US 12,304,325 B2
Power system controller failsafe cycling protection
Evelyn M. Matheson, Bothell, WA (US); and Daniel D. Church, Snohomish, WA (US)
Assigned to The Boeing Company, Arlington, VA (US)
Filed by The Boeing Company, Chicago, IL (US)
Filed on Aug. 11, 2021, as Appl. No. 17/399,757.
Claims priority of provisional application 63/064,397, filed on Aug. 11, 2020.
Prior Publication US 2022/0048393 A1, Feb. 17, 2022
Int. Cl. B60L 3/00 (2019.01); B60L 3/04 (2006.01); B64D 31/00 (2006.01)
CPC B60L 3/04 (2013.01) [B64D 31/00 (2013.01); B60L 2200/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for failsafe cycling protection, the system comprising:
an aircraft electrical power system controller comprising a computer-readable medium storing instructions that are operative upon execution by a processor to:
switch from an operating state to a failsafe state responsive to detection of output voltage from a low voltage power source of the aircraft electrical power system controller outside an acceptable voltage threshold range including a minimum threshold and a maximum threshold, wherein the low voltage power source is to receive a low voltage direct current and create one or more lower level voltages to supply various circuitry, wherein the output voltage outside the acceptable voltage threshold range is to indicate both of an undervoltage or an overvoltage, and wherein if the output voltage falls below the minimum threshold an undervoltage is to be indicated, and if the output voltage exceeds the maximum threshold an overvoltage is to be indicated;
inhibit the aircraft electrical power system controller returning to the operating state from the failsafe state at power up responsive to detection of a failsafe cycling protection enabled, wherein the failsafe cycling protection assumes an intermittent failure in the low voltage power source; and
enable the aircraft electrical power system controller to return to the operating state from the failsafe state responsive to a manual activation of a control switch on a flight deck or detection of a set of generator control breakers in an open configuration.