上电就保护,什么原因?
我用3842做了一个反激式电源,输入电压32V,多路输出+15V,软启动电阻5.1K,电容47u,采样电阻0.33殴.现象是,上电没有输出,调小反馈电阻就会有输出了,然后再把反馈调大,电源可以正常工作.这是什么原因?大侠们请指教!
上电就保护,什么原因?
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@董万华
是简易稳压:加反馈绕组!!
还是把图贴上来吧!
诺亚方舟说的假反馈怎么解?大家给看看我得这个电源
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诺亚方舟说的假反馈怎么解?大家给看看我得这个电源
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/0/1062159966.jpg');}" onmousewheel="return imgzoom(this);"> 0
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@hkbuaa
还是把图贴上来吧!诺亚方舟说的假反馈怎么解?大家给看看我得这个电源[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/0/1062159966.jpg');}"onmousewheel="returnimgzoom(this);">
Soft start
From the schematic, the problem should be cause by the overshoot at turn on, add a soft start circuit can solve the problem,but strongly recommend to change the feedback loop to the secondary side,you can save at least two linear regulator and save more cost.
From the schematic, the problem should be cause by the overshoot at turn on, add a soft start circuit can solve the problem,but strongly recommend to change the feedback loop to the secondary side,you can save at least two linear regulator and save more cost.
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