TIDUF87 November   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
      1. 2.2.1 Current and Voltage Controller
      2. 2.2.2 DC/DC Start-Up
      3. 2.2.3 High-Resolution PWM Generation
    3. 2.3 Highlighted Products
      1. 2.3.1 TMS320F28P650DK
      2. 2.3.2 ADS8588S
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Software Requirements
      1. 3.2.1 Opening the Project Inside Code Composer Studio
      2. 3.2.2 Project Structure
      3. 3.2.3 Software Flow Diagram
    3. 3.3 Test Setup
      1. 3.3.1 Hardware Setup to Tune the Current and Voltage Loop
      2. 3.3.2 Hardware Setup to Test Bidirectional Power Flow
      3. 3.3.3 Hardware Setup for Current and Voltage Calibration
    4. 3.4 Test Procedure
      1. 3.4.1 Lab Variables Definitions
      2. 3.4.2 Lab 1. Open-Loop Current Control Single Phase
        1. 3.4.2.1 Setting Software Options for Lab 1
        2. 3.4.2.2 Building and Loading the Project and Setting up Debug Environment
        3. 3.4.2.3 Running the Code
      3. 3.4.3 Lab 2. Closed Loop Current Control Single Phase
        1. 3.4.3.1 Setting Software Options for Lab 2
        2. 3.4.3.2 Building and Loading the Project and Setting up Debug Environment
        3. 3.4.3.3 Running the Code
      4. 3.4.4 Lab 3. Open Loop Voltage Control Single Channel
        1. 3.4.4.1 Setting Software Options for Lab 3
        2. 3.4.4.2 Building and Loading the Project and Setting up Debug Environment
        3. 3.4.4.3 Running the Code
      5. 3.4.5 Lab 4. Closed Loop Current and Voltage Control Single Channel
        1. 3.4.5.1 Setting Software Options for Lab 4
        2. 3.4.5.2 Building and Loading the Project and Setting up Debug Environment
        3. 3.4.5.3 Running the Code
      6. 3.4.6 Lab 5. Closed Loop Current and Voltage Control Four Channels
        1. 3.4.6.1 Setting Software Options for Lab 5
        2. 3.4.6.2 Building and Loading the Project and Setting up Debug Environment
        3. 3.4.6.3 Running the Code
      7. 3.4.7 Calibration
    5. 3.5 Test Results
      1. 3.5.1 Current Loop Load Regulation
      2. 3.5.2 Current Loop Linearity Test
      3. 3.5.3 Voltage Loop Linearity Test
      4. 3.5.4 DCM Start-Up
      5. 3.5.5 Bidirectional Current Switching Time
      6. 3.5.6 Thermal Performance
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 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

3.4.3.3 Running the Code

Use the following steps to run the code for Lab 2:

  1. To run this lab, make sure the hardware is set up as outlined in Section 3.3.2.
  2. Run the project by clicking TIDA-010090 from the menu bar.
  3. In the watch view, check if the BT4CH_InputVoltageSense_V is from 12V to 15V in the Expression Window.
  4. Set the following parameters from the Expression Window:
    • Set the BT4CH_userParam_chX->Relay_ON to 1 to enable the output relay.
    • BT4CH_userParam_chX->iref_A = 15.0.
    • Set the BT4CH_userParam_chX->en_bool = 1.
    • See Figure 3-19 for the Expression Window settings.
  5. The BT4CH_measureVI_chX variable shows output current and voltage of the DC/DC converter. Isense1_A display value is close to iref_A setting with ±1mA error.
  6. Figure 3-20 shows the SFRA setup to test the loop stability. Click on the Run SFRA icon from the SYSCONFIG page. The SFRA GUI pops up.
  7. Select the options for the device on the SFRA GUI; for example, for F28P65x, select Floating Point. Click on the Setup Connection button. In the pop-up window, uncheck the boot-on-connect option and select an appropriate COM port. Click the OK button. Return to the SFRA GUI and click the Connect button.
  8. The SFRA GUI connects to the device. A SFRA sweep can now be started by clicking Start Sweep. The complete SFRA sweep takes a few minutes to finish. Once complete, a graph with the measurement appears, as shown in Figure 3-21.
  9. The Frequency Response Data is saved in the project folder, under an SFRA Data folder, and is time-stamped with the time of the SFRA run.
TIDA-010090 Lab 2 Expression Window, Closed LoopFigure 3-19 Lab 2 Expression Window, Closed Loop
TIDA-010090 SFRA Setup for Closed-Loop Current ControlFigure 3-20 SFRA Setup for Closed-Loop Current Control
TIDA-010090 Current Control Closed-Loop Frequency ResponseFigure 3-21 Current Control Closed-Loop Frequency Response