lossless snubber of forward converter

[dcj50105]

lossless snubber

hello! everyone
who can provide a lossless snubber of the forward converter,which can snub the spike of the mosfet when the mosfet is on/off.
TKS

 

[E-design]

lossless turn-off snubber

There are various designs on this, some complicated. The basic one is similar to a RCD snubber but with the R replaced by a series L and D combination returning to ground instead of supply. Look at the pdf file

The energy that is stored in the capacitor during turn-off is transferred later to the L as stored current. When the device turns on again the LC combination will cause a damped oscillation with freq=1/2*pi(sqrtLC) and the energy will be returned to the supply bus via the diodes.

Choose C large enough to slow the voltage on the device as for RCD type. Then choose L so that the one period of the oscillation is less than the device on-time

 

[dcj50105]

forward converter snubber

Thanks Full Member level 4 for your replying!
can you provide the pdf file you said? I appreciate it if you tell me the deails!

 

[E-design]

design lossless snubber

Just click on the "Download" in my previous post

 

[prentemp]

forward snubber

if you work in high frenquency,you can make the oscillation bigger than mosfet on time,but the snubber inductor need a resistor snubber.
i think

 

[dcj50105]

lc snubber forward

hello! everyone
I really need have some data about this aspects in detail,who can provide it ? please e-mail to me as much as possible, I'll apreicate your help!
Thanks everyone for your help!