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Registered Member #2922
Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
5.those IGBTs can't handle 700A no way, don't run them higher than 500A
Did you test this??
I have already saw people runnig this igbts at 600A with no problens.. i think that this can manage more with over voltage at the gates, like 30v or more.. and what is the big diference between this and the 40N60?? in datasheet the 60N60 apear more robuts..
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
Gregory wrote ...
5.those IGBTs can't handle 700A no way, don't run them higher than 500A
Did you test this??
I have already saw people runnig this igbts at 600A with no problens.. i think that this can manage more with over voltage at the gates, like 30v or more.. and what is the big diference between this and the 40N60?? in datasheet the 60N60 apear more robuts..
On my coil I'm continuosly hitting 600A and during groud strikes i trip the OCD (650A). I monitor the primary current with a CT+burden (1/100 voltage:current ratio) and a scope.
So, I would say that 650A are fine with this devices...
And my Vge is just +/-21V. I have to say that I use phase lead in my controller, this may improve the situation (minimal swithcing losses...)
However, I have just tried rising the secondary 1.5 cm more (calculated k=0.12) and I haven't found any racing sparks... I have obtained nice thick sparks to a grounded target at 130cm with the variac at 60%...
Registered Member #2922
Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
Gregory wrote ...
5.those IGBTs can't handle 700A no way, don't run them higher than 500A
Did you test this??
I have already saw people runnig this igbts at 600A with no problens.. i think that this can manage more with over voltage at the gates, like 30v or more.. and what is the big diference between this and the 40N60?? in datasheet the 60N60 apear more robuts..
On my coil I'm continuosly hitting 600A and during groud strikes i trip the OCD (650A). I monitor the primary current with a CT+burden (1/100 voltage:current ratio) and a scope.
So, I would say that 650A are fine with this devices...
And my Vge is just +/-21V. I have to say that I use phase lead in my controller, this may improve the situation (minimal swithcing losses...)
However, I have just tried rising the secondary 1.5 cm more (calculated k=0.12) and I haven't found any racing sparks... I have obtained nice thick sparks to a grounded target at 130cm with the variac at 60%...
Regards,
Luca
This is what i think, with 30v at gates, this igbt can manage 700A or more like the 40N60..
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
Here a video of my coil:
Distance from the grounded target and the tip of the breakout point is 140cm. Peak current is 600-650A and input voltage is around 180V (70% of the variac). ON time is 150us, 150 BPS.
For some strange reasons now I am able to run the coil with a higher coupling than before without any racing sparks... (now k is 0.14-0.15...)
What I have now is just occasional flashover between secondary and the strike rail (as you can see in the video)... I should solve this issue increasing the diameter of the strike rail (now is just few cm larger than the primary) an lowering it a little.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Great work Luca
We got almost identical DRSSTCs and the same for the performance, I am sure I could fine tune my own further, but at full voltage in, 230VAC at 500A OCD, I can achieve 150-155 cm sparks.
I am looking forward to see updates on your tuning :)
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
Mads Barnkob wrote ...
Great work Luca
We got almost identical DRSSTCs and the same for the performance, I am sure I could fine tune my own further, but at full voltage in, 230VAC at 500A OCD, I can achieve 150-155 cm sparks.
I am looking forward to see updates on your tuning :)
Hi Mads, yes, I have seen video and pictures of your Kaizer DRSSTC... Actually, your coil is a bit bigger and certainly far better made than mine... Very nice job...
Anyway, I think you could obtain better results pushing the IGBTs a little bit more... I continuosly hit 600A and sometimes 650A without any problem. I think that the weakness of IXYS 60N60 have been exaggerated a bit and 500A is really too conservative.
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
A quick update... I have solved my flash-over problems and I have increased the OCD limit to a nominal value of 700A. Actually it seems that sometimes OCD trips at lower values (around 650A) but with the scope I was able to capture peaks to 700A, see next scope screenshot (1V=100A):
Another screenshot which shows clearly notch in the primary current. It is still not clear to me if this behaviour is good or not...
Here some other pictures and video. Now I get stable 140cm and ground sparks.
Registered Member #2922
Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
Very good result with 60N60 man!!!!!!! what is your BPM and Pulse Width in the video? The OCD can trip at lower values because you circuit is getting noise.. And I think you can maker a better current envelope, with not the notch, adjusting more the tune.
And how you solved the flash-over problems? reducing the coupling?
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
Gregory wrote ...
Very good result with 60N60 man!!!!!!! what is your BPM and Pulse Width in the video? The OCD can trip at lower values because you circuit is getting noise.. And I think you can maker a better current envelope, with not the notch, adjusting more the tune.
And how you solved the flash-over problems? reducing the coupling?
Thanks Gregory! BPS is around 120-130 while ON time is 200us. I know that it is a pretty long on time but reducing it I obtain shorter and less intense sparks...
Flash over occurred between the lower part of the secondary and the strike rail. I simply solved the problem increasing the diameter of the strike rail.
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My first DRSSTC - Video added
