3.4 _Controlling Multiple Buck Converters With Same Frequencies_用相同频率控制多个降压转换器

1.如果需要同步，ePWM模块2可以配置为从机，并且可以在模块1的整数倍(N)频率下工作。从主机到从机的同步信号确保这些模块保持锁定。图51显示了这样的配置；图52显示了配置产生的波形。

2.

 

 

 

void InitEPwm1Example()
{
    // EPWM Module 1 config
    EPwm1Regs.TBPRD = 600; // Period = 1200 TBCLK counts
    EPwm1Regs.TBPHS.half.TBPHS = 0; // Set Phase register to zero
    EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Symmetrical mode
    EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Master module（主机）
    EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;
    EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO; // Sync down-stream module
    EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
    EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
    EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero
    EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero
    EPwm1Regs.AQCTLA.bit.CAU = AQ_SET; // set actions for EPWM1A
    EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR;
    EPwm1Regs.AQCTLB.bit.CBU = AQ_SET; // set actions for EPWM1B
    EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR;

    EPwm1Regs.CMPA.half.CMPA = 400; // adjust duty for output EPWM1A
    EPwm1Regs.CMPB = 200; // adjust duty for output EPWM1B

}


void InitEPwm2Example()
{
    // EPWM Module 2 config
    EPwm2Regs.TBPRD = 600; // Period = 1200 TBCLK counts
    EPwm2Regs.TBPHS.half.TBPHS = 0; // Set Phase register to zero
    EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Symmetrical mode
    EPwm2Regs.TBCTL.bit.PHSEN = TB_ENABLE; // 从机使能
    EPwm2Regs.TBCTL.bit.PRDLD = TB_SHADOW;
    EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // sync flow-through（同步信号流入）
    EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
    EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
    EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero
    EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero
    EPwm2Regs.AQCTLA.bit.CAU = AQ_SET; // set actions for EPWM2A
    EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR;
    EPwm2Regs.AQCTLB.bit.CBU = AQ_SET; // set actions for EPWM2B
    EPwm2Regs.AQCTLB.bit.CBD = AQ_CLEAR;

    EPwm2Regs.CMPA.half.CMPA = 500; // adjust duty for output EPWM2A
    EPwm2Regs.CMPB = 300; // adjust duty for output EPWM2B
}