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This study simultaneously realized fast charger and low charger for electric vehicles by designing the driving power supply for the synchronization and interface of the battery system and power converter equipment of electric vehicles. In addition, it allowed the power of the output voltage and current to be supplied at a rate that is freely determined by user's setting regardless of the type of battery and power source, and also the charge and discharge devices for electric vehicles were developed using DSP. Furthermore, multi-step charging and discharging functions according to the changes in C-rate and CC (Constant Current) and CV (Constant Voltage) charging functions were realized in which the system can stably and continuously be operated with efficiency of 95% or above. Through such technological development, it has become possible to freely adjust the input voltage and output voltage according to the load condition through which production cost can be reduced and it is expected that it could be utilized in controller businesses for establishment of emergency power supply in the fields of multiple power supply apparatus of next generation electric vehicles and alternative energy that are leading the future green growth. In the future, this can be utilized in On Board Charger and Off Board Charger of EREV (Electric Range Extender Vehicle) in addition to being possible to be used in development of SMPS for power supply of high capacity power converter. It seems that it can be manufactured as product through design of DC/AC converter for next generation electric vehicles.