关于DSP2812的死区设置问题

把你的初始化程序贴出来看一下， 可能是死区设置有问题

根据EV user guide的Figure 2−4和Figure 2−5在UP mode设置死区，是需要将CMP1设置成高电平有效，CMP2设置成低电平有效，如果在UP-DOWN mode设置死区，需要将CMP1设置成低电平有效，CMP2设置成高电平有效。

//EVA模块
EvaRegs.T1CON.bit.TMODE=1; //连续增/减模式
EvaRegs.T1CON.bit.TPS=0; //T1CLK=HSPCLK/1=75MHz
EvaRegs.T1CON.bit.TENABLE=0; //暂时禁止T1计数，主函数中会打开
EvaRegs.T1CON.bit.TCLKS10=0; //使用内部时钟T1CLK
EvaRegs.T1CON.bit.TECMPR=0; //禁止定时器比较操作

EvaRegs.T2CON.bit.TMODE=1; //连续增/减模式
EvaRegs.T2CON.bit.TPS=0; //T2CLK=HSPCLK/1=75MHz
EvaRegs.T2CON.bit.TENABLE=0; //暂时禁止T2计数，主函数中会打开
EvaRegs.T2CON.bit.TCLKS10=0; //使用内部时钟T2CLK
EvaRegs.T2CON.bit.TECMPR=0; //禁止定时器比较操作

EvaRegs.GPTCONA.bit.TCMPOE=0; //禁止定时器比较输出使能
EvaRegs.GPTCONA.bit.T1PIN=1; //低电平有效
EvaRegs.GPTCONA.bit.T2PIN=1; //低电平有效

EvaRegs.T1PR=uiFreq; //60kHz的PWM
EvaRegs.T1CMPR=uiCMPR11; //占空比为
EvaRegs.T1CNT=0;

EvaRegs.T2PR=uiFreq; //60kHz的PWM
EvaRegs.T2CMPR=uiCMPR11; //占空比为
EvaRegs.T2CNT=0;

EvaRegs.COMCONA.bit.CENABLE=1; //使能比较单元的比较操作
EvaRegs.COMCONA.bit.FCOMPOE=1; //全比较器输出使能
EvaRegs.COMCONA.bit.CLD=1; //下溢中断或周期匹配装载

//死区时间为：267ns
EvaRegs.DBTCONA.bit.DBT=5;
EvaRegs.DBTCONA.bit.EDBT1=1; //死区定时器1使能
EvaRegs.DBTCONA.bit.EDBT2=1; //死区定时器2使能
EvaRegs.DBTCONA.bit.EDBT3=1; //死区定时器3使能
EvaRegs.DBTCONA.bit.DBTPS=2; //死区定时器预定标因子Tdb=75MHz/4=18.75MHz

EvaRegs.ACTRA.all=0x0666; //PWM1,PWM3，PWM5输出高电平有效

EvaRegs.CMPR1=uiCMPR11; //PWM1,2占空比由中断函数决定
EvaRegs.CMPR2=uiCMPR22; //PWM3,4占空比由中断函数决定
EvaRegs.CMPR3=uiCMPR31; //PWM5,6占空比由中断函数决定

EvaRegs.EVAIMRA.bit.T1PINT=1; // 使能定时器T1周期中断
EvaRegs.EVAIMRA.bit.T1UFINT=1; // 使能定时器T1下溢中断

EvaRegs.EVAIFRA.all=0xFFFF; // 清除标志位

上面是EVA的初始化

下面是中断函数

interrupt void T1PINT_ISR(void) // EV-A，周期中断装载的是前半个周期的值,50%
{
EvaRegs.CMPR1 = uiCMPR11;
EvaRegs.CMPR2 = uiCMPR22;
EvaRegs.CMPR3 = uiCMPR31;

EvaRegs.EVAIFRA.all=BIT7;
// To receive more interrupts from this PIE group, acknowledge this interrupt
PieCtrlRegs.PIEACK.all = PIEACK_GROUP2;
EINT;

}

interrupt void T1UFINT_ISR(void) // EV-A，下溢中断装载的是后半个周期的值,50%
{
EvaRegs.CMPR1 = uiCMPR12;
EvaRegs.CMPR2 = uiCMPR21;
EvaRegs.CMPR3 = uiCMPR32;

EvaRegs.EVAIFRA.all=BIT9;
// To receive more interrupts from this PIE group, acknowledge this interrupt
PieCtrlRegs.PIEACK.all = PIEACK_GROUP2;
EINT;
}

我这个程序的目的是想产生三相PWM波，每相互补导通180°，A、B、C三相间相差120°