l***g
发帖数: 1035 | 1 most literatures give data that do not show much improvement on power effici
ency. any one can comment the realistic usage of such technique? is it worth
the extra effort to improve effiency and reduce emi by sw? which type may b
e the best choice? | g******u
发帖数: 3060 | 2 在高功率电路里，当然要用，比如LLC.甚至于还要lossless snubber,当然，我见识浅
陋。。。
在一般功率里（比如低于200瓦），可以选那种transition mode chip，类似ST的L6565
之类，这种芯片工作模式就是几乎无turn on loss,turn-off loss也可以通过很简单的
snubber来减小。所以不用很复杂就可以做到很接近的soft switching.某些杂志上有些
苦心写出来的所谓ZVZCS的电路，我相当怀疑工业界有这种8到12个resonant模式的东西。
效率是提高不了多少的，我上次花了近3周，才把一个65W的效率提高了2％。但是
heatsink毕竟小一点是一点。有个老头说，你加snubber,soft switching之类做到极点
，还不如一个layout画得好。 | g*****g
发帖数: 3623 | 3 LLC, SR + very good magnetic material..
full bridge without SR, we made 92%.with SR and LLC, buy another 2-3%
effici
worth
b
【在 l***g 的大作中提到】
: most literatures give data that do not show much improvement on power effici
: ency. any one can comment the realistic usage of such technique? is it worth
: the extra effort to improve effiency and reduce emi by sw? which type may b
: e the best choice?
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