A duty cycle generation scheme for the three-phase single-stage full-bridge PFC in balanced-grid

In this Letter, the duty cycle generation scheme is presented and implemented, which can improve the input performances of the three-phase single-stage full-bridge power factor correction (PFC) converter. The analysis and discussion is aiming at the operation of the PFC converter in balanced grid condition. On the basis of the instantaneous expression of the three-phase input current, the ideal duty cycle of each phase is obtained. To achieve a good PF for each phase, a simplified duty cycle generation scheme is presented and implemented in the three-phase PFC converter. The simulating and experimental results based on a 500 W prototype show that after adoption of the presented duty cycle generation scheme, a higher PF has been achieved for each phase of the three-phase PFC converter.