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Old 12-27-2016, 04:28 AM   #2948 (permalink)
arber333
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Join Date: Jul 2011
Location: Slovenia
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Well i hope you all had merry christmas and i wish you happy transition to new year 2017, to be close to your families and successful.

Quote:
Originally Posted by kalidasbala View Post
Thanks Paul. I am planning on 600V 2000uF elcap and 600V 2uF snubber.

Update: Ok, this is what I got 450V 2200uF elCap and 1.5uF 1000V snubber caps (2 of them). Hope it is ok for an IGBT 600V 400A (mitsubushi- powerex)
Right now i use 2x 100uF 800V in paralel. FFVE6B0107KJE AVX Film Capacitors 800volts 100uF 10% (1 PER) | eBay
They are AVX film caps, very fast and one can sustain 90A in DC link function. I put them in my car instead of two elcaps 4700uF 500V in series and i can see difference instantly. Theres more energy available for instant acceleration, otherwise no special difference.

And of elcaps... if you use them, try making a good rail connection, not wire from elcap to rail. Once my wires from caps to rail melted due to my overzealous testing of low voltage motor operation. I threw elcaps out and i use exclusively film caps now connected with at least 1mm x 15mm copper rails.

Snubbers i use 3x 2uF 1200V. RoT is cca 0,6uF per 100A of IGBT. They have to be fitted directly to IGBT +/- rail contacts to be of any use.
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kalidasbala (12-27-2016)