Design and Implementation of Bridgeless SEPIC Rectifier for Power Factor Correction

A Bridgeless SEPIC rectifier for power factor correction with low conduction losses and load regulation is proposed. The proposed SEPIC rectifier can achieve low conduction losses by provides two semiconductor switches at any time of conduction. This Sepic will act in DCM mode. The DCM operation gives additional advantages such as, zero-current turn-off; zero-current turn-on in the power switches in the output diode and reduces the complexity of the control circuitry .The output to input relation is controlled by PI controller. The proportional controller checks the error between actual and reference voltage. The integral controller will compensate this error by comparing the error with repeated sequence.DCM is preferred to produce almost unity power factor. At any time of voltage regulation line side power factor is maintained.