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?
