Abstract
This paper addresses control techniques aimed at improving light-load efficiency and reducing harmonic distortion in digitally controlled single-phase boost power factor correction (PFC) rectifiers. Based on a discontinuous conduction mode (DCM) detection circuit, it is shown how an extension to the predictive current control law leads to improved current regulation over wide load range in both continuous conduction mode (CCM) and in DCM. Furthermore, adaptive switching and adaptive switching frequency techniques are introduced to reduce switching losses and improve efficiency at light loads. Experimental results are shown for a 300 W boost PFC rectifier.
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