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Non-memberThis paper proposes and describes an integrated battery charger configuration for a switched-reluctance motor (SRM) drive to be used in electric vehicles such as electric motorcycles. The proposed configuration can share switching devices, inductors (motor-phase winding inductance), and a control board with the SRM drive. Moreover, it can be operated as a buck-boost converter, a buck converter, a boost converter, or a cascade buck-boost converter. In addition, for improved efficiency, additional high-frequency (small size) inductors can be added to the converter circuit to replace the inductors of the motor's winding coils. A 500-W 220-V experimental system was designed, constructed, and tested based on a 32-bit digital signal processor (TMS320F28027) with the use of SiC and Si MOSFETs as switching devices.

This paper describes two-triangle carrier sinusoidal pulse-width-modulation (SPWM) for a five-level diode-clamped PWM inverter and compares it to the SPWM-based neutral-point-clamped (NPC) PWM inverter and the original SPWM-based five-level diode-clamped PWM inverter for use in medium-voltage motor drives. The characteristics of the three techniques are compared by analysis and experiment for an adjustable-speed motor drive for pumps and blowers without a transformer. The experimental systems are 380-V 5.5-kW downscale models. The experimental systems were designed, constructed, and tested for the comparison study and were based on a 16-bit digital signal processor with the use of insulated gate bipolar transistors as switching devices. A 5.5-kW four-pole induction motor coupled with a permanent-magnet synchronous generator was used as the electrical load.