工具/软件：
尊敬的专家：
我的客户 使用单相逆变器、一个电桥为50Hz、另一个为20kHz。 他们希望在检测到 AC (50Hz)零点时实现电平反向添加死区。 其当前的方法是在交流电达到零点时关闭上部和下部器件一个 PWM 周期(50us)、然后进行切换。 但是、交流波形会在零点引起抖动、客户想问是否有解决方案、在上下器件之间切换时是否可以自动添加死区？ 由于频率为50Hz、TBPRD 寄存器将会溢出、因此它们可以使用 AQCSFRC 来实现 PWM。 我将代码和波形附加在此处。
#define EPWM_FREQ_VALUE (1000000000)// 100MHz
#define INV_EPWMP_FREQ (20e3)//单位：kHz
#define INV_EPWM_PRID_VALUE (uint16_t)(EPWM_FREQ_VALUE /(INV_EPWMP_FREQ * 2))
//初始化 EPWM1模块函数配置
void Init_EPWM1_handle (void)
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EPwm1Regs.TBPRD = INV_EPWM_PRID_VALUE；// PWM 频率
EPwm1Regs.CMPA.bit.CMPA = INV_EPWM_PRID_VALUE - 20；//最初设置占空比200ns
EPwm1Regs.CMPA.bit.CMPAHR = 0x0000；//0x7F00；//初始化 HRPWM 扩展
EPwm1Regs.CMPB.bit.CMPB = 20；//初始值为200ns
EPwm1Regs.CMPB.bit.CMPBHR = 0x0000；//0x7F00；//初始化 HRPWM 扩展
EPwm1Regs.TBCTR = 0；
EPwm1Regs.TBPHS.bit.TBPHS = 0；
EPwm1Regs.TBCTL.ALL = 0；
EPwm1Regs.TBCTL.BIT.PRDLD = TB_SHADOW；
EPwm1Regs.TBCTL.BIT.CTRMODE = TB_COUNT_UPdown；
EPwm1Regs.TBCTL.BIT.HSPCLKDIV = TB_DIV1；
EPwm1Regs.TBCTL.BIT.CLKDIV = TB_DIV1；
EPwm1Regs.TBCTL.BIT.FREE_SOFT = mPWM_DEBUG_STOP；
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE；
EPwm1Regs.TBCTL.BIT.SWFSYNC = 1；
EPwm1Regs.TBCTL.bit.PHSDIR = TB_UP；
EPwm1Regs.TBCTL.BIT.PHSEN = TB_DISABLE；
EPwm1Regs.CMPCTL.all = 0；
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；
EPwm1Regs.AQCTLA.bit.cad = AQ_SET；
EPwm1Regs.AQCTLA.bit.CAU = AQCLEAR；
EPwm1Regs.AQCTLB.bit.CBU = AQ_SET；
EPwm1Regs.AQCTLB.bit.CBD = AQCLEAR；
EPwm1Regs.AQCSFRC.bit.CSFA = 1；
EPwm1Regs.AQCSFRC.bit.CSFB = 1；
EPwm1Regs.DBCTL.bit.IN_MODE = 1；
EPwm1Regs.DBCTL.BIT.DEDB_MODE = 0；
EPwm1Regs.DBCTL.BIT.POLSEL = 0；
EPwm1Regs.DBCTL.BIT.OUT_MODE =0；
EPwm1Regs.DBRED.bit.DBRED = 0；
EPwm1Regs.DBFED.bit.DBFED = 0；
EPwm1Regs.DBCTL.BIT.OUTSWAP =0；
//初始化 ISR()
EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO；
EPwm1Regs.ETPS.bit.INTPRD = ET_1st；
EPwm1Regs.ETCLR.bit.INT = 1；
EPwm1Regs.ETSEL.bit.intEn = 0；
}
//初始化 EPWM2模块函数配置
void Init_EPWM2_handle (void)
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EPwm2Regs.TBPRD = INV_EPWM_PRID_VALUE；// PWM 频率
EPwm2Regs.CMPA.bit.CMPA = INV_EPWM_PRID_VALUE - 20；//最初设置200ns
EPwm2Regs.CMPA.bit.CMPAHR = 0x0000；//0x7F00；//初始化 HRPWM 扩展
EPwm2Regs.CMPB.bit.CMPB = 20；//初始设置200ns
EPwm2Regs.CMPB.bit.CMPBHR = 0x0000；//0x7F00；//初始化 HRPWM 扩展
EPwm2Regs.TBCTR = 0；
EPwm2Regs.TBPHS.bit.TBPHS = 0；
EPwm2Regs.TBCTL.ALL = 0；
EPwm2Regs.TBCTL.BIT.PRDLD = TB_SHADOW；//设置立即加载
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN；
EPwm2Regs.TBCTL.BIT.HSPCLKDIV = TB_DIV1；
EPwm2Regs.TBCTL.BIT.CLKDIV = TB_DIV1；
EPwm2Regs.TBCTL.bit.FREE_SOFT = mPWM_DEBUG_STOP；//contu
EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE；//TB_SYNC_DISABLE；
EPwm2Regs.TBCTL.bit.SWFSYNC = 1；//软件触发一次性 syncon
EPwm2Regs.TBCTL.bit.PHSDIR = TB_UP；同步后进行//con up
EPwm2Regs.TBCTL.BIT.PHSEN = TB_DISABLE；
EPwm2Regs.CMPCTL.all = 0；
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；
EPwm2Regs.AQCTLA.bit.CAU = AQ_SET；
EPwm2Regs.AQCTLA.bit.cad = AQCLEAR；
EPwm2Regs.AQCTLB.bit.CBU = AQCLEAR；
EPwm2Regs.AQCTLB.bit.CBD = AQ_SET；
EPwm2Regs.AQCSFRC.bit.CSFA = 1；
EPwm2Regs.AQCSFRC.bit.CSFB = 1；
EPwm2Regs.DBCTL.bit.IN_MODE = 1；
EPwm2Regs.DBCTL.BIT.DEDB_MODE = 0；
EPwm2Regs.DBCTL.BIT.POLSEL = 0；
EPwm2Regs.DBCTL.BIT.OUT_MODE =0；
EPwm2Regs.DBRED.bit.DBRED = 0；
EPwm2Regs.DBFED.bit.DBFED = 0；
EPwm2Regs.DBCTL.BITS.OUTSWAP =0；
}
void INV_SPWM_Handle (void)
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开关(Phase_Sin)
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情况0x10：//ZeroCross = 0 Vac_Phase_Count
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EPwm2Regs.CMPA.bit.CMPA = DCAControl_FOC.PFC_PERIOD - DCAControl_FOC.PFC_DUTY；
EPwm2Regs.CMPB.bit.CMPB = DCAControl_FOC.PFC_PERIOD - DCAControl_FOC.PFC_DUTY - DCAControl_FOC.PFC_DUTY_DT；
EPwm1Regs.AQCSFRC.bit.CSFA = eForceLow；//ePWM1_A 低电平
EPwm1Regs.AQCSFRC.bit.CSFB = eForceLow；//ePWM1_B 低电平
EPwm2Regs.AQCSFRC.bit.CSFA = eNoForce；//ePWM2释放
EPwm2Regs.AQCSFRC.bit.CSFB = eNoForce；//ePWM2释放
休息；
}
Case 0x11：//USB Vac_Phase_Count = 0 ~ 200
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EPwm2Regs.CMPA.bit.CMPA = DCAControl_FOC.PFC_PERIOD - DCAControl_FOC.PFC_DUTY；
EPwm2Regs.CMPB.bit.CMPB = DCAControl_FOC.PFC_PERIOD - DCAControl_FOC.PFC_DUTY - DCAControl_FOC.PFC_DUTY_DT；
EPwm1Regs.AQCSFRC.bit.CSFA = eForceLow；//ePWM1_A 低电平
EPwm1Regs.AQCSFRC.bit.CSFB = eForceHigh；//ePWM1_B 高电平
EPwm2Regs.AQCSFRC.bit.CSFA = eNoForce；//ePWM2释放
EPwm2Regs.AQCSFRC.bit.CSFB = eNoForce；//ePWM2释放
休息；
}
案例0x20：//ZeroCross = 200 Vac_Phase_Count
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EPwm2Regs.CMPA.bit.CMPA = DCAControl_FOC.PFC_DUTY + DCAControl_FOC.PFC_DUTY_DT；
EPwm2Regs.CMPB.bit.CMPB = DCAControl_FC.PFC_DUTY；
EPwm1Regs.AQCSFRC.bit.CSFA = eForceLow；//ePWM1_A 低电平
EPwm1Regs.AQCSFRC.bit.CSFB = eForceLow；//ePWM1_B 低电平
EPwm2Regs.AQCSFRC.bit.CSFA = eNoForce；//ePWM2释放
EPwm2Regs.AQCSFRC.bit.CSFB = eNoForce；//ePWM2释放
休息；
}
案例0x21 :// Vac_Phase_Count = 200 ~ 400
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EPwm2Regs.CMPA.bit.CMPA = DCAControl_FOC.PFC_DUTY + DCAControl_FOC.PFC_DUTY_DT；
EPwm2Regs.CMPB.bit.CMPB = DCAControl_FC.PFC_DUTY；
EPwm1Regs.AQCSFRC.bit.CSFA = eForceHigh；//ePWM1_A 高电平
EPwm1Regs.AQCSFRC.bit.CSFB = eForceLow；//ePWM1_B 低电平
EPwm2Regs.AQCSFRC.bit.CSFA = eNoForce；//ePWM2释放
EPwm2Regs.AQCSFRC.bit.CSFB = eNoForce；//ePWM2释放
休息；
}
默认值：
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EPwm1Regs.AQCSFRC.bit.CSFA = eForceLow；//1
EPwm1Regs.AQCSFRC.bit.CSFB = eForceLow；//1
EPwm2Regs.AQCSFRC.bit.CSFA = eForceLow；//1
EPwm2Regs.AQCSFRC.bit.CSFB = eForceLow；//1
休息；
}
}
}
