Development of Modified Type-C DC-DC Converter for Efficient Charging and Discharging of EV Battery Using PI-Controller

The IC engine vehicles run by the fossil fuel not only has a great impact on the existing environment but also the availability of the fossil fuel is one of the biggest issues. So, the development of electric vehicles (EVs) runs by battery is increasing rapidly. The battery charging system is also significantly improving. The government policies by offering subsidies and other facilities will encourage the citizens to purchase the EVs. A modified Type-C DC-DC converter has been studied in charging mode as well discharging mode through a load and the gate triggering circuit for mosfets are controlled by PI-controller. The gain of proportional and integral controller has been chosen by trial-and-error method. The charging current reaches the steady state value at 0.43 s with a damping constant 0.3754. But the current and voltage wave form is found pulsated because of periodically ON and OFF the mosfet-1 in order to maintain a constant current operation. The values are verified with Ziegler-Nichols (Z-N) and Cohen-Coon methods those need the time to reach the steady state value and damping constant are found 184 s and 0.8261 and 157 s and 0.8177, respectively. Though circuit current reaches the steady state value earlier than that by using Z-N and Cohen-Coon methods but it is pulsated. At the present time, the design of the bidirectional charging system and also optimal charging and/discharging scheduling of EV batteries are the most insignificant area of research work.