沒人來,自己先頂一下.另外有沒有高手收徒弟啊,非常感激

這個話題就有點廣喔..
  很多公司有他們自己的電路,再修修改改,就可以達到相當之問題..當然效率的指標也就不在話下..
  如要我來弄的話,我會先假設一個目標效率(不能低於客戶),在每塊去分配.比如說PFC為90%,主電路(forward):85%等等...

Dear LZ, efficiency = Input power / output power, so only measurement can make sure your efficiency! For next question? I say "efficiency is only small factor for circuit selection!!".

I think I am uncertain, choice of circuit determine working way their just, but decision of efficiency is it lean against their design means and quality of the part determine to a great extent to have

那效率怎么說呢?難道跟說選的線路沒什么關系嗎?

In gemerally knowledge, Flyback has highest efficiency in high-voltage/10W level. Forward has highest effiecncy in low voltage/100W level. Half-Bridge is best for high-voltage/ 100Wlevel. Full-Bridge is best choice for Kilo-Watts! So the other key factors are more important, such as MTBF, Size, and personal ability!

Yes, I agree to”temp1234 “statement.. Every kind of circuit wants its pluses and minuses. Their power limits the range too.
Unless but it is the real the important, it can only consult..

why  half-Bridge is best for high-voltage/ 100Wlevel
is it very diffent from full-bridge in low powe rang

Half-bridge and full-bridge本來就是高效率轉(zhuǎn)換場合會經(jīng)常用到啊!
  其它地方很少!!!

IN two-ends topologies, the output stage needs only half withstand-voltage of the signle-end topologies! And for 100Ws, the FB is a little bit too complex! So it is depends, you know one topology better then it will dominate more, and your ability is higher then the power-range will extend more!!