US 11,808,821 B2
Method of and system for detecting a serial arc fault in a power circuit
Marcel Kratochvil, Kassel (DE); Raimund Thiel, Bad Zwesten (DE); and Rainer Schmitt, Huenfeld (DE)
Assigned to SMA Solar Technology AG, Niestetal (DE)
Filed by SMA Solar Technology AG, Niestetal (DE)
Filed on Nov. 18, 2022, as Appl. No. 17/989,743.
Application 17/989,743 is a continuation of application No. 17/375,448, filed on Jul. 14, 2021, granted, now 11,567,142.
Application 17/375,448 is a continuation of application No. 16/711,578, filed on Dec. 12, 2019, granted, now 11,067,638.
Prior Publication US 2023/0078605 A1, Mar. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01R 31/40 (2020.01); H02H 1/00 (2006.01)
CPC G01R 31/40 (2013.01) [H02H 1/0015 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of detecting a serial arc fault in a DC-power circuit, the method comprising:
a) injecting, using an injection circuit, an RF-signal into the DC-power circuit;
b) obtaining a response signal related to the injected RF-signal in the DC-power circuit using an outcoupling circuit; and
c) determining, using a control circuit, an occurrence of a serial arc fault in the DC-power circuit depending on the response signal.