Author Topic: DRSSTC design questions + project progress  (Read 4827 times)

Offline Vaclav

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Re: DRSSTC design questions + project progress
« Reply #40 on: March 25, 2020, 03:31:55 PM »
I already hit the current limit of 800A, idk if I should go higher.
I did all my calculations based on 800A peak, I really don't want to risk the IGBTs or MMC....
But at lower BPS a higher current should work.

I ran a test without the secondary. Just to try out where the limit of the mains input current is (my varica gose up to 10A)
I used the maximum On-Time to get 800A. (I can't remember the On-Time and the bus voltage...)
With about 1700BPS I hit the 10A input current restriction.
The heatsink got warm (was easily touchable).
But the 16mm² cable to the primary started smelling...

I know 1700BPS is huge, I don't think a higher current and lower BPS would be a problem temperature wise.

I have absolutely no clue where the limit of my IGBTs is.
I used FF400R12KE3 for my inverter.
Where is probably the limit of these IGBTs?

I planed to tune the coil a litle bit better (don't have mutch hope ^^).
When the tuning is perfect, I will shorten the rest oft the excess cable to the exact length.
I although want to do some tests with an MIDI-Interupter.

Unfortunately I can't do tests that often because one of my neighbours complained about the Teslacoil.
I really don't want to get in trouble with him.

Nevertheless, destroying the coil would be horrible because I want to bring it to school for the presentation of my project.
Maybe I'll run it there.

I will share my documentaion here, but first I have to complete it.

Offline davekni

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Re: DRSSTC design questions + project progress
« Reply #41 on: March 25, 2020, 05:51:20 PM »
FF400R12KE3 is specified at 800A pulse current (at 1ms), so that should be plenty safe.  Looking at the typical plots, there appears to be quite a bit of headroom past 800A, especially if the gate voltage is above the specified 15V.  Hopefully others here will offer advice from their more extensive experience.  My limited info from other IGBT bricks is that they tend to fry at about 2x their pulse rating or 4x their continuous current rating, which would be 1600A for this part.  I'd suggest staying well below 1600A.

Inductance of your bus voltage routing, from the IGBT parts to snubber and bulk capacitance can be limiting too, if transients exceed 1200V.  A good layout with low inductance should keep internal IGBT voltages well below 1200V even up to 1600A.
David Knierim

Offline Mads Barnkob

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Re: DRSSTC design questions + project progress
« Reply #42 on: March 30, 2020, 12:12:15 AM »
Similar "400A" rated IGBT bricks have been pushed to 1300A in reliable operation. So 800A is certainly nursing them :) I think you could push it to 1000A and still be playing it safe. Depends on your MMC design if the resulting higher voltage and current is still within the limits of it.

See the table for IGBT proven speeds/currents at bottom of article here: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/igbts/
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Vaclav

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Re: DRSSTC design questions + project progress
« Reply #43 on: April 03, 2020, 03:07:13 PM »
Here is the promised data.

The documentation is unfortunately larger than 5MB. Therefore I upload it here in 2 parts and as "better" version in my dropbbox.
Link to documentation with clickable links: https://www.dropbox.com/s/lohkbcrhsjiszgs/Doku_klick.pdf?dl=0

I will first do some experiments with a musical interrupter.
After that, I'll crank the current up.

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Re: DRSSTC design questions + project progress
« Reply #43 on: April 03, 2020, 03:07:13 PM »

 


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