Figure 5. Digital Pfc Implementation Scheme; Figure 6. Block Diagram Of The Voltage And Current Pi Regulator - ST STM32F103ZE User Manual

PFC basics and operating principles
Figure 5.
Note: The power section is composed of the STEVAL-ISF002V1 (covered in this user manual).
The control section is composed of the STEVAL-IHM022V1 (covered in UM0686).
Figure 6.
By means of a "voltage error compensator" it is possible to follow the target of the output
voltage. Moreover, its output is used as a scaling factor for the Vac, the latter used as the
current reference input for the "current error compensator". The output of this last PI is the
actual duty cycle of the PFC power MOSFET.
10/62
www.BDTIC.com/ST
Digital PFC implementation scheme
Block diagram of the voltage and current PI regulator
Doc ID 16854 Rev 1
UM0877