US 12,155,194 B2
Method and device for connecting a capacitive load assembly to a DC grid
Klaus Behringer, Igensdorf (DE); Wolfgang Feil, Schwandorf (DE); Peter Kaluza, Rieden (DE); and Matthias Meier, Poppenricht (DE)
Assigned to Siemens Aktiengesellschaft, Munich (DE)
Appl. No. 17/611,727
Filed by Siemens Aktiengesellschaft, Munich (DE)
PCT Filed May 15, 2020, PCT No. PCT/EP2020/063568
§ 371(c)(1), (2) Date Nov. 16, 2021,
PCT Pub. No. WO2020/234134, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 19175084 (EP), filed on May 17, 2019.
Prior Publication US 2022/0239091 A1, Jul. 28, 2022
Int. Cl. H02H 3/087 (2006.01); H02H 3/027 (2006.01); H02H 9/00 (2006.01); H02J 7/34 (2006.01)
CPC H02H 3/087 (2013.01) [H02H 3/027 (2013.01); H02H 9/001 (2013.01); H02J 7/345 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for connecting a capacitive load assembly to a DC grid, the load assembly being connectable to a supply potential of the DC grid by a controller via a controllable switching element, the method comprising:
periodically switching, via the controller, the controllable switching element on and off;
detecting, via a current measurement device, a level of current pulses flowing through the controllable switching element during a respective switch-on phase of the controllable switching element;
evaluating, via the controller, development of the level of at least two immediately successive current pulses over time; and
additionally periodically switching the controllable switching element on and off, via the controller, in response to a difference of the level of the at least two immediately successive current pulses exceeding a threshold.