Abstract:
A new topology of single-phase Ĉuk ac-dc converter with low input current THD and high
input power factor has been proposed and studied. The input to the converter is ac and the
rectifier’s input is chopped at high frequency during positive and negative cycles by a bidirectional
switch in Ĉuk conversion mode to get step-up/step-down ac-dc conversion. For
the proposed topology, the Total Harmonic Distortion of the input current has been found to
be less than10% and input power factor is more than 0.7. The efficiency of the proposed
circuit has been found to be higher than 70%. The obtained voltage gain is found to be step
down for duty cycle lower than 0.5 while that for duty cycle higher than 0.5 is step up in
nature. Moreover, the proposed topology has been studied for different types of load circuits.
