US 12,407,159 B2
DC solid state circuit breaker and DC circuit breaker system
Javier Villegas Nunez, Seville (ES); Ricardo Medina Gracia, Seville (ES); Pablo Arévalo Aguilar, Seville (ES); and Sergio Hurtado Cuerva, Seville (ES)
Assigned to HITACHI ENERGY POWER CONVERSION SOLUTIONS SOCIEDAD LIMITADA, Seville (ES)
Appl. No. 18/247,719
Filed by HITACHI ENERGY POWER CONVERSION SOLUTIONS SOCIEDAD LIMITADA, Seville (ES)
PCT Filed Sep. 7, 2021, PCT No. PCT/EP2021/074557
§ 371(c)(1), (2) Date Apr. 3, 2023,
PCT Pub. No. WO2023/011739, PCT Pub. Date Feb. 9, 2023.
Claims priority of application No. 202130767 (ES), filed on Aug. 6, 2021.
Prior Publication US 2023/0411949 A1, Dec. 21, 2023
Int. Cl. H02H 3/087 (2006.01); H02H 3/02 (2006.01)
CPC H02H 3/087 (2013.01) [H02H 3/021 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A DC solid-state circuit breaker (30), comprising:
a first power terminal (31) and a second power terminal (32) connectable in series to terminals of a same first polarity of a DC source (10) and a DC load (20);
a third power terminal (33) connectable to a terminal of a second polarity, opposite to the first polarity, or to an intermediate voltage of the DC source (10);
a power module (40) connected between the first (31) and second (32) power terminals, the power module (40) comprising a first controlled semiconductor (41) configured to interrupt the current flow;
an intermediate node (34);
a DC-Link (50) comprising at least one capacitor (51), wherein the DC-Link (50) is connected between the first power terminal (31) and the intermediate node (34);
a fault current module (60) comprising a semiconductor (61) configured to constrain the current flow to only one direction, wherein the fault current module (60) is connected between the second power terminal (32) and the intermediate node (34); and
a pre-charging system (70) connected between the third power terminal (33) and the intermediate node (34), wherein the pre-charging system (70) comprises a pre-charging impedance (71) through which the at least one capacitor (51) of the DC-Link (50) is pre-charged, wherein the pre-charging system (70) further comprises a first contactor (72) connected between the intermediate node (34) and the third power terminal (33) and in parallel with the pre-charging impedance (71).