A Novel Switching Scheme for Regenerative Braking and Battery Charging for BLDC motor Drive Used in Electric Vehicle

The development of a simple and cost effective driving system for electric vehicles (EVs) will improve their driving range. But to achieve this objective, the vehicle should be equipped with separate circuits for motor driving, regenerative braking and battery charging which increases the complexity. The paper discusses a novel scheme to reduce this complexity by introducing a switching pattern so as to accomplish these three modes of operation in a Brushless Direct Csurrent (BLDC) motor with the help of a single circuit itself. During motoring mode of operation, the converter acts as a three-phase inverter and for charging operation from the AC grid, the same three phase inverter acts as a rectifier which is connected to a buck converter by properly changing the switching pattern. Further, during regenerative braking mode, the same converter itself acts as a boost converter and feeds power back to the supply side. The simulation results presented in the paper prove the effectiveness of the proposed scheme.