Hello, i think i need to add another GDT transformer. At the moment i am using one with 4 secondary windings (Schematic is using wrong transformer).
Yellow trace in pictures is Vgs, blue trace is Vds. measured on transistor Q2
Turning on is okay, howeever turning off is quite bad. There is some ringing probably due miller capacitence coupling to gate of mosfet.
Fullbridge control chip is TL494.
When GDT is off, both gate drivers is off. I though that transistor will turn off via gate resistor, it does but not nicely =D.
I think i need to make another GDT. One for controling Q1, Q4 and for Q2 Q3. Only difference will be, that driving voltage for gate will go directly to negative side. So there wont be a gap where voltage on GDT is zero. That should solve my problem. What do you think?
Thanks