输出正弦波变形了。。

三番修改终于把电路修改的差不了，可是最后输出的波形却不理想。竟然发生断裂，这是为什么呢？？请给位大侠帮帮忙啊。。
这里把图贴上

全部回复(26)

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宛东骄子

2011-08-12 12:48

程序有错

gzcheng123

LV.2

2011-08-12 15:12

@宛东骄子

程序有错

恩，是的，原来是路SPWM和IO脚经过一个与非门得到两路信号，今天把程序改成直接由ARM输出两路SPWM，（中间有个光耦）得到的波形是只有一个断点了？而且载波由10k变成20k的话，又会出现两个断点，5k也会出现两个断点。。这又会是为什么呢？能不能再指点下

wanhuachao

LV.3

2011-08-12 15:18

@gzcheng123

pwm计算检查，比如正弦表啊、角度啊是否正常等等

gzcheng123

LV.2

2011-08-12 15:29

@wanhuachao

pwm计算检查，比如正弦表啊、角度啊是否正常等等

检查了，两路输出的是一个正弦表，如下

0.010 ,0.025 ,0.040 ,0.055 ,0.070 ,0.085 ,0.100 ,0.115 ,0.130 ,0.145 ,

0.160 ,0.175 ,0.190 ,0.205 ,0.220 ,0.235 ,0.250 ,0.260 ,0.275 ,0.285 ,

0.300 ,0.315 ,0.325 ,0.335 ,0.350 ,0.360 ,0.370 ,0.380 ,0.390 ,0.400 ,

0.410 ,0.420 ,0.425 ,0.435 ,0.440 ,0.450 ,0.455 ,0.460 ,0.470 ,0.475 ,

0.480 ,0.480 ,0.485 ,0.490 ,0.495 ,0.495 ,0.495 ,0.500 ,0.500 ,0.500 ,

0.500 ,0.500 ,0.500 ,0.495 ,0.495 ,0.495 ,0.490 ,0.485 ,0.480 ,0.480 ,

0.475 ,0.470 ,0.460 ,0.455 ,0.450 ,0.440 ,0.435 ,0.425 ,0.420 ,0.410 ,

0.400 ,0.390 ,0.380 ,0.370 ,0.360 ,0.350 ,0.335 ,0.325 ,0.315 ,0.300 ,

0.285 ,0.275 ,0.260 ,0.250 ,0.235 ,0.220 ,0.205 ,0.190 ,0.175 ,0.160 ,

0.145 ,0.130 ,0.115 ,0.100 ,0.085 ,0.070 ,0.055 ,0.040 ,0.025 ,0.010
共100个（在程序中充当占空比的角色），不过我是在两个桥臂交替的时候程序如下

if(spwm_change)

{

TMR32B1MR0 = TMR32B1MR3*a[i_timer32b1];//打开第一路SPWM

TMR32B1MR1 = 0; //第二路SPWM的占空比值0（关掉第二路SPWM）

}

else
{

TMR32B1MR0 = 0;//第一路的SPWM关

TMR32B1MR1 = TMR32B1MR3*a[i_timer32b1]; //打开第二路SPWM

}

wanhuachao

LV.3

2011-08-12 16:32

@gzcheng123

检查了，两路输出的是一个正弦表，如下0.010,0.025,0.040,0.055,0.070,0.085,0.100,0.115,0.130,0.145,0.160,0.175,0.190,0.205,0.220,0.235,0.250,0.260,0.275,0.285,0.300,0.315,0.325,0.335,0.350,0.360,0.370,0.380,0.390,0.400,0.410,0.420,0.425,0.435,0.440,0.450,0.455,0.460,0.470,0.475,0.480,0.480,0.485,0.490,0.495,0.495,0.495,0.500,0.500,0.500,0.500,0.500,0.500,0.495,0.495,0.495,0.490,0.485,0.480,0.480,0.475,0.470,0.460,0.455,0.450,0.440,0.435,0.425,0.420,0.410,0.400,0.390,0.380,0.370,0.360,0.350,0.335,0.325,0.315,0.300,0.285,0.275,0.260,0.250,0.235,0.220,0.205,0.190,0.175,0.160,0.145,0.130,0.115,0.100,0.085,0.070,0.055,0.040,0.025,0.010 共100个（在程序中充当占空比的角色），不过我是在两个桥臂交替的时候程序如下if(spwm_change){TMR32B1MR0=TMR32B1MR3*a[i_timer32b1];//打开第一路SPWMTMR32B1MR1 =0;//第二路SPWM的占空比值0（关掉第二路SPWM）}else{TMR32B1MR0 =0;//第一路的SPWM关 TMR32B1MR1 =TMR32B1MR3*a[i_timer32b1];//打开第二路SPWM}

i_timer32b1也查了么