Dear team:
My customer is using totem pole PFC control based on F280049, and he does not understand the following problems:
1, Regarding the output of the voltage loop to the current loop, the marked vBusAvg/vRmsAvg is different from the traditional multiplier. How to understand this multiplication coefficient based on the C2000 voltage control loop;
2, Why are the Bus voltage feedforward, AC voltage feedforward and Boost voltage drop feedforward links added between the current loop output and the assigned duty cycle? If the feedforward link is removed, the current loop cannot achieve close loop control.
Best regards
