JAJU819B April   2021  – June 2021

 

  1.   概要
  2.   リソース
  3.   特長
  4.   アプリケーション
  5.   5
  6. 1General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  7. 2System Description
    1. 2.1 Key System Specifications
  8. 3System Overview
    1. 3.1 Block Diagram
    2. 3.2 Design Considerations
      1. 3.2.1 Basic Operation
      2. 3.2.2 PCMC PSFB using C2000
    3. 3.3 System Design Theory
      1. 3.3.1 Peak Current Mode Control (PCMC) Implementation
      2. 3.3.2 Zero Voltage Switching (ZVS) or Low Voltage Switching (LVS)
      3. 3.3.3 Synchronous Rectification
      4. 3.3.4 Slope Compensation
    4. 3.4 Highlighted Products
      1. 3.4.1 C2000™ MCU F28004x
  9. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Required Hardware and Software
      1. 4.1.1 Hardware
      2. 4.1.2 Software
        1. 4.1.2.1 Software Control Flow
        2. 4.1.2.2 Incremental Builds
        3. 4.1.2.3 Procedure for running the incremental builds - PCMC
          1. 4.1.2.3.1 Build 1: Peak Current Loop Check with Open Voltage Loop
            1. 4.1.2.3.1.1 Objective
            2. 4.1.2.3.1.2 Overview
            3. 4.1.2.3.1.3 Procedure
              1. 4.1.2.3.1.3.1 Start CCS and Open a Project
              2. 4.1.2.3.1.3.2 Build and Load the Project
              3. 4.1.2.3.1.3.3 Debug Environment Windows
              4. 4.1.2.3.1.3.4 Using Real-Time Emulation
              5. 4.1.2.3.1.3.5 Run the Code
          2. 4.1.2.3.2 Build 2: Closed current and voltage loop (Full PSFB)
            1. 4.1.2.3.2.1 Objective
            2. 4.1.2.3.2.2 Overview
            3. 4.1.2.3.2.3 Procedure
              1. 4.1.2.3.2.3.1 Build and Load Project
              2. 4.1.2.3.2.3.2 Debug Environment Windows
              3. 4.1.2.3.2.3.3 Run the Code
      3. 4.1.3 Test results
  10. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Software
    3. 5.3 Documentation Support
  11. 6Terminology
  12. 7About the Author
  13. 8Revision History
4.1.2.3.1.3.5 Run the Code
GUID-20201007-CA0I-58WM-TPGG-RHTFCDCFVSMP-low.png Figure 4-8 Build 1 Expression Window
  1. Run the code by using the <F8> key, or using the Run button on the toolbar.
  2. Apply an appropriate resistive load to the PSFB system at the DC output. A load that draws around 3A – 6A current at 12 V output is a good starting point.
  3. Set PSFB_gui_icommand_Set_Amps to be 0.5.
  4. Set PSFB_enable to be 1. This enables PWM output. The expression window is similar to Figure 4-8.
  5. Power the input at J1, J2 with 390 V DC. The output will be around 1.6 V (5A constant current load).
  6. Slowly increase PSFB_gui_icommand_Set_Amps to be 2.35 in increments of 0.05. Carefully observe the output voltage(PSFB_guiLVbus_Volts), the voltage should gradually increase to 12 V. This should not be allowed to exceed the capabilities of the board. Different waveforms, like the PWM gate drive signals, input voltage and current and output voltage may also be probed using an oscilloscope. Appropriate safety precautions should be taken and appropriate grounding requirements should be considered while probing these high voltages and high currents for this isolated DC-DC converter.
  7. The PSFB_slope is set to be 30. User can gradually increase or decrease it for testing.
  8. Fully halting the MCU when in real-time mode is a two-step process. With the 400 V DC input turned off wait a few seconds. First, halt the processor by using the Halt button on the toolbar, or by using Target > Halt. Then click the GUID-AA427CEB-602A-423D-A66D-84CCB9F329AB-low.gifbutton again to take the MCU out of real-time mode and then reset the MCU.