Sg3525 with ka3525 is same mr.silvio, ??
No I do not think you need to add GDT to drive IGBT in parallel as long as the smps works in full duty cycle. The reason is that if the smps has to work with low pulse width then the bootstrap capacitor will not have time to charge properly and problems may arise.
If you are going to use feedback then you have to use GDT for sure switching on the IGBT. Here you have to be careful and see that the switching pulse must be at 12- 15v at all times.
Adding feedback may not be as simple as it seems and if you have no oscilloscope you cannot see what is happening.
I never built an smps with gate drive transformer and I have no detail for it.
I will add photo of parallel IGBT from home as I have a problem with uploading files from here.
Regards Silvio
Please check my pcb mr.silvio
make corrections as marked with red markings. press on them and see note on side
View attachment 6681
Hi mr.silvio, i only have some rur3060 diodes and some 30cph03, is that a problem, ??? diode with 2 legs only mur1560 i have
RUR3060 seems with 30 ampere capability
Hi mr.silvio ,, if i change the frequency on the pwm card to 25khz, will the DT Resistor be the same, or have to adjust it again, (without feedback)