Skip to main content
APEC 2026 Main banner

    Wireless Charging

    T16.5 - Higher Order Harmonics Suppression for GaN-Based High-Power Multilevel Inverter in Wireless Power Transfer Systems

    Wednesday, March 25, 2026
    9:50 AM - 10:10 AM CT
    Location: 217D
    This paper investigates suppression of higher-order harmonic distortion in a GaN-based neutral-point-clamped (NPC) three-level inverter for a series–series compensated WPT system. A multi-objective reward function is proposed to select the optimal combination of θ₁ and θ₂ that simultaneously enhances the fundamental RMS voltage and suppresses dominant harmonic components. A 1.5-kW prototype is designed built, and seven case studies with a 300-V input are conducted. Measured results show that increasing θ1 and θ2 can reduce THD by more than 4.93%, and that the inverter achieves an optimal operating point at θ₁=θ₂=15°, where the power inversion efficiency reaches 98.51% with a third-order harmonic of 12.98% and THD of 20.70%.