an improved sliding mode controller for dc/dc boost converters used in ev battery chargers with robustness against the input voltage variations

An electric vehicle battery charger (evbc) faces serious challenges such as continuous charging voltage ripple, charging speed, input voltage level variations, and its ability to adapt to the battery state of charge (bsoc). a proper controller has an important role to play in preparing for all mentioned above. a nonlinear controller such as a sliding mode controller (smc) is eminently suitable for solving these problems. therefore, this work presents an improved smc for taking the control of a dc/dc boost converter such as an evbc. the proposed controller has a more robust structure when exposed to significant variations of input voltage than the other smcs. therefore, this allows the application of various power supplies as input voltages in evbc stations. the evbc power and battery voltage/capacity in this converter are assumed to be 14 kw and 400v/60ah, respectively. the simulation results in matlab simulink verify the controller’s high performance compared with other smcs.