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/77/2952071241240133.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">菜鸟求助:3843求助,请大家帮我看看.
大家好,首先我很菜,我现在用下面这个电路图做一个5V输出的开关电源.现在的问题是我不知道磁芯的参数,用的是从一个5V4A的老开关电源上面拆下来的.磁芯引脚也是根据之前的开关电源的引脚接入我自己的这个开关电源.磁芯实际的引脚和我电路的接法可能会引起误解,说明一下.原磁芯在老电源上的接法是:磁芯8脚接地,磁芯5脚经过一个二极管接到了3843的7脚,磁芯4脚经过一些二极管接到了3843的3脚,磁芯8、5、4脚都是导通的,磁芯7脚6脚是导通的.磁芯854脚和76脚不导通;磁芯7脚接300V整流输入端,磁芯6脚接开关管D极,磁芯1脚2脚和老电源解法相同.我现在按照以下电路做出这个电源实验,调试的时候,一接电,就产生“嗞嗞”的连续的声音,请大侠们帮帮我,指点我一下,不甚感激.
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/77/2952071241240133.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/77/2952071241240133.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">全部回复(13)
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@deng52030
[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/77/2952071241241410.jpg');}"onmousewheel="returnimgzoom(this);">磁芯的引脚和我的描述对应.引脚和我上面说明的一样.请大家不要见笑,虽然是菜鸟,但我一直在很认真的做个电源.
PCB板也上传上来.
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/77/2952071241241638.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/77/2952071241241638.jpg');}" onmousewheel="return imgzoom(this);"> 0
@deng52030
PCB板也上传上来.[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/77/2952071241241638.jpg');}"onmousewheel="returnimgzoom(this);">
整个原理图,估计看不清楚
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/77/2952071241241842.gif');}" 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/77/2952071241241842.gif');}" onmousewheel="return imgzoom(this);"> 0
@deng52030
整个原理图,估计看不清楚[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/77/2952071241241842.gif');}"onmousewheel="returnimgzoom(this);">
输出部分
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/77/2952071241241926.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/77/2952071241241926.jpg');}" onmousewheel="return imgzoom(this);"> 0
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/77/2952071241241410.jpg');}" onmousewheel="return imgzoom(this);">磁芯的引脚和我的描述对应.引脚和我上面说明的一样.请大家不要见笑,虽然是菜鸟,但我一直在很认真的做个电源. 0
