Yes most of them are AC to DC converters I had faced a similar situation with 2012 phv Prius where owner had plugged in the power adapter in wall socket with 220 and inverter along with bms was fried.
Another case of same happens with a UK varient phv Prius same happens and the soloition was a chopper based 3500w step down voltage converter.
Stabilizer based converter is useless and it get hot frequently so chopper based converter is best.