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Old 29th March 2010, 09:33 PM   #11
mgm2000ro is offline mgm2000ro  Romania
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top pictures are without snubber
whit snubber 22nF + 10 ohm/3w on primary (not GND), whit no load.
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File Type: jpg 1.jpg (58.1 KB, 108 views)
File Type: jpg 2.jpg (67.3 KB, 106 views)
File Type: jpg 3.jpg (494.3 KB, 103 views)

Last edited by mgm2000ro; 29th March 2010 at 09:41 PM.
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Old 29th March 2010, 09:35 PM   #12
Andrew Eckhardt is offline Andrew Eckhardt  United States
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What's the deal with the first and third waveform shots you last posted? Presumably those are both sides of the push-pull? The last one looks passable. If you have the same circuit and are getting different results, then you don't have the same circuit. The layout must be an issue.

(well I meant the post before the last)

Last edited by Andrew Eckhardt; 29th March 2010 at 09:37 PM.
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Old 29th March 2010, 09:39 PM   #13
mgm2000ro is offline mgm2000ro  Romania
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Whit the same pcb and irfp1405 the problems is gone!
I guess my problems is the large input capacitans of irfp2907pbf.
What can I do?
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Old 29th March 2010, 09:41 PM   #14
Andrew Eckhardt is offline Andrew Eckhardt  United States
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Can you post an overlay of the gate and drain waves for one FET?
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Old 29th March 2010, 09:48 PM   #15
mgm2000ro is offline mgm2000ro  Romania
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wave form pin 1-3 mosfet
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Old 29th March 2010, 10:02 PM   #16
Andrew Eckhardt is offline Andrew Eckhardt  United States
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I meant can you post a shot of gate and drain pulses on one oscillogram. I'm trying to figure out exactly what's starting to happen 1uS after the rising edge of the drain voltage. Try the gate of one side drive and the drain of the other.
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Old 29th March 2010, 10:21 PM   #17
mgm2000ro is offline mgm2000ro  Romania
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wave form yellow pin 1-3 (mosfet-1) blue pin 2-3 (mosfet-2)
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Old 29th March 2010, 10:39 PM   #18
Andrew Eckhardt is offline Andrew Eckhardt  United States
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I think your turn-off/on might be too fast for these big transistors.
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Old 29th March 2010, 10:44 PM   #19
Andrew Eckhardt is offline Andrew Eckhardt  United States
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Does increasing dead time not help at all?
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Old 29th March 2010, 10:51 PM   #20
mgm2000ro is offline mgm2000ro  Romania
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I'll come back with changes tomorrow. Thank you very very much!
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