Special Issue Article
A Non-Linear Controller Based On Discrete Energy Function for An AC/DC SEPIC PFC Converter
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In this paper a new bridgeless SEPIC single phase ac-dc power factor correction(PFC) rectifier is presented.A bridgeless SEPIC rectifier for power factor correction with low conduction losses and load regulation is presented.The absence of an input diode bridge and it can achieve low conduction losses by provides two semiconductor switches at any time of conduction.This SEPIC will act in DCM(Discontinuous conduction mode) mode to achieve almost unity power factor in a simple and effective manner. The DCM operation gives additional advantages such as, zero-current turn-on, zero – current turn-off, and reduces the complexity of the control circuitry. In this paper PI controller is used. 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.