US 11,984,812 B2
Dual active bridge converter cell with split energy transfer inductor for optimized current balancing in the medium frequency transformer (MFT)
Uwe Drofenik, Zürich (CH); Thomas Gradinger, Aarau Rohr (CH); and Francisco Canales, Baden-Dättwil (CH)
Assigned to HITACHI ENERGY LTD, Zürich (CH)
Appl. No. 17/631,457
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed Sep. 18, 2020, PCT No. PCT/EP2020/076070
§ 371(c)(1), (2) Date Jan. 29, 2022,
PCT Pub. No. WO2021/053128, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 19198718 (EP), filed on Sep. 20, 2019.
Prior Publication US 2022/0278624 A1, Sep. 1, 2022
Int. Cl. H02M 3/335 (2006.01); H02M 3/00 (2006.01); H02M 3/337 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/33584 (2013.01) [H02M 3/01 (2021.05); H02M 3/33571 (2021.05); H02M 3/33573 (2021.05); H02M 3/337 (2013.01); H02M 1/0085 (2021.05)] 20 Claims
OG exemplary drawing
 
1. A dual active bridge DC/DC converter, comprising:
a first DC link;
a first plurality of N converter bridges connected to the first DC link, N being an integer;
a transformer having a primary side and a secondary side;
the primary side of the transformer comprising a second plurality of M primary windings, M being an integer, each of the second plurality of M primary windings having a first terminal and a second terminal; and
a first plurality of N first energy transfer inductors connected at a common node,
a second energy transfer inductor being connected between said common node and the plurality of converter bridges, and
each first terminal of the M primary windings being connected to the common node via a second plurality of energy transfer inductors and wherein each second terminal of the M primary windings are connected together.