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TMS320F280040: Adding deadband delay for ePWM

Pratik Naphade
Intellectual 440 points

Part Number: TMS320F280040

Hi team, I am using TMS320F280040 the application of DCDC converter.

I have inverted the two PWM waveforms ePWM1A and ePWM1B.

Now I want to add some deadband delay between rising edge and falling edge.

I have gone through the example code given by c2000 compiler but I am missing something

I am attaching my code copy, please guide me where I am missing.

EPwm1Regs.TBSTS.all=0;                       // Time base status register initialization

      EPwm1Regs.TBPHS.bit.TBPHS = 0x0000;   // Phase is 0
      EPwm1Regs.TBCTR = 0x0000;                // Clear counter
      EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;   //Up-down-count mode
      EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;//TB_DIV4;
      EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1;//TB_DIV4;
      EPwm1Regs.TBCTL.bit.FREE_SOFT=0;

      EPwm1Regs.TBPRD = 500;//PWM_PERIOD_VALUE ;   // Set timer period 801 TBCLKs

      EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;//CC_LD_DISABLE;   //Forbidden shadow register A loading
      EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;//CC_LD_DISABLE;   // Forbidden shadow register B loading
      EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;//CC_IMMEDIATE;    //CMPA loads immediately
      EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;//CC_IMMEDIATE;    //CMPB loads immediately

      EPwm1Regs.AQCTLA.bit.CAU = AQ_SET;             // Set PWM1A on Zero
      EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR;

      EPwm1Regs.DBCTL.bit.DEDB_MODE = DB_FULL_ENABLE; // enable Dead-band module
      //EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_LOC;//DB_ACTV_HIC; // Active Hi complementary
      EPwm1Regs.DBCTL.bit.IN_MODE = DBA_ALL;
      EPwm1Regs.DBFED.bit.DBFED = EPWM1_FED_DB;
      EPwm1Regs.DBRED.bit.DBRED = EPWM1_RED_DB;

//for 20% duty cycle
      EPwm1Regs.CMPA.bit.CMPA=100;//PWM_PERIOD_VALUE/2;//50%DUTYCYCLE // 4us off, 16us on
      EPwm1Regs.CMPB.bit.CMPB=400;//PWM_PERIOD_VALUE/2; // 4us on, 16us off


//      EPwm1Regs.AQCTLB.bit.CBU = AQ_SET;             // Set PWM1A on Zero
//      EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR;
      EPwm1Regs.AQCTLB.bit.CAU = AQ_CLEAR;             // Set PWM1A on Zero
      EPwm1Regs.AQCTLB.bit.CAD = AQ_SET;

      EPwm1Regs.AQSFRC.all=0; //Action forced register clear 0

      EPwm1Regs.AQCSFRC.all = 0;

Thanks 

Pratik