TIDUEO1B April   2021  – June 2021

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  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

4.1.2.1 Software Control Flow

GUID-CD297C89-CDAC-4856-AEE3-A8037821B1E2-low.gifFigure 4-3 Project Structure Overview

Solution specific and device independent files are <solution>.c/h. Board-specific and device-specific files are <solution>_hal.c/h. The main.c file of the project consists of the main function of the C project as well as ISR framework and calls routines in other files. <solution>_settings.h and <solution>_user_settings.h consist of all the settings required for the solution.

<solution>_user_settings.h For this design, <solution> is psfbpcmc.

<solution>_clatask.cla file include the CLA Task definitions.

The powerSUITE page can be opened by clicking the main.syscfg file, listed below the project explorer.

The powerSUITE page generates the <solution>_settings.h file. This file is the only file used in the compile of the project that is generated by the powerSUITE page. The user must not modify this file manually, as the changes will be overwritten by powerSUITE each time the project is rebuilt. The changes will only happen after rebuilding the entire project TheKit.json and solution.js files are used internally by the powerSUITE and must also not be modified by the user. Any changes to these files will result in the project not functioning properly.

GUID-20201007-CA0I-HBGL-01VB-N5VFMPS2HD68-low.gifFigure 4-4 PCMC Software Flow

In Figure 4-4, the project consists of an interrupt service routine, which is called every PWM cycle, called ISR1(), where the control algorithm is executed. In addition to this, there are background tasks, which are called in a polling fashion and can be used to run slow tasks for which absolute timing accuracy is not required.

The system is controlled by two feedback loops; an outer voltage loop, implemented using software control block, and an inner peak current loop, implemented using the on-chip analog comparator, DAC and PWM hardware resources. The voltage loop controller is executed at a rate of 100 kHz (same as the PWM frequency).