A Bidirectional Interleaved Totem Pole PFC-Based Integrated On-Board Charger for EV SRM Drive

Abstract

This paper presents an improved integrated on-board charger (IOBC) tailored for a 4-phase switched reluctance motor (SRM) drive. The proposed IOBC is non-isolated and utilizes the totem pole power factor correction (PFC) operation for reduced common-mode voltage. Furthermore, the proposed system accommodates bidirectional functions, ensuring versatility during charging mode. A non-isolated IOBC for SRM with reduced common-mode voltage and bidirectional capability has largely been ignored in the literature. The proposed system utilizes a modified Miller converter in the motoring mode and is easily reconfigured into a two-phase interleaved totem pole converter during charging modes without the need for any magnetic contactors. The proposed system features zero instantaneous torque (ZIT) at steady-state, ensuring minimal machine wear during charging modes. The proposed IOBC is controlled to ensure symmetric positive and negative grid currents for any given rotor position (during charging), thereby eliminating even harmonics and enhancing the power quality of grid current. The proposed system achieves charging power twice the motoring power with parallel-connected phase windings. Ansys electromagnetic transient simulation, MATLAB-based SRM drive simulations, experimental results, and comprehensive comparative analysis are presented to validate the various features and effectiveness of the proposed IOBC for SRM.

Keywords

• Electric vehicle (EV)
• integrated on-board charger (IOBC)
• power factor correction circuit (PFCC)
• interleaved totem pole PFC converter
• switched reluctance machine (SRM)