Mode change method of bi-directional DC/DC converter for electric vehicle

In this paper, a mode change method is proposed to charge and discharge a battery safely which is the main energy source of electric vehicle. To verify the proposed mode change method, a simulation is performed with a bi-directional converter of a multi-phase which is using vehicle system. The three phase interleaved bi directional DC/DC converter performs average current control for each phase inductor current. And the proposed mode change method is applied for the operation from step up(boost) to step-down(buck). The mode change method is proposed that can be limited overshoot current for transition and improving a dynamic current characteristic. To confirm the validity of the proposed method, its operation and performance are verified through a simulation and experiment with inverter for IPMSM.