Iron Losses in Non-Oriented Electrical Steels Excited by Three-Level GaN PWM Inverter

This work presents an experimental evaluation of iron losses induced by a pulse-width modulation-driven three-level gallium nitride inverter in toroidal magnetic cores made of thin non-oriented electrical steel. The challenges associated with measurements at high fundamental and switching frequencies are discussed. Additionally, a comparative analysis with conventional two-level inverter technology is provided, highlighting key differences and demonstrating the potential advantages of adopting multilevel inverters. On the other hand, the loss prediction under the commonly used two-level technology supply is further presented and critically discussed.