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Old 2nd May 2009, 10:07 AM   #1
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Question 15v / 200a Help!

Hello Everyone !
Please help to find corect value of RC SNUBBER and corect drowning on schematic !

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Waveform on primar without SNUBBER , this happened when start (0 to 42% duty) !
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Waveform from sg352 and gate IGBT
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at 310vdc without SNUBBER blow

thanks for help !
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Old 2nd May 2009, 12:27 PM   #2
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That looks like a beast of an SMPS! I'm not sure of your snubber values, but that thing looks setup for serious power!
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Old 2nd May 2009, 01:39 PM   #3
star882 is offline star882  United States
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There is a mistake in the design. 6A input will not be enough to get 200A output at the input and output voltages.
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Old 2nd May 2009, 01:47 PM   #4
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thanks for help !
I will change !

The problem is RC SNUBBER value!
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Old 3rd May 2009, 07:01 AM   #5
mflorin is offline mflorin  Romania
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the values of RC snubber components are directly related to parasitics in your transformer and layout.
Measure the ringing frequency at mosfets turn-on/off, then choose the resistor snubber value equal to the characteristic impedance given by measured leakage inductance: R=2*pi()*Fringing*Lleakage.
The capacitor value comes immediately: C=1/(2*pi()*Fringing*R).
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Old 3rd May 2009, 09:27 AM   #6
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Multumesc!
thanks for help Florin !
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Old 3rd May 2009, 10:13 AM   #7
luka is offline luka  Slovenia
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Any pictures of this beast? Trafo, did you build it or what?
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Old 3rd May 2009, 07:24 PM   #8
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: Hello Luca. There is no beast...yet. Right now it is in the design / testing stage and everything looks very ugly. I didn't have time to draw a pcb so everything is connected with wires at this point. I managed to acheive something good at 30kHz
I increased the frequency to 50kHz and I want to re-calculate the correct values

32Khz ringing 12,82Mhz
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32Khz whit snubber
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32Khz in Power, primar I=3A, U=90v
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Waveform at 50khz whit snubber
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All tests were made at 30v and 100v
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Old 3rd May 2009, 07:43 PM   #9
luka is offline luka  Slovenia
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more dead time on second, I think it was 32kHz picture. slope should go all the way up..
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Old 3rd May 2009, 08:00 PM   #10
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Now I'm playing with 52khz

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RC SNUBBER IGBT R=22 C=4,7nF Uin =30v

what is your opinion?
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