A high capacity synchronous buck converter for highly efficient and lightweight charger of electric easy bikes

For simple structure and lower maintenance cost, electric vehicles are popular in this sub-continent. As passenger vehicles, easy bikes are being widely used in Bangladesh. Mainly, iron core transformer based bulky chargers with efficiency lower than 80% are used to charge more than 10 million easy bikes. These inefficient chargers cause huge power losses to national utility grid. Moreover, manual controls of such conventional charger are bothersome to its user. Implementations of power electronics based chargers are able to operate in more than 90% efficiency which can reduce the power losses from utility grid. A high capacity synchronous buck converter based charger with built in intelligent system is proposed in this paper. An automated charging current control system is initiated. After the simulation by using PSIM software, a lightweight prototype of easy bike charger is built and its performance is evaluated for high output current. The efficiency and its maximum rated power is observed and compared with the conventional charger.