includes a memory 105, a real-time clock 106, an alarm 107 and an LED indicator 108. The memory 105 is used to store information processed and received by the power collection terminal 1, which is convenient for subsequent operators to find. The real-time clock 106 can provide time synchronization. The alarm 107 includes an audio-visual module, which can provide sound and light alarms when an abnormal situation occurs in the power collection terminal 1. The LED indicator 108 can display the working status of the power collection terminal 1, which is convenient for operators to observe and operate.

[0048] When the present invention is in operation, the three-phase electric energy parameter measurement circuit 102 measures the voltage information according to the signal of the three-phase current transformer / single-phase current transformer 2, and sends the voltage information to the micro control unit (MCU) 101; the micro control unit (MCU) 101 obtains the electric energy metering information and the topological network identification information according to the received voltage information; then, it is sent to the handheld operation and maintenance terminal 4 for the operator to view through the output device 103, and is sent to the external gateway / repeater 3 through the STA IoT communication module 104

[0049] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A miniaturized electric energy metering device based on HPLC communication technology, characterized in that: It includes an electric energy collection terminal, which is respectively connected to a three-phase current transformer / single-phase current transformer and an external gateway / repeater; the electric energy collection terminal includes a micro control unit, a three-phase electric energy parameter measurement circuit, an output device and a STA Internet of Things communication module; The three-phase electric energy parameter measurement circuit is used to receive the signal of the three-phase current transformer / single-phase current transformer, measure the voltage information and send the voltage information to the micro control unit; the micro control unit obtains the output signal and the topology network identification information according to the received voltage information; the output device is used to send the output signal and the topology network identification information; the micro control unit is connected to the external gateway / repeater through the STA IoT communication module; the STA IoT communication module includes an SCT241H carrier chip, an active front end and a Hash data storage device; The SCT241H carrier chip uses the power line to transmit analog or digital signals at high speed through HPLC communication mode; the active front end is connected to the power line and outputs a DC voltage; the Hash data storage is used to store the data of the STA IoT communication module; The micro control unit can perform calculations based on the received voltage information to obtain an output signal and complete topology identification; the output signal of the micro control unit includes the processing result of the micro control unit and the topology network identification information.

2. The miniaturized electric energy metering device based on HPLC communication technology as claimed in claim 1, characterized in that: The output device can be connected to the handheld operation and maintenance terminal to send the output signal of the micro control unit to the handheld operation and maintenance terminal, and receive the control instructions sent by the handheld operation and maintenance terminal.

3. The miniaturized electric energy metering device based on HPLC communication technology as claimed in claim 1, characterized in that: The micro control unit can also be connected to the external gateway / repeater via an RS485 serial port.

4. The miniaturized electric energy metering device based on HPLC communication technology as claimed in claim 1, characterized in that: The STA IoT communication module also includes a TTL serial port and an LED light.

5. The miniaturized electric energy metering device based on HPLC communication technology as claimed in claim 1, characterized in that: The electric energy collection terminal also includes a memory, a real-time clock, an alarm and an LED indicator light.

6. The miniaturized electric energy metering device based on HPLC communication technology as claimed in claim 2, characterized in that: The output device also includes a micro-power wireless communication module, which is used to connect to the handheld operation and maintenance terminal via micro-power wireless communication.

7. The miniaturized electric energy metering device based on HPLC communication technology as claimed in claim 2, characterized in that: The output device also includes a Bluetooth communication module, which is used to connect to the handheld operation and maintenance terminal via Bluetooth.

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