Multi-Purpose Design of Optimized Current Controller for Bridgeless Totem-Pole Power Factor Correction Converters

This research aims to design a control strategy for the conventional silicon-carbide (SiC)-based totem-pole bridgeless power factor correction (TPBPFC) converter which covers power quality requirements and the improved performance of the converter. An optimized adaptive hysteretic band of the current controller to increase the efficiency and meet reliability and safe operation of the inductor far from the saturation area is developed. The improved efficiency is realized using a hybrid approach: negative conduction mode (NCM), continuous conduction mode (CCM), and a band-adaptable hysteresis controller. Soft-switching conditions for all power switches in NCM and lower conduction losses in CCM are optimally achieved. Minimized total losses of the converter, the inductor's safe operation far from the saturation area, and the improved reliability of the converter are obtained simultaneously. A 1.2 kW SiC-based TPBPFC prototype is finally tested for vivificating the proposed strategies. The efficiency of the converter at 20% rated power is more than 98.4%, and the maximum efficiency obtained is 99.1%. The power factor is above 0.99 at maximum load, and the input current's total harmonic distortion (THD) is below 3%. In addition, the suggested approach has exceptional thermal properties under typical heat dissipation settings, as demonstrated by the thermal test.