Modeling and simulation of single phase PFC controller based on DSP

LIU Miao， HE Nan-nan， MEI Shen-hua
（Shenzhen Machinery Institure Architectural Design Co.，Ltd.， Shenzhen 518027， China）

Abstract：In order to reduce the harmonic pollution caused by power electronic devices，adding a power factor correction （PFC） circuit in the front end of the power supply of electric device is a mainly means. The double closed loop PFC digital control system，with Boost converter as mainly topological structure was discussed. According to the circuital principle of equal effects，the equivalent circuit model of Boost converter was established under the average circuit mode，and alternating current small semaphore was separated from the direct semaphore using small-signal analysis method，and finally the Boost circuital small signal model was established. On this basis，with the bandwidth and phase margin of closed-loop system as the index，the PI regulator of the control system was designed by using Bode diagram method. Finally，the simulation test was done with Saber.The results show that the control system model can effectively control PF value in more than 99%，THD will be reduced to less than 5%，has achieved the desired control effect.
Key words：power factor correction（PFC）； PI regulator； Saber simulation； digital signal processing（DSP）