Electrical vehicle charge unit design with full bridge DC-DC converter fed by PFC CUK converter

Recently, the use of electrical vehicle has been increasing due to reduction of carbon-based fuel and its negative effect to the nature. Also, required energy for electrical vehicle is supplied by battery. This thesis study includes the simulation and low power transfer application of a Li/Ion battery charger with full bridge DC-DC converter for electric vehicles. The connection of the full-bridge converter to the single-phase grid is made using the PFC Cuk converter with hysteresis current control. To reduce grid current THD and to increase PF, hysteresis current control is applied to PFC Cuk converter. Cuk converter is selected because it provides lower or higher voltage at output with respect to input and it has input, output inductors reducing current ripple. Therefore, in the thesis, first of all, the mathematical model of the full-bridge DC-DC converter, small signal analysis and transfer function are obtained. In application, high frequency transformer and circuit designs are carried out. Also, the inductor at the output of the converter is operated in discontinuous conduction mode (DCM). The simulation of the study is carried out using the Matlab/Simulink program. With the simulation, battery current, voltage and SOC values are measured to verify that the battery is charging. THD of grid current and PF are also observed. As a result, the Li/Ion battery is charged as desired. The PF is increased and is obtained as 0.999, THD of grid current is reduced and is obtained as 1.48%. However, in the applications, because the maximum voltage on the semiconductor switches is not reduced as desired, battery charge is realized with low power and at low voltage.