Bidirectional IGBT-based Battery Fast Charger

This paper presents the development of a three-phase fast charger for electric vehicle batteries. Nominally this charger is designed to deliver up to 50kW and 100A nominal to the battery. The first charging stage consists of an AC/DC converter coupled to an LCL filter and connected to the power grid at 220V Phase-Phase. The second stage consists of a DC/DC interleaved converter, which is connected to the DC bus at 500V. The charger is coupled to the battery in order to validate charging through the CC-CV method (Constant Current - Constant Voltage). The operation of the converter and its control technique are validated through simulations in the Matlab software, using the Simulink tool. Then, the charger is built physically using the first stage AC/DC and its operation is demonstrated using a bank of batteries. The control strategy is implemented in the DSP TMS320F28379D. Satisfactory results were obtained in the battery charging control. Although the practical implementation is done on a reduced scale, the control system can be easily used at higher powers, just with adjustments in the control gains. The importance of compensating the dead-times that appear in the practical part is highlighted.