US 11,699,956 B2
Cycle-by-cycle reverse current limiting in ACF converters
Claudio Adragna, Monza (IT); and Francesco Ferrazza, Milan (IT)
Assigned to STMicroelectronios S.r.l., Agrate Brianza (IT)
Filed by STMicroelectronics S.r.I., Agrate Brianza (IT)
Filed on Nov. 18, 2022, as Appl. No. 17/989,877.
Application 17/989,877 is a continuation of application No. 17/523,651, filed on Nov. 10, 2021, granted, now 11,552,573.
Prior Publication US 2023/0141001 A1, May 11, 2023
Int. Cl. H02M 3/335 (2006.01); H02M 1/08 (2006.01)
CPC H02M 3/33569 (2013.01) [H02M 1/08 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for operating an active-clamp flyback (ACF) converter, the method comprising:
generating a forward current through a primary winding of a transformer for a first duration;
generating a reverse current opposite the forward current through the primary winding for a second duration at an ending of the first duration, wherein an ending of the second duration corresponds to detecting an overcurrent condition at the reverse current or elapsing of a set time duration; and
stopping the generating of the reverse current for a third duration in response to not detecting an overcurrent condition at the reverse current, the third duration being equal to the set time duration and being after the second duration.