Abstract

The segment of onboard chargers (OBCs) is dominated by two-stage charger topologies, which have several disadvantages like bulky size and less efficiency in view of high component count, high cost and complex controller design. To overcome these disadvantages, an isolated bridgeless version of modified SEPIC converter is used to develop a single-stage high power factor battery charger for light electric vehicles (LEVs) in this study. Apart from the advantages of high power factor operation, continuous input and output currents, and high voltage conversion ratio, the modified SEPIC converter based charger is designed to reduce the voltage stress on the power switches in the converter circuit. The presented charger operates in discontinuous conduction mode (DCM), which endows it with several advantageous features such as innate power factor correction (PFC) capability, concession in control effort, decrease in size of magnetic components and reduction in sensor count leading to discount in overall cost of implementation. The paper attempts to elucidate the operation of the charger, design of charger components, design of control algorithm and performance validation of the designed components and control logic by means of simulations. Viability of 48 V LEV battery charging under constant current (CC) mode is explored in this study for a 500W rated charger.

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