This paper presents a high gain buck PFC synchronous rectifier which offers a high efficiency rectification and high quality waveforms. The Z-source network applied to the rectifier, helps to highly increase the quality of input current of the conventional rectifier. The input inductor of this Z-source network provides smooth and pure sine waveform for the AC source current. In addition, applying this Z-source network allows to decrease the high AC input voltage to a very low output voltage required for low voltage loads such as LED drivers. Also, the synchronous buck rectifier utilization with the simple average current control (ACC) method offers less power losses compared to conventional buck rectifier, in addition to less control complexity. The steady state operations of the proposed PFC rectifier are theoretically derived and analyzed. Then, the concept and the supremacy of the proposed PFC rectifier are verified through a set of simulations for a 48Vdc/500W rectifier.

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