TIDUFB1 December   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Terminology
    2. 1.2 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Control System Design Theory
        1. 2.2.1.1 PWM Modulation
        2. 2.2.1.2 Current Loop Model
        3. 2.2.1.3 DC Bus Regulation Loop
        4. 2.2.1.4 DC Voltage Balance Controller
    3. 2.3 Highlighted Products
      1. 2.3.1 TMS320F280013x
      2. 2.3.2 UCC5350
      3. 2.3.3 AMC1350
      4. 2.3.4 TMCS1123
      5. 2.3.5 UCC28750
      6. 2.3.6 LM25180
      7. 2.3.7 ISOTMP35
      8. 2.3.8 TLV76133
      9. 2.3.9 TLV9062
    4. 2.4 Hardware Design
      1. 2.4.1  Inductor Design
      2. 2.4.2  Bus Capacitor Selection
      3. 2.4.3  Input AC Voltage Sensing
      4. 2.4.4  Output DCBUS Voltage Sensing
      5. 2.4.5  Auxiliary Power Supply
      6. 2.4.6  Isolated Power Supply
      7. 2.4.7  Inductor Current Sensing
      8. 2.4.8  Gate Driver
      9. 2.4.9  Isolated Temperature Sensing
      10. 2.4.10 Overcurrent, Overvoltage Protection (CMPSS)
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 Getting Started Hardware
        1. 3.1.1.1 Board Overview
        2. 3.1.1.2 Test Equipment
    2. 3.2 Software Requirements
      1. 3.2.1 Getting Started GUI
        1. 3.2.1.1 Test Setup
        2. 3.2.1.2 Overview of a GUI Software
        3. 3.2.1.3 Procedures of Test With GUI
      2. 3.2.2 Getting Started Firmware
        1. 3.2.2.1 Opening the Project Inside Code Composer Studio™
        2. 3.2.2.2 Project Structure
        3. 3.2.2.3 Test Setup
        4. 3.2.2.4 Running Project
          1. 3.2.2.4.1 INCR_BUILD 1: Open Loop
            1. 3.2.2.4.1.1 Setting, Building, and Loading the Project
            2. 3.2.2.4.1.2 Setup Debug Environment Windows
            3. 3.2.2.4.1.3 Using Real-Time Emulation
            4. 3.2.2.4.1.4 Running Code (Build 1)
          2. 3.2.2.4.2 INCR_BUILD 2: Closed Current Loop
            1. 3.2.2.4.2.1 Running Code (Build 2)
            2. 3.2.2.4.2.2 Building and Loading the Project and Setting Up Debug
          3. 3.2.2.4.3 INCR_BUILD 3: Closed Voltage and Current Loop
            1. 3.2.2.4.3.1 Building and Loading the Project and Setting Up Debug
            2. 3.2.2.4.3.2 Running Code (Build 3)
          4. 3.2.2.4.4 INCR_BUILD 4: Closed Balance, Voltage, and Current Loop
            1. 3.2.2.4.4.1 Building and Loading the Project and Setting Up Debug
            2. 3.2.2.4.4.2 Running Code (Build 4)
    3. 3.3 Test Results
      1. 3.3.1  IGBT Gate Rising and Falling Time
      2. 3.3.2  Power On Sequence
      3. 3.3.3  PFC Started by GUI
      4. 3.3.4  Zero Crossing Under 380VAC, 9kW
      5. 3.3.5  Current Ripple Under 380VAC,10kW
      6. 3.3.6  10kW Load Test With Grid Power
      7. 3.3.7  9kW Load Test With AC Power Source
      8. 3.3.8  Power Analyzer Results
      9. 3.3.9  Thermal Performance
      10. 3.3.10 Voltage Short Interrupt Test
      11. 3.3.11 Efficiency, iTHD, and Power Factor Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 Bill of Material (BOM)
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author
3.2.2.4.2.1 Running Code (Build 2)
  1. Run the project by clicking the TIDA-010257 button.
  2. Test first at a low voltage. Therefore, the input AC voltage is raised to only 40VRMS, 50Hz.
  3. Figure 3-17 illustrates the input current and voltage waveform.
    TIDA-010257 Build Level 2: Scope Capture Ia and Va (40VRMS L-N) With PWM Tripped
    • CH1 (Blue): DCBUS output voltage
    • CH2 (Light blue): AC input phase A voltage
    • CH3 (Pink): IGBT gate voltage
    • CH4 (Green): AC Input phase A current
    Figure 3-17 Build Level 2: Scope Capture Ia and Va (40VRMS L-N) With PWM Tripped
  4. A current reference is set by changing the iLRef variable in the Expressions view. This variable is set to 0.02.
  5. Clear the trip by setting the clearTrip variable to 1.
  6. As soon as the trip is cleared, a sinusoidal current drawn from the input, which verifies correct operation of the current loop. Figure 3-18 shows the waveform.
    TIDA-010257 Build Level 2: Scope Capture Ia and Va (40VRMS L-N) With iLRef = 0.02
    • CH1 (Blue): DCBUS output voltage
    • CH2 (Light blue): AC input phase A voltage
    • CH3 (Pink): IGBT gate voltage
    • CH4 (Green): AC Input phase A current
    Figure 3-18 Build Level 2: Scope Capture Ia and Va (40VRMS L-N) With iLRef = 0.02
  7. The guiVbus variable is close to 230V, and the input AC current per phase is close to 1.07A.
  8. Raise the input AC voltage slowly to 120VRMS. The board maintains the input current to be constant as the input voltage rises. The output voltage is raised to 460V. Figure 3-19 shows what the waveforms look like.
    TIDA-010257 Build Level 2: Scope Capture Ia and Va (120VRMS L-N) With iLRef = 0.02
    • CH1 (Blue): DCBUS output voltage
    • CH2 (Light blue): AC input phase A voltage
    • CH3 (Pink): IGBT gate voltage
    • CH4 (Green): AC Input phase A current
    Figure 3-19 Build Level 2: Scope Capture Ia and Va (120VRMS L-N) With iLRef = 0.02
  9. Now raise the current reference iLRef to 0.05. Observe the bus voltage go to 610V and the input current to around 2.5A. Figure 3-20 shows the waveforms.
    TIDA-010257 Build Level 2: Scope Capture Ia and Va (120VRMS L-N) With iLRef = 0.05
    • CH1 (Blue): DCBUS output voltage
    • CH2 (Light blue): AC input phase A voltage
    • CH3 (Pink): IGBT gate voltage
    • CH4 (Green): AC Input phase A current
    Figure 3-20 Build Level 2: Scope Capture Ia and Va (120VRMS L-N) With iLRef = 0.05
  10. As only a proportional gain is used in the compensator, the current reference minus the feedback error is never zero. Notice the current drawn deviates slightly from the reference.
  11. To bring the system to a safe stop, bring the input AC voltage down to zero, and observe that guiVBus comes down to zero as well.
  12. Fully halting the MCU when in real-time mode is a two-step process. First halt the processor by using the Halt button on the toolbar (TIDA-010257 ) or by using Target > Halt. Next take the MCU out of real-time mode by clicking on the TIDA-010257 button. Finally, reset the MCU (TIDA-010257 ) .
  13. Close the CCS debug session by clicking on Terminate Debug Session (Target > Terminate all).
    TIDA-010257