The increasing penetration of electric vehicles (EVs) imposes rigorous demandson the design of on-board chargers (OBCs), particularly with respect to energy efficiency,power quality, and compliance with harmonic standards. This work investigates advancedPower Factor Correction (PFC) topologies aimed at enhancing the performance of highpower EV OBCs. Specifically, multi-phase interleaved boost converters and interleavedtotem-pole PFC architectures are studied in depth. The paper presents comprehensivemathematical modeling, control design based on Average Current Mode Control (ACMC),and detailed simulation verification. Control strategies are implemented with outer voltageloops and inner current loops, and PI tuning is carried out based on the derived transferfunctions. Simulation in MATLAB/Simulink compares open-loop operation (with highdistortion, low power factor) and closed-loop performance (sinusoidal current, PF > 0.99).Interleaved boost converters with two to four phases are simulated, demonstratingprogressively lower current ripple, THD ≈ 5%, and efficiency up to ~96.8%. Totem-pole andinterleaved totem-pole results show near-unity power factor (0.999), THD approaching 0%,and efficiencies exceeding 99%.