US 11,862,389 B1
Magnetic devices for power converters with light load enhancers
Alexandr Ikriannikov, Castro Valley, CA (US); and Anthony J. Stratakos, Kentfield, CA (US)
Assigned to VOLTERRA SEMICONDUCTOR LLC, San Jose, CA (US)
Filed by VOLTERRA SEMICONDUCTOR LLC, San Jose, CA (US)
Filed on Jul. 12, 2021, as Appl. No. 17/373,575.
Application 17/373,575 is a division of application No. 16/360,612, filed on Mar. 21, 2019, granted, now 11,062,830.
Application 16/360,612 is a division of application No. 15/632,660, filed on Jun. 26, 2017, abandoned.
Application 15/632,660 is a division of application No. 14/537,263, filed on Nov. 10, 2014, granted, now 9,691,538, issued on Jun. 27, 2017.
Application 14/537,263 is a continuation in part of application No. 13/599,677, filed on Aug. 30, 2012, abandoned.
Int. Cl. H01F 27/28 (2006.01); H01F 3/10 (2006.01); H01F 27/38 (2006.01); H02M 1/44 (2007.01); H02M 3/155 (2006.01); H01F 38/08 (2006.01); H01F 38/02 (2006.01); H02M 1/00 (2006.01)
CPC H01F 3/10 (2013.01) [H01F 27/38 (2013.01); H01F 38/08 (2013.01); H02M 1/44 (2013.01); H02M 3/155 (2013.01); H01F 2038/026 (2013.01); H02M 1/0032 (2021.05); Y02B 70/10 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A magnetic device, comprising:
a plurality of magnetic film layers forming a magnetic core,
one or more of the magnetic film layers having:
(a) a plurality of first windings around a plurality of respective first axes in the magnetic core, the plurality of first windings enclosing a plurality of respective first areas, wherein a first space exists between each winding of the plurality of first windings in a horizontal dimension; and
(b) a second winding around a second axis, the second winding enclosing the plurality of first windings, wherein a second space exists between the plurality of first windings and the second winding,
wherein the first and second spaces comprise material with a smaller magnetic permeability than the magnetic core.