Because of the continuous input current and small electromagnetic interference, conventional voltage doubler Boost PFC converter has been widely applied as the front-end stage of half-birdge inverter. Through the analysis of conventional voltage doubler Boost PFC converter’s operating principle, the conventional converter is not taking full advantage of its switches and inductances. Thus, a modified voltage doubler Boost PFC is presented this paper aiming to make use of the switch and inductance; besides, digital control technology is introduced to this modified converter. The experimental results based on TMS320F2808 show that the modified converter is simple、reliable and can realize steady output bus voltage in total power with high input power factor and low THD.