TIDUF31B May   2023  – September 2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 MSPM0G1507
      2. 2.3.2 UCC28881
      3. 2.3.3 UCC27712
      4. 2.3.4 TLV9064
      5. 2.3.5 TPS54202
  9. 3System Design Theory
    1. 3.1  High-Voltage Buck Auxiliary Power Supply
    2. 3.2  DC Bus Voltage Sensing
    3. 3.3  Motor Drive Stage
    4. 3.4  Bypass Capacitors
    5. 3.5  Phase Current Sensing With Two or Three Shunt Resistors
    6. 3.6  Phase Current Sensing With a Single Shunt Resistor
    7. 3.7  Hall-Effect Sensor or QEI Interface for Sensored Motor Control
    8. 3.8  DAC for Software Debug
    9. 3.9  Overcurrent Protection
    10. 3.10 Overtemperature Protection
    11. 3.11 Isolated UART port
    12. 3.12 Inverter Peak Power Capability
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 Hardware Board Overview
      2. 4.1.2 Test Equipment for Board Validation
    2. 4.2 Software Requirements
      1. 4.2.1 Getting Started MSPM0 Firmware
        1. 4.2.1.1 Download and Install Software Required for Board Test
        2. 4.2.1.2 Import the Project Into CCS
        3. 4.2.1.3 Compile the Project
        4. 4.2.1.4 Download Image and Spin Motor
    3. 4.3 Test Results
      1. 4.3.1 Test Setup
      2. 4.3.2 Auxiliary Power Supply Test
      3. 4.3.3 Current Open Loop Test
      4. 4.3.4 Overcurrent Protection Test
      5. 4.3.5 Motor Start-Up Sequence
      6. 4.3.6 Load Test
    4. 4.4 Migrate Firmware to a New Hardware Board
      1. 4.4.1 Configure the PWM, CMPSS, and ADC Modules
      2. 4.4.2 Motor and Control Parameters Tuning
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Tools
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author
  13. 7Revision History

3.5 Phase Current Sensing With Two or Three Shunt Resistors

This reference design supports 1, 2, or 3 shunt resistors. Three phase currents are sensed by an external TLV9064 in this reference design; however, the MSPM0G1507 microcontroller has two built-in zero-drift, zero-crossover operational amplifiers. These op amps support up to 2 phases of current sampling, so external op amps are not necessary, thus reducing the cost for the system. Figure 3-4 shows the shunt resistor configuration.

TIDA-010250 Shunt Resistor ConfigurationFigure 3-4 Shunt Resistor Configuration