US 12,445,068 B2
Control device for an inverter, electric drive system and method for establishing a safe operating mode
Edwin Eberlein, Stuttgart (DE); Daniel Raichle, Vaihingen (DE); Manfred Kirschner, Stuttgart (DE); Thomas Merkel, Sachsenheim-Hohenhaslach (DE); Thomas Knorpp, Murr (DE); and Volker Gilgenbach, Schwieberdingen (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/927,396
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Apr. 30, 2021, PCT No. PCT/EP2021/061410
§ 371(c)(1), (2) Date Nov. 23, 2022,
PCT Pub. No. WO2021/239386, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 10 2020 206 478.4 (DE), filed on May 25, 2020.
Prior Publication US 2023/0246570 A1, Aug. 3, 2023
Int. Cl. H02P 6/16 (2016.01); H02H 7/08 (2006.01); H02P 3/22 (2006.01)
CPC H02P 3/22 (2013.01) [H02H 7/08 (2013.01); H02P 6/16 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A control device for an inverter (30) in an electric drive system, the control device comprising:
a first processor (25) and a second processor (25) which are each configured to establish a safe operating mode in a shared inverter (30) connected to both the first processor (25) and the second processor (25),
wherein the first processor (25) is configured to determine a rotational speed of an electric machine (3) of the electric drive system and, using the determined rotational speed of the electric machine (3), to establish, as the safe operating mode, either an active short-circuit or a freewheeling mode in the shared inverter (30);
wherein the second processor (25) is configured to determine the rotational speed of the electric machine (3) of the electric drive system and, using the determined rotational speed of the electric machine (3), to establish, as the safe operating mode, either the active short-circuit or the freewheeling mode in the shared inverter (30), and
wherein the first processor (25) and/or the second processor (25) are configured to establish an active short-circuit in the inverter (30) in response to the determined rotational speed of the electric machine (3) exceeding a first threshold value (n1), and to establish a freewheeling mode in response to the determined rotational speed of the electric machine (3) falling below a second threshold value (n2).