A novel digital boundary current control AC-DC converter

The purpose of this paper is to present a new digital control boundary current mode ac-dc converter without a current detector. The ac-dc converter is widely used as power factor correction. The ac-dc converter that operates in a boundary current mode has the some advantages. It has capability to achieve low current distortion. The unity power factor is theoretically obtained by the boundary current mode control. In the proposed method, a nonlinear equation is solved using Newton´s method to predict the zero-cross point of the inductor current. In this paper, simulation results are shown on the assumption that the CPU is being used.