In this paper, electric vehicle (EV) system using bi-directional DC-DC converter which can control the type of low-voltage and high-current battery is proposed. Proposed system uses isolated DC-DC converter for voltage compensation. The proposed topology has a form in which the inputs are connected in parallel and the outputs are connected in series in battery and isolated converters. The basic concept of dc-dc converter is integrated boost-flyback converter. This converter has the advantage of high step-up voltage by boost converter and system isolation by flyback converter. The motor driving mode for the EV can be divided into two such as motoring mode and regenerative braking mode. In the EV system, the regenerative braking control is used during deceleration. The simulation of motoring and regenerative braking mode using proposed system is performed and the result, verify the proposed control method. Index Terms--ElectricVehicle (EV), Integrated Boost-Flyback Converter, Low-Voltage and High-Current Type Battery, IPMSM Control.

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FCEV (Fuel cell electric vehicle) is provided with energy for operating the motor from the fuel cell. But fuel cell is impossible to be charged at the regenerative mode and also, it has slow dynamic characteristics. So, additional battery is essential as an auxiliary power source in FCEV system. The output current of the VSI (Voltage Source Inverter) is distorted due to the dead-time and the delay time of switching devices [I]. The ripple of the output current is proportional to the DC-link voltage. So, variable DC-Link control is required to alleviate this problem. In this paper, the bi-directional DC DC converter controlling variable DC-link is proposed. The proposed converter controls DC-link both motoring and regenerative mode. Also, it chooses the source from among the battery and fuel cell corresponding to the motor speed. The operating modes of converter at motoring and regeneration are presented. Finally, simulation results are presented to verify the reliability of proposed bi-directional converter.