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/68/1333501217819589.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);"> 1333501217819612.sch 请大家帮我看看这个问题:启动闪,后正常.
这是一款T8 2X18W的电路.绿色线是:电解上的电压.红线是下三极管上的电压.黄色是电流IC波形.如图,启动过程中,闪,后正常.参数:小磁环是PC30,2K左右磁导.4:6:4.起跳822,越小闪的更厉害,几乎启动不起来.所以用了822.但依旧如此闪,但可以启动.电感EE20 3.2MH.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/68/1333501217819589.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);"> 1333501217819612.sch
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/68/1333501217819589.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);"> 1333501217819612.sch 全部回复(47)
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先帮你贴出图来
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/68/174851217834694.jpg');}" onmousewheel="return imgzoom(this);">
36W功率用13005,2.25芯片已足够了,无须用13007,电路R11、12改用1N4007, C3由1KV/332改152,再参考经典电路做就行了.
另:“小磁环是PC30,2K左右磁导”——此表达有误,PC30磁材的磁导率为2.5K左右,并非2K左右
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/68/174851217834694.jpg');}" onmousewheel="return imgzoom(this);">
36W功率用13005,2.25芯片已足够了,无须用13007,电路R11、12改用1N4007, C3由1KV/332改152,再参考经典电路做就行了.
另:“小磁环是PC30,2K左右磁导”——此表达有误,PC30磁材的磁导率为2.5K左右,并非2K左右
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