TIDUEY0A November   2020  – December 2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Li-ion Cell Formation Equipment
    2. 1.2 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 System Design Theory
      1. 2.2.1 Feedback Controller
      2. 2.2.2 DC/DC Start-Up
      3. 2.2.3 High-Resolution PWM Generation
      4. 2.2.4 Output Inductor and Capacitor Selection
      5. 2.2.5 Current and Voltage Feedback
    3. 2.3 Highlighted Products
      1. 2.3.1 TMS320F28P650DK
      2. 2.3.2 ADS9324
      3. 2.3.3 INA630
      4. 2.3.4 UCC27284
      5. 2.3.5 REF50E
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Software
      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 Test Bidirectional Power Flow
      2. 3.3.2 Hardware Setup to Tune the Current and Voltage Loop
      3. 3.3.3 Hardware Setup for Current and Voltage Calibration
      4. 3.3.4 Lab Variables Definitions
      5. 3.3.5 Test Procedure
        1. 3.3.5.1 Lab 1. Open-Loop Current Control Single Phase
          1. 3.3.5.1.1 Setting Software Options for Lab 1
          2. 3.3.5.1.2 Building and Loading the Project and Setting up Debug Environment
          3. 3.3.5.1.3 Running the Code
        2. 3.3.5.2 Lab 2. Closed Loop Current Control Single Channel
          1. 3.3.5.2.1 Setting Software Options for Lab 2
          2. 3.3.5.2.2 Building and Loading the Project and Setting up Debug Environment
          3. 3.3.5.2.3 Run the Code
        3. 3.3.5.3 Lab 3. Open Loop Voltage Control Single Channel
          1. 3.3.5.3.1 Setting Software Options for Lab 3
          2. 3.3.5.3.2 Building and Loading the Project and Setting up Debug Environment
          3. 3.3.5.3.3 Running the Code
        4. 3.3.5.4 Lab 4. Closed Loop Current and Voltage Control Single Channel
          1. 3.3.5.4.1 Setting Software Options for Lab 4
          2. 3.3.5.4.2 Building and Loading the Project and Setting up Debug Environment
          3. 3.3.5.4.3 Running the Code
        5. 3.3.5.5 Lab 5. Closed Loop Current and Voltage Control Four Channels
          1. 3.3.5.5.1 Setting Software Options for Lab 5
          2. 3.3.5.5.2 Building and Loading the Project and Setting up Debug Environment
          3. 3.3.5.5.3 Running the Code
        6. 3.3.5.6 Calibration
    4. 3.4 Test Results
      1. 3.4.1 Current Load Regulation
      2. 3.4.2 Voltage Load Regulation
      3. 3.4.3 Current Linearity Test
      4. 3.4.4 Voltage Loop Linearity Test
      5. 3.4.5 Bidirectional Current Switching Time
      6. 3.4.6 Current Step Response
  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
  12. 6Revision History
3.3.5.4.3 Running the Code

Use the following steps to run the code for Lab 4:

  1. Use the test setup shown in Section 3.3.1.
  2. Run the project by clicking TIDA-010086 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 = 8.5
    • BT4CH_userParam_chX->vrefCharge_V = 0.075
    • Set the BT4CH_userParam_chX->en_bool = 1
    • See Figure 3-28 for the Expression Window settings
  5. The BT4CH_measureVI_chX variable shows the output current and voltage of the DC/DC converter. Vbatsense_V display value is close to vrefCharge_V with ±0.5mV error.
  6. Figure 3-29 shows the SFRA setup to measure Closed-Loop Voltage Control Frequency Response.
  7. Click on the Run SFRA icon from the SYSCONFIG page. The SFRA GUI pops up
  8. Select the options for the device on the SFRA GUI; for example, for F28P65x, select Floating Point. Click 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 select the Connect button.
  9. The SFRA GUI connects to the device. An SFRA sweep can now be started by clicking the Start Sweep button. The complete SFRA sweep takes a few minutes to finish. Once complete, a graph with the measurement appears, as shown in Figure 3-30.
  10. 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.
  11. After finishing the lab, set the following parameters from the Expression Window to stop the code:
    • BT4CH_userParam_chX->iref_A = 0
    • BT4CH_userParam_chX->vrefCharge_V = 0
    • Set the BT4CH_userParam_chX->en_bool = 0
    • Set the BT4CH_userParam_chX->Relay_ON to 0 to disable the output relay
    • Terminate the program
TIDA-010086 Lab 4 Expression Window, Closed LoopFigure 3-28 Lab 4 Expression Window, Closed Loop
TIDA-010086 SFRA Setup for Closed-Loop Voltage ControlFigure 3-29 SFRA Setup for Closed-Loop Voltage Control
TIDA-010086 Voltage Control Closed-Loop Frequency ResponseFigure 3-30 Voltage Control Closed-Loop Frequency Response