New topologies of Cuk PFC converter with switched capacitor for low power applications

Power supplies for microelectronic systems, battery chargers, wind energy applications, electric appliances in the household and dc motor drives require AC-DC converters. The proposed bridgeless Cuk PFC converter in this paper is featured with common ground, transformerless structure, and clear energy delivery process. The absence of bridge rectifiers, transformer and the presence of only two semiconductor switches in the current flowing path during each switching cycle result in less conduction losses and improved thermal management, reducing components count, size and cost of the converter compared to the conventional SEPIC and Cuk PFC converters. Moreover, the presence of two power switches for different half cycles leads to less stress on the power switch. Unlike the existing converters, this proposed bridgeless Cuk PFC converter is able to achieve simple control structure with high efficiency, low total harmonic distortion (THD) and high input power factor.