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A Wide Input and Output Voltage Range Battery Charger Using Buck-Boost Power Factor Correction Converter

In both battery operated electric vehicles (EVs) and plug-in-hybrid electric vehicles (PHEVs), a two-stage converter connects the input grid voltage to the battery pack whose voltage varies from 100-500 V, depending on the vehicle size and range. A universal charger, which can address this wide range of battery pack voltages, is suitable for all vehicle architectures. This requirement is achieved by varying the AC/DC converter output voltage using the concept of variable dc link voltage, which is one of the challenges in battery chargers for attaining universal output voltages. This paper mainly focuses on analysis and operating modes for a interleaved boost cascaded-by buck(IBCBB) converter suitable for a power factor correction (PFC) converter. The designed control structure provides a wide degree of control freedom to operate even if the VDC/Vmax (output voltage to peak of Input) less than 0.5. The design considerations for selection of components is also addressed in the paper. Moreover, the proposed converter is validated on the experimental setup and the results are presented in the paper. In addition, a two-stage universal battery charger with wide input and output voltage is been simulated and presented in the paper.