Improvement of input side currents of a three phase rectifier using Cúk converter in discontinuous-capacitor-voltage mode operation

The characteristics of Cuk converters in discontinuous-capacitor-voltage mode are studied. A Cuk converter in this mode of operation is an inherent power factor corrector and features soft turn of switching. This paper proposes a Cuk converter in discontinuous-capacitor-voltage mode (DCVM) operation in order to reduce the total harmonic distortion (THD) of a three-phase rectifier. In the proposed circuit pulse width modulation (PWM) is used to regulate the output voltage. A small series LC filter is used at the input side to suppress the low frequency harmonics components that may pass to the input. Some simulation results are presented. The variation of output voltage, THD of input current and power factor with duty cycle of the proposed converter circuit are also presented in this paper.