A novel interleaved single-stage AC/DC converter with high power factor and ZVS characteristic

A novel single-stage AC/DC converter is proposed here, which is integrated by an interleaving cell and LLC cell. Because the components of system are reduced by integrating, the cost decreases. And since interleaving technology is adopted, the converter can work in high voltage input state. And LLC resonant converter chosen here makes sure that the switches in the primary side can work in zero-voltage-switching (ZVS) condition and the diodes in the secondary side can work in zero-current-switching (ZCS) condition, which decreases the switching loss of the system, a 100W prototype is proposed, throughout the experiment, the power factor(PF) of the converter is as high as 0.99, the total harmonics distortion(THD) is lower than 10%, and the efficiency is as high as 91.1%.