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Messages - Mads Barnkob

Pages: [1] 2 3 ... 43
1
Good to see you are taking on building a large DRSSTC, atleast that is the feeling I got when you are using SKM400 bricks.

There is a few plot holes in your plan. Driving SKM400 at 150 kHz is that something you calculated first? ( http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/igbts/ ) Sounds like its going to take some gate driving power and will dissipate quite some switching losses.

Your MMC is grossly underrated, you simply need to build something better and bigger. At 150 kHz that little poor thing will only handle 24Arms and even at 400Apeak you will be hitting 4500Vpeak and then you are not far from destruction of it. I used the Wima FKP as a substitute in MMC calculator ( http://kaizerpowerelectronics.dk/calculators/mmc-calculator/ ), but that also shows a 33 degree Celcius temperature rise at 200 uS/BPS, you are going to scorched that little cardboard and caps :)

I am not sure, but I think the UD3 was built to be used for QCW aswell, so I would expect it to work into some 500 kHz region.

2
I tried one more time, I started getting some output and then everything went quiet - probably burned out fets, because heatsinks were too warm for 10 second opertion.
Well, I head enough and put the entire thing into the rubbish bin to stop myself spending any more time and money on this project.
I learned a few things about electronics from this project, I also learned that I am not capable of building a simple circuit. My ambition was to build a large coil based on UDD 2.7 - I even bought all the components and pcb’s. That is far more complicated circuit and I have no chance in hell to make it work.

Anyway, thanks for your help guys and apologies for wasting your time !

Not always a bad choice to clean the table and walk away for a bit. Give it a few weeks and then start building your DRSSTC, if you already have the parts, just get going :)

I am struggling hard right now to fix my own DRSSTC1 that just blew the bridge on me, its been 3 long days of trying to get it to run again and I am also frustrated, but I keep going and I try to document my steps through it, so it can get online and help others.

I hope to see you back building the DRSSTC!

3
How was the heat dissipation during these tests?

You should really build a LC resonant load instead of a pure resistive, this would give you a more precise picture of how it will do as soft switching, as you also mention. Those Vce(sat) values and current should have made those poor IGBTs burn, but you only tested single pulses?

Just two days ago I blew up my DRSSTC1 full-bridge of 60N60, I will post about that when I got time, right now im just busy getting it to run again before I need it functional here on the 25th Feb.

4
Also are there any calculators for the ON Time?
Can the interrupter in my photo (which works perfectly for SSTC) work for my DRSSTC also ?

You can use the MMC calculator to see the effects of adjusting on-times, BPS, etc for all the specifications of your coil: http://kaizerpowerelectronics.dk/calculators/mmc-calculator/

Your interrupter will work fine for a DRSSTC if it has something in the range of 1-500 BPS and adjustable on-time from 0-300uS

5
That is one of the fundamental flaws in the oneTesla design, many people without experience buy these kits and have no knowledge of the figures mentioned about limiting on-time etc. It is a shame and I got no idea why they left out a cheap CT and comparator in a 400$ product...

6
question persists, if my coils are out of tune, can this fry my IGBTs?? :)

Short answer, yes.

But it requires some effort. When a DRSSTC is out of tune, the energy is not transferred fully to the secondary circuit and thus the current keeps circling in the primary circuit, here you have to rely on the OCD to save your IGBTs and MMC. But does the oneTesla have OCD?

7
I think the main reason for your failure was that you did not recognize that something was wrong, before feeding it full input voltage.

This is one of the reasons why I love variacs, you can slowly ramp up the voltage and see if the current rises quickly or if its pegging or if the variac starts humming loudly, all good indicators that something is wrong if you are not getting a spark output while it does so.

Quote
at 55VAC the pulp flashes, but tiny sparks (less than 0.5 CM).
at 110VAC the pulp flashes, but little bigger sparks (1 CM) drawn by a screw driver.
at 220VAC (15 A) the board dies and a short circuit happens on the supply rails , then I have to change the IGBTs!!!

Maybe it was out of phase, you had no real control of your MOSFETs state and it could have died from cross-conduction.

Its good that you now have a working coil as you now have a basis to work out from, you know the sounds and "feeling" of a working coil, which all can seem scary for the first time builder, as most people think something is wrong when you can hear the high frequency current.

8
DSLR / Video gear & workflow: Canon 5D mk3, Rødelink, FPS1000HD and more
« on: February 12, 2019, 08:51:43 AM »
/>
A walk-through and demonstration of all my video and audio equipment that I use for youtube videos.

9
Transformer (ferrite core) / Re: Homemade flyback on 60N60DLF full bridge
« on: February 11, 2019, 11:06:05 PM »
But it does have that "click" when first striking! Nice sparks from such a small food box :)

What kind of driver/control are you using for the 60N60 bridge?

10
I feel your frustration and believe me, I have been in the same place with so many projects. Just let it rest for a week or two if its driving you mental, then return to it with new ideas and energy.

The SSTC is quite sloppy in its design and stability, so the more complex DRSSTC can often be easier to find errors on as its better specified what signal is needed where.

Just give us some more details and we see if we can help you get this thing running!

11
Dual Resonant Solid State Tesla coils / Re: STB16PF06L
« on: February 11, 2019, 10:18:39 PM »
I use the common and cheap, through-hole, IRF540N and IRF9540N instead of the flatpak MOSFETs

12
It only took me a mere 4 years from I first started this article about the MMC until it is now done for public released :)

Not that it took me 4 full years to write on it, but it has been a on/off gathering of information and then finally making a write-up on it.

I hope this will help many builders understand MMC design better: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/mmc-tank-capacitor/

13
Beginners / Re: Keep or throw away ?
« on: February 07, 2019, 12:16:31 PM »
There are people that have successfully built SSTC with IGBTs, but IGBTs are really better suited for a DRSSTC.

So your little silicon stash here is perfect for a small half-bridge coil.

14
40N60 IGBTs should work as a fine replacement for the original IGBTs that you blew up.

Be sure to check all diodes, resistors etc. that is a part of the gate drive circuit. So any component from GDT to primary coil has to be checked, when there is a IGBT failure in a DRSSTC, it is common that the gate resistors, diodes or zener diodes dies aswell.

A oscilloscope is paramount necessary to trace down faults and errors on a SSTC/DRSSTC, there is simply not much idea in trying to do it without.

To learn more about how DRSSTCs work, Gao wrote some good short descriptions for his DRSSTCs: http://loneoceans.com/labs/drsstc1/ http://loneoceans.com/labs/drsstc2/ http://loneoceans.com/labs/drsstc3/

Also you should really check out my DRSSTC design guide for best practises: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/

Unfortunately is does not seem there is great success with most of the Chinese cheap drivers and products, you can find more topics discussing this on the forum if you search for "chinese".

A good stepping stone onto musical DRSSTC is to build a SSTC with a simple audio interrupter. Like a SSTC2: http://kaizerpowerelectronics.dk/tesla-coils/kaizer-sstc-ii/ with a audio interrupter: http://kaizerpowerelectronics.dk/tesla-coils/musical-sstcdrsstc-interrupter/


15
Voltage Multipliers / Re: Russian Marx generator test center torn down
« on: February 06, 2019, 08:47:55 PM »
more destruction pictures and some of the components they managed to save










16
Voltage Multipliers / Re: Russian Marx generator test center torn down
« on: February 06, 2019, 08:46:20 PM »
/>








17
Voltage Multipliers / Russian Marx generator test center torn down
« on: February 06, 2019, 08:45:25 PM »
This is a sad occasion to look at a huge Marx generator in Russia that has been torn down to make space for a shopping centre. Luckily a few Russian high voltage enthusiasts managed to save as many toroids and capacitors as they could drag away in a large trailer.

First post will be the before pictures and the second the after pictures.







18
I got the MMC article updated (password is still: "test"): http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/mmc-tank-capacitor/

MMC calculator has also been updated with the correct dissipation and temperature rise calculations: http://kaizerpowerelectronics.dk/calculators/mmc-calculator/

Please check it out and see if you can find any errors or suggestions for improvement :)

Now I just need to add some more pictures to the MMC design article and it will go "live"

19
Teravolt,  thanks for the links, a lot of interesting reading there. I have some time to read before my components turn up.

Mads, now I understand why driving the circuit from the FG is not a good idea - it does not allow itself to self-tune.
I still do not understand why UCC’s output 60/40 waveform, is this because I’m driving the circuit from the FG ? Will this change once I get feedback circuit working ?
Ideally it should be 50% duty cycle, right ?

You function generator could easily put out a waveform with a duty cycle distribution like that, that all depends on who you set it up.

A resonator like the Tesla coil secondary circuit or a GDT can never run at anything else than 50/50% duty cycle with some natural added dead-time from magnetizing currents shifting phase etc. So the feedback will always be tied to the sinus waveform of the secondary.

20
You have to understand that driving it with a function generator it will never be able to adjust itself to the changing resonant frequency of the secondary circuit. As the sparks grow the secondary circuit is loaded and its resonant frequency starts to drop. This happens at every single cycle, so it is critical that you get the antenna feedback to work as the first thing.

You are stressing your primary circuit by switching a large current that can not get magnetically coupled to the secondary circuit and transferred on to be sparks, instead the large circulating current in your primary circuit is destroying your components.

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