TL494推挽做DC-DC,输出滤波电解发热严重 有图
小弟刚做了一个DC-DC降压电源输入20~36DC输出5V20A.现在是输滤波电解C13发热严重,随着负载的变大而发热!!!还请各位前辈帮忙看看哪个地方出错了!发热问题已解决,现在是在30V以上时开关管很烫电流增大 3313651254098946.pdf
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@18790300
滤波电感,你的驱动波形发上来看看,电路图还是原来那个吗?
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/81/3313651254217011.jpg');}" onmousewheel="return imgzoom(this);">31V D极的波形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/81/3313651254217025.jpg');}" onmousewheel="return imgzoom(this);">28V D极的波形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/81/3313651254217042.jpg');}" onmousewheel="return imgzoom(this);">28V时494输出的波形
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@kelingdianzi
[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/81/3313651254217011.jpg');}"onmousewheel="returnimgzoom(this);">31VD极的波形[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/81/3313651254217025.jpg');}"onmousewheel="returnimgzoom(this);">28VD极的波形[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/81/3313651254217042.jpg');}"onmousewheel="returnimgzoom(this);">28V时494输出的波形
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/81/3313651254218672.jpg');}" onmousewheel="return imgzoom(this);">DC输出波形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/81/3313651254218683.jpg');}" onmousewheel="return imgzoom(this);">DC输出波形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/81/3313651254218695.jpg');}" onmousewheel="return imgzoom(this);">整流输出波形 手机拍的不是很清楚
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@kelingdianzi
[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/81/3313651254218672.jpg');}"onmousewheel="returnimgzoom(this);">DC输出波形[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/81/3313651254218683.jpg');}"onmousewheel="returnimgzoom(this);">DC输出波形[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/81/3313651254218695.jpg');}"onmousewheel="returnimgzoom(this);">整流输出波形 手机拍的不是很清楚
电感后加105电容(瓷的) 解决纹波 MOS管耐压多少??
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