上電就保護,什么原因?
我用3842做了一個反激式電源,輸入電壓32V,多路輸出+15V,軟啟動電阻5.1K,電容47u,采樣電阻0.33毆.現象是,上電沒有輸出,調小反饋電阻就會有輸出了,然后再把反饋調大,電源可以正常工作.這是什么原因?大俠們請指教!
上電就保護,什么原因?
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@董萬華
是簡易穩壓:加反饋繞組!!
還是把圖貼上來吧!
諾亞方舟說的假反饋怎么解?大家給看看我得這個電源
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諾亞方舟說的假反饋怎么解?大家給看看我得這個電源
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';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
還是把圖貼上來吧!諾亞方舟說的假反饋怎么解?大家給看看我得這個電源[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';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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