Hi,
My customer is developing a 3 phase full bridge inverter. He wants to change the frequency of each phase.
The waveform below is what he want to implement.
I have attached source code of PWM configuration.
It consists of EPWM1(Master) / EPWM2~EPMW6(Slave) and set the 3-phase PWM waveform to have a phase of 120 degrees as shown in above pictures
Three-phase consists of PWM1/2, 3/4 and 5/6 pairs.
void BSW_SET_Freq ( byte u8_ch, single f32_freq ) { ePWM_Regs[ u8_ch ]->TBPRD = ( word ) ( ( single ) CPU_SPD / ( f32_freq * 2.0f ) - 1.0F ); } void BSW_SET_Duty ( byte u8_ch, single f32_duty ) { ePWM_Regs[ u8_ch ]->CMPA.bit.CMPA = ( word )( ( single )ePWM_Regs[ u8_ch ]->TBPRD * f32_duty ); ePWM_Regs[ u8_ch ]->CMPB.bit.CMPB = ( word )( ( single )ePWM_Regs[ u8_ch ]->TBPRD * f32_duty ); } void BSW_updatePhase ( byte ch, single phase, byte LayerOn ) { word phaseCount=0; single DEGREE_SCALE; DEGREE_SCALE = 1.0f/180.0f; if(LayerOn == EN_CAN_On) { if( phase < 0.0f ) { ePWM_Regs[ ch ]->TBCTL.bit.PHSDIR = 1; phaseCount = ( word ) ( ( single ) ePWM_Regs[ ch ]->TBPRD * -phase * DEGREE_SCALE ); } else { ePWM_Regs[ ch ]->TBCTL.bit.PHSDIR = 0; phaseCount = ( word ) ( ( single ) ePWM_Regs[ ch ]->TBPRD * phase * DEGREE_SCALE ); } if (( ch == 1 ) || ( ch == 3 ) || ( ch == 6 )) { ePWM_Regs[ ch ]->TBPHS.bit.TBPHS = phaseCount; } else { ePWM_Regs[ ch ]->TBPHS.bit.TBPHS = phaseCount+LLC_ShiftTIME; } } else { ePWM_Regs[ ch ]->TBPHS.bit.TBPHS = 0; } } //EPWM1 Master 설정 void InitEPwm1Example ( void ) { // // Setup TBCLK // EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO; EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up EPwm1Regs.TBPRD = EPWM1_TIMER_TBPRD; // Set timer period EPwm1Regs.TBPHS.bit.TBPHS = 0x0000; // Phase is 0 EPwm1Regs.TBCTR = 0x0000; // Clear counter EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1; EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW; // // Setup shadow register load on ZERO // EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // // Set Compare values // EPwm1Regs.CMPA.bit.CMPA = EPWM1_MIN_CMPA; // Set compare A value EPwm1Regs.CMPB.bit.CMPB = EPWM1_MAX_CMPB; // Set Compare B value // // Set actions // EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; // Set PWM1A on Zero EPwm1Regs.AQCTLA.bit.CAD = AQ_SET; EPwm1Regs.AQCTLB.bit.CAU = AQ_CLEAR; // Set PWM1A on Zero EPwm1Regs.AQCTLB.bit.CAD = AQ_SET; EPwm1Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; EPwm1Regs.DBCTL.bit.IN_MODE = DBA_RED_DBB_FED; BSW_SET_Deadtime(1, LLC_DEADTIME); // // Interrupt where we will change the Compare Values // EPwm1Regs.ETSEL.bit.SOCAEN = 1; /* Enable SOC on B group */ EPwm1Regs.ETSEL.bit.SOCASEL = ET_CTR_ZERO; EPwm1Regs.ETPS.bit.SOCAPRD = ET_1ST; } //EPWM2 Slave 설정 void InitEPwm2Example ( void ) { EPwm2Regs.TBCTL.bit.PHSEN = TB_ENABLE; EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; //20210427 ygson modified, TB_SYNC_IN --> TB_CTR_ZERO EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up EPwm2Regs.TBPRD = EPWM2_TIMER_TBPRD; // Set timer period EPwm2Regs.TBPHS.bit.TBPHS = 60; // Phase is 0 EPwm2Regs.TBCTR = 0x0000; // Clear counter EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV1; EPwm2Regs.TBCTL.bit.PRDLD = TB_SHADOW; // // Setup shadow register load on ZERO // EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // // Set Compare values // EPwm2Regs.CMPA.bit.CMPA = EPWM2_MIN_CMPA; // Set compare A value EPwm2Regs.CMPB.bit.CMPB = EPWM2_MAX_CMPB; // Set Compare B value // // Set Actions // EPwm2Regs.AQCTLA.bit.CAU = AQ_SET; // Set PWM1A on Zero EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR; EPwm2Regs.AQCTLB.bit.CAU = AQ_SET; // Set PWM1A on Zero EPwm2Regs.AQCTLB.bit.CAD = AQ_CLEAR; EPwm2Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; EPwm2Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; EPwm2Regs.DBCTL.bit.IN_MODE = DBA_RED_DBB_FED; BSW_SET_Deadtime(2, LLC_DEADTIME); // // Interrupt where we will change the Compare Values // EPwm2Regs.ETSEL.bit.SOCAEN = 1; /* Enable SOC on B group */ EPwm2Regs.ETSEL.bit.SOCASEL = ET_CTR_ZERO; EPwm2Regs.ETPS.bit.SOCAPRD = ET_1ST; } //EPWM3 Slave 설정 void InitEPwm3Example ( void ) { // // Setup TBCLK // EPwm3Regs.TBCTL.bit.PHSEN = TB_ENABLE; EPwm3Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up EPwm3Regs.TBPRD = EPWM3_TIMER_TBPRD; // Set timer period EPwm3Regs.TBPHS.bit.TBPHS = 0x0000; // Phase is 0 EPwm3Regs.TBCTR = 0x0000; // Clear counter EPwm3Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT EPwm3Regs.TBCTL.bit.CLKDIV = TB_DIV1; EPwm3Regs.TBCTL.bit.PRDLD = TB_SHADOW; // // Setup shadow register load on ZERO // EPwm3Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; EPwm3Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; EPwm3Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; EPwm3Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // // Set Compare values // EPwm3Regs.CMPA.bit.CMPA = EPWM3_MIN_CMPA; // Set compare A value EPwm3Regs.CMPB.bit.CMPB = EPWM3_MAX_CMPB; // Set Compare B value // // Set actions // EPwm3Regs.AQCTLA.bit.CAU = AQ_CLEAR; // Set PWM1A on Zero EPwm3Regs.AQCTLA.bit.CAD = AQ_SET; EPwm3Regs.AQCTLB.bit.CAU = AQ_CLEAR; // Set PWM1A on Zero EPwm3Regs.AQCTLB.bit.CAD = AQ_SET; EPwm3Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; EPwm3Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; EPwm3Regs.DBCTL.bit.IN_MODE = DBA_RED_DBB_FED; BSW_SET_Deadtime(3, LLC_DEADTIME); // // Interrupt where we will change the Compare Values // EPwm3Regs.ETSEL.bit.SOCAEN = 1; /* Enable SOC on B group */ EPwm3Regs.ETSEL.bit.SOCASEL = ET_CTR_ZERO; EPwm3Regs.ETPS.bit.SOCAPRD = ET_1ST; } //EPWM4 Slave 설정 void InitEPwm4Example ( void ) { EPwm4Regs.TBCTL.bit.PHSEN = TB_ENABLE; EPwm4Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; //20210427 ygson modified, TB_SYNC_IN --> TB_CTR_ZERO EPwm4Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up EPwm4Regs.TBPRD = EPWM4_TIMER_TBPRD; // Set timer period EPwm4Regs.TBPHS.bit.TBPHS = 60; // Phase is 0 EPwm4Regs.TBCTR = 0x0000; // Clear counter EPwm4Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT EPwm4Regs.TBCTL.bit.CLKDIV = TB_DIV1; EPwm4Regs.TBCTL.bit.PRDLD = TB_SHADOW; // // Setup shadow register load on ZERO // EPwm4Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; EPwm4Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; EPwm4Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; EPwm4Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // // Set Compare values // EPwm4Regs.CMPA.bit.CMPA = EPWM4_MIN_CMPA; // Set compare A value EPwm4Regs.CMPB.bit.CMPB = EPWM4_MAX_CMPB; // Set Compare B value // // Set Actions // EPwm4Regs.AQCTLA.bit.CAU = AQ_SET; // Set PWM1A on Zero EPwm4Regs.AQCTLA.bit.CAD = AQ_CLEAR; EPwm4Regs.AQCTLB.bit.CAU = AQ_SET; // Set PWM1A on Zero EPwm4Regs.AQCTLB.bit.CAD = AQ_CLEAR; EPwm4Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; EPwm4Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; EPwm4Regs.DBCTL.bit.IN_MODE = DBA_RED_DBB_FED; BSW_SET_Deadtime(4, LLC_DEADTIME); // // Interrupt where we will change the Compare Values // EPwm4Regs.ETSEL.bit.SOCAEN = 1; /* Enable SOC on B group */ EPwm4Regs.ETSEL.bit.SOCASEL = ET_CTR_ZERO; EPwm4Regs.ETPS.bit.SOCAPRD = ET_1ST; } //EPWM5 Slave 설정 void InitEPwm5Example ( void ) { // // Setup TBCLK // EPwm5Regs.TBCTL.bit.PHSEN = TB_ENABLE; EPwm5Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; EPwm5Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up EPwm5Regs.TBPRD = EPWM5_TIMER_TBPRD; // Set timer period EPwm5Regs.TBPHS.bit.TBPHS = 60; // Phase is 0 EPwm5Regs.TBCTR = 0x0000; // Clear counter EPwm5Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT EPwm5Regs.TBCTL.bit.CLKDIV = TB_DIV1; EPwm5Regs.TBCTL.bit.PRDLD = TB_SHADOW; // // Setup shadow register load on ZERO // EPwm5Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; EPwm5Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; EPwm5Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; EPwm5Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // // Set Compare values // EPwm5Regs.CMPA.bit.CMPA = EPWM5_MIN_CMPA; // Set compare A value EPwm5Regs.CMPB.bit.CMPB = EPWM5_MAX_CMPB; // Set Compare B value // // Set Actions // EPwm5Regs.AQCTLA.bit.CAU = AQ_SET; // Set PWM1A on Zero EPwm5Regs.AQCTLA.bit.CAD = AQ_CLEAR; EPwm5Regs.AQCTLB.bit.CAU = AQ_SET; // Set PWM1A on Zero EPwm5Regs.AQCTLB.bit.CAD = AQ_CLEAR; EPwm5Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; EPwm5Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; EPwm5Regs.DBCTL.bit.IN_MODE = DBA_RED_DBB_FED; BSW_SET_Deadtime(5, LLC_DEADTIME); // // Interrupt where we will change the Compare Values // EPwm5Regs.ETSEL.bit.SOCAEN = 1; /* Enable SOC on B group */ EPwm5Regs.ETSEL.bit.SOCASEL = ET_CTR_ZERO; EPwm5Regs.ETPS.bit.SOCAPRD = ET_1ST; } //EPWM6 Slave 설정 void InitEPwm6Example ( void ) { // // Setup TBCLK // EPwm6Regs.TBCTL.bit.PHSEN = TB_ENABLE; EPwm6Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; EPwm6Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up EPwm6Regs.TBPRD = EPWM6_TIMER_TBPRD; // Set timer period EPwm6Regs.TBPHS.bit.TBPHS = 0x0000; // Phase is 0 EPwm6Regs.TBCTR = 0x0000; // Clear counter EPwm6Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT EPwm6Regs.TBCTL.bit.CLKDIV = TB_DIV1; EPwm6Regs.TBCTL.bit.PRDLD = TB_SHADOW; // // Setup shadow register load on ZERO // EPwm6Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; EPwm6Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; EPwm6Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; EPwm6Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // // Set Compare values // EPwm6Regs.CMPA.bit.CMPA = EPWM6_MIN_CMPA; // Set compare A value EPwm6Regs.CMPB.bit.CMPB = EPWM6_MAX_CMPB; // Set Compare B value // // Set Actions // EPwm6Regs.AQCTLA.bit.CAU = AQ_CLEAR; // Set PWM1A on Zero EPwm6Regs.AQCTLA.bit.CAD = AQ_SET; EPwm6Regs.AQCTLB.bit.CAU = AQ_CLEAR; // Set PWM1A on Zero EPwm6Regs.AQCTLB.bit.CAD = AQ_SET; EPwm6Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; EPwm6Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; EPwm6Regs.DBCTL.bit.IN_MODE = DBA_RED_DBB_FED; BSW_SET_Deadtime(6, LLC_DEADTIME); // // Interrupt where we will change the Compare Values // EPwm6Regs.ETSEL.bit.SOCAEN = 1; /* Enable SOC on B group */ EPwm6Regs.ETSEL.bit.SOCASEL = ET_CTR_ZERO; EPwm6Regs.ETPS.bit.SOCAPRD = ET_1ST; }
When slave frequency is changed to be smaller than the master, PWM is not output.
Could I get any advice on this problem?
And could I get some examples related to 3phase full bridge inverter?