US 11,942,785 B2
Power-electronic device comprising a transformer unit and method
Sebastian Umlauf, Kassel (DE)
Assigned to SMA Solar Technology AG, Niestetal (DE)
Filed by SMA Solar Technology AG, Niestetal (DE)
Filed on Oct. 21, 2020, as Appl. No. 17/076,084.
Application 17/076,084 is a continuation of application No. PCT/EP2019/059571, filed on Apr. 12, 2019.
Claims priority of application No. 10 2018 109 868.5 (DE), filed on Apr. 24, 2018.
Prior Publication US 2021/0035727 A1, Feb. 4, 2021
Int. Cl. H02M 7/44 (2006.01); H01F 27/26 (2006.01); H01F 27/28 (2006.01); H01F 27/40 (2006.01); H02J 3/01 (2006.01); H02J 3/24 (2006.01); H02J 3/26 (2006.01); H02J 3/38 (2006.01); H02J 3/36 (2006.01)
CPC H02J 3/01 (2013.01) [H01F 27/26 (2013.01); H01F 27/28 (2013.01); H01F 27/40 (2013.01); H02J 3/241 (2020.01); H02J 3/26 (2013.01); H02J 3/38 (2013.01); H02M 7/44 (2013.01); H02J 3/36 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A power electronics device comprising at least two inverters and a transformer apparatus, wherein:
the inverters are electrically connected on an AC side thereof to the transformer apparatus on a primary side thereof, and the transformer apparatus is configured to be electrically connected on a secondary side thereof to a power distribution grid,
the transformer apparatus comprises a core arrangement, and at least one primary winding and at least one secondary winding that wind around the core arrangement at least in sections,
the core arrangement comprises at least two rows of core limbs arranged adjacent to one another, wherein the core limbs are connected to one another via yoke connections in each row, wherein:
at least one special electrical connection is present between a phase output of an inverter and a primary winding start of a primary winding of the transformer apparatus, wherein the following applies to such a special electrical connection:
the primary winding start of the primary winding is electrically connected to exactly one phase output of one of the inverters and the primary winding is essentially wound around a core section, adjoining a first core window, of a row,
and at least one second primary winding, electrically connected to at least one of the inverters, of the same phase is essentially wound around a core section adjoining a second core window of another row, which core section is spaced from the first core window, wherein a secondary winding of the same phase is wound in sections around a core section adjoining the first core window and around a core section adjoining the second core window.