Hi!
So, to my limited understanding, i would say that is better to create a new gate driver that reach at least the 10v gate charge, eliminate that oscillation on high side and check the switching losess to see if there is enough gate charge...
Can someone please help me, and tell me if i'm going in the wrong direction?
Really thanks, any help is much appreciated :-D
Will do itIt looks like the pdf has a bridge driver chip directly to the gates and yours has a gate transformer.
I am very interested in welders from the high power design point and the high frequency/arc starter circuits. I will wait for your CAD schematic and i hope you post some pictures of the electronics especially the power and starter sections.
Where? The TIG inverter is using high kHz frequency.switching losess are not much important as ac/dc switching frequency is only 60hz
Apart from being quite dangerous, the method can't be expected to give acceptable measurement signal quality. Isolation transformer isn't much better for measurements at fast switching circuits with superimposed high frequent common mode signals, HV differential probe is the only reasonable option.I've isolated the groud of the scope (paying attention to not touch metallic things, as i haven't an isolation transformer under the hands), maybe this is the cause.
TIG uses HF to generate isolated high current DC (basically switcher instead of the traditional heavy transformer). After that the DC is converted to 60Hz by another inverter which drives the electrodes.Where? The TIG inverter is using high kHz frequency.
Hum, seem a thing to be added to my tools... They seem quite expensive (half the costs of the scope 8-O:lol::lol: ).Apart from being quite dangerous, the method can't be expected to give acceptable measurement signal quality. Isolation transformer isn't much better for measurements at fast switching circuits with superimposed high frequent common mode signals, HV differential probe is the only reasonable option.
Uhm, maybe i can try to use the math function of my dual channel scope? I get best results? I was searching but that probes costs really a lot
And as i will use it only in really few occasions, i'm not sure if it worth...
I've also seen some DIY projects over the net, but i'm unsure about the quality...
Done:Maybe you should give more serious consideration to my advice in post #7.
The simulator in my brain tells that if you reverse the zener the gate drive will swing from +12V to -5V.
I know little about simulators. Can your simulator give a picture of the gate drive? can you post the picture in a picture type file (gif, jpg, etc) ?
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