US 12,451,815 B2
Voltage transformer
Levy Ferreira Costa, Wettingen AG (CH); and Marco Liserre, Mönkeberg (DE)
Assigned to CHRISTIAN-ALBRECHTS-UNIVERSITÄT ZU KIEL, Kiel (DE)
Appl. No. 17/642,026
Filed by CHRISTIAN-ALBRECHTS-UNIVERSITÄT ZU KIEL, Kiel (DE)
PCT Filed Sep. 11, 2020, PCT No. PCT/EP2020/075426
§ 371(c)(1), (2) Date Jun. 10, 2022,
PCT Pub. No. WO2021/048327, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 10 2019 124 330.0 (DE), filed on Sep. 11, 2019.
Prior Publication US 2024/0048042 A1, Feb. 8, 2024
Int. Cl. H02J 7/00 (2006.01); B60L 53/10 (2019.01); H02M 1/00 (2006.01); H02M 3/24 (2006.01); H02M 5/22 (2006.01); H02M 5/44 (2006.01); H02M 7/483 (2007.01)
CPC H02M 5/225 (2013.01) [B60L 53/10 (2019.02); H02M 1/0067 (2021.05); H02M 3/24 (2013.01); H02M 5/44 (2013.01); H02M 7/4835 (2021.05); B60L 2210/10 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A voltage transformer for converting a primary-side alternating voltage (MVAC) at a first voltage level into a secondary-side alternating voltage (LVAC) at a second voltage level, comprising:
a direct voltage intermediate circuit with a DC-DC voltage converter for converting a first DC voltage generated from a primary-side AC voltage into a second DC voltage,
a decoupling circuit for providing a third DC voltage for connecting at least one load couplable to the DC-DC voltage converter, wherein the DC-DC voltage converter has a plurality of DC-DC converter modules which are either connected directly in series on a primary side or are connected in series by AC-DC converter modules, wherein the DC-DC converter modules each have a transformer and have a primary-side converter cell and a secondary side converter cell, wherein the primary-side converter cell and the secondary side converter cell are coupled to one another by galvanically isolated windings of the transformer, and
a decoupling module coupled to a further winding of the transformer so that the decoupling module is inductively supplied with electrical energy by the transformer,
wherein the decoupling circuit for providing the third DC voltage is connected in series or in parallel respectively by a series connection or parallel connection of the transformer.