EPWM3.4 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。
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4. 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
   }