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  • C2000 ePWM Developer’s Guide

    • SPRAD12A July   2022  – February 2023 F29H850TU , F29H859TU-Q1 , TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1 , TMS320F280033 , TMS320F280034 , TMS320F280034-Q1 , TMS320F280036-Q1 , TMS320F280036C-Q1 , TMS320F280037 , TMS320F280037-Q1 , TMS320F280037C , TMS320F280037C-Q1 , TMS320F280038-Q1 , TMS320F280038C-Q1 , TMS320F280039 , TMS320F280039-Q1 , TMS320F280039C , TMS320F280039C-Q1 , TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1 , TMS320F28075 , TMS320F28075-Q1 , TMS320F28076 , TMS320F28374D , TMS320F28374S , TMS320F28375D , TMS320F28375S , TMS320F28375S-Q1 , TMS320F28376D , TMS320F28376S , TMS320F28377D , TMS320F28377D-EP , TMS320F28377D-Q1 , TMS320F28377S , TMS320F28377S-Q1 , TMS320F28378D , TMS320F28378S , TMS320F28379D , TMS320F28379D-Q1 , TMS320F28379S , TMS320F28384D , TMS320F28384D-Q1 , TMS320F28384S , TMS320F28384S-Q1 , TMS320F28386D , TMS320F28386D-Q1 , TMS320F28386S , TMS320F28386S-Q1 , TMS320F28388D , TMS320F28388S , TMS320F28P550SG , TMS320F28P550SJ , TMS320F28P559SG-Q1 , TMS320F28P559SJ-Q1 , TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1

       

  • CONTENTS
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  • C2000 ePWM Developer’s Guide
  1.   Abstract
  2.   Trademarks
  3. 1 Introduction
  4. 2 SysConfig
  5. 3 Time-Base (TB) Submodule
    1. 3.1 Setting the Frequency
    2. 3.2 Applying a Phase Shift
    3. 3.3 Setting up the Synchronization (Sync) Scheme
  6. 4 Counter-Compare (CC) and Action-Qualifier (AQ) Submodules
    1. 4.1 Calculating the Duty Cycle
  7. 5 Deadband (DB) Submodule
    1. 5.1 Setting up Signal Pairs
  8. 6 Verifying the Output
    1. 6.1 Checking the Duty Cycle and Dead-Time Insertion
    2. 6.2 Checking the Phase Shift Applied
  9. 7 Trip-Zone (TZ) and Digital Compare (DC) Submodules
    1. 7.1 Drive Outputs Low for an ePWM Cycle Upon Trip Condition Set Through CMPSS
    2. 7.2 Drive Outputs Low Until Cleared Through Software Upon Trip Condition set Through GPIO
  10. 8 Event-Trigger (ET) Submodule
    1. 8.1 Setting Up Time-Base Interrupts
  11. 9 Global Load
    1. 9.1 Applying Global Loading and One-Shot Load Feature
    2. 9.2 Linking the ePWM Modules
    3. 9.3 Updating Action Qualifier Settings and Counter Compare Values Through Global Loading
  12. 10Summary
  13. 11References
  14. 12Revision History
  15. IMPORTANT NOTICE
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APPLICATION NOTE

C2000 ePWM Developer’s Guide

Abstract

The enhanced pulse width modulator (ePWM) peripheral is a key element in controlling many of the power electronic systems found in both industrial and automotive applications. C2000™ real-time microcontrollers offer many differentiated features within the ePWM peripheral that allow for advanced control techniques. This application note focuses on an application use-case described within the introduction, demonstrating each of the features of the ePWM along with how to use SysConfig system configuration tool to set-up and program the desired outputs. SysConfig is a tool that exists integrated in Code Composer Studio™ (CCS) or as a standalone program that allows you to generate C header and code files using a graphical user interface (GUI). This application note was done using the TMS320F28388D device. However, the content in this application note is applicable to all devices with a Type-4 ePWM module. For more information on peripheral types, see the C2000 Real-Time Control MCU Peripherals Guide.

Trademarks

C2000™ and Code Composer Studio™ are trademarks of Texas Instruments.

All trademarks are the property of their respective owners.

1 Introduction

The ePWM module is separated into submodules, each with their own functionality. #FIG_RDT_LRW_WTB shows how the submodules are connected to each other. Throughout this application report, each of the different submodules is explained in detail.

GUID-20220524-SS0I-TQ2H-8QGF-BQ9FM8LKC3Q5-low.gifFigure 1-1 Block Diagram for the ePWM Module

The application use-case that is discussed throughout this application report has the following criteria:

Use-Case

  • Output frequency of 400 kHz for EPWM1/2/3
  • Phase shift of 120° for EPWM2 with respect to EPWM1
  • Phase shift of 240° for EPWM3 with respect to EPWM1
  • Duty cycle of 45% for EPWM1/2/3
  • Active high complementary signal pairs with 200 nsec of rising/falling edge delay for EPWM1/2/3
  • Cycle-by-Cycle trip zone protection through comparator signal on EPWM2
  • One-Shot trip protection through general-purpose input/output (GPIO) on EPWM3
  • Interrupt generation every time the time-base counter equals zero on EPWM1
  • Global loading to support asynchronous updates of action qualifier settings
  • Link CMPA/CMPB of EPWM1 to EPWM2 and EPWM3

 
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