PIC16F73的正弦逆变,输出的电压波形畸形

我想用PICF73为核心做的工频正弦逆变,但输出的电压波形畸形.请各位帮下手,应要怎么改动才行.


单片机的设置:PR2=195,晶振为:20M,TMR2的预分频及后分频都为 1:1.

表格为:
const char pwm_table[256]={
5,10,14,19,24,29,33,38,43,47,52,57,61,66,70,75,
79,83,88,92,96,100,104,108,112,116,120,124,127,131,134,138,
141,144,148,151,154,157,159,162,165,167,170,172,174,176,178,180,
182,184,185,187,188,189,190,191,192,193,194,194,194,195,195,195,

195,195,194,194,194,193,192,191,190,189,188,187,185,184,182,180,
178,176,174,172,170,167,165,162,159,157,154,151,148,144,141,138,
134,131,127,124,120,116,112,108,104,100,96,92,88,83,79,75,
70,66,61,57,52,47,43,38,33,29,24,19,14,10,5,0,

5,10,14,19,24,29,33,38,43,47,52,57,61,66,70,75,
79,83,88,92,96,100,104,108,112,116,120,124,127,131,134,138,
141,144,148,151,154,157,159,162,165,167,170,172,174,176,178,180,
182,184,185,187,188,189,190,191,192,193,194,194,194,195,195,195,

195,195,194,194,194,193,192,191,190,189,188,187,185,184,182,180,
178,176,174,172,170,167,165,162,159,157,154,151,148,144,141,138,
134,131,127,124,120,116,112,108,104,100,96,92,88,83,79,75,
70,66,61,57,52,47,43,38,33,29,24,19,14,10,5,0,
};

都不知我的表值是否对,特别是那些小数点,不知如何处理.

发几张波形图片啊,电路图啊,大家看看也许有办法

第四贴的图都是在载波20KHz下所取得的.已对正弦周期采样了400个量化值,但出来的电压就是变了.

你用的什么变压器,是环形的还是E型的?

如下图所示:
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我分别用了500VA,1000VA的两种变压器试过,出来的效果都一样.这两种变压用在方波来试是没问题的,出来的方波是正常的.

另外,我将一台金山特正弦逆变电源的变压器(1000VA)拆下来,装在我的电路上试过,也不行.

怎么没人帮我呀,请大家发表下呀!

把输出的滤波电容加大试试.另外空载电流是多少?

还有一点,此变压器原用作方波推挽的,我在此电路中只用了一半的线圈.

我将一台金山特正弦逆变电源的变压器(1000VA)拆下来,装在我的电路上试过,也不行.

真的是糊涂了,在带负载后,电压比空载时下了很多.

为何为何???

你在逆变桥输出端直接用RC滤波看看波形如何,可以先不接变压器.

1 测试条件:电池电压48V,
          工频500VA变压器

2 在空载的情况下,电容接在260V的端子上(该端子在方波时为260V),电压也是测此端子上的,记录如下:
          1.2u电容时,电池母线电流:0.52A,输出电压:AC252V;
          2.4u电容时,电池母线电流:0.61A,输出电压:AC248V;
          3.6u电容时,电池母线电流:0.73A,输出电压:AC246V.

3 在接100W灯泡的情况下,灯泡、电容都是接在260V的端子上(该端子在方波时为260V),电压也是测此端子上的,记录如下:
          1.2u电容时,电池母线电流:2.36A,输出电压:AC179V;
          2.4u电容时,电池母线电流:2.35A,输出电压:AC178V;
          3.6u电容时,电池母线电流:2.43A,输出电压:AC178V.

这和你前面说的“单片机RC1,RC2输出的RC滤波”波形相差太远.怎么也应大概看到点正弦.

现在才看明白了,你的单片机两路SPWM和IR2110连接不对啊!
你可以把单片机两路SPWM放在两IR2110的低输入端,同时单片机两路SPWM倒相放在两IR2110的高输入端,OK!不过还要做个死区.

单片机RC1,RC2输出的RC滤波
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SPWM波 RC1,R2C分别对地
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变压器输出电压波形(100W灯泡负载,示波器探笔已衰减为1/10,即5V表示50V)
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原理图:T为工频变压器,LP为100W灯炮,C为1.2u/400V电容.
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图画错了,现已改了过来.应为这样的:
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不知我这样测的方法是否正确:
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电容电阻的大小不同,波形不一致:
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顶起来,不要沉了,不然就没人帮我了!

你这个还是错的!按下图接吧.500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/72/700751228438027.gif');}" onmousewheel="return imgzoom(this);">

还有,2110的9脚供电也是5V.走线注意13脚和2脚分开走.13脚的地和前面的逻辑电路的地连在一起,2的地连MOS的源极.

问题会不会出在变压器那里?我看你的电压比不对.

从PWM信号波形来分析,见如下图,我的电路是没问题的,而且我以前使用过的1000W氙气灯电子镇流器的全桥输出就用我的这个接法.

这是 xzszrs 大侠的接法,去掉死区部分.
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_________________________________________________________________
这是我采用的接法.
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见第12贴,我用过从1000W逆变电源拆下来的变压器也不行.

48V输入,输出220V,380V.

我认为变压器应是没事的.我已试用了几家公司打样的变压器,效果都差不多.

试试把示波器的探头接到G2和G4的C极看看,波形应该大不一样

IR2110的输出驱动端的RC波形:
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500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/72/1627101228380192.jpg');}" onmousewheel="return imgzoom(this);">

下图为方波的程序,两个下桥臂D脚的波形:
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下图(有几幅)为SPWM波和程序,两个下桥臂D脚的波形:
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500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/72/1627101228908514.jpg');}" onmousewheel="return imgzoom(this);">
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/72/1627101228908555.jpg');}" onmousewheel="return imgzoom(this);">

波形肯定不一样啦,一个上桥臂通,另一个上桥臂不通,波形会一样吗?

请看下面的示波形的保存图.

请 xzszrs 及各位大侠高手再帮我分析下,

我23贴的图,从波形上入手的,我认为我的电路是没错的.

我认为你的问题不在变压器,也不在SPWM波,好像在驱动和桥这一部分,没有详细的图所以不好断定.比如自举二极管应该是快恢复的,图上标的是1N4007.自举电容也不要那么大,太大了对下管不好.

电路图如下,开环,只作输出,没有任何反馈.
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电路一样,我用方波的程序试是完全没问题的.
变压器220,310端均正常输出220V,310V电压(用万用表量,下同),负载100W至500W电压都相差不大


如果用SPWM程序试,220V端负载100W灯泡,测得电压只有140左右,
                  310V端负载100W灯泡,测得电压只有165左右,
且加大负载,电压还会下降.