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  • One-Phase Shunt Electricity Meter Reference Design

    • TIDUF98A October   2024  – February 2025

       

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  • One-Phase Shunt Electricity Meter Reference Design
  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 End Equipment
      1. 1.1.1 Electricity Meter
    2. 1.2 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Highlighted Products
      1. 2.2.1 ADS131M03
      2. 2.2.2 MSPM0L2228
      3. 2.2.3 THVD1400
      4. 2.2.4 ISO6731
      5. 2.2.5 DRV5032
    3. 2.3 Design Considerations
      1. 2.3.1 Design Hardware Implementation
        1. 2.3.1.1 Analog Inputs
          1. 2.3.1.1.1 Voltage Measurement Analog Front End
          2. 2.3.1.1.2 Current Measurement Analog Front End
      2. 2.3.2 Energy Metrology Software
        1. 2.3.2.1 Software Architecture
        2. 2.3.2.2 Setup
          1. 2.3.2.2.1 Clocking Scheme
          2. 2.3.2.2.2 SPI
          3. 2.3.2.2.3 UART Setup for GUI Communication
          4. 2.3.2.2.4 Real-Time Clock
          5. 2.3.2.2.5 LCD Controller
          6. 2.3.2.2.6 Direct Memory Access
    4. 2.4 Hardware, Software, Testing Requirements, and Test Results
      1. 2.4.1 Required Hardware and Software
        1. 2.4.1.1 Cautions and Warnings
        2. 2.4.1.2 Hardware
          1. 2.4.1.2.1 Connections to the Test Setup
          2. 2.4.1.2.2 Power Supply Options and Jumper Settings
        3. 2.4.1.3 Calibration
      2. 2.4.2 Testing and Results
        1. 2.4.2.1 Test Setup
          1. 2.4.2.1.1 Viewing Metrology Readings and Calibration
            1. 2.4.2.1.1.1 Viewing Results From LCD
            2. 2.4.2.1.1.2 Viewing Results From PC GUI
        2. 2.4.2.2 Electricity Meter Metrology Accuracy Testing
        3. 2.4.2.3 Electricity Meter Metrology Accuracy Results
  9. 3Design Files
    1. 3.1 Schematics
    2. 3.2 Bill of Materials
    3. 3.3 PCB Layout Recommendations
      1. 3.3.1 Layout Prints
    4. 3.4 Altium Project
    5. 3.5 Gerber Files
    6. 3.6 Assembly Drawings
  10. 4Related Documentation
    1. 4.1 Trademarks
  11. 5About the Authors
  12. 6Revision History
  13. IMPORTANT NOTICE
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Design Guide

One-Phase Shunt Electricity Meter Reference Design

Description

This reference design implements a single-phase energy meter using standalone multi-channel analog-to-digital converters (ADC) to sample a shunt current sensor. The combination of the shunt sensor and a ultra low-power Hall-effect sensor (DRV5032) minimizes the effect and enables the detection of magnetic tampering attacks. The reference design achieves class 0.5S accuracy across 4000:1 input range (25mA–100A) with 8kHz sampling rate and uses a TI Arm® Cortex®-M0+ host microcontroller for calculating the metrology parameters. The necessary software functionality is implemented in MSPM0-SDK Version: 2.02.00.05 and can be compiled with TI Code Composer Studio™.

Resources

TIDA-010940 Design Folder
ADS131M03 Product Folder
MSPM0L2228 Product Folder
THVD1400, ISO6731 Product Folder
Energy Metrology Library Software
TIDA-010940 Ask our TI E2E™ support experts

Features

  • Single-phase two-wire (1P1W) class 0.5S shunt electricity meter tested across 25mA to 100A input range
  • Calculated parameters include active and reactive energy and power, RMS line current, RMS neutral current, RMS voltage, power factor, and line frequency
  • Detects potential tamper attacks with DRV5032 digital-switch Hall-effect sensor
  • RS-485 interface with 5kVRMS isolation
  • Energy metrology software with pulsed outputs to a reference test system including results displaying on a Microsoft® Windows® PC GUI.

 
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