A PFC BASED EV BATTERY CHARGER USING A BRIDGELESS ISOLATED SEPIC CONVERTER

Abstract

Conventional PFC (Power Factor Correction) circuits in EV (Electric Vehicle) battery chargers have the efficiency limitation due to high conduction loss associated with a diode bridge rectifier (DBR) at the input. To mitigate this issue, a bridgeless (BL) single ended primary inductance converter (SEPIC) with improved power quality, is proposes in this project. The input current shows a unity power factor operation over the entire charging duration. Due to elimination of DBR and the current conduction through relatively fewer numbers of devices, conduction losses are significantly reduced. This, in turn, improvises the charger efficiency as compared to conventional BL SEPIC converter. The overall performance of proposed charger is illustrated with the help of various operating modes, design equations, simulation based performance and experimental validation under steady state as well as over wide fluctuations in AC mains voltage. The EV battery is charged at constant current/ constant voltage control mode, which provides satisfactory results for improved efficiency and inherent PFC, thus, improving overall performance of the charger.

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