GaN Based Modified Integrated On-Board Charger Configuration Using Minimum Additional Active and Passive Components

In this paper, a GaN based modified non-isolated integrated on-board charger (IOBC) using a low value zero sequence inductance of traction motor and an inverter for class A and B segment electric vehicles (EV's) with dual power conversion stages is proposed. In the modified configuration, the traction motor and the inverter will be used as components in the back-end DC to DC buck converter instead of in the front-end AC to DC boost converter as available in the conventional IOBC configuration. The modified IOBC configuration satisfies the permissible THD distortion limit of the Japanese utility companies and also keep the output peak-to-peak battery current ripple within the specified limits. Furthermore, electrical safety issues such as touch currents due to the presence of ground leakage currents caused by the low common-mode impedance of the non-isolated IOBC are solved by adding a split boost inductor and a floating EMI filter in the proposed modified IOBC configuration. The feasibility of the modified IOBC configuration and the solutions for the safety issues are verified from suitable simulation and experimental results.