Switched-Capacitor Based Bridgeless Totem-Pole PFC Converter for EV Applications

This paper presents a hybrid totem-pole (TTPL) PFC AC-DC converter that utilises a switched-capacitor (SC) cell for electric vehicle (EV) charging applications. The converter has the capability to function as a component of an OBC system, specifically for LV battery charging. It is suitable as a front-end converter for ratings up to 3.3 kW. Conventional boost PFCs exhibit a restricted ability to deliver a lower DC output than the input AC magnitude. The use of an additional stage to obtain lower DC outputs results in an increased number of components, decreased efficiency, and lower power density. The addition of an SC-cell with the highly efficient TTPL PFC configuration is used to address the issue of obtaining low output. A comprehensive analysis of the operational modes, accompanied by a detailed exposition of the design methodology, is presented. A 1 k W prototype of the converter design has been simulated and developed. The results indicate that the converter can function within a broad input voltage range of 90–270 $V$ AC and maintain an input current THD that falls within the limits specified by IEC61000-3-2.