请教一个 28377S SPWM 波形莫名地周期性出现满占空比的问题

满占空比的原因是因为你的表里的duty和周期值一样大了。和芯片本身没有关系。

你这个看的不是很明显     没有表现是SPWM波的情况啊  

我以前做看着效果很好   LC滤波输出效果很好

我觉得应该是你的正弦波不太好吧

所以我特别说了下，检查了正弦表数据无误，我把代码贴出来吧......

#include "F28x_Project.h"

unsigned int sinetable[]=
{
317,322,327,332,336,341,346,351,356,361,366,370,375,380,385,389,394,399,404,408,413,418,422,427,431,436,440,445,449,453,458,462,466,471,475,479,483,487,491,495,499,503,507,511,514,518,522,525,529,532,536,539,542,546,549,552,555,558,561,564,567,570,572,575,578,580,583,585,587,590,592,594,596,598,600,602,603,605,607,608,610,611,612,614,615,616,617,618,619,620,620,621,622,622,623,623,623,623,623,623,623,623,623,623,623,622,622,621,620,620,619,618,617,616,615,614,612,611,610,608,607,605,603,602,600,598,596,594,592,590,587,585,583,580,578,575,572,570,567,564,561,558,555,552,549,546,542,539,536,532,529,525,522,518,514,511,507,503,499,495,491,487,483,479,475,471,466,462,458,453,449,445,440,436,431,427,422,418,413,408,404,399,394,389,385,380,375,370,366,361,356,351,346,341,336,332,327,322,317,312,307,302,297,292,288,283,278,273,268,263,258,254,249,244,239,235,230,225,220,216,211,206,202,197,193,188,184,179,175,171,166,162,158,153,149,145,141,137,133,129,125,121,117,113,110,106,102,99,95,92,88,85,82,78,75,72,69,66,63,60,57,54,52,49,46,44,41,39,37,34,32,30,28,26,24,22,21,19,17,16,14,13,12,10,9,8,7,6,5,4,4,3,2,2,1,1,1,1,1,1,1,1,1,1,1,2,2,3,4,4,5,6,7,8,9,10,12,13,14,16,17,19,21,22,24,26,28,30,32,34,37,39,41,44,46,49,52,54,57,60,63,66,69,72,75,78,82,85,88,92,95,99,102,106,110,113,117,121,125,129,133,137,141,145,149,153,158,162,166,171,175,179,184,188,193,197,202,206,211,216,220,225,230,235,239,244,249,254,258,263,268,273,278,283,288,292,297,302,307,312

};
unsigned char i=0;

void InitEPwm2Example(void);
__interrupt void epwm2_isr(void);
void update_compare();

#define EPWM2_TIMER_TBPRD 624 // Period register
#define EPWM_CMP_UP 1
#define EPWM_CMP_DOWN 0

void main(void)
{
InitSysCtrl();
InitEPwm2Gpio();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();

EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.EPWM2_INT = &epwm2_isr;
EDIS; // This is needed to disable write to EALLOW protected registers

EALLOW;
CpuSysRegs.PCLKCR0.bit.TBCLKSYNC =0;
EDIS;

InitEPwm2Example();

EALLOW;
CpuSysRegs.PCLKCR0.bit.TBCLKSYNC =1;
EDIS;

IER |= M_INT3;
PieCtrlRegs.PIEIER3.bit.INTx2 = 1;

EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM

for(;;)
{

}
}

__interrupt void epwm2_isr(void)
{
// Update the CMPA and CMPB values
update_compare();
// Clear INT flag for this timer
EPwm2Regs.ETCLR.bit.INT = 1;
// Acknowledge this interrupt to receive more interrupts from group 3
PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
}

void InitEPwm2Example()
{
// Setup TBCLK
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up
EPwm2Regs.TBPRD = EPWM2_TIMER_TBPRD; // Set timer period
EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm2Regs.TBPHS.bit.TBPHS = 0x0000; // Phase is 0
EPwm2Regs.TBCTR = 0x0000; // Clear counter
EPwm2Regs.TBCTL.bit.HSPCLKDIV =1;// TB_DIV2; // Clock ratio to SYSCLKOUT
EPwm2Regs.TBCTL.bit.CLKDIV =1;// TB_DIV2;

// 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 = sinetable[i]; // Set compare A value
EPwm2Regs.CMPB.bit.CMPB = sinetable[i]; // Set Compare B value

// Set actions
EPwm2Regs.AQCTLA.bit.PRD = AQ_CLEAR; // Clear PWM2A on Period
EPwm2Regs.AQCTLA.bit.CAU = AQ_SET; // Set PWM2A on event A, up count

EPwm2Regs.AQCTLB.bit.PRD = AQ_CLEAR; // Clear PWM2B on Period
EPwm2Regs.AQCTLB.bit.CBU = AQ_SET; // Set PWM2B on event B, up count

// Interrupt where we will change the Compare Values
EPwm2Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Select INT on Zero event
EPwm2Regs.ETSEL.bit.INTEN = 1; // Enable INT
EPwm2Regs.ETPS.bit.INTPRD = ET_3RD; // Generate INT on 3rd event

}

void update_compare()
{
EPwm2Regs.CMPA.bit.CMPA = sinetable[++i]; // Set compare A value
EPwm2Regs.CMPB.bit.CMPB = sinetable[++i]; // Set Compare B value
if(i>=400) i=0;
}

可否能分享一下代码呢？我的意思就是我产生的的SPWM波形会产生在明明不该出现满占空比的地方出现满占空比，而且确实不是正弦表的问题.....

我把波形出错的地方标记出来了：

三张图是依次放大的。我被这个问题困扰很久了，很希望能有人帮忙被解决下......

你的计数模式配置有问题，一般SPWM都是增减计数，你没有设置，那默认是单增，周期应该Period寄存器值-1,所以在623时就会满值。你设置一下增减计数，然后改一下以下地方

void InitEPwm2Example()
{
// Setup TBCLK
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up
EPwm2Regs.TBPRD = EPWM2_TIMER_TBPRD; // Set timer period
EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm2Regs.TBPHS.bit.TBPHS = 0x0000; // Phase is 0
EPwm2Regs.TBCTR = 0x0000; // Clear counter
EPwm2Regs.TBCTL.bit.HSPCLKDIV =1;// TB_DIV2; // Clock ratio to SYSCLKOUT
EPwm2Regs.TBCTL.bit.CLKDIV =1;// TB_DIV2;

// 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 = sinetable[i]; // Set compare A value
EPwm2Regs.CMPB.bit.CMPB = sinetable[i]; // Set Compare B value

// Set actions
EPwm2Regs.AQCTLA.bit.CAD= AQ_CLEAR; // Clear PWM2A on Period
EPwm2Regs.AQCTLA.bit.CAU = AQ_SET; // Set PWM2A on event A, up count

EPwm2Regs.AQCTLB.bit.CBD= AQ_CLEAR; // Clear PWM2B on Period
EPwm2Regs.AQCTLB.bit.CBU = AQ_SET; // Set PWM2B on event B, up count

// Interrupt where we will change the Compare Values
EPwm2Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Select INT on Zero event
EPwm2Regs.ETSEL.bit.INTEN = 1; // Enable INT
EPwm2Regs.ETPS.bit.INTPRD = ET_3RD; // Generate INT on 3rd event

}

另外你可以不用CMPB，直接用CMAP然后输出到死区直接反向就可以了。

更正一下，刚刚红色的地方，CAD和CAU的set 和clear还要反一下，

谢谢你啊~~但是我照着你说的修改之后还是有这个问题，不过因为是增减计数，现在周期性出现错误满占空比的情况变成了出现50%占空比，如图：

如果可以的话还是请发一份您写的SPWM程序吧....多谢了！

你的周期值是不是改成原来的一倍了？按照你原来的CMPA值，肯定会有最中间的几个周期是满占空比的。因为如果是单增模式，

TPWM = (TBPRD + 1) x TTBCLK

如果是增减模式：TPWM = 2 x TBPRD x TTBCLK，所以你只要改成增减模式就可以。

可以先固定CMPA=623看一下是不是满占空比

 囧 先生您好，今天我调试，带软启动的电压闭环程序，为什么这样写程序不能实现，在按下开关后软启动程序先起作用，然后在开始PI运算的功能呢？麻烦您帮我看一下哪地方写的不合适？

Uint16 Voltage1[10];
Uint16 Voltage2[10];
Uint16 ConversionCount;
Uint16 count;//用以表示EPWM1INT中断开始工作
Uint32 ss_count;
Uint16 ss_flag;

_iq U_Kp=_IQ(1),U_Ki=_IQ(0); //Ki=12000*Tsample Ki乘以采样周期定标
_iq Ue0=0,Ue1=0,Ue2=0,Uref=0,Up=0,Ui=0,Uo0=0,Uo1=0,Uo2=0,Ureal=0;
long U1,I1;
long CA,CB;
long temp1,temp2;
int U_Ref= 265 ;

void Init_Gpio(void) //初始化GPIO

{
EALLOW;
GpioCtrlRegs.GPAMUX1.bit.GPIO4=1; //设置GPIO4口为EPWM3A波形输出引脚
GpioCtrlRegs.GPADIR.bit.GPIO4=1; //设置GPIO4口方向为输出
GpioCtrlRegs.GPAMUX1.bit.GPIO5=1; //设置GPIO5口为EPWM3B波形输出引脚
GpioCtrlRegs.GPADIR.bit.GPIO5=1; //设置GPIO5口方向为输出

GpioCtrlRegs.GPAMUX1.bit.GPIO10=01; //设置GPIO10口为EPWM6A波形输出引脚
GpioCtrlRegs.GPADIR.bit.GPIO10=1; //设置GPIO10口方向为输出
GpioCtrlRegs.GPAMUX1.bit.GPIO11=01; //设置GPIO11口为EPWM6B波形输出引脚
GpioCtrlRegs.GPADIR.bit.GPIO11=1; //设置GPIO11口方向为输出

GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 0; // 0:GPIO 1:Peripheral
GpioCtrlRegs.GPADIR.bit.GPIO17 = 1; // 0:Input 1:Output

GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 0; // 0:GPIO 1:Peripheral
GpioCtrlRegs.GPADIR.bit.GPIO18 = 1; // 0:Input 1:Output

GpioCtrlRegs.GPBMUX1.bit.GPIO34 = 0; // 0:GPIO 1:Peripheral
GpioCtrlRegs.GPBDIR.bit.GPIO34 = 0; // 0:Input 1:Output
GpioCtrlRegs.GPBCTRL.bit.QUALPRD0 = 1;//两个机器周期检测一次
GpioCtrlRegs.GPBQSEL1.bit.GPIO34 = 2; //使用6次采样鉴定
GpioCtrlRegs.GPAPUD.all = 0x0000; //上拉
EDIS;
}
/*
void GPIO0()
{
EALLOW;
GpioCtrlRegs.GPAPUD.bit.GPIO0 = 0; // Enable pullup on GPIO3（上拉电阻是做什么的？一般情况下都是会设置成使用上拉电阻模式）
GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 0; // GPIO0 = GPIO0
GpioCtrlRegs.GPADIR.bit.GPIO0 = 1; // GPIO0 = output
EDIS;
}

void Init_Adc(void) //初始化ADC模块
{
EALLOW;
AdcRegs.ADCCTL1.bit.ADCBGPWD = 1; // Power ADC BG ADCCTL1的位6 带隙上电
AdcRegs.ADCCTL1.bit.ADCREFPWD = 1; // Power reference ADCCTL1的位5 参考上电
AdcRegs.ADCCTL1.bit.ADCPWDN = 1; // Power ADC ADCCTL1的位7 Power up rest of ADC除带隙和参考上电以外的上电
AdcRegs.ADCCTL1.bit.ADCENABLE = 1; // Enable ADC ADCCTL1的位14
AdcRegs.ADCCTL1.bit.ADCREFSEL = 0; // Select interal BG 建议使用内部基准 内部基准一般就是指3.3v （ Digital Value = 4096 [(Input – VREFLO)/3.3v] when 0v < Input < 3.3v）


DELAY_US(ADC_usDELAY);

//选择序列采样模式
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN0=0; //SOC0和SOC1
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN2=0; //SOC2和SOC3
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN4=0; //SOC4和SOC5
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN6=0; //SOC6和SOC7

AdcRegs.ADCSOC7CTL.bit.CHSEL = 7; //set SOC7 channel select to ADCINA7 SOC1选择ADCINA1通道 A1通道采U1 SOC1的结果存于ADCRETSULT1寄存器中

AdcRegs.ADCSOC7CTL.bit.TRIGSEL = 9; // SOC7的触发源选择EPWM3A

AdcRegs.ADCSOC7CTL.bit.ACQPS = 6; //set SOC7 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1) SOC1的采样窗口为7个周期长度

EDIS;
// Assumes ePWM1 clock is already enabled in InitSysCtrl();
EPwm3Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group 使能ADC开始转换A（EPEMxSOCA）脉冲
EPwm3Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount 使能事件，当定时器递增时时间基准计数器等于CMPA
EPwm3Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event 在第一个件上生成ePWMxSOCA脉冲：ETPS[SOCACNT]=0，1

}

void Init_EPwm3(void)
{
// Initialization Timer
EPwm3Regs.TBPRD = 300; // Period = 2*300 TBCLK counts
EPwm3Regs.TBPHS. half.TBPHS= 0; // Set Phase register to zero
EPwm3Regs.TBCTR = 0; // clear TB counter
EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Symmetric
EPwm3Regs.TBCTL.bit.PHSEN = TB_ENABLE; // Phase loading disabled
EPwm3Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm3Regs.TBCTL.bit.SYNCOSEL = 00;
EPwm3Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // TBCLK = SYSCLKOUT
EPwm3Regs.TBCTL.bit.CLKDIV = TB_DIV1;
EPwm3Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm3Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm3Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR = Zero
EPwm3Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR = Zero
EPwm3Regs.AQCTLA.bit.ZRO = AQ_SET; // set actions for EPWM1A
EPwm3Regs.AQCTLA.bit.PRD = AQ_CLEAR; //S1
EPwm3Regs.AQCTLB.bit.ZRO = AQ_CLEAR;
EPwm3Regs.AQCTLB.bit.PRD = AQ_SET; //S2
//
//Run Time
// = = = = = = = = = = = = = = = = = = = = = = = =
// EPwm1Regs.CMPA.half.CMPA = 360; // adjust duty for output EPWM1A
// EPwm1Regs.CMPB=75; // adjust duty for output EPWM1B 移向45度
EPwm3Regs.DBCTL.bit.OUT_MODE=DB_FULL_ENABLE; //11
EPwm3Regs.DBCTL.bit.POLSEL=DB_ACTV_HIC; //10
EPwm3Regs.DBCTL.bit.IN_MODE=00; //选Epwm1A为下降沿和上升沿延迟输入源
EPwm3Regs.DBRED=30; //上升沿延迟时间
EPwm3Regs.DBFED=30; //下降沿延迟时间

EPwm3Regs.TZSEL.bit.OSHT1=1;
EPwm3Regs.TZCTL.bit.TZA=TZ_FORCE_LO;
EPwm3Regs.TZCTL.bit.TZB=TZ_FORCE_LO;

//产生EPWM3INT3中断
EPwm3Regs.ETSEL.bit.INTSEL=ET_CTR_ZERO; //当时基计数器等于0时产生EPWM3INT1中断
EPwm3Regs.ETPS.bit.INTPRD =ET_3RD; //在第3个事件时产生中断
EPwm3Regs.ETSEL.bit.INTEN=1; //EPWM1 INT中断使能

}
void Init_EPwm6(void) //初始化EPWM2 开关管S3，S4
{
// Initialization Timer
EPwm6Regs.TBPRD = 300; // Period = 2*300 TBCLK counts
EPwm6Regs.TBPHS. half.TBPHS= 0; // Set Phase register to zero
EPwm6Regs.TBCTR = 0; // clear TB counter
EPwm6Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Symmetric
EPwm6Regs.TBCTL.bit.PHSEN = TB_ENABLE; // Phase loading disabled
EPwm6Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm6Regs.TBCTL.bit.SYNCOSEL = 00;
EPwm6Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // TBCLK = SYSCLKOUT
EPwm6Regs.TBCTL.bit.CLKDIV = TB_DIV1;
EPwm6Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm6Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm6Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR = Zero
EPwm6Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR = Zero
EPwm6Regs.AQCTLA.bit.CAU = AQ_SET; // set actions for EPWM3A
EPwm6Regs.AQCTLA.bit.CBD = AQ_CLEAR; //S5
EPwm6Regs.AQCTLB.bit.CAU = AQ_CLEAR;
EPwm6Regs.AQCTLB.bit.CBD = AQ_SET; //S6
//
//Run Time
// = = = = = = = = = = = = = = = = = = = = = = = =
//EPwm6Regs.CMPA.half.CMPA =0;
//EPwm6Regs.CMPB=0;

EPwm6Regs.DBCTL.bit.OUT_MODE=DB_FULL_ENABLE; //11
EPwm6Regs.DBCTL.bit.POLSEL=DB_ACTV_HIC; //10
EPwm6Regs.DBCTL.bit.IN_MODE=0; //选Epwm2A为下降沿和上升沿延迟输入源
EPwm6Regs.DBRED=30; //上升沿延迟时间
EPwm6Regs.DBFED=30; //下降延迟时间

EPwm6Regs.TZSEL.bit.OSHT1=1;
EPwm6Regs.TZCTL.bit.TZA=TZ_FORCE_LO;
EPwm6Regs.TZCTL.bit.TZB=TZ_FORCE_LO;

}

void delay()
{
Uint16 i=0, j=0;
for(i=0; i<1000; i++)
for(j=0; j<10; j++);
}

void main(void)
{

InitSysCtrl();
Init_Gpio();
// For this case just init GPIO pins for ePWM1, ePWM2, and TZ1 pins

DINT;
InitPieCtrl(); // 初始化 PIE 控制寄存器
IER = 0x0000; // 禁止 CPU 中断
IFR = 0x0000; //清除 CPU 中断标志
InitPieVectTable(); // 初始化 中断向量表

EALLOW;
PieVectTable.EPWM3_INT = &epwm3_isr;//&表示取地址，此句表示设置EPWM3_INT中断服务程序的入口地址为epwm1_isr

EDIS;
IER |= M_INT3;
// Enable EPWM INT1 in the PIE: Group 3 interrupt 1，且使能group 1 interrupt 1
PieCtrlRegs.PIEIER3.bit.INTx3 = 1;
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM

EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;//停止每个已使能EPWM模块内的时基时钟（TBCLK）（默认状态）。

EDIS; //但是，如果PCLKCR1寄存器的EPWM时钟使能位被置位，那么EPWM模块仍然由SYSCLKOUT来计时，即使TBCLKSYNC为0。

delay();
Init_Adc(); // For this example, init the ADC
Init_EPwm3();
Init_EPwm6();

EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;//所有已使能的EPWM模块的时钟在已校准的TBCLK的第一个上升沿启动。为了得到完美同
//步的TBCLK，每个EPWM模块的TBCLK寄存器中的预分频器位必须设置相同。使能EPWM时钟的正确过程如下所示：在PCLKCR1寄存器中
//使能EPWM模块时钟；将TBCLKSYNC设置为0；配置预分频器值和EPWM模式；将TBCLKSYNC设置为1。
EDIS;

Restart_Begining:

GpioDataRegs.GPADAT.bit.GPIO17 = 0;
DELAY_US(10L);
GpioDataRegs.GPADAT.bit.GPIO18 = 0;

CA=0,CB=0;
count=0;
temp1=0;
temp2=0;
ss_count=0;
ss_flag=0;
EPwm6Regs.CMPA.half.CMPA =0;
EPwm6Regs.CMPB=0;
EALLOW;
EPwm6Regs.TZFRC.bit.OST = 1;
EPwm3Regs.TZFRC.bit.OST = 1;
EDIS;

//检测开关是否闭合，开始软启动
while(1)
{
if(GpioDataRegs.GPBDAT.bit.GPIO34 == 0)
{
delay();
if(GpioDataRegs.GPBDAT.bit.GPIO34 == 0) break;
}
}
ss_flag = 1;

EALLOW;
EPwm3Regs.TZCLR.bit.OST = 1;
EPwm6Regs.TZCLR.bit.OST = 1;
EDIS;

// Step 7. IDLE loop. Just sit and loop forever (optional):
for(;;)
{
if(GpioDataRegs.GPBDAT.bit.GPIO34 == 1)
{
delay();
if(GpioDataRegs.GPBDAT.bit.GPIO34 == 1)
goto Restart_Begining;
}

}

}

interrupt void epwm3_isr(void)
{

if(ss_flag == 1)
{
if(ss_count<=307200)
{
ss_count++;
temp1=(long)((ss_count)>>11);

EPwm6Regs.CMPA.half.CMPA =300-temp1;
EPwm6Regs.CMPB=temp1;

}
}

U1= AdcResult.ADCRESULT7; //U1电压, A7通道采U1
Voltage1[ConversionCount] = AdcResult.ADCRESULT7; //ADC的最近10次采样结果放在Voltage1数组中

// If 10 conversions have been logged, start over
if(ConversionCount == 9)
{
ConversionCount = 0;

}
else //AD采样值是经过10次求平均得到的

{
ConversionCount++;
}

//pi程序
Ureal=_IQ(U1);

Uref=_IQ(U_Ref); //300缩放为2.3，对应数字量为2855

Ue1=Uref-Ureal ;

Ue2=Ue1-Ue0; //两者的误差

Up=_IQmpy(U_Kp,Ue2);

Ui=_IQmpy(U_Ki,Ue1);

Uo1=Uo0+Up+Ui;

Ue0=Ue1;

Uo0=Uo1;

if(Uo1>=_IQ(EPwm3Regs.TBPRD*0.9)) Uo1 =_IQ(EPwm3Regs.TBPRD*0.9); // PI 输出上限幅

if(Uo1<=_IQ(1)) Uo1 =_IQ(1); // PI 输出下限幅

temp2=(long)((Uo1)>>18); //调制波得到数据

if ( temp2>=270) { temp2=270; EPwm6Regs.CMPA.half.CMPA = temp2; EPwm6Regs.CMPB=300-temp2; }
else if ( temp2<=0) { temp2=1; EPwm6Regs.CMPA.half.CMPA = temp2; EPwm6Regs.CMPB=300-temp2; } //设置移向角范围为0.6度到90

CA=temp2;
CB=300-temp2;
EPwm6Regs.CMPA.half.CMPA =CA; //移向角
EPwm6Regs.CMPB=CB;

// I1= AdcResult.ADCRESULT0; //I1电压, A0通道采I1

count++;
GpioDataRegs.GPATOGGLE.bit.GPIO0=1;
/*

*/
GpioDataRegs.GPATOGGLE.bit.GPIO0=0;
EPwm3Regs.ETCLR.bit.INT = 1; //清除EPWM1 INT的中断标志位
PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;

}

对，改成增减模式后，只是把TBPRD改成了625，周期指确实相当于变成原来的一倍了，但是我出现满占空比的地方不是在那几个623的地方，二是在其他地方，正如图中一样，经查表，该是623的地方就是623，但是不该是623的地方也出现了满占空（增模式）或50%占空（增减模式）的情况，而不是对应出现正弦表中数值对应的占空比。其实如果能有2837x 的SPWM源程序供我参考研究下就最好了....

你可以参考下以下例程，是一个单项DC/AC的功能。不是用查表法，是用TMU算的

C:\TI\controlSUITE\development_kits\HV_1PH_DCAC

谢谢啊，不过自己已经习惯查表法了，控制起来熟悉些，请问有查表法的例程吗？

f2837x的TMU很强大，速度不比查表的慢。所以没有查表法来做DC/AC的例程

嗯嗯....我知道确实很厉害......但是现在还不太懂TMU，而且对查表法比较熟悉，调频调压也方便些....如果可以的话还是想请求一份查表法的例程.....谢谢啦