Although there exist very high bandwidth optocouplers, I’ve found many IGBT/MOSFET drivers still use pulse transformers for isolation. Why is it the case, when we know that optocoupler has no need for number of turns calculation, winding, etc. and is easier to assemble and does not require extra latch/Schmidt trigger circuits. Someone told me pulse transformer gives better and more reliable Isolation, is it the case?
Thanks for replies in advance
4) you need alot higher isolation then commercial opto's provide thus winding yr own can provide this
5) you have silly design rules that say "tho shall not use opto-electronics"
I suspect that opto-isolators have replaced pulse transformer in many applications, but there may always be cases where the transformer may have advantages as already stated and say where you require a center tapped secondary so that two 180 degree out of phase signals are available.
Thank you all. Besides, pulse transformers are bidirectional, you can send PWM and receive fault signals via the same transformer (in the form of very short duration impulses).