SEVEN-LEVEL SIC-MOSFET MODULAR HIGH-VOLTAGE PULSEGENERATION FOR ADVANCED ELECTRIC VEHICLE MOTORINSULATION TESTING

Abstract

As the global electric vehicle (EV) market expands, insulation-related failures have emerged as aprimary threat to motor reliability, particularly under the high-frequency switching and elevated voltagestresses of modern inverter-fed drives. Accurately assessing dielectric degradation and partial dischargeactivity under realistic conditions is vital to ensure operational safety and reduce manufacturing costs. However, traditional high-voltage pulse generators suffer from high harmonic distortion, poor voltageresolution, elevated switching losses, and an inability to replicate fast voltage transitions. Toaddress these limitations, this paper proposes a seven-level modular high-voltage pulse generatorutilizing Silicon Carbide (SiC) MOSFETs and a Sinusoidal Pulse Width Modulation (SPWM) control. Toaddress these limitations, this paper proposes a seven-level modular high-voltage pulse generatorutilizing Silicon Carbide (SiC) MOSFETs and a Sinusoidal Pulse Width Modulation (SPWM) controlstrategy. The system features a seven-stage modular architecture that employs parallel capacitorcharging and controlled series discharging. By leveraging the fast-switching speeds and low losses ofSiC devices alongside SPWM, the generator delivers precise waveform control, reduced harmoniccontent, and exceptional efficiency. The proposed framework provides enhanced insulation stressemulation, offering a highly reliable testing paradigm for modern EV traction motor insulation.