15w做软开关采用什么拓扑结构好

电源要求
功率15w
输入18-36dc
输出12vdc
由于对效率要求90%,所以要做软开关,同时也体积也要做到1/8砖大小
目前做了有源钳位正激,由于两个开关管加上输出滤波电感实在太占地方,所以想改变方案
请问采用什么拓扑结构比较好?效率高还省地方,最好附上芯片,谢谢拉

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feifreezhao

LV.1

2008-03-06 22:44

要做隔离的,高手请指导啊

temp1234

LV.5

2008-03-07 12:57

@feifreezhao

要做隔离的,高手请指导啊

For your reference:it is is a flyback module
TYCO's CPKW002A0C1Z module:36-75V input 1/16 brick 15V/2A, 30W.
Finetune it can meet your requirements!

LV.1

2008-03-10 10:08

做啥软开关啊,直接做就好了...优化下磁

temp1234

LV.5

2008-03-11 10:44

做啥软开关啊,直接做就好了...优化下磁

15W is hard to make 90% via hard switch, so try enlarge the transformer as possible, then low down the frequency as low as possible, then you may need add more cap. to make stable feedback! Try harder, good luck!!

Thanks!

LV.1

2008-03-14 10:40

@temp1234

15Wishardtomake90%viahardswitch,sotryenlargethetransformeraspossible,thenlowdownthefrequencyaslowaspossible,thenyoumayneedaddmorecap.tomakestablefeedback!Tryharder,goodluck!!Thanks!

Yeap,I think it's hard to get it with forward converter
But with DCM SR flyback,it may be a good choice