An efficient topology for electric vehicle battery charging

Abstract

A choice of logical converter topology plays a notable role in the battery charging of electric vehicles (EVs). In this paper, snubber less stage of rectifier cascaded with snubber less stage of the dc-dc converter is proposed in which stage I eliminates the need of front-end rectifier, and no further circuitry is required for switching operation of rectifier stage. Due to pulse width modulation (PWM) switches share the same gating signal for positive as well as negative cycle operation. Second stage converter uses asymmetrical pulse width modulation (APWM) technique in which zero voltage switching (ZVS) is achieved for all active switches, and near zero current switching (ZCS) for low side, active switches are attained during the charging range of the battery. The size of auxiliary inductance required is decreased for ZVS with APWM compared to previously proposed APWM with snubber circuitry. Due to a reduction in the size of auxiliary inductor and absence of snubber circuit results in an efficient battery charger topology. The MATLAB simulation is done of the proposed converter to validate the results.