An Integrated On-Board EV Charger with Safe Charging Operation for Three-Phase IPM Motor

This paper presents a safe charging operation for the integrated on-board electric vehicle (EV) charging system, where the power electronic components are reconfigured from the propulsive system. First, the rotational movement is detected and analyzed, when the motor windings are reutilized as the dc-dc inductors. Then the safe charging operation is investigated, which is based on the analysis of the charging torque and the ripple currents. Moreover, a new control strategy is presented with the purpose of the safe operation and smoothing reactor during the EV charging process. Finally, both simulation and experimentation are carried out to verify the safe charging operation. The results prove the feasibility and validity of the proposed safe charging operation for on-board charger with the three-phase interior permanent-magnet motor.

I. Introduction

The main challenges of wide usage of electric vehicle (EV) now are the high cost and the limited range [1], [2]. Although the off-board charger can provide safe and fast charging capability, the geographical density of the off-board charger is relatively low. Also, it needs to occupy the precious land resources in modern cities [3], [4]. Thus, in these situations, the integrated on-board EV charger is a promising supplement over the off-board charger. Also, the integrated on-board charger can greatly save the cost by reutilizing the vehicular devices. Furthermore, it can offer more space for allocating the battery pack in order to extend the endurance mileage [5], [6].