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

3.4.7 Calibration

  1. To run this lab, make sure the hardware is set up as shown in Figure 3-11. The 2-points calibration method is used to calibrate gain and offset errors.
  2. To measure current, use an external precision resistor and a DMM, or you can use E-Load current readings. Alternatively, voltage across sense resistors on the TIDA-010090 boards can be used to measure the output current. To measure voltage, use a DMM across the buck converter output voltage and remote sense connections.
  3. Open the SYSCONFIG page, select Lab 5, and set Calibration Mode to Current Calibration. Figure 3-32 shows the SYSCONFIG page setting for current calibration.
    • Save the SYSCONFIG page, and run the code.
    • Open the Expression Window.
    • The output current is updated using BT4PH_userParam_V_I_chX->ibatCal_pu parameter.
    • Set the BT4CH_userParam_chX->Relay_ON to 1 to enable the output relay.
    • Set the BT4CH_userParam_chX->en_bool = 1.
    • Set the BT4CH_userParam_chX->ibatCal_pu to "0.05" and "0.3", and note the output current readings.
    • Update the actual output current readings in bt4ch_gan_cal.h file.
    #define BT4CH_IBAT_ACTUAL_CH1_P1_A ((float32_t)2.5)
#define BT4CH_IBAT_ACTUAL_CH1_P2_A ((float32_t)15.00)
    • Repeat the steps for channel 2, 3 and 4.

  4. Open the SYSCONFIG page, select Lab 5, and set Calibration Mode to Voltage Calibration. Figure 3-33 shows the SYSCONFIG page setting for voltage calibration.

    • Save the SYSCONFIG page, and run the code.
    • Open the Expression Window.
    • The output current is updated using BT4PH_userParam_V_I_chX->vbatCal_pu parameter.
    • Set the BT4CH_userParam_chX->Relay_ON to 1 to enable the output relay.
    • Set the BT4CH_userParam_chX->en_bool = 1.
    • Set the BT4CH_userParam_chX->vbatCal_pu to "0.2" and "0.6", and note the output current readings. Update the actual output current readings in bt4ch_cal.h file.
      #define BT4CH_VBAT_ACTUAL_CH1_P1_V ((float32_t)1.195)
#define BT4CH_VBAT_ACTUAL_CH1_P2_V ((float32_t)3.589)
    • Repeat the steps for channel 2, 3 and 4.
  5. Open the SYSCONFIG page, disable the calibration mode.
  6. When using non-powerSuite version of the project, Build Settings are directly modified in solution_settings.h file. Set CALIBRATION_MODE to (1) for current calibration, and (2) for voltage calibration.
    #define LAB_NUMBER (5)
#define CHANNEL_NUMBER (5)
#define CALIBRATION_ENABLED (true)
#define CALIBRATION_MODE (1)
TIDA-010090 Build Options for Current CalibrationFigure 3-32 Build Options for Current Calibration
TIDA-010090 Build Options for Voltage CalibrationFigure 3-33 Build Options for Voltage Calibration
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