A new single switch bridgeless SEPIC PFC converter with low cost, low THD and high PF

In this paper, a new single switch bridgeless AC/DC power factor correction PFC converter topology to achieve high PF and low THD is proposed. The proposed converter is based on the single ended primary inductance converter SEPIC topology. The SEPIC converters can operating from an input voltage that is greater or less than the output voltage. The proposed PFC uses only one active switch to PFC process together hoping higher PF and low THD. Besides the application cost is less than conventional bridgeless SEPIC PFC, in where two active switching devices are necessary. In order to verify the performance comparison between the proposed and the conventional SEPIC PFC, simulation circuit with 100W is install in PSIM. The simulation results are presented to demonstrate the feasibility of the proposed converters. The results show that the proposed bridgeless SEPIC PFC perfectly succeeds PFC operation using a single active switch.