Design and Implementation of a Buck-Boost Converter for Power Factor Correction in Plug-In Electric Vehicle Battery Chargers.

The design and implementation of a Buck-Boost Converter for Power Factor Correction (PFC) in Plug-In Electric Vehicle (PEV) battery chargers has demonstrated an effective solution for improving both power quality and charging efficiency. The proposed converter successfully combines voltage regu-lation and power factor correction in a single-stage topology, allowing the charger to maintain a stable DC output while drawing a nearly sinusoidal input current from the AC supply. This significantly reduces harmonic distortion and ensures compliance with international power quality standards such as IEEE 519 and International Electrotechnical Commission IEC 61000-3-2. The Buck-Boost topology proved particularly suitable for electric vehicle charging applications because of its ability to operate in both step-up and step-down modes. This fea-ture enables the charger to accommodate wide variations in input voltage and battery voltage during different charg-ing stages. The converter maintained a high power factor, typically above 0.98, and achieved efficient energy transfer with reduced switching and conduction losses. The control strategy effectively regulated the duty cycle, ensuring accurate output voltage control and stable operation under dynamic load conditions.

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