I will build this. Hopefully I won't kill too many IGBTs. I will report the results in like a month

I would say, try to rearrange those zener diodes like Fumeaux showed in his fixed schematic.

Yeah, it should be like this

You have a message

You should also see a doctor about that cough 

Haha

I use minwax polyurethane which comes in a spray on or brushed on. I use a low tack tape like masking tape, blue tape, to hold it to gether and not loosen up and to hold it in case of a winding error breaking. hear is an example

https://www.loneoceans.com/labs/qcw/

:O It's so expensive and the only place I can buy it from is amazon. Better stick with my stuff and the coil warped because I didn't rotate it. Now my small coil is rotating and holding strong with third coat

It also comes in tins for application by brush.
I also used "Cabothane" Polyurethane Varnish - it is a lot cheaper.
As far as your secondary is concerned, I have no idea why it did that. If your windings were nice and tight to start with, only reason I can think of why they would go loose and jump onto each other is if your secondary form ( PVC pipe I guess ) reacted with the varnish and collapsed.
Or, windings were not tight enough and slipped down ( you mentioned that it was standing upright overnight ).

You can build a simple jig for winding and varnishing using an old windscreen wiper motor, it is already geared down and slow turning. Connect it to a lab power supply and feed it just enough power so it turns slowly, or better, you can use a cheap PWM controller from eBay.

I actually have a crashed car which I can take the windshield wiper motor off and a lab bench supply, but I also have a motor from a old printer and it rotates pretty slow at around 1 volt so that's what I will use. And I use a varnish from a tin can, so I have experience with them. But it bugs me out that I can't just buy a 100% or so polyurethane varnish. I don't know if there's a law that makes them illegal or something but I should check that out. Thanks for helping me

Hello, I want to know which varnish should I use to coat the secondary coil, because the one I have is meant for wood and it messed up my coil's windings. The varnish contains: acrylic dispersion, polyurethane dispersion, water, glycol and additions

The cause may be because I didn't keep the coil rotating while it was drying so that may be the cause of this problem (I didn't experience the same with my micro coil)

I would buy this https://www.tme.eu/gb/details/ep108/encapsulating-materials/huntsman/cw5620-hy5610/ but it's not available in my country and I can't source something similar. So can you recommend me a varnish that you know works 100%?
Thanks

-SNIP-

So basically, it's good to drive a SSTC with it but missing an OCD to drive a DRSSTC propely.

And if I add an OCD to this circuit I basically end up with UD1.3 or earlier?

So I am struggling to find a place where I can source components for fiber/opto isolated interrupter, so I want to know any Ebay links or tme.eu parts which will work or something and make this thread useful for people to use when they struggle to find it too. I looked up onetesla.com and they sell the fiber cable (10$), transmitter (8$) and a receiver (8$). Although I wouldn't mind paying something like 30 euros for those things+shipping but it's not always in stock and I struggle to find similar components on ebay. So, can anybody reveal his secret source of buying those components? Thanks

Hello, I want to make my own SMPS, but I can never find a way to calculate the VA rating for a ferrite core and I want to know who knows the equation for calculating VA rating and or the required turn/frequency for wanted or max wattage or something.

I would use this core FERROXCUBE ETD49/25/16-3F3 https://www.tme.eu/en/Document/882e54fb8772e021c51c30b1d1879eab/etd49.pdf
and I would like to make at least 500-600W variable voltage power supply (if the core is suitable), but I don't know the calculations required to do this. But for now let's have a fixed IN, OUT voltage and out A
Let's say the PSU will work with 230V AC, so 325V Peak, the power of 600 watts, Max current input of around 3 amps and the output voltage of 60 volts and output current of 10 amps and the switching topology is half bridge using mosfets.

How do I get the required turns/operating frequency and wire thickness for the primary and turns and wire thickness/turns for the secondary with the values that are written in the datasheet? I found this

Using the Ampere's law, you can get the following equation:

E = Ae² * B² / (2 * AL)

E: energy stored in the magnetic field
Ae: core's effective area
B: maximum flux density allowed by the core material
AL: core parameter, depends on Ae, magnetic circuit lenght and air gap lenght

You see, power (P) is enery by time. More energe and less time will result in a higher power.

P = E / t

The input power at the inductor is the energy stored (E) divided by ton. Ton is the duty cycle (D) divided by the switching frequency (fsw).

P = E / ton = E * fsw / D

This is an aproximate way to determine how much power you can obtain from a certain core. Actually there are losses by eddie currents, joule effect and stray flux.

But this equation needs the operating frequency for power calculation, so I can't learn much from it.
 
Helpful info
The 3F3 core parameters from Ferroxcube website:



PS: I am not asking you to calculate the things for me, just to help me and/or show us the equations for the things so it helps the people that will look for it