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BUCK电路带载后驱动GS与DS都出现振荡有方法解决吗,有波形图

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/82/109541256956666.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" 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/82/109541256956679.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" 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/82/109541256956851.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
上面是主电路以及IGBT的S1:DS极波形与驱动的GS极波形,请部高手的方法解除振荡的良方(该电路在未接入220直流电源时,S1测量GS极的波形是正常(见右边图),当接入220直流电源后S1的DS与GS极都出现振荡波形(见左边图),)
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zl8864
LV.6
2
2009-10-31 16:43
散热片未接地时的电位波形: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/82/109541256978589.jpg');}" onmousewheel="return imgzoom(this);">
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zl8864
LV.6
3
2009-10-31 16:44
@zl8864
散热片未接地时的电位波形:[图片]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){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/82/109541256978589.jpg');}"onmousewheel="returnimgzoom(this);">
IGBT的GS与DS驱动波形都有振荡波形: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/82/109541256978653.jpg');}" onmousewheel="return imgzoom(this);">
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zl8864
LV.6
4
2009-10-31 16:46
@zl8864
IGBT的GS与DS驱动波形都有振荡波形:[图片]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){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/82/109541256978653.jpg');}"onmousewheel="returnimgzoom(this);">
IGBT的GS与TLP250驱动波形,但只有GS振荡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/82/109541256978783.jpg');}" onmousewheel="return imgzoom(this);">
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st.you
LV.10
5
2009-10-31 22:33
@zl8864
IGBT的GS与TLP250驱动波形,但只有GS振荡[图片]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){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/82/109541256978783.jpg');}"onmousewheel="returnimgzoom(this);">
一般都是反馈环路出了问题
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zl8864
LV.6
6
2009-10-31 23:20
@st.you
一般都是反馈环路出了问题
反馈环路未接入,在开环运行
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