On Sep 8, 7:13*pm, Grumpy The Mule wrote:
THESE MUST BE OPERATED UNDER LOAD OR THEY WILL SMOKE.

At least that is what happend to mine.

Jimmie

Oh, sorry to hear that. *Yeah, it's a bad idea to operate
any switch mode power supply without a minimum load unless
the min. load is built-in or the thing is so inefficent that
its own losses make up the minimum load. The output diodes
probably didn't like that... just my guess.

I found some interesting stuff on the panasonic inverter.

On the fusor chat they claim it's 85% efficient and good for
1200W. *The efficiency seems right, the 1200W seems... optimistic.

Also this, instructions on getting the inverter to play.http://www.fusor.net/board/view.php?..._hvpower&key=1...
046 *

Hey mule:
Your url got cropped.

The inverter PS I have can be fooled into thinking it has a load.

There is a current sense I found and a voltage sense
both on the primary side.
It's a piece of cake opto coupling a signal back
to those sense inputs. they are both straight voltage dividers
with Vrefs. And the current sense uses a 50K ohm trim pot for
adjustment.

They use a 100meg bleeder for a load. And the filament which is at
least
150 watts, loads the supply too.

I suspect my 120VAC inverter will work off of 240VAC

And if you take out the filament circuit that gives yoiu an extra 150
watts.
I suspect I can gits 1500 watts from my 1300 watt interer PS, with
input
filtering of the DC off the mains.

But the final report wont happen until i gits the feedback circuit
wired.
That will prevent it from trying to produce 1300 watts into no load.
With no load it will try to up the voltage to produce more current.
Which it can't
produce more current so it keeps increasing the voltage untill it lets
out the smoke,

When it hits 3000 volts I will fool the sense circuits: a voltage
divider for
the current sense and another divider for the voltage sense, into
seeing 1300 watts.

Another trick is to run the mains off a variac starting at 10 VAC very
slow. Also supply seperate power to the PWM IC circuit,
Just to see how far it will go, and not get it to go into run away.

I see the power trouble how can you gits 1300 watts out of that little
bitty core?
That's what they used to say about silicone diodes when they used to
replace a 5U4 tube.
They used to tell me how can a little piece of wire with a bead on it
replace a tube as big as your fist
no freaking way. I also made a living selling 2.5 amp 1000 piv diodes.

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.


73 OM

n8zu