TIDUFB8 December   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
    2. 1.2 End Equipment
    3. 1.3 Electricity Meter
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Voltage Measurement – Analog Front End
      2. 2.2.2 Current Measurement Analog Front End
      3. 2.2.3 Input Voltage
      4. 2.2.4 Clock
    3. 2.3 Highlighted Products
      1. 2.3.1 AMC130M02
      2. 2.3.2 MSPM0G1106
      3. 2.3.3 LMK6C
      4. 2.3.4 TLV76133
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Software Requirements
      1. 3.2.1 Formulas
      2. 3.2.2 Metrology Software Process
        1. 3.2.2.1 UART for PC GUI Communication
        2. 3.2.2.2 Direct Memory Access (DMA)
        3. 3.2.2.3 ADC Setup
        4. 3.2.2.4 Foreground Process
        5. 3.2.2.5 Background Process
        6. 3.2.2.6 Software Function per_sample_dsp ()
        7. 3.2.2.7 Frequency Measurement and Cycle Tracking
        8. 3.2.2.8 LED Pulse Generation
    3. 3.3 Test Setup
      1. 3.3.1 Power Supply and Jumper Settings
      2. 3.3.2 Viewing Metrology Readings and Calibration
      3. 3.3.3 Calibration
        1. 3.3.3.1 Voltage and Current Offset Calibration
        2. 3.3.3.2 Voltage and Current Gain Calibration
        3. 3.3.3.3 Active Power Gain Calibration
        4. 3.3.3.4 Offset Calibration
        5. 3.3.3.5 Phase Calibration
    4. 3.4 Test Results
      1. 3.4.1 Electricity Meter Metrology Accuracy Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 PCB Layout Recommendations
        1. 4.1.3.1 Layout Prints
      4. 4.1.4 Altium Project
      5. 4.1.5 Gerber Files
      6. 4.1.6 Assembly Drawings
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

1.3 Electricity Meter

Different end equipment has different requirements for electricity meters; for example, multiphase or single-phase, accuracy, and isolated or non-isolated. This reference design is developed for an isolated single-phase design using isolated ADC AMC130M02, and integrates power and data isolation, with the following advantages:

  • Meets the most stringent of accuracy requirements
  • Meets minimum sample rate requirements (without compromising on accuracy) that is sometimes not obtainable with application-specific products or metrology systems on a chip (SoC)
  • Enables flexibility in selecting the host MCU, based on the application requirements, such as the following:
    • Processing capability in million instructions per second (MIPS)
    • Minimum random access memory (RAM) and flash area
    • Number of communications modules:
      • Serial peripheral interface (SPI)
      • Universal asynchronous receiver - transmitter (UART)
      • Inter-integrated circuit (I2C)
      • Real-time clock (RTC)
      • Continuously transposed conductors (CRC) module

TIDA-010960 is a high-accuracy one-phase SHUNT electricity meter reference design, using two channels for standalone isolated AMC130M02 ADC and cost-effective MSPM0G1106 MCU. One channel is for SHUNT resistor current sensing and another channel is for voltage sensing.

The TIDA-010960 firmware specifically supports calculation of various metrology parameters for single-phase with Neural line energy measurement. These parameters can be viewed from the calibration GUI or through the ACT and REACT pulsed outputs, connected to a reference metrology test system.

  • Phase active (kWh), reactive (kvarh), and apparent energy (kVAh) with pulse-generation outputs
  • Phase active (kW), reactive (kvar), and apparent power (kVA)
  • Phase voltage and current root mean square (RMS)
  • Power factor
  • Line frequency