US 12,438,449 B2
Power factor correction system, controller and method of controlling a power factor correction system
Andrey Malinin, Fort Collins, CO (US); and Renato Bessegato, Oberhaching (DE)
Assigned to Infineon Technologies Austria AG, Villach (AT)
Filed by Infineon Technologies Austria AG, Villach (AT)
Filed on May 16, 2023, as Appl. No. 18/318,082.
Prior Publication US 2024/0388198 A1, Nov. 21, 2024
Int. Cl. H02M 1/42 (2007.01); H02M 1/00 (2006.01)
CPC H02M 1/4233 (2013.01) [H02M 1/0043 (2021.05); H02M 1/4208 (2013.01); H02M 1/4225 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for controlling a PFC (power factor correction) system having a plurality of phases, the method comprising:
operating the plurality of phases under variable frequency control to interleave current delivered by the plurality of phases to a load;
during a switching cycle for the plurality of phases, activating a phase synchronization correction indicator if a predetermined crossing point along a rising or falling slope of the current delivered by a second phase of the plurality of phases is misaligned with the same predetermined crossing point along the opposite slope of the current delivered by a first phase of the plurality of phases; and
during the next switching cycle, adjusting a switching period of the second phase if the phase synchronization correction indicator was activated during the previous switching cycle.