Doubt about pfc in smps

PFC is only meant to improve power factor. From an AC power distribution system perspective, having a load with a high PF improves the efficiency of power transmission. However, this transmission efficiency is completely independent of the energy efficiency of the PFC itself. Whether the PFC performs better in terms of EMI or efficiency depends on what you are specifically comparing.

Hey! Here is two links about SMPS where is well explained. Check it out!

https://en.wikipedia.org/wiki/Switched-mode_power_supply

https://www.onsemi.com/pub/Collateral/AND8428-D.PDF