US 12,412,721 B2
Solid-state circuit breaker and its self-test method
Feng Lu, Beijing (CN); Haijun Zhao, Beijing (CN); Jiamin Chen, Beijing (CN); and Jialu Bai, Beijing (CN)
Assigned to Schneider Electric (China) Co., Ltd., Beijing (CN)
Filed by Schneider Electric (China) Co., Ltd., Beijing (CN)
Filed on Dec. 4, 2023, as Appl. No. 18/527,942.
Claims priority of application No. 202311262309.3 (CN), filed on Sep. 27, 2023.
Prior Publication US 2025/0104954 A1, Mar. 27, 2025
Int. Cl. H02H 3/00 (2006.01); G01R 31/327 (2006.01); H01H 83/04 (2006.01); H02H 1/00 (2006.01); H02H 3/04 (2006.01); H02H 9/08 (2006.01)
CPC H01H 83/04 (2013.01) [G01R 31/3275 (2013.01); H02H 1/0007 (2013.01); H02H 3/044 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A solid-state circuit breaker, comprising:
an input end and an output end, the input end being adapted to be connected to a mechanical switch;
a first switching device connected between the input end and a first node;
a second switching device connected between the first node and the output end;
a third switching device and a first resistive element connected in series between the input end and the output end;
an auxiliary power branch connected between the first node and a second node;
an anti-reverse connection circuit connected between the second node and the input end and between the second node and the output end, and configured to allow a current to flow unidirectionally from the second node to the input end and the output end;
a first current sensor configured to sense a current flowing through the second switching device and generate a first current signal;
a second current sensor configured to sense a current flowing through the auxiliary power branch and generate a second current signal; and
a control unit configured to determine operation states of the first switching device and the second switching device based on the first current signal and the second current signal.