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/49/1169132945.gif');}" onmousewheel="return imgzoom(this);">
震荡部分和6脚输出部分如上 图,请教大家怎么解决啊!
输入DC65V
磁芯EE25
输出5V 10V 15V
NP 15 ;NS 3-3-3
想总输出25W左右
还有就是开关管关断时间比较长有300nS开关管很烫:
3843反激出现 如下波型、怎么解决?
全部回复(9)
正序查看
倒序查看
现在还没有回复呢,说说你的想法
@蓝黑
電源圖呢?PCB圖呢
谢谢您的回复!
不好意思今天公司的电脑坏了、硬盘里面数据全没了、````````````````````
电路图也没了!
今天将磁芯磨了一下驱动的波形好了点但是下将沿有点震荡、
震荡部分的波形没有变!
变压器的波形现在是这样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/49/1169203994.gif');}" onmousewheel="return imgzoom(this);">
不好意思今天公司的电脑坏了、硬盘里面数据全没了、````````````````````
电路图也没了!
今天将磁芯磨了一下驱动的波形好了点但是下将沿有点震荡、
震荡部分的波形没有变!
变压器的波形现在是这样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/49/1169203994.gif');}" onmousewheel="return imgzoom(this);">
0
回复
提示
@李绍波
把3843设定为50K..变压器用EE25,,,电感量为75uH,,匝比为45:5:5:5
Can try Below:
1. Frequency = 100K
2. Np=25T, Ns=3T
3. air gap=0.17mm Lp=362uH
At Vin=65Vdc
Ip=1.5A
Bac=130mT, Bdc= 148mT Total B=278mT <300mT
Duty=39.1%
MosFet voltage =107V need to check the peak voltage caused by leakage inductance.
reverse voltage on output diode of 5V = 12.8V, can use 45V schottky.
4. Core I used for calculation is EE25/13/11 Ae=78.4, le=57.5mm
1. Frequency = 100K
2. Np=25T, Ns=3T
3. air gap=0.17mm Lp=362uH
At Vin=65Vdc
Ip=1.5A
Bac=130mT, Bdc= 148mT Total B=278mT <300mT
Duty=39.1%
MosFet voltage =107V need to check the peak voltage caused by leakage inductance.
reverse voltage on output diode of 5V = 12.8V, can use 45V schottky.
4. Core I used for calculation is EE25/13/11 Ae=78.4, le=57.5mm
0
回复
提示