On Sep 9, 7:50 pm, Grumpy The Mule wrote:
Ok, this should work. http://tinyurl.com/6at4zu

I mean the primary of this thing uses litz wire that looks like 10AWG
wire about 13 turns around the core
and they using 4 strands of 28 AWG to run the filament
The HV secondary measures only 6.8 ohms DC.

I'm glad you mentioned that. If the core is ferrite and it's gapped,
then the litz makes sense to reduce eddy current losses from the
fringing field sprayed out of the gap. A gapped core would also most
likely mean it is a flyback.

It really is amazing the power density SMPS can achieve. Though the
overload capacity available from big hunks of iron and copper isn't
to be discounted lightly. I had to pick up a 10KW autotransformer
today. I don't know how much it weighed but I'd guess 130lbs, or
there about. The two transformers in the 10KW SMPS are maybe four
pounds total.

Hey mule

Exactly right it is a gapped core. Once I git's a scope on I'll see.

But the voltage doubler they using is full wave doubler. Which means
they taking the positive and negative waves to get 4000 or so volts
DC
Now the positive half they use a .0082 mfd for a filter and the
negative half they use a .0056 mfd filter both at 3000wvdc.
..
They use a damper diode that looks like a varistor, and a hold down
cap is .032 mfd at 500V across the primary.
The power into the primary is filter by an LC just to prevent the RF
getting back into the mains/bridge diodes pack.

73 OM

n8zu