US 11,671,048 B2
Multiphase voltage transformer for a supply network and method for powering down an intermediate circuit voltage of this supply network
Vincent Leonhardt, Haguenau (FR); Jürgen Tipper, Gernsbach (DE); and Huan Fu, Rastatt (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 17/609,478
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Apr. 15, 2020, PCT No. PCT/DE2020/100300
§ 371(c)(1), (2) Date Nov. 8, 2021,
PCT Pub. No. WO2020/224700, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 102019111838.7 (DE), filed on May 7, 2019; and application No. 102019112522.7 (DE), filed on May 14, 2019.
Prior Publication US 2022/0255485 A1, Aug. 11, 2022
Int. Cl. H02P 27/08 (2006.01); B60L 3/00 (2019.01); B60L 3/04 (2006.01)
CPC H02P 27/08 (2013.01) [B60L 3/003 (2013.01); B60L 3/0046 (2013.01); B60L 3/04 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A multiphase voltage transformer for an electrical supply network for supplying an electrical machine with electrical energy from an electrical energy storage system, the electrical supply network comprises the multiphase voltage transformer, an output current converter connected downstream of the multiphase voltage transformer and an intermediate circuit connected between the multiphase voltage transformer and the output current converter, the multiphase voltage transformer comprising:
a circuit arrangement having a plurality of parallel-connected voltage transformer units at an input end, each of said transformer units having an inductance and two semiconductor switches, and a controller for actuating the semiconductor switches,
the controller being configured to actuate the semiconductor switches units in an intermediate circuit discharging operation such that the intermediate circuit voltage of the intermediate circuit is powered down in less than two seconds into a voltage range lower than 60 V DC.