Comparison of Primary Transistors in Auxiliary Flyback Converters for Driver and Logic Supply from Mains-Fed DC Link

摘要

Substitution of MOSFETs by fast IGBTs in flyback converters is investigated: Those are assumed to provide isolated supply for drivers and control logic out of mains-fed DC link in a typical application like a three phase bridge for a variable speed drive. The surprising result is that relatively big differences in transistors' conduction voltage drop are much less significant than dynamic losses; this is important to economically design auxiliary converters and the respective devices.