US 11,984,881 B2
Thyristor circuit and thyristor protection method
Raeto Stadler, Langnau am Albis (CH); and Ralf Baechle, Weilheim (DE)
Assigned to ABB Schweiz AG, Baden (CH)
Appl. No. 17/610,363
Filed by ABB Schweiz AG, Baden (CH)
PCT Filed May 8, 2020, PCT No. PCT/EP2020/062940
§ 371(c)(1), (2) Date Nov. 10, 2021,
PCT Pub. No. WO2020/229366, PCT Pub. Date Nov. 19, 2020.
Claims priority of application No. 19173822 (EP), filed on May 10, 2019.
Prior Publication US 2022/0224324 A1, Jul. 14, 2022
Int. Cl. H03K 17/082 (2006.01); H03K 17/14 (2006.01); H03K 17/08 (2006.01)
CPC H03K 17/0824 (2013.01) [H03K 17/14 (2013.01); H03K 2017/0806 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A thyristor circuit, comprising:
at least one branch comprising at least one thyristor;
a thyristor control circuit for selectively triggering the thyristor; and
a current detector configured to detect a current value representative of an electrical current flowing through the thyristor and to input the detected current value into the thyristor control circuit,
wherein the thyristor control circuit is configured to determine a fault condition in which the detected current value exceeds a predetermined current threshold based on a deteriorated blocking ability of the thyristor, and, dependent on the determination result, to trigger the thyristor into a conductive state.