Electronics > Projects, Designs, and Technical Stuff
SMPS for vacuum tube power amplifiers.(status: back at it)
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T3sl4co1l:
That transformer looks alright, 2.7uH is pretty typical and should be easy to snub.

Look up SMPS circuits, you'll see how the snubber is wired.  Typical values would be something like, UF4007, 10nF and 22kΩ.

Tim
SK_Caterpilar_SK:
Also what are my options using a zenner clamp snubber? What re the drawbacks? Can I combine zenner clamping with the "traditional" way of snubbing? Is there even a point of doing that?
T3sl4co1l:
RCD clamp snubber and zener clamp snubber are about as good.  They are both better than RC damper, because the peak voltage is limited more rigidly.

RCD rate (dV/dt) snubber is acceptable, and can provide reduced turn-off losses (in the transistor at least; with optimal values, the overall losses can actually be reduced slightly), and can be dimensioned to dampen the ringdown waveform (in DCM), but doesn't provide as good clamping.

The only differences between RCD rate and peak snubbers is the RC time constant, and where the resistor is connected: in the rate snubber, the resistor is in parallel with the diode, and the RC time constant is small (a fraction of a cycle).

Tim
SK_Caterpilar_SK:
So what would be the possibly best all arround solution. With the values you suggest and if possible a simplified schematic too.. Because at this point I have seen soo many variations that I have no idea which one is the correct one to use in my speciffic case.
MagicSmoker:

--- Quote from: SK_Caterpilar_SK on September 18, 2019, 08:07:15 pm ---So what would be the possibly best all arround solution. With the values you suggest and if possible a simplified schematic too.. Because at this point I have seen soo many variations that I have no idea which one is the correct one to use in my speciffic case.

--- End quote ---

What does your current design look like? Sampling a few random posts including the first one it seems that somewhere along the way this went from being a 12V input switcher of indeterminate type to an offline (aka mains-supplied) flyback.

BTW - switchers are difficult, but you are doing much better at 17 than I was. Then again, you had to request datasheets by fax when I was 17, and the internet of the time were bulletin boards reached by 300bps modems... Good times...

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