US 12,113,435 B2
Active-clamp forward converter with regenerative snubber
Philipp Rehlaender, Paderborn (DE); Bastian Korthauer, Zürich (CH); Frank Schafmeister, Warburg (DE); and Joachim Böcker, Berlin (DE)
Assigned to Delta Electronics (Thailand) Public Co., Ltd., Samutprakarn (TH)
Filed by Delta Electronics (Thailand) Public Co., Ltd., Samutprakarn (TH)
Filed on Jun. 9, 2022, as Appl. No. 17/806,261.
Claims priority of application No. 21178635 (EP), filed on Jun. 9, 2021.
Prior Publication US 2022/0399804 A1, Dec. 15, 2022
Int. Cl. H02M 3/335 (2006.01); H02M 1/34 (2007.01); H02M 3/00 (2006.01)
CPC H02M 1/342 (2021.05) [H02M 3/01 (2021.05); H02M 3/33571 (2021.05); H02M 3/33592 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A power converter-circuit having a transformer, comprising:
a snubber-circuit for suppressing voltage peaks on a secondary side of the transformer that comprises a snubber capacitor; and
an auxiliary DC-DC converter having a first input connected with the snubber capacitor and a first output connected with a first output of the power converter-circuit;
wherein the auxiliary DC-DC converter is a multiphase buck converter in which a number of n buck converter circuits are placed in parallel between an input and an output of the auxiliary DC-DC converter, and wherein a phase of each of the n buck converters is turned on at equally spaced intervals over a switching period.