US 11,749,433 B2
Transformers having integrated magnetic structures for power converters
James Sigamani, Pasig (PH); and Jonathan Ross Bernardo Fauni, Quezon (PH)
Assigned to Astec International Limited, Kowloon (HK)
Filed by Astec International Limited, Kowloon (HK)
Filed on Mar. 5, 2019, as Appl. No. 16/293,275.
Prior Publication US 2020/0286670 A1, Sep. 10, 2020
Int. Cl. H01F 27/24 (2006.01); H01F 3/14 (2006.01); H01F 27/28 (2006.01); H02M 3/335 (2006.01); H02M 1/00 (2006.01); H02M 3/00 (2006.01)
CPC H01F 3/14 (2013.01) [H01F 27/24 (2013.01); H01F 27/28 (2013.01); H02M 1/0043 (2021.05); H02M 3/01 (2021.05); H02M 3/33571 (2021.05); H02M 3/33576 (2013.01); H02M 3/003 (2021.05)] 12 Claims
OG exemplary drawing
 
1. A transformer for a multiphase interleaved power converter, the transformer comprising:
a magnetic structure including a top member, a bottom member, a plurality of legs extending between the top member and the bottom member, the plurality of legs including two outer legs, and a middle member positioned between the top member and the bottom member and extending between the two outer legs;
a first set of coils wound about the two outer legs of the magnetic structure between the top member and the middle member and electrically coupled in series; and
a second set of coils wound about the two outer legs of the magnetic structure between the bottom member and the middle member and electrically coupled in series;
wherein the magnetic structure includes a center leg positioned between the two outer legs;
wherein no coil is wound about the center leg; and
wherein magnetic flux generated from the first set of coils is cancelled in a portion of the center leg between the top member and the middle member.