Abstract
A bridgeless single-phase AC to DC Power Factor Correction (PFC) rectifiers based on CUK topology is discussed in this paper. Compared to the conventional converter the bridgeless circuit lack the input diode bridge. Only two semiconductors is working during one switching cycle and hence the conduction losses are minimised. CUK PFC rectifier is designed to work in Discontinuous Conduction Mode (DCM) to achieve almost a unity power factor and low total harmonic distortion of the input current. The DCM operation gives additional advantages such as zero-current turn-ON in the power switches, zero-current turn-OFF in the output diode, and simple control circuitry. Bridgeless circuit performance is analysed through simulation. In this paper simulation of the bridgeless CUK rectifier for output regulation is done. The voltage mode control loop compares the actual output voltage with the reference voltage of 40V to maintain the output constant at this value. A conventional fuzzy controller is used in this control loop which provides good regulation.
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