US 12,248,017 B1
Arc fault current health check circuit
Maisam Gulamabbas Pyarali Bandali, Palo Alto, CA (US); and Hai-Yue Han, San Jose, CA (US)
Assigned to Lunar Energy, Inc., Mountain View, CA (US)
Filed by Lunar Energy, Inc., Mountain View, CA (US)
Filed on Jul. 17, 2024, as Appl. No. 18/775,913.
Int. Cl. H02S 50/00 (2014.01); G01R 19/00 (2006.01); G01R 31/28 (2006.01)
CPC G01R 31/2841 (2013.01) [G01R 19/0092 (2013.01); H02S 50/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A power system, comprising:
a current sensor;
an arc fault detection circuit coupled to the current sensor, wherein the arc fault detection circuit is configured to detect a presence of an arc based at least in part on the current sensor;
an AC (alternating current) power source capacitively coupled to the current sensor;
a controller configured to check a health of the arc fault detection circuit at least in part by:
controlling the AC power source to inject an AC signal to the current sensor;
receiving an output of the arc fault detection circuit; and
determining whether a circuit fault in the arc fault detection circuit is present based at least in part on an evaluation of the output of the arc fault detection circuit; and
wherein the arc fault detection circuit further comprises an isolation circuit between the arc fault detection circuit and the controller, wherein the isolation circuit is configured to transform a voltage of the output of the arc fault detection circuit.