Three-phase electronic multifunctional electric energy meter

Abstract

The utility model discloses a three-phase electronic multifunctional electric energy meter. The three-phase electronic multifunctional electric energy meter comprises an AD sampling circuit, a metering unit, an expansion module and a TF card circuit, the AD sampling circuit is electrically connected with the metering unit, the metering unit is electrically connected with the expansion module, and the expansion module is electrically connected with the TF card circuit; the AD sampling circuit is used for collecting voltage and current data of each phase; the metering unit is used for metering the collected phase voltage and current data of each phase and transferring the data to the expansion module; and the TF card circuit is used for storing the voltage and current data transferred to the expansion module. According to the utility model, the technical problem of how to improve the stability and flexibility of data acquisition and storage of the electric energy meter is solved.

Description

Technical Field

[0001] This utility model relates to the field of electricity meter technology, and in particular to a three-phase electronic multi-functional electricity meter. Background Technology

[0002] With the rapid development of electricity meter data acquisition and acquisition devices, intelligent electricity monitoring technology has become a hot research direction. The realization of electricity monitoring technology relies on the acquisition of a large amount of accurate data. By installing high-precision, high-reliability sensors and instruments, real-time data collection of electricity consumption in the power system can be achieved. The collected data is transmitted to a data center for subsequent analysis and processing to address the accuracy issues of metering under different environmental conditions. Traditional electricity meters typically use wireless communication methods such as GPRS and Wi-Fi for data transmission. While this method is used for remote monitoring, wireless transmission may face problems such as data packet loss and signal instability, and requires high system bandwidth. Alternatively, it may rely on on-site waveform recorders and manual data collection, which is costly, highly susceptible to electromagnetic interference, complex to operate, and lacks flexibility in data acquisition and storage, failing to meet the high-precision requirements of complex operating conditions. Therefore, there is an urgent need to propose a three-phase electronic multi-functional electricity meter to solve the technical problems of improving the stability and flexibility of electricity meter data acquisition and storage. Utility Model Content

[0003] The main purpose of this invention is to propose a three-phase electronic multi-functional energy meter, which aims to solve the technical problem of how to improve the stability and flexibility of energy meter data acquisition and storage.

[0004] To achieve the above objectives, this utility model provides a three-phase electronic multi-function energy meter, wherein the three-phase electronic multi-function energy meter includes:

[0005] AD sampling circuit, metering unit, expansion module and TF card circuit;

[0006] The AD sampling circuit is electrically connected to the metering unit, the metering unit is electrically connected to the expansion module, and the expansion module is electrically connected to the TF card circuit.

[0007] The AD sampling circuit is used to collect voltage and current data for each phase.

[0008] The metering unit is used to measure the collected voltage and current data of each phase and transfer them to the expansion module; the TF card circuit is used to store the voltage and current data transferred to the expansion module.

[0009] In one preferred embodiment, the expansion module interacts with the metering unit and the TF card circuit via an SPI interface.

[0010] In one preferred embodiment, the AD sampling circuit uses a 24-bit AD chip of model ADS1278.

[0011] In one preferred embodiment, the AD sampling circuit supports synchronous sampling of voltage and current data from 8 channels.

[0012] In one preferred embodiment, the TF card circuit includes a TF card; pin 2 of the TF card is connected to diode V1 and resistor R1 respectively, the other end of resistor R1 is connected to resistor R10 and expansion module respectively; pin 3 of the TF card is connected to diode V2 and resistor R2 respectively, the other end of resistor R2 is connected to resistor R9 and expansion module respectively; pin 4 of the TF card is connected to diode V3, capacitor C1, capacitor C2 and the drain of MOSFET Q1 respectively; pin 5 of the TF card is connected to diode V4 and resistor R3 respectively, the other end of resistor R3 is connected to resistor R8 and expansion module respectively; pin 7 of the TF card is connected to diode V5 and resistor R4 respectively, the resistor... The other end of R4 is connected to resistor R7 and the expansion module. Pin 9 of the TF card is connected to resistor R5. The other end of resistor R5 is connected to resistor R6 and the expansion module. The source of MOSFET Q1 is connected to resistors R6, R7, R8, R9, and R10, as well as the power supply terminal. The gate of MOSFET Q1 is connected to resistors R11 and R12, as well as capacitor C3. The other end of resistor R11 is connected to the power supply terminal. The other end of resistor R12 is connected to the expansion module. Pin 6 of the TF card, capacitors C3, C1, and C2, diodes V1, V2, V3, V4, and V5 are grounded.

[0013] In one preferred embodiment, the TF card is connected to the expansion module via hot-swapping.

[0014] In the above technical solution of this utility model, the three-phase electronic multi-functional energy meter includes: an AD sampling circuit, a metering unit, an expansion module, and a TF card circuit; the AD sampling circuit is electrically connected to the metering unit, the metering unit is electrically connected to the expansion module, and the expansion module is electrically connected to the TF card circuit; the AD sampling circuit is used to collect voltage and current data for each phase; the metering unit is used to measure the collected voltage and current data for each phase and transfer it to the expansion module; the TF card circuit is used to store the voltage and current data transferred to the expansion module. This utility model has a simple structure, is easy to use, and solves the technical problem of how to improve the stability and flexibility of energy meter data acquisition and storage.

[0015] In this invention, the TF card circuit supports two selectable communication protocols: SD and SPI bus modes. The SPI mode realizes data transmission through a serial interface, which has simpler hardware requirements and flexible communication methods. It is suitable for low-speed data transmission and low-power applications, reducing system complexity and meeting the storage requirements of the design. It ensures system stability and data transmission reliability. The addition of a series resistor to the communication line effectively reduces signal reflection and electromagnetic interference during high-speed transmission.

[0016] In this invention, the TF card circuit protects the circuit and data security, suppresses overvoltage caused by electrostatic discharge or power supply voltage fluctuations, and prevents damage to the medium caused by static electricity generated during the insertion and removal of the TF card.

[0017] In this invention, the AD sampling circuit uses 24-bit high-precision sampling to ensure the accuracy and stability of the data.

[0018] In this invention, the TF card serves as a storage medium, featuring plug-and-play and hot-swappable functionality, and supports SPI bus mode, thus reducing system complexity. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a first schematic diagram of a three-phase electronic multi-functional energy meter according to an embodiment of the present invention;

[0021] Figure 2 This is a second schematic diagram of a three-phase electronic multi-functional energy meter according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the AD sampling circuit according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the TF card circuit according to an embodiment of the present invention.

[0024] Explanation of icon numbers:

[0025] 1. Expansion module; 2. Meter body; 3. TF card circuit; 4. AD sampling circuit; 5. Metering unit.

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] See Figures 1-4 According to one aspect of this utility model, this utility model provides a three-phase electronic multi-function energy meter, wherein the three-phase electronic multi-function energy meter includes:

[0030] AD sampling circuit 4, metering unit 5, expansion module 1 and TF card circuit 3;

[0031] The AD sampling circuit 4 is electrically connected to the metering unit 5, the metering unit 5 is electrically connected to the expansion module 1, and the expansion module 1 is electrically connected to the TF card circuit 3.

[0032] The AD sampling circuit 4 is used to collect voltage and current data for each phase.

[0033] The metering unit 5 is used to measure the collected voltage and current data of each phase and transfer them to the expansion module 1; the TF card circuit 3 is used to store the voltage and current data transferred to the expansion module 1.

[0034] Specifically, in this embodiment, see Figure 2 The three-phase electronic multi-function energy meter includes a meter body 2. The expansion module 1 adopts a modular design and can be detachably placed inside the meter body 2. The TF card in the TF card circuit 3 is hot-swappable connected to the expansion module 1.

[0035] Specifically, in this embodiment, the three-phase electronic multi-function energy meter samples the voltage and current data of each phase through a 24-bit AD sampling circuit 4 to achieve raw energy data acquisition. The metering unit 5 measures the obtained voltage and current data in real time and transfers the measured voltage and current data to the expansion module 1 through the SPI interface. The expansion module 1 further packages the data and stores it in the TF circuit.

[0036] Specifically, in this embodiment, the expansion module 1 uses a microcontroller of model SCM402FB. This utility model does not impose specific limitations, and the specific settings can be made according to needs. The maximum operating frequency of the expansion module 1 is 180MHz. It integrates a single-cycle DSP instruction and a single-precision floating-point arithmetic unit, and has 5120KB of built-in flash memory and 1024KB of SRAM. It has rich on-chip peripherals, including SPI interface, I2C interface, UART interface and internal clock, etc.

[0037] Specifically, in this embodiment, the expansion module 1 interacts with the metering unit 5 and the TF card circuit 3 via the SPI interface.

[0038] Specifically, in this embodiment, the AD sampling circuit 4 uses a 24-bit AD chip of model ADS1278; the reference voltage of the AD sampling circuit 4 is 2.5V; the AD sampling circuit 4 supports synchronous sampling of voltage and current data from 8 channels, and the conversion rate meets the requirements of the energy meter for fast sampling and conversion; the AD sampling circuit 4 avoids phase errors that may be caused by asynchronous sampling by synchronously sampling the input voltage and current data, sampling 128 points per cycle at a sampling frequency of 6.4KHz. After processing by the expansion module 1, the raw data of a single cycle... The data volume can reach 9Kbytes. If continuous sampling is performed around the clock, the daily data volume will reach 37GB. In order to monitor and record power for a long time and at the same time reduce the data storage burden, this utility model collects continuous data for 3 seconds every hour of frequency power data. The data volume every 20ms is 9kByte, and the daily data storage volume is 32.4MByte. By continuously collecting voltage and current data, the data volume every 20ms is 30Byte, and the daily data storage volume is 129.6MByte. In order to ensure long-term monitoring and recording, the data storage capacity needs to be effectively controlled.

[0039] Specifically, in this embodiment, the TF card circuit 3 includes a TF card; pin 2 of the TF card is connected to diode V1 and resistor R1 respectively, the other end of resistor R1 is connected to resistor R10 and expansion module 1 respectively; pin 3 of the TF card is connected to diode V2 and resistor R2 respectively, the other end of resistor R2 is connected to resistor R9 and expansion module 1 respectively; pin 4 of the TF card is connected to diode V3, capacitor C1, capacitor C2 and the drain of MOSFET Q1 respectively; pin 5 of the TF card is connected to diode V4 and resistor R3 respectively, the other end of resistor R3 is connected to resistor R8 and expansion module 1 respectively; pin 7 of the TF card is connected to diode V5 and resistor R4 respectively. The other end of resistor R4 is connected to resistor R7 and expansion module 1 respectively. Pin 9 of the TF card is connected to resistor R5. The other end of resistor R5 is connected to resistor R6 and expansion module 1 respectively. The source of MOSFET Q1 is connected to resistors R6, R7, R8, R9, R10 and the power supply terminal respectively. The gate of MOSFET Q1 is connected to resistors R11, R12 and capacitor C3 respectively. The other end of resistor R11 is connected to the power supply terminal. The other end of resistor R12 is connected to expansion module 1. Pin 6 of the TF card, capacitors C3, C1, C2, diodes V1, V2, V3, V4 and V5 are grounded.

[0040] Specifically, in this embodiment, the present invention uses a TF card as a storage medium to store the original power data, enabling the energy meter to have high storage density, low power consumption, fast read and write speed and long storage life, making it suitable for long-term data storage applications. The TF card is connected to the expansion module 1 in a hot-swappable manner, supporting plug-and-play operation, which provides convenience for the maintenance and operation of the energy meter.

[0041] Specifically, in this embodiment, the TF card circuit 3 supports SD and SPI bus modes. In both modes, data can be read and written through the SD card interface. SD mode provides 4-bit parallel data transmission, suitable for large-scale, high-speed data transmission applications. SPI mode, on the other hand, uses a serial interface for data transmission, offering simpler hardware requirements and more flexible communication, making it suitable for low-speed data transmission and low-power applications. This invention uses SPI mode for data transmission to reduce system complexity and meet the design's storage requirements. In SPI mode, the data transmission rate is typically limited by the communication frequency and hardware configuration. In this invention, the SPI bus is used for data transmission. The communication rate can be adjusted according to the support capabilities of the TF card and expansion module 1 to ensure system stability and data transmission reliability. The interface design of the SPI mode needs to consider the integrity of the signal line and the anti-interference capability. Therefore, when the SPI signal line is connected to the TF card, a 22Ω resistor is connected in series to effectively reduce signal reflection and electromagnetic interference during high-speed transmission. In addition, in order to protect the circuit and data security, TVS diodes, namely diodes V1, V2, V3, V4 and V5, are added at the TF card interface in the TF card circuit 3 to suppress overvoltage phenomena caused by electrostatic discharge or power supply voltage fluctuations and prevent electrostatic discharge generated during TF card insertion and removal from damaging the storage medium.

[0042] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A three-phase electronic multifunctional electric energy meter, characterized in that, The utility model relates to a kind of AD sampling circuit, metering unit, extension module and TF card circuit including: The AD sampling circuit is electrically connected with metering unit, the metering unit is electrically connected with extension module, and the extension module is electrically connected with TF card circuit; The AD sampling circuit is used to collect each phase voltage, current data; The metering unit is used to measure each phase voltage, current data collected, and store to extension module;The TF card circuit is used to store voltage, current data stored to extension module. The extension module carries out data interaction with metering unit and TF card circuit by SPI interface.

2. The three-phase electronic multifunctional electric energy meter according to claim 1, characterized in that, The AD sampling circuit uses 24-bit type ADS1278 AD chip.

3. The three-phase electronic multifunctional electric energy meter according to any one of claims 1-2, characterized in that, The AD sampling circuit supports 8 channels of voltage, current data synchronous sampling.

4. The three-phase electronic multifunctional electric energy meter according to any one of claims 1-2, characterized in that, The TF card circuit includes TF card;2 pins of the TF card are connected with diode V1 and resistance R1 respectively, another end of the resistance R1 is connected with resistance R10 and extension module respectively, 3 pins of the TF card are connected with diode V2 and resistance R2 respectively, another end of the resistance R2 is connected with resistance R9 and extension module respectively, 4 pins of the TF card are connected with diode V3, capacitor C1, capacitor C2 and drain of MOS tube Q1 respectively, 5 pins of the TF card are connected with diode V4 and resistance R3 respectively, another end of the resistance R3 is connected with resistance R8 and extension module respectively, 7 pins of the TF card are connected with diode V5 and resistance R4 respectively, another end of the resistance R4 is connected with resistance R7 and extension module respectively, 9 pins of the TF card are connected with resistance R5, another end of the resistance R5 is connected with resistance R6 and extension module respectively, source of the MOS tube Q1 is connected with resistance R6, resistance R7, resistance R8, resistance R9, resistance R10 and power supply terminal respectively, gate of the MOS tube Q1 is connected with resistance R11, resistance R12 and capacitor C3 respectively, another end of the resistance R11 is connected with power supply terminal, another end of the resistance R12 is connected with extension module, another end of 6 pins of the TF card, capacitor C3, capacitor C1, capacitor C2, diode V1, diode V2, diode V3, diode V4 and diode V5 is grounded.

5. The three-phase electronic multifunctional electric energy meter according to any one of claims 1-2, characterized in that, The TF card is connected with extension module in the way of hot plug.

6. The three-phase electronic multifunctional watt-hour meter according to claim 5, characterized in that, ​

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