Doctorbass wrote:Nice project Zombiesss
Why did you choosed the 150V fets?.. we debated that many times and the 4110 100V can give 33% more power due to their twice higher current.
Maybe you want ... pure SPEED
That remind me to finish my 36 fets projects!
DOC EXTREME 36 fets project
Lebowski wrote:I found this article about gate driver setups and circuits and stuff. I read through it
and agree with what it's saying. I would observe the gate signals and would not add
any gate resistors if you son't see any ringing. Another thing to check for, maybe the resistors
are not in the gate but in the source line. Also look at the drain-source signals for
overshoot, add snubbers if necessary (see passive snubbers article, this one also
makes a lot of sense to me).
zombiess wrote:So many projects so little time. My to do list is getting longer
Lebowski wrote:zombiess wrote:So many projects so little time. My to do list is getting longer
Same here. I switched to working only 4 days a week last january just to have more time for all my projects, cycling, GF etc etc.....
Just watch out with the high current and over-volting the drain / source of the FET's.
More current means more energy stored in the PCB track parasitic inductances, which
translates to higher voltages spikes accross the drain / source on FET turn off.
With 150V FET's on 100V supply, additional snubbing may not be necessary but I'm not
taking the chance with mine...
zombiess wrote: with some additional low ESR 1uF 250VAC caps to hopefully help. Not a really a snubber setup, but they help absorb the spikes and save the FETs.
auraslip wrote:Out of curiosity, how much do you think a stock lyen 18 fet can handle compared to your 18 fet?
The case of my 18 fet gets warm running it a 4kw.
drunkencat129 wrote:me and stevo did 150v controller with 4115 thay whould blow out under load and did it on a 32fet did same we changed fets to bigger batch fets and problem was gone it may have somthing to do with switching because only one whould blow ramdomly threw out the controller we wired the 12fet with the bigger batch and workes like a charm now we need to make an adapter to do an 18 fet
zombiess wrote:drunkencat129 wrote:me and stevo did 150v controller with 4115 thay whould blow out under load and did it on a 32fet did same we changed fets to bigger batch fets and problem was gone it may have somthing to do with switching because only one whould blow ramdomly threw out the controller we wired the 12fet with the bigger batch and workes like a charm now we need to make an adapter to do an 18 fet
I had over 100 IRFB4115 FETs and I matched each banks resistance at 4V gate voltage. Some of the banks are using the Halogen free version because I had some of those as well and they all had really low resistance at 4V Vgs. Out of all my FETs I chose to match the banks with the same version (didn't mix halogen free and lead free versions) and also the ones which had the lowest resistance at 4 volts of Vgs in the hopes that if the gate drivers were a little on the weak side that this would aide in switching at the same time for equal current sharing. I'm also only running 126V max through the controller so I have head room. I thought I read that Stevo did 144V max voltage which is only leaving 6V before the absolute max voltage rating.
Wish me luck, changing blown FETs is a PITA. I hope what I'm doing will minimize problems. Like I said though, so far so good on my 18 FET 4115 controller for about at least 150 miles of use at 60-105A and it's FETs aren't matched.
It is good to hear that once you guys start using a large batch everything was working OK. What voltage did you guys run and did you match the FETs for their Miller Plateau voltage like I did? Also, what was the most watts you pulled out of these. Max battery amps @ voltage and max phase amps you tried and had it all live?
auraslip wrote:Sounds awesome. You're doing a lot of really cool things lately!
Arlo1 wrote:Cool man.
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