SINGLE-PHASE PFC CONVERTER WITH ACTIVE POWER DECOUPLING CIRCUIT FOR ON-BOARD EV CHARGERS

This thesis presents the design and simulation of a 2 kW single-phase totempole power factor correction (PFC) converter integrated with an active power decoupling (APD) circuit for on-board electric vehicle (EV) chargers. A peak currentmode (PCM) control method, originally developed for boost-type PFC converters, is adapted for the first time to the totem-pole topology. To adapt the PCM controller to the totem-pole converter, three sensing methods are proposed and evaluated. All methods achieved effective current shaping with a total harmonic distortion (THD) of approximately 4.4%. The inductor current sensing method demonstrated a fast dynamic response and reduced hardware complexity. To mitigate the limitations of conventional DC-bus capacitors for the totem-pole converter in on-board EV charging applications, bidirectional Buck and Buck-boost APD topologies are integrated and assessed. Simulation results show that both APD circuits reduce output voltage ripple to ±1% using only 17% of the conventional capacitance, enabling the use of long-life film capacitors and potentially extending system lifespan by up to 50 times. While the Bucktype APD cell offers lower voltage and current stress, the Buck-boost topology provides enhanced flexibility in voltage regulation. These findings support the development of compact, efficient, and reliable on-board EV charging systems.