Author Topic: Problems with my first DRSSTC  (Read 62 times)

Offline bozidar

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Problems with my first DRSSTC
« on: August 05, 2019, 10:04:50 PM »
Hello.
I'm making DRSSTC and I'm having some problems, so I hope one of you can help me.
First problem is Vge overshoot.In attached images you can see gate-emitter voltage (yellow signal), primary current (blue signal) and Vce (green signal).


This is core that I use for GDT and CT https://www.aliexpress.com/item/32857367831.html?spm=2114.search0104.3.15.968a6e5f9nOtT4&ws_ab_test=searchweb0_0%2Csearchweb201602_9_10065_10068_319_10059_10884_317_10887_10696_321_322_10084_453_10083_454_10103_10618_10307_537_536%2Csearchweb201603_53%2CppcSwitch_0&algo_expid=1e5a0c1a-4811-4a8e-926b-6c1f0134c046-2&algo_pvid=1e5a0c1a-4811-4a8e-926b-6c1f0134c046 .
I'm using calculations for GDT from this site: http://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-i/.
For my GDT, I put only 4 turns of 5 twisted wires .I use 5 twisted wires  that are wrapped with aluminum foil and all this is put into the shrink tube (handmade) to minimise leakage inductance.
That is explaned here http://thedatastream.4hv.org/gdt_practical.htm
I tried to reduce voltage oscillations on gate-emitter by lowering leakage indutcance of GDT , but without much succes.
Then I bought this core https://export.farnell.com/epcos/b64290l0048x830/ferrite-core-cylindrical-34mm/dp/2355017?ost=B64290L0048X830&ddkey=https%3Aen-EX%2FElement14_Export%2Fsearch to try to get better results, but the results were the same.
I use 5.1 Ohm resistors with reverse diode and P6KE30CA diodes across the gates.

I put on an 11 Ohm resistor today and I got a lot better waveforms , but I don`t know is this resistor too big because rise and fall times are little slower(around 300nS) .



My second problem is that all the time i have had problems to make the coil  work properly. When I set the freq to 3kHz and 200us on time the coil did not want to start to work, and if i decrease freq or on time everything returns to normal. That happens on low voltage on Vbus ( 18 V ) and when I put 310V on Vbus the coil  will not work at all (of course ,with low on time, 10us ).When I connect a small cap (100pF) between the ground and one GDT of the primary output connector, the coil works again as it should ( 18V -Vbus ). I really don't know how to fix this and what can cause this?
I check all connections,igbts,caps etc and everythig is allright. That happens with low voltage (18VDC) on Vbus and also with full voltage ( 310 VDC ).(I just decrease supply voltage between 15V and 18V to keep Vge peak under 30 v).
I have already connected the coil to 220VAC twice and it worked properly but now it will not work properly again, only if I put 100pF cap as I mentioned before(with 18V on Vbus).
Therefore sometimes the coil works properly and sometimes it does not.

I made almost identical Loneoceans UD2.7, just with through hole components. In place of optic fiber receiver I'm using arduino nano with optocoupler . Arduino comunicate with my phone over bluetooth. I wrote code for arduino that generate impulses with variable frequency (1 Hz - 20kHz) and on time (1 - 200 us).
Specs:
Bridge : 4x IXGN60N60C2D1 (full bridge configuration)
Primary resonant frequency : 149 kHz
Secondary resonant frequency : around 160kHz
MMC: 4 strings in parallel of 4 in series WIMA FKP1 capacitors for 68nF at 8000VDC
The coil is not big , secondary is around 23 cm tall and 7,5 cm in diameter. I plan to set current limiter to 300A.
Sorry for my bad English and thanks for the help.
« Last Edit: August 05, 2019, 11:00:08 PM by Mads Barnkob »

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Problems with my first DRSSTC
« on: August 05, 2019, 10:04:50 PM »

 


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