An instantaneous mode switching bidirectional Boost/SEPIC converter for the effective regenerative braking of Electrical Vehicle

There are several bidirectional converters are proposed to integrate batteries, ultracapacitors, fuel cell, electric motors, etc., to control the motoring and regenerative braking effectively in Electrical Vehicle (EV); however, in regenerative braking the braking action is much affected because of a) failure of regenerative braking at lower back emf, and b) discontinuous input current at the motor end. In addition, the traditional BDC are incapable to switch the power flow direction from one to another instantaneously. Therefore, in this paper, we have proposed an instantaneous mode switching bidirectional Boost/SEPIC converter to extract maximum power even under low speed and to switch the power flow direction instantaneously from motoring mode to regenerative braking mode and vice versa. Finally, the computation results of proposed BDC and traditional BDC are compared.