US 12,235,718 B2
Circuit interrupt device fault duration monitor
Collin Richard Fischels, Independence, IA (US); Juan Ignacio Melecio Ramirez, North Liberty, IA (US); Adrian Abdala Rendon Hernandez, Tiffin, IA (US); and Kenneth Riehl, Solon, IA (US)
Assigned to Schneider Electric USA, Inc., Boston, MA (US)
Filed by Schneider Electric USA, Inc., Andover, MA (US)
Filed on Jul. 27, 2023, as Appl. No. 18/227,232.
Prior Publication US 2025/0036505 A1, Jan. 30, 2025
Int. Cl. G06F 11/07 (2006.01); G06F 11/32 (2006.01)
CPC G06F 11/0772 (2013.01) [G06F 11/076 (2013.01); G06F 11/322 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A circuit interrupt protective device, comprising:
a central processing unit (CPU);
a sensor circuit connected to the CPU and configured to sense a current or a voltage waveform in the circuit interrupt protective device, the current or voltage waveform originating from an AC mains;
an analog-to-digital converter (ADC) coupled to the CPU and configured to acquire the current or voltage waveform sensed by the sensor circuit;
a fault detection module coupled to the ADC and configured to receive the current or voltage waveform acquired by the ADC, the fault detection module operable to detect a fault event based on the current or voltage waveform; and
a fault duration module coupled to the ADC and configured to receive the current or voltage waveform acquired by the ADC, the fault duration module operable to obtain a duration of the fault event based on the current or voltage waveform;
wherein the duration of the fault event is obtained by computing a second derivative for a portion of the current or voltage waveform, finding a local maximum or local minimum for the portion of the current or voltage waveform, and setting the local maximum or the local minimum as a starting time or an ending time for the duration of the fault event.