Transformerless high voltage and controllable current battery charger for e-car

Charger is an important part in e-car. For a massive number of e-cars in the future, battery charger should have characteristics of high efficiency, rapid charging capability, portability, low-cost and compatible with the national standar electricity. In order to cover thus five parameters, the battery charger design should be transformerless, employing buck swith converting method, and having a microprocessor to monitor and control charging voltage and current during charging process. In this paper, we do simulation and experiment with a battery charger prototype, where the input is 220V-50Hz (PLN) and transformerless. To control the charging voltage and current output of buck switch converter, we use a microprocessor circuit. The charging voltage and current of the battery charger are 36-96V DC and 0 s/d 20 A, respectively.