The proposed PFC-based bridgeless isolated Cuk
converter is designed to operate in discontinuous inductor current mode to
achieve an inherent PFC at the ac mains. The proposed drive is controlled using
a single voltage sensor to develop a cost-effective solution. The proposed
drive is implemented to achieve a unity power factor at the ac mains for a wide
range of speed control and supply voltages. An improved power quality is
achieved at ac mains.
Working principle:
A
Ćuk converter transforms a DC voltage at the input to a DC voltage at the
output with reversed polarity. Compared to the Buck, Boost and Buck-Boostconverters the Ćuk converter
uses an additional inductor and capacitor to store energy. Consider the
following sequence of the MOSFET conduction state
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