Closed Loop Modular Topology to Interface Removable Batteries in an Electric Powertrain With 400 V and 800 V Compatibility

Abstract

To improve the adaptability of electric vehicle (EV) energy management, the inclusion of a removable battery is identified as an alternative method. This option is compatible with both the extensively used 400 V bus standard and the emerging 800 V standard. This paper introduces a flexible topology capable of linking a removable battery to both the 400 V and 800 V buses. The modular topology is based on two DABs connected in Input Parallel Output Series (IPOS) connection, adapting to the possible standard buses without external switches. The primary focus of the research is on the control loops needed to regulate the power supplied by the removable battery to the DC bus. Simulation and experimental results validate the effectiveness of the designed controllers under stability criteria.