Phase shifted bridge shut down

[thaumatichthys]

If I am not mistaken, shutting down a DRSSTC usually means waiting for a zero crossing in the primary current, then shutting down the gate drivers, but how does this work for a phase shifted full bridge? For example because of the overcurrent detection being triggered or something similar

Could such a bridge just be shut down at any time, since half of it is constantly hard switching anyway?

[davekni]

Could such a bridge just be shut down at any time, since half of it is constantly hard switching anyway?

Likely so.  If you are sequencing which IGBTs experience hard switching to even out power dissipation (recommended), then best to shut down the next IGBT in sequence first, then others at zero crossing.  That avoids overheating an IGBT that had just hard-switched on the previous half cycle or two.

[Coupling]

I think you're probably fine with a hard shut down. I personally set the phase shift to zero and then shut down a millisecond later.

[thaumatichthys]

Ah I see, thanks guys!