US 11,916,375 B2
Fault current limiter for energy storage systems
Ruben Otero-De-Leon, Raleigh, NC (US); Joaquin Aguerre, Raleigh, NC (US); Bryan Daniels, Willow Springs, NC (US); and Marshall Worth, Raleigh, NC (US)
Assigned to PowerSecure, Inc., Durham, NC (US)
Filed by PowerSecure, Inc., Wake Forest, NC (US)
Filed on Nov. 19, 2019, as Appl. No. 16/688,167.
Claims priority of provisional application 62/769,554, filed on Nov. 19, 2018.
Prior Publication US 2020/0161853 A1, May 21, 2020
Int. Cl. H02H 9/02 (2006.01); G01R 33/07 (2006.01)
CPC H02H 9/025 (2013.01) [G01R 33/07 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An electrical device, comprising:
an input voltage node configured to receive a first voltage signal from an energy source;
an input reference node configured to receive a reference signal from the energy source;
a first switch coupled between the input voltage node and an output voltage node;
a second switch coupled between the input reference node and an output reference node; and
a current sensor circuit coupled to the output voltage node and coupled respectively to the first switch and the second switch, the current sensor circuit configured to open the first and second switches in response to sensing a magnetic field caused by a current signal at the output voltage node that exceeds a threshold current, the opening within six microseconds of the sensing.